T A B L E O F C O N T E N T S |
1.0 | SUMMARY | | 1-1 |
| 1.1 | INTRODUCTION | 1-1 |
| 1.2 | PROPERTY DESCRIPTION AND LOCATION | 1-3 |
| 1.3 | GEOLOGY AND MINERALIZATION | 1-3 |
| 1.4 | RESOURCE ESTIMATE | 1-5 |
| 1.5 | MINERAL PROCESSING AND METALLURGICAL TESTING | 1-6 |
| 1.6 | MINING METHODS | 1-7 |
| 1.7 | RECOVERY METHODS | 1-7 |
| 1.8 | PROJECT INFRASTRUCTURE | 1-8 |
| | 1.8.1 | POWER SUPPLY | 1-10 |
| | 1.8.2 | TAILINGS STORAGE FACILITY | 1-11 |
| 1.9 | ENVIRONMENTAL | 1-11 |
| 1.10 | CAPITAL COSTS (INITIAL AND SUSTAINING) | 1-12 |
| 1.11 | OPERATING COSTS | 1-13 |
| 1.12 | ECONOMIC ANALYSIS | 1-14 |
| 1.13 | INTERPRETATION AND CONCLUSIONS | 1-15 |
| 1.14 | OPPORTUNITIES AND RECOMMENDATIONS | 1-15 |
2.0 | INTRODUCTION | | 2-1 |
| 2.1 | TERMS OF REFERENCE | 2-1 |
| | 2.1.1 | UNITS OF MEASUREMENT | 2-1 |
| 2.2 | QUALIFIED PERSONS | 2-2 |
| 2.3 | SITE VISITS | 2-4 |
| 2.4 | SCOPE OF PERSONAL INSPECTIONS | 2-4 |
| 2.5 | INFORMATION SOURCES | 2-4 |
3.0 | RELIANCE ON OTHER EXPERTS | 3-1 |
| 3.1 | MICHAEL F. O’BRIEN, M.SC., PR.SCI.NAT, FGSSA, FAUSIMM, FSAIMM | 3-1 |
| 3.2 | SABRY ABDEL HAFEZ, PH.D., P.ENG | 3-1 |
4.0 | PROPERTY DESCRIPTION AND LOCATION | 4-1 |
| 4.1 | LOCATION | | 4-1 |
| 4.2 | MINERAL TENURE | 4-4 |
| 4.3 | ROYALTIES, AGREEMENTS AND ENCUMBRANCES | 4-6 |
| | 4.3.1 | KENNECOTT AGREEMENTS | 4-6 |
| | 4.3.2 | NANA AGREEMENT | 4-6 |
| 4.4 | ENVIRONMENTAL LIABILITIES | 4-8 |
iv
| |
| 4.5 | PERMITS | | 4-8 |
| | | | |
5.0 | ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY | 5-1 |
| | | | |
| 5.1 | ACCESSIBILITY | 5-1 |
| | 5.1.1 | AIR | 5-1 |
| | 5.1.2 | WATER | 5-1 |
| | 5.1.3 | ROAD | 5-1 |
| 5.2 | CLIMATE | | 5-1 |
| 5.3 | LOCAL RESOURCES | 5-2 |
| 5.4 | INFRASTRUCTURE | 5-3 |
| 5.5 | PHYSIOGRAPHY | 5-3 |
| | | | |
6.0 | HISTORY | | 6-1 |
| | | | |
| 6.1 | PRIOR OWNERSHIP AND OWNERSHIP CHANGES – ARCTIC DEPOSIT AND THE AMBLER LANDS |
| | | | 6-2 |
| 6.2 | PREVIOUS EXPLORATION AND DEVELOPMENT RESULTS – ARCTIC DEPOSIT | 6-3 |
| | 6.2.1 | INTRODUCTION | 6-3 |
| | 6.2.2 | GEOCHEMISTRY | 6-8 |
| | 6.2.3 | GEOPHYSICS | 6-8 |
| | 6.2.4 | DRILLING | 6-9 |
| | 6.2.5 | SPECIFIC GRAVITY | 6-9 |
| | 6.2.6 | PETROLOGY, MINERALOGY, AND RESEARCH STUDIES | 6-9 |
| | 6.2.7 | GEOTECHNICAL, HYDROLOGICAL AND ACID-BASE ACCOUNTING STUDIES | 6-10 |
| | 6.2.8 | METALLURGICAL STUDIES | 6-11 |
| 6.3 | HISTORICAL MINERAL RESOURCE ESTIMATES | 6-11 |
| | 6.3.1 | RUSSELL – KENNECOTT (1975/1976) RESOURCE ESTIMATE | 6-11 |
| | 6.3.2 | BROWN – KENNECOTT (1985) RESOURCE ESTIMATE | 6-11 |
| | 6.3.3 | RANDOLF – KENNECOTT (1990) RESOURCE ESTIMATE | 6-12 |
| | 6.3.4 | KENNECOTT (1995) RESOURCE ESTIMATE | 6-12 |
| | 6.3.5 | DEAD CREEK, SUNSHINE AND HORSE CLIFF HISTORICAL RESOURCES | 6-13 |
| 6.4 | DEVELOPMENT STUDIES | 6-13 |
| | 6.4.1 | KENNECOTT TENURE | 6-13 |
| | | | |
7.0 | GEOLOGICAL SETTING AND MINERALIZATION | 7-1 |
| | | | |
| 7.1 | REGIONAL GEOLOGY – SOUTHERN BROOKS RANGE | 7-1 |
| | 7.1.1 | TERRANE DESCRIPTIONS | 7-1 |
| | 7.1.2 | REGIONAL TECTONIC SETTING | 7-3 |
| 7.2 | AMBLER SEQUENCE GEOLOGY | 7-4 |
| | 7.2.1 | GENERAL STRATIGRAPHY OF THE AMBLER SEQUENCE | 7-5 |
| | 7.2.2 | STRUCTURAL FRAMEWORK OF THE AMBLER DISTRICT | 7-9 |
| 7.3 | ARCTIC DEPOSIT GEOLOGY | 7-10 |
| | 7.3.1 | LITHOLOGIES AND LITHOLOGIC DOMAIN DESCRIPTIONS | 7-11 |
| | 7.3.2 | STRUCTURE | 7-13 |
| | 7.3.3 | ALTERATION | 7-14 |
| 7.4 | ARCTIC DEPOSIT MINERALIZATION | 7-15 |
| 7.5 | GENESIS | | 7-16 |
v
| |
| 7.6 | DEPOSITS AND PROSPECTS | 7-17 |
8.0 | DEPOSIT TYPES | 8-1 |
9.0 | EXPLORATION | | 9-1 |
| 9.1 | GRIDS AND SURVEYS | 9-2 |
| 9.2 | GEOLOGICAL MAPPING | 9-2 |
| 9.3 | GEOCHEMISTRY | 9-4 |
| 9.4 | GEOPHYSICS | 9-7 |
| 9.5 | BULK DENSITY | 9-9 |
| 9.6 | PETROLOGY, MINERALOGY AND RESEARCH STUDIES | 9-9 |
| 9.7 | GEOTECHNICAL, HYDROGEOLOGICAL AND ACID BASE ACCOUNTING STUDIES | 9-9 |
| | 9.7.1 | GEOTECHNICAL STUDIES | 9-9 |
| | 9.7.2 | HYDROLOGICAL STUDIES | 9-9 |
| | 9.7.3 | ACID-BASE ACCOUNTING STUDIES | 9-10 |
| | 9.7.4 | METALLURGICAL STUDIES | 9-11 |
10.0 | DRILLING | | 10-1 |
| 10.1 | DRILL COMPANIES | 10-5 |
| 10.2 | DRILL CORE PROCEDURES | 10-6 |
| | 10.2.1 | KENNECOTT TENURE | 10-6 |
| | 10.2.2 | NOVAGOLD/NOVACOPPER TENURE | 10-6 |
| 10.3 | GEOTECHNICAL DRILL HOLE PROCEDURES | 10-7 |
| 10.4 | METALLURGICAL DRILL HOLE PROCEDURES | 10-8 |
| 10.5 | COLLAR SURVEYS | 10-9 |
| | 10.5.1 | KENNECOTT TENURE | 10-9 |
| | 10.5.2 | NOVAGOLD/NOVACOPPER TENURE | 10-9 |
| 10.6 | DOWNHOLE SURVEYS | 10-9 |
| 10.7 | RECOVERY | | 10-10 |
| 10.8 | DRILL INTERCEPTS | 10-10 |
| 10.9 | DRILLING AT OTHER PROSPECTS | 10-11 |
11.0 | SAMPLE PREPARATION, ANALYSES, AND SECURITY | 11-1 |
| 11.1 | SAMPLE PREPARATION | 11-1 |
| | 11.1.1 | CORE DRILLING SAMPLING | 11-1 |
| | 11.1.2 | ACID-BASE ACCOUNTING SAMPLING | 11-3 |
| | 11.1.3 | DENSITY DETERMINATIONS | 11-3 |
| 11.2 | SECURITY | | 11-4 |
| 11.3 | ASSAYING AND ANALYTICAL PROCEDURES | 11-4 |
| 11.4 | QUALITY ASSURANCE/QUALITY CONTROL | 11-5 |
| | 11.4.1 | CORE DRILLING SAMPLING QA/QC | 11-5 |
| | 11.4.2 | ACID-BASE ACCOUNTING SAMPLING QA/QC | 11-12 |
| | 11.4.3 | DENSITY DETERMINATIONS QA/QC | 11-12 |
| 11.5 | AUTHOR’S OPINION | 11-15 |
12.0 | DATA VERIFICATION | 12-1 |
vi
| |
| 12.1 | DRILL HOLE COLLAR VERIFICATION | 12-1 |
| 12.2 | TOPOGRAPHY VERIFICATION | 12-1 |
| 12.3 | CORE LOGGING VERIFICATION | 12-2 |
| 12.4 | DATABASE VERIFICATION | 12-2 |
| 12.5 | QA/QC REVIEW | 12-3 |
| 12.6 | QP OPINION | 12-4 |
13.0 | MINERAL PROCESSING AND METALLURGICAL TESTING | 13-1 |
| 13.1 | METALLURGICAL TEST WORK REVIEW | 13-1 |
| | 13.1.1 | INTRODUCTION | 13-1 |
| | 13.1.2 | MINERALOGICAL AND METALLURGICAL TEST WORK – SGS 2012 | 13-1 |
| | 13.1.3 | HISTORICAL TEST WORK REVIEW | 13-14 |
| 13.2 | RECOMMENDED TEST WORK | 13-19 |
14.0 | MINERAL RESOURCE ESTIMATES | 14-1 |
| 14.1 | INTRODUCTION | 14-1 |
| 14.2 | PREVIOUS RESOURCE ESTIMATES | 14-2 |
| | 14.2.1 | KENNECOTT (1990) RESOURCE ESTIMATE | 14-2 |
| | 14.2.2 | SRK (2008) RESOURCE ESTIMATION | 14-2 |
| | 14.2.3 | SRK (2011) RESOURCE ESTIMATION UPDATE | 14-5 |
| | 14.2.4 | SRK (2012) RESOURCE ESTIMATION UPDATE | 14-6 |
| 14.3 | RESOURCE ESTIMATION PROCEDURES | 14-7 |
| 14.4 | DATABASE | | 14-7 |
| 14.5 | GEOLOGICAL MODELLING | 14-8 |
| | 14.5.1 | MINERALIZATION MODEL | 14-8 |
| | 14.5.2 | SPECIFIC GRAVITY MODEL | 14-8 |
| | 14.5.3 | LITHOGEOCHEMICAL MODEL | 14-8 |
| | 14.5.4 | ESTIMATION DOMAINS | 14-9 |
| 14.6 | EXPLORATORY DATA ANALYSIS | 14-11 |
| | 14.6.1 | CONTACT PROFILES | 14-11 |
| | 14.6.2 | RAW ASSAY DATA AND STATISTICS | 14-12 |
| 14.7 | COMPOSITING | 14-13 |
| | 14.7.1 | OUTLIER MANAGEMENT AND CAPPING STRATEGY | 14-13 |
| | 14.7.2 | COMPOSITE STATISTICS | 14-15 |
| 14.8 | SPECIFIC GRAVITY ANALYSIS | 14-16 |
| | 14.8.1 | SPECIFIC GRAVITY STATISTICS AND SPATIAL ANALYSIS | 14-16 |
| | 14.8.2 | SPECIFIC GRAVITY INTERPOLATION PLAN | 14-16 |
| 14.9 | ACID BASE ACCOUNTING ANALYSIS | 14-17 |
| 14.10 | VARIOGRAPHY AND SPATIAL ANALYSIS | 14-18 |
| 14.11 | RESOURCE ESTIMATION METHODOLOGY | 14-20 |
| 14.12 | RESOURCE BLOCK MODEL | 14-22 |
| | 14.12.1 | CONFIGURATION | 14-22 |
| | 14.12.2 | CELL ATTRIBUTES | 14-22 |
| 14.13 | MODEL VALIDATION | 14-25 |
| | 14.13.1 | VISUAL VALIDATION | 14-25 |
vii
| |
| | 14.13.2 | STATISTICAL COMPARISONS BETWEEN BLOCK AND COMPOSITE DATA | 14-28 |
| 14.14 | MINERAL RESOURCE CLASSIFICATION | 14-37 |
| | 14.14.1 | MEASURED RESOURCE CLASSIFICATION | 14-38 |
| | 14.14.2 | INDICATED RESOURCE CLASSIFICATION | 14-38 |
| | 14.14.3 | INFERRED RESOURCE CLASSIFICATION | 14-38 |
| 14.15 | MINERAL RESOURCE ESTIMATE | 14-38 |
| 14.16 | GRADE SENSITIVITY ANALYSIS | 14-40 |
| | | | |
15.0 | MINERAL RESERVE ESTIMATES | 15-1 |
| | | | |
16.0 | MINING METHODS | 16-1 |
| | | | |
| 16.1 | INTRODUCTION | 16-1 |
| 16.2 | PIT OPTIMIZATION | 16-1 |
| | 16.2.1 | BLOCK MODEL | 16-1 |
| | 16.2.2 | PIT SLOPE ANGLE | 16-1 |
| | 16.2.3 | SURFACE TOPOGRAPHY | 16-1 |
| | 16.2.4 | PIT OPTIMIZATION PARAMETERS | 16-1 |
| | 16.2.5 | PIT OPTIMIZATION RESULTS | 16-5 |
| 16.3 | MINE DESIGN | 16-7 |
| | 16.3.1 | BENCH HEIGHT AND PIT WALL SLOPE | 16-7 |
| | 16.3.2 | MINIMUM WORKING AREA | 16-8 |
| | 16.3.3 | HAUL ROAD | 16-8 |
| | 16.3.4 | PIT HYDROLOGY/DEWATERING | 16-9 |
| | 16.3.5 | PIT DESIGN RESULTS | 16-9 |
| 16.4 | PRODUCTION SCHEDULE | 16-10 |
| 16.5 | MINE WASTE ROCK MANAGEMENT | 16-18 |
| 16.6 | MINING EQUIPMENT | 16-18 |
| | 16.6.1 | MINE EQUIPMENT FLEET | 16-18 |
| | 16.6.2 | OPERATING HOURS | 16-18 |
| | 16.6.3 | PRIMARY EQUIPMENT | 16-18 |
| | 16.6.4 | SUPPORT AND ANCILLARY EQUIPMENT | 16-19 |
| 16.7 | MINING LABOUR | 16-20 |
| | | | |
17.0 | RECOVERY METHODS | 17-1 |
| | | | |
| 17.1 | MINERAL PROCESSING | 17-1 |
| | 17.1.1 | FLOWSHEET DEVELOPMENT | 17-1 |
| | 17.1.2 | PROCESS PLANT DESCRIPTION | 17-4 |
| | 17.1.3 | COARSE MATERIAL STORAGE | 17-5 |
| | 17.1.4 | GRINDING AND CLASSIFICATION | 17-5 |
| | 17.1.5 | FLOTATION | 17-6 |
| 17.2 | PLANT PROCESS CONTROL | 17-15 |
| | 17.2.1 | OVERVIEW | 17-15 |
| | 17.2.2 | PRODUCTION PROJECTION | 17-16 |
| | | | |
18.0 | PROJECT INFRASTRUCTURE | 18-1 |
| | | | |
| 18.1 | OVERVIEW | | 18-1 |
| 18.2 | ROADS AND AIRSTRIP | 18-4 |
viii
| |
| | 18.2.1 | AMBLER MINING DISTRICT INDUSTRIAL ACCESS ROAD | 18-4 |
| | 18.2.2 | ACCESS ROAD | 18-4 |
| | 18.2.3 | HAUL ROADS, SITE ROADS, AND PAD AREAS | 18-5 |
| | 18.2.4 | AIRSTRIP | 18-6 |
| 18.3 | BUILDINGS AND RELEVANT BUILDING SERVICES | 18-7 |
| | 18.3.1 | PRIMARY CRUSHING BUILDING | 18-7 |
| | 18.3.2 | CRUSHED MATERIAL STOCKPILE | 18-7 |
| | 18.3.3 | CONVEYING | 18-7 |
| | 18.3.4 | MILL BUILDING, MAINTENANCE, TRUCK SHOP, ASSAY AND METALLURGY LAB18-7 |
| | 18.3.5 | ADMINISTRATION AND MINE DRY | 18-8 |
| | 18.3.6 | ARCTIC CORRIDORS | 18-8 |
| | 18.3.7 | COLD STORAGE WAREHOUSE | 18-8 |
| | 18.3.8 | HVAC AND FIRE PROTECTION | 18-8 |
| | 18.3.9 | FIRE PROTECTION | 18-9 |
| | 18.3.10 | DUST CONTROL | 18-9 |
| 18.4 | WATER SUPPLY AND DISTRIBUTION | 18-9 |
| 18.5 | WASTE MANAGEMENT | 18-10 |
| | 18.5.1 | SEWAGE DISPOSAL | 18-10 |
| | 18.5.2 | DOMESTIC WASTE DISPOSAL | 18-10 |
| 18.6 | FUEL STORAGE | 18-10 |
| 18.7 | ON SITE EXPLOSIVES STORAGE | 18-11 |
| | 18.7.1 | EMULSION PLANT | 18-11 |
| | 18.7.2 | DETONATOR AND EXPLOSIVE STORAGE MAGAZINE | 18-11 |
| 18.8 | POWER SUPPLY TO PLANT SITE | 18-11 |
| 18.9 | TAILINGS STORAGE FACILITY | 18-11 |
| | 18.9.1 | TSF EMBANKMENT | 18-12 |
| | 18.9.2 | TAILINGS IMPOUNDMENT | 18-13 |
| | 18.9.3 | RECLAIM WATER SYSTEM | 18-13 |
| | 18.9.4 | SEEPAGE COLLECTION SUMP | 18-14 |
| 18.10 | WASTE ROCK FACILITIES | 18-14 |
| | 18.10.1 | NON-ACID GENERATING WASTE ROCK | 18-14 |
| | 18.10.2 | POTENTIALLY ACID GENERATING WASTE ROCK | 18-14 |
| 18.11 | WATER MANAGEMENT | 18-14 |
| | 18.11.1 | SITE FACILITIES | 18-16 |
| 18.12 | WATER TREATMENT PLANT | 18-18 |
| 18.13 | CONSTRUCTION AND PERMANENT CAMP ACCOMMODATION | 18-18 |
| 18.14 | COMMUNICATIONS | 18-18 |
| | | | |
19.0 | MARKET STUDIES AND CONTRACTS | 19-1 |
| | | | |
20.0 | ENVIRONMENTAL STUDIES, PERMITTING, AND SOCIAL OR COMMUNITY IMPACT | 20-1 |
| | | | |
| 20.1 | ENVIRONMENTAL STUDIES | 20-1 |
| | 20.1.1 | HYDROLOGY AND WATER QUALITY DATA | 20-1 |
| | 20.1.2 | WETLANDS DATA | 20-2 |
| | 20.1.3 | AQUATIC LIFE DATA | 20-2 |
| | 20.1.4 | SUBSISTENCE DATA | 20-4 |
ix
| |
| | 20.1.5 | ACID BASE ACCOUNTING DATA | 20-5 |
| | 20.1.6 | ADDITIONAL BASELINE DATA REQUIREMENTS | 20-6 |
| 20.2 | PERMITTING | 20-6 |
| | 20.2.1 | EXPLORATION PERMITS | 20-6 |
| | 20.2.2 | MAJOR MINE PERMITS | 20-7 |
| 20.3 | SOCIAL OR COMMUNITY CONSIDERATIONS | 20-9 |
| 20.4 | MINE RECLAMATION AND CLOSURE | 20-10 |
| | 20.4.1 | RECLAMATION AND CLOSURE PLAN | 20-11 |
| | 20.4.2 | RECLAMATION AND CLOSURE FINANCIAL ASSURANCE | 20-12 |
| | | | |
21.0 | CAPITAL AND OPERATING COSTS | 21-1 |
| | | | |
| 21.1 | INTRODUCTION | 21-1 |
| 21.2 | CAPITAL COST ESTIMATE | 21-1 |
| | 21.2.1 | INTRODUCTION | 21-1 |
| | 21.2.2 | CAPITAL COST SUMMARY | 21-1 |
| | 21.2.3 | TOTAL SUSTAINING CAPITAL COSTS | 21-1 |
| | 21.2.4 | PURPOSE AND CLASS OF ESTIMATE | 21-2 |
| | 21.2.5 | ESTIMATE BASE DATE, EXCHANGE RATE, AND VALIDITY PERIOD | 21-2 |
| | 21.2.6 | CONTRIBUTORS TO THE ESTIMATE | 21-3 |
| 21.3 | ELEMENTS OF COST | 21-3 |
| | 21.3.1 | DIRECT COSTS | 21-3 |
| | 21.3.2 | INDIRECT COSTS | 21-4 |
| | 21.3.3 | OWNER’S COSTS | 21-4 |
| | 21.3.4 | CONTINGENCIES | 21-5 |
| | 21.3.5 | EXCLUSIONS | 21-5 |
| | 21.3.6 | COSTS INCURRED PRIOR TO RELEASE OF DETAIL ENGINEERING AND CONSTRUCTION |
| | | ASSUMPTIONS | 21-5 |
| 21.4 | MINING CAPITAL COST ESTIMATE | 21-6 |
| 21.5 | OPERATING COST ESTIMATE | 21-9 |
| | 21.5.1 | SUMMARY | 21-9 |
| | 21.5.2 | MINING OPERATING COST ESTIMATE | 21-10 |
| | 21.5.3 | PROCESSING OPERATING COSTS | 21-11 |
| | 21.5.4 | GENERAL AND ADMINISTRATIVE COSTS AND SURFACE SERVICES COSTS | 21-13 |
| | 21.5.5 | TAILINGS STORAGE FACILITY COST | 21-15 |
| | 21.5.6 | ROAD TOLL COST | 21-15 |
| | | | |
22.0 | ECONOMIC ANALYSIS | 22-1 |
| | | | |
| 22.1 | PRE-TAX MODEL | 22-2 |
| | 22.1.1 | MINE/METAL PRODUCTION IN FINANCIAL MODEL | 22-2 |
| | 22.1.2 | BASIS OF FINANCIAL EVALUATION | 22-2 |
| 22.2 | SUMMARY OF FINANCIAL RESULTS | 22-4 |
| 22.3 | SENSITIVITY ANALYSIS | 22-5 |
| 22.4 | POST-TAX FINANCIAL ANALYSIS | 22-7 |
| | 22.4.1 | US FEDERAL TAX | 22-7 |
| | 22.4.2 | ALASKA STATE TAX | 22-8 |
| | 22.4.3 | ALASKA MINING LICENSE TAX | 22-8 |
| | 22.4.4 | TAXES AND POST-TAX RESULTS | 22-8 |
x
| |
| 22.5 | ROYALTIES | 22-9 |
| 22.6 | SMELTER TERMS | 22-10 |
| 22.7 | TRANSPORTATION LOGISTICS | 22-11 |
| 22.8 | INSURANCE | 22-11 |
| 22.9 | REPRESENTATION AND MARKETING | 22-11 |
23.0 | ADJACENT PROPERTIES | 23-1 |
| 23.1 | SUN DEPOSIT | 23-1 |
| 23.2 | SMUCKER DEPOSIT | 23-3 |
24.0 | OTHER RELEVANT DATA AND INFORMATION | 24-1 |
| 24.1 | BORNITE DEPOSIT | 24-1 |
25.0 | INTERPRETATION AND CONCLUSIONS | 25-1 |
| 25.1 | GENERAL | 25-1 |
| 25.2 | PROPERTY DESCRIPTION AND LOCATION | 25-1 |
| 25.3 | GEOLOGY | 25-1 |
| 25.4 | MINERAL RESOURCE ESTIMATION | 25-2 |
| 25.5 | METALLURGICAL TEST WORK AND PROCESS DESIGN | 25-2 |
| 25.6 | MINING METHODS | 25-4 |
| 25.7 | PROJECT INFRASTRUCTURE | 25-4 |
| 25.8 | TAILINGS AND WATER MANAGEMENT | 25-5 |
| 25.9 | ENVIRONMENTAL STUDIES, PERMITTING, AND SOCIAL OR COMMUNITY IMPACT | 25-5 |
| 25.10 | ECONOMIC ANALYSIS | 25-5 |
26.0 | RECOMMENDATIONS | 26-1 |
| 26.1 | GENERAL | 26-1 |
| 26.2 | GEOLOGY | 26-1 |
| 26.3 | MINERAL PROCESSING AND METALLURGICAL TESTING | 26-2 |
| 26.4 | PROCESS PLANT DESIGN | 26-2 |
| 26.5 | MINING METHODS | 26-3 |
| 26.6 | PROJECT INFRASTRUCTURE | 26-3 |
| | 26.6.1 | PROCESS PLANT AND INFRASTRUCTURE LOCATION | 26-3 |
| | 26.6.2 | ACCESS ROAD | 26-4 |
| | 26.6.3 | ELECTRICAL POWER GENERATION | 26-4 |
| | 26.6.4 | AIRSTRIP | 26-4 |
| | 26.6.5 | TAILINGS AND WASTE MANAGEMENT | 26-4 |
| 26.7 | ENVIRONMENTAL | 26-6 |
| 26.8 | ECONOMIC ANALYSIS | 26-6 |
27.0 | REFERENCES | | 27-1 |
| 27.1 | GEOLOGY | 27-1 |
| 27.2 | ENVIRONMENTAL | 27-5 |
| 27.3 | MINING | 27-6 |
xi
| 27.4 | CAPITAL COST ESTIMATE | 27-6 |
| 27.5 | ECONOMIC ANALYSIS | 27-6 |
| 27.6 | ELECTRICAL POWER GENERATION | 27-6 |
28.0 | CERTIFICATES OF QUALIFIED PERSONS | 28-1 |
| 28.1 | MICHAEL F. O’BRIEN, M.SC., PR.SCI.NAT, FGSSA, FAUSIMM, FSAIMM | 28-1 |
| 28.2 | JIANHUI (JOHN) HUANG, PH.D., P.ENG | 28-3 |
| 28.3 | SABRY ABDEL HAFEZ, PH.D., P.ENG | 28-4 |
| 28.4 | HASSAN GHAFFARI, P.ENG | 28-5 |
| 28.5 | HARVEY WAYNE STOYKO, P.ENG | 28-6 |
| 28.6 | MICHAEL CHIN, P.ENG | 28-7 |
| 28.7 | GRAHAM WILKINS, P.ENG | 28-8 |
| 28.8 | MARVIN SILVA, PH.D., PE, P.ENG. | 28-9 |
| 28.9 | JACK DIMARCHI, CPG | 28-10 |
APPENDIX A | CLAIMS MAP AND LIST OF CLAIMS |
APPENDIX B | ACCESS ROAD |
APPENDIX C | AIRSTRIP |
APPENDIX D | TSF AND WATER MANAGEMENT |
APPENDIX E | CAPITAL COST BASIS OF ESTIMATE |
Table 1.1 | General Project Information | 1-3 |
Table 1.2 | Resource Estimate for the Arctic Project (NSR Cut-off of $35/t) | 1-6 |
Table 1.3 | Summary of Key Mining Results | 1-7 |
Table 1.4 | Capital Cost Summary | 1-13 |
Table 1.5 | Summary of Total Sustaining Capital Cost for LOM | 1-13 |
Table 1.6 | Overall Operating Cost Estimate | 1-14 |
Table 2.1 | Qualified Persons | 2-2 |
Table 6.1 | Known Mapping, Geochemical, and Geophysical Programs Targeting VMS Prospects in the Ambler Mining District | 6-4 |
Table 6.2 | Russell 1976 Resource Estimation | 6-11 |
Table 6.3 | Brown 1985 Resource Estimation | 6-12 |
Table 6.4 | Randolf 1990 Resource Estimation | 6-12 |
xii
| |
Table 6.5 | Kennecott 1995 Resource Estimation | 6-12 |
Table 6.6 | Historical Resources for the Dead Creek, Sunshine and Horse Cliff Prospects | 6-13 |
Table 9.1 | Summary of NovaCopper/NovaGold Exploration Activities Targeting VMS-style Mineralization in the Ambler Sequence Stratigraphy and the Arctic Deposit | 9-1 |
Table 9.2 | TDEM Loops and Locations | 9-7 |
Table 10.1 | Companies, Campaigns, Drill Holes and Metres Drilled at the Arctic Deposit | 10-1 |
Table 10.2 | Summary of NovaCopper/NovaGold Drilling | 10-2 |
Table 10.3 | Drill Contractors, Drill Holes, Metreage and Core Sizes by Drill Campaign at the Arctic Deposit | 10-5 |
Table 10.4 | Geotechnical Holes and Instrumentation | 10-8 |
Table 10.5 | Recovery and RQD 2004 to 2008 Arctic Drill Campaigns | 10-10 |
Table 10.6 | Drill Intercept Summary Table | 10-11 |
Table 10.7 | Drill, Metreage and Average Drill Depth for NovaCopper Ambler Sequence VMS Targets | 10-11 |
Table 10.8 | Significant Drill Intercepts – NovaCopper Ambler Sequence Prospects | 10-12 |
Table 10.9 | NovaCopper Exploration Drilling – Ambler Schist Belt | 10-14 |
Table 11.1 | Analytical Laboratories Used by Operators of the Arctic Project | 11-5 |
Table 12.1 | Assay Certificates Reviewed | 12-2 |
Table 13.1 | Metallurgical Test Work Programs | 13-1 |
Table 13.2 | Head Grades – Composite Samples – 2012 | 13-2 |
Table 13.3 | Mineral Modal Abundance for Composite Samples – 2012 | 13-3 |
Table 13.4 | Bond Ball Mill Grindability and Abrasion Index Test Results | 13-4 |
Table 13.5 | Locked Cycle Metallurgical Test Results | 13-8 |
Table 13.6 | Copper and Lead Separation Test Results | 13-11 |
Table 13.7 | Multi-element Assay Results – Copper Concentrate | 13-13 |
Table 13.8 | Multi-element Assay Results – Lead Concentrate | 13-13 |
Table 13.9 | Multi-element Assay Results – Zinc Concentrate | 13-14 |
Table 13.10 | Metallic Mineral Identified in Arctic Project Samples | 13-14 |
Table 13.11 | Bond Ball Mill Work Index | 13-16 |
Table 13.12 | Head Analyses | 13-18 |
Table 13.13 | Flotation Test on Ambler Low Talc Composite | 13-19 |
Table 14.1 | Historical Resource Estimate | 14-2 |
Table 14.2 | Drill Hole Assay Statistics – 2008 SRK Resource Estimation | 14-3 |
Table 14.3 | Historical SG Data Statistics – Arctic Deposit: 1998–2004 | 14-3 |
Table 14.4 | SG Measurements Categorized by Rock Type | 14-3 |
Table 14.5 | Arctic Deposit Resources at $100 GMV Cut-off – 2008 SRK | 14-4 |
Table 14.6 | Arctic Deposit Resources at $75 NSR Cut-off – 2011 SRK | 14-5 |
Table 14.7 | Arctic Deposit Resources at $75 NSR Cut-off – 2012 SRK | 14-6 |
Table 14.8 | Exploration Data within the Resource Area | 14-7 |
Table 14.9 | Modifications to Database for Resource Estimation | 14-7 |
Table 14.10 | Arctic Grade Estimation Domains | 14-9 |
Table 14.11 | Arctic SG Estimation Domains | 14-10 |
Table 14.12 | Arctic ABA Domains | 14-10 |
Table 14.13 | Raw Metal Sample Statistics (Length Weighted) | 14-13 |
Table 14.14 | Sample Length Statistics | 14-13 |
Table 14.15 | Arctic Deposit Drill Hole Composite Statistics | 14-15 |
Table 14.16 | Arctic SG Determinations Summary Statistics | 14-16 |
Table 14.17 | Arctic Density Interpolation Summary Statistics | 14-16 |
Table 14.18 | PAG and NAG Ratio Assignment for the ABA Domains | 14-17 |
Table 14.19 | Variogram Models | 14-18 |
Table 14.20 | Search Ellipse Orientation and Dimensions for Mineralization Domains | 14-21 |
Table 14.21 | Block Model Cell Attributes | 14-23 |
xiii
| |
Table 14.22 | Indicated Mineral Resource Table Restated by Mineralization Zone, Arctic Project, Alaska, Tetra Tech (June 30, 2013) | 14-39 |
Table 14.23 | Inferred Mineral Resource Table Restated by Mineralization Zone, Arctic Project, Alaska, Tetra Tech (June 30, 2013) | 14-39 |
Table 14.24 | Material Comprising the Indicated Mineral Resource (Table 14.22) Diluted to Full Blocks, Restated by Mineralization Zone, Arctic Project, Alaska | 14-40 |
Table 14.25 | Material Comprising the Inferred Mineral Resource (Table 14.23) Diluted to Full Blocks, Restated by Mineralization Zone, Arctic Project, Alaska | 14-40 |
Table 14.26 | Indicated Mineral Resource Table Sensitivity to NSR Within Whole Blocks | 14-41 |
Table 14.27 | Inferred Mineral Resource Table Sensitivity to NSR, Arctic Project Within Whole Blocks | 14-41 |
Table 16.1 | Pit Optimization Parameters | 16-3 |
Table 16.2 | Metallurgical Recovery | 16-5 |
Table 16.3 | Pit Optimization Results | 16-6 |
Table 16.4 | Haul Road Width | 16-8 |
Table 16.5 | Pit Design Results | 16-9 |
Table 16.6 | Production Schedule | 16-12 |
Table 16.7 | Operational Delays per Shift | 16-18 |
Table 16.8 | Haulage Cycle Times | 16-19 |
Table 16.9 | Primary Equipment Requirements | 16-19 |
Table 16.10 | Support Equipment Requirements | 16-19 |
Table 16.11 | Ancillary Equipment Requirements | 16-20 |
Table 16.12 | Operator and Maintenance Staff on Payroll | 16-21 |
Table 17.1 | Major Design Criteria | 17-4 |
Table 17.2 | Annual Concentrate Production Projection | 17-17 |
Table 18.1 | Components for Management of Non-contact Surface Waters | 18-16 |
Table 18.2 | Components for Management of Contact Surface Waters and Sediments | 18-16 |
Table 20.1 | Captured or Observed Fish Species | 20-3 |
Table 20.2 | Additional Recommended Environmental Baseline Studies | 20-6 |
Table 20.3 | Major Mine Permits Required for the Arctic Project | 20-8 |
Table 21.1 | Summary of Capital and Operating Costs | 21-1 |
Table 21.2 | CAPEX Summary | 21-2 |
Table 21.3 | Summary of Total Sustainable Capital Costs for LOM | 21-2 |
Table 21.4 | Foreign Exchange Rate Summary | 21-3 |
Table 21.5 | Summary of Mining Costs | 21-6 |
Table 21.6 | Mining Pre-production Unit Costs | 21-7 |
Table 21.7 | Initial Mining Equipment Fleet | 21-7 |
Table 21.8 | Sustaining Capital Mining Equipment Fleet | 21-8 |
Table 21.9 | Overall Operating Cost Estimate | 21-10 |
Table 21.10 | Relevant Consumables Prices | 21-10 |
Table 21.11 | Mining LOM and Unit Operating Cost Summary | 21-11 |
Table 21.12 | Summary of Process Operating Cost | 21-12 |
Table 21.13 | G&A Operating Costs | 21-13 |
Table 21.14 | Surface Services Operating Costs | 21-14 |
Table 22.1 | Mine/Metal Production from the Arctic Mine | 22-2 |
Table 22.2 | Summary of Pre-tax Financial Results | 22-4 |
Table 22.3 | Components of the Various Taxes | 22-9 |
Table 22.4 | Summary of Post-tax Financial Results | 22-9 |
Table 23.1 | Sun Deposit Historical Resources | 23-2 |
Table 23.2 | Smucker Deposit Historical Resources | 23-4 |
Table 24.1 | Bornite NI 43-101 Resources | 24-1 |
Table 25.1 | Resource estimate for the Arctic Project (NSR Cut-off of $35/t) | 25-2 |
xiv
Table 25.2 | Projected Recoveries and Concentrate Grades | 25-3 |
Figure 1.1 | Property Location Map | 1-2 |
Figure 1.2 | Arctic Project Site Layout | 1-10 |
Figure 4.1 | Location Map of the UKMP – Northwest Alaska | 4-2 |
Figure 4.2 | Upper Kobuk Mineral Projects Lands | 4-3 |
Figure 4.3 | Mineral Tenure Plan | 4-5 |
Figure 7.1 | Geologic Terranes of the Southern Brooks Range | 7-2 |
Figure 7.2 | Geology of the Ambler Mining District | 7-5 |
Figure 7.3 | Ambler Sequence Stratigraphy in the Arctic Deposit Area | 7-7 |
Figure 7.4 | Generalized Geology of the Central Ambler District | 7-8 |
Figure 7.5 | Typical F1 Isoclinal Folds Developed in Calcareous Gnurgle Gneiss | 7-9 |
Figure 7.6 | Generalized Geologic Map of the Arctic Deposit | 7-11 |
Figure 7.7 | Typical Massive Sulphide Mineralization at the Arctic Deposit | 7-16 |
Figure 7.8 | Prospects of the Ambler Mining District | 7-18 |
Figure 9.1 | Mapping Campaigns in and around the Arctic Deposit | 9-3 |
Figure 9.2 | Arctic Deposit Area Geology | 9-4 |
Figure 9.3 | Copper Distribution in Silt and Soil Samples in the Dead Creek Area | 9-5 |
Figure 9.4 | Zinc Distribution in Silt and Soil Samples in the Arctic Deposit Area | 9-6 |
Figure 9.5 | TDEM Loops and Contoured Resistivity – Dead Creek Prospect | 9-8 |
Figure 9.6 | PAG versus NAG by Rock Type at the Arctic Deposit | 9-11 |
Figure 10.1 | Plan Map of Drill Holes Utilized in the Mineral Resource Estimation | 10-3 |
Figure 10.2 | Drill Holes Utilized for Metallurgical, Geotechnical, Hydrological and Acid-Base Accounting Studies | 10-4 |
Figure 10.3 | Known Collar Locations and Principal Target Areas – Ambler District | 10-13 |
Figure 10.4 | Sunshine Prospect and Drill Hole Locations | 10-15 |
Figure 11.1 | Spatial Availability of QA/QC Data | 11-6 |
Figure 11.2 | Graph Showing Good Agreement between Wet-dry Measured Specific Gravity and Pycnometer Measured Specific Gravity | 11-13 |
Figure 11.3 | Measured versus Stoichiometric Specific Gravities | 11-14 |
Figure 11.4 | Scatter Plot Showing the Measured Specific Gravity versus Multiple (Copper, Iron, Zinc, Barium) Regression Estimate | 11-15 |
Figure 12.1 | Distribution of the Differences Between GPS Elevations and the DTM | 12-1 |
Figure 14.1 | Cross-section Illustrating the Arctic Deposit Geological Model | 14-9 |
Figure 14.2 | Contact Profile between Zone 1 SMS and Country Rock for Copper | 14-11 |
Figure 14.3 | Contact Profile between Zone 1 SMS and MS for Zinc | 14-12 |
Figure 14.4 | Lead Histogram | 14-14 |
Figure 14.5 | Gold Histogram | 14-15 |
Figure 14.6 | Copper: Variography in SMS Domains | 14-18 |
Figure 14.7 | Zinc: Variography in SMS Domains | 14-19 |
Figure 14.8 | Copper: Variography in MS Domains | 14-19 |
Figure 14.9 | Zinc: Variography in MS Domains | 14-20 |
Figure 14.10 | Cross-section for Copper | 14-25 |
Figure 14.11 | Cross-section for Zinc | 14-26 |
Figure 14.12 | Cross-section for Lead | 14-27 |
xv
| |
Figure 14.13 | Cross-section for Gold | 14-27 |
Figure 14.14 | Cross-section for Silver | 14-28 |
Figure 14.15 | Swath Plot of Block Copper Grade Values by Northing for the Arctic Deposit | 14-29 |
Figure 14.16 | Swath Plot of Block Copper Grade Values by Easting for the Arctic Deposit | 14-29 |
Figure 14.17 | Swath Plot of Block Zinc Grade Values by Northing for the Arctic Deposit | 14-30 |
Figure 14.18 | Swath Plot of Block Zinc Grade Values by Easting for the Arctic Deposit | 14-31 |
Figure 14.19 | Copper: Scatter Plot of OK versus ID Estimates | 14-32 |
Figure 14.20 | Zinc: Scatterplot of OK versus ID Estimates | 14-32 |
Figure 14.21 | Lead: Scatterplot of OK versus ID Estimates | 14-33 |
Figure 14.22 | Gold: Scatterplot of OK versus ID Estimates | 14-33 |
Figure 14.23 | Silver: Scatterplot of OK versus ID Estimates | 14-34 |
Figure 14.24 | Block Model Grade Tonnage Comparison: Copper OK (red line) and Copper ID2(broken line) | 14-35 |
Figure 14.25 | Block Model Grade Tonnage Comparison: Zinc OK (red line) and Zinc ID2 (broken line) | 14-35 |
Figure 14.26 | Block Model Grade Tonnage Comparison: Lead OK (red line) and Lead ID2 (broken line) | 14-36 |
Figure 14.27 | Block Model Grade Tonnage Comparison: Gold OK (red line) and Gold ID2 (broken line) | 14-36 |
Figure 14.28 | Block Model Grade Tonnage Comparison: Silver OK (red line) and Silver ID2 (broken line) | 14-37 |
Figure 16.1 | Arctic Project Topography | 16-2 |
Figure 16.2 | Pit Wall Slope | 16-7 |
Figure 16.3 | One-way Haul Road | 16-8 |
Figure 16.4 | Two-way Haul Road | 16-9 |
Figure 16.5 | Pit Design | 16-10 |
Figure 16.6 | Production Schedule | 16-13 |
Figure 16.7 | Pre-production Year Mine Status Map | 16-14 |
Figure 16.8 | Year 4 Mine Status Map | 16-15 |
Figure 16.9 | Year 8 Mine Status Map | 16-16 |
Figure 16.10 | Year 12 Mine Status Map | 16-17 |
Figure 17.1 | Simplified Process Flow Diagram | 17-3 |
Figure 18.1 | Final General Arrangement Layout after 12 years of Operation | 18-3 |
Figure 18.2 | Access to the Arctic Project | 18-4 |
Figure 18.3 | Tailings Storage Facility | 18-12 |
Figure 18.4 | Tailings Embankment Cross Section | 18-13 |
Figure 20.1 | Comparison of Benthic Macroinvertebrate Community Measures | 20-4 |
Figure 21.1 | LOM Average Operating Cost Distribution | 21-10 |
Figure 22.1 | Pre-tax Undiscounted Annual and Cumulative NCF | 22-4 |
Figure 22.2 | Pre-tax NPV Sensitivity Analysis | 22-6 |
Figure 22.3 | Pre-tax IRR Sensitivity Analysis | 22-6 |
Figure 22.4 | Pre-tax Payback Period Sensitivity Analysis | 22-7 |
Figure 23.1 | Adjacent Properties and Land Status | 23-1 |
Figure 23.2 | Sun Project Prospect Location Map | 23-3 |
xvi
UNITS OFMEASURE | |
above mean sea level | amsl |
acre | ac |
ampere | A |
annum (year) | a |
billion | B |
billion tonnes | Bt |
billion years ago | Ga |
British thermal unit | BTU |
centimetre | cm |
cubic centimetre | cm3 |
cubic feet per minute | cfm |
cubic feet per second | ft3/s |
cubic foot | ft3 |
cubic inch | in3 |
cubic metre | m3 |
cubic yard | yd3 |
Coefficients of Variation | CVs |
day | d |
days per week | d/wk |
days per year (annum) | d/a |
dead weight tonnes | DWT |
decibel adjusted | dBa |
decibel | dB |
degree | ° |
degrees Celsius | °C |
diameter | ø |
dollar (American) | US$ |
dollar (Canadian) | Cdn$ |
dry metric ton | dmt |
foot | ft |
gallon | gal |
gallons per minute (US) | gpm |
Gigajoule | GJ |
gigapascal | GPa |
gigawatt | GW |
gram | g |
grams per litre | g/L |
xvii
grams per tonne | g/t |
greater than | > |
hectare (10,000 m2) | ha |
hertz | Hz |
horsepower | hp |
hour | h |
hours per day | h/d |
hours per week | h/wk |
hours per year | h/a |
inch | in |
kilo (thousand) | k |
kilobar | kb |
kilogram | kg |
kilograms per cubic metre | kg/m3 |
kilograms per hour | kg/h |
kilograms per square metre | kg/m2 |
kilometre | km |
kilometres per hour | km/h |
kilopascal | kPa |
kilotonne | kt |
kilovolt | kV |
kilovolt-ampere | kVA |
kilovolts | kV |
kilowatt | kW |
kilowatt hour | kWh |
kilowatt hours per tonne | kWh/t |
kilowatt hours per year | kWh/a |
less than | < |
litre | L |
litres per minute | L/m |
megabytes per second | Mb/s |
megapascal | MPa |
megavolt-ampere | MVA |
megawatt | MW |
metre | m |
metres above mean sea level | mamsl |
metres above sea level | masl |
metres Baltic sea level | mbsl |
metres per minute | m/min |
metres per second | m/s |
microns | µm |
milligram | mg |
milligrams per litre | mg/L |
millilitre | mL |
millimetre | mm |
xviii
million | M |
million bank cubic metres | Mbm3 |
million bank cubic metres per annum | Mbm3/a |
million tonnes | Mt |
minute (plane angle) | ' |
minute (time) | min |
month | mo |
ounce | oz |
pascal | Pa |
centipoise | mPa·s |
parts per million | ppm |
parts per billion | ppb |
percent | % |
pound(s) | lb |
pounds per square inch | psi |
revolutions per minute | rpm |
second (plane angle) | " |
second (time) | s |
short ton (2,000 lb) | st |
short tons per day | st/d |
short tons per year | st/y |
specific gravity | SG |
square centimetre | cm2 |
square foot | ft2 |
square inch | in2 |
square kilometre | km2 |
square metre | m2 |
three-dimensional | 3D |
tonne (1,000 kg) (metric ton) | t |
tonnes per day | t/d |
tonnes per hour | t/h |
tonnes per year | t/a |
tonnes seconds per hour metre cubed | ts/hm3 |
volt | V |
week | wk |
weight/weight | w/w |
wet metric ton | wmt |
| |
ABBREVIATIONS ANDACRONYMS | |
abrasion index | Ai |
acid potential | AP |
acid rock drainage | ARD |
acid-base accounting | ABA |
Acme Analytical Laboratories Ltd | AcmeLabs |
xix
| |
Alaska Department of Environmental Conservation | ADEC |
Alaska Department of Fish and Game | ADF&G |
Alaska Department of Natural Resources | ADNR |
Alaska Department of Transportation | ADOT |
Alaska Industrial Development Export Authority | AIDEA |
Alaska Mining Licence Tax | AMLT |
Alaska National Interest Lands Conservation Act | ANILCA |
Alaska Native Claims Settlement Act | ANCSA |
Alaska Native Regional Corporations | ANCSA Corporations |
Alaska Pollution Discharge Elimination System | APDES |
Alaska State Tax | AST |
ALS Chemex Laboratories | ALS Chemex |
Alternative Minimum Tax | AMT |
aluminium oxide | Al2O3 |
Ambler Mining District Industrial Access Road | AMDIAR |
ammonium nitrate/fuel oil | ANFO |
Analytical Spectral Devices | ASD |
Andover Mining Corp. | Andover |
Annual Hardrock Exploration Activity | AHEA |
Arctic Property | the Property |
atomic absorption spectroscopy | AAS |
atomic absorption | AA |
average relative difference | AD |
barium | Ba |
Bear Creek Mining Corporation | BCMC |
BGC Engineering Inc. | BGC |
Bond ball mill work index | BWi |
Canadian Institute of Mining, Metallurgy and Petroleum | CIM |
capital cost estimate | CAPEX |
carboxymethyl cellulose | CMC |
Center of the Universe | COU |
Clean Water Act | CWA |
Controlled Source Audio Magnetotelluric | CSAMT |
copper equivalent | CuEq |
copper | Cu |
cumulative net cash flow | CNCF |
Democratic Republic of the Congo | DRC |
digital terrain model | DTM |
distributed control system | DCS |
Document Management System | DMS |
domain electromagnetic | DEM |
EBA, A Tetra Tech Company | EBA |
effective grinding length | EGL |
Electromagnetic | EM |
engineering, procurement and construction management | EPCM |
xx
| |
environmental impact statement | EIS |
Environmental Protection Agency | EPA |
Ephemeroptera, Plecoptera, Trichoptera | EPT |
Ernst & Young LLP | EY |
Exploration Incentive Credits | EICs |
Fine Sediment Biotic Index | FSBI |
general and administrative | G&A |
GeoSpark Consulting Inc. | GeoSpark |
global positioning system | GPS |
gold | Au |
Gross Metal Value | GMV |
heating, ventilation and air conditioning | HVAC |
inductively coupled plasma | ICP |
inductively coupled plasma-atomic emission spectroscopy | ICP-AES |
inductively coupled plasma-mass spectrometry | ICP-MS |
input/output | I/O |
Interior Energy Project | IEP |
internal rate of return | IRR |
International Electrotechnical Commission | IEC |
International Organization for Standardization | ISO |
inverse distance squared | ID2 |
iron | Fe |
Kennecott Mining Company | Kennecott |
Kennecott Research Center | KRC |
kriging efficiency | KE |
Lakefield Research Ltd. | Lakefield |
lead | Pb |
Lerchs-Grossmann | LG |
life-of-mine | LOM |
light-emitting diode | LED |
liquefied natural gas | LNG |
Localizer Performance with Vertical Guidance | LPV |
magnesium oxide | MgO |
magnesium | Mg |
massive sulphide | MS |
memorandum of understanding | MOU |
metal leaching | ML |
methyl isobutyl carbinol | MIBC |
motor control centres | MCCs |
Multi-Sector General Permit | MSGP |
NANA Regional Corporation Inc. | NANA |
National Environmental Policy Act | NEPA |
National Instrument 43-101 | NI 43-101 |
nearest neighbour | NN |
net cash flow | NCF |
xxi
| |
net present value | NPV |
neutralization potential | NP |
non-acid generating | NAG |
North American Datum | NAD |
Northwest Alaska Native Association | NANA |
Northwest Arctic Borough | NWAB |
NovaCopper Inc. | NovaCopper |
NovaGold Resources Inc. | NovaGold |
operating cost estimate | OPEX |
operator interface stations | OIS |
ordinary kriging | OK |
potentially acid generating | PAG |
Precision Approach Path Indicators | PAPIs |
preliminary economic assessment | PEA |
programmable logic controllers | PLCs |
Qualified Person | QP |
quality assurance/quality control | QA/QC |
Quantitative Evaluation of Minerals by Scanning Electronic Microscopy | QEMSCAM® |
Quantitative Kriging Neighbourhood Analysis | QKNA |
Resource Associates of Alaska | RAA |
Robertson Geoconsultants Inc | Robertson |
rock mass rating | RMR |
rock quality designation | RQD |
run-of-mine | ROM |
Runway End Identification Lighting System | REILS |
SAG mill and ball mill | SAB |
semi-autogenous grinding | SAG |
semi-massive sulphide | SMS |
SGS Mineral Services | SGS |
short wave infrared | SWIR |
silver | Ag |
sodium isopropyl xanthate | SIPX |
sodium | Na |
SRK Consulting | SRK |
sulphur | S |
tailings storage facility | TSF |
Teck Resources Ltd. | Teck |
theoretical slope of regression | ZZ* |
thermal ionization mass spectrometry | TIMS |
Thompson-Howarth Precision Versus Concentration | THPVC |
time domain electromagnetic | TDEM |
titanium dioxide | TiO2 |
total inorganic carbon | TIC |
Universal Transverse Mercator | UTM |
Upper Kobuk Mineral Projects | UKMP |
xxii
US Army Corps of Engineers | USACE |
US Geological Survey | USGS |
vibrating wire piezometers | VWPs |
volcanogenic massive sulphide | VMS |
water quality standards | WQS |
Watts, Griffis and McOuat Ltd. | WGM |
Wide Area Augmentation System | WAAS |
x-ray fluorescence | XRF |
zinc | Zn |
xxiii
NovaCopper Inc. (NovaCopper) retained Tetra Tech and EBA, a Tetra Tech Company (EBA) to prepare a preliminary economic assessment (PEA) for the Arctic Project and disclose it in a technical report prepared in accordance with National Instrument 43-101 (NI 43-101) and Form 43-101F1. The Arctic Property (the Property) is located in the Ambler mining district (Ambler District) of the southern Brooks Range, in the Northwest Arctic Borough (NWAB) of Alaska. The Property is located 270 km east of the town of Kotzebue, 36 km northeast of the village of Kobuk, and 260 km west of the Dalton Highway, an all-weather state maintained highway. Figure 1.1 illustrates the location of the Property.
The PEA describes the potential technical and economic viability of establishing a conventional open-pit mine, a mill complex and related infrastructure to process massive and semi-massive copper-zinc-lead-silver-gold mineralization from the Arctic Deposit. A minimum 12-year mine life supporting a nominal 10,000 t/d conventional grinding mill-and-flotation circuit is envisaged. The base case scenario assumes long-term metal prices of $2.90/lb for copper, $0.85/lb for zinc, $0.90/lb for lead, $22.70/oz for silver and $1,300/oz for gold. The PEA was prepared on a 100% ownership basis and all amounts are stated in US dollars unless otherwise noted.
The effective date of this report is September 12, 2013 and the effective date of the resource model is July 30, 2013.
General information for the Arctic Project is summarized in Table 1.1.
NovaCopper Inc. | 1-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 1.1 Property Location Map
NovaCopper Inc. | 1-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 1.1 General Project Information
Description | Unit | Amount |
Mill Feed | Mt | 35.7 |
Life-of-mine (LOM) | years | 12 |
Milling Rate | t/d | 10,000 |
Strip Ratio | waste:mineralized material | 8.4 |
Total Project Capital Cost | $ million | 717.7 |
Average Overall Operating Cost* | $/t milled | 63.93 |
Pre-tax Net Present Value (NPV) at 8% Discount Rate** | $ million | 927.7 |
Pre-tax Internal Rate of Return (IRR) | % | 22.8 |
Pre-tax Payback Period | years | 4.6 |
Post-tax NPV at 8% Discount Rate | $ million | 537.2 |
Post-tax IRR | % | 17.9 |
Post-tax Payback Period | years | 5.0 |
| Notes: | *Excludes pre-production cost. |
| | **The base case utilizes long-term metal prices of $2.90/lb for copper, $0.85/lb for zinc, $0.90/lb for lead, $22.70/oz for silver and $1,300/oz for gold. |
The PEA should not be considered to be a prefeasibility or feasibility study, as the economics and technical viability of the Arctic Project have not been demonstrated at this time. The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Furthermore, there is no certainty that the PEA results will be realized.
1.2 | PROPERTY DESCRIPTION AND LOCATION |
The Arctic Project is located in the Ambler District of the southern Brooks Range, in the NWAB of Alaska. The Property is geographically isolated with no current road access or nearby power infrastructure. The Property is located 270 km east of the town of Kotzebue, 36 km northeast of the village of Kobuk, and 260 km west of the Dalton Highway, an all-weather state maintained highway.
The Property is part of the Upper Kobuk Mineral Projects (UKMP), which includes the Arctic and Bornite deposits. In October 2011, NovaCopper entered into an exploration agreement with NANA Regional Corporation, Inc. (NANA) for the development of the parties’ collective resource interests in the Ambler District. The agreement consolidates certain land holdings of the parties into an area of interest consisting of an approximately 143,000 ha land package.
1.3 | GEOLOGY AND MINERALIZATION |
The Ambler District is located on the southern margin of the Brooks Range and hosts: 1) a belt of Devonian volcanogenic massive sulphide (VMS) deposits, including the Property which contains the Arctic Deposit; and 2) a belt of Devonian epigenetic carbonate-hosted copper deposits including the Bornite Deposit.
The district encompasses an east-west trending zone of Devonian to Jurassic age submarine volcanic and sedimentary rocks occurring as structurally bound, imbricate allochtons (Hitzman et al. 1986) and further characterized by increasing metamorphic grade to the north. The district shows isoclinal folding in the northern portion and thrust faulting to south (Schmidt 1983).
NovaCopper Inc. | 1-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
On the Property, VMS-style deposits and prospects (including the Arctic Deposit) are hosted in the Ambler Sequence, a group of Middle Devonian to Early Mississippian, metamorphosed, bimodal volcanic rocks with interbedded tuffaceous, graphitic, and calcareous volcaniclastic metasediments. The Ambler sequence occurs in the upper part of the regional Anirak Schist. VMS-style mineralization is found along the entire 110 km strike length of the district.
The Ambler Sequence has undergone two periods of intense, penetrative deformation. The first deformation period is characterised by upper greenschist-facies metamorphism and formation of a penetrative schistosity. Folding varies from isoclinal folding with local transposition of bedding units, to pervasive upright or slightly overturned folds verging north on all scales. This fold event deforms the transposed bedding and schistosity, and defines the subsequent event.
Stratigraphically, the Ambler Sequence consists of variably metamorphosed calc-turbidites, overlain by calcareous schists with irregularly distributed mafic sills and pillow lavas. These are overlain by the Arctic-sulphide host section which consists mainly of fine-grained, carbonaceous siliciclastic rocks which are in turn overlain by reworked silicic volcanic rocks, including meta-rhyolite porphyries and most notably the regionally extensive Button Schist with its characteristically large relic phenocrysts. Greywacke sandstones, interpreted to be turbidites, occur throughout the section but are concentrated higher in the stratigraphy. Several rock units within the stratigraphy show substantial variation in local thickness as a consequence of basin morphology at the time of deposition.
Alteration at the Arctic Deposit is characterized by magnesium alteration, primarily as talc, chlorite and phengite alteration products associated with the sulphide-bearing horizons and continuing in the footwall. Stratigraphically above the sulphide-bearing horizons, significant muscovite as paragonite is developed and results in a marked shift in Na/Mg (sodium/magnesium) ratios across the sulphide bearing horizons.
Mineralization occurs as stratiform semi-massive sulphide (SMS) to massive sulphide (MS) beds within primarily graphitic chlorite schists and fine-grained quartz sandstones. The sulphide beds average 4 m in thickness but vary from less than 1 m up to as much as 18 m in thickness.
The bulk of the mineralization is within six modelled SMS zones cored by five MS zones lying along the upper and lower limbs of the Arctic isoclinal anticline. Wireframes of the mineralized horizons have been modeled based on MS defined by more than 50% sulphide minerals and SMS defined by 35 to 50% sulphide minerals. All of the zones are within an area of roughly 1 km2 with mineralization extending to a depth of approximately 250 m below the surface. Mineralization is predominately coarse-grained sulphides consisting mainly of chalcopyrite, sphalerite, galena, tetrahedrite, arsenopyrite, pyrite and pyrrhotite. Trace amounts of electrum and enargite are also present.
NovaCopper Inc. | 1-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
A new mineral resource has been estimated by Mr. Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM, who is an independent Qualified Person (QP), as defined in section 1.5 of NI 43-101. The mineral resource is listed in Table 1.2 and the effective date of this resource estimate is July 30, 2013.
The mineral resource estimate prepared by Tetra Tech considers diamond drill holes drilled by different operators from 1965 to 2011. The majority of the drilling has been completed in recent years by NovaCopper and its previous parent company NovaGold Resources Inc. (NovaGold). The mineral resource for the Arctic Project is supported by 43 core holes (approximately 13,500 m) drilled by NovaGold and 92 core holes (approximately 17,600 m) drilled by previous owners Kennecott Mining Company (Kennecott), and/or a Kennecott subsidiary. The geological and assay database have been reviewed and verified by Tetra Tech. It is Tetra Tech’s opinion that the current drilling information is adequate to support a mineral resource estimate.
Leapfrog™ software (version 2.5.1) was used to review and verify the resource estimation domains, prior to being imported into Isatis™ software (version 2012.1) to prepare assay data for geostatistical analysis, variography, block model construction, metal grade estimation and mineral resource tabulation. Mineral Resources were estimated into five massive-sulphide and six semi-massive sulphide lenses and then grades for the mineralized material portion of a 10 m by 10 m by 5 m block were calculated based on the proportion of MS and SMS within each block. Whole block model grades were calculated based on the weighted value of the estimated grade item based on the proportion of the mineralization domain. Whole blocks, including internal dilution, were used in pit optimization. Extreme lead and gold assays were capped prior to compositing. Ordinary kriging (OK) and inverse distance squared (ID2) estimates were run, with OK used for resource reporting and ID2 used for validation. Search parameters were constrained within each mineralized domain and required an optimum number of 15 composites, minimum number of 5 composites, minimum number of 2 drill holes, and maximum search distance range of 200 m. In general, blocks categorized as Indicated were supported by at least 2 drill holes within a 75 m search radii, and blocks categorized as Inferred were supported by at least 2 drill holes within a 150 m search radii.
Differences between the previously reported mineral resource estimate (as reported in the Technical Report dated April 24, 2012) are primarily related to additional drilling, updated geological interpretation, additional specific gravity determinations, and reporting of grades and tonnes within an open pit designed to support the requirements for reasonable prospects for economic extraction.
NovaCopper Inc. | 1-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 1.2 Resource Estimate for the Arctic Project (NSR Cut-off of $35/t)
Category | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Au (Moz) | Ag (Moz) |
Indicated | 23.848 | 3.26 | 4.45 | 0.76 | 0.71 | 53.2 | 1,713 | 2,338 | 400.9 | 0.55 | 40.8 |
Inferred | 3.363 | 3.22 | 3.84 | 0.58 | 0.59 | 41.5 | 239 | 285 | 43.2 | 0.06 | 4.5 |
| Notes: | 1. | These resource estimates have been prepared in accordance with NI 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum ( CIM) Definition Standards. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Inferred resources have a great amount of uncertainty as to their existence and whether they can be mined legally or economically. It cannot be assumed that all or any part of the Inferred resources will ever be upgraded to a higher category. |
| | 2. | Mineral Resources are reported within mineralization wireframes, contained within an Indicated and Inferred pit design using an assumed copper price of $2.90/lb, zinc price of $0.85/lb, lead price of $0.90/lb, silver price of $22.70/oz, and gold price of $1,300/oz. |
| | 3. | Appropriate mining costs, processing costs, metal recoveries and inter ramp pit slope angles were used to generate the pit design. |
| | 4. | The $35.01/t milled cut-off is calculated based on a process operating cost of $19.03/t, G&A of $7.22/t and site services of $8.76/t. NSR equals payable metal values, based on the metal prices outlined in Note 2 above, less applicable treatment, smelting, refining costs, penalties, concentrate transportation costs, insurance and losses and royalties. |
| | 5. | The LOM strip ratio is 8.39. |
| | 6. | Rounding as required by reporting guidelines may result in apparent summation differences between tonnes, grade and contained metal content. |
| | 7. | Tonnage and grade measurements are in metric units. Contained copper, zinc and lead pounds are reported as imperial pounds, contained silver and gold ounces as troy ounces. |
1.5 | MINERAL PROCESSING AND METALLURGICAL TESTING |
Since 1970, metallurgical test work has been conducted to determine the flotation response of various samples extracted from the Arctic Deposit. In general, the samples tested produced similar metallurgical performances. In 2012, SGS Mineral Services (SGS) conducted a metallurgical test program to further study metallurgical responses of the samples produced from Zones 1, 2, 3, and 5 of the Arctic Deposit. The flotation test procedures used talc pre-flotation, conventional copper-lead bulk flotation and zinc flotation, followed by copper and lead separation. In general, the 2012 test results indicated that the samples responded well to the flowsheet tested. The average results of the locked cycle tests (without copper and lead separation) were as follows:
| • | The copper recoveries to the bulk copper-lead concentrates ranged from 89 to 93% excluding the Zone 1 & 2 composite which produced a copper recovery of approximately 84%; the copper grades of the bulk concentrates were 24 to 28%. |
| | |
| • | Approximately 92 to 94% of the lead was recovered to the bulk copper-lead concentrates containing 9 to 13% lead. |
| | |
| • | The zinc recovery was 84.2% from Composite Zone 1 & 2, 93.0% from Composite Zone 3 and 90.5% from Composite Zone 5. On average, the zinc grades of the concentrates produced were higher than 55%, excluding the concentrate generated from Composite Zone 1 & 2, which contained only 44.5% zinc. |
| | |
NovaCopper Inc. | 1-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | Gold and silver were predominantly recovered into the bulk copper-lead concentrates. Gold recoveries to this concentrate ranged from 65 to 80%, and silver recoveries ranged from 80 to 86%. |
Using an open circuit procedure, the copper and lead separation tests on the bulk copper-lead concentrate produced from the locked cycle tests generated reasonable copper and lead separation. The copper concentrates produced contained approximately 28 to 31% copper, while the grades of the lead concentrates were in the range of 41% to 67% lead. Also, it appears that most of the gold reported to the copper concentrate and on average the silver was equally recovered into the copper and lead concentrates.
The 2012 grindability test results showed that the Bond ball millwork index (BWi) tests ranged from 6.5 to 11 kWh/t and abrasion index (Ai) tests fluctuated from 0.017 to 0.072 g for the mineralized samples. The data indicates that the samples are neither resistant nor abrasive to ball mill grinding. The materials are considered to be soft or very soft in terms of grinding requirements.
The PEA is based on a conventional truck-and-shovel, open-pit mine design at a single pit. The mining schedule was developed based on a maximum mill capacity of 10,000 t/d. The Arctic Project’s total mine life is 13 years, including 1 year of pre-stripping followed by 12 years of production. The pit uses four pushbacks and a minimum mining width of 40 m. Over the 13-year life, the pit is producing 35.7 Mt of mineralized material and 299.4 Mt of waste rock. The LOM stripping ratio is 8.39 and the stripping ratio excluding the pre-stripping waste rock is 7.94. The pit design incorporates a bench height of 5 m and a 45° inter-ramp angle. After adding the ramps, the overall slope angle will be within 43°, as recommended by EBA (2013). Key mining results are summarized in Table 1.3.
Table 1.3 Summary of Key Mining Results
Item | Units | Value |
Mining Pre-stripping | years | 1 |
LOM | years | 12 |
Mineralized Material | Mt | 35.7 |
Waste Material | Mt | 299.4 |
Stripping Ratio | waste:mineralized material | 8.4 |
Average Mining Operating Cost | US$/t milled | 28.40 |
A 10,000 t/d process plant has been designed to process the massive/semi-massive sulphide mineralization that will be supplied from the open pit mine. The main economic elements found in the deposit are copper, lead, zinc, and associated gold and silver. The process plant will operate two shifts per day and 365 d/a with an overall plant availability of 92%. The process plant will produce copper, lead, and zinc concentrates.
NovaCopper Inc. | 1-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The mill feed will be hauled from the pit to a primary crushing facility where the material will be crushed by a jaw crusher to a particle size of 80% passing 125 mm.
The crushed material will be ground by two stages of grinding, consisting of one semi-autogenous grinding (SAG) mill and one ball mill in closed circuit with hydrocyclones (SAG mill and ball mill (SAB) circuit). The hydrocyclone overflow with a grind size of approximately 80% passing 70 µm will be processed by talc pre-flotation, conventional bulk flotation (to recover copper, lead, and associated gold and silver), and then zinc flotation. The rougher bulk copper-lead concentrate will be reground and cleaned, and then followed by copper and lead separation to produce a lead concentrate and a copper concentrate. The zinc rougher flotation concentrate will be reground and upgraded by cleaner flotation to produce a zinc concentrate. The final tailings from the zinc flotation circuit will be pumped to the tailings storage facility (TSF). Copper, lead, and zinc concentrates will be thickened and pressure-filtered separately before being shipped to smelters.
The LOM average mill feed is expected to contain 2.28% copper, 0.53% lead, 3.13% zinc, 0.5 g/t gold, and 37 g/t silver. According to the mine plan developed for the PEA study and metallurgical test results, the LOM average metal recoveries and concentrate grades are projected below:
| • | copper concentrate: | |
| | - | recovery: 87.1% copper; 57.9% gold; 40.2% silver |
| | - | copper grade: 29% |
| | | |
| • | lead concentrate: | |
| | - | recovery: 74.0% lead; 6.8% gold; 40.2% silver |
| | - | lead grade: 50% |
| | | |
| • | zinc concentrate: | |
| | - | recovery: 86.8% zinc |
| | - | zinc grade: 56%. |
1.8 | PROJECT INFRASTRUCTURE |
The proposed Arctic mine site is spread over a distance of approximately 6 km within the upper reaches of the Sub-Arctic Creek Valley.
Primary access to the Property is currently by air, using both fixed wing aircraft and helicopters. No surface access is currently in place. A memorandum of understanding (MOU) has been signed with the Alaska Industrial Development Export Authority (AIDEA) for the development of the Ambler Mining District Industrial Access Road (AMDIAR) which would provide access from the Dalton Highway (Highway 11) to within 17 km of the Arctic Project.
NovaCopper Inc. | 1-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The proposed development for the Arctic Project consists of the following major infrastructure:
| • | roads and an airstrip |
| | |
| • | mill buildings and related services facilities including maintenance and truck shops, and assay lab |
| | |
| • | water supply and distribution |
| | |
| • | waste management |
| | |
| • | fuel storage |
| | |
| • | on site explosive storage |
| | |
| • | power supply |
| | |
| • | TSF and water management |
| | |
| • | water treatment plant |
| | |
| • | construction and permanent camp accommodation |
| | |
| • | waste rock storage facilities |
| | |
| • | communication. |
All buildings and facilities will be constructed with appropriate heating, ventilation and air conditioning (HVAC) and fire protection systems, water distribution and plumbing systems, and dust control systems. Figure 1.2 illustrates the overall Project site layout.
A series of mine haul roads will be constructed from the open pit to the primary crusher, and as well as site roads to and from the truck shop, TSF, and to the Arctic Project airstrip.
NovaCopper Inc. | 1-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 1.2 Arctic Project Site Layout
The Arctic Project requires 15 MW of peak load for 10,000 t/d operation demand. Power will be generated by 4+1 self-contained 3.6 MW Prime diesel generators. Four units will be in service with the fifth unit reserved for maintenance. Heat will be recovered from the generators and used to heat the mill.
NovaCopper Inc. | 1-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
1.8.2 | TAILINGS STORAGE FACILITY |
The co-disposal TSF will be a fully lined facility consisting of rockfill embankment constructed across the Sub-Arctic Creek drainage, creating an impoundment that will extend up the drainage. The rockfill embankment will be constructed to an ultimate crest elevation of 655 mamsl with the embankment being raised in stages to minimize the initial capital construction cost. During operations, potentially acid generating (PAG) waste rock will be placed at the bottom and sides of the basin forming layers with consecutive disposal on tailings that will be filling the voids. The tailings has the potential to generate acid and, therefore, the tailings and the PAG waste rock will be placed under water and remain permanently submerged in order to reduce the potential for acid generation. Additional studies will be required to determine the most suitable method of co-disposal and potential requirements for acid rock drainage (ARD) management and mitigation programs will need to be part of the design of the TSF.
The TSF will be required to contain 110.5 Mm3 total over the 12-year LOM, with 23.8 Mm3to accommodate the tailings at an assumed stored dry density of 1.5 t/m3 and 86.7 Mm3 of PAG waste rock at an assumed stored dry density of 1.9 t/m3. The TSF will be sited as a staged rockfill embankment with an upstream geomembrane liner. The starter embankment will have a crest elevation of 560 m and impound 1 year of mining production, which is approximately 670,000 m3 of tailings and 12.3 Mm3 of waste rock.
NovaCopper initiated baseline environmental data collection in 2007, including surface water quality sampling, wetlands mapping, stream flow monitoring, aquatic life surveys, subsistence, meteorological monitoring, and acid base accounting sampling. Additional baseline environmental data in the Ambler Lowlands, the Subarctic Creek drainage, the Shungnak River drainage and downstream receiving environments will be required to support future mine design, development of an environmental impact statement (EIS), permitting, construction and operations.
The Arctic Project has the potential to significantly improve work opportunities for local and regional residents. In October 2011, NovaCopper signed an agreement with NANA. In addition to consolidating landholdings in the Ambler District, the agreement has language establishing native hiring preferences and preferential use of NANA subsidiaries for contract work. Furthermore, the agreement formalized an Oversight Committee, with equal representation from NovaCopper and NANA, to regularly review project plans and activities. In addition, a Subsistence Subcommittee has been formed to protect subsistence and the Iñupiaq way of life and a Workforce Development Subcommittee is also in place to address current and future employment needs. NovaCopper meets monthly, during summer months, with the residents of Kobuk, Shungnak and Ambler, the three villages closest to the project area. NovaCopper also meets annually with eight other NANA region villages including Noatak, Kivalina, Kotzebue, Kiana, Deering, Buckland, Selawik and Noorvik, for the purpose of updating residents on project plans and fielding their questions and concerns. NovaCopper has also developed a good working relationship with the NWAB government.
NovaCopper Inc. | 1-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The Arctic Project will be subject to a mine permitting process which will include compliance with theNational Environmental Policy Act (NEPA) and will require a number of major mine permits from state and federal agencies as well as a significant number of minor permits. Although a number of federal conservation units are located in the general vicinity of the Arctic Project, including but not limited to the Gates of the Arctic National Parks, Kobuk Preserve, Selawik National Wildlife Refuge, and Kobuk Valley and Selawik Wilderness areas, there presence does not change the permitting process nor add to the number of permits required for the Arctic Project.
NovaCopper will be required to develop a formal project description and detailed reclamation and closure plan to support a successful permit application strategy. The mine plan will embrace the concept of “design for closure”. In order to reduce any lasting risk of environmental impacts, the plan will minimize surface disturbances during operations and promote long-term stability of the site after closure.
1.10 | CAPITAL COSTS (INITIAL AND SUSTAINING) |
The total estimated capital cost for the design, construction, installation and commissioning of the Arctic Project is estimated to be $717.7 million. A summary of the estimated capital cost is shown in Table 1.4. The total sustaining capital costs of $164.4 million for the 12 year LOM including equipment, tailings and other items are summarized in Table 1.5.
This capital cost estimate has been prepared in accordance with the recommended practices of the AACE International. In accordance with the AACE’s International Estimate Classification System, this cost estimate meets or exceeds the specifications for a Class 5 Estimate and has a deemed accuracy of ±35%.
Tetra Tech prepared this estimate with a base date of Q2 2013. No escalation beyond Q2 2013 was applied to the estimate. Quotations provided by vendors are budgetary and non-binding.
The capital cost estimate uses US dollars as the base currency.
NovaCopper Inc. | 1-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 1.4 Capital Cost Summary
| Item | Total Cost ($ million) |
| Direct Costs | |
10 | Overall Site | 82.5 |
20 | Open Pit Mining | 119.7 |
35 | Mineralized Material Handling | 17.4 |
40 | Process | 122.2 |
50 | Tailings and Water Management | 21.0 |
70 | On-Site Infrastructure | 49.1 |
75 | Airstrip | 14.2 |
86 | External Access Roads | 27.2 |
87 | Temporary Services | 23.1 |
Subtotal Direct Costs | 476.4 |
90 | Indirect Costs | 130.9 |
98 | Owner’s Costs | 18.6 |
99 | Contingency | 91.9 |
Total Capital Costs | 717.7 |
Note: Total may not add up due to rounding.
Table 1.5 Summary of Total Sustaining Capital Cost for LOM
Item | Total Cost ($ million) |
Mining Equipment | 45.6 |
Tailings | 112.8 |
Other Equipment | 6.0 |
Total Sustaining Capital | 164.4 |
The total LOM average operating cost for the proposed mine is estimated at $63.93/t milled. The estimate includes mining, processing, tailings management, general and administrative (G&A), surface services and public road toll costs. The cost is estimated based on a total LOM mill feed of 35.68 Mt from the open pit mine. The nominal annual process rate is approximately 3,650,000 t/a (LOM average annual process rate is approximately 2,973,435 t/a) or 10,000 t/d (LOM daily average rate is 8,146 t/d) at 365 d/a.
Tetra Tech has not estimated the road toll cost that NovaCopper will pay to use the AMDIAR proposed to be built by the Government of Alaska. Since this cost is determined by confidential negotiations between NovaCopper and the AIDEA, a State-owned private corporation, Tetra Tech has relied on NovaCopper management to provide the road toll cost. For the purposes of this PEA study, it has been assumed that a toll would be paid based on a $150 million 30-year bond at a 5% interest rate, which would result in the Arctic Project paying approximately $9.7 million each year for its 12-year mine life. The toll payments are assumed in the PEA to commence when the Arctic Project has reached commercial production.
NovaCopper Inc. | 1-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The accuracy for the operating cost estimate is expected to be within a range of ±35%. The operating cost estimate uses US dollars as the base currency. The breakdown of the estimated operating costs is presented in Table 1.6.
Table 1.6 Overall Operating Cost Estimate
Area | LOM Average Unit Operating Cost ($/t milled) |
Mining* | 28.40 |
Processing** | 19.86 |
G&A | 8.92 |
Plant Services | 3.48 |
Road Toll | 3.27 |
Total | 63.93 |
| Notes: | *Excluding preproduction cost |
| | **Including tailings management operation cost |
This PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Furthermore, there is no certainty that this PEA will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.
Tetra Tech prepared an economic evaluation of the Arctic Project based on a pre-tax financial model. NPV was estimated at the beginning of the two-year construction period.
As of May 30, 2013, the long-term metal prices applied in the economic analysis are as follows:
| • | copper: $2.90/lb |
| | |
| • | lead: $0.90/lb |
| | |
| • | zinc: $0.85/lb |
| | |
| • | gold: $1,300.00/oz |
| | |
| • | silver: $22.70/oz. |
The pre-tax financial results are:
NovaCopper Inc. | 1-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | 4.6-year payback on the $717.7 million initial capital costs |
| | |
| • | $927.7 million NPV at an 8% discount rate. |
NovaCopper engaged the Canadian firm of Ernst & Young LLP (EY) in Vancouver, BC to prepare tax calculations for use in the post-tax economic evaluation of the Arctic Project with the inclusion of US federal and Alaska income taxes and Alaska Mining License tax (Section 22.0) ..
The following post-tax financial results were calculated:
| • | 17.9% IRR |
| | |
| • | 5.0-year payback on the $717.7 million initial capital costs |
| | |
| • | $537.2 million NPV at an 8% discount rate. |
1.13 | INTERPRETATION AND CONCLUSIONS |
Based on the work carried out in this PEA and the resultant economic evaluation, this study should be followed by further technical and economic studies leading to a prefeasibility study.
1.14 | OPPORTUNITIES AND RECOMMENDATIONS |
Tetra Tech recommends the following actions further outlined in Section 26.0 which may support the Arctic Project advancement should NovaCopper proceed with a prefeasibility study. As part of the recommended work program, the following areas of work should be considered:
| • | resource model integration and additional drilling to upgrade the Inferred Resource |
| | |
| • | geotechnical studies, including geotechnical investigations of the pit area, plant site, TSF site, airstrip and other project related locations |
| | |
| • | engineering studies, including power supply and optimization of the layout of the process and service related facilities |
| | |
| • | metallurgical studies, including process flowsheet and condition optimization and determination of process design related parameters |
| | |
| • | additional waste characterization studies |
| | |
| • | additional baseline studies and environmental permitting activities |
| | |
| • | marketing studies |
| | |
| • | trade-off studies to maximize project economics. |
NovaCopper Inc. | 1-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NovaCopper retained Tetra Tech to conduct a PEA on its Arctic Project in the Ambler District of northwestern Alaska (Figure 1.1). The results of that PEA are disclosed in this technical report, which has been prepared in accordance with NI 43-101 and Form 43-101F1.
The PEA describes the potential technical and economic viability of establishing a conventional open-pit copper-zinc-lead-silver-gold mine-and-mill complex for the Arctic Project.
This report supersedes and replaces a previous PEA, prepared for NovaGold by SRK in 2012. The SRK report was based on an underground mine plan with significantly different parameters. On this basis, the previous PEA is considered neither current nor relevant to current development planning on the Property. For completeness, the previous PEA report is available to the interested reader on NovaCopper’s’s SEDAR profile.
Tetra Tech and EBA (a Tetra Tech company) QPs are responsible for all sections of the current technical report. NovaCopper also engaged the Canadian firm EY in Vancouver, BC to prepare tax calculations for use in the post-tax economic evaluation of the Arctic Project (Section 22.0). Tetra Tech used the information completed by these contributors to support information in this current technical report.
The PEA has been prepared on a 100% ownership basis and all amounts are stated in US dollars unless otherwise noted.
2.1.1 | UNITS OF MEASUREMENT |
All units of measurement in this technical report and resource estimate are metric, unless otherwise stated.
The monetary units are in US dollars, unless otherwise stated.
NovaCopper Inc. | 2-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
As shown in Table 2.1, the following people served as the QPs as defined in NI 43-101,Standards of Disclosure for Mineral Projects, and in compliance with Form 43-101F1:
Table 2.1 Qualified Persons
| Report Section | Company | QP |
1.0 | Summary | All | Sign-off by Section |
2.0
| Introduction
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
3.0
| Reliance on Other Experts
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
4.0
| Property Description and Location
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
5.0
| Accessibility, Climate, Local Resources, Infrastructure, and Physiography | Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
6.0
| History
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
7.0
| Geological Setting and Mineralization
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
8.0
| Deposit Types
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
9.0
| Exploration
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
10.0
| Drilling
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
11.0
| Sample Preparation, Analyses, and Security
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
12.0
| Data Verification
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
13.0 | Mineral Processing and Metallurgical Testing | Tetra Tech | John Huang, Ph.D., P.Eng. |
14.0
| Mineral Resource Estimates
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
15.0 | Mineral Reserve Estimates | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
16.0 | Mining Methods | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
17.0 | Recovery Methods | Tetra Tech | John Huang, Ph.D., P.Eng. |
18.0 | Project Infrastructure | - | - |
| 18.1 | Overview | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.2 | Roads and Airstrip | - | - |
| 18.2.1 | Ambler Mining District Industrial Access Road | Tetra Tech | Michael Chin, P.Eng. |
| 18.2.2 | Access Road | EBA | Graham Wilkins, P.Eng. |
| 18.2.3 | Haul Roads, Site Roads, and Pad Areas | Tetra Tech | Michael Chin, P.Eng. |
| 18.2.4 | Airstrip | EBA | Graham Wilkins, P.Eng. |
table continues…
NovaCopper Inc. | 2-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
| | Report Section | Company | QP |
| 18.3 | Buildings and Relevant Building Services | Tetra Tech | John Huang, Ph.D., P.Eng. |
| 18.4 | Water Supply and Distribution | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.5 | Waste Management | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.6 | Fuel Storage | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.7 | On Site Explosives Storage | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
| 18.8 | Power Supply to Plant Site | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.9 | Tailings Storage Facility | Tetra Tech | Marvin Silva, Ph.D., PE, P.Eng. |
| 18.10 | Waste Rock Facilities | Tetra Tech | Marvin Silva, Ph.D., PE, P.Eng |
| 18.11 | Water Management | Tetra Tech | Marvin Silva, Ph.D., PE, P.Eng. |
| 18.12 | Water Treatment Plant | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.13 | Construction and Permanent Camp Accommodation | Tetra Tech | Hassan Ghaffari, P.Eng. |
| 18.14 | Communications | Tetra Tech | Hassan Ghaffari, P.Eng. |
19.0 | Market Studies and Contracts | Tetra Tech | John Huang, Ph.D., P.Eng. |
20.0 | Environmental Studies, Permitting, and Social or Community Impact | Tetra Tech | Jack DiMarchi, CPG |
21.0 | Capital and Operating Costs | - | - |
| 21.1
| Introduction
| Tetra Tech
| Harvey Wayne Stoyko, P.Eng./ John Huang, Ph.D., P.Eng. |
| 21.2 | Capital Cost Estimate | Tetra Tech | Harvey Wayne Stoyko, P.Eng. |
| 21.3 | Elements of Cost | Tetra Tech | Harvey Wayne Stoyko, P.Eng. |
| 21.4 | Mining Capital Cost Estimate | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
| 21.5 | Operating Cost Estimate | - | - |
| 21.5.1 | Summary | Tetra Tech | John Huang, Ph.D., P.Eng. |
| 21.5.2 | Mining Operating Cost Estimate | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
| 21.5.3 | Processing Operating Costs | Tetra Tech | John Huang, Ph.D., P.Eng. |
| 21.5.4 | General and Administrative Costs and Surface Services Costs | Tetra Tech | John Huang, Ph.D., P.Eng. |
| 21.5.5 | Tailings Storage Facility Cost | Tetra Tech | Marvin Silva, Ph.D., PE, P.Eng. |
| 21.5.6 | Road Toll Cost | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
22.0 | Economic Analysis | Tetra Tech | Sabry Abdel Hafez, Ph.D., P.Eng. |
23.0
| Adjacent Properties
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
24.0
| Other Relevant Data and Information
| Tetra Tech
| Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM |
25.0 | Interpretation and Conclusions | All | Sign-off by Section |
26.0 | Recommendations | All | Sign-off by Section |
27.0 | References | All | Sign-off by Section |
28.0 | Certificates of Qualified Persons | All | Sign-off by Section |
NovaCopper Inc. | 2-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The following QPs conducted site visits to the Arctic Project:
| • | Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM, completed a site visit on June 19, 2013 for three days. |
| | |
| • | Sabry Abdel Hafez, Ph.D., P.Eng., completed a site visit on June 19, 2013 for three days. |
| | |
| • | Graham Wilkins, P.Eng., completed a one day helicopter flyover in the fall of 2011. |
2.4 | SCOPE OF PERSONAL INSPECTIONS |
During a June 2013 site visit, Mr. O’Brien undertook a helicopter inspection of the proposed access road, airstrip, Bornite exploration camp, and the Arctic valley. A total of nine drill sites were inspected in the field, during two foot traverses over representative areas of the Arctic Deposit. Collar locations were checked using a hand-held global positioning system (GPS), and within the limits of such instrumentation, collar locations matched those of the 2013 drill database. Several zones of outcrop were inspected, including a zone of “talc” on the backside of the Arctic ridge. There was no active drilling at Arctic; however, NovaCopper logging and sampling facilities were in operation and a review of company procedures found staff to be following industry best practices. Mr. O’Brien also visited the NovaCopper core storage facility in Fairbanks and reviewed three drill holes for lithology, mineralization and the quality of storage. Core boxes were found to be in good condition and intervals were easily retrieved. Furthermore, Mr. O’Brien also held meetings with NovaCopper project staff including Scott Petsel (UKMP Project Manager), Stuart Morris (Senior Project Geologist) and Andy West (Senior Project Geologist).
During a June 2013 site visit, Mr. Abdel Hafez undertook a high-level helicopter traverse along the proposed access road, airstrip and Arctic valley, as well as a visual, on-the-ground inspection of surface conditions near the proposed open pit, waste dump, mill and mine complex, camp, and TSF. During the site visit, Mr. Abdel Hafez viewed the Arctic Project topography and the locations of the proposed infrastructure.
Reports and documents listed in Section 27.0 were used to support the preparation of the technical report. Additional information was sought from NovaCopper personnel where required.
NovaCopper Inc. | 2-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
3.0 | RELIANCEONOTHEREXPERTS |
The QPs who prepared this report relied on information provided by other experts as noted below. The relevant QPs believe that it is reasonable to rely on these experts, based on the assumption that the experts have the necessary education, professional designations, and relevant experience on matters relevant to the technical report.
Tetra Tech has relied on NovaCopper’s management team for estimating the annual toll to be paid by the Arctic Project for use of the AMDIAR. This estimate is disclosed in Section 21.0 and is based on discussions between NovaCopper’s management and senior executives of the AIDEA.
Tetra Tech has also relied on NovaCopper’s public disclosures for estimating the applicable royalties on the Arctic Deposit used in the economic analysis. This reliance is based on NovaCopper’s Second Quarter 2013 Management Discussion & Analysis, dated May 31, 2013 (http://www.novacopper.com/i/pdf/financials/2013-Q2-MDA.pdf).
3.1 | MICHAEL F. O’BRIEN, M.SC., PR.SCI.NAT, FGSSA, FAUSIMM, FSAIMM |
Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM, relied on Erin Workman, P.Geo., Director, Technical Services and Joe R. Piekenbrock, VP Exploration, both from NovaCopper, for matters relating to mineral tenure and mining rights permits, surface rights, royalties, agreements and encumbrances relevant to this report.
3.2 | SABRY ABDEL HAFEZ, PH.D., P.ENG. |
Sabry Abdel Hafez, Ph.D., P.Eng., relied on EY, concerning tax matters relevant to this report. The reliance is based on a letter to Tetra Tech titled “Assistance with income tax and mineral tax portions of economic analysis prepared by Tetra Tech in connection with the Preliminary Economic Assessment report on NovaCopper’s Arctic Project” and dated July 26, 2013.
NovaCopper Inc. | 3-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
4.0 | PROPERTY DESCRIPTION AND LOCATION |
The Property is part of the UKMP mineral tenure package, which includes the Arctic Deposit, as well as numerous additional mineral showings/deposits (Figure 4.1 and Figure 4.2). The Property is located in the Ambler District of the southern Brooks Range, in the NWAB of Alaska,. The Property is located in Ambler River A-2 quadrangle, Kateel River Meridian T 20N R 11E, section 2, and T 21N, R 11E, sections 34 and 35.
The Arctic Project is located 260 km east of the town of Kotzebue, 30 km north of the village of Kobuk, 260 km west of the Dalton Highway, an all-weather state maintained public road, at geographic coordinates N67.17° latitude and W156.38° longitude (Universal Transverse Mercator (UTM) North American Datum (NAD) 83, Zone 4 coordinates 7453080N, 613110E).
NovaCopper Inc. | 4-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 4.1 Location MapoftheUKMP–Northwest Alaska
NovaCopper Inc. | 4-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| Figure 4.2UpperKobukMineralProjectsLands |
NovaCopper Inc. | 4-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
The Property comprises 45,348 ha of State of Alaska mining claims and US Federal patented mining claims in the Kotzebue Recording District. The Arctic Project land tenure consists of 1,358 contiguous claims, including 875 40-acre State claims, 481 160-acre State claims, and two Federal patented claims comprising 272 acres (110 ha) held in the name of NovaCopper US Inc. These claims are shown in Figure 4.3 and listed in Appendix A. The Arctic Project is located near the southern edge of the centre of the claim block. The Federal patented claim corners were located by the US Geological Survey (USGS). There is no expiration date or labor requirement on the Federal patented claims. Rent for each State claim is paid annually to the Alaska Department of Natural Resources (ADNR). An Annual Labor Statement must be submitted annually to maintain the State claims in good standing.
NovaCopper Inc. | 4-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Figure 4.3MineralTenurePlan |
NovaCopper Inc. | 4-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
4.3 | ROYALTIES,AGREEMENTSANDENCUMBRANCES |
The Arctic Deposit was discovered in 1965, and originally staked by Bear Creek Mining Corporation (BCMC), a subsidiary of Kennecott Copper Corporation at the time. Until 1993, BCMC was the operator, and from 1993 to 1998 Kennecott Minerals was the operator.
On March 22, 2004, Alaska Gold Company, a wholly-owned subsidiary of NovaGold Resources Inc. (NovaGold) completed an Exploration and Option to Earn an Interest Agreement with Kennecott Exploration Company and Kennecott Arctic Company (collectively, Kennecott) on the Ambler land holdings.
On December 18, 2009, a Purchase and Termination Agreement was entered into between Alaska Gold Company and Kennecott whereby NovaGold agreed to pay Kennecott a total purchase price of $29 million for a 100% interest in the Ambler land holdings, which included the Arctic Project, to be paid as: $5 million by issuing 931,098 NovaGold shares, and two installments of $12 million each, due 12 months and 24 months from the closing date of January 7, 2010. The NovaGold shares were issued in January 2010, the first $12 million payment was made on January 7, 2011, and the second $12 million payment was made in advance on August 5, 2011; this terminated the March 22, 2004 exploration agreement between NovaGold and Kennecott. Under the Purchase and Termination Agreement, the seller retained a 1% net smelter return (NSR) royalty that is purchasable at any time by the land owner for a one-time payment of $10 million.
During 2011, NovaGold incorporated the NovaCopper entities and transferred its Ambler land holdings, including the Arctic Project from Alaska Gold Company to NovaCopper US Inc. In April 2012, NovaGold completed a spin-out of NovaCopper, with the Ambler lands, to the NovaGold shareholders and made NovaCopper an independent stand alone public company.
In 1971, the US Congress passed the Alaska Native Claims Settlement Act (ANCSA) which settled land and financial claims made by the Alaska Natives and provided for the establishment of 13 regional corporations to administer those claims. These are known as the Alaska Native Regional Corporations (ANCSA Corporations). One of these 13 regional corporations is the Northwest Alaska Native Association (NANA) Regional Corporation, Inc. ANCSA Lands controlled by NANA bound the southern border of the Property claim block. National Park lands are within 25 km of the northern property border.
NovaCopper Inc. | 4-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
On October 19, 2011, NovaCopper and NANA Regional Corporation, Inc. entered into an Exploration Agreement and Option to Lease (the “NANA Agreement”) for the cooperative development of their respective resource interests in the Ambler mining district. The NANA Agreement consolidates NovaCopper’s and NANA’s land holdings into an approximately 142,831 ha land package and provides a framework for the exploration and development of the area. The NANA Agreement provides that NANA will grant NovaCopper the nonexclusive right to enter on, and the exclusive right to explore, the Bornite Lands and the ANCSA Lands (each as defined in the NANA Agreement) and in connection therewith, to construct and utilize temporary access roads, camps, airstrips and other incidental works. The NANA Agreement has a term of 20 years, with an option in favour of NovaCopper to extend the term for an additional 10 years. The NANA Agreement may be terminated by mutual agreement of the parties or by NANA if NovaCopper does not meet certain expenditure requirements on NANA’s lands.
If, following receipt of a feasibility study and the release for public comment of a related draft environmental impact statement, NovaCopper decides to proceed with construction of a mine on the lands subject to the NANA Agreement, NovaCopper will notify NANA in writing and NANA will have 120 days to elect to either (a) exercise a non-transferrable back-in-right to acquire between 16% and 25% (as specified by NANA) of that specific project; or (b) not exercise its back-in-right, and instead receive a net proceeds royalty equal to 15% of the net proceeds realized by NovaCopper from such project. The cost to exercise such back-in-right is equal to the percentage interest in the Arctic Project multiplied by the difference between (i) all costs incurred by NovaCopper or its affiliates on the project, including historical costs incurred prior to the date of the NANA Agreement together with interest on the historical costs; and (ii) $40 million (subject to exceptions). This amount will be payable by NANA to NovaCopper in cash at the time the parties enter into a joint venture agreement and in no event will the amount be less than zero.
In the event that NANA elects to exercise its back-in-right, the parties will, as soon as reasonably practicable, form a joint venture with NANA’s interest being between 16% to 25% and NovaCopper owning the balance of the interest in the joint venture. Upon formation of the joint venture, the joint venture will assume all of the obligations of NovaCopper and be entitled to all the benefits of NovaCopper under the NANA Agreement in connection with the mine to be developed and the related lands. A party’s failure to pay its proportionate share of costs in connection with the joint venture will result in dilution of its interest. Each party will have a right of first refusal over any proposed transfer of the other party’s interest in the joint venture other than to an affiliate or for the purposes of granting security. A transfer by either party of a net smelter royalty return on the project or any net proceeds royalty interest in a project other than for financing purposes will also be subject to a first right of refusal.
In connection with possible development on the Bornite Lands or ANCSA Lands, NovaCopper and NANA will execute a mining lease to allow NovaCopper or the joint venture to construct and operate a mine on the Bornite Lands or ANCSA Lands (the “Mining Lease”). These leases will provide NANA a 2% net smelter royalty as to production from the Bornite Lands and a 2.5% net smelter royalty as to production from the ANCSA Lands.
NovaCopper Inc. | 4-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
If NovaCopper decides to proceed with construction of a mine on its own lands subject to the NANA Agreement, NANA will enter into a surface use agreement with NovaCopper which will afford NovaCopper access to the project along routes approved by NANA (the “Surface Use Agreement”). In consideration for the grant of such surface use rights, NovaCopper will grant NANA a 1% net smelter royalty on production and an annual payment of $755 per acre (as adjusted for inflation each year beginning with the second anniversary of the effective date of the NANA Agreement and for each of the first 400 acres (and $100 for each additional acre) of the lands owned by NANA and used for access which are disturbed and not reclaimed.
4.4 | ENVIRONMENTALLIABILITIES |
There are no known environmental liabilities due to previous operators or ongoing NovaCopper exploration activities at the Property. There has been no mine development or production on the Property. As a result, NovaCopper has not incurred outstanding environmental liabilities in conjunction with its entry into the NANA Agreement.
Multiple permits are required during the exploration phase of the Property. Permits are issued from Federal, State, and Regional agencies, including: the Environmental Protection Agency (EPA), the US Army Corps of Engineers (USACE), the Alaska Department of Environmental Conservation (ADEC), the Alaska Department of Fish and Game (ADF&G), the Alaska Department of Natural Resources (ADNR), and the NWAB. The State of Alaska permit for exploration on the Property, the Annual Hardrock Exploration Activity (AHEA) Permit, is obtained and renewed every five years through the ADNR – Division of Mining, Land and Water. NovaCopper holds an AHEA exploration permit in good standing with the Alaska DNR, and has done so each year since 2004 under Alaska Gold Company, a wholly owned subsidiary of NovaGold and now NovaCopper. The Property is within the NWAB thus requiring a Title 9 Miscellaneous Land Use permit for mineral exploration, fuel storage, gravel extraction, and the operation of a landfill. NovaGold held these permits in good standing during the 2004 to 2008 seasons and renewed the permits for the 2010 exploration season to 2015. The Bornite Camp, Bornite Landfill, Dahl Creek Camp, and the to-be-constructed Arctic Camp are permitted by the ADEC.
A number of statutory reports and payments are required to maintain the claims in good standing on an annual basis. As the Arctic Project progresses, additional permits for environmental baseline and detailed engineering studies will be necessary at federal, state, and local levels. A detailed outline of permitting requirements is discussed in Section 20.0.
NovaCopper Inc. | 4-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
5.0 | ACCESSIBILITY, CLIMATE, LOCAL |
| RESOURCES, INFRASTRUCTURE AND |
| PHYSIOGRAPHY |
5.1 | ACCESSIBILITY |
| |
5.1.1 | AIR |
Primary access to the Property is by air, using both fixed wing aircraft and helicopters.
There are four well maintained, approximately 1,500 m-long gravel airstrips located near the Property, capable of accommodating charter fixed wing aircraft. These airstrips are located 66 km west at Ambler, 46 km southwest at Shungnak, 36 km southwest at Kobuk, and 32 km southwest at Dahl Creek. There is daily commercial air service from Kotzebue to the village of Kobuk, the closest community to the Property. During the summer months, the Dahl Creek Camp airstrip is suitable for larger aircraft, such as C-130 and DC-6.
In addition to the four 1,500 m airstrips, there is a 700 m airstrip located at the Bornite Camp, approximately 25 km southwest of the Property, and a 400 m airstrip located approximately 10 km southwest of the Property. The airstrip at Bornite is suited to smaller aircraft, which support the Bornite Camp with personnel and supplies.
5.1.2 | WATER |
| |
| There is no direct water access to the Property. During spring runoff, river access is possible by barge from Kotzebue Sound to Ambler, Shungnak, and Kobuk via the Kobuk River. |
| |
5.1.3 | ROAD |
| |
| A winter trail and a one -lane dirt track suitable for high-clearance vehicles or construction equipment links the Arctic Project’s main camp at Bornite to the 400 m Dahl Creek airstrip and camp southwest of the Arctic Deposit. An unimproved gravel track connects the airstrip with the Arctic Deposit. |
| |
5.2 | CLIMATE |
| |
| The climate in the region is typical of a sub-arctic environment. Exploration is generally conducted from late May until late September. Weather conditions on the Property can vary significantly from year to year and can change suddenly. During the summer exploration season, average maximum temperatures range from 10°C to 20°C, while average lows range from -2°C to 7°C (Alaska Climate Summaries: Kobuk 1971 to 2000). By early October, unpredictable weather limits safe helicopter travel to the Property. During winter months, the Property can be accessed by snow machine, track vehicle, or fixed wing aircraft. Winter temperatures are routinely below -25°C and can exceed -50°C. Annual precipitation in the region averages at 395 mm with the most rainfall occurring from June through September, and the most snowfall occurring from November through January. |
NovaCopper Inc. | 5-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
The Property is approximately 270 km east of the town of Kotzebue, on the edge of Kotzebue Sound, 36 km northeast of the village of Kobuk, 260 km west of the Dalton Highway, and 470 km northwest of Fairbanks. Kobuk (population 151; 2010 US Census) is a potential workforce source for the Arctic Project, and is the location of one of the airstrips near the Property. Several other villages are also near the Property, including Shungnak located 45 km to the southwest with a population of 262 (2010 US Census) and Ambler, 64 km to the west with a population of 258 (2010 US Census). Kotzebue has a population of 3,201 (2010 US Census) and is the largest population centre in the Northwest Arctic Borough. Kotzebue is a potential source of limited mining-related supplies and labourers, and is the nearest centre serviced by regularly scheduled, large commercial aircraft (via Nome or Anchorage). In addition, there are seven other villages in the region that will be a potential source of some of the workforce for the Property. Fairbanks (population 32,036; 2011 US Census) has a long mining history and can provide most mining-related supplies and support that cannot be sourced closer to the Property.
Drilling and mapping programs are seasonal and have been supported out of the Main Bornite Camp and Dahl Creek Camp. The main Bornite Camp facilities are located on Ruby Creek on the northern edge of the Cosmos Hills. The camp provides office space and accommodations for the geologists, drillers, pilots, and support staff. There are four 2-person cabins installed by NANA prior to NovaCopper’s tenure.
In 2011, the main Bornite Camp was expanded to 20 sleeping tents, 3 administrative tents, 2 shower/bathroom tents, 1 medical tent, and 1 dining/cooking tent. With these additions, the camp capacity was increased to 49 beds. A 30 m by 9 m core logging facility was also built in summer of 2011. An incinerator was installed near the Bornite airstrip to manage waste created by the Arctic Project. Power for the Arctic Project is supplied by a 175 kW Caterpillar diesel generator. Water is provided by a permitted artesian well located 250 m from the Bornite Camp.
In 2012, the camp was further expanded with the addition of a laundry tent, a women's shower/washroom tent, a recreation tent, several additional sleeping tents, and a 2 x enlargement of the kitchen tent. Camp capacity increased to 76 beds. The septic field was upgraded to accommodate the increase in camp population. One of the two-person cabins was winterized for use by the winter caretaker. A permitted landfill was established to allow for the continued cleanup and rehabilitation of the historic shop facilities and surroundings.
NovaCopper Inc. | 5-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The Dahl Creek camp is an overflow or alternative facility to the main Bornite Camp. The Dahl Creek camp has a main cabin for dining and administrative duties, and a shower facility. Sleeping facilities include two hard-sided sleeping cabins with seven beds (primarily used for staff), two 4-person sleeping tents, and three 2-person sleeping tents for a total of 21 beds. There are support structures, including a shop and storage facilities.
Proposed infrastructure is discussed in more detail in Section 18.0. Currently, the Arctic Project does not have access to Alaska power and transportation infrastructure.
Beginning in 2009, the Property has been the focus of the Ambler Mining District Access Corridor study. The State of Alaska has spent approximately US$10 M to identify proposed access routes and to initiate environmental baseline studies. The working group for this study consists of the Alaska Department of Transportation (ADOT), the ADNR, the Governor’s Office, the AIDEA, NANA, and NovaCopper.
The proposed Ambler Access Route is a 322 km road running east from the Property to the Dalton Highway. The environmental baseline study for the route is expected to be completed in 2013, with the environmental impact study to follow in early 2014. Following the completion of these studies, public meetings will be held with the final environmental impact study targeted for late 2014.
The Arctic Project is located along the south slope of the Brooks Range, which separates the Arctic region from the interior of Alaska. Nearby surface water includes Subarctic Creek, the Shungnak and Kogoluktuk Rivers, the Kobuk River, and numerous small lakes. The Arctic Project is located at the eastern end of Subarctic Creek, a tributary of the Shungnak River to the west, along a ridge between Subarctic Creek and the Kogoluktuk River Valley. The Property area is marked by steep and rugged terrain with high topographic relief. Elevations range from 30 masl along the Kobuk River to 1,180 masl on a peak immediately north of the Arctic Project area. The divide between the Shungnak and Kogoluktuk Rivers in the Ambler Lowlands is approximately 220 masl.
The Kobuk Valley is located at the transition between boreal forest and Arctic tundra. Spruce, birch, and poplar are found in portions of the valley, with a ground cover of lichens (reindeer moss). Willow and alder thickets and isolated cottonwoods follow drainages, and alpine tundra is found at higher elevations. Tussock tundra and low, heath-type vegetation covers most of the valley floor. Intermittant permafrost exists on the Property.
Permafrost is a layer of soil at variable depths beneath the surface where the temperature has been below freezing continuously from a few to several thousands of years (Climate of Alaska 2007). Permafrost exists where summer heating fails to penetrate to the base of the layer of frozen ground and occurs in most of the northern third of Alaska as well as in discontinuous or isolated patches in the central portion of the state.
NovaCopper Inc. | 5-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Wildlife in the Property area is typical of Arctic and Subarctic fauna (Kobuk Valley National Park 2007). Larger animals include caribou, moose, Dall sheep, bears (grizzly and black), wolves, wolverines, coyotes, and foxes. Fish species include salmon, sheefish, arctic char, and arctic grayling. The Kobuk River, which briefly enters the UKMP on its southwest corner, is a significant salmon spawning river. Subarctic Creek, which does not contain andromous fish, drains into the Shungnak River, which drains into the Kobuk River. The Caribou on the Property belong to the Western Arctic herd that migrates twice a year – south in August, from their summer range north of the Brooks Range, and north in March from their winter range along the Buckland River.
NovaCopper Inc. | 5-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Prospectors first arrived in the Ambler District around 1900, shortly after the discovery of the Nome and Fairbanks gold districts. Several small gold placer deposits were located in the southern Cosmos Hills south of the Arctic Deposit and worked intermittently over the next few years. During this time copper mineralization was observed at Ruby Creek in the northern Cosmos Hills; however, no exploration was undertaken until 1947 when local prospector Rhinehart “Rhiny” Berg located outcropping mineralization along Ruby Creek. Berg subsequently staked claims over the Ruby Creek showings and constructed an airstrip for access (alaskamininghalloffame.org 2012).
BCMC, an exploration subsidiary of Kennecott, optioned the property from Berg in 1957. The prospect became known as Bornite and Kennecott conducted extensive exploration over the next decade, culminating in the discovery of the high-grade No. 1 orebody and the sinking of an exploration shaft to conduct underground drilling.
In conjunction with the discovery of the Bornite Deposit, BCMC greatly expanded their regional reconnaissance exploration in the Cosmos Hills and the southern Brooks Range. Stream silt sampling in 1963 revealed a significant copper anomaly in Arctic Creek roughly 17 km northeast of Bornite. The area was subsequently staked and, in 1967, eight core holes were drilled at the Arctic Deposit yielding impressive massive sulphide intercepts over an almost 500-m strike length.
BCMC conducted intensive exploration on the property until 1977 and then intermittently through 1998. No drilling or additional exploration was conducted on the Arctic Project between 1998 and 2004.
In addition to drilling and exploration at the Arctic Deposit, BCMC also conducted exploration at numerous other prospects in the Ambler District (most notably Dead Creek, Sunshine, Cliff, and Horse). The abundance of VMS prospects in the district resulted in a series of competing companies, including Sunshine Mining Company, Anaconda, Noranda, Teck Cominco, Resource Associates of Alaska (RAA), Watts, Griffis and McOuat Ltd. (WGM), and Houston Oil and Minerals Company, entering into a claim staking war in the district in 1973.
District exploration by Sunshine Mining Company and Anaconda resulted in two additional significant discoveries in the district:
| • | the Sun Deposit located 60 km east of the Arctic Deposit |
| | |
| • | the Smucker Deposit located 40 km west of the Arctic Deposit. |
NovaCopper Inc. | 6-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
District exploration continued until the early 1980s on the four larger deposits in the district (Arctic, Bornite, Smucker and Sun) when the district fell into a hiatus due to depressed metal prices.
In 1987, Cominco acquired the claims covering the Sun and Smucker deposits from Anaconda. Teck, as Cominco’s successor company, continues to hold the Smucker Deposit. In 2007, Andover Mining Corporation purchased a 100% interest in the Sun Deposit for US$13 million.
In 1981 and 1983, Kennecott received three US Mineral Survey patents (#2245 totalling 240 acres over the Arctic Deposit – later amended to include another 32 acres; and #2233 and #2234 for 25 claims totalling 516.5 acres at Bornite. The Bornite patented claims and surface development were subsequently sold to NANA Regional Corporation, Inc. in 1986.
No production has occurred at the Arctic Deposit or at any of the other deposits within the district.
6.1 | PRIOR OWNERSHIP AND OWNERSHIP CHANGES – ARCTIC DEPOSIT AND THEAMBLER LANDS |
BCMC initially staked federal mining claims covering the Arctic Deposit area beginning in 1965. The success of the 1960’s drill programs defined a significant high-grade polymetallic resource at the Arctic Deposit and, in the early 1970s, Kennecott began the patent process to obtain complete legal title to the Arctic Deposit. In 1981, Kennecott received US Mineral Survey patent #2245 covering 16 mining claims totalling 240.018 acres. In 1983, US Mineral Survey patent #2245 was amended to include two additional claims totalling 31.91 acres.
With the passage of theAlaska National Interest Lands Conservation Act (ANILCA) in 1980, which expedited native land claims outlined in the ANSCA and state lands claims under theAlaska Statehood Act, both the state of Alaska and NANA selected significant areas of land within the Ambler District. State selections covered much of the Ambler schist belt, host to the VMS deposits including the Arctic Deposit, while NANA selected significant portions of the Ambler Lowlands to the immediate south of the Arctic Deposit as well as much of the Cosmos Hills including the area immediately around Bornite.
In 1995, Kennecott renewed exploration in the Ambler schist belt containing the Arctic Deposit patented claims by staking an additional 48 state claims at Nora and 15 state claims at Sunshine Creek. In the fall of 1997, Kennecott staked 2,035 state claims in the belt consolidating their entire land position and acquiring the majority of the remaining prospective terrain in the VMS belt. Five more claims were subsequently added in 1998. After a short period of exploration which focused on geophysics and geochemistry combined with limited drilling, exploration work on the Arctic Project again entered a hiatus.
NovaCopper Inc. | 6-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
On March 22, 2004, Alaska Gold Company, a wholly-owned subsidiary of NovaGold completed an Exploration and Option Agreement with Kennecott to earn an interest in the Ambler land holdings. A description of the current mineral tenure, as well as recent royalties, agreements and encumbrances is provided in Section 4.0.
6.2 | PREVIOUS EXPLORATION AND DEVELOPMENT RESULTS – ARCTIC DEPOSIT |
| |
6.2.1 | INTRODUCTION |
Kennecott’s tenure at the Arctic Project saw two periods of intensive work from 1965 to 1985 and from 1993 to 1998, before optioning the property to NovaGold in 2004.
Though abundant reports, memos, and files exist in Kennecott’s Salt Lake City office, only limited digital compilation of the data exists for the earliest generation of exploration at the Arctic Deposit and within the VMS belt. Beginning in 1993, Kennecott initiated a reevaluation of the Arctic Deposit and assembled a computer database of previous work at the Arctic Deposit and in the district. A new computer-generated block model was constructed in 1995 and an updated resource of the deposit was calculated from the block model. Subsequently, Kennecott staked a total of 2,035 State of Alaska claims in 1997 and, in 1998 undertook the first field program since 1985.
Due to the plethora of companies and the patchwork exploration that occurred as a result of the 1973 staking war, much of the earliest exploration work on what now constitutes the Ambler Schist belt was lost during the post-1980 hiatus in district exploration. The following subsections outline the best documented data at the Arctic Deposit as summarized in the 1998 Kennecott exploration report, including the assembled computer database; however, this outline is not considered to be either exhaustive or in depth.
In 1982, geologists with Kennecott, Anaconda and the State of Alaska published the definitive geologic map of the Ambler schist belt (Hitzman et al. 1982).
Table 6.1 lists known exploration mapping, geochemical, and geophysical programs conducted for VMS targets in the Ambler District.
NovaCopper Inc. | 6-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 6.1 Known Mapping, Geochemical, and Geophysical Programs Targeting VMS Prospects in the Ambler Mining District
Area | Prospects | Company | Mineralization | Mapping | Soil Geochem | Geophysics | Reports |
Arctic Center of the Universe (COU) Back Door
| Arctic
| BCMC-KEX
| Two (or more) sulfide bands with thickness up to ~40 m with Zn, Cu, Pb, Ag, Au, ±Ba mineralization.
| Proffett 1998; Lindberg and others 2004, 2005; NG personnel 2008 at 1:2,000 scale
| Extensive 2006 NG program (>670 samples)
| Numerous surveys including the 1998 Dighem EM and Mag aerial surveys, 1998 CSAMT survey, TEM downhole and surface surveys in 2005, TDEM ground survey in 2006 | Numerous
|
COU Back Door, 4th of July Creek | NG-Anaconda
| No exposed or drilled mineralization, target is the projection of the Arctic horizon | NG 1:2,000 mapping in 2006
| Extensive 2006 NG program
| 4 TDEM ground surveys in 2005 and 2006
| 2005 and 2006 NG Progress Reports; Lindberg's 2005 report
|
Sunshine Bud CS
| Sunshine Creek
| BCMC and BCMC- Noranda
| Disseminated to semi- massive lens up to 18 m thick. Upper mineralized limb is Ba-rich
| BCMC 1983; Paul Lindberg 2006; NG 2011
| Numerous eras of soil sampling, most recent 1998 by Kennecott (Have data) and 2006 by NG | BCMC completed Recon IP survey and Crone vertical shoot back EM in 1977, 2 TDEM surveys to the NW | Various BCMC reports; Lindberg's 2006 Sunshine progress report; 2006 NG Progress report
|
Bud-CS
| SMC and TAC
| Au-rich gossan and 3+ m intercept of 1.7% Cu, 0.4% Pb, 1.5% Zn, 2 oz/ton Ag, 0.017 oz/ton Au | Anaconda (TAC) and Sunshine (SMC)
| SMC soil sampling
| Anaconda completed downhole resistivity survey in 1981 on Bud 7 | 1981 through 1983 Anaconda Progress reports
|
Dead Creek Shungnak SK
| Shungnak (Dead Creek)
| BCMC, Cominco
| Thin (0.1 to 3 m) disseminated to semi- massive lenses of Cu, Zn, Pb, Ag mineralization | Bruce Otto and others 2006; Proffett 1998
| NG in 2006 (355 samples); KEX in 1998 (~240 samples)
| At lE 2 CEM surveys by BCMC at DH with no anomalous responses (do not have data) | 2006 NG report; 1982 and 1983 Anaconda Ambler Progress reports
|
table continues…
NovaCopper Inc. | 6-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
Area | Prospects | Company | Mineralization | Mapping | Soil Geochem | Geophysics | Reports |
Dead Creek Shungnak SK(con’t) | SK
| GCO and BCMC/GCO- HOMEX JV | Mineralized float up to 0.4% Cu, 4.8% Pb, 8.7% Zn, 5 oz/ton Ag | BCMC
| BCMC 1982 soil grid
| CEM and Max-min completed by BCMC (do not have data) | 1982 Annual Progress Report, BCMC; Bruce Otto 2006 Memo |
Horse Cliff DH
| Horse-Cliff DH
| Horse - BCMC, Cliff SMC, DH - BCMC and BCMC/GCO- HOMEX
| Disseminate to semi- massive with local massive lens, thicknesses up to tens of feet.
| KEX 1983 1:1000 prospect map
| SMC soil surveys 1976-1978 and 1980
| No known ground based survey; occurrences within a large resistivity high
| 1985 Progress Report BCMC-GCO-Homex J; 1980 Summary of Ambler Field Investigations - Sunshine Mining, Horse Creek Memo - Robinson 1981; 1978 Ellis Geologic Evaluation and Assessment of the Nern Belt Claims |
Snow Ambler RB Nani Frost
| Snow
| Cominco
| Ag-Pb-Zn mineralization as massive and semi- massive bands hosted within thin bands of graphitic schist (GS).
| Noranda- Cominco scanned map with no georeference; Prospect scale
| KEX Soil gird in 1997 or 1998
| No known ground based survey; Anaconda completed downhole resistivity survey in 1981 on Ambler-4 | “Snow Prospect Miscellaneous Notes and Maps.pdf” is only known report
|
Ambler
| Anaconda TAC
| Massive disseminated chalcopyrite and pyrite associated with chert
| Numerous Anaconda geologists; no digitized maps
| Only scattered soils in database
| Max-min surveys, no data is available
| 1983 Ambler River Memo (Sunshine Progress Report); 1982 Anaconda Progress Report |
Nani-Frost
| BCMC and BCMC- Noranda
| Outcrops of 2-3 m of 0.8% Cu, 0.4% Pb, 1.2% Zn, 0.05 oz/ton Ag within felsic schist | BGMC (do not have data)
| BCMC identified numerous weak soil anomalies (do not have data) | CEM, Max-min, and PEM completed by BCMC (do not have data) | 1982 Annual Progress Report, BCMC
|
table continues…
NovaCopper Inc. | 6-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
Area | Prospects | Company | Mineralization | Mapping | Soil Geochem | Geophysics | Reports |
Red Nora
| Nora
| BCMC/GCO- HOMEX
| Disseminated chalcopyrite within chlorite altered volcanics in two zones (Sulphide Gulch and Nern Horizon) | Generalized geologic map created by WGM for BCMC- GCO- HOMEX
| No known data
| Two PEM over the Sulphide Gulch horizon
| 1984 and 1985 Progress Report BCMC- GCO-Homex JV
|
Red
| BCMC
| Thin discordant bands of sphalerite, chalcopyrite, galena, and pyrrhotite with calcite and fluorite cutting 'siltites' and metacarbonates
| None
| KEX soil lines 1998
| KEX identified EM anomalies 1998, follow-up gravity and Max- min EM; TDEM survey in 2006; DIGHEM helicopter EM and radiometric survey in 2006 | Kennecott's final 1998 field report; 2006 NG Progress Report
|
Other
| BT, Jerri Creek
| Anaconda, AMC
| Massive sulphide bands up to 1.5 m thick extend nearly 2.3 km along an E-W strike
| Hitzman and others
| Historic soils at Jerri Creek
| No known surveys.
| Hitzman thesis and Anaconda (BT) and Bear Creek (Jerri) Assessment reports; 1982 and 1983 Anaconda Ambler Progress reports |
Kogo- White Creek
| Bud - SMC or AMC
| Discovered by hydrochemistry of high Cu ions in White Creek.
| SMC?
| Soil geochem surveys by SMC in 1978 and KEX in 1998
| Recon IP survey in 1977; Max-Min Mag survey in 1980; Follow-up Max-Min and gravity by KEX in 1998; TDEM by NG in 2006. | 1980 Summary of Ambler Field Investigations, SMC; Kennecott's Final 1998 Field Report
|
Pipe
| BCMC and SMC
| Podiform zones of sulphide mineralization within calc-schists and QMS | Schmidt in 1978, SMC in 1982
| Kennecott soil grid in 1997-1998
| Not known
| Schmidt's 1978 report (Part IV) for Anaconda's (?) annual report
|
table continues…
NovaCopper Inc. | 6-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
Area | Prospects | Company | Mineralization | Mapping | Soil Geochem | Geophysics | Reports |
Other (con’t)
| Tom Tom
| Anaconda and SMC
| 1982 'Discovery' trench by SMC uncovered massive sulphide boulders with up to 6 oz/ton Ag, 5.4% Pb, 6.3% Zn, only 0.2% Cu | Sunshine in 1982 (?)
| SMC soils in 1982
| Gamma mag survey by SMC in 1982; TDEM by NG in 2006.
| 1982 Sunshine Mining Company Memo by E.R. Modroo; Schmidt's 1978 report (Part IV) for Anaconda's (?) annual report
|
Sun
| Sun-Picnic Creek
| Anaconda - AMC-Cominco; Andover is current owner
| Three (?) zones of sulphide mineralization varying from 1 to 10 m; Upper zone is Zn-Pb-Ag rich while the two lower zones are Cu rich | Various Anaconda geologists
| Not known, but most likely extensive
| Not known, but most likely extensive
| 1981 Anaconda progress report; Anaconda 1977 prefeasibility study (not in NG possession)
|
Smucker
| Smucker- Charlie- Puzzle-4B- Patti
| Anaconda, Cominco, and Bear Creek; now owned by Teck
| A single mineralized Ag-Zn-Pb-Cu horizon varying from 1 to 8 m in thickness
| Detailed mapping by Anaconda and GCMC geologists
| Strong soil geochem anomalies in lowlands SE of Smucker horizon; Kennecott soil grid in 1997 or 1998 | Not known
| 1985 Progress Report BCMC- GCO-Homex JV
|
Note: EM = electromagnetic; TDEM = time domain electromagnetic; CSAMT = Controlled Source Audio Magnetotelluric
NovaCopper Inc. | 6-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Historic geochemistry for the district, compiled in the 1998 Kennecott database, includes 2,255 soil samples, 922 stream silt samples, 363 rock samples, and 37 panned concentrate samples. Data has been sourced from several companies including Kennecott, Sunshine Mining, RAA, and NANA. Sourcing of much of the data had been poorly documented in the database.
During 1998, Kennecott renewed its effort in the district, and, as a follow-up to the 1998 EM survey, undertook directed soil and rock chip sampling in and around EM anomalies generated in the geophysical targeting effort. During this period Kennecott collected 962 soils and 107 rocks and for the first time used extensive multi-element inductively coupled plasma (ICP) analysis.
Prior to 1998, Kennecott conducted a series of geophysical surveys which are poorly documented or are unavailable to NovaCopper. With the renewed interest in the belt, Kennecott mounted a largely geophysically driven program to assess the district for Arctic-sized targets. Based on an initial review of earlier geophysical techniques employed at the Arctic Deposit, Kennecott initiated an extensive helicopter-supported airborne EM and magnetic survey covering the entire VMS belt in March 1998. The survey was conducted on 400 m line spacing with selective 200 m line spacing at the Arctic Deposit and covered 2,509 total line kilometres. The Arctic Deposit presented a strong 900 Hz EM conductive signature.
Forty-six additional discrete EM conductors were identified, of which, 17 were further evaluated in the field. Eight of the EM anomalies were coincident with anomalous geochemistry and prospective geology, and were deemed to have significant potential for mineralization. As a follow-up, each anomaly was located on the ground using a Maxmin 2 horizontal loop EM system. Gravity lines were subsequently completed utilizing a LaCoste and Romberg Model G gravimeter over each of the eight anomalies.
In addition to the EM and gravity surveys in 1998, five lines of CSAMT data were collected in the Arctic Valley. The Arctic Deposit showed an equally strong conductive response in the CSAMT data as was seen in the EM data. As a result of the survey, Kennecott recommended additional CSAMT for the deposit area.
Field targeting work in 1998 prompted Kennecott to drill two exploration holes on anomaly 98-3, located approximately 6 km northwest of the Arctic Deposit and 2 km east-northeast of the Dead Creek prospect. Hole 98-03-01 was drilled to test the sub-cropping gossan and was roughly coincident with the centre of the geophysical anomaly as defined by airborne and ground EM data. Scattered mineralization was encountered throughout the hole with intervals of chalcopyrite and sphalerite.
Based on the results of the 1998 geophysical program, Kennecott made the following recommendations:
NovaCopper Inc. | 6-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | anomaly 98-3 requires further drilling |
| | |
| • | anomalies 98-7 and 98-22 are drill ready |
| | |
| • | anomalies 98-8, -9, -14, -35, and - 38 require additional ground targeting. |
Kennecott conducted no further field exploration in the district after 1998 and subsequently optioned the property to NovaGold in 2004.
Between 1967 and July 1985, Kennecott (BCMC) completed 86 holes (including 14 large diameter metallurgical test holes) totalling 16,080 m. In 1998, Kennecott drilled an additional 6 core holes totalling 1,492 m to test for:
| • | extensions of the known Arctic resource |
| | |
| • | grade and thickness continuity |
| | |
| • | EM anomaly 98-3. |
Drilling for all BCMC/Kennecott campaigns in the Arctic Deposit area (1966 to 1998) totals 92 core holes for a combined 17,572 m. A complete and comprehensive discussion of the all the drilling undertaken at the Arctic Deposit is contained in Section 10.0 of this report.
Prior to 1998, no specific gravity (SG) measurements were available for the Arctic Deposit rocks. A “factored” average bulk density was used to calculate a tonnage factor for resource estimations. A total of 38 samples from the 1998 drilling at the Arctic Deposit were measured for SG determinations. This included six samples of unaltered metavolcanics, ten samples of graphitic schist and talc schist lithology, seven samples of SMS, and 15 samples of MS.
A complete and comprehensive discussion of SG determinations captured during both the Kennecott and NovaCopper/NovaGold tenures are discussed in Sections 11.0 and 14.0 of this report.
6.2.6 | PETROLOGY, MINERALOGY, AND RESEARCH STUDIES |
There have been numerous internal studies done by Kennecott on the petrology and mineralogy of the Arctic Deposit that exist as internal memos, file notes, and reports from as early as 1967. Most notable are Clark et al. 1972; Clark et al. 1976; Hunt 1999; Stephens et al. 1970; and Stevens 1982.
In addition, Jeanine Schmidt completed a doctoral dissertation for Stanford University in 1983 entitled “The Geology and Geochemistry of the Arctic Prospect, Ambler District, Alaska”.
NovaCopper Inc. | 6-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
6.2.7 | GEOTECHNICAL, HYDROLOGICAL AND ACID-BASE ACCOUNTING STUDIES |
A series of geotechnical, hydrological and acid-base accounting (ABA) studies were conducted by Kennecott before their divestiture of the Arctic Project to NovaGold.
GEOTECHNICALSTUDIES
In December 1998, URSA Engineering prepared a geotechnical study for Kennecott titled “Arctic Project – 1998 Rock Mass Characterization”. Though general in scope, the report summarized some of the basic rock characteristics as follows:
| • | Compressive strengths average 6,500 psi for the quartz mica schists, 14,500 psi for the graphitic schists, and 4,000 psi for talc schists. |
| | |
| • | Rock mass quality can be described as average to good quality, massive with continuous jointing except the talc schist, which was characterized as poor quality. The rock mass rating (RMR) averages 40 to 50 for most units except the talc schist which averages 30. |
HYDROLOGICALSTUDIES
In 1998, Robertson Geoconsultants Inc. (Robertson) of Vancouver prepared a report for Kennecott titled “Initial Assessment of Geochemical and Hydrological Conditions at Kennecott’s Arctic Project”. The report presented the results of the acid generation potential of mine waste and wall rock for the Arctic Project in the context of a hydrological assessment of the climate, hydrology and water balance analyses at the Arctic Deposit. Climatic studies at the time were limited to regional analyses as no climatic data had been collected at the Arctic Project site prior to the review. Regional data, most specifically a government installed gauging station about 20 miles to the southwest at Dahl Creek, provided information in assessing the hydrology of the Arctic Project at the time. A total of nine regional gauges were utilized to evaluate the overall potential runoff in the area.
ACID-BASEACCOUNTINGSTUDIES
The 1998 Robertson study documented acid-base accounting results based on the selection of 60 representative core samples from the deposit. Results of the study are summarized as follows:
| • | Roughly 70% of the waste rock material was deemed to be PAG. |
| | |
| • | Mitigation of the acid generating capacity could be affected by submersion of the waste rock. Mitigation of the high wall and pit geometries would make potential pit flooding unlikely and could present a long term mitigation issue. |
| | |
| • | Characteristics of the mine tailings were not assessed. |
| | |
| • | Based on the study, Robertson recommended underground mining scenarios, or aggressive study including site water balance. |
NovaCopper Inc. | 6-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
6.2.8 | METALLURGICAL STUDIES |
During Kennecott’s tenure on the Property, they undertook an extensive series of studies regarding the metallurgy and processing of the Arctic mineralization. An extensive discussion of the historic and current metallurgical studies is presented in Section 13.0 of this report.
6.3 | HISTORICAL MINERAL RESOURCE ESTIMATES |
A series of historic mineral resources have been estimated for the Arctic Deposit, including Russell (1975), Brown (1985), Randolf (1990), Kennecott (1995).
The historic resource estimates are considered relevant but not necessarily reliable. In each case, a significant amount of resampling and verification is required to upgrade or verify the historical estimate as current mineral resources or mineral reserves. Please note that a QP has not done sufficient work to classify any of the historical estimates as current mineral resources or mineral reserves and the issuer is not treating the historical estimates as current mineral resources or mineral reserves.
6.3.1 | RUSSELL – KENNECOTT (1975/1976) RESOURCE ESTIMATE |
| The oldest documented estimate is a mineral resource estimated by R.H. Russell in 1975 for Kennecott. This employed a polygonal estimation method. The estimate was updated in 1976 after additional drilling, and constrained within an open -pit mining scenario, with minimum 5 ft blocks with greater than 1% copper cut-off. Equivalencies for cut-off calculations include 5.56% zinc equalling 1% copper, and 2.21 oz/ton silver equalling 1% copper. The estimation utilized a tonnage factor of 8.81 ft3per ton. Table 6.2 summarizes the results of the Russell estimation. This historical estimate is not categorized, and it is not known what the equivalent CIM category would be. |
| |
| Table 6.2Russell 1976 Resource Estimation |
Million Tons | Copper (%) | Zinc (%) | Lead (%) | Silver (oz/ton) | Gold (oz/ton) | Basis |
36.8
| 3.97
| 5.49
| 0.78
| 1.60
| 0.019
| Tonnage Factor = 8.81 Cut-off 5 ft of >1% CuEq |
Note: CuEq = copper equivalent
6.3.2 | BROWN – KENNECOTT (1985) RESOURCE ESTIMATE |
In a 1985 economic study, Brown reports resources based on a polygonal method at 4%, 6%, 8%, and 10% polymetallic cut-offs (copper + zinc + 1/2 lead), using 8 ft minimum mining heights, elevations above 2,300 ft, and 10 to 14% dilution factors. In addition, the resource reports additional resources below 2,300 ft elevation at 6% and 8% cut-offs. The resource is based on zones of mineralization ranging from 8 to 40 ft thick covering an area of 2,400 by 2,800 ft. Table 6.3 summarizes results of the Brown estimation.
NovaCopper Inc. | 6-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| This historical estimate is not categorized, and it is not known what the equivalent CIM category would be. |
| |
| Table 6.3Brown 1985 Resource Estimation |
Million Tons | Copper (%) | Zinc (%) | Lead (%) | Silver (oz/ton) | Gold (oz/ton) | Basis |
8.8 | 4.70 | 8.30 | 1.15 | 2.00 | 0.026 | 8% cut-off (Cu+Zn+1/2Pb) + 12.7% dilution |
3.9 | 4.04 | 6.82 | 1.17 | 1.90 | 0.023 | Additional tonnage below 2300 ft elevation |
5.2 | 3.00 | 2.35 | 0.35 | - | - | Additional tonnage 4 to 8% cut-off |
6.3.3 | RANDOLF – KENNECOTT (1990) RESOURCE ESTIMATE |
Another documented Kennecott resource is by Randolf (1990), who completed an updated economic evaluation of the Property, based on exploration drilling completed through 1975. No supporting data or discussion of the basis for the mineral resource estimation is presented. Table 6.4 summarizes results of the Randolf estimate. This historical estimate is not categorized, and it is not known what the equivalent CIM category would be.
Table 6.4 Randolf 1990 Resource Estimation
Million Tons | Copper (%) | Zinc (%) | Lead (%) | Silver (oz/ton) | Gold (oz/ton) | Basis |
36.8 | 3.70 | 5.05 | 0.75 | 1.60 | 0.02 | Unknown |
6.3.4 | KENNECOTT (1995) RESOURCE ESTIMATE |
The most widely repeated historic mineral resource number is the updated 1995 Kennecott resource, produced in conjunction with the construction of the digital database for the Arctic Project. No supporting data or discussion of the basis of the resource estimation is presented. Table 6.5 summarizes the results of the 1995 estimate. This historical estimate is not categorized, and it is not known what the equivalent CIM category would be.
Table 6.5 Kennecott 1995 Resource Estimation
Million Tons | Copper (%) | Zinc (%) | Lead (%) | Silver (g/ton) | Gold (g/ton) | Basis |
36.3 | 4.0 | 5.5 | 0.8 | 54.9 | 0.7 | Unknown |
NovaCopper Inc. | 6-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
6.3.5 | DEAD CREEK, SUNSHINE AND HORSE CLIFF HISTORICAL RESOURCES |
There are a number of other prospects within the Arctic Project boundary, covering the permissive Ambler Sequence. Three of the prospects (Dead Creek, Sunshine and Horse Cliff) have historical resources, as listed in Table 6.6.
Table 6.6 Historical Resources for the Dead Creek, Sunshine and Horse Cliff Prospects
Area | Resource (Mt) | Status | Cu (%) | Zn (%) | Pb (%) | Ag (g/t) |
Dead Creek | 1.0 | Historical | 3.0 | 3.0 | 2.0 | 46.6 |
Sunshine | 20.0 | Historical | 1.4 | 2.5 | 0.5 | 24.8 |
Horse Cliff | 10.0 | Historical | 1.5 | 4.5 | 1.5 | 31.3 |
6.4 | DEVELOPMENT STUDIES |
| |
6.4.1 | KENNECOTT TENURE |
During Kennecott’s tenure on the Arctic property, no less than 10 different economic studies were completed internally. These studies include: J.L. Halls, 1974, “Ambler District Evaluation”; J.L. Halls, 1976, “Arctic Deposit Order of Magnitude Evaluation”; P.A. Metz, 1978, “Arctic Prospect Summary File Report”; J.L. Halls, 1978, “Arctic Deposit”; C.D. Broadbent, 1981, “Evaluation of the Arctic and Ruby Creek Deposits”; R.R. Dimrock, 1984, “Evaluation Update”; W.J. Brown, 1985, “Pre-AFD Report”; M.P. Randolf, 1990, “Re-Evaluation”; W.L. Jacobsen, 1997, “Arctic Project Mining Potential”; and J. Earnshaw, 1999, “Interim Report Conceptual Level Economic Evaluations of the Arctic Resource”. In addition to the internal studies, SRK completed a “Preliminary Arctic Scoping Study” in 1998 at the request of Kennecott.
The internal studies contemplated both open pit and underground mining scenarios at a variety of the production rates with prevailing metals pricing, capital and operating costs. The studies also targeted a variety of transportation options including roads to both Cape Krusenstern (north of Kotzebue) and Cape Darby on the Seward Peninsula, as well as railroad options to Cape Krusenstern and Whittier. Two studies also evaluated the air transport of concentrate and supplies. The SRK external study only contemplated various underground mining scenarios and did not address high-level economics.
NovaCopper Inc. | 6-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
7.0 | GEOLOGICAL SETTING AND |
| MINERALIZATION |
7.1 | REGIONAL GEOLOGY–SOUTHERN BROOKS RANGE |
The Ambler mining district (Ambler District) occurs along the southern margin of Brooks Range within an east-west trending zone of Devonian to Jurassic age submarine volcanic and sedimentary rocks (Hitzman et al. 1986). The district covers both: 1) VMS-like deposits and prospects hosted in the Devonian age Ambler Sequence (or Ambler Schist belt), a group of metamorphosed bimodal volcanic rocks with interbedded tuffaceous, graphitic and calcareous volcaniclastic metasediments; and 2) epigenetic carbonate-hosted copper deposits occurring in Devonian age carbonate and phyllitic rocks of the Bornite Carbonate Sequence. The Ambler Sequence occurs in the upper part of the Anirak Schist, the thickest member of the Schist belt or Coldfoot subterrane (Moore et al. 1994). VMS-like stratabound mineralization can be found along the entire 110 km strike length of the district. Immediately south of the Schist belt in the Cosmos Hills, a time equivalent section of the Anirak Schist includes the approximately 1 km thick Bornite Carbonate Sequence. Mineralization of both the VMS-like deposits of the Schist belt and the carbonate-hosted deposits of the Cosmos Hills has been dated at 375 to 387 Ma (Selby et al. 2009; McClelland et al. 2006).
In addition, the Ambler District is characterized by increasing metamorphic grade north perpendicular to the strike of the east-west trending units. The district shows isoclinal folding in the northern portion and thrust faulting to south (Schmidt 1983). The Devonian to Mississippian age Angayucham basalt and the Triassic to Jurassic age mafic volcanic rocks are in low-angle over thrust contact with various units of the Ambler Schist belt and Bornite Carbonate Sequence along the northern edge of the Ambler Lowlands.
7.1.1 | TERRANE DESCRIPTIONS |
The terminology of terranes in the southern Brooks Range evolved during the 1980s because of the region’s complex juxtaposition of rocks of various composition, age and metamorphic grade. Hitzman et al. (1986) divided the Ambler District into the Ambler and Angayucham terranes. Recent work (Till et al. 1988; Silberling et al. 1992; Moore et al. 1994) includes the rocks of the previously defined Ambler terrane as part of the regionally extensive Schist belt or Coldfoot subterrane along the southern flank of the Arctic Alaska terrane as shown in Figure 7.1 (Moore et al. 1994). In general, the southern Brooks Range is composed of east-west trending structurally bound allochtons of variable metasedimentary and volcanogenic rocks of Paleozoic age.
NovaCopper Inc. | 7-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure7.1 Geologic Terranes of the Southern Brooks Range
The Angayucham terrane, which lies along southern margin of the Brooks Range, is locally preserved as a klippen within the eastern Cosmos Hills and is composed of weakly metamorphosed to unmetamorphosed massive-to-pillowed basalt rocks with minor radiolarian cherts, marble lenses and isolated ultramafic rocks. This package of Devonian to Late Triassic age (Plafker et al. 1977) mafic and ultramafic rocks is interpreted to represent portions of an obducted and structurally dismembered ophiolite that formed in an ocean basin south of the present day Brooks Range (Hitzman et al. 1986; Gottschalk and Oldow 1988). Locally, the Angayucham terrane overlies the schist belt to the north along a poorly exposed south-dipping structure.
Gottschalk and Oldow (1988) describe the Schist belt as a composite of structurally bound packages composed of dominantly greenschist facies rocks, including pelitic to semi-pelitic quartz-mica schist with associated mafic schists, metagabbro and marbles. Locally, the Schist belt includes the middle Devonian age Bornite Carbonate Sequence, the lower Paleozoic age Anirak pelitic, variably siliceous and graphic schists, and the mineralized Devonian age Ambler sequence consisting of volcanogenic and siliciclastic rocks variably associated with marbles, calc-schists, metabasites and mafic schists (Hitzman et al. 1982; Hitzman et al. 1986). The lithologic assemblage of the Schist belt is consistent with an extensional, epicontinental tectonic origin.
Structurally overlaying the Schist belt to the north is the Central belt. The Central belt is in unconformable contact with the Schist belt along a north-dipping low-angle structure (Till et al., 1988). The Central belt consists of lower Paleozoic age metaclastic and carbonate rocks, and Proterozoic age schists (Dillon et al. 1980). Both the Central belt and Schist belt are intruded by meta-to-peraluminous orthogneisses, which locally yield a slightly discordant U-Pb thermal ionization mass spectrometry (TIMS) zircon crystallization age of middle to late Devonian (Dillon et al. 1980; Dillon et al. 1987). This igneous protolith age is supported by Devonian orthogneiss ages obtained along the Dalton Highway, 161 km to the east of the Ambler District (Aleinikoff et al. 1993).
NovaCopper Inc. | 7-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Overlaying the Schist belt to the south is the Phyllite belt, characterized in the Ambler mining district as phyllitic black carbonaceous schists of the Beaver Creek Phyllite which is assumed to underlie much of the Ambler Lowlands between the Brooks Range and the Arctic Deposit to the north and the Cosmos Hills and the Bornite Deposit to the south. The recessive weathering nature of the Beaver creek phyllite limits the exposure but is assumed to occur as a thrust sheet overlying the main Schist belt rocks.
7.1.2 | REGIONAL TECTONIC SETTING |
Rocks exposed along the southern Brooks Range consist of structurally bound imbricate allochtons that have experienced an intense and complex history of deformation and metamorphism. Shortening in the fold and thrust belt has been estimated by some workers to exceed 500 km (Oldow et al. 1987) based on balanced cross sections across the central Brooks Range. In general, the metamorphic grade and tectonism in the Brooks Range increases to the south and is greatest in the Schist belt. The tectonic character and metamorphic grade decreases south of the Schist belt in the overlaying Angayucham terrane.
In the late Jurassic to early Cretaceous age, the Schist belt experienced penetrative thrust-related deformation accompanied by recrystallization under high-pressure and low-temperature metamorphic conditions (Till et al. 1988). The northward directed compressional tectonics were likely related to crustal thickening caused by obduction of the Angayucham ophiolitic section over a south-facing passive margin. Thermobarometry of schists from the structurally deepest section of the northern Schist belt yield relict metamorphic temperatures of 475°C, ±35°C, and pressures from 7.6 to 9.8 kb (Gottschalk and Oldow 1988). Metamorphism in the schist belt grades from lowest greenschist facies in the southern Cosmos Hills to upper greenschist facies, locally overprinting blueschist mineral assemblages in the northern belt (Hitzman et al. 1986).
Compressional tectonics, which typically place older rocks on younger, do not adequately explain the relationship of young, low-metamorphic-grade over older and higher-grade metamorphic rocks observed in the southern Brooks Range hinterland. Mull (1982) interpreted the Schist belt as a late antiformal uplift of the basement to the fold and thrust belt. More recent models propose that the uplift of the structurally deep Schist belt occurred along duplexed, north-directed, thin-skinned thrust faults, followed by post-compressional south-dipping low angle normal faults along the south flank of the Schist belt, accommodating for an over-steepened imbricate thrust stack (Gottschalk and Oldow 1988; Moore et al. 1994). Rapid cooling and exhumation of the Schist belt began at the end of the early Cretaceous age at 105 to 103 Ma, based on Ar40/Ar39 cooling ages of hornblende and white mica near Mount Igikpak, and lasted only a few million years (Vogl et al. 2002). Additional post extension compressive events during the Paleocene age further complicate the southern Brooks Range (Mull 1985).
NovaCopper Inc. | 7-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
7.2 | AMBLER SEQUENCE GEOLOGY |
Rocks that form the Ambler Sequence consist of a lithologically diverse sequence of lower Paleozoic Devonian age carbonate and siliciclastic strata with interlayered mafic lava flows and sills. The clastic strata, derived from terrigenous continental and volcanic sources, were deposited primarily by mass-gravity flow into the sub-wavebase environment of an extending marginal basin.
The Ambler Sequence underwent two periods of intense, penetrative deformation. Sustained upper greenschist-facies metamorphism with coincident formation of a penetrative schistosity and isoclinal transposition of bedding marks the first deformation period. Pervasive similar-style folds on all scales deform the transposed bedding and schistosity, defining the subsequent event. At least two later non-penetrative compressional events deform these earlier fabrics. Observations of the structural and metamorphic history of the Ambler District are consistent with current tectonic evolution models for the Schist belt, based on the work of others elsewhere in the southern Brooks Range (Gottschalk and Oldow 1988; Till et al. 1988; Vogl et al. 2002).
Figure 7.2 shows the location and geology of the Ambler mining district and the Schist belt terrane including the Anirak schist, the Kogoluktuk schist and the Ambler Sequence, the contemporaneous Bornite Carbonate Sequence in the Cosmos Hills to the south, and the allochthonous overthrust Cretaceous sedimentary rocks and Devonian Angayucham volcanic rocks.
NovaCopper Inc. | 7-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 7.2 Geology of the Ambler Mining District
7.2.1 | GENERAL STRATIGRAPHY OF THE AMBLER SEQUENCE |
Though the Ambler Sequence is exposed over 110 km of strike length descriptions and comments herein will refer to an area between the Kogoluktuk River on the east and the Shungnak River on the west where NovaCopper has focused the majority of its exploration efforts over the last decade.
The local base of the Ambler Sequence consists of variably metamorphosed carbonates historically referred to as the Gnurgle Gneiss. NovaCopper interprets these strata as calc-turbidites, perhaps deposited in a sub-wavebase environment adjacent to a carbonate bank. Calcareous schists overlie the Gnurgle Gneiss and host sporadically distributed mafic sills and pillowed lavas. These fine-grained clastic strata indicate a progressively quieter depositional environment up section, and the presence of pillowed lavas indicates a rifting, basinal environment.
Overlying these basal carbonates and pillowed basalts is a section of predominantly fine-grained carbonaceous siliciclastic rocks which host a significant portion of the mineralization in the district including the Arctic Deposit. This quiescent section indicates further isolation from a terrigenous source terrain.
The section above the Arctic Deposit host stratigraphy contains voluminous reworked silicic volcanic strata with the Button Schist at its base. The Button Schist is a regionally continuous and distinctive albite porphyroblastic unit that serves as an excellent marker above the main mineralized stratigraphy. The paucity of volcanically derived strata below the Arctic Deposit host section and abundance above indicates that the basin and surrounding hinterlands underwent major tectonic reorganization during deposition of the Arctic Deposit section. Greywacke sands that NovaCopper interpret as channeled high-energy turbidites occur throughout the section but concentrate high in the local stratigraphy. Figure 7.3 shows idealized sections for several different areas in and around the Arctic Deposit.
NovaCopper Inc. | 7-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Several rock units show substantial change in thickness and distribution in the vicinity of the Arctic Deposit that may have resulted from the basin architecture existing at the time of deposition. Between the Arctic Ridge, geographically above the Arctic Deposit, and the Riley Ridge to the west several significant differences have been documented including:
| • | The Gnurgle Gneiss is thickest in exposures along the northern extension of Arctic Ridge and appears to thin to the west. |
| | |
| • | Mafic lavas and sills thicken from east to west. They show thick occurrences in upper Subarctic Creek and to the west, but are sparsely distributed to the east. |
| | |
| • | The quartzite section within and above the Arctic sulphide horizon does not occur in abundance east of Arctic Ridge; it is thicker and occurs voluminously to the west. |
| | |
| • | Button Schist thickens dramatically to the west from exposures on Arctic Ridge; exposures to the east are virtually nonexistent. |
| | |
| • | Greywacke sands do not exist east of Subarctic Creek but occur in abundance as massive, channeled accumulations to the west, centered on Riley Ridge. |
These data are interpreted by NovaCopper to define a generally north-northwest-trending depocentre through the central Ambler District. Diamictite occurrences described below in concert with these formational changes suggest that the depocentre had a fault-controlled eastern margin. The basin deepened to the west; the Riley Ridge section deposited along a high-energy axis, and the COU section lies to the west-southwest distally from a depositional energy point of view. This original basin architecture appears to have controlled mineralization of the sulphide systems at Ambler and Shungnak (Dead Creek), concentrating fluid flow along structures on the eastern basin margin.
Figure 7.4 is a simplified geologic map of the area between the Kogoluktuk and the Shungnak rivers.
NovaCopper Inc. | 7-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure7.3 Ambler Sequence Stratigraphy in the Arctic Deposit Area
NovaCopper Inc. | 7-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure7.4 Generalized Geology of the Central Ambler District
NovaCopper Inc. | 7-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
7.2.2 | STRUCTURAL FRAMEWORK OF THE AMBLER DISTRICT |
In addition to the underlying pre-deformational structural framework of the district suggested by the stratigraphic thickening of various facies around the Arctic Deposit, the Ambler Sequence is deformed by two penetrative deformational events that significantly complicate the distribution and spatial arrangement of the local stratigraphy.
F1DEFORMATION
The earliest penetrative deformation event is associated with greenschist metamorphism and the development of regional schistosity. True isoclinal folds are developed and fold noses typically are thickened. The most notable F1 fold is the Arctic antiform that defines the upper and lower limbs of the Arctic Deposit. The fold closes along a north-northeast- trending fold axis roughly mimicking the trace of Subarctic Creek and opening to the east. Importantly, the overturned lower limb implies that the permissive stratigraphy should be repeated on a lower synformal isocline beneath the currently explored limbs and would connect with the permissive mineralized stratigraphy to the northwest at Shungnak (Dead Creek). Figure 7.5 shows typical F1 folds developed in calcareous Gnurgle Gneiss.
Figure7.5 Typical F1 Isoclinal Folds Developed in Calcareous Gnurgle Gneiss
NovaCopper Inc. | 7-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
F2 DEFORMATION
The earlier F1 schistosity is in turn deformed by the F2 deformational event that resulted in the local development of an axial planar cleavage. The deformational event is well defined throughout the Schist belt and results in a series of south verging open to moderately overturned folds that define a series of east-west trending folds of similar vergence across the entire Schist belt stratigraphies.
This event is likely temporarily related to the emplacement of the Devonian Angayucham volcanics, the obducted Jurassic ophiolites and Cretaceous sediments over the Schist belt stratigraphies.
In addition to the earlier penetrative deformation events, a series of poorly defined non-penetrative deformation likely as a consequence of Cretaceous extension are seen as a series of warps or arches across the district.
The interplay between the complex local stratigraphy, the isoclinal F1 event, the overturned south verging F2 event and the series of post-penetrative deformational events makes district geological interpretation often extremely difficult at a local scale.
7.3 | ARCTIC DEPOSIT GEOLOGY |
Previous workers at the Arctic Deposit (Russell 1995 and Schmidt 1983) describe three mineralized horizons at the Arctic Deposit: the Main Sulphide Horizon, the Upper South Horizon and the Warm Springs Horizon. The Main Sulphide Horizon was further subdivided into three zones: the southeast zone, the central zone and the northwest zone. Previous deposit modelling was grade-based resulting in numerous individual mineralized zones representing relatively thin sulphide horizons.
Recent work by NovaCopper define the Arctic Deposit as two or more discrete horizons of sulphide mineralization contained in a complexly deformed isoclinal fold with an upright upper limb and an overturned lower limb hosting the main mineral resources. Nearby drilling suggests a third limb, an upright lower limb, likely occurs beneath the currently explored stratigraphy. Figure 7.6 is a generalized geologic map of the immediate Arctic Deposit area.
NovaCopper Inc. | 7-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure7.6 Generalized Geologic Map of the Arctic Deposit
7.3.1 | LITHOLOGIES AND LITHOLOGIC DOMAIN DESCRIPTIONS |
Historically, five lithologic groupings have been utilized by Kennecott (URSA Engineering 1998 and Russell 1995) to describe the local stratigraphy of the deposit. These groupings include: 1) metarhyolite (Button Schist) or porphyroblastic quartz feldspar porphyry and rhyolitic volcaniclastic and tuffaceous rocks; 2) quartz mica schists composed of tuffaceous and volcaniclastic sediments; 3) graphitic schists composed of carbonaceous sedimentary rocks; 4) base metal sulphide bearing schists; and 5) talc schists composed of talc altered volcanic and sedimentary rocks.
The principal lithologic units captured in logging and mapping by NovaCopper are summarized and described in the following subsections, in broadly chronologically order from oldest to youngest.
GREENSTONE (GNST)
Greenstones are typically massive dark-green amphibole- and garnet-bearing rocks, differentiated by their low quartz content and dark green color. Textural and colour similarities along with similar garnet components and textures often cause confusion with some sedimentary greywackes within the Ambler Sequence stratigraphy. Intervals of greenstone range up to 80 m in thickness and are identified as pillowed flows, sills and dikes. Multiple ages of deposition are implied as both basal pillowed units are present as well as intrusive sill and dike-like bodies higher in the local stratigraphy.
NovaCopper Inc. | 7-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
CHLORITE SCHIST (CHS)
This unit is likely alteration-related but has been used for rocks where more than half of the sheet silicates are composed of chlorite. In the field, some samples of chlorite schist showed a distinctive dark green to blue-green colour, but in drill core the chlorite schists commonly have lighter green colour. Some intervals of chlorite schist are associated with talc-rich units.
TALC SCHIST (TS)
Talc-bearing schists are often in contact with chlorite-rich units and reflect units which contain trace to as much as 10% talc often occurring on partings. Like the chlorite schist this unit is likely alteration related.
BLACK TO GREY SCHIST (GS)
Black or grey schists appear in many stratigraphic locations particularly higher in the stratigraphy but principally constitute the mineralized permissive stratigraphy of the Arctic Deposit lying immediately below the Button Schist (MRP). The unit is typically composed of muscovite, quartz, feldspar, graphite, and sometimes chlorite, biotite or sulphides. The texture is phyllitic, variably crenulated, well-foliated and suggests a pelitic protolith, likely deposited in a basin progressively filled with terrigenous fine sediment. This unit is host to the MS and SMS horizons that constitute the Arctic Deposit.
BUTTON SCHIST (MRP)
This rock type consists of quartz-muscovite-feldspar schists with abundant distinctive 1 to 3 cm albite porphyroblasts of metamorphic origin and occasional 0.5 to 2 cm blue quartz phenocrysts of likely igneous origin. The unit shows a commonly massive to weakly foliated texture, although locally the rocks have a well-developed foliation with elongate feldspars.
QUARTZ-MICA-(FELDSPAR) SCHIST (QMS/QFMS)
This schistose rock contains variable proportions of quartz, muscovite, and sometimes feldspar. Most contain high amounts of interstitial silica, and some have feldspar or quartz porphyroblasts. The texture of the unit shows significant variability and likely represent both altered and texturally distinct felsic tuffs and volcaniclastic lithologies.
DIAMICTITE (DIA)
This unit contains a range of unsorted, matrix supported polylithic clasts including Button Schist occurring in black to dark grey, very fine-grained graphitic schist. The unit occurs as lenses with other stratigraphies and likely represents local derived debris flows or slumps.
GREYWACKE (GW)
This unit consists of massive green rocks with quartz, chlorite, probably amphibole, feldspar, muscovite, and accessory garnet, biotite, and calcite/carbonate. Voluminous accumulations of medium-grained greywacke occur within, but generally above, the quartz mica schist and are differentiated from texturally similar greenstones by the presence of detrital quartz, fine-grained interbeds, graded bedding and flute casts.
NovaCopper Inc. | 7-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
LITHOGEOCHEMISTRY OF IMMOBILE TRACE ELEMENTS
In 2007, work by NovaGold suggested that many of the nondescript felsic metavolcanic lithologies were simply alteration and textural variants of the felsic rock units and not adequately capturing true compositional lithological differences between units. Twelker (2008) demonstrated that the use of lithogeochemistry utilizing immobile trace elements specifically Al2O3:TiO2 (aluminium oxide:titanium dioxide) ratios could be used to effectively differentiate between different felsic volcanic and sedimentary suites of rocks at the Arctic Deposit.
Lithogeochemistry shows three major felsic rock suites in the Arctic Deposit area: a rhyolite suite; and intermediate volcanic suite and a volcaniclastic suite. These suites are partially in agreement with the logged lithology but in some instances show that alteration in texture and composition masked actual lithologic differences.
Results of the lithogeochemistry have led to a better understanding of the stratigraphic continuity of the various units and have been utilized to more accurately model the lithologic domains of the Arctic Deposit.
LITHOLOGIC DOMAINS
Though a variety of detailed lithology variations are logged during data capture, NovaCopper currently models the following domains within the deposit area itself. These domains which are in part focused on the appropriate domains of acid-generating capacities and their spatial distribution around the fold axes include the following units: both the upper and lower fold limbs of the Button Schist (MRP upper, MRP lower), a series of felsic quartz mica schists of the hangingwall in the upper limb including the Felsite Top and Felsite Upper Limb units, chlorite and talc schists of footwall Felsite Fold unit, and the carbonaceous schists of the Grey Schist unit. SMS and MS are also modelled.
Earlier studies (Russell 1977, 1995; Schmidt 1983) concluded mineralization at the Arctic deposit was part of a normal stratigraphic sequence striking northeast and dipping gently southwest. Subsequent reinterpretation by Kennecott in 1998 and 1999 suggested the entire Ambler Sequence at Arctic could be overturned. Proffett (1999) reviewed the Arctic geology and suggested that a folded model with mineralization as part of an isoclinal anticline opening east and closing west could account for the mapped and logged geology. His interpretation called for an F2 fold superimposed on a north-trending F1 fabric.
NovaCopper Inc. | 7-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Lindberg (2004) supported a folded model similar to Proffett, though he felt the main fold at Arctic is northwest closing and southeast opening. Lindberg named this feature the Arctic Antiform, and interpreted this structure to be an F1 fold.
Lindberg believes the majority of folding within the mineralized horizons occurs in the central part of the deposit within a southwest plunging “cascade zone.” The increased thicknesses of mineralized intervals in this part of the property can in part be explained by the multiple folding of two main mineralized horizons as opposed to numerous individual mineralized beds as shown in the 1995 geologic model. The cascade zone appears to be confined to the upper sulphide limbs of the Arctic Antiform.
Continuity drilling on closer spacing in 2008 across the “cascade” zone confirms the continuity of the two mineralized horizons but does not support the complexity proposed by Lindberg. Dodd et al. (2004) suggested that some of the complexity might be related to minor thrusting. Results of 2006 mapping at Arctic supported the interpretation that an F2 fold event may fold the lower Button Schist back to the north under the deposit in this area (Otto 2006). Deep drilling in 2008 just to the north of the deposit to test the concept drilled the appropriate upright stratigraphy at depth. Though the target horizon was not reached due to the drill rig limitations the hole did encountered significant mineralization below the Button Schist immediately above the sulphide-bearing permissive stratigraphy. That hole (AR07-110) intersected roughly 35 m of anomalous mineralization including 0.45 m of 1.17% copper, 0.8% lead, 5.8% zinc, 49.7 g/t silver and 0.7 g/t gold.
Schmidt (1988) defined three main zones of hydrothermal alteration occurring at the Arctic Deposit:
| • | A main chloritic zone occurring within the footwall of the deposit consisting of phengite and magnesium-chlorite. |
| | |
| • | A mixed alteration zone occurring below and lateral to sulphide mineralization consisting of phengite and phlogopite along with talc, calcite, dolomite and quartz. |
| | |
| • | A pyritic zone overlying the sulphide mineralization. |
Field observations conducted by NovaCopper in 2004 and 2005 supported by logging and short wave infrared (SWIR) spectrometry only partially support Schmidt’s observations.
Talc and magnesium chlorite are the dominant alteration products associated with the sulphide-bearing horizons. Talc alteration grades downward and outward to mixed talc-magnesium chlorite with minor phlogopite, into zones of dominantly magnesium chlorite, then into mixed magnesium chlorite-phengite with outer phengite-albite zones of alteration. Thickness of alteration zones vary with stratigraphic interpretation, but tens of metres for the outer zones is likely, as seen in phengite-albite exposures on the east side of Arctic Ridge.
NovaCopper Inc. | 7-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Stratigraphically above the sulphide-bearing horizons significant muscovite as paragonite is developed and results in a marked shift in sodium/magnesium (Na/Mg) ratios across the sulphide bearing horizons.
Visual and quantitative determination of many of the alteration products is difficult at best due to their light colours and the well-developed micaceous habit of many of the alteration species. Logging in general has poorly captured the alteration products and the SWIR methodology though far more effective in capturing the presence or absence of various alteration minerals adds little in any quantitative assessment.
Of particular note are the barium species including barite, cymrite (a high-pressure Ba phyllosilicate), and Ba-bearing muscovite, phlogopite and biotite. These species associated with both alteration and mineralization has also been strongly remobilized during metamorphism (Schmandt 2009). Though little has been done to document their distribution, they do have a significant impact on bulk density measurements. Additional work will be needed to establish clarity on barium distribution and its effect on bulk density in combination with the various sulphide packages.
Additional discussion of the potential impacts of barite is discussed in the SG section (Sections 11.0 and 14.0) of this report.
Talc is of particular importance at the Arctic Deposit due to its potential negative impact on flotation characteristics during processing. Though talc is recognized as a significant component of the mineralized assemblage, its quantitative distribution is poorly understood at present though logging observations and SWIR measurements suggest that the core of the antiform opening to the east in the footwall of the mineralized horizon has increased quantities.
7.4 | ARCTIC DEPOSIT MINERALIZATION |
Mineralization occurs as stratiform SMS to MS beds within primarily graphitic chlorite schists and fine-grained quartz sandstones. The sulphide beds average 4 m in thickness but vary from less than 1 m up to as much as 18 m in thickness. The bulk of the mineralization is within five modelled zones lying along the upper and lower limbs of the Arctic isoclinal anticline. All of the zones are within an area of roughly 1 km2 with mineralization extending to a depth of approximately 250 m below the surface.
Mineralization characteristically varies from MS to SMS. Wireframes of the mineralized horizons have been modelled based on MS more than 50% sulphide minerals and SMS as 35 to 50% sulphide minerals.
Unlike more typical VMS deposits, mineralization is not characterized by steep metal zonation or massive pyritic zones. Mineralization is dominantly sheet-like zones of base metal sulphides with variable pyrite and only minor zonation usually on an extremely small scale. No stockworks or stringer zones in association with the mineralization have been observed. More importantly, the mineralization in general exhibits characteristics and textures common to replacement-style mineralization.
NovaCopper Inc. | 7-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Mineralization is predominately coarse-grained sulphides consisting mainly of chalcopyrite, sphalerite, galena, tetrahedrite, arsenopyrite, pyrite and pyrrhotite. Trace amounts of electrum and enargite are also present. Gangue minerals associated with the mineralized horizons include quartz, barite, white mica, black chlorite, talc, calcite, dolomite and cymrite. Figure 7.7 shows a typical massive sulphide interval. The 2 m interval grades 8.2% copper, 11.6% zinc, 1.6% lead, 103.2 g/t silver and 0.82 g/t gold.
Figure7.7 Typical Massive Sulphide Mineralization at the Arctic Deposit
Historic interpretation of the genesis of the Ambler Schist belt deposits have called for a syngenetic VMS origin with steep thermal gradients in and around seafloor hydrothermal vents resulting in metal deposition due to the rapid cooling of chloride bound base metals. A variety of VMS types have been well documented in the literature (Franklin et al. 2005) with the Ambler Schist belt deposits most similar to deposits associated with a bimodal mafic dominant volcanism related to incipient rifting.
The majority of field observations broadly support such a scenario at the Arctic Deposit and include: 1) the tectonic setting with Devonian volcanism in an evolving continental rift; 2) the geologic setting with bimodal volcanics including pillow basalts and limited felsic volcanic tuffs; 3) an alteration assemblage with well-defined magnesium-rich footwall alteration and sodium-rich hanging wall alteration; and 4) typical polymetallic base-metal mineralization with massive and semi-massive sulphides.
NovaCopper Inc. | 7-16 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Although the majority of field observations support a VMS genesis to the deposits of the Schist belt, a series of other observations and characteristics suggest a more direct genetic link with that of the carbonate-hosted Bornite Deposit in the Devonian Bornite Carbonate Sequence. Both deposit types have been dated at 375 to 387 Ma suggesting a clear temporal link.
Mineral deposition at the Bornite Deposit is attributed to the reduction of oxidized low temperature brines with carbonaceous and/or early framboidal pyrite. Like the Bornite Deposit, mineralization at the Arctic Deposit occurs at the first significant reductant boundary, the graphitic black schists surrounding the main ore-bearing stratigraphy immediately overlying oxidized mafic volcanics. Red beds also occur at greater depth in the stratigraphy within the Kogoluktuk Schist immediately below the Anirak Schist. Both oxidized mafic volcanics and red beds are considered prime sourcing for copper-rich chloride-rich fluids. Additionally, the replacement-like textures and the broad sheet-like zones of thin mineralization over kilometres in strike length suggest a depositional gradient more in line with a reductant control than the high temperature steep gradients related to more typical temperature dependent VMS and black smoker environments.
7.6 | DEPOSITS AND PROSPECTS |
In addition to the Arctic Deposit, numerous other VMS-like occurrences are present on the NovaCopper land package. The most notably of these occurrences are the Dead Creek (also known as Shungnak), Sunshine, Cliff, Horse, Cobre and the Snow prospects to the west of the Arctic Deposit and the Red, Nora, Tom-Tom and BT prospects to the east. Figure 7.9 shows the NovaCopper land package and the mineral prospects. Figure 7.9 also shows: 1) the Smucker deposit on the far west end of the Ambler Sequence which is currently controlled by Teck Inc.; 2) the Sun deposit at the eastern end of the Ambler Sequence and controlled by Andover Mining Corp., and 3) carbonate-hosted deposits and prospects in the Bornite Carbonate Sequence controlled by NovaCopper/NANA.
NovaCopper Inc. | 7-17 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 7.8 Prospects of the Ambler Mining District
NovaCopper Inc. | 7-18 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
The mineralization at the Arctic Deposit and at several other known occurrences within the Ambler Sequence stratigraphy of the Ambler District, consists of Devonian age, polymetallic (zinc-copper-lead-silver-gold) VMS-like occurrences. VMS deposits are formed by and associated with sub-marine volcanic-related hydrothermal events. These events are related to spreading centres such as fore arc, back arc or mid-ocean ridges. VMS deposits are often stratiform accumulations of sulphide minerals that precipitate from hydrothermal fluids on or below the seafloor. These deposits are found in association with volcanic, volcaniclastic and/or siliciclastic rocks. They are classified by their depositional environment and associated proportions of mafic and/or felsic igneous rocks to sedimentary rocks. There are five general classifications (Franklin et al. 2005) based on rock type and depositional environment:
| • | Mafic rock dominated often with ophiolite sequences, often called Cyprus type. |
| | |
| • | Bimodal-mafic type with up to 25% felsic volcanic rocks. |
| | |
| • | Mafic-siliciclastic type with approximately equal parts mafic and siliciclastic rocks, which can have minor felsic rocks and are often called Besshi type. |
| | |
| • | Felsic-siliciclastic type with abundant felsic rocks, less than 10% mafic rocks and shale rich. |
| | |
| • | Bimodal-felsic type where felsic rocks are more abundant than mafic rocks with minor sedimentary rocks, also referred to as Kuroko type. |
Prior to any subsequent deformation and/or metamorphism, these deposits are often bowl- or mound-shaped with stockworks and stringers of sulfide minerals found near vent zones. These types of deposit exhibit an idealized zoning pattern as follows:
• | Pyrite and chalcopyrite near vents. |
| |
• | A halo around the vents consisting of chalcopyrite, sphalerite and pyrite. |
| |
• | A more distal zone of sphalerite and galena and metals such as manganese. |
| |
• | Increasing manganese with oxides such as hematite and chert more distal to the vent. |
Alteration halos associated with VMS deposits often contain sericite, ankerite, chlorite, hematite and magnetite close to the VMS with weak sericite, carbonate, zeolite, prehnite and chert more distal. These alteration assemblages and relationships are dependent on degree of post deposition deformation and metamorphism. A modern analog of this type of deposit is found around fumaroles or black smokers in association with rift zones.
NovaCopper Inc. | 8-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In the Ambler District, VMS-like mineralization occurs in the Ambler Sequence schists over a strike length of approximately 110 km. These deposits are hosted in volcaniclastic, siliciclastic and calcareous metasedimentary rocks interlayered with mafic and felsic metavolcanic rocks. Sulphide mineralization occurs above the mafic metavolcanic rocks but below the Button schist, a distinctive district wide felsic unit characterized by large albite porphyroblasts after relic phenocrysts. The presence of the mafic and felsic metavolcanic units is used as evidence to suggest formation in a rift-related environment, possibly proximal to a continental margin.
A sulphide-smoker occurrence has been tentatively identified near Dead Creek northwest of the Arctic Deposit and suggests local hydrothermal venting during deposition. However, the lack of stockworks and stringer-type mineralization at the Arctic Deposit suggest that the deposit may not be a proximal vent type VMS. Although the deposit is stratiform in nature, it exhibits characteristics and textures common to replacement-style mineralization. At least some of the mineralization may have formed as a diagenetic replacement.
At Arctic, sulphides occur as semi-massive (30 to 50% sulphide) to massive (greater than 50% sulphide) layers, typically dominated by pyrite with substantial disseminated sphalerite and chalcopyrite and trace amounts of galena and tetrahedrite. The Arctic Deposit sulphide accumulation is thought to be stratigraphically correlative to those seen at the Dead Creek and Sunshine deposits up to 12 km to the west.
There is also an occurrence of epithermal discordant vein and fracture hosted base metal (lead-zinc-copper) mineralization with significant fluorite mineralization identified at the Red prospect in the Kogoluktuk Valley, east of the Arctic Deposit. Although not yet fully understood, the genesis of this occurrence is considered to be related to the regional system that formed the VMS deposits in the Ambler District.
Although the majority of field observations support a VMS genesis to the deposits of the Ambler Sequence schists, a series of other observations and characteristics suggest a possible direct genetic link with that of the Devonian carbonate-hosted Bornite Deposit to the south of the Ambler Sequence schists. Importantly, both deposit types have been dated at 375 to 387 Ma suggesting a clear temporal link.
Mineral deposition at the Bornite Deposit is attributed to the reduction of oxidized low temperature brines by carbonaceous and/or early framboidal pyrite. Like the Bornite Deposit, mineralization at the Arctic Deposit occurs at the first significant redox boundary in the stratigraphic section, which at the Arctic Deposit, consists along the graphitic black and grey schists surrounding the main mineralization bearing stratigraphy. This reduced stratigraphy overlies oxidized greenstones and at even greater depth oxidized red beds of the Kogoluktuk schist.
The replacement-like textures and the broad sheet-like zones of thin mineralization over kilometres in strike length suggest a depositional gradient more in line with a redox boundary control rather than the high temperature steep gradients typically associated with VMS and black smoker environments. Additionally, the district-wide regional metal zonation shows high copper at the Bornite Deposit, to higher zinc at the Arctic, Dead Creek and Sunshine deposits, to lower copper and higher zinc with higher gold-silver mineralization at both Smucker and Sun on the distal ends of the district. This is similar to the broad district zonation seen in basinal brine-derived systems such as the Kupferschiefer in Poland.
NovaCopper Inc. | 8-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Analogs to the basinal brine model would be more in line with the Kupferschiefer or the Democratic Republic of the Congo (DRC) deposits such as Tenke and Kamoa. Though the Kupferschiefer and the Congolese deposits lack any significant volcanic component, geochemically, they appear much more similar to the Arctic Deposit than typical VMS deposits. In the DRC, deposits also show a very similar district zonation with epigenetic dolomite systems such as Kipushi (an excellent analog to Bornite) temporally similar to the adjacent basinal systems.
There are important implications for exploration philosophy and methodology between a VMS origin and a basinal brine origin for the Ambler District deposits which could impact the overall potential of the district. Basinal systems represent some of the highest grade and most laterally extensive copper deposits in the world.
NovaCopper Inc. | 8-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The following section summarizes and highlights work completed by NovaCopper and its predecessor company NovaGold. NovaGold began exploration of the Arctic Deposit and surrounding lands of the Schist belt in 2004 after optioning the Property from Kennecott. Previous exploration on the Property during Kennecott’s tenure is summarized in Section 6.0.
Table 9.1 summarizes the exploration work conducted by NovaGold and NovaCopper during their tenure from 2004 to the present. Field exploration was largely conducted during the period between 2004 to 2007 with associated engineering and characterization studies between 2008 and the present. Drilling related to exploration is discussed in Section 10.0.
| Table 9.1 | Summary of NovaCopper/NovaGold Exploration Activities Targeting VMS-style Mineralization in the Ambler Sequence Stratigraphy and the ArcticDeposit |
Work Completed | Year | Details | Focus |
Geological Mapping |
- | 2004 | - | Arctic Deposit surface geology |
- | 2005 | - | Ambler Sequence west of the Arctic Deposit |
- | 2006 | - | COU, Dead Creek, Sunshine, Red |
Geophysical Surveys |
SWIR Spectrometry | 2004 | 2004 drill holes | Alteration characterization |
TDEM
| 2005 | 2 loops | Follow-up of Kennecott DIGHEM EM survey |
2006 | 13 loops | District targets |
2007 | 6 loops | Arctic extensions |
Downhole EM | 2007 | 4 drill holes | Arctic Deposit |
Geochemistry |
- | 2005 | - | Stream silts – core area prospects |
- | 2006 | - | Soils – core area prospects |
- | | - | Stream silts – core area prospects |
- | 2007 | - | Soils – Arctic Deposit area |
Survey |
Collar
| 2004 to 2011 | GPS | All 2004 to 2011 NovaCopper drill holes |
2004, 2008 | Resurveys | Historical Kennecott drill holes |
Photography/Topography | 2010 | - | Photography/topography |
table continues…
NovaCopper Inc. | 9-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Work Completed | Year | Details | Focus |
Technical Studies |
Geotechnical | 2010 | BGC | Preliminary geotechnical and hazards |
ML/ARD | 2011 | SRK | Preliminary ML and ARD |
Metallurgy | 2012 | SGS | Preliminary mineralogy and metallurgy |
Geotechnical and Hydrology | 2012 | BGC | Preliminary rock mechanics and hydrology |
Project Evaluation |
Resource Estimation | 2008 | SRK | Resource estimation |
PEA
| 2011 | SRK | PEA |
2012 | SRK | PEA update |
Note: SWIR = short wave infrared; ML = metal leaching; BGC = BGC Engineering Inc.; SRK = SRK Consulting
Survey and data capture during Kennecott’s tenure on the Property was in the UTM coordinates system NAD27 Zone 24. In 2010, NovaGold converted all historical geology and topographic data for the Arctic Deposit into UTM coordinates NAD83 for consistency. At that time NovaGold contracted WHPacific to re-establish project-wide survey control and benchmarks for the Arctic Deposit. Current mineral resource and geologic models, including the updated Tetra Tech mineral resource model discussed herein, use topography completed in 2010 by PhotoSat Inc. The resolution of the satellite imagery utilized was 0.5 m and a 1 m contour domain electromagnetic (DEM) was generated.
NovaGold has focused its exploration mapping efforts on an area covering approximately 18 km of strike length of the permissive Ambler Sequence rocks of the Schist belt stratigraphy. This area is centered on the Arctic Deposit and covers the thickest portion of the Ambler Sequence rocks. The area covers many of the most notable mineralized occurrences including the Red Prospect east of the Kogoluktuk River, the Arctic Deposit, and the nearby occurrences at the West Dead Creek and Dead Creek prospects, and the CS, Bud and Sunshine prospects west of the Shungnak River.
In 2004, mapping focused on the surface geology in and around the Arctic Deposit while exploration in 2005 extended the Ambler Sequence stratigraphy to the west. In 2006 with expansion of the exploration focus to encompass the immediate district and to support a major TDEM geophysical program, mapping was extended to include the area between the Sunshine prospect on the west and the Red prospect on the east. Figure 9.1 shows areas mapped by successive campaigns.
NovaCopper Inc. | 9-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 9.1 Mapping Campaigns in and around the Arctic Deposit
The following geologists made significant contributions during the following mapping campaigns:
| • | Paul Lindberg (2004, 2005, and 2006) |
| • | Doyle Albers (2004 and 2005) |
| • | Bruce Otto (2006) |
| • | Josh Ellis (2006) |
| • | Nathan Chutas (2006). |
Figure 9.2 shows a compilation of the mapping and the geology of the Arctic Deposit area highlighting stratigraphy within the Ambler Sequence.
NovaCopper Inc. | 9-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 9.2 Arctic Deposit Area Geology
During NovaGold and NovaCopper’s collective tenure in the Ambler District, significant soil and silt geochemical sampling was utilized to target many of the VMS prospects in the Ambler Sequence particularly in the core area around the Arctic Deposit. Between 2005 and 2007, NovaGold collected 2,272 soils and 278 silt samples. Much of the reconnaissance soil sampling has used gridding layouts of 200 m lines and 50 m sample intervals oriented perpendicular to stratigraphy.
Soil and silt samples were submitted directly to either ALS Chemex in Fairbanks or Alaska Assay Labs in Fairbanks for sample preparation. The samples were dried and sieved to 80 mesh and forwarded to ALS Chemex for analysis. The samples were analyzed using the ME-ICP61 method and a four acid near total digestion with 27 elements measured (silver, aluminum, arsenic, barium, beryllium, bismuth, calcium, cadmium, cobalt, chromium, iron, potassium, magnesium, manganese, molybdenum, sodium, nickel, phosphorus, lead, sulphur, antimony, strontium, titanium, vanadium, tungsten, and zinc).
Figure 9.3 and Figure 9.4 illustrate typical soil sampling campaigns and sample density and shows copper and zinc distribution, respectively in silt and soil samples in the Dead Creek prospect area. Section 10.0 discusses the geochemistry and sampling of the drill core.
NovaCopper Inc. | 9-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 9.3 Copper Distribution in Silt and Soil Samples in the Dead Creek Area
NovaCopper Inc. | 9-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 9.4 Zinc Distribution in Silt and Soil Samples in the Arctic Deposit Area
NovaCopper Inc. | 9-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
A number of different geophysical survey methods have been utilized at the Arctic Deposit during Kennecott’s tenure on the Property and are summarized in Section 6.0. During NovaCopper’s tenure, the geophysical methodology was largely focused on ground and downhole EM methods to follow-up on the 1998 DIGHEM airborne EM survey conducted by Kennecott.
From 2005 to 2007, NovaCopper conducted ongoing TDEM surveys and completed 21 different loops targeting the Arctic Deposit, extensions to the Arctic Deposit and a series of DIGHEM airborne anomalies in and around known prospects and permissive stratigraphy. Table 9.2 summarizes the TDEM loops and locations. Figure 9.5 illustrates typical TDEM loops and contoured resistivity at the Dead Creek prospect.
Frontier Geosciences of Vancouver, BC completed all of the geophysical programs using a Geonics PROTEM 37 transmitter, a TEM-57 receiver and either a single channel surface coil or a three component BH43-3D downhole probe.
Table 9.2 TDEM Loops and Locations
Area | 2005 | 2006 | 2007 |
Arctic | 1 | - | 6 |
COU | 1 | 3 | - |
Dead Creek | - | 4 | - |
Sunshine | - | 2 | - |
Red | - | 1 | - |
Tom Tom | - | 1 | - |
Kogo/Pipe | - | 2 | - |
Total | 2 | 13 | 6 |
In addition to the TDEM surveys, Frontier Geosciences surveyed four drill holes (AR05-89, AR07-110, AR07-111, and AR07-112). All of the holes produced off-hole anomalies, notably AR07-111, which showed evidence of a strong EM conductor north of the hole. Follow-up is warranted.
NovaCopper Inc. | 9-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 9.5 TDEM Loops and Contoured Resistivity – Dead Creek Prospect
NovaCopper Inc. | 9-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Bulk density determinations are discussed in Section 11.0.
9.6 | PETROLOGY, MINERALOGY AND RESEARCH STUDIES |
During 2004, NovaGold completed and extensive study of the 2004 drilling utilizing an Analytical Spectral Device (ASD) shortwave infrared spectrometer to better identify alteration species within the Arctic Deposit. The results are discussed in Section 7.0.
NovaCopper supported a series of academic studies of the Arctic Deposit. In 2009, Danielle Schmandt completed an undergrad thesis entitled “Mineralogy and Origin of Zn-rich Horizons within the Arctic Volcanogenic Massive Sulfide Deposit, Ambler District, Alaska” for Smith College. The Schmandt thesis focused on a structural and depositional reconstruction of the Arctic Deposit with the goal of locating the hydrothermal vents to aid in exploration vectoring.
Bonnie Broman, a NovaCopper geologist is currently completing a Master of Science thesis for the University of Alaska focusing on the nature and distribution of the silver-bearing mineral species within the Arctic Deposit.
9.7 | GEOTECHNICAL, HYDROGEOLOGICAL AND ACID BASE ACCOUNTING STUDIES |
NovaCopper undertook a series of geotechnical, hydrological and ABA studies which are summarized in Table 9.1. For a review of historical geotechnical, hydrological and ABA studies undertaken by Kennecott, refer to Section 6.0.
9.7.1 | GEOTECHNICAL STUDIES |
In November 2010, BGC completed a preliminary geotechnical study for NovaGold. The report focused on geotechnical aspects and hazards (avalanche mitigation) associated with the construction and maintenance of road infrastructure between the Bornite and the Arctic Deposits and accessing the Arctic Deposit by developing adit access.
9.7.2 | HYDROLOGICAL STUDIES |
In October 2011, BGC completed a rock mechanics and hydrogeological site investigation at the Arctic Deposit. The study was based on 1,200 m of geotechnical drilling in 5 core holes. Rock core from the drill holes was oriented using the ACTII system, and core samples were submitted for geomechanical laboratory testing. Drill holes were instrumented with grouted-in vibrating wire piezometers and dataloggers, and one drill hole was instrumented with a 10-bead thermistor string.
Data obtained from the drilling program was used to develop a geotechnical model, and the rock mass of the Arctic Project has been divided into six geotechnical units in the bedrock: WRZ (weathered rock), AZ (alteration zone), MZ (mineralized zone), FZ (fault zone), PHFW (proximal hangingwall/footwall), and DHFW (distal hangingwall/footwall). The RMR of the six units is: WRZ-42; AZ–47; MZ–62; FZ–32; PHFW-56 and DHFW-59, respectively.
NovaCopper Inc. | 9-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Structural data was reviewed and summarized in terms of joints, faults/shears, foliation, and major structure. Structural data collected during the 2008 and 2011 geotechnical programs indicate similar trends for the pervasive southwesterly dipping foliation.
A limited amount of temperature data was collected to investigate the potential for permafrost in the Arctic Project area. Although the data set is small, only one of the four drill holes with temperature data from 2011 indicates the potential for permafrost. This suggests that the Arctic Deposit could be permafrost-free, with the possible exception of the ridge top. Permafrost likely exists elsewhere in the Arctic Project area, particularly over the valley floor in areas covered with thick organics.
Results from the drilling program were used to develop a conceptual hydrogeological model. Measured hydraulic conductivity ranges from 3 x 10-9 to 6 x 10-7 m/s and is interpreted to be primarily related to fracture porosity. Several tests conducted in low rock quality designation (RQD) intervals and/or in intervals where faults failed due to water bypassing the top packer or insufficient pump capacity, indicating that higher inflow rates from some fault zones should be anticipated.
Piezometric levels recorded by vibrating wire piezometers installed at the site ranged from 181 m below ground near a topographic high to 13 m below ground at the lowest elevation of the drilling program. Nested vibrating wire installations indicate downward hydraulic gradients of 0.14 and 0.67, respectively. The available hydraulic head data indicated that groundwater flow is topographically driven by recharge in the uplands and discharge in the valley bottom.
9.7.3 | ACID-BASE ACCOUNTING STUDIES |
In July 2011, SRK completed a preliminary ML and ARD study of the Arctic Deposit for NovaCopper.
The ARD potential varies with rock type and sulphur content. Based on the current sampling, the rock types with the highest potential for ARD are mineralized material, gray schist and felsic schist with more than 0.5% total sulphur. Felsic schist with less than 0.5% total sulphur and talc/chlorite schist with less than 1% total sulphur are predominantly potentially non-acid generating (NAG) with a few samples having uncertain ARD potential. Figure 9.6 summarizes the PAG versus NAG results by rock type for the study.
NovaCopper Inc. | 9-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 9.6 PAG versus NAG by Rock Type at the Arctic Deposit
The study recommended humidity cells and initial leach tests to evaluate sulphide reactivity and ML. Mineralogical determinations were also recommended due to the complex sulphur and carbonate mineralogy.
9.7.4 | METALLURGICAL STUDIES |
In October 2012, SGS completed an in-depth metallurgical study of the Arctic Deposit in support of this report. An extensive discussion of the SGS metallurgical study and historic Kennecott metallurgical studies is presented in Section 13.0.
NovaCopper Inc. | 9-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Drilling at the Arctic Deposit has been ongoing since its initial discovery in 1965. Approximately 31,907 m of drilling in 135 drill holes have been completed at the deposit or on potential extensions in 23 campaigns spanning 45 years. All of the drill campaigns have been run under the auspices of either: 1) Kennecott and its subsidiaries, or 2) NovaGold, NovaCopper’s predecessor company.
Table 10.1 summarizes operators, campaigns, holes and metres drilled on the deposit. All drillholes listed in this table have been used in the estimation of the new resource disclosed in Section 14.0.
Table 10.1 Companies, Campaigns, Drill Holes and Metres Drilled at the Arctic Deposit
Year | Company | No. of Holes | Metres |
1966 | Bear Creek | 1 | 32 |
1967 | Bear Creek | 7 | 774 |
1968 | Bear Creek | 17 | 3,782 |
1969 | Bear Creek | 3 | 712 |
1970 | Bear Creek | 3 | 831 |
1971 | Bear Creek | 2 | 663 |
1973 | Bear Creek | 2 | 557 |
1974 | Bear Creek | 3 | 900 |
1975 | Bear Creek | 26 | 4,942 |
1976 | Bear Creek | 8 | 479 |
1977 | Bear Creek | 3 | 497 |
1979 | Bear Creek | 2 | 371 |
1981 | Bear Creek | 1 | 458 |
1982 | Bear Creek | 4 | 494 |
1983 | Bear Creek | 1 | 153 |
1984 | Bear Creek | 2 | 253 |
1986 | Bear Creek | 1 | 184 |
1998 | Kennecott | 6 | 1,523 |
2004 | NovaGold | 11 | 2,996 |
2005 | NovaGold | 9 | 3,393 |
2007 | NovaGold | 4 | 2,606 |
2008 | NovaGold | 14 | 3,306 |
2011 | NovaGold | 5 | 1,193 |
Total | - | 135 | 31,097 |
NovaCopper Inc. | 10-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Additional historical exploration drilling by operators other than Bear Creek/Kennecott exists in the VMS belt, however a portion is unavailable or has been lost over the years. Figure 10.1 shows drill locations of the all resource and exploration holes utilized in the Mineral Resource estimation of this report.
Figure 10.2 shows all holes utilized for metallurgical, geotechnical, hydrological and acid base accounting studies. Drill holes used for NovaCopper’s metallurgical study (SGS 2012) include AR08- 115, 117w, and 119. Drill holes utilized used geotechnical and hydrological studies (BGC 2011) include AR11-127, 128, 129, 130 and 131. Drill holes used in the ABA study (SRK 2011) include AR04-78, 83, 87, AR05-95, 97, AR08-116,120,123 and 126.
NovaCopper and its predecessor company NovaGold drilled 17,983 m in 59 different drill holes targeting the Arctic Deposit and several other prospects of the Ambler Schist belt. Table 10.2 summarizes all of the NovaCopper/NovaGold tenure drilling on the Property.
Table 10.2 Summary of NovaCopper/NovaGold Drilling
Year | Metres | No. of Drill Holes | Sequence | Purpose of Drilling |
2004 | 2,996 | 11 | AR04-78 to 88 | Deposit scoping and verification |
2005 | 3,030 | 9 | AR05-89 to 97 | Extensions to the Arctic Deposit |
2006*** | 3,100 | 12 | AR06-98 to 109 | Property-wide exploration drilling |
2007 | 2,606 | 4 | AR07-110 to 113 | Deep extensions of the Arctic Deposit |
2008* | 3,306 | 14 | AR08-114 to 126 | Grade continuity and metallurgy |
2011** | 1,193 | 5 | AR11-127 to 131 | Geotechnical studies |
2012*** | 1,752 | 4 | SC12-014 to 017 | Exploration drilling – Sunshine |
| Notes: | *A total of 12 of the 14 holes drilled in 2008 were utilized in the 2012 SRK resource update. Two holes were maintained in sealed frozen storage to provide additional metallurgical samples if required. |
| | **Geotechnical holes drilled in 2011 are not included in the current resource estimation contained herein. |
| | ***Drilling in 2006 and 2012 targeted exploration targets elsewhere in the VMS belt. |
NovaCopper Inc. | 10-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 10.1 Plan Map of Drill Holes Utilized in the Mineral Resource Estimation
NovaCopper Inc. | 10-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 10.2 Drill Holes Utilized for Metallurgical, Geotechnical, Hydrological and Acid-Base Accounting Studies
NovaCopper Inc. | 10-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Over the Arctic Project’s history, a relatively limited number of drill companies have been used by both Kennecott and NovaCopper/NovaGold at the Arctic Deposit. During Kennecott’s tenure on the Property, Sprague and Henwood, a Pennsylvania-based drilling company was the principal contractor. Tonto Drilling provided services to Kennecott during Kennecott’s short return to the district in the late 1990s. NovaCopper and NovaGold have utilized Boart Longyear as their only contractor. Table 10.3 summarizes drill companies and core sizes utilized.
Table 10.3 Drill Contractors, Drill Holes, Metreage and Core Sizes by Drill Campaign at the Arctic Deposit
Year | Company | No. of Drill Holes | Metres | Core Size | Drill Contractor |
1966 | Bear Creek | 1 | 32 | BX | Sprague and Henwood |
1967 | Bear Creek | 7 | 774 | BX | Sprague and Henwood |
1968 | Bear Creek | 17 | 3,782 | BX | Sprague and Henwood |
1969 | Bear Creek | 3 | 712 | BX | Sprague and Henwood |
1970 | Bear Creek | 3 | 831 | BX | Sprague and Henwood |
1971 | Bear Creek | 2 | 663 | BX? | Sprague and Henwood |
1973 | Bear Creek | 2 | 557 | BX? | Sprague and Henwood |
1974 | Bear Creek | 3 | 900 | NX and BX | Sprague and Henwood |
1975 | Bear Creek | 26 | 4,942 | NX and BX | Sprague and Henwood |
1976 | Bear Creek | 8 | 479 | NXWL and BXWL | Sprague and Henwood |
1977 | Bear Creek | 3 | 497 | NXWL and BXWL? | Sprague and Henwood |
1979 | Bear Creek | 2 | 371 | NXWL and BXWL? | Sprague and Henwood |
1981 | Bear Creek | 1 | 458 | NXWL and BXWL? | Sprague and Henwood |
1982 | Bear Creek | 4 | 494 | NXWL and BXWL? | Sprague and Henwood |
1983 | Bear Creek | 1 | 153 | NXWL and BXWL? | Sprague and Henwood |
1984 | Bear Creek | 2 | 253 | NXWL and BXWL? | Sprague and Henwood |
1986 | Bear Creek | 1 | 184 | NXWL and BXWL? | Sprague and Henwood |
1998 | Kennecott | 6 | 1,523 | HQ | Tonto |
2004 | NovaGold | 11 | 2,996 | NQ and HQ | Boart Longyear |
2005 | NovaGold | 9 | 3,393 | NQ and HQ | Boart Longyear |
2007 | NovaGold | 4 | 2,606 | NQ and HQ | Boart Longyear |
2008 | NovaGold | 14 | 3,306 | NQ and HQ | Boart Longyear |
2011 | NovaGold | 5 | 1,193 | NQ and HQ | Boart Longyear |
Sprague and Henwood utilized company manufactured drill rigs during their tenure on the Property. Many of their rigs remain at the Bornite Deposit and constitute a historical inventory of 1950s and 1960s exploration artifacts. The 2004 to 2012 NovaCopper/NovaGold drill programs used a single skid-mounted LF-70 core rig, drilling HQ or NQ core. The drill was transported by skid to the various drill pads using a D-8 bulldozer located on site. The D-8 was also used in road and site preparation. Fuel, supplies and personnel were transported by helicopter.
NovaCopper Inc. | 10-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
10.2 | DRILL CORE PROCEDURES |
| |
10.2.1 | KENNECOTT TENURE |
There is only partial knowledge of specific drill core handling procedures used by Kennecott during their tenure at the Arctic Deposit. All of the drill data collected during the Kennecott drilling programs (1965 to 1998) was logged on paper drill logs, copies of which are stored in the Kennecott office in Salt Lake City, Utah. Electronic scanned copies of the paper logs, in PDF format, are held by NovaCopper. Drill core was cut with half core submitted to various assay labs and the remainder stored in Kennecott core storage facility at the Bornite Deposit. In 1995, Kennecott entered the drill assay data, the geologic core logs, and the downhole collar survey data into an electronic format. In 2009, NovaGold geologists verified the geologic data from the original paper logs against the Kennecott electronic format and then merged the data into a Microsoft SQL database.
Sampling of drill core prior to 2004 by Kennecott and BCMC focused primarily on the mineralized zones. During the 1998 campaign, Kennecott did sample some broad zones of alteration and weak mineralization, but much of the unaltered and unmineralized rock remains unsampled. ALS Chemex was used for analyses conducted by Kennecott. Earlier BCMC sampling was even more restricted to mineralized zones of core. Intervals of visible sulphide mineralization were selected for sampling and analyses were conducted primarily by Union Assay Office Inc. of Salt Lake City, Utah. At least six other labs were used during that time period, but mostly as check labs or for special analytical work. Numerous intervals of weak to moderate mineralization remain unsampled in the historic drill core.
10.2.2 | NOVAGOLD/NOVACOPPER TENURE |
Throughout NovaCopper’s tenure on the Property, the following standardized core handling procedures have been implemented. Core is slung by helicopter to either the Dahl Creek (2004 to 2008) or Bornite (2011 to 2012) camps, where core-logging facilities have been established. Upon receiving a basket of core, geologists and geotechs first mark the location of each drilling block on the core box, and then convert footages on the blocks into metres. All further data capture is then based on metric measurements. Geotechs or geologists measure the intervals (or “from/to”) for each box of core using the drilling blocks and written measurements on the boxes.
Geotechs fill out metal tags with the hole ID, box number and “from/to”, and staple them to each core box. Geotechs then measure the core to calculate percent recovery and RQD. RQD is the sum of the total length of all pieces of core over 12 cm in a run. The total length of core in each run is measured and compared to the corresponding run length to determine percent recovery.
NovaCopper Inc. | 10-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Geologists then mark sample intervals to capture each lithology or other geologically appropriate intervals. Sample intervals of core are typically between 1 and 3 m in length but are not to exceed 3 m in length. Occasionally if warranted by the need for better resolution of geology or mineralization, smaller sample intervals have been employed. Geologists staple sample tags on the core boxes at the start of each sample interval, and mark the core itself with a wax pencil to designate sample intervals. Sample intervals used are well within the width of the average mineralized zones in the resource area. This sampling approach is considered sound and appropriate for this style of mineralization and alteration.
Core is then logged with lithology and visual alteration features captured on observed interval breaks. Mineralization data, including total sulfide (recorded as percent), sulfide type (recorded as a relative amount), gangue and vein mineralogy are collected for each sample interval with an average interval of approximately 2 m. Structural data is collected as point data. Geotechnical data (core recovery, RQD) were collected along drill run intervals.
After logging, the core is digitally photographed and cut in half using diamond core saws. Specific attention to core orientation is maintained during core sawing to ensure the best representative sampling. One-half of the core is returned to the core box for storage on site and the other half was bagged and labeled for sample processing and analysis. Select specific gravity measurements are also taken and are further discussed in Sections 11.0 and 14.0 of this report. The remaining half core is stored on site or at NovaCopper's Fairbanks warehouse.
10.3 | GEOTECHNICAL DRILL HOLE PROCEDURES |
Five HQ3 diameter diamond drill holes were completed during NovaGold’s 2011 geotechnical site investigation program at the Arctic Deposit. As shown in Figure 10.2, the drill holes were drilled using an LF 70 Boart-Longyear drill and were supervised by BGC on a 24-hour basis. Oriented core measurements were obtained using the ACT II tool. Constant rate injection and falling head packer tests were completed and vibrating wire piezometers (VWPs) equipped with single channel dataloggers (RST Instruments Ltd. DT2011 model) were installed. The ACT II core orientation system was used to orient discontinuities. Geotechnical logging was completed at the drill site by BGC. Point load testing was completed by NovaCopper once the core had been flown by helicopter back to the Bornite exploration camp. Core sampling for laboratory testing was completed by both BGC and NovaCopper.
All holes received either a single or a nest of two VWPs with single channel dataloggers. The VWPs were lowered to a pre-selected depth attached to a string of polyvinyl chloride pipes, which was then used as a tremie tube to backfill the hole with cement-bentonite grout. Data from each VWP was recorded by a single channel datalogger with a storage capacity and battery life exceeding one year. Knowledge of the barometric pressure was required for accurate conversion of the vibrating wire piezometer data. A Solinst barologger was installed at AR11-0128 for this purpose. The barologger was recorded continuously and downloaded at the same time as the VWP dataloggers. A thermistor was installed at AR11-0129 to monitor ground temperatures. A datalogger was not attached to this instrument, and therefore manual reading was required. Table 10.4 lists the geotechnical holes and outlines geotechnical instrumentation installed.
NovaCopper Inc. | 10-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 10.4 Geotechnical Holes and Instrumentation
Hole ID | BGC ID | Total Depth (m) | VWP 1 Depth (m) | VWP 2 Depth (m) | Thermistor Depth (m) | Barologger on Surface |
AR11-127 | BGC-E | 248.41 | 186.1 | - | - | No |
AR11-128 | BGC-A | 188.98 | 138.6 | - | - | Yes |
AR11-129 | BGC-D | 269.75 | 244.9 | 149.9 | 15.35 | No |
AR11-130 | BGC-F | 225.55 | 63 | - | - | No |
AR11-131 | BGC-B | 260.3 | 123.3 | 230.3 | - | No |
Point load testing was also completed on select intervals of core approximately every 5 m. Both axial and diametral tests were completed to investigate variation with respect to loading direction and foliation orientation.
10.4 | METALLURGICAL DRILL HOLE PROCEDURES |
A metallurgical test program was completed on four composite samples (Zone 1 & 2, Zone 3, Zone 5 and Zone 3 & 5) assembled from core in drill holes (AR08-115, 117w, and 119) representing material from the Arctic Deposit. The scope of the work included mineralogy, comminution and flotation test work. Figure 10.2 shows the plan location of metallurgical drill holes.
SGS Mineral Service’s Quantitative Evaluation of Minerals by Scanning Electronic Microscopy (QEMSCAM®) methodology utilizing high definition scanning electron microscopy was used on all composites to better determine mineralogy and mineral distributions.
Limited grindability tests were conducted on five selected samples. Standard Bond grindability test (BWi) for ball mill grinding and abrasion index test were conducted.
A conventional flowsheet which produced a bulk copper/lead and zinc concentrates was developed using the four composite samples through flotation testing. The flowsheet development primarily evaluated various primary grind size, depressant dosages and the effect of reagent dosage for copper/lead and zinc circuits. Regrinding of both the copper/lead and zinc concentrates was included in the flowsheet.
A detailed discussion and review of the metallurgical results can be found in Section 13.0.
NovaCopper Inc. | 10-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
10.5 | COLLAR SURVEYS |
| |
10.5.1 | KENNECOTT TENURE |
Kennecott provided NovaGold with collar coordinates for all historical holes in UTM coordinates using the NAD27 datum. NovaGold re-surveyed selected historical holes in 2004 and again in 2008. The re-surveys showed little variation compared to the historical surveys.
10.5.2 | NOVAGOLD/NOVACOPPER TENURE |
Collar location coordinates have been determined in all NovaGold/NovaCopper drill campaigns with a two Ashtech ProMark 2 GPS units using the Riley Vertical Angle Bench Mark (611120.442E, 7453467.486N) as the base station for all surveys. Data collection times varied from 30 minutes to 2 hours. Afternoon hours provided poor satellite constellations, so all surveying was completed during the morning hours. Raw GPS data was processed with Ashtech Solutions 2.60. All surveyed data was collected in the NAD27 datum.
A 2010 survey by a WHPacific Registered Land Surveyor observed differences between the 2010 and historical coordinates used for the Riley VABM, which were of the same magnitude (0.5 m east, 0.1 m north and 1.0 m down) as other Arctic drill collars that were re-surveyed for the third time. A correction was applied to all Arctic drill holes based upon the newly established coordinates for the Riley VABM, along with converting from NAD27 to NAD83 datums. All post 2010 surveys are completed in NAD83.
During a site visit by Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM on June 20 and 21, 2013, nine collars were located using a Garmin™ Etrex 20 GPS unit. The difference between reported and measured positions ranged between 3.4 and 7.8 m with an average discrepancy of 4.8 m. These differences are within the tolerances expected for GPS verification. The collar location surveys at the Arctic Deposit are considered to be sufficiently accurate for this study.
BCMC did not perform downhole surveys prior to 1971 (AR-32). In 1971, BCMC began to survey selected (mineralized) holes using a Sperry-Sun downhole survey camera usually at 30.5 m (100 ft) intervals. They were able to re-enter and survey a few of the older holes. BCMC and later Kennecott, applied a single azimuth (49°) and uniform dip deviation every 15.24 m (50 ft) that flattens with depth to all holes collared vertically that were not surveyed.
During NovaCopper’s tenure on the Property, downhole surveys from 2004 to 2011 were collected utilizing either a Reflex EZ-shot camera or a Ranger single-shot tool with individual survey readings collected at the drill rig on roughly 50 to 60 m intervals. The downhole survey data shows a pronounced deviation of the drill holes toward an orientation more normal to the foliation.
NovaCopper Inc. | 10-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Tetra Tech considers the downhole survey information at the Arctic Deposit to be of sufficient quality for this study.
Core recovery during NovaGold/NovaCopper’s tenure has been good to excellent, resulting in quality samples with little to no bias. There are no other known drilling and/or recovery factors that could materially impact accuracy of the samples during this period. Table 10.5 shows recoveries and RQD for each of the NovaGold/NovaCopper campaigns exclusive of the geotechnical drill holes in 2011. BGC (2012) reports a detailed and exhaustive discussion of the recoveries and RQDs of the 2011 drilling.
Table 10.5 Recovery and RQD 2004 to 2008 Arctic Drill Campaigns
Year | Metres | Recovery (%) | RQD (%) |
2004 | 2,996 | 98.0 | 73.4 |
2005 | 3,030 | 96.0 | 74.4 |
2007 | 2,606 | 95.7 | 73.1 |
2008 | 3,306 | 98.0 | 80.1 |
Incomplete Kennecott data exists with regards to overall core recovery but based on 917 intervals of 10 m or less in the historical database, the average recovery was 92%. Kennecott RQD measurements in the 1998 program averaged 87.0. There has been no systematic evaluation of recovery by rock type.
Tetra Tech considers the core recovery to be adequate to support the sampling and logging for this study.
The updated resource herein contains additional drilling not included in the previous 2012 SRK resource estimation (SRK 2012). Table 10.6 presents significant drill intercepts that have been returned since the previous Arctic Deposit mineral resource estimate (SRK 2012). Notably, several 2008 drill holes are now included in the resource estimation. These holes were maintained in frozen storage to provide additional metallurgical samples if needed. With the completion of the ongoing metallurgical studies by SGS in October 2012, these additional drill holes were assayed and added to the estimation database.
NovaCopper Inc. | 10-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 10.6 Drill Intercept Summary Table
Drill Hole ID | Easting (m) | Northing (m) | From (m) | To (m) | Length (m) | Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) |
AR11-0127 | 613435.4 | 7453049.1 | 87.50 | 90.19 | 2.69 | 5.43 | 0.51 | 3.70 | 1.14 | 56.5 |
AR11-0128 | 613047.5 | 7453300.4 | 87.78 | 93.76 | 5.98 | 2.75 | 1.00 | 5.19 | 0.85 | 49.3 |
AR11-0129
| 613145.8
| 7453094.4
| 150.85 | 163.07 | 12.22 | 3.85 | 0.99 | 8.10 | 0.69 | 72.7 |
185.63 | 195.97 | 10.34 | 1.79 | 0.84 | 3.92 | 0.29 | 37.7 |
199.37 | 207.78 | 8.41 | 3.44 | 1.08 | 7.22 | 0.78 | 77.7 |
AR11-0130 | 612955.3 | 7452904.1 | 167.00 | 179.05 | 12.05 | 2.88 | 0.97 | 4.58 | 0.63 | 48.3 |
AR11-0131 | 613191.8 | 7453315.3 | 166.80 | 168.50 | 1.70 | 4.60 | 5.92 | 23.14 | 1.42 | 205.9 |
10.9 | DRILLING AT OTHER PROSPECTS |
In addition to the drilling focused at the Arctic Deposit, significant exploration drilling has been carried out elsewhere on the property targeting numerous occurrences along the Ambler Schist belt. Much of this exploration is historical in nature and is summarized herein.
Drill results from many of the major prospects are tabulated in Table 10.7 and Table 10.8 and show the limited amount of drilling within the main prospect areas. Figure 10.3 shows the locations of known major prospects and drill collar locations for the Ambler District including NovaCopper-controlled Ambler and Bornite sequence targets.
Table 10.7 Drill, Metreage and Average Drill Depth for NovaCopper Ambler Sequence VMS Targets
Area | Drill Holes | Metres | Average Depth |
Arctic Deposit | 144 | 31,179 | 217 |
Dead Creek/West Dead Creek | 21 | 3,470 | 165 |
Sunshine/Bud | 36 | 7,111 | 198 |
Snow | 11 | 1,527 | 139 |
Horse/Cliff/DH | 22 | 2,277 | 104 |
Red/Nora/BT | 18 | 2,399 | 133 |
Total | 252 | 47,964 | 190 |
NovaCopper Inc. | 10-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 10.8 Significant Drill Intercepts – NovaCopper Ambler Sequence Prospects
Prospect | Drill Hole | Length (m) | Au (ppm) | Ag (ppm) | Cu (%) | Pb (%) | Zn (%) |
BT
| BT-4* | 2.56 | N/A | 33.4 | 1.86 | 0.91 | 2.23 |
BT-6* | 1.98 | N/A | 41.9 | 1.18 | 0.77 | 2.57 |
BT-7* | 3.2 | N/A | 52.3 | 2.92 | 1.56 | 4.39 |
Bud
| BUD-03 | 2.87 | 0.58 | 67.8 | 1.69 | 0.41 | 1.45 |
BUD-04 | 1.47 | 0.60 | 51.9 | 1.08 | 0.60 | 1.44 |
Cliff
| CLF-01* | 18.74 | 0.03 | 108.4 | 0.32 | 0.84 | 2.79 |
CLF-02 | 7.32 | 0.04 | 23.7 | 0.44 | 1.15 | 3.50 |
CLF-03 | 3.41 | 0.15 | 64.5 | 1.43 | 1.48 | 5.00 |
CLF-04* | 19.81 | N/A | N.A. | 0.39 | 0.67 | 2.46 |
CLF-05 | 10.97 | N/A | N.A. | 0.23 | 0.64 | 2.50 |
CLF-06 | 3.11 | N/A | 38.6 | 0.29 | 1.29 | 2.39 |
CLF-07 | 5.88 | N/A | 31.5 | 0.36 | 0.79 | 1.63 |
CLF-08* | 9.67 | N/A | 50.7 | 0.55 | 1.44 | 2.91 |
CLF-10 | 3.96 | N/A | 61.5 | 0.66 | 1.49 | 2.64 |
CLF-11 | 8.05 | N/A | 18.3 | 0.68 | 0.70 | 1.54 |
Dead Creek
| AR9803-01 | 2.71 | 0.10 | 22.4 | 0.52 | 0.23 | 1.27 |
DC-01 | 2.28 | N/A | 37.7 | 4.47 | N.A. | 1.77 |
DC-02* | 2.59 | N/A | 51.7 | 1.66 | N.A. | 2.01 |
DC-03* | 4.26 | 0.12 | 40.6 | 3.13 | 0.07 | 1.05 |
DC-04* | 3.22 | N/A | 67.5 | 1.39 | 0.27 | 1.13 |
DC-05 | 4.27 | 0.36 | 95.6 | 2.82 | 0.23 | 3.67 |
DC-06 | 4.57 | 0.06 | 15 | 0.96 | N.A | 0.31 |
DC-07* | 3.97 | N/A | 87.7 | 0.70 | N.A. | 2.71 |
DC-08 | 2.41 | N/A | 73.6 | 0.12 | N.A> | 3.68 |
DC-11 | 1.34 | 0.06 | 64.3 | 0.14 | 1.26 | 3.78 |
DH
| DH-02* | 20.12 | 0.20 | 35.0 | 0.54 | 1.90 | 4.71 |
DH-03 | 4.57 | 0.08 | 20.1 | 0.13 | 0.45 | 1.01 |
DH-05 | 9.14 | N/A | 29.3 | 0.33 | 1.3 | 2.01 |
Horse | HC-02 | 4.72 | N/A | 14.1 | 1.41 | 0.47 | 3.57 |
Nora
| NORA-01 | 1.68 | 0.14 | 17.5 | 1 | 0.58 | 2.94 |
NORA-07 | 3.44 | 0.04 | 6.9 | 2.81 | 0.01 | 0.01 |
NORA-08 | 2.9 | 0.07 | 0.9 | 1.21 | 0.01 | 0.01 |
Red | AR06-101 | 1.05 | 0.06 | 8.3 | 0.04 | 0.37 | 2.02 |
Snow
| SNO-21 | 4.73 | 3.26 | 430.2 | 0.32 | 3.56 | 6.26 |
SNO-23 | 1.22 | 0.07 | 10.3 | 0.02 | 1.70 | 0.97 |
SNO-24 | 2.44 | 1.04 | 210.9 | 0.63 | 3.50 | 4.69 |
table continues…
NovaCopper Inc. | 10-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Prospect | Drill Hole | Length (m) | Au (ppm) | Ag (ppm) | Cu (%) | Pb (%) | Zn (%) |
Sunshine
| SC-01* | 19.65 | 0.04 | 19.3 | 1.41 | 0.28 | 2.01 |
SC-02* | 18.04 | 0.07 | 19.8 | 1.14 | 0.38 | 3.06 |
SC-03* | 13.91 | 0.09 | 28.5 | 1.29 | 0.51 | 2.18 |
SC-04* | 14.17 | 0.87 | 33.9 | 0.94 | 0.77 | 3.17 |
SC-05* | 19.51 | 0.05 | 37.9 | 1.27 | 0.51 | 2.51 |
SC-06* | 10.67 | 0.06 | 35.1 | 2.16 | 0.68 | 3.46 |
SC-08* | 14.49 | 0.11 | 33.6 | 1.78 | 0.99 | 2.59 |
SC-11* | 6.03 | 0.04 | 8.4 | 0.83 | 0.28 | 1.33 |
West Dead Creek
| WDC-04 | 3.81 | N/A | 21.9 | 0.44 | 0.48 | 1.21 |
WDC-05* | 5.64 | 0.12 | 81.8 | 0.19 | 0.39 | 1.78 |
WDC-07 | 6.09 | N/A | 47.6 | 0.23 | 0.74 | 1.94 |
WDC-10 | 2.16 | 0.138 | 43.2 | 0.37 | 0.76 | 2.11 |
| Notes: | *Weighted sum or more than one interval. |
| | Composites based on 1.0% copper-equivalent cut-off grade, 1 m minimum composite, and up to 2 m. |
Figure 10.3 Known Collar Locations and Principal Target Areas – Ambler District
NovaCopper Inc. | 10-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NOVACOPPER TENURE
There have been only two drill campaigns (2006 and 2012) as shown in Table 10.2 by NovaCopper during their tenure targeting additional prospects beyond Arctic in the Ambler Schist belt. Exploration in 2006 targeted a series of geophysical anomalies in the central portion of the Ambler Schist belt near to Arctic. Twelve holes totalling 3,100 m were drilled. In 2012, NovaCopper drilled an additional 4 holes totalling 1,752 m to explore the down dip extension of the Sunshine deposit. Both programs are summarized in Table 10.9 and Figure 10.4 shows the Sunshine Prospect and drill hole locations.
Table 10.9 NovaCopper Exploration Drilling – Ambler Schist Belt
Hole ID | Area | Target | UTM East | UTM North | Azimuth (°) | Dip (°) | Depth (m) |
AR06-98 | COU | EM Anomaly | 609490 | 7454374 | 0 | -90 | 712.6 |
AR06-99 | 98-3 | EM Anomaly | 610111 | 7458248 | 0 | -90 | 420.0 |
AR06-100 | 98-3 | EM Anomaly | 609989 | 7458633 | 0 | -90 | 225.6 |
AR06-101 | Red | EM Anomaly | 618083 | 7451673 | 0 | -90 | 141.7 |
AR06-102 | Sunshine | West Extension | 601176 | 7457834 | 30 | -65 | 97.8 |
AR06-103 | Red | EM Anomaly | 618073 | 7451806 | 0 | -90 | 209.7 |
AR06-104 | Red | EM Anomaly | 617926 | 7451693 | 0 | -90 | 183.2 |
AR06-105 | Red | EM Anomaly | 618074 | 7451537 | 0 | -90 | 136.6 |
AR06-106 | Red | EM Anomaly | 618083 | 7451677 | 310 | -60 | 185.0 |
AR06-107 | Sunshine | West Extension | 601018 | 7458119 | 30 | -60 | 294.4 |
AR06-108 | Dead Creek | Downdip Extension | 607618 | 7458406 | 0 | -90 | 289.0 |
SC12-014 | Sunshine | Sunshine Extension | 601948 | 7457759 | 20 | -57 | 537.8 |
SC12-015 | Sunshine | Sunshine Extension | 601860 | 7457637 | 20 | -65 | 477.0 |
SC12-016 | Sunshine | Sunshine Extension | 601649 | 7457637 | 45 | -77 | 386.2 |
SC12-017 | Sunshine | Sunshine Extension | 602063 | 7457701 | 20 | -60 | 351.1 |
NovaCopper Inc. | 10-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 10.4 Sunshine Prospect and Drill Hole Locations
NovaCopper Inc. | 10-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
11.0 | SAMPLE PREPARATION,ANALYSES,ANDSECURITY |
11.1 | SAMPLE PREPARATION |
| |
11.1.1 | CORE DRILLING SAMPLING |
The data for the Arctic Deposit resource was generated over three primary drilling campaigns: 1966 to 1986 when BCMC, a subsidiary of Kennecott Copper Corporation was the primary operator, 1998 when Kennecott Minerals resumed work after a long hiatus, and 2004 to present with NovaGold Resources Inc. and now NovaCopper Inc. as the operators.
KENNECOTT AND BCMC
Sampling of drill core prior to 1998 by BCMC focused primarily on the mineralized zones; numerous intervals of weak to moderate mineralization were not sampled during this period. During the 1998 campaign, Kennecott did sample some broad zones of alteration and weak mineralization, but much of the unaltered and unmineralized drill core was left unsampled. Little documentation on historic sampling procedures is available.
NOVAGOLD AND NOVACOPPER TENURE
Between 2004 and 2006, NovaGold conducted a systematic drill core re-logging and re-sampling campaign of Kennecott and BCMC era drill holes AR-09 to AR-74. NovaGold either took 1 to 2 m samples every 10 m, or sampled entire lengths of previously unsampled core within a minimum of 1 m and a maximum or 3 m intervals. The objective of the sampling was to generate a full ICP geochemistry dataset for the Arctic Deposit and ensure continuous sampling throughout the deposit. Sample preparation procedures for NovaGold era work are described in the following subsection. Quality assurance/quality control (QA/QC) review of historic sampling is described in Section 11.4.
All drill core was transported by helicopter in secure core “baskets” to either the Dahl Creek camp or the Bornite camp for logging and sampling. Sample intervals were determined by the geologist during the geological logging process. Sample intervals were labelled with white paper tags and butter (aluminum) tags which were stapled to the core box. Each tag had a unique number which corresponded to that sample interval.
NovaCopper Inc. | 11-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Sample intervals were determined by the geological relationships observed in the core and limited to a 3 m maximum length and 1 m minimum length. An attempt was made to terminate sample intervals at lithological and mineralization boundaries. Sampling was generally continuous from the top to the bottom of the drill hole. When the hole was in unmineralized rock, the sample length was generally 3 m, whereas in mineralized units, the sample length was shortened to 1 to 2 m.
Geological and geotechnical parameters were recorded based on defined sample intervals and/or drill run intervals (defined by the placement of a wooden block at the end of a core run). Logged parameters were reviewed annually and slight modifications have been made between campaigns, but generally include rock type, mineral abundance, major structures, SG, point load testing, recovery and rock quality designation measurements. Drill logs were converted to a digital format and forwarded to the Database Manager, who imported them into the master database.
Core was photographed and then brought into the saw shack where it was split in half by the rock saw, divided into sample intervals, and bagged by the core cutters. Not all core was oriented; however, core that had been oriented was identified to samplers by a line drawn down the core stick. If core was not competent, it was split by using a spoon to transfer half of the core into the sample bag.
Once the core was sawed, half was sent to ALS Chemex Laboratories (ALS Chemex) in Vancouver for analysis and the other half was initially stored at the Dahl Creek camp but has been consolidated at the storage facility at the Bornite camp facilities or at NovaCopper’s warehouse in Fairbanks.
Shipment of core samples from the Dahl Creek camp occurred on a drill hole by drill hole basis. Rice bags, containing two to four poly-bagged core samples each, were marked and labelled with the ALS Chemex address, project and hole number, bag number, and sample numbers enclosed. Rice bags were secured with a pre-numbered plastic security tie and a twist wire tie and then assembled into sling loads for transport by chartered flights on a commercial airline to Fairbanks, where they were met by a contracted expeditor for deliver directly to the ALS Minerals preparation facility in Fairbanks. In addition to the core, control samples were inserted into the shipments at the approximate rate of one standard, one blank and one duplicate per 20 core samples:
| • | Standards: four standards were used at the Arctic Deposit. The core cutter inserted a sachet of the appropriate standard, as well as the sample tag, into the sample bag. |
| | |
| • | Blanks: were composed of an unmineralized landscape aggregate. The core cutter inserted about 150 g of blank, as well as the sample tag, into the sample bag. |
| | |
| • | Duplicates: the assay laboratory split the sample and ran both splits. The core cutter inserted a sample tag into an empty sample bag. |
NovaCopper Inc. | 11-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Samples were logged into a tracking system on arrival at ALS Chemex, and weighed. Samples were then crushed, dried, and a 250 g split pulverized to greater than 85% passing 75 μm.
Gold assays were determined using fire analysis followed by an atomic absorption spectroscopy (AAS) finish. The lower detection limit was 0.005 ppm gold; the upper limit was 1,000 ppm gold. An additional 34-element suite was assayed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) methodology, following nitric acid aqua regia digestion. The copper analyses were completed by atomic absorption (AA), following a triple acid digest.
11.1.2 | ACID-BASE ACCOUNTING SAMPLING |
In 1998, a broad assessment of ARD at the Arctic Deposit (Robertson 1998) was conducted with a focus on characterization for surface development. Criteria used for assessing and classifying ARD potential have since been modified.
In 2010, SRK collected 148 samples from drill core based on their position relative to the massive and semi-massive sulphide mineralization (SRK 2011). Samples were targeted within, immediately adjacent to, adjacent to, and between lenses of mineralization; the sampling program focused on characterization for underground development. Samples were shipped to SGS Canada Inc., Burnaby, BC, for sample preparation and analysis. Samples were analyzed for ABA and metals. ABA tests were conducted using the Sobek method with sulphur speciation and total inorganic carbon (TIC) analysis. Metal concentrations were determined using aqua regia digestion followed by ICP-MS analysis. In addition barium and fluorine were analyzed by x-ray fluorescence (XRF) following a lithium metaborate fusion.
11.1.3 | DENSITY DETERMINATIONS |
Representative SG determinations conducted before 1998 for the Arctic Project are lacking. Little information regarding sample size, sample distribution and SG analytical methodology are recorded for determinations during this period.
In 1998, Kennecott collected 38 core samples from that year’s drillcore, of which 22 were from mineralized zones and 16 from non-mineralized lithologies. Mineralized samples were defined as MS (more than 50% total sulphides), SMS (less than 50% total sulphides) or lithology samples (non-mineralized country rock containing up to 10% sulphides). SG determinations were conducted by ALS Chemex and Golder and Associates and were based on short (6 to 12 cm) whole core samples and determined based on the water displacement method.
In 1999, Kennecott collected 231 samples from pre-1998 drill core for SG analysis. The samples were from NQ- and BQ-sized core and averaged 7.27 cm in length. The samples were shipped to Anchorage but were not forwarded to a lab for further analysis.
NovaCopper Inc. | 11-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In 2004, NovaGold forwarded the 231 samples from the pre-1998 drill campaigns, stored in Kennecott’s Anchorage warehouse, as well as 33 new samples from the 2004 drill program, to Chemex Laboratories for SG analysis.
Additionally, in 2004 NovaGold collected 127 usable field SG measurements. Samples were collected from HQ-sized core and averaged 9.05 cm in length. An Ohaus Triple Beam Balance was utilized to determine a weight-in-air value for dried core, followed by a weight-in-water value. The wet-value was determined by suspending the sample by a wire into a water-filled bucket. The SG value was then calculated using the following formula:
Weight in air
[Weight in air – Weight in water]
In 2011, NovaGold geologists stopped collecting short interval “point data” (as described above) within the mineralized zone, and instead collected “full-assay-width” determinations from existing 2008 split core and all of the sampled 2011 whole core. The samples averaged 1.69 m in length. Samples were collected continuously within mineralized zones and within a 2 to 3 m buffer adjacent to mineralized zones. Two hundred sixty-six sample pulps were also submitted to ALS Chemex for SG determination by pycnometer analysis. In total, 459 valid SG determinations were collected, ranging from 2.64 to 4.99.
Security measures taken during historical Kennecott and BCMC programs are unknown to NovaGold or NovaCopper. NovaCopper is not aware of any reason to suspect that any of these samples have been tampered with. The 2004 to 2011 samples were either in the custody of NovaGold personnel or the assay laboratories at all times, and the chain of custody of the samples is well documented.
11.3 | ASSAYING AND ANALYTICAL PROCEDURES |
The laboratories used during the various exploration, infill, and step-out drill analytical programs completed on the Arctic Project are summarized in Table 11.1.
ALS Chemex has attained International Organization for Standardization (ISO) 9001:2000 registration. In addition, the ALS Chemex laboratory in Vancouver is accredited to ISO 17025 by Standards Council of Canada for a number of specific test procedures including fire assay of gold by AA, ICP and gravimetric finish, multi-element ICP and AA assays for silver, copper, lead and zinc.
NovaCopper Inc. | 11-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 11.1 Analytical Laboratories Used by Operators of the Arctic Project
Laboratory Name | Laboratory Location | Years Used | Accreditation | Comment |
Union Assay Office, Inc. | Salt Lake City, Utah | 1968 | Accreditations are not known. | Primary Assay Lab |
Rocky Mountain Geochemical Corp. | South Midvale, Utah
| 1973
| Accreditations are not known.
| Primary and Secondary Assays |
Resource Associates of Alaska, Inc. | College, Alaska
| 1973, 1974
| Accreditations are not known.
| Primary and Secondary Assays |
Georesearch Laboratories, Inc.
| Salt Lake City, Utah
| 1975, 1976
| Accreditations are not known.
| Primary and Secondary Assays |
Bondar-Clegg & Company Ltd.
| North Vancouver BC
| 1981, 1982
| Accreditations are not known.
| Primary and Secondary Assays |
Acme Analytical Laboratories Ltd. (AcmeLabs)
| Vancouver, BC
| 1998, 2012, 2013
| Accreditations are not known.
| 2012 and 2013 Secondary Check Sample Lab |
ALS Analytical Lab
| Fairbanks, Alaska
| 1998, 2004, 2005, 2006, 2012, 2013
| In 2004, ALS Chemex held ISO 9002 accreditations but changed to ISO 9001 accreditations in late 2004. ISO/International Electrotechnical Commission (IEC) 17025 accreditation was obtained in 2005. | 2012 and 2013 Primary Assay Lab
|
11.4 | QUALITY ASSURANCE/QUALITY CONTROL |
| |
11.4.1 | CORE DRILLING SAMPLING QA/QC |
Previous data verification campaigns were limited in scope and documentation and are described by SRK (2012).
During 2013, NovaCopper conducted a 26% audit of the NovaGold era assay database fields: sample interval, Au, Ag, Cu, Zn, and Pb. This audit is documented in a series of memos (Brown 2011; West 2013). NovaCopper staff did not identify and/or correct any transcription and/or coding errors in the database prior to resource estimation. NovaCopper also retained independent consultant Caroline Vallat, P.Geo. of GeoSpark Consulting Inc. (GeoSpark) to: 1) re-load 100% of the historical assay certificates, 2) conduct a QA/QC review of paired historical assays and NovaGold era re-assays; 3) monitor an independent check assay program for the 2004 to 2008 and 2011 drill campaigns; and 4) generate QA/QC reports for the 2004 to 2008 and 2011 drill campaigns. Below is a summary of the results and conclusions of the GeoSpark QA/QC review.
NovaCopper Inc. | 11-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NOVAGOLD QA/QC REVIEW ON HISTORICAL ANALYTICAL RESULTS
During 2004, NovaGold conducted a large rerun program and check sampling campaign on pre-NovaGold (pre-2004) drill core. The 2004 and 2005 ALS Chemex Laboratories primary sample results have been assigned as the primary assay results for the Arctic Project in the database, amounting to 1,287 of the total 3,186 primary samples related to pre-NovaGold drill holes.
During 2013, GeoSpark conducted a QA/QC review of available QA/QC data (20130422 – QAQC on Pre-NovaGold Arctic Assays); including sample pair data amounting to 422 data pairs which is 11% relative to the primary sample quantity. The sample pairs included original duplicates, original repeat assays, 2004 rerun assays on original sample pulps analyzed secondarily at ALS Chemex, and check samples from 2004 on original samples re-analyzed at ALS Chemex.
The review found that the available QA/QC data is related to drill holes that are spatially well distributed over the historic drill hole locations.
Figure 11.1 Spatial Availability of QA/QC Data
Review of Precision
A comparison of the original analytical results with the secondary results serves to infer the level of precision within the original results. Also, the 2004 rerun sample results and the check sample pair results from 2004 and 2005 were compared to the original assays to infer the level of repeatability or precision within the original results.
NovaCopper Inc. | 11-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
The result of the average relative difference (AD) review on sample pairs found satisfactory to good inferred precision levels for all of the sample pairs and elements except for the 2004 rerun sample lead results. For the lead 2004 rerun sample pairs there were 66.85% of the pairs less than the 1 AD limit, inferring poor precision in the original results. Overall, the lead values were found to pass the AD criteria for the original duplicates, original repeats, and check sample reviews. More insight was made regarding the lead precision upon review of the data pairs graphically within scatter plots and Thompson-Howarth Precision Versus Concentration (THPVC) plots. The 2004 rerun sample lead values were found to infer a poor-to-moderate level of precision and an indication that the original results might be of negative bias where the original results may have been reported on average 0.2% less than their true values for grades of 0.5% lead and higher. However, the original duplicate, original repeats, and check samples inferred that there was a moderate or satisfactory level of correlation within the lead values. Furthermore, the overall inference of precision in the lead values has been defined as moderate.
The detailed review of the gold pairs inferred an overall moderate level of precision within the original analytical results.
The silver, copper, and zinc analytical pair review found overall inferred strong precision in the original analytical results.
It is GeoSpark's opinion that the detailed review of analytical pair values reported for gold, silver, copper, lead and zinc has inferred an overall acceptable level of precision within the original sample analytical results for the pre-NovaGold Arctic Project.
Review of Accuracy
The rerun sample program of 2004 included analysis of 53 QA/QC materials comprising 20 standards and 33 blanks. These standards and blanks were reviewed in order to indirectly infer the accuracy within the original sample data.
The 2004 rerun samples on original pulps also included analysis of standards and blanks with the primary samples. These results have been reviewed using control charts for review of the inferred accuracy within the 2004 rerun sample results; in addition, the inferred rerun sample accuracy is related to the accuracy of the original results in that comparison of the original results to the 2004 reruns and has been shown to be acceptable overall.
The blank results were reviewed for gold, silver, copper, lead, and zinc and it has been inferred that there is good accuracy within the results and that there was no significant issue with sample contamination or instrument calibration during the analysis.
The standard results were reviewed for gold, silver, copper, lead, and zinc. The reported control limits were available for silver, copper, lead, and zinc. The gold control limits were calculated for the review.
NovaCopper Inc. | 11-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In addition upon initial review, the zinc control limits were also calculated from the available data to provide a more realistic range of control values for the results. The gold, silver, and copper results were inferred to be of strong accuracy. The lead and zinc results were inferred to be of moderate accuracy overall.
It was GeoSpark’s opinion that the review for accuracy has found an acceptable level of inferred accuracy within the gold, silver, copper, lead, and zinc results reported for the 2004 rerun samples and indirectly within the original results.
Review of Bias
There were 35 check samples on original samples re-assayed at ALS Chemex during 2004. These were reviewed for an indication of bias in the original results. Additionally, the 2004 rerun sample results have been reviewed for inference of bias in the original results.
Overall, the detailed review of the check sample pair gold concentrations has found minor positive bias in the 2004 pairs and minor positive bias in the 2005 pairs. The level of bias is inferred to be at very near zero with the original being reported approximately 0.005 greater than the 2004 results reported by ALS Chemex. The 2004 rerun samples compared to the originals has inferred negligible bias in the original gold results. It is GeoSpark's opinion that these levels of inferred bias are not significant to merit concern with the overall quality of gold values reported for the pre-NovaGold Arctic Project.
The detailed review of the check sample silver pairs has found minor negative bias implied by the 2004 check sample pairs. The 2004 rerun samples have shown a negligible amount of bias in the original results. It is GeoSpark’s opinion that overall the bias in original silver concentrations is inferred to be negligible to minor negative but not significant to merit concern of the overall quality of the silver results.
The copper check samples reported in 2004 were found to have a few anomalous results that were implying significant positive bias. However, a more detailed review found that the exclusion of the anomalous pairs resulted in a minor positive bias overall. The 2004 rerun sample copper results have shown that there is a possibility for positive bias in the original copper grades at concentrations greater than 5%. Overall, it is GeoSpark’s opinion that the bias inferred within the original copper results is not significant to merit concern with the original assay quality.
The 2004 check sample review inferred overall small negative bias in the original lead results. The 2004 rerun sample data also inferred that there was a small negative bias in the original results for grades over 0.5%. Overall, it is GeoSpark’s opinion that this detailed review has inferred that the levels of inferred bias within the lead concentrations are not significant enough to merit concern over the original result quality.
The original zinc results have been inferred to be of very minor positive bias when the 2004 check sample pairs (excluding three anomalous pairs) are reviewed. The 2004 rerun sample zinc values have been shown to be very comparable with the originals and a negligible amount of bias can be inferred in the original zinc concentrations. Furthermore, this detailed bias review has inferred that there is no significant bias in the original zinc results for the pre-NovaGold Arctic Project.
NovaCopper Inc. | 11-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Conclusion
The pre-NovaGold Arctic Project database analytical results have been verified and updated to provide a good level of confidence in the database records.
It is GeoSpark’s opinion that with consideration of the historic nature of the Arctic Project, a sufficient amount of QA/QC data and information has been reviewed to make a statement of the overall pre-NovaGold Arctic Project analytical result quality.
It is GeoSpark’s opinion that this detailed review has inferred that the pre-NovaGold Arctic Project analytical results are of overall acceptable quality.
QA/QC REVIEW ON NOVAGOLD (2004 TO 2013) ANALYTICAL RESULTS
During 2013, GeoSpark conducted a series of QA/QC reviews on NovaGold’s 2004 to 2013 analytical results. These QA/QC reviews serve to infer the precision of the NovaGold Arctic Project analytical results through a detailed analytical and statistical review of field duplicate samples; serve to infer the accuracy of the analytical results through a review of the standards and blanks inserted throughout the NovaGold programs; and serve to define any bias in the primary sample results through a review of secondary lab checks at AcmeLabs in Vancouver, BC.
The QA/QC reviews are documented in a series of memos (Vallat 2013c, 2013d, 2013e, 2013f, 2013g, 2013h). The reviews are summarized in the following subsections by year of campaign.
2004
The 2004 exploration program at the Arctic Project included drilling and sampling related to 11 drill holes AR04-0078 through AR04-0088, amounting to 989 primary samples assayed within 61 assay certificates reported by ALS Chemex in Fairbanks, Alaska.
The field duplicate pairs were reviewed analytically using an AD guideline to gauge the inferred level of precision within the results. This review found that the gold, silver, copper, lead and zinc grades were reported with less than 0.3 AD for at least 75% of the sample pairs. This shows strong repeatability or precision throughout.
In addition, scatter plots and THPVC plots were reviewed. The scatter plots showed moderate to strong precision within the gold grades, and strong precision within the silver, copper, lead, and zinc grades reported by ALS Chemex for the 2004 Arctic Project. The THPVC review found an inferred poor level of repeatability within the gold results, but further review showed that the precision percent was exaggerated due to the low gold grades reported for the samples. It is GeoSpark’s opinion that the THPVC review of the gold is an unreliable measure of the precision due to the low grades and that the earlier analytical tests and scatter plot results are more representative of the inferred precision for the gold results.
NovaCopper Inc. | 11-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The THPVC review found very strong repeatability of precision within the silver, copper, lead, and zinc concentrations reported by ALS Chemex for the 2004 Arctic Project.
Overall, the precision has been inferred to be strong for the gold, silver, copper, lead, and zinc concentrations reported by ALS Chemex for the 2004 Arctic Project.
Overall, the analytical results of analysis for gold reported by ALS Chemex for the 2004 Arctic Project have been inferred to be of strong accuracy. The silver, copper, lead, and zinc values have been inferred to have moderate or satisfactory accuracy. In addition, the review has shown no significant ongoing issues with sample contamination or instrument calibration.
The check sample review has found no bias inferred within the gold and silver grades reported for the 2004 Arctic Project. A small level of positive bias was inferred within the copper, lead, and zinc results reported on high-grade samples. The copper and lead bias may be attributable to specific details of the assay methodology. The zinc bias is more likely a reflection of a lack of repeatability at high grades. It is GeoSpark’s opinion that overall the levels of bias are not significant enough to merit concern with the sample result quality.
2005
The 2005 exploration program at the Arctic Project included drilling and sampling related to nine drill holes labelled AR05-0089 through AR05-0097, amounting to 1,228 primary samples assayed within 36 assay certificates reported by ALS Chemex in Fairbanks, Alaska.
The review of field duplicates, blanks and standards, and check samples has allowed for inference of a reasonable level of precision, good accuracy, and insignificant levels of bias within the primary sample results reported by ALS Chemex related to the 2005 Arctic Project.
This detailed QA/QC review on the analytical results reported for the 2005 Arctic Project has allowed for overall confidence in the analytical result quality.
The analytical results can be inferred to be of sufficient quality to represent the Arctic Project.
2006
The 2006 exploration program at the Arctic Project included drilling and sampling related to 12 drill holes labelled AR06-98 through AR06-109, amounting to 1,175 primary samples analyzed at ALS Chemex.
NovaCopper Inc. | 11-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The review of field duplicates, blanks and standards, and check samples for the 2006 Arctic Project has allowed for inference of a good level of precision, good accuracy, and insignificant levels of bias within the primary sample results reported by ALS Chemex related to drill holes AR06-98 through AR06-109.
The analytical results can be inferred to be of sufficient quality to represent the Arctic Project.
2007
The 2007 exploration program at the Arctic Project included drilling and sampling related to four drill holes labelled AR07-110 through AR07-113, amounting to 950 primary samples analyzed at ALS Minerals.
The review of field duplicates, blanks and standards, and check samples for the 2007 Arctic Project has allowed for inference of a good level of precision, good accuracy, and insignificant levels of bias within the primary sample results reported by ALS Minerals related to drill holes AR07-110 through AR07-113.
The analytical results can be inferred to be of sufficient quality to represent the Arctic Project.
2008
The 2008 exploration program at the Arctic Project included drilling and sampling related to 14 drill holes labelled AR08-0114 through AR08-0126 and also drill hole AR08-0117w, amounting to 1,406 primary samples assayed within 44 assay certificates reported by ALS Chemex in Fairbanks, Alaska.
The review of field duplicates, blanks and standards, and check samples for the 2008 Arctic Project has allowed for inference of a reasonable level of precision, good accuracy, and insignificant levels of bias within the primary sample results reported by ALS Minerals related to drill holes AR08-0114 through AR08-0126.
The analytical results can be inferred to be of sufficient quality to represent the Arctic Project.
2011 (Analyzed in 2013)
For the assay certificates FA13021131, FA13021132, FA13021133, FA13021134, and FA13021135 there were six field duplicate pairs, six blank instances, and three standard instances available for review of the QA/QC of the reported results.
The duplicates for gold, silver, copper, lead, and zinc were found to correlate well with the primary sample results and it can be inferred that the primary results are of good precision.
NovaCopper Inc. | 11-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Each of the blank instances of analysis was returned within the control limits for the material. Issues with sample contamination and instrumentation difficulties can be ruled out. In addition the accuracy can be inferred to be strong.
The standard instances of analysis were each retuned within the acceptable range for gold, silver, copper, lead, and zinc; it is inferred that there is strong accuracy within the reported primary sample assay results.
The detailed review of secondary lab check sample results reported by ALS Chemex or the 2011 drill holes assayed in 2013 and reported within the defined analytical certificates has shown that for the gold, silver, copper, lead, and zinc results there is no need to be concerned with the overall quality of the results and any indication of bias in the results is not significant to the result quality.
The assays within the certificates reviewed by GeoSpark can be inferred to be of good quality to represent the Arctic Project.
11.4.2 | ACID-BASE ACCOUNTING SAMPLING QA/QC |
SRK conducted a QA/QC review of the 2010 ABA dataset for the Arctic Project in March 2011. The memo entitled “Preliminary ML/ARD Analysis Ambler District Arctic Deposit, Alaska”, located in NovaCopper’s Document Management System (DMS), discusses the results of the ABA review and documents the 33 duplicate ABA analyses on the lab certificates.
11.4.3 | DENSITY DETERMINATIONS QA/QC |
A QA/QC review of the SG dataset for the Arctic Project was conducted by NovaCopper staff in March 2013. The memo entitled “Arctic_Specific Gravity Review_A.West_20130326”, located in NovaCopper’s DMS, discusses the results of the QA/QC review and is summarized in the following subsections.
LAB VERSUS FIELD DETERMINATIONS
SG lab determinations conducted during 2004 produced significantly lower average SG results for the mineralized zone than the 1998 and 2004 average field determinations. In the same test, lithology samples outside the mineralized zone produced comparable values. The difference between the averaged 1998 and 2004 lab results and those from field studies may be the result of selection bias, limited population size, and sample length. Paired lab and field determinations from the 2004 program show very low variation.
In 2010, to check the validity of the wet-dry measurements on the Arctic Deposit core with respect to possible permeability of the core samples, NovaGold measured 50 unwaxed samples representing a full range of SG values for a variety of lithologies and then submitted the samples to ALS Chemex for wet-dry SG determinations after being sealed in wax. The mean difference between the NovaGold unwaxed and the ALS Chemex waxed SG determinations was 0.01 g/cm3.
NovaCopper Inc. | 11-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In 2011, to check the accuracy of the wet-dry measurements, the SG for 266 pulps was determined by pycnometer by ALS Chemex (ALS code OA-GRA08b). Figure 11.2 shows that the two methods compare favourably, with the wet-dry measurements displaying a very slight low bias. Generally, wet-dry measurements are considered the more acceptable method for accurate SG determinations since they are performed on whole (or split) core that more closely resembles the in-situ rock mass.
Figure 11.2 Graph Showing Good Agreement between Wet-dry Measured Specific Gravity and Pycnometer Measured Specific Gravity
STOICHIOMETRIC METHOD
Full sample length determinations can be directly compared to the assay results for copper, zinc, lead, iron, and barium that are the major constituents of the sulphide and sulphate species for the Arctic Deposit. This allows NovaCopper to check the wet-dry measurements by estimating the SG for an ideal stoichiometric distribution of the elements into sulphide and sulphate species.
Stoichiometric SG values were estimated for 279 sample intervals from 2008 drillcore that had both measured SG values and total digestion XRF barium values. Figure 11.3 compares the estimated stoichiometric SGs to the measured SGs. Overall, there is a very good correlation between the two SG populations (R2 of 0.9671), though stoichiometric estimates are slightly lower with increasing SG. Using slightly different compositional values for the assorted sulphide and sulphate species, and assuming a 1:1 ratio of weight percent iron to weight percent copper in chalcopyrite (the molar value is 1:1), the stoichiometric equation yields SGs that have an even better correlation (R2=0.9726), due to partitioning more iron into less dense chalcopyrite which leaves less iron available for more dense pyrite, essentially correcting the bias for the lack of estimated iron-bearing silicates.
NovaCopper Inc. | 11-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 11.3 Measured versus Stoichiometric Specific Gravities
MULTIPLE REGRESSIONS METHOD
The positive comparisons/correlations of our measured SG values to the laboratory determined values and to the stoichiometric estimated values gives us high confidence in our wet-dry measurements. As a result, a multiple regression analysis can be performed using the assay data to get a best fit to the measured SGs. This may correct for the varying residencies of Fe and Ba (and also for the varying density within sphalerite due to the Zn:Fe ratio).
The best fit to the data was achieved by using the multiple regression tool in Microsoft Excel on Ba, Fe, Zn and Cu for the entire dataset (Figure 11.4). The estimate correlates very well (R2=0.9678) with observed data and has a sinusoidal pattern that fits the low and moderately high SG very well and has high bias for moderate SG values and a low bias for very high SG values. The resultant SG formula is as follows:
NovaCopper Inc. | 11-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
SG(Regression)= 2.567 + 0.0048*Cu (wt%) + 0.045*Fe (wt%) + 0.032*Ba (wt%) + 0.023%*Zn (wt%)
Figure 11.4 Scatter Plot Showing the Measured Specific Gravity versus Multiple (Copper, Iron, Zinc, Barium) Regression Estimate
DENSITY DETERMINATIONS PERFORMANCE
The SG of a field sample interval can be reproduced in the lab or estimated from assay values using either a stoichiometric method which assumes a fixed metal residency in certain sulphide and sulphates or by a multiple regression method that empirically fits measured data. Overall, what this QA/QC analysis suggests is that the measured SG values can be replicated by various methods, thus supporting the quality of the measured SG data.
Tetra Tech believes the database meets or exceeds industry standards of data quality and integrity. Tetra Tech believes the sample preparation, security and analytical procedures are adequate to support resource estimation and completion of a PEA.
NovaCopper Inc. | 11-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM, and one of the QPs of this NI 43-101 PEA, conducted a site visit from June 19 to 21, 2013 in support of this technical report. Verifications are based on data collected during the site visit, and a desktop study review.
12.1 | DRILL HOLE COLLAR VERIFICATION |
Nine drill hole collars (AR-03, AR-04, AR-10, AR-44, AR-47, AR-64, AR05-0094, AR05-0097 and AR-40) were located using a Garmin Etrex 20 GPS unit. The offset distances between the collar coordinates reflected in the drill hole database provided by NovaCopper and the measured positions range from 3.4 to 7.8 m with an average offset of 4.8 m. This range is within the tolerance to be expected from GPS measurements and Tetra Tech considers the collar positions to be adequately located to form the basis of resource estimation work.
12.2 | TOPOGRAPHY VERIFICATION |
Tetra Tech conducted two foot traverses over representative areas of the Arctic Deposit. Continuous GPS measurements were compiled during these traverses. The averages of these 724 spot height measurements within 10 m2 by 10 m2 areas were compared to the corresponding digital terrain model (DTM) survey points (Figure 12.1).
Figure 12.1 Distribution of the Differences Between GPS Elevations and the DTM
For the traverse data, 90% confidence limits are -0.73 m and +0.09 m. The vertical dimension of the estimation model block size is 5 m, which Tetra Tech considers to be acceptable for the block model estimation process.
NovaCopper Inc. | 12-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
12.3 | CORE LOGGING VERIFICATION |
Tetra Tech visited the NovaCopper core storage facility in Fairbanks and reviewed three drill holes for lithology, mineraization and the quality of storage.
Core boxes were found to be in good condition and intervals were easily retrieved for the following drill holes:
| • | AR05-0092 (129 to 147 m) |
| | |
| • | AR08-0117 (128 to 216 m) |
| | |
| • | AR08-0126 (144 to 211 m). |
Logged descriptions of massive and semi-massive sulphide mineralization and general sampling results corresponded to the appearance of the core for selected intervals. Tetra Tech considers that the logging style and data is acceptable for the geological modelling and resource estimation processes.
12.4 | DATABASE VERIFICATION |
Assay data in the database was verified against the corresponding ALS Chemex assay certificates (Table 12.1) by observation and independent spreadsheet comparison. Nine hundred and ten composite samples (analyzed for all five elements of interest: copper, zinc, lead, gold, and silver) were reviewed.
The NovaCopper drill database has been reviewed, and no significant concerns were noted. The results of previous data verification by an external QP (SRK 2012), completed for NovaCopper, were also reviewed. This previous data verification exercise included an extensive review of all NovaGold drilling as well as drilling completed by previous operators. Based on this review, Tetra Tech believes that the data verification completed on the NovaCopper dataset is sufficiently robust to support resource estimation.
Table 12.1 Assay Certificates Reviewed
| No. of |
Certificate | Samples |
FA04064633 | 20 |
FA04064636 | 20 |
FA04056401 | 20 |
FA04058933 | 20 |
FA04060274 | 20 |
FA04061994 | 20 |
FA04063778 | 20 |
FA04058925 | 20 |
EL08107514 | 40 |
table continues…
NovaCopper Inc. | 12-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Certificate | No. of Samples |
EL08107517 | 40 |
EL08107519 | 40 |
FA04061933 | 20 |
FA04061934 | 20 |
FA04061935 | 20 |
FA04061993 | 20 |
FA04062661 | 20 |
FA04064634 | 20 |
FA04064635 | 20 |
FA04064637 | 20 |
FA04064639 | 20 |
FA04073763 | 20 |
FA04073764 | 20 |
FA04073765 | 20 |
FA04073768 | 20 |
FA05011929 | 50 |
FA05073602 | 40 |
FA05074433 | 40 |
FA05075793 | 40 |
FA05075795 | 40 |
FA05077735 | 40 |
FA05079117 | 40 |
FA05079118 | 40 |
FA13021133 | 40 |
Standards, blanks, duplicates and check samples have been regularly submitted at a combined level of 20% of sampling submissions for all NovaGold/NovaCopper era campaigns. During the spring of 2013, GeoSpark conducted a thorough QA/QC review of pre-2004, 2004, 2005, 2006, 2007, 2008 and 2011 sampling campaigns which included review for accuracy, precision and bias (see Section 11.0). In addition to the QA/QC review, GeoSpark has been retained to provide ongoing database maintenance and QA/QC support.
Tetra Tech has reviewed the QA/QC dataset and reports and found the sample insertion rate and the timeliness of results analysis meets or exceeds industry best practices. The QA/QC results indicate that the assay results collected by NovaCopper, and previously by NovaGold, are reliable and suitable for the purpose of this study.
NovaCopper Inc. | 12-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
It is Tetra Tech’s opinion that the drill database for the Arctic Deposit is reliable and sufficient to support the purpose of this technical report and a current mineral resource estimate.
NovaCopper Inc. | 12-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
13.0 | MINERAL PROCESSING AND |
| METALLURGICAL TESTING |
13.1 | METALLURGICAL TEST WORK REVIEW |
| |
13.1.1 | INTRODUCTION |
The Arctic Deposit is a stratiform polymetallic VMS deposit comprised of semi-massive and massive sulphides deposited in a highly variable metasedimentary and metavolcanic stratigraphy. Hydrothermal alteration has resulted in the development of footwall magnesium-rich alteration characterized by abundant chlorite and talc and hanging wall sodium-rich alteration characterized by paragonite. In the mineralized zone, the principal economic minerals are chalcopyrite, sphalerite, galena, and minor tetrahedrite and bornite. Metallurgical studies have spanned over 30 years with metallurgical test work campaigns undertaken at the Kennecott Research Center (KRC), Lakefield Research Ltd. (Lakefield) and SGS. Tetra Tech reviewed the test programs conducted on the deposit, which are listed in Table 13.1; the test results are summarized in the following sections.
Table 13.1 Metallurgical Test Work Programs
Year | Laboratory | Mineralogy | Grindability | Flotation |
2012
| SGS
| √
| √
| Cu/Pb and Zn batch rougher and cleaner, Cu/Pb separation and locked cycle tests |
1999 | Lakefield | - | - | Cu/Pb and Zn batch rougher and cleaner, Cu/Pb separation |
1976
| KRC
| -
| √
| Cu, Pb, Zn and Ag batch rougher flotation (selective flotation procedure) |
1975 | KRC | √ | - | - |
1972 | KRC | - | - | Cu/Pb and Zn batch rougher and cleaner, Cu/Pb separation |
1970 | KRC | √ | - | - |
13.1.2 | MINERALOGICAL AND METALLURGICAL TEST WORK – SGS 2012 |
INTRODUCTION
In 2012, SGS conducted a test program on the samples produced from mineralization zones 1, 2, 3, and 5 of the Arctic Deposit (Section 14.0). To the extent known, the samples are representative of the styles and types of mineralization and the mineral deposit as a whole. Drill core samples were composited from each of the zones into four different samples for the SGS test work which included process mineralogical examination, grindability parameter determination, and flotation tests.
NovaCopper Inc. | 13-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
SGS used QEMSCAN™, a quantitative mineralogical technique utilizing scanning electron microscopy to determine mineral species, species liberation and mineral associations in order to develop grade limiting/recovery relationships for the composites.
Standard Bond grindability tests were also conducted on five selected samples to determine the BWi and Ai.
The flotation test work investigated the effect of various process conditions on copper, lead and zinc recovery using copper-lead bulk flotation and zinc flotation followed by copper and lead separation.
TEST SAMPLES
The 2012 test program used 90 individual drill core sample intervals totaling 1,100 kg from the Arctic Deposit. Individual samples were combined into four composites representing different zones and labelled as Composites Zone 1 & 2, Zone 3, Zone 5, and Zone 3 & 5. The sample materials used in the 2012 test program at SGS were specifically obtained for metallurgical test purposes. The drill cores were stored in a freezer to ensure sample degradation and oxidation of sulphide minerals did not occur.
The head grades of the composites are shown in Table 13.2.
Table 13.2 Head Grades – Composite Samples – 2012
Sample ID | Cu (%) | Pb (%) | Zn (%) | Fe (%) | S (%) | Au (g/t) | Ag (g/t) | MgO (%) |
Zone 1 & 2 A | 2.66 | 0.93 | 3.48 | 7.92 | 8.53 | 0.79 | 57.1 | 5.77 |
Zone 1 & 2 B | 2.60 | 0.96 | 3.38 | 7.54 | 8.18 | 0.78 | 58.0 | 5.79 |
Average | 2.63 | 0.95 | 3.43 | 7.73 | 8.36 | 0.79 | 57.6 | 5.78 |
Zone 3 A | 3.55 | 1.73 | 8.47 | 17.4 | 25.4 | 0.72 | 80.4 | 1.95 |
Zone 3 B | 3.57 | 1.72 | 8.69 | 17.6 | 26.1 | 0.62 | 80.3 | 1.93 |
Average | 3.56 | 1.73 | 8.58 | 17.5 | 25.8 | 0.67 | 80.4 | 1.94 |
Zone 3 & 5 A | 4.45 | 1.64 | 7.81 | 16.8 | 23.6 | 1.01 | 81.7 | 3.86 |
Zone 3 & 5 B | 4.37 | 1.55 | 7.7 | 16.5 | 23.4 | 0.93 | 82.2 | 4.05 |
Average | 4.41 | 1.60 | 7.76 | 16.7 | 23.5 | 0.97 | 82.0 | 3.96 |
Zone 5 A | 2.56 | 1.34 | 5.64 | 15.5 | 21.5 | 1.54 | 65.1 | 0.92 |
Zone 5 B | 2.55 | 1.32 | 5.72 | 16.1 | 20.9 | 0.77 | 60.8 | 0.88 |
Average | 2.56 | 1.33 | 5.68 | 15.8 | 21.2 | 1.16 | 63.0 | 0.90 |
MINERALOGICAL INVESTIGATION
SGS used QEMSCAN™ to complete a detailed mineralogical study on each composite to identify mineral liberations and associations, and to develop grade/recovery limiting relationships for the samples. Head assays indicate that all four composite samples contain a considerable amount of magnesium oxide, implying the potential for significant talc which could impact flotation.
NovaCopper Inc. | 13-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The mineral modal abundance for the composites is shown in Table 13.3.
Table 13.3 Mineral Modal Abundance for Composite Samples – 2012
| Mass (%) |
Mineral | Zone 1 & 2 | Zone 3 | Zone 3 & 5 | Zone 5 |
Chalcopyrite | 9.2 | 9.4 | 12.2 | 6.4 |
Bornite | 0.02 | 0.01 | 0.03 | 0.4 |
Tetrahedrite | 0.1 | 0.4 | 0.2 | 0.2 |
Antimony | 0.03 | 0.2 | 0.005 | 0.3 |
Galena | 1.3 | 2.1 | 2.1 | 2.1 |
Sphalerite | 7.2 | 14.6 | 14.3 | 11.3 |
Pyrite | 6.7 | 30.4 | 23.8 | 27.8 |
Pyrrhotite | 2.2 | 0.2 | 0.2 | 1.4 |
Arsenopyrite | 0.5 | 0.1 | 0.6 | 2.2 |
Other Sulphides | 0.1 | 0.1 | 0.2 | 0.1 |
Quartz | 30.2 | 8.6 | 9.0 | 16.6 |
Feldspar | 0.9 | 0.2 | 0.4 | 0.3 |
Magnesium-Chlorite | 11.9 | 3.4 | 2.8 | 1.1 |
Talc | 2.0 | 0.8 | 6.3 | 0.1 |
Micas | 14.2 | 1.9 | 7.0 | 9.4 |
Cymrite | 3.5 | 3.9 | 1.8 | 1.9 |
Clays | 0.6 | 0.05 | 0.2 | 0.1 |
IronOxides | 0.3 | 0.3 | 0.5 | 0.3 |
Carbonates | 3.4 | 1.3 | 4.2 | 2.0 |
Barite | 3.0 | 21.8 | 13.4 | 14.5 |
Fluorite | 1.7 | 0.1 | 0.4 | 1.2 |
Other | 1.1 | 0.3 | 0.4 | 0.4 |
Total | 100.0 | 100.0 | 100.0 | 100.0 |
The mineralogical study showed that the mineralogy of all four composites was similar. Each composite was composed mainly of pyrite, quartz, and carbonates. However, Composite Zone 1 & 2 contains approximately 30% quartz, compared to 8.6% for Composite Zone 3, and 16.6% for Composite Zone 5. The study also showed that Composite Zone 1 & 2 had the lowest pyrite content (6.7%) while Composites Zone 3 and Zone 5 contained approximately 30.4% and 27.8% pyrite, respectively.
In all four samples, the major floatable gangue minerals were talc and pyrite. Chalcopyrite was the main copper carrier. Combined bornite, tetrahedrite, and other sulphides (mainly enargite) accounted for less than 5% of the copper minerals in the Zone 1 & 2, Zone 3, and Zone 3 & 5 composites. In the Zone 5 sample, a slightly higher amount of bornite accounted for approximately 9% of the copper minerals. Galena was the main lead mineral (1.3% in the Zone 1 & 2 composite, and 2.1% in the other three composites) and sphalerite was the main zinc mineral (7.2% in Zone 1 & 2 composite and 11 to 14% in the other three composites).
NovaCopper Inc. | 13-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
All the composites contained a significant amount of talc, which may have the potential to consume reagents and dilute final concentrates. Therefore, SGS recommended that talc removal using flotation be employed prior to base metal flotation.
At a grind size of approximately 90% passing 150 µm (ranging from 94.5 to 89% passing 150 µm), chalcopyrite liberation ranged from approximately 80 to 87% (free and liberated combined) for all composites. The chalcopyrite is mostly free, with 7 to 10% associated with pyrite. For all composites, galena liberation ranged from 54 to 68% (free and liberated combined). Sphalerite liberation varied between 81 to 89%. Sphalerite is mostly free with about 7 to 10% associated with pyrite.
In general, SGS indicated that the liberation of galena and chalcopyrite was adequate, and acceptable copper and lead metallurgical performance was expected within the rougher circuit. Sphalerite was well liberated at the grind size.
COMMINUTION TEST WORK
SGS conducted a comminution study on five selected samples during the test program. The tests included the standard BWi test and Ai test.
Table 13.4 shows the results of the tests. The BWi values range from 6.5 to 11 kWh/t for the materials sampled. The data indicates that the samples are not resistant to ball mill grinding. The Ai ranged from 0.017 to 0.072 g, which indicates that the samples are not abrasive.
Table 13.4 Bond Ball Mill Grindability and Abrasion Index Test Results
Sample | Mesh of Grind Size | P80 (µm) | BWi (kWh/t) | Ai (g) |
MET – 1105341 | 150 | 88 | 6.7 | 0.032 |
MET – 1106043 | 150 | 88 | 6.5 | 0.019 |
MET – 1105868 | 150 | 85 | 7.4 | 0.030 |
MET – 1106033 | 150 | 87 | 9.3 | 0.072 |
MET – 1105853 | 150 | 89 | 11.1 | 0.017 |
FLOTATION TEST WORK
In 2012, SGS conducted bench-scale flotation test work to investigate the recovery of copper, lead, zinc, and associated precious metals using bulk copper-lead flotation and zinc flotation, followed by copper and lead separation. The four composite samples were tested for rougher flotation kinetics, cleaner efficiency, and copper and lead separation flotation efficiency. SGS also conducted locked cycle flotation tests on each composite.
The tests produced similar metallurgical performances among the samples tested, although the Zone 1 & 2 composite showed slightly inferior performance compared to the Zone 3 composite and Zone 5 composite.
NovaCopper Inc. | 13-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Open Circuit Flotation Test Work
The initial flotation tests evaluated rougher kinetics by investigating the effect of various reagent regimes on the flotation kinetics of copper, lead, and zinc minerals.
Cytec 3418A promoter and sodium isopropyl xanthate (SIPX) were used as collectors in the copper and lead flotation circuits. Methyl isobutyl carbinol (MIBC) was used as the frother to maintain a stable froth in the flotation stages. Hydrated lime was used as the pH regulator. Zinc cyanide, a mixture of zinc sulphate and sodium cyanide, or zinc sulphate alone, was used to suppress zinc minerals that might report to the copper and lead bulk concentrate.
Zinc was floated after the copper-lead bulk flotation using the traditional reagent regime, including SIPX as the collector and copper sulphate as the sphalerite activator at an elevated pH.
The feed material was ground to 80% passing 70 µm prior to talc pre-flotation. The talc flotation tailings were sent for copper-lead bulk flotation. The bulk copper-lead flotation tailings were conditioned with copper sulphate to activate sphalerite prior to zinc rougher flotation.
Regrinding was included in the flowsheet for both the copper-lead bulk concentrate and the zinc concentrate. The target regrind sizes were 80% passing 24 µm for the copper-lead bulk concentrate and 40 µm for the zinc concentrate.
The reground bulk copper-lead concentrate was cleaned to further reject sphalerite, pyrite, and other gangues. The reground zinc rougher concentrate was cleaned to produce the final zinc concentrate.
The testing indicated that a primary grind size of 80% passing 70 µm was adequate for the optimum copper-lead bulk rougher flotation and zinc rougher flotation. Copper grade and recovery to the bulk copper/lead rougher concentrate ranged from 16 to 21% and from 86 to 94%, respectively. The bulk concentrate also recovered between 89 and 94% lead, grading at 6.8 to 8.4%.
Gold and silver reported preferentially to the bulk copper-lead rougher concentrate. Gold recovery ranged from 54 to 80% to the bulk copper and lead cleaner concentrate, while silver recovery to the concentrate was in the range of between 68 and 84%.
Approximately 250 g/t of zinc cyanide was required to effectively depress the zinc minerals during flotation of the copper and lead minerals. Although zinc sulphate could be used as an alternative for zinc cyanide, approximately 1,500 g/t of zinc sulphate would be required, which is much higher than the zinc cyanide dosage. SGS recommended further tests to optimize the reagent regimes for zinc mineral suppression.
The cleaner flotation tests showed that regrinding was required to upgrade the bulk concentrates prior to separation of copper and lead minerals. The regrind size had not been optimized. It appeared that a regrind size of 80% passing approximately 30 µm would provide sufficient liberation for the bulk concentrate upgrading and copper-lead separation. Concentrate regrinding was incorporated into all locked cycle tests and open circuit cleaning tests.
NovaCopper Inc. | 13-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In the batch cleaner tests, lead was separated from the bulk copper and lead concentrate using a procedure to float lead minerals and suppress copper minerals. With one stage of lead rougher flotation and two stages of cleaner flotation, approximately 50 to 75% of the lead was recovered to the lead concentrate containing 41 to 60% lead. A high-grade copper concentrate was produced, ranging between 29 and 31% copper. The concentrate recovered between 75% and 91% of the copper from the bulk concentrates produced from the four composites.
Locked Cycle Test
SGS conducted six locked cycle tests to simulate bulk copper-lead flotation and zinc flotation in closed circuit. The bulk copper and lead concentrates produced were tested for copper and lead separation in an open circuit. The average locked cycle test results are shown in Table 13.5.
The copper recoveries to the bulk copper-lead concentrates produced from the locked cycle tests were as follows:
| • | 89 to 92% for the Zone 3 & 5 composite |
| • | 93% for the Zone 3 composite |
| • | 86 to 91% for the Zone 5 composite |
| • | 84% for the Zone 1 & 2 composite. |
The Zone 1 & 2 composite produced a low copper recovery. This could be due to insufficient sample for developing the optimized conditions for the test.
The copper grades of the copper concentrate produced ranged from 24 to 28%.
Approximately 88 to 94% of the lead was recovered to the bulk copper-lead concentrates, which contained 9 to 13% lead.
Three of the four composites demonstrated good zinc recovery in the locked cycle tests, excluding the Zone 1 & 2 composite sample.
The zinc recoveries to the final zinc concentrates produced from the locked cycle tests were as follows:
| • | 92% for the Zone 3 & 5 composite |
| • | 93% for the Zone 3 composite |
| • | 91% for the Zone 5 composite |
| • | 84% for the Zone 1 & 2 composite. |
NovaCopper Inc. | 13-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
On average, the zinc grades of the concentrates produced were higher than 55%, excluding the concentrate generated from Composite Zone 1 & 2, which contained only 44.5% zinc.
Gold and silver were predominantly recovered into the bulk copper-lead concentrates. Gold recoveries to this concentrate ranged from 65 to 80%, and silver recoveries ranged from 80 to 86%.
NovaCopper Inc. | 13-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 13.5 Locked Cycle Metallurgical Test Results
Test No. |
Product | Regrind Size 80% Passing | Weight % | Assays | Distribution (%) |
Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) | S (%) | Cu | Pb | Zn | Au | Ag | S |
Zone 3 & 5 LCT-1
| Talc Concentrate | Cu/Pb Rougher Concentrate: 52 µm; Zn Rougher Concentrate: 53 µm
| 7.3 | 0.66 | 0.35 | 1.25 | 0.09 | 15.7 | 2.56 | 0.4 | 0.5 | 0.5 | 0.3 | 0.5 | 0.3 |
Cu/Pb Cleaner 2 Concentrate | 14.8
| 27.6
| 10.2
| 1.96
| 4.05
| 405
| 30.0
| 89.4
| 91.7
| 4.6
| 70.3
| 84.0
| 20.0
|
Zn Cleaner 2 Concentrate | 10.3 | 3.11 | 0.62 | 57.2 | 0.67 | 60.9 | 32.8 | 7.0 | 3.9 | 92.8 | 8.1 | 8.8 | 15.3 |
Zn Cleaner 1 Scavenger Tailings | 3.9
| 1.24
| 0.42
| 1.46
| 2.85
| 41.7
| 28.9
| 1.1
| 1.0
| 0.9
| 13.1
| 2.3
| 5.1
|
Zn Rougher Tailings | 63.6 | 0.15 | 0.07 | 0.13 | 0.11 | 4.90 | 20.8 | 2.1 | 2.9 | 1.3 | 8.2 | 4.4 | 59.4 |
Feed | 100.0 | 4.42 | 1.59 | 6.17 | 0.83 | 69.1 | 21.5 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Zone 3 LCT-2
| Talc Concentrate | Cu/Pb Rougher Concentrate: 43 µm; Zn Rougher Concentrate: 41 µm
| 1.6 | 2.39 | 2.44 | 4.05 | 0.51 | 105.0 | 9.97 | 0.4 | 0.8 | 0.3 | 0.4 | 0.8 | 0.2 |
Cu/Pb Cleaner 2 Concentrate | 12.9
| 24.7
| 12.4
| 3.61
| 4.73
| 506
| 30.5
| 92.5
| 92.6
| 5.5
| 77.6
| 85.9
| 15.4
|
Zn Cleaner 2 Concentrate | 12.9 | 1.02 | 0.38 | 61.4 | 0.40 | 41.7 | 32.9 | 3.8 | 2.8 | 93.0 | 6.5 | 7.1 | 16.5 |
Zn Cleaner 1 Scavenger | 5.9 | 0.85 | 0.33 | 0.86 | 0.97 | 35.0 | 38.7 | 1.5 | 1.1 | 0.6 | 7.3 | 2.7 | 9.0 |
Tailings | | | | | | | | | | | | | |
Zn Rougher Tailings | 66.7 | 0.10 | 0.07 | 0.09 | 0.10 | 4.01 | 22.5 | 1.9 | 2.7 | 0.7 | 8.3 | 3.5 | 58.9 |
Feed | 100.0 | 3.42 | 1.71 | 8.43 | 0.78 | 75.3 | 25.4 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Zone 5 LCT-3
| Talc Concentrate | Cu/Pb Rougher Concentrate: 36 µm; Zn Rougher Concentrate: 35 µm
| 1.3 | 7.15 | 3.71 | 2.46 | 1.22 | 187.0 | 13.7 | 1.2 | 1.2 | 0.2 | 0.3 | 1.4 | 0.3 |
Cu/Pb Cleaner 2 Concentrate | 9.9
| 23.8
| 12.9
| 5.04
| 11.2
| 499
| 31.5
| 91.3
| 92.0
| 9.1
| 70.9
| 84.2
| 14.7
|
Zn Cleaner 2 Concentrate | 8.3 | 0.91 | 0.56 | 59.1 | 0.55 | 46.4 | 30.5 | 2.9 | 3.4 | 89.3 | 2.9 | 6.6 | 11.9 |
Zn Cleaner 1 Scavenger Tailings | 7.1
| 0.80
| 0.28
| 0.56
| 4.55
| 30.0
| 32.4
| 2.2
| 1.4
| 0.7
| 20.5
| 3.6
| 10.7
|
Zn Rougher Tailings | 73.4 | 0.09 | 0.04 | 0.05 | 0.11 | 3.38 | 18.1 | 2.4 | 2.0 | 0.7 | 5.3 | 4.2 | 62.4 |
Feed | 100.0 | 2.56 | 1.37 | 5.47 | 1.55 | 58.2 | 21.1 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
table continues…
NovaCopper Inc. | 13-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
Test No. |
Product | Regrind Size 80% Passing | Weight % | Assays | Distribution (%) |
Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) | S (%) | Cu | Pb | Zn | Au | Ag | S |
Zone 3 & 5 LCT 4
| Talc Concentrate | Cu/Pb Rougher Concentrate: 45 µm; Zn Rougher Concentrate: 23 µm
| 7.3 | 0.72 | 0.38 | 1.37 | 0.11 | 17.6 | 3.01 | 0.4 | 0.6 | 0.4 | 0.3 | 0.6 | 0.3 |
Cu/Pb Cleaner 2 Concentrate | 16.0
| 25.3
| 9.25
| 3.13
| 4.28
| 408
| 29.4
| 91.7
| 92.3
| 6.4
| 73.8
| 85.0
| 21.3
|
Zn Cleaner 2 Concentrate | 11.8 | 1.78 | 0.39 | 60.9 | 0.48 | 50.7 | 32.5 | 4.8 | 2.9 | 91.6 | 6.1 | 7.8 | 17.4 |
Zn Cleaner 1 Scavenger Tailings | 4.8
| 1.15
| 0.38
| 1.09
| 2.6
| 39.8
| 27.1
| 1.3
| 1.1
| 0.7
| 13.5
| 2.5
| 5.9
|
Zn Rougher Tailings | 60.2 | 0.14 | 0.08 | 0.13 | 0.1 | 5.19 | 20.2 | 1.9 | 3.2 | 1 | 6.3 | 4.1 | 55.1 |
Feed | 100.0 | 4.41 | 1.6 | 7.85 | 0.93 | 76.6 | 22.1 | 100 | 100 | 100 | 100 | 100 | 100 |
Zone 5 LCT-5
| Talc Concentrate | Cu/Pb Rougher Concentrate: 32 µm; Zn Rougher Concentrate: 24 µm
| 1.1 | 8.29 | 3.33 | 2.21 | 1.31 | 229 | 12.5 | 1.2 | 0.9 | 0.1 | 0.4 | 1.4 | 0.2 |
Cu/Pb Cleaner 2 Concentrate | 8.9 | 24.3 | 13.2 | 4.09 | 8.93 | 507 | 29.7 | 85.7 | 88.3 | 6.4 | 62.5 | 76.3 | 12.5 |
Zn Cleaner 2 Concentrate | 9.6 | 2.01 | 0.83 | 54.7 | 0.64 | 75.5 | 32.9 | 7.6 | 5.9 | 91.8 | 4.8 | 12.2 | 14.8 |
Zn Cleaner 1 Scavenger Tailings | 11.4
| 0.55
| 0.23
| 0.31
| 2.76
| 22.9
| 38.8
| 2.5
| 2.0
| 0.6
| 24.8
| 4.4
| 20.9
|
Zn Rougher Tailings | 69 | 0.11 | 0.06 | 0.09 | 0.14 | 4.97 | 15.8 | 3.1 | 3.0 | 1.0 | 7.5 | 5.8 | 51.5 |
Feed | 100.0 | 2.54 | 1.34 | 5.69 | 1.28 | 59.4 | 21.2 | 100 | 100 | 100 | 100 | 100 | 100 |
Zone 1 & 2 LCT-6
| Talc Concentrate | Cu/Pb Rougher Concentrate: 62 µm; Zn Rougher Concentrate: 55 µm
| 4.8 | 0.67 | 0.34 | 0.90 | 0.40 | 13.9 | 1.88 | 0.4 | 0.6 | 0.4 | 0.8 | 0.4 | 0.3 |
Cu/Pb Cleaner 2 Concentrate | 9.5
| 23.7
| 9.54
| 5.12
| 6.65
| 481
| 30.2
| 84.2
| 94.0
| 14.3
| 79.7
| 84.2
| 32.5
|
Zn Cleaner 2 Concentrate | 6.4 | 5.84 | 0.49 | 44.5 | 0.91 | 101.5 | 32.8 | 14.0 | 3.2 | 83.7 | 7.4 | 12.0 | 23.9 |
Zn Cleaner 1 Scavenger Tailings | 7.4
| 0.22
| 0.06
| 0.17
| 0.91
| 12.3
| 19.6
| 0.6
| 0.5
| 0.4
| 8.4
| 1.7
| 16.4
|
Zn Rougher Tailings | 71.8 | 0.03 | 0.02 | 0.06 | 0.04 | 1.34 | 3.30 | 0.8 | 1.7 | 1.2 | 3.7 | 1.8 | 26.8 |
Feed | 100.0 | 2.69 | 0.97 | 3.42 | 0.80 | 54.6 | 8.8 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Note: LCT = locked cycle test
NovaCopper Inc. | 13-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Copper/Lead Separation
SGS performed copper and lead separation tests on the bulk copper-lead concentrates produced from the locked cycle tests. Sodium cyanide was used to suppress copper minerals; 3418A was used as the lead collector and lime added to adjust the pulp pH to 10. Table 13.6 summarizes the separation test results.
The copper concentrates that were produced assayed at:
| • | 31% copper from Composite Zone 3 & 5 |
| • | 31% copper from Composite Zone 3 |
| • | 30% copper from Composite Zone 5 |
| • | 28 to 29% copper from Composite Zone 1 & 2. |
The lead second cleaner concentrates that were produced contained:
| • | 41% lead from Composite Zone 3 & 5 |
| • | 59% lead from Composite Zone 3 |
| • | 67% lead from Composite Zone 5 |
| • | 55% lead from Composite Zone 1 & 2. |
On average, the lead concentrates that were produced from the Zone 1 & 2, Zone 3, and Zone 5 composites contained approximately 2.2% copper while the copper content of the concentrate from the Zone 3 & 5 composite was higher, grading at 5%. There is a substantial reduction in lead recovery when the lead first cleaner concentrate was further upgraded.
Gold was predominantly recovered into the copper concentrate. However, silver recovered to the lead second cleaner concentrates varied from sample to sample. It appears that the silver in the bulk copper-lead concentrate that was produced from Composite Zone 3 is more likely to report to the lead concentrate. However, the copper concentrate recovered more silver than lead concentrate for the Zone 1 & 2 and Zone 5 composites.
NovaCopper Inc. | 13-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 13.6 Copper and Lead Separation Test Results
Test |
Product | Weight % | Assays | Distribution (%)
|
Cu (%) | Pb (%) | Zn (%) | Ag (g/t) | Au (g/t) | S (%) |
Cu | Pb | Zn | Ag | Au | S |
Zone 3 & 5 Cu/Pb Separation Feed from LCT-4 (Cycle 2)
| Pb 2ndCleaner Concentrate | 8.2 | 5.99 | 41.0 | 2.02 | 2,330 | 18.9 | 13.1 | 1.9 | 37.0 | 6.0 | 44.7 | 35.9 | 3.4 |
Pb 1stCleaner Concentrate | 22 | 6.87 | 37.5 | 4.34 | 1,665 | 13.6 | 20.6 | 5.9 | 90.8 | 34.8 | 85.7 | 69.5 | 14.3 |
Pb Rougher Concentrate | 37.7 | 16.4 | 23.0 | 3.43 | 1,033 | 9.17 | 26.2 | 24.1 | 95.5 | 47.4 | 91.3 | 80.3 | 31.4 |
Pb Rougher Tailings (Cu Concentrate) | 62.3 | 31.3 | 0.65 | 2.31 | 59 | 1.36 | 34.7 | 75.9 | 4.5 | 52.6 | 8.7 | 19.7 | 68.6 |
Cu/Pb 2ndCleaner Concentrate (Head) | - | 25.7 | 9.07 | 2.73 | 4.27 | 4.31 | 31.5 | - | - | - | - | - | - |
Zone 3 & 5 Cu/Pb Separation Feed from LCT-4 (Cycle 3)
| Pb 2ndCleaner Concentrate | 10.8 | 4.09 | 41.2 | 2.75 | 1,970 | 1.87 | 12.3 | 1.7 | 49.7 | 8.9 | 53.4 | 4.9 | 4.2 |
Pb 1stCleaner Concentrate | 20.3 | 5.47 | 38.1 | 4.76 | 1,618 | 1.38 | 19.3 | 4.3 | 86.6 | 28.9 | 82.6 | 6.8 | 12.5 |
Pb Rougher Concentrate | 28.9 | 11.6 | 28.4 | 4.16 | 1,206 | 1.19 | 23.4 | 13 | 92.0 | 36.0 | 87.6 | 8.4 | 21.6 |
Pb Rougher Tailings (Cu Concentrate) | 71.1 | 31.6 | 1.0 | 3.01 | 69 | 5.29 | 34.7 | 87 | 8.0 | 64.0 | 12.4 | 91.6 | 78.4 |
Cu/Pb 2ndCleaner Concentrate(Head) | - | 25.8 | 8.93 | 3.34 | 398 | 4.11 | 31.4 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Zone 3 Cu/Pb Separation from Open Circuit Test (Test F25)
| Pb 2ndCleaner Concentrate | 2.1 | 2.22 | 58.8 | 5.58 | 1,622 | 0.3 | 20.8 | 1.4 | 74.9 | 1.4 | 44.2 | 1.0 | 1.8 |
Pb 1stCleaner Concentrate | 2.9 | 4.51 | 48.3 | 6.94 | 1,369 | 0.5 | 24.1 | 3.8 | 83.8 | 2.4 | 50.9 | 2.0 | 2.8 |
Pb Rougher Concentrate | 4.3 | 12.4 | 33.6 | 6.54 | 1,026 | 1.05 | 26.9 | 15.3 | 86.0 | 3.3 | 56.3 | 6.6 | 4.6 |
Pb Rougher Tailings (Cu Concentrate) | 8.3 | 31.5 | 0.29 | 4.33 | 231 | 5.24 | 33.3 | 75.1 | 1.4 | 4.2 | 24.5 | 63.9 | 11.0 |
Cu/Pb 2ndCleaner Concentrate (Head) | 12.6 | 25.0 | 11.6 | 5.08 | 502 | 3.81 | 31.1 | 90.4 | 87.4 | 7.5 | 80.8 | 70.5 | 15.5 |
Zone 5 Cu/Pb Separation Feed from LCT-5 (Cycle 2)
| Pb 2ndCleaner Concentrate | 6.6 | 2.42 | 69.0 | 2.68 | 1,230 | 1.27 | 15.8 | 0.6 | 41.1 | 3 | 17.2 | 1.8 | 3.3 |
Pb 1stCleaner Concentrate | 15.2 | 3.78 | 57.6 | 4.18 | 993 | 1.92 | 20.5 | 2.3 | 78.8 | 11.5 | 31.9 | 6.1 | 9.8 |
Pb Rougher Concentrate | 25.5 | 10.3 | 40.3 | 4.82 | 778 | 6.31 | 25.1 | 10.5 | 92.4 | 22.1 | 41.9 | 33.6 | 20.1 |
Pb Rougher Tailings (Cu Concentrate) | 74.5 | 30.0 | 1.13 | 5.79 | 369 | 4.26 | 34.1 | 89.5 | 7.58 | 77.9 | 58.1 | 66.4 | 79.9 |
Cu/Pb 2ndCleaner Concentrate (Head) | - | 25.0 | 11.1 | 5.54 | 473 | 4.78 | 31.8 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Zone 5 Cu/Pb Separation Feed from LCT 5 (Cycle 3)
| Pb 2ndCleaner Concentrate | 5.2 | 2.09 | 65.4 | 3.72 | 1,180 | 1.98 | 17.8 | 0.4 | 28.0 | 4.7 | 12.5 | 1.6 | 2.9 |
Pb 1stCleaner Concentrate | 17.5 | 3.54 | 54 | 4.09 | 900 | 1.24 | 21.9 | 2.5 | 77.9 | 17.5 | 32.2 | 3.4 | 12.1 |
Pb Rougher Concentrate | 27.3 | 8.5 | 40 | 4.27 | 760 | 7.83 | 25.9 | 9.5 | 90 | 28.5 | 42.4 | 33 | 22.2 |
Pb Rougher Tailings (Cu Concentrate) | 72.7 | 30.4 | 1.67 | 4.01 | 388 | 5.97 | 34 | 90.5 | 10 | 71.5 | 57.6 | 67 | 77.8 |
Cu/Pb 2ndCleaner Concentrate (Head) | - | 24.4 | 12.1 | 4.08 | 489 | 6.48 | 31.8 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
table continues…
NovaCopper Inc. | 13-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
| |
Test |
Product | Weight % | Assays | Distribution (%) |
Cu (%) | Pb (%) | Zn (%) | Ag (g/t) | Au (g/t) | S (%) | Cu | Pb | Zn | Ag | Au | S |
Zone 1 & 2 Cu/Pb Separation Feed from LCT-6 (Cycle 2)
| Pb 2ndCleaner Concentrate | 7.59 | 2.4 | 57.3 | 5.59 | 0.54 | 1,313 | 15.1 | 0.76 | 47.1 | 8.1 | 0.7 | 20.1 | 3.78 |
Pb 1stCleaner Concentrate | 16.4 | 4.38 | 45.3 | 7.96 | 0.77 | 1,038 | 19.9 | 2.98 | 80.5 | 24.9 | 2.2 | 34.4 | 10.8 |
Pb Rougher Concentrate | 23.6 | 9.6 | 34.3 | 7.19 | 1.13 | 849 | 22.9 | 9.4 | 87.7 | 32.3 | 4.6 | 40.4 | 17.8 |
Pb Rougher Tailings (Cu Concentrate) | 76.4 | 28.6 | 1.49 | 4.64 | 7.14 | 386 | 32.6 | 90.6 | 12.34 | 67.7 | 95.4 | 59.6 | 82.2 |
Cu/Pb 2ndCleaner Concentrate (Head) | - | 24.1 | 9.23 | 5.24 | 5.72 | 495 | 30.3 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
Zone 1 & 2 Cu/Pb Separation Feed from LCT-6 (Cycle 3)
| Pb 2ndCleaner Concentrate | 4.74 | 1.8 | 53.2 | 3.86 | 0.77 | 1,373 | 11.8 | 0.36 | 28.4 | 4.07 | 0.7 | 14.1 | 1.87 |
Pb 1stCleaner Concentrate | 13.2 | 3.31 | 48.3 | 6.37 | 0.74 | 1,155 | 16.6 | 1.84 | 72.2 | 18.8 | 1.8 | 33.2 | 7.3 |
Pb Rougher Concentrate | 22 | 8.7 | 34.6 | 6.24 | 1.13 | 874 | 20.9 | 7.99 | 85.7 | 30.5 | 4.5 | 41.7 | 15.3 |
Pb Rougher Tailings (Cu Concentrate) | 78 | 28.1 | 1.62 | 4.01 | 6.72 | 344 | 32.4 | 92 | 14.3 | 69.5 | 95.5 | 58.3 | 84.7 |
Cu/Pb 2ndCleaner Concentrate (Head) | - | 23.8 | 8.9 | 4.5 | 5.49 | 461 | 29.9 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
NovaCopper Inc. | 13-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Concentrate Multi-element Assay
ICP assays were conducted on the copper and lead concentrates produced from the open circuit tests and the zinc concentrate from the locked cycle tests. The main impurity elements are shown in Table 13.7 to Table 13.9.
The results indicated that on average, the arsenic, antimony, and lead content of the copper concentrates may be higher than the penalty thresholds outlined by most copper concentrate smelters. The mercury content of the concentrate should be lower than the penalty threshold excluding the concentrate produced from Composite Zone 5, which may exceed the threshold.
Similar to the copper concentrates, the lead concentrate may receive penalties for the high arsenic and antimony concentrations.
Silicon dioxide and fluoride assays should be conducted on the concentrates to determine whether or not they are higher than the penalty thresholds.
Table 13.7 Multi-element Assay Results – Copper Concentrate
Composite | Zone 3 & 5 | Zone 5 | Zone 1 & 2 |
Mercury (ppm) | 1.9 | 9.8 | 4.2 |
Arsenic (ppm) | 1,114 | 4,040 | 82 |
Antimony (ppm) | 123 | >1,000 | 1,370 |
Cadmium | 130 | 259 | 224 |
Lead | 0.8 | 1.4 | 1.6 |
Zinc | 2.7 | 4.9 | 4.3 |
Table 13.8 Multi-element Assay Results – Lead Concentrate
Composite | Zone 3 & 5 | Zone 5 | Zone 1 & 2 |
Mercury (ppm) | 4.5 | 4.1 | 2.7 |
Arsenic (ppm) | 11,640 | 3,165 | 114 |
Antimony (ppm) | >1,000 | >1,000 | 1,376 |
Cadmium | 169 | 195 | 249 |
Copper | 5.0 | 2.3 | 2.1 |
Zinc | 2.4 | 3.2 | 4.7 |
In the zinc concentrates produced from the locked cycle tests, the cadmium content generally ranges from 2,100 to 3,400 ppm, which will likely be higher than the penalty thresholds outlined by most zinc concentrate smelters. The arsenic content may be higher than the penalty mark in the concentrate produced from Composite Zone 5. However, the mineralization from Zone 5 is not expected to be mined separately, on average; therefore, the arsenic in the zinc concentrate should not attract a penalty.
NovaCopper Inc. | 13-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 13.9 Multi-element Assay Results – Zinc Concentrate
Test | LCT 1 | LCT 2 | LCT 3 | LCT 4 | LCT 5 | LCT 6 |
Composite | Zone 3 & 5 | Zone 3 | Zone 5 | Zone 3 & 5 | Zone 5 | Zone 1 & 2 |
Mercury (ppm) | No Data | No Data | No Data | No Data | No Data | No Data |
Arsenic (ppm) | 688 | 89 | 1310 | 706 | 1,020 | 754 |
Antimony (ppm) | 436 | 184 | 418 | 211 | 584 | 550 |
Cadmium | 3,010 | 3,390 | 3,290 | 3,440 | 2,910 | 2,110 |
Copper | 3.1 | 1.0 | 0.9 | 1.8 | 2.0 | 5.8 |
Lead | 0.6 | 0.4 | 0.6 | 0.4 | 0.8 | 0.5 |
13.1.3 | HISTORICAL TEST WORK REVIEW |
| METALLURGICAL TESTING (1968 TO 1976) |
| |
| Mineralogy |
| |
| Between 1970 and 1976, KRC conducted two initial mineralogical studies to evaluate and identify the potential beneficiation or metallurgical treatment of concentrates of the samples from the deposit. |
| |
| Kennecott Research Center – 1970 |
| |
| In the 1970 mineralogy investigation, KRC reported that the host rock of the mineralization is generally muscovite, chlorite, or talc schist. Principal economic minerals in the deposit were identified as chalcopyrite, sphalerite, and argentiferous galena. Table 13.10 presents a complete list of metallic minerals identified in the Arctic Project samples. |
| |
| Table 13.10Metallic Mineral Identified in Arctic Project Samples |
| Mineral | | | Mineral |
Mineral | Abundance | | Mineral | Abundance |
Chalcopyrite | Very Abundant | | Tennantite | Minor |
Sphalerite | Very Abundant | | Digenite | Minor |
Galena | Common | | Bornite | Minor |
Pyrite | Common | | Covellite | Trace |
Sphene | Common | | Carrollite | Trace |
Rutile | Common | | Glaucodot | Trace |
Pyrrhotite | Minor | | Stromeyerite | Trace |
Marcasite | Minor | | Electrum | Trace |
Arsenopyrite | Minor | | Unidentified | Trace |
Source: KRC 1976
NovaCopper Inc. | 13-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The sizes of sulphide mineral particles in the mineralization sample ranged from submicron to a maximum of several centimetres; most of the sulfide particles were relatively large (coarser than 74 µm). KRC noted that the target sulphide minerals should be liberated from gangue at a primary grind size of 100% passing 100 mesh.
It should be possible to obtain a zinc concentrate that is low in iron and contains most of the cadmium that occurs in the mineralization. There was a close association between chalcopyrite and sphalerite, including some chalcopyrite exsolution particles within the sphalerite grains. Because of this association, some copper was expected to report to the zinc concentrate.
The copper-lead concentrate would contain most of the silver, gold, nickel, and cobalt that is recovered from the mineralization. A major portion of the silver in the mineralization occurs in galena. In addition, some silver minerals were physically attached to galena particles. Because of these associations, the silver will tend to go with the lead in any further concentration of lead from the copper-lead concentrate. Nickel and cobalt recovered in the flotation concentrates were expected to follow the copper minerals.
Kennecott Research Center – 1975
The objective of the 1975 test program was to identify potential problems that might influence beneficiation of the mineralization.
A detailed mineralogical examination was conducted on 88 drill core samples. The mineralogical observations are summarized as follows:
| • | Large variations in mineralogy occur both vertically and laterally within the deposit. |
| | |
| • | A significant portion of the chalcopyrite is severely interlocked with either sphalerite or galena. |
| | |
| • | Pyrite contains abundant base metal sulphide inclusions. |
| | |
| • | Silver is present in galena and in tetrahedrite. |
| | |
| • | Arsenic and antimony can be expected in the concentrates due to the presence of arsenopyrite and tetrahedrite/tennantite. |
| | |
| • | Trace quantities of nickel and bismuth sulphides were observed. |
The important sulphide minerals are pyrite, sphalerite, chalcopyrite, galena, pyrrhotite and arsenopyrite.
The following potential problems were identified:
| • | It may be difficult to liberate chalcopyrite from sphalerite. |
| | |
| • | Abundant base metal sulphide inclusions in pyrite may make it difficult to reject this mineral by flotation. |
NovaCopper Inc. | 13-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | It may be difficult to liberate galena from chalcopyrite. |
| | |
| • | Silver values are present in both tetrahedrite and galena. |
| | |
| • | Flotation of arsenopyrite and tetrahedrite-tennantite may cause elevated arsenic and antimony in the concentrates. |
| | |
| • | Trace quantities of nickel and bismuth minerals were observed in the mineralization. |
Comminution Test Work
In 1976, KRC conducted preliminary comminution test work using the standard Bond Work Index determination procedure.
Table 13.11 shows the results of the BWi tests. Mineralization from the Arctic Deposit is relatively soft, with a Bond Work Index in the range of 5.7 to 12.0 kWh/t.
Table 13.11 Bond Ball Mill Work Index
Hole No. | Work Index (kWh/t) | Talc (%) |
11B | 11.96 | 90 |
34B | 8.33 | 50 |
34B | 5.71 | 5 |
34B | 11.3 | Mainly Talc |
34C | 9.98 | Nil |
48A | 10.5 | Mainly Sulphide |
48B | 9.60 | 20 |
Source: KRC 1976
Various observations from the grindability tests conducted during the KRC 1976 test program are summarized as follows:
• | Wet bulk material is expected to be quite sticky and would require special consideration with regard to screen blinding and clogging conveyor belts and chutes. |
| |
• | Arctic samples that contain talc may cause some difficulty during grinding because the talc may flatten into flakes rather than breaking, which may cause grinding and classification problems. |
| |
• | The sample that contained mainly talc did not respond in the normal manner to the standard Bond Work Index laboratory determination. |
Flotation Test Work
Between 1968 and 1976, KRC carried out initial amenability testing. The focus was on selective flotation to provide separate copper, lead, and zinc concentrates for conventional smelting. In 1968, initial amenability testing was conducted on core composites from eight diamond drill holes (which is not available to review). Other tests were conducted in 1972 on four composites from three additional diamond core holes. The laboratory-scale tests conducted between 1968 and 1976 included the conventional selective flotation approach to produce separate lead, copper and zinc concentrates.
NovaCopper Inc. | 13-16 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The major problem encountered for the tests by KRC was the separation between lead and copper minerals, and the reduction of zinc deportment to the copper and lead concentrates. The copper concentrates produced from open circuit tests contained 30 to 32.4% copper, 0.45 to 3.48% zinc and 0.15% to 1.31% lead. The copper recoveries were less than 80.7%. The lead concentrate grades were low, ranging from 17.1 to 36.5%.
Sphalerite flotation was generally efficient, producing zinc flotation concentrates grading approximately 55% zinc. Because of the low gold content of the test samples, no appraisal was made of gold recoveries.
From 1975 and 1976, large diameter cores from 14 drill holes were used for more detailed testing. Two composites labelled as Composite No. 1 (Eastern Zone) and Composite No. 2 (Western Zone), were prepared. The test program included bench-scale testing of various process parameters for sequential flotation, including locked cycle tests. A talc flotation step prior to sulfide flotation was considered to be necessary, as previously established. It was determined that chalcopyrite and sphalerite could be recovered into separate commercial grade copper and zinc concentrates. However, the production of a selective high grade lead concentrate was not successful.
Using zinc sulphate and sodium bisulphate to suppress galena and sphalerate, 90% of the copper was recovered into a concentrate containing 26% copper, 1.5% lead, and 6% zinc. KRC indicated that because of close interlocking of chalcopyrite and sphalerite, the zinc content of the copper concentrate could not be reduced to below 6% without sacrifice of copper recovery.
Only low-grade silver-bearing lead concentrates were obtained. Under the best test conditions, approximately 65% of the silver reported to the low-grade lead concentrate. Some of the silver in the mineralization occurred as tetrahedrite, which was recovered to the copper concentrate.
It appeared that zinc minerals responded well to the test procedure.
METALLURGICAL TEST WORK (1998 TO 1999)
In 1999, Lakefield conducted a metallurgical test program to confirm and improve upon the results from the 1970s KRC test work program. The Lakefield work was carried out on test composites from the Arctic Deposit prepared from three separate drill holes. The test composite from the upper portion of AR-72 was identified as being low in talc content; however, composites from the lower portion of AR-72 were high in talc content, as were AR-74 and AR-75. The head analyses for the respective resulting test composites are summarized in Table 13.12.
NovaCopper Inc. | 13-17 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 13.12 Head Analyses
Composite | Talc | Cu (%) | Zn (%) | Pb (%) | Fe (%) | ST (%) | Au (g/t) | Ag (g/t) |
Hole #72 – Upper | Low | 5.28 | 7.16 | 1.86 | 15.6 | 1.14 | 72.3 | 23.4 |
Hole #72 – Lower | High | 2.68 | 5.85 | 1.34 | 13.0 | 1.60 | 75.9 | 16.9 |
Hole #74 | High | 2.46 | 4.43 | 0.90 | 17.0 | 1.55 | 45.1 | 23.7 |
Hole #75 | High | 2.35 | 8.36 | 1.95 | 15.7 | 1.23 | 77.3 | 21.8 |
| Note: | ST= total sulphur |
| Source: | Lakefield 1999 |
Low Talc Composite Flotation
Lakefield conducted a series of five tests on the low talc mineralized composite. The following parameters were used for all tests:
| • | MIBC was used in the talc pre-float. |
| | |
| • | Sulphur dioxide was used in the copper-lead flotation circuit. |
| | |
| • | A grind size of approximately 80% passing 53 µm was used. |
| | |
| • | Bulk copper-lead flotation was included, followed by zinc flotation. |
The bulk copper-lead rougher concentrate was reground and subjected to two stages of cleaner flotation and one stage of copper and lead separation, using zinc oxide and sodium cyanide to depress the copper while floating the lead. The resulting lead rougher concentrate was upgraded with two stages of cleaner flotation to produce the final lead concentrate. The lead rougher flotation tailings were the final copper concentrate.
The zinc rougher concentrate was reground and upgraded with two stages of cleaner flotation. The results of the best open circuit flotation test for the low talc composite are summarized in Table 13.13. The test results showed that:
| • | Copper concentrate produced contained 29% copper. 86.8% of the copper was recovered to the concentrate. |
| | |
| • | The lead concentrate recovered 68% of the lead. |
The zinc concentrate that was produced from the open circuit test contained 59.1% zinc.
NovaCopper Inc. | 13-18 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 13.13 Flotation Test on Ambler Low Talc Composite
Item | Weight (%) | Assays | Distribution (%) |
Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) | Cu | Pb | Zn | Au | Ag |
Lead Concentrate | 2.22 | 6.5 | 58.8 | 3.43 | 38.9 | 1,703 | 2.7 | 68.1 | 1.1 | 48.7 | 47.3 |
Copper Concentrate* | 15.76 | 29.1 | 1.2 | 2.61 | 1.23 | 73.5 | 86.8 | 9.8 | 5.7 | 10.9 | 14.5 |
Zinc Concentrate | 9.91 | 0.44 | 0.36 | 59.1 | 0.65 | 14.7 | 0.8 | 1.9 | 81.1 | 3.6 | 1.8 |
Zinc Tailings** | 61.6 | 0.11 | 0.13 | 0.22 | 0.4 | 3.47 | 1.2 | 4.3 | 1.9 | 13.7 | 2.7 |
Head (Calculation) | 100.0 | 5.28 | 1.92 | 7.21 | 1.78 | 80.1 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Source: | Lakefield 1999. |
| Notes: | *Pb Rougher Tailings |
| | **Does not include intermediate cleaner tailings |
High Talc Composite Flotation
Lakefield also conducted flotation tests on each of the high talc composites using a test procedure similar to the one used for the low talc composite, with the exception that carboxymethyl cellulose (CMC) was added as a depressant for talc. The results of these tests showed that the presence of talc had a significant negative impact on the copper and lead mineral recoveries. Lakefield also used talc pre-flotation prior to sulphide flotation in an effort to reduce talc effect on base metal flotation. It appears that the talc pre-flotation improved copper and lead metallurgical performances. However, the test results showed that an elevated talc content had a significant effect in copper and lead flotation response.
In the test report, Lakefield also concluded that:
| • | A grind particle size as coarse as approximately 80% passing 74 µm provided good results. |
| • | Copper-lead separation was difficult using a cyanide compound with the talc mineralization due to the talc and perhaps soluble copper as well. |
13.2 | RECOMMENDED TEST WORK |
In general, the flowsheet developed in the 2012 test program is feasible for the Arctic mineralization. Tetra Tech recommends further metallurgical test work on representative samples to optimize flowsheet and process conditions and determine the design related parameters required for further studies. The recommended test work is shown in Section 26.3.
NovaCopper Inc. | 13-19 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.0 | MINERALRESOURCEESTIMATES |
The Mineral Resource Statement presented herein represents the latest in a series of mineral resource evaluations filed by Kennecott, NovaGold and NovaCopper for the Arctic Project, starting from 1990 (Randolf 1990), 2008 (SRK 2008), 2011 (SRK 2011) and most recently 2012 (SRK 2012). The mineral resource estimate which formed the basis of this PEA was completed by Mike O’Brien, Pr.SciNat (SACNASP#400295/87); the overall effective date of this resource estimate is July 30, 2013.
The mineral resource model prepared by Tetra Tech considers diamond drill holes drilled by different operators during the period 1965 to 2011. The majority of the assaying has been completed in recent years by NovaCopper and its previous parent company NovaGold. The mineral resource for the Arctic Project is supported by 43 core holes (approximately 13,500 m) drilled by NovaGold and 92 core holes (approximately 17,600 m) drilled by previous owners Kennecott, and/or a Kennecott subsidiary.
The geological and assay database used to estimate the Arctic Project mineral resources have been reviewed and audited by Tetra Tech. It is Tetra Tech’s opinion that the current drilling information is sufficiently reliable to interpret with confidence the boundaries for VMS mineralization and that the assay data are sufficiently reliable to support mineral resource estimation.
Leapfrog™ software (version 2.5.1) was used to review and verify the resource estimation domains, prior to being imported into Isatis™ software (version 2012.1) to prepare assay data for geostatistical analysis, variography, block model construction, metal grade estimation and mineral resource tabulation. Mineral Resources were estimated into five MS and six SMS lenses, and then combined with waste for an overall grade for the 10 m by 10 m by 5 m block. Extreme lead and gold assays were capped prior to compositing. OK and ID2 estimates were run, with OK used for resource reporting and ID2 used for validation. Search parameters were constrained within each mineralized domain and required an optimum number of 15 composites, minimum number of 5 composites, minimum number of 2 drill holes, and maximum search distance range of 200 m. In general, blocks categorized as Indicated were supported by at least two drill holes within a 75 m search radii, and blocks categorized as Inferred were supported by at least 2 drill holes within a 150 m search radii.
NovaCopper Inc. | 14-1 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
This section describes the resource estimation methodology and summarizes the key assumptions considered by Tetra Tech. In Tetra Tech’s opinion, the resource evaluation reported herein is a sound representation of the copper/zinc/lead/gold/silver mineral resources found on the Arctic Project at the current level of sampling. The mineral resources have been estimated in conformity with generally accepted CIM “Estimation of Mineral Resource and Mineral Reserves Best Practices” guidelines.
14.2 | PREVIOUS RESOURCE ESTIMATES |
Differences between the previously reported mineral resource estimate (SRK 2012) and the current resource estimate are primarily related to additional drilling, updated geological interpretation, additional specific gravity determinations, and reporting of grades and tonnes within an open pit designed to support the requirements for reasonable prospects for economic extraction.
Previous resource estimates for the Arctic Deposit, which includes work completed by Randolf (1990), and SRK (2008, 2011 and 2012), were intended to support an underground mining concept. Consequently the resource estimates focussed on the high grade portions of the zones, and did not consider the potential amenability of the mineral resources to open pit mining methods.
14.2.1 | KENNECOTT (1990) RESOURCE ESTIMATE |
The historic resource estimates are considered relevant but not necessarily reliable. In each case, a significant amount of resampling and verification is required to upgrade or verify the historical estimate as current mineral resources or mineral reserves. Please note that a QP has not done sufficient work to classify any of the historical estimates as current mineral resources or mineral reserves and the issuer is not treating the historical estimates as current mineral resources or mineral reserves.
In 1990, Kennecott completed a resource estimate for the Arctic Deposit based on 70 core holes. This resource estimate is summarized in Table 14.1 and considered to be an Inferred Resource. This historical resource estimate pre-dates the development of NI 43-101 reporting guidelines and was not estimated in compliance with NI 43-101 procedures and should not be relied upon (Randolf 1990).
Table 14.1 Historical Resource Estimate
Classification | Tonnes (kt) | Cu (%) | Zn (%) | Pb (%) | Ag (ppm) | Au (ppm) |
Inferred | 36,300 | 4.0 | 5.5 | 0.8 | 54.9 | 0.7 |
Source: Randolf (1990)
14.2.2 | SRK (2008) RESOURCE ESTIMATION |
In February 2008, NovaGold filed an NI 43-101 compliant resource authored by SRK for the Arctic Deposit. The estimation utilized 119 core holes, of which, 4,808 intervals were sampled representing 9,128 m of sampled drilling. Sample lengths varied from 0.1 to 12 m, and averaged about 1.9 m. Each interval contained assays for copper, zinc, lead, gold and silver, as well as codes for lithology and mineralized zone. Assays were capped based on the drill hole assay statistics presented in Table 14.2.
NovaCopper Inc. | 14-2 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 14.2 Drill Hole Assay Statistics – 2008 SRK Resource Estimation
Category | Length (m) | Cu (%) | Zn (%) | Pb (%) | Au (ppm) | Ag (ppm) |
Uncut | Cap 15 | Uncut | Cap 18 | Uncut | Cap 4 | Uncut | Cap 7 | Uncut | Cap 190 |
Host | 19,703.45 | 0.07 | 0.07 | 0.06 | 0.06 | 0.01 | 0.01 | 0.01 | 0.01 | 1.09 | 1.09 |
Sulphide | 1,077.11 | 3.77 | 3.76 | 6.05 | 6.04 | 0.94 | 0.93 | 0.83 | 0.75 | 56.86 | 55.81 |
Total | 20,780.56 | 0.26 | 0.26 | 0.37 | 0.37 | 0.06 | 0.06 | 0.06 | 0.05 | 3.98 | 3.93 |
Number Capped | | 4 | | 8 | | 9 | | 3 | | 5 |
Downhole surveys were recorded at 15 to 45 m intervals for the majority of the drill holes. A standard “typical deviation” was applied to 40 holes, which were unsurveyed.
Due to the large discrepancy between previous Kennecott SG measurements, a more extensive field SG program was implemented by NovaGold in 2004, the results of which are tabulated along with the 1998 Kennecott data in Table 14.3.
Table 14.3 Historical SG Data Statistics – Arctic Deposit: 1998–2004
Program | MS >50% Sulphide (Average g/cm3) |
No. of Samples | SMS <50% Sulphide (Average g/cm3) |
No. of Samples | Lithologies (Average g/cm3) |
No. of Samples |
1998 Lab (Chemex, Golder) | 4.37 | 15 | 4.02 | 7 | 2.84 | 16 |
2004 Field | 4.40 | 35 | 3.84 | 19 | 2.83 | 73 |
2004 Lab (Chemex) | 4.06 | 121 | 3.36 | 77 | 2.85 | 66 |
All Programs | 4.16 | 171 | 3.49 | 103 | 2.84 | 155 |
Note: MS = massive sulphide; SMS = semi-massive sulphide
For the purpose of the 2008 resource estimate, non-rejected SG measurements were categorized by rock type and vary from 2.62 to 4.87 with an average of 4.2 for MS and SMS. Actual values within each zone were used to interpolate SG into the block model using ID2 but, where SG sample density was too sparse, a default value of 4.2 was used in the mineralized zones. A default of 2.9 was used for all host rock, which was the average SG of non-rejected quartz mica schist samples. SG measurements are shown by rock type in Table 14.4.
Table 14.4 SG Measurements Categorized by Rock Type
Rock Category | Count | Average | Max | Min |
MS+SMS | 77 | 4.2 | 4.87 | 2.84 |
Non-MS/SMS | 93 | 2.9 | 4.26 | 2.62 |
NovaCopper Inc. | 14-3 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Five zones representing MS lenses were modelled and composites were created at 1 m down hole intervals, broken at changes in zone codes. General directional variograms were generated for each element and, due to the drill spacing and orientation, the best variograms are in the orientation of azimuth 150°, plunge 30°, with ranges of 40 to 50 m in all elements except gold, which had a range of 25 m.
Grades were estimated using OK and a spherical search restricted within the zones. Multiple passes were used (50, 100, and 150 m) to fill as many blocks as possible within the zones. The first search pass used a minimum of two samples, with no more than three from any one drill hole; the second two passes did not have a number per drill hole restriction.
After the metal grades were estimated, a simplified Gross Metal Value (GMV) was calculated based on metal prices applied to each individual grade. The GMV was equal to the sum of each grade multiplied by the value of the metal unit. A $100 GMV cut-off was selected for the resource cut-off grade based on the assumption of underground mining methods.
Resources in the mineral zones, which were estimated by the first (50 m) search, were classified as Indicated resources, roughly based on a distance that was twice the variogram range and within one cross section distance inside a modelled shape. All blocks outside of the mineral zones, and all other estimated blocks too distant from the samples for the first pass, were classified as Inferred resources. The resource statement is shown in Table 14.5 at $100 GMV cut-off.
Table 14.5 Arctic Deposit Resources at $100 GMV Cut-off – 2008 SRK
Resource | Grade | Contained Metal |
Zone | kt | Cu (%) | Zn (%) | Pb (%) | Ag (g/t) | Au (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Ag (koz) | Au (koz) |
Indicated |
Zone 1 | 5,294 | 4.56 | 6.45 | 1.05 | 62.8 | 0.956 | 533 | 752 | 122 | 10,684 | 163 |
Zone 2 | 2,982 | 4.36 | 5.82 | 0.80 | 45.8 | 0.521 | 287 | 383 | 53 | 4,387 | 50 |
Zone 3 | 1,957 | 3.66 | 6.00 | 0.93 | 51.2 | 0.522 | 158 | 259 | 40 | 3,220 | 33 |
Zone 4 | 6,092 | 3.82 | 6.00 | 0.98 | 68.7 | 1.008 | 513 | 805 | 131 | 13,451 | 197 |
Zone 11 | 517 | 4.16 | 3.32 | 0.34 | 32.9 | 0.254 | 47 | 38 | 4 | 546 | 4 |
Total Indicated | 16,841 | 4.14 | 6.03 | 0.94 | 59.6 | 0.826 | 1,538 | 2,237 | 350 | 32,289 | 447 |
Inferred |
Zone 0 | 1,162 | 2.21 | 2.27 | 0.69 | 4.2 | 0.333 | 57 | 58 | 18 | 156 | 12 |
Zone 1 | 3,163 | 3.92 | 5.75 | 0.93 | 55.0 | 0.760 | 273 | 401 | 65 | 5,596 | 77 |
Zone 2 | 1,559 | 4.06 | 5.60 | 0.74 | 43.4 | 0.433 | 139 | 193 | 25 | 2,176 | 22 |
Zone 3 | 1,307 | 3.83 | 5.13 | 0.63 | 48.1 | 0.438 | 110 | 148 | 18 | 2,021 | 18 |
Zone 4 | 4,382 | 3.34 | 5.03 | 0.84 | 58.4 | 0.891 | 323 | 486 | 81 | 8,224 | 126 |
Zone 11 | 370 | 4.27 | 3.32 | 0.36 | 33.8 | 0.293 | 35 | 27 | 3 | 402 | 3 |
Total Inferred | 11,944 | 3.56 | 4.99 | 0.80 | 48.4 | 0.674 | 937 | 1,313 | 210 | 18,575 | 259 |
NovaCopper Inc. | 14-4 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Notes: | 1. | g/t=ppm. |
| | 2. | The effective date of this mineral resource estimate is January 31, 2008. |
| | 3. | Inferred resources have a great amount of uncertainty as to their existence and as to whether they can be mined legally or economically. It cannot be assumed that all or any part of Inferred resources will ever be upgraded to a higher category. |
| | 4. | Mineral resources that are not mineral reserves do not have demonstrated economic viability. |
| | 5. | This mineral resource estimate assumes metal prices of $2.25/lb copper, $525/oz gold, $9.50/oz silver, $0.55/lb lead and $1.05/lb zinc. |
14.2.3 | SRK (2011) RESOURCE ESTIMATION UPDATE |
In 2011, as part of a PEA of the Arctic Project as a potential underground mining operation, SRK re-stated the 2008 resource for NovaGold using slightly different classification criteria based on a NSR calculation utilizing updated operating costs and then current metal pricing. Though the block model estimation did not change, reported resources were updated. Table 14.6 shows the mineral resource estimate as reported May 9, 2011.
Table 14.6 Arctic Deposit Resources at $75 NSR Cut-off – 2011 SRK
Resource | Grade | Contained Metal |
Zone | kt | Cu (%) | Zn (%) | Pb (%) | Ag (g/t) | Au (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Ag (koz) | Au (koz) |
Indicated |
Zone 1 | 5,293 | 4.56 | 6.45 | 1.05 | 62.77 | 0.96 | 533 | 752 | 122 | 10,683 | 163 |
Zone 2 | 2,982 | 4.36 | 5.82 | 0.80 | 45.76 | 0.52 | 287 | 384 | 53 | 4,387 | 50 |
Zone 3 | 1,964 | 3.66 | 5.98 | 0.93 | 51.02 | 0.52 | 158 | 259 | 40 | 3,222 | 33 |
Zone 4 | 6,089 | 3.82 | 6.00 | 0.98 | 68.71 | 1.01 | 513 | 805 | 131 | 13,451 | 197 |
Zone 11 | 517 | 4.16 | 3.32 | 0.34 | 32.86 | 0.25 | 47 | 38 | 4 | 546 | 4 |
Total Indicated | 16,845 | 4.14 | 6.02 | 0.94 | 59.62 | 0.83 | 1,538 | 2,237 | 350 | 32,289 | 447 |
Inferred |
Zone 0 | 1,191 | 2.18 | 2.24 | 0.70 | 4.17 | 0.34 | 57 | 59 | 18 | 159 | 13 |
Zone 1 | 3,166 | 3.91 | 5.74 | 0.93 | 54.98 | 0.76 | 273 | 401 | 65 | 5,596 | 77 |
Zone 2 | 1,559 | 4.06 | 5.60 | 0.74 | 43.40 | 0.43 | 139 | 193 | 25 | 2,175 | 22 |
Zone 3 | 1,307 | 3.83 | 5.13 | 0.63 | 48.08 | 0.44 | 110 | 148 | 18 | 2,020 | 18 |
Zone 4 | 4,492 | 3.28 | 4.95 | 0.83 | 57.56 | 0.87 | 325 | 490 | 82 | 8,312 | 126 |
Zone 11 | 373 | 4.25 | 3.30 | 0.35 | 33.65 | 0.29 | 35 | 27 | 3 | 404 | 3 |
Total Inferred | 12,087 | 3.56 | 4.94 | 0.79 | 48.04 | 0.67 | 940 | 1,317 | 212 | 18,667 | 260 |
| Notes: | 1. | g/t=ppm. |
| | 2. | Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. There is no certainty that all or any part of the Mineral Resources will be converted to Mineral Reserves. |
| | 3. | Resources stated as contained within potentially economically minable underground shapes above a US$75.00/t NSR cut-off. |
| | 4. | NSR calculation is based on assumed metal prices of $2.50/lb for copper, $1,000/oz for gold, $16.00/oz for silver, $1.00/lb for zinc and $1.00/lb for lead. A mining cost of $45.00/t and combined processing and G&A costs of $31.00 were assumed to form the basis for the resource NSR cut-off determination. |
| | 5. | Mineral resource tonnage and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding. |
NovaCopper Inc. | 14-5 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.2.4 | SRK (2012) RESOURCE ESTIMATION UPDATE |
| In 2012, as a result of the spinoff of NovaCopper from NovaGold, NovaCopper commissioned SRK to further update the 2011 Arctic Project PEA. |
| |
| The 2012 mineral resource was developed from a drill hole database consisting of 131 core holes, 108 of which intercepted significant mineralization. Of the 28,350 m drilled within the Arctic Deposit, 6,220 intervals were sampled, representing 12,434 m of sampled drilling. No other changes were made to the 2008 SRK estimation methodology and criteria as previously outlined. There were no changes made to the classification criteria, and no adjustments were made to metal pricing or operating costs related to the 2011 PEA. Table 14.7 shows the mineral resource estimate as reported March 9, 2012. |
| |
| Table 14.7Arctic Deposit Resources at $75 NSR Cut-off – 2012 SRK |
Resource | Grade | Contained Metal |
Zone | kt | Cu (%) | Zn (%) | Pb (%) | Ag (g/t) | Au (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Ag (koz) | Au (koz) |
Indicated | | | | | | | | | | | |
Zone 1 | 5,667 | 4.50 | 6.15 | 1.06 | 63.39 | 0.91 | 562 | 768 | 132 | 11,549 | 165 |
Zone 2 | 3,792 | 4.55 | 6.05 | 0.97 | 50.79 | 0.52 | 380 | 505 | 81 | 6,193 | 63 |
Zone 3 | 2,448 | 3.56 | 5.56 | 0.91 | 53.69 | 0.67 | 192 | 300 | 49 | 4,226 | 53 |
Zone 4 | 7,020 | 3.57 | 65.68 | 0.96 | 65.18 | 0.96 | 553 | 880 | 149 | 14,711 | 216 |
Zone 11 | 517 | 4.16 | 3.32 | 0.34 | 32.86 | 0.25 | 47 | 38 | 4 | 546 | 4 |
Total Indicated | 19,445 | 4.05 | 5.81 | 0.97 | 59.55 | 0.80 | 1,735 | 2,491 | 415 | 37,226 | 501 |
Inferred |
Zone 0 | 1,242 | 2.16 | 2.19 | 0.70 | 4.14 | 0.35 | 59 | 60 | 19 | 165 | 14 |
Zone 1 | 2,918 | 3.82 | 5.53 | 0.92 | 53.83 | 0.70 | 246 | 356 | 59 | 5,050 | 66 |
Zone 2 | 1,386 | 4.16 | 5.90 | 0.79 | 45.43 | 0.39 | 127 | 180 | 24 | 2,025 | 18 |
Zone 3 | 1,177 | 3.99 | 5.04 | 0.61 | 48.45 | 0.47 | 104 | 131 | 16 | 1,833 | 18 |
Zone 4 | 4,313 | 3.18 | 4.88 | 0.83 | 55.33 | 0.84 | 302 | 464 | 79 | 7,672 | 116 |
Zone 11 | 373 | 4.25 | 3.30 | 0.35 | 33.66 | 0.29 | 35 | 27 | 3 | 404 | 3 |
Total Inferred | 11,409 | 3.47 | 4.84 | 0.80 | 46.75 | 0.64 | 873 | 1,217 | 201 | 17,149 | 235 |
| Notes: | 1. | g/t=ppm. |
| | 2. | Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability. There is no certainty that all or any part of the Mineral Resources will be converted to Mineral Reserves. |
| | 3. | Resources stated as contained within potentially economically minable underground shapes above a US$75.00/t NSR cut-off. |
| | 4. | NSR calculation is based on assumed metal prices of $2.50/lb for copper, $1,000/oz for gold, $16.00/oz for silver, $1.00/lb for zinc and $1.00/lb for lead. A mining cost of $45.00/t and combined processing and G&A costs of $31.00 were assumed to form the basis for the resource NSR cut-off determination. |
| | 5. | Mineral resource tonnage and contained metal have been rounded to reflect the accuracy of the estimate, and numbers may not add due to rounding. |
NovaCopper Inc. | 14-6 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.3 | RESOURCE ESTIMATION PROCEDURES |
The resource evaluation methodology involved the following procedures:
| • | database compilation and verification |
| • | review and construction of wireframe models |
| • | definition of resource domains |
| • | geostatistical analysis and variography |
| • | block modeling and grade interpolation |
| • | SG modelling and ABA assignment |
| • | resource classification and validation |
| • | assessment of “reasonable prospects for economic extraction” and selection of |
| | appropriate cut-off grades |
| • | preparation of the mineral resource statement. |
The Arctic database was provided to Tetra Tech in a Microsoft Excel format (.csv). These .csv files contain collar, survey, assay, lithology, mineralization, specific gravity, and geotechnical data collected by NovaGold/NovaCopper and confirmed by Tetra Tech (see Section 12.1). The current drill hole database within the resource area consists of almost 10,323 samples from 135 drill holes. Table 14.8 provides a summary of the database used for the Arctic resource estimation.
Table 14.8 Exploration Data within the Resource Area
Company
|
Year
|
No. of Drill Holes
|
No. of Samples
| Total Sample Length (m)
|
Kennecott (BCMC) | 1967 to 1985 | 86 | 3,306 | 4,175 |
Kennecott | 1998 | 6 | 548 | 964 |
NovaGold | 2004 to 2008, 2011 | 43 | 6,469 | 16,564 |
Review of the database led Tetra Tech to the modification of the database for the resource estimation, as shown in Table 14.9.
Table 14.9 Modifications to Database for Resource Estimation
Action | Records Affected |
Missing assay values, set to zero | 57 |
NovaCopper Inc. | 14-7 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
SG measurements have been collected by Kennecott (1998 and 1999) and NovaGold (2004 and 2011). By far the largest data set has been collected by NovaGold. Basic statistical analysis indicates there are no significant differences between the paired Kennecott and recently collected NovaGold SG values, or between the various measurement techniques.
Geological modelling focused on the distribution of mineralization (massive and semi-massive sulphide), specific gravity and lithogeochemical models. NovaCopper supplied wireframes (.dxf files) of the topography and the geological models to Tetra Tech, who imported and verified the wireframes in Leapfrog™ software (version 2.5.1) prior to importing into Isatis™ software (version 2012.1) for use as estimation domain boundaries. The final estimation domain models represent a combination of these models with a specific focus on the mineralization domains for grade interpolation.
14.5.1 | MINERALIZATION MODEL |
In 2013, NovaCopper geologists updated the mineralization models, representing massive and semi-massive VMS-style mineralization. Geometrically, the mineralization is confined to six lenticular mineralized zones concentrated along an isoclinal fold hinge. Five of the six SMS zones contain a core of MS material (Figure 14.1).
14.5.2 | SPECIFIC GRAVITY MODEL |
In 2013, NovaCopper geologists recognized the effect of barium alteration on SG determinations. Using the geochemical and SG database, a total of four high-density (more than 3.5) SG domains were defined and modeled for the 2013 resource update (Figure 14.1)
14.5.3 | LITHOGEOCHEMICAL MODEL |
In 2013, NovaCopper geologists updated the lithogeochemical model (Twelker 2008) to include the 2011 drill results. Lithogeochemistry shows three major felsic rock suites in the Arctic Deposit area: a rhyolite suite; and intermediate volcanic suite and a volcanoclastic suite. NovaCopper currently models the following seven domains within the resource area: Undifferentiated Upper Plate, Felsite Top, Felsite Upper Limb, Felsite Fold, MRP Upper Limb, MRP Lower Limb and Grey Schist (Figure 14.1).
NovaCopper Inc. | 14-8 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.1 Cross-section Illustrating the Arctic Deposit Geological Model
The final domain model, based on the mineralization, SG, and lithogeochemical models comprises 11 grade estimation domains, 11 SG estimation domains, and 9 ABA domains. Grade estimation domains are based on mineralization models. SG estimation domains are based on a combination of SG and mineralization models. ABA domains are based on a combination of lithogeochemical and mineralization models.
To test the validity of these models, and to determine the ideal method for treating the wireframe boundaries, contact profiles were generated and are discussed in Section 14.6.
The description of each domain and the equivalent coded value is listed in Table 14.10 to Table 14.12.
Table 14.10 Arctic Grade Estimation Domains
Name | Type | Domain | Volume (m3) | Thickness (m) |
Amb1 | SMS | 10 | 2,097,100 | - |
Amb1 | MS | 11 | 1,155,500 | - |
Amb1 | Total | - | 3,252,600 | 6.5 |
Amb2 | SMS | 20 | 233,601 | - |
table continues…
NovaCopper Inc. | 14-9 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Name | Type | Domain | Volume (m3) | Thickness (m) |
Amb2 | MS | 21 | 68,129 | - |
Amb2 | Total | - | 301,730 | 4.2 |
Amb3 | SMS | 30 | 1,954,481 | - |
Amb3 | MS | 31 | 865,319 | - |
Amb3 | Total | - | 2,819,800 | 6.5 |
Amb4 | SMS | 40 | 372,150 | - |
Amb4 | MS | 41 | 160,380 | - |
Amb4 | Total | - | 532,530 | 7.0 |
Amb5 | SMS | 50 | 3,225,515 | - |
Amb5 | MS | 51 | 41,285 | - |
Amb5 | Total | - | 3,266,800 | 5.6 |
Amb5a | SMS | 60 | 11,479 | - |
Amb5a | MS | - | - | - |
Amb5a | Total | - | 11,479 | 0.7 |
Total | SMS | - | 7,894,326 | - |
Total | MS | - | 2,302,092 | - |
Total | Total | - | 10,196,418 | 6.0 |
Note: MS = massive sulphide; SMS = semi-massive sulphide
Table 14.11 Arctic SG Estimation Domains
Name | Type | Domain | Volume (m3) |
SG0 | waste | 0 | Country Rock Volume |
SG1 | SMS | 1 | 7,100,500 |
SG2 | MS+HighSG | 2 | 3,208,500 |
Table 14.12 Arctic ABA Domains
Wireframe | Description | Material Code |
U Plate 2013 | Undif. Upper Plate 50/50 split between MRP and Upper Felsite | 1 |
Fels1-Top 2013 | Felsite Top | 2 |
MRP-Upper 2013 | MRP Upper Limb | 3 |
Fels1_Upper 2013 | Felsite Upper Limb | 4 |
GS 2013 | Waste Grey Schist | 5 |
Fels1-fold core 2013 | Felsite Fold | 6 |
MRP-Lower 2013
| MRP Lower Limb – PAG/NAG Upper Limb ratios assumed | 7 |
If Material Code = 5 and Waste % < 100 then PAG | 8 |
NovaCopper Inc. | 14-10 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.6 | EXPLORATORY DATA ANALYSIS |
| |
14.6.1 | CONTACT PROFILES |
| Contact profiles were generated to test the validity of the wireframe models and to determine the ideal method for treating wireframe boundaries. Despite the narrow domains, the mineralization domains display hard boundaries with the wallrock for all metals of interest (as shown in Figure 14.2). Contact profiles also display hard boundaries between the MS and SMS domains (as shown in Figure 14.3). |
| |
| Figure 14.2Contact Profile between Zone 1 SMS and Country Rock for Copper |
Note: Numbers on graph are numbers of samples.
NovaCopper Inc. | 14-11 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.3 Contact Profile between Zone 1 SMS and MS for Zinc
Note: Numbers on graph are numbers of samples.
14.6.2 | RAW ASSAY DATA AND STATISTICS |
Table 14.13 and Table 14.14 summarizes the raw drill hole assay and length statistics for the Arctic grade domains. They are tabulated by assayed metals copper, zinc, lead, gold and silver as well as by mineralization domain.
NovaCopper Inc. | 14-12 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 14.13 Raw Metal Sample Statistics (Length Weighted)
Mineralization Domain | Metal | Count | Minimum Grade | Maximum Grade | Mean Grade | Standard Deviation of Grade |
SMS | Cu (%) | 1,965 | 0.00 | 19.60 | 2.78 | 2.94 |
| Zn (%) | 1,938 | 0.00 | 20.80 | 3.51 | 4.41 |
| Pb (%) | 1,894 | 0.00 | 6.11 | 0.62 | 0.86 |
| Au (g/t) | 1,846 | 0.00 | 32.80 | 0.74 | 2.31 |
| Ag (g/t) | 1,942 | 0.17 | 669.00 | 42.32 | 54.79 |
MS | Cu (%) | 1,045 | 0.01 | 18.35 | 4.49 | 3.27 |
| Zn (%) | 1,036 | 0.02 | 25.60 | 7.56 | 5.31 |
| Pb (%) | 1,019 | 0.00 | 8.04 | 1.26 | 1.16 |
| Au (g/t) | 985 | 0.00 | 17.00 | 0.90 | 0.99 |
| Ag (g/t) | 1,033 | 0.17 | 599.99 | 76.12 | 61.56 |
Table 14.14 Sample Length Statistics
Mineralization Domain | Count | Minimum (m) | Maximum (m) | Mean (m) | Standard Deviation | Variance |
SMS | 1966 | 0.01 | 3.23 | 0.62 | 0.60 | 0.36 |
MS | 1045 | 0.01 | 3.10 | 0.64 | 0.60 | 0.35 |
Inspection of the raw assay data indicates that a common composite length of 2 m accommodates most sample lengths as the majority of sample lengths are less than 2 m in length. For resource estimation, the sample data was composited into a 2 m standard composite length for the deposit for the eleven individual mineralized semi-massive and massive sulphide zones.
14.7.1 | OUTLIER MANAGEMENT AND CAPPING STRATEGY |
When dealing with skewed populations, as well as outliers to the distribution, it is common practice in the industry to restrict the influence of high grade assays through “top-cutting” or “capping”. Capping was implemented on the 2 m composite assay data after sample length compositing. Capping limits were chosen for gold (six composites) and lead (one composite) as a function of the continuity-discontinuity of the high-grade “tail” of the metals histograms. Silver, copper and zinc were not capped.
The Arctic Deposit lead histogram high-grade “tail” shows poor coherence above 6% (Figure 14.4) and a grade cap of 6% was applied to the lead composites.
Similarly, the gold histogram high-grade “tail” shows poor coherence above 10 g/t (Figure 14.5). A cap of 10 g/t was applied for gold.
NovaCopper Inc. | 14-13 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| The cap values were applied within both MS and to SMS mineralized zones. |
| |
| Figure 14.4Lead Histogram |
NovaCopper Inc. | 14-14 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.5 Gold Histogram
14.7.2 | COMPOSITE STATISTICS |
| The drill hole “capped” composite statistics by mineralization domain are shown in Table 14.15. |
| |
| Table 14.15Arctic Deposit Drill Hole Composite Statistics |
Mineralization Domain | Metal | Count | Minimum Grade | Maximum Grade | Mean Grade | Standard Deviation | Variance |
SMS
| Cu (%) | 641 | 0.00 | 16.35 | 2.75 | 2.44 | 5.94 |
Zn (%) | 633 | 0.01 | 20.80 | 3.45 | 3.76 | 14.14 |
Pb (%) | 623 | 0.00 | 5.15 | 0.62 | 0.75 | 0.57 |
Au (g/t) | 618 | 0.00 | 28.52 | 0.72 | 1.96 | 3.85 |
Ag (g/t) | 635 | 0.17 | 416.24 | 41.70 | 44.80 | 2,007.25 |
MS
| Cu (%) | 351 | 0.01 | 18.00 | 4.52 | 3.02 | 9.11 |
Zn (%) | 350 | 0.02 | 24.10 | 7.64 | 4.66 | 21.70 |
Pb (%) | 347 | 0.00 | 6.70 | 1.26 | 1.03 | 1.07 |
Au (g/t) | 340 | 0.00 | 8.06 | 0.88 | 0.80 | 0.64 |
Ag (g/t) | 349 | 0.17 | 501.00 | 76.40 | 54.86 | 3,009.34 |
NovaCopper Inc. | 14-15 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.8 | SPECIFIC GRAVITY ANALYSIS |
| |
14.8.1 | SPECIFIC GRAVITY STATISTICS AND SPATIAL ANALYSIS |
| The SG database for the Arctic Project contains 1,947 values, of which 878 are valid and in the resource area. Tetra Tech considers the data amenable for use in estimation of SG within most resource domains, due to the favourable spatial distribution of the samples. SG determination protocols and QA/QC review are discussed in detail in Section 11.0. |
| |
| NovaCopper provided a set of SG wireframes delineating volumes where the specific gravity was observed to be greater than 3.5 and barite alteration was recorded. Tetra Tech combined these SG domains with the MS domains to produce a “high-density” domain for use in SG estimation. Outside of the “high-density domain” and within the SMS domain, a “medium-density” domain was defined. Material located outside the SG and mineralization models is defined by the “low-density” domain. The three density domains correlate to SG values “>3.5”, “<3.5” and “waste” respectively. Summary statistics for these measurements are provided in Table 14.16. |
| |
| Table 14.16Arctic SG Determinations Summary Statistics |
Domain | SG | Count | Minimum (m) | Maximum (m) | Mean (m) | Standard Deviation | Variance |
High Density | > 3.5 | 128 | 2.83 | 4.64 | 3.80 | 0.48 | 0.23 |
Medium Density | < 3.5 | 54 | 2.72 | 4.26 | 3.06 | 0.37 | 0.14 |
Low Density | Waste | 696 | 1.47 | 4.30 | 2.80 | 0.20 | 0.04 |
Total | - | 878 | 1.47 | 4.64 | 2.96 | 0.44 | 0.19 |
14.8.2 | SPECIFIC GRAVITY INTERPOLATION PLAN |
| SG was estimated into the block model (cells 10 m by 10 m by 5 m) by ID2methodology. |
| |
| Results for density estimation are summarized in Table 14.17. |
| |
| Table 14.17Arctic Density Interpolation Summary Statistics |
SG Domain | Count | Minimum (m) | Maximum (m) | Mean (m) | Standard Deviation | Variance |
High Density | 6,417 | 2.68 | 4.58 | 3.42 | 0.49 | 0.24 |
Medium Density | 14,201 | 2.97 | 4.15 | 3.11 | 0.28 | 0.08 |
Low Density | 1,275,065 | 1.47 | 3.80 | 3.00 | 0.08 | 0.01 |
Total | 1,295,683 | 1.47 | 4.58 | 3.01 | 0.10 | 0.01 |
NovaCopper Inc. | 14-16 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.9 | ACID BASE ACCOUNTING ANALYSIS |
The current ABA database for the Arctic Project is limited to 148 samples (SRK 2010); however, some historical ABA sampling has been described by Kennecott. The 2010 program was designed to characterize waste based on an underground mine plan, thus current sampling is spatially concentrated around the semi-massive and massive sulphide lenses. Due to the limited spatial distribution of the ABA samples within the waste material, and based on a review of the ABA dataset, SRK recommended to use total sulphur percent as a proxy for acid potential (AP) and calcium percent as a proxy for neutralization potential (NP) to better characterize ABA in an open pit mine plan scenario. A total of 3,087 separate assay records totaling 6,073 m of samples within the resource area were tagged by lithogeochemical domain, and PAG/NAG ratios were determined for each domain based on the following steps:
| • | Acid Potential = 31.25 x Total S% |
| | |
| • | Neutralization Potential = Ca% was converted to Ca kg CaCO3/t via the equation (Ca%x1000/40) |
| | |
| • | Regression equations based on the Table 3 of the SRK July 2011 Preliminary ML/ARD Analysis, Ambler Project Arctic Deposit, Alaska Report were then used to calculate the PAG/NAG of each individual sample. ARD Classification criteria: |
| - | If AP is less than 8 kg CaCO3/t the sample is NAG regardless of NP/AP (this is equivalent to 0.25% S). |
| | |
| - | If AP is greater than 8 kg CaCO3/t, then NP/AP>3 defines NAG and NP/AP<3 defines PAG. |
PAG/NAG ratios were assigned to the block model based on the lithogeochemical and mineralization domains (Table 14.18).
Table 14.18 PAG and NAG Ratio Assignment for the ABA Domains
Wireframe | Description | Material Code | Ratio PAG | Ratio NAG |
U Plate 2013 | Undif. Upper Plate 50/50 split between MRP and Upper Felsite | 1 | 0.43 | 0.57 |
Fels1-Top 2013 | Felsite Top | 2 | 0.17 | 0.83 |
MRP-Upper 2013 | MRP Upper Limb | 3 | 0.55 | 0.45 |
Fels1_Upper 2013 | Felsite Upper Limb | 4 | 0.80 | 0.20 |
GS 2013 | Waste Grey Schist | 5 | 0.62 | 0.38 |
Fels1-fold core 2013 | Felsite Fold | 6 | 0.51 | 0.49 |
MRP-Lower 2013
| MRP Lower Limb – PAG/NAG Upper Limb ratios assumed | 7 | 0.55 | 0.45 |
If Material Code = 5 and Waste % < 100 then PAG | 8 | 1.00 | 0.00 |
NovaCopper Inc. | 14-17 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.10 | VARIOGRAPHY AND SPATIAL ANALYSIS |
Variography was modelled utilizing Isatis™ software. Variography (both downhole and spatial) was performed on composited drill hole data for semi-massive and massive sulphide domains. Representative variograms are shown in Figure 14.6 to Figure 14.9.
Table 14.19 shows variogram models for copper, zinc, lead, gold and silver within the two major semi-massive and massive domain types.
Table 14.19 Variogram Models
Domain | Metal | Nugget (Sill 0) | Sill 1 | Range 1 | Sill 2 | Range 2 |
SMS | Copper | 3.3 | 2.0 | 40; 40; 15 | 50; 50; 50 | 0.6 |
SMS | Zinc | 8.3 | 2.1 | 30 ;30; 10 | 67; 67; 45 | 2.5 |
SMS | Lead | 0.3 | 0.1 | 45; 45; 5 | - | - |
SMS | Gold | 2.4 | 1.71 | 30; 30; 5 | - | - |
SMS | Silver | 1,000 | 750 | 45; 45; 15 | - | - |
MS | Copper | 3.0 | 5.9 | 45; 45; 14 | - | - |
MS | Zinc | 8.0 | 13.2 | 45; 45; 16.5 | - | - |
MS | Lead | 0.35 | 0.22 | 30; 30; 10 | 0.67 | 70; 70; 26 |
MS | Gold | 0.33 | 0.2 | 45; 45; 20 | - | - |
MS | Silver | 900 | 800 | 30; 30; 12 | 250 | 75; 75; 45 |
Figure 14.6 Copper: Variography in SMS Domains
NovaCopper Inc. | 14-18 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.7 Zinc: Variography in SMS Domains
Figure 14.8 Copper: Variography in MS Domains
NovaCopper Inc. | 14-19 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.9 Zinc: Variography in MS Domains
14.11 | RESOURCE ESTIMATION METHODOLOGY |
Resource estimation was completed using Isatis™ (version 2012.1) software within an area encompassing all of the Arctic deposit with block model geometry and extents as presented in Table 14.20. As discussed in other sections, resource estimation methodology was based on the following:
| • | Assays were composited to 2 m and coded within each of 11 mineralization domains, and SG determinations were coded within each of the SG domains. |
| | |
| • | Composites were capped for extreme outlier grades. |
| | |
| • | During estimation, all of the estimation domains were treated as hard boundaries, preventing the sharing of composites across boundaries. |
| | |
| • | Copper, zinc, lead, gold and silver were estimated using OK methodology. |
| | |
| • | Whenever possible, SG was estimated using ID2methodology. All un-estimated blocks were assigned average SG values assessed separately for each domain. |
| | |
| • | NAG and PAG ratios were assigned to the block model based on lithogeochemical and mineralization domains. |
| | |
| • | Block model grades for the mineralized material portion of the block were calculated based on the proportion of MS and SMS within each block. |
NovaCopper Inc. | 14-20 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | Whole block model grades were calculated based on the weighted value of the estimated grade item based on the proportion of the mineralization domain (i.e. (%Cu_MS x %MS) + (%Cu_SMS x %SMS) + (%Cu_Waste x % Waste). Whole block model SG values were calculated based on the weighted value of the SG based on the proportion of the high-density, medium -density and waste domains within the block. Whole blocks, including internal dilution, were used in pit optimization. |
The selection of the search radii and rotations of search ellipsoids were guided by modelled ranges of continuity and were guided by modeled directions of continuity from variograms. In addition, the search radii parameters were established by conducting repeated test resource estimates and reviewing the results as a series of plan views and sections.
Hard estimation domain boundaries were applied to the model, which has the effect of constraining the data for estimation inside the narrow lenticular domain wireframes; therefore, effectively constraining the estimation without the need to apply extreme local anisotropy. Search distances were limited to a maximum of 300 m. The contribution to the estimates by data from distances further than twice the range of the variograms is very limited as the weighting placed on such samples is extremely low. Quantitative Kriging Neighbourhood Analysis (QKNA) was applied to optimize the search.
Variography was modeled separately for semi-massive and massive sulphide mineralization domains. In all cases, spherical variogram structures were applied. The orientation of the plane of greatest continuity (the flattening plane of the mineralized zones, variograms and search ellipsoid) was modelled on a plane striking at 80° and inclined at 15° to the south.
Search parameters were constrained within each mineralized domain and required an optimum number of 15 composites, minimum number of 5 composites, minimum number of 2 drillholes, and maximum search range of 200 m.
Table 14.20 Search Ellipse Orientation and Dimensions for Mineralization Domains
Domain | Min Samples per Estimate | Max Samples per Octant | Min Octants with Samples Octant | Max Search Perpendicular to Mineralization |
Discretization |
All | 15 | 15 | 200 | 50 | 5x5x3 |
The SG ID2 estimates were constructed in two steps. A flattened search ellipsoid with a range of 200 m in the mineralization plane and 40 m at right angles to the mineralization plane was applied with a minimum of 3 and maximum of 20 SG determinations required to estimate a block. The boundaries between the high-density, medium-density and waste domains were treated as hard boundaries as the change in SG across these boundaries is quite substantial. Final SG block values were calculated based on the estimated values and the weighted proportion of each domain in a block.
NovaCopper Inc. | 14-21 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.12 | RESOURCE BLOCK MODEL |
| |
14.12.1 | CONFIGURATION |
The block model is oriented with the model origin at the lower left hand corner (bottom southwest). All dimensions are in metres. The model is not rotated. Cell size and configuration was designed to facilitate best fit modelling of the narrow-vein geology of the Arctic mineralization. The block model configuration is recorded in Table 14.21. Proportions were used to define the portion of each block that lies below the topographic surface or inside the relevant mineralization model zones.
Categorical, calculated and deterministic variables for the cells of the block model are tabulated in Table 14.21. Categorical variables include domains (10, 11, 20, 21, 30, 31, 40, 41, 50, 51 and 60) and resource classifications (Measured, Indicated and Inferred). Deterministic variables include, but are not limited to, gold grade, indicator probability (zero to one), density, and Kriging variance.
NovaCopper Inc. | 14-22 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 14.21 Block Model Cell Attributes
Value | Description |
BM_10x10x5.csv X0,Y0,Z0 center of bottom leftmost block | - |
NX=30; X0= 612400.00m; DX=10.00m | - |
NY=105; Y0=7452600.00m; DY=10.00m | - |
NZ=180; Z0=350.00m; DZ=5.00m | - |
Xmin | 612395 |
Xmax | 613695 |
Ymin | 7452595 |
Ymax | 7453645 |
Zmin | 347.5 |
Zmax | 1247.5 |
Rotation: No rotation | - |
Variables | - |
SN, | Sequence number in block model |
X,Y,Z | Block centroid |
ID2_Ag,ID2_Au,ID2_Cu,ID2_Pb,ID2_Zn | ID2estimates for mineralized portions of each block |
OK_Ag,OK_Au,OK_Cu,OK_Pb,OK_Zn | OK estimates for mineralized portions of each block – USED IN RESOURCE STATEMENT |
Ore_percent | Percent of mineralized material in each 10x10x5 block |
ID2_SG | SG estimated by ID2 |
CLASS | Resource classification 0= nothing, 1= inferred, 2 = Indicated (provisional, as resource cut-off will be based on economic analysis) |
z_number | Orebody identifier, first digit 1=amb1, 2=amb2,5=amb5,6=amb5a; second digit, 0=semi- massive, 1=massive sulphide. This 21=amb2, massive sulphide portion |
ID Ag BLK,ID Au BLK,ID Cu BLK,ID Pb BLK,ID Zn BLK | ID2estimates for entire block (including waste and ore) |
OK Ag BLK,OK Au BLK,OK Cu BLK,OK Pb BLK,OK Zn BLK | OK estimates for entire block (including waste and ore) – USED IN GRADE SENSITIVITY ANALYSIS |
MM_nn_Xx | Number of samples used to estimate blocks (MM=method, Xx=element) |
MM_meandist_Xx | To estimating samples |
table continues…
NovaCopper Inc. | 14-23 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler | | |
Mining District, Northwest Alaska | | |
Value | Description |
Xx_sM semi-massive and XxMS Massive Sulphide estimates in overlap zones | - |
Prop_sM | Proportion of semi massive sulphide in mixed blocks |
Prop_MS | Proportion of massive sulphide in mixed blocks |
SG_1 | SG ID2estimates into (0) waste material (1) semi massive zones outside high specific gravity zones and (2) massive sulphide zones united with high SG zones |
SG_blk | SG ID2estimates adjusted for margins around MS and semi massive units – USED IN RESOURCE STATEMENT & GRADE SENSITIVITY ANALYSIS |
NovaCopper Inc. | 14-24 | 1251920100-REP-R0001-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler | | |
Mining District, Northwest Alaska | | |
The reported resource relies on the OK method as the best non-biased interpolator of grade. ID2 was employed for model validation purposes. The block model was validated using the following tools:
| • | Visual comparisons of drill hole composites with resource block grades. |
| • | Statistical comparisons between block and composite data. |
| • | Swath plot comparisons (drift analysis) comparing the OK model with the ID2 model. |
| • | Scatter plot comparisons of the OK estimates with the ID2estimates. |
| • | Grade and tonnage comparisons of the OK and ID2estimates over a range of cut-off grades. |
Figure 14.10 through Figure 14.14 shows representative west-east cross sections for the Arctic deposit, for copper, zinc, lead, gold and silver. Visual inspection of these sections conforms with observed drill hole data and interpreted geology.
Figure 14.10 Cross-section for Copper
NovaCopper Inc. | 14-25 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| The centre cores of the zones, contain MS concentrations where higher grade drill intercepts were obtained. The colour-coding in Figure 14.11 to Figure 14.14 shows higher estimated block grades in similar positions reflecting the zonation observed from the drill intercepts. |
| |
| Figure 14.11Cross-section for Zinc |
NovaCopper Inc. | 14-26 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.12 Cross-section for Lead
Figure 14.13 Cross-section for Gold
NovaCopper Inc. | 14-27 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Figure 14.14Cross-section for Silver |
14.13.2 | STATISTICAL COMPARISONS BETWEEN BLOCK AND COMPOSITE DATA |
SWATH PLOTS
Figure 14.15 through Figure 14.18 display representative swath plots for the Arctic Deposit block model OK and ID2 block estimates.
The algorithms used for OK and ID2 estimation are different, yet the similar grade patterns for both methods across the mineralized zones as shown in Figure 14.15 to Figure 14.18, demonstrates that the independent estimation methods provide similar outcomes which provides a degree of assurance for the estimation process.
NovaCopper Inc. | 14-28 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.15 Swath Plot of Block Copper Grade Values by Northing for the Arctic Deposit
Figure 14.16 Swath Plot of Block Copper Grade Values by Easting for the Arctic Deposit
NovaCopper Inc. | 14-29 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.17 Swath Plot of Block Zinc Grade Values by Northing for the Arctic Deposit
NovaCopper Inc. | 14-30 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.18 Swath Plot of Block Zinc Grade Values by Easting for the Arctic Deposit
SCATTER PLOTS
Figure 14.19 to Figure 14.23, show scatter plots comparing the OK estimates and the ID2 estimates within the mineralized domains. The regression coefficients and regression lines are shown on each graph with a better than 90% correlation between the two estimation methodologies. A 90% correlation is sufficient to validate the estimates.
NovaCopper Inc. | 14-31 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.19 Copper: Scatter Plot of OK versus ID Estimates
Figure 14.20 Zinc: Scatterplot of OK versus ID Estimates
NovaCopper Inc. | 14-32 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.21 Lead: Scatterplot of OK versus ID Estimates
Figure 14.22 Gold: Scatterplot of OK versus ID Estimates
NovaCopper Inc. | 14-33 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.23 Silver: Scatterplot of OK versus ID Estimates
GRADE AND TONNAGE COMPARISONS
Grade tonnage curves are graphs showing the progressive changes in tonnage and grade as the cut-off grade is increased for a particular mineralized deposit. These graphs provide a measure of the sensitivity of the mineralization in question to changes in cut-off grade which may be dictated by other factors such as mineral price and mining costs. The steeper the curve, the more sensitive is the grade or tonnage to changes in the cutoff grade. The graphs also provide a convenient measure of comparison between different estimation methodologies. The more different the shapes of the grade or tonnage curves, the more different the estimation of the blocks. Grade tonnage comparisons for OK and ID2 estimations are shown in Figure 14.24 to Figure 14.28 for the copper, zinc, lead, gold and silver respectively. In all five cases, the similarities in the graphs provide comfort that the block estimation methods have generated similar results. The marginally higher grade curves and marginally lower tonnage curves for the ID2 estimates, suggests that the ID2 estimation provides more weighting to the composites closer to the estimated blocks.
NovaCopper Inc. | 14-34 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.24 Block Model Grade Tonnage Comparison: Copper OK (red line) and Copper ID2 (broken line)
Figure 14.25 Block Model Grade Tonnage Comparison: Zinc OK (red line) and Zinc ID2 (broken line)
NovaCopper Inc. | 14-35 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 14.26 Block Model Grade Tonnage Comparison: Lead OK (red line) and Lead ID2 (broken line)
Figure 14.27 Block Model Grade Tonnage Comparison: Gold OK (red line) and Gold ID2 (broken line)
NovaCopper Inc. | 14-36 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Figure 14.28Block Model Grade Tonnage Comparison: Silver OK (red line) and Silver ID2(broken line) |
14.14 | MINERAL RESOURCE CLASSIFICATION |
Block model quantities and grade estimates for the Arctic Project were classified in accordance with the CIM Definition Standards for Mineral Resources and Mineral Reserves (adopted by the CIM Council on December 11, 2005) and incorporated by reference in NI 43-101 by Mike O’Brien, Pr.SciNat (SACNASP#400295/87).
A “Measured Mineral Resource” is that part of the total resource for which the physical characteristics are well established for use in production planning and economic evaluation; data is sufficient enough to confirm both geological and grade continuity. An “Indicated Mineral Resource” is that part of the total resource for which the physical characteristics are well established for use in production planning and economic evaluation; data is sufficient enough to reasonably assume, but cannot verify, geological and grade continuity. An “Inferred Mineral Resource” is that part of the total resource for which the quantity and grade can be estimated; data is sufficient enough to reasonably assume both geological and grade continuity.
Mineral resource classification is typically a subjective concept; industry best practices suggest that resource classification should consider, but not be limited to, drill and sample spacing, the deposit-type and mineralization continuity, surface and/or underground mineralization exposure, variography, kriging efficiency (KE), theoretical slope of regression (ZZ*) and/or prior mining experience. With respect to this resource classification, model cells are assigned classification on the basis of interpolation search and drill data density. Solid wireframes or strings were used to define the Inferred and Indicated resources.
NovaCopper Inc. | 14-37 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
14.14.1 | MEASURED RESOURCE CLASSIFICATION |
| |
| No resource is classified as Measured as the drill intercepts are rarely at shorter distances than the variograms ranges and the samples taken within the relatively narrow mineralized zones exhibit a relatively high nugget effect. |
| |
14.14.2 | INDICATED RESOURCE CLASSIFICATION |
| |
| Estimated blocks which have been interpolated within a distance of 75 m from at least two drill holes and within the modelled wireframes of the mineralized zones, are classified as Indicated. The observed geometric continuity of the higher grade zones which can be visually identified by the presence of sulphides provides additional comfort for the interpolation between drill holes. |
| |
14.14.3 | INFERRED RESOURCE CLASSIFICATION |
| |
| Estimated blocks which have been interpolated within a distance of 200 m from at least two drill holes and within the modeled wireframes of the mineralized zones, are classified as an Inferred Resource with the exception of the Indicated Resource. |
| |
14.15 | MINERAL RESOURCE ESTIMATE |
| |
| CIM Definition Standards for Mineral Resources and Mineral Reserves (November 2010) defines a mineral resource as: |
“(A) concentration or occurrence of diamonds, natural solid inorganic material, or natural solid fossilized organic material including base and precious metals, coal, and industrial minerals in or on the Earth’s crust in such a form and quantity and of such a grade or quality that it has reasonable prospects for economic extraction. The location, quantity, grade, geological characteristics and continuity of a Mineral Resource are known, estimated or interpreted from specific geological evidence and knowledge”.
The “reasonable prospects for economic extraction” requirement generally implies that the quantity and grade estimates meet certain economic thresholds and that the mineral resources are reported at appropriate cut-off grade taking into account extraction scenarios and processing recoveries. In order to meet this requirement, Tetra Tech considers that major portions of the Arctic Project are amenable for open pit extraction.
In order to determine the quantities of material offering “reasonable prospects for economic extraction” by an open pit, Tetra Tech used a pit optimizer and reasonable mining assumptions to evaluate the proportions of the block model (Indicated and Inferred blocks) that could be “reasonably expected” to be mined from an open pit.
The optimization parameters were selected based on experience and benchmarking against similar projects (Table 16.2 in Section 16.0). The reader is cautioned that the results from the pit optimization are used solely for the purpose of testing the “reasonable prospects for economic extraction” by an open pit and do not represent an attempt to estimate mineral reserves. The results are used as a guide to assist in the preparation of a mineral resource statement and to select an appropriate resource reporting cut-off grade.
NovaCopper Inc. | 14-38 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The pit optimization, economic, technical and operational parameters and as well as the metallurgical recoveries used for pit and mine schedule optimizations are provided in Table 16.1 and Table 16.2 in Section 16.0.
Table 14.22 Indicated Mineral Resource Table Restated by Mineralization Zone, Arctic Project, Alaska, Tetra Tech (July 30, 2013)
Indicated | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Blb) | Zn (Blb) | Pb (Blb) | Au (Moz) | Ag (Moz) |
amb1 | 8.053 | 2.53 | 3.04 | 0.49 | 0.68 | 50.3 | 450 | 540 | 87.1 | 0.18 | 13.0 |
amb2 | 0.930 | 3.20 | 7.17 | 1.30 | 0.77 | 68.3 | 66 | 147 | 26.7 | 0.02 | 2.0 |
amb3 | 5.955 | 3.21 | 3.82 | 0.64 | 0.42 | 38.1 | 449 | 501 | 84.4 | 0.08 | 7.3 |
amb4 | 1.393 | 4.42 | 9.12 | 1.58 | 0.79 | 89.8 | 136 | 280 | 48.6 | 0.04 | 4.0 |
amb5 | 7.517 | 3.70 | 5.25 | 0.93 | 0.95 | 59.5 | 613 | 870 | 153.9 | 0.23 | 14.4 |
Total | 23.848 | 3.26 | 4.45 | 0.76 | 0.71 | 53.2 | 1,713 | 2,338 | 400.9 | 0.55 | 40.8 |
Table 14.23 Inferred Mineral Resource Table Restated by Mineralization Zone, Arctic Project, Alaska, Tetra Tech (July 30, 2013)
Inferred | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Blb) | Zn (Blb) | Pb (Blb) | Au (Moz) | Ag (Moz) |
amb1 | 1.120 | 3.07 | 4.25 | 0.69 | 0.85 | 57.2 | 76 | 105 | 17.1 | 0.03 | 2.1 |
amb2 | 0.038 | 3.19 | 5.50 | 0.92 | 1.06 | 66.4 | 3 | 5 | 0.8 | 0.00 | 0.1 |
amb3 | 1.354 | 3.18 | 3.27 | 0.41 | 0.31 | 27.5 | 95 | 98 | 12.4 | 0.01 | 1.2 |
amb4 | 0.000 | 0.00 | 0.00 | 0.00 | 0.00 | 0.0 | 0 | 0 | 0.0 | 0.00 | 0.0 |
amb5 | 0.851 | 3.48 | 4.03 | 0.67 | 0.68 | 41.7 | 65 | 76 | 12.6 | 0.02 | 1.1 |
Total | 3.363 | 3.22 | 3.84 | 0.58 | 0.59 | 41.5 | 239 | 285 | 43.2 | 0.06 | 4.5 |
The following notes apply to Table 14.22 and Table 14.23:
| 1. | These resource estimates have been prepared in accordance with NI 43-101 and the CIM Definition Standards. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Inferred resources have a great amount of uncertainty as to their existence and whether they can be mined legally or economically. It cannot be assumed that all or any part of the Inferred resources will ever be upgraded to a higher category. |
| | |
| 2. | Mineral Resources are reported within mineralization wireframes, contained within an Indicated and Inferred pit design using an assumed copper price of $2.90/lb, zinc price of $0.85/lb, lead price of $0.90/lb, silver price of $22.70/oz, and gold price of $1,300/oz. |
| | |
| 3. | Appropriate mining costs, processing costs, metal recoveries and inter ramp pit slope angles were used to generate the pit design. |
| | |
| 4. | The $35.01/t milled cut-off is calculated based on a process operating cost of $19.03/t, G&A of $7.22/t and site services of $8.76/t. NSR equals payable metal values, based on the metal prices outlined in Note 2 above, less applicable treatment, smelting, refining costs, penalties, concentrate transportation costs, insurance and losses and royalties. |
| | |
| 5. | The LOM strip ratio is 8.39. |
| | |
| 6. | Rounding as required by reporting guidelines may result in apparent summation differences between tonnes, grade and contained metal content. |
| | |
| 7. | Tonnage and grade measurements are in metric units. Contained copper, zinc and lead pounds are reported as imperial pounds, contained silver and gold ounces as troy ounces. |
NovaCopper Inc. | 14-39 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
14.16 | GRADE SENSITIVITY ANALYSIS |
The mineral resources of the Arctic Project are sensitive to the selection of the mining methodology. To illustrate this sensitivity, the global block model quantities and grade estimates within the mineralization domains and within the whole blocks (including internal dilution within a mineable block size of 10 m by 10 m by 5 m) are presented in Table 14.24 for Indicated resources and in Table 14.25 for Inferred resources, at an $35/t NSR cut-off value. The reader is cautioned that the values presented in these tables should not be misconstrued with a Mineral Resource Statement. The tables are only presented to show the sensitivity of the block model estimates to the mining block internal dilution.
Table 14.24 Material Comprising the Indicated Mineral Resource (Table 14.22) Diluted to Full Blocks, Restated by Mineralization Zone, Arctic Project, Alaska
Indicated | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Blb) | Zn (Blb) | Pb (Blb) | Au (Moz) | Ag (Moz) |
Mineralized Only | 23.848 | 3.26 | 4.45 | 0.76 | 0.71 | 53.2 | 1,713 | 2,338 | 400.9 | 0.55 | 40.8 |
With Internal Block Dilution | 32.808 | 2.37 | 3.23 | 0.55 | 0.52 | 38.7 | 1,713 | 2,338 | 400.9 | 0.55 | 40.8 |
Note: Based on a cut-off calculated from NSR plus infrastructure cost of $35/mineralized tonne. Details are shown in Section 16.0.
Table 14.25 Material Comprising the Inferred Mineral Resource (Table 14.23) Diluted to Full Blocks, Restated by Mineralization Zone, Arctic Project, Alaska
Inferred | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Blb) | Zn (Blb) | Pb (Blb) | Au (Moz) | Ag (Moz) |
Mineralized Only | 3.363 | 3.22 | 3.84 | 0.58 | 0.59 | 41.5 | 239 | 285 | 43.2 | 0.06 | 4.5 |
With Internal Block Dilution | 5.102 | 2.12 | 2.53 | 0.38 | 0.39 | 27.3 | 239 | 285 | 43.2 | 0.06 | 4.5 |
Note: Based on a cut-off calculated from NSR plus infrastructure cost of $35/mineralized tonne. Details are shown in Section 16.0.
The sensitivity of the mineral resources of the Arctic Project to the economic cut-off is represented by selecting material above different NSR values. The global block model quantities and grade estimates within the mineralization domains and within the whole blocks (including internal dilution within a mineable block size of 10 m by 10 m by 5 m) are presented in Table 14.26 for Indicated resources and in Table 14.27 for Inferred resources, at an $35/t (the current base case) and at elevated $40/t and $45/t NSR cut-off values. The reader is cautioned that the values presented in these tables should not be misconstrued with a Mineral Resource Statement. The tables are only presented to show the economic sensitivity of the block model estimates.
NovaCopper Inc. | 14-40 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 14.26 Indicated Mineral Resource Table Sensitivity to NSR Within Whole Blocks
Indicated | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Au (koz) | Ag (Moz) |
NSR 35 | 32.808 | 2.37 | 3.23 | 0.55 | 0.52 | 38.7 | 1,713 | 2,338 | 400.9 | 5.5 | 40.8 |
NSR 40 | 31.937 | 2.37 | 3.30 | 0.57 | 0.53 | 39.4 | 1,667 | 2,324 | 398.5 | 5.4 | 40.5 |
NSR 45 | 31.074 | 2.42 | 3.36 | 0.58 | 0.54 | 40.2 | 1,658 | 2,302 | 397.3 | 5.4 | 40.1 |
Table 14.27 Inferred Mineral Resource Table Sensitivity to NSR, Arctic Project Within Whole Blocks
Inferred | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Au (koz) | Ag (Moz) |
NSR 35 | 5.102 | 2.12 | 2.53 | 0.38 | 0.39 | 27.3 | 239 | 285 | 43.2 | 0.6 | 4.5 |
NSR 40 | 4.918 | 2.17 | 2.58 | 0.39 | 0.40 | 28.0 | 235 | 280 | 42.3 | 0.6 | 4.4 |
NSR 45 | 4.724 | 2.23 | 2.64 | 0.40 | 0.41 | 28.7 | 232 | 275 | 41.7 | 0.6 | 4.4 |
NovaCopper Inc. | 14-41 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
15.0 | MINERALRESERVEESTIMATES |
In this technical report, the terms “mineral reserve”, “probable mineral reserve” and “proven mineral reserve” have the meanings ascribed to those terms by the CIM, as the CIM Definition Standards on Mineral Resources and Mineral Reserves adopted by CIM Council, as amended.
A “mineral reserve” has not been estimated for the Arctic Project as part of this PEA.
NovaCopper Inc. | 15-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
16.1 | INTRODUCTION |
| |
| Tetra Tech has prepared an open pit mining study to support development of an updated PEA for the Arctic Project. This section outlines the input data, procedures and results of this PEA-level open pit optimization, design, mine production scheduling and associated costing. |
| |
16.2 | PIT OPTIMIZATION |
| |
| Tetra Tech performed the open pit optimizations using Gemcom Whittle™software, which is based on the Lerchs -Grossmann (LG) optimization algorithm. Pit optimization parameters were prepared from first principle estimates, technical studies and experience from other projects. |
| |
16.2.1 | BLOCK MODEL |
| |
| Mineral Resources for the Arctic Project were prepared by Tetra Tech. This work is documented in Section 14.0, and forms the basis of the open pit optimizations. A block model was provided to the mining team as a MineSight™file with 10 m by 10 m by 5 m blocks. |
| |
16.2.2 | PIT SLOPE ANGLE |
| |
| An overall pit slope angle of 43° was used in the open pit optimizations. This pit slope angle is based on limited available geotechnical data, conservative estimates from previous experience and widely accepted empirical evidence (EBA 2013). |
| |
16.2.3 | SURFACE TOPOGRAPHY |
| |
| NovaCopper provided digital topographical drawings to Tetra Tech in NAD 83 for the Arctic Project area from 2010. The topography can be seen in Figure 16.1. |
| |
16.2.4 | PIT OPTIMIZATION PARAMETERS |
| |
| The economic, technical and operational parameters as well as the metallurgical recoveries used for pit and mine schedule optimizations are provided in Table 16.1 and Table 16.2. |
NovaCopper Inc. | 16-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 16.1 Arctic Project Topography
NovaCopper Inc. | 16-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Table 16.1 Pit Optimization Parameters
Item | Units | Value | Cu Concentrate | Pb Concentrate | Zn Concentrate |
Production Rate | Mineralized material processed | t/day | 10,000 | - | - | - |
Metal Prices
| Gold | $/oz | 1,300.00 | - | - | - |
Copper | $/lb | 2.90 | - | - | - |
Silver | $/oz | 22.70 | - | - | - |
Lead | $/lb | 0.90 | - | - | - |
Zinc | $/lb | 0.85 | - | - | - |
Royalty | - | % of NSR | 1.0 | - | - | - |
Concentrate
| Concentrate grade | % Cu/Pb/Zn | - | 29.0 | 50.0 | 56.0 |
Gold in concentrate | g/t | - | Variable | Variable | Variable |
Silver in concentrate | g/t | - | Variable | Variable | Variable |
Moisture content | % | - | 9.0 | 9.0 | 9.0 |
Concentrate Transportation
| Trucking | $/wmt | - | 66.96 | 66.96 | 66.96 |
Port | $/wmt | - | 20.00 | 20.00 | 20.00 |
Ocean freight | $/wmt | - | 63.00 | 63.00 | 63.00 |
Total | $/wmt | - | 149.96 | 149.96 | 149.96 |
Smelter Deductions
| Concentrate unit deduction | Units of concentrate grade (%) | - | 1.00 | 3.00 | 8.50 |
Gold, deductions | % | - | 5.00 | 5.00 | No payment |
Silver, deductions | % | - | 10.00 | 10.00 | No payment |
Penalties
| Element 1 – Arsenic | $/dmt | - | - | 4.46 | - |
Element 2 – Antimony | $/dmt | - | - | 1.50 | - |
Element 3 – Mercury | $/dmt | - | 0.01 | - | - |
Element 4 – Lead | $/dmt | - | 0.45 | - | - |
Element 5 – Zinc | $/dmt | - | 1.95 | - | - |
Total | $/dmt | - | 2.41 | 5.96 | 0.00 |
table continues…
NovaCopper Inc. | 16-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Item | Units | Value | Cu Concentrate | Pb Concentrate | Zn Concentrate |
Others
| Concentrate losses (during transport and rehandling) | % | - | 0.42 | 0.42 | 0.42 |
Insurance | % NIV | - | 0.15 | 0.15 | 0.15 |
Representation/marketing | $/wmt | - | 2.50 | 2.50 | 2.50 |
Smelting/Refining Terms
| Smelting | $/dmt | - | 70.00 | 180.00 | 300.00 |
Refining | | - | - | - | - |
- copper | $/lb | - | 0.07 | - | - |
- gold | $/oz | - | 10.00 | 10.00 | 10.00 |
- silver | $/oz | - | 0.60 | 0.60 | 0.60 |
- lead | $/lb | - | - | - | - |
- zinc | $/lb | - | - | - | - |
Operating Cost
| Mining (mineralized material or waste) | $/t mined | 3.00 | - | - | - |
Added haul cost/bench | $/t mined | 0.02 | - | - | - |
Processing | $/t milled | 19.03 | - | - | - |
Surface services | $/t milled | 8.76 | - | - | - |
G&A | $/t milled | 7.22 | - | - | - |
Block Model | Size | m | 10 by 10 by 5 | - | - | - |
Density
| Mineralized material and waste rock | t/m3 | Variable | - | - | - |
Default SG (mineralized material) | t/m3 | 3.40 | - | - | - |
Default SG (waste) | t/m3 | 2.80 | - | - | - |
Mining Dilution | - | % | 5 | - | - | - |
Mining Recovery | - | % | 95 | - | - | - |
Pit Slope Angle | - | degrees | 43 | - | - | - |
NovaCopper Inc. | 16-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Table 16.2 Metallurgical Recovery
Head Grade | Recovery |
Head, % Cu | Recovery, % Cu |
>5.0 | 92.00 |
2.0-5.0 | 4.1209 x ln(head grade) + 83.652 |
0.5-2.0 | -3.6363 x (head grade)2 + 16.08 x (head grade) + 68.792 |
0.3-0.5 | 50.00 |
0.1-0.3 | 20.00 |
<0.1 | 0.00 |
Head, % Pb | Recovery, % Pb |
>2.0 | 85.00 |
0.5-2.0 | 3.7128 x ln(head grade) + 76.499 |
0.3-0.5 | 8.0157 x ln(head grade) + 79.365 |
0.2-0.3 | 50.00 |
<0.2 | 0.00 |
Head, % Zn | Recovery, % Zn |
>7.0 | 92.00 |
3.0-7.0 | 5.159 x ln(head grade) + 81.06 |
1.5-3.0 | 8.940 x ln(head grade) + 76.80 |
1.0-1.5 | 75.00 |
0.5-1.0 | 50.00 |
<0.5 | 0.00 |
Head, g/t Ag | Recovery, % Ag |
>100.0 | 88.00 |
40.0-100.0 | 6.102 x ln(head grade) + 58.8 |
20.0-40.0 | -0.012 x (head grade)2 + 1.197 x (head grade) + 52.54 |
10.0-20.0 | 50.00 |
5.0-10.0 | 25.00 |
<5.0 | 0.00 |
Head, g/t Au | Recovery, % Au |
>1.5 | 85.00 |
0.51-1.5 | 12.303 x ln(head grade) + 74.072 |
0.1-0.51 | 26.003 x ln(head grade) + 83.069 |
<0.1 | 0.00 |
16.2.5 | PIT OPTIMIZATION RESULTS |
Using the pit optimization parameters in Table 16.1 and the process recoveries in Table 16.2, 49 pit shells were generated using Gemcom Whittle™software, corresponding to price factors ranging between 0.292 and 1.2. Optimizations were run using Indicated and Inferred mineral resources. The discounted value of each pit was estimated using a discount rate of 8%. All operating costs and smelting/refining terms in Table 16.1 were considered in the discounted values. No capital costs were considered in generating these values. The pit optimization results are summarized in Table 16.3. Based on the discounted value, pit 27 was selected to be the final pit. This pit corresponds to a price factor of 0.76.
NovaCopper Inc. | 16-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 16.3 Pit Optimization Results
Pit |
Price Factor | Discounted Value ($000) | Total Tonnes Mined (t) | Mineralized Material Mined (t) | Cu Grade (%) | Pb Grade (%) | Zn Grade (%) | Au Grade (g/t) | Ag Grade (g/t) |
1 | 0.292 | 1,241,029 | 91,506,034 | 11,073,401 | 2.75 | 0.68 | 4.02 | 0.53 | 42.38 |
2 | 0.300 | 1,354,602 | 99,811,925 | 12,347,334 | 2.70 | 0.69 | 4.04 | 0.54 | 41.97 |
3 | 0.320 | 1,587,243 | 118,832,054 | 15,646,729 | 2.59 | 0.65 | 3.82 | 0.55 | 41.36 |
4 | 0.340 | 1,644,715 | 123,679,698 | 16,726,285 | 2.55 | 0.64 | 3.74 | 0.54 | 40.77 |
5 | 0.360 | 1,716,797 | 131,398,298 | 18,199,897 | 2.50 | 0.62 | 3.66 | 0.53 | 40.05 |
6 | 0.380 | 1,752,065 | 135,449,322 | 18,952,025 | 2.48 | 0.62 | 3.61 | 0.53 | 39.71 |
7 | 0.400 | 2,042,751 | 181,898,688 | 24,958,036 | 2.39 | 0.58 | 3.41 | 0.51 | 38.07 |
8 | 0.420 | 2,137,932 | 200,210,781 | 27,287,278 | 2.36 | 0.57 | 3.36 | 0.50 | 37.65 |
9 | 0.440 | 2,202,656 | 217,809,344 | 28,987,367 | 2.35 | 0.56 | 3.32 | 0.50 | 37.47 |
10 | 0.460 | 2,223,852 | 223,877,773 | 29,639,952 | 2.34 | 0.56 | 3.30 | 0.50 | 37.33 |
11 | 0.480 | 2,253,074 | 232,939,309 | 30,526,639 | 2.34 | 0.55 | 3.27 | 0.50 | 37.15 |
12 | 0.500 | 2,269,410 | 238,625,192 | 31,067,030 | 2.33 | 0.55 | 3.26 | 0.50 | 37.04 |
13 | 0.520 | 2,283,094 | 244,218,775 | 31,660,921 | 2.32 | 0.55 | 3.24 | 0.50 | 36.90 |
14 | 0.540 | 2,287,084 | 245,881,130 | 31,896,102 | 2.32 | 0.55 | 3.23 | 0.49 | 36.82 |
15 | 0.560 | 2,297,763 | 251,390,824 | 32,459,969 | 2.31 | 0.54 | 3.20 | 0.49 | 36.67 |
16 | 0.580 | 2,302,132 | 254,173,635 | 32,767,578 | 2.30 | 0.54 | 3.19 | 0.49 | 36.57 |
17 | 0.591 | 2,305,059 | 256,019,634 | 32,958,694 | 2.30 | 0.54 | 3.18 | 0.49 | 36.52 |
18 | 0.592 | 2,348,788 | 282,491,248 | 34,885,340 | 2.26 | 0.54 | 3.16 | 0.49 | 36.47 |
19 | 0.600 | 2,352,851 | 285,511,537 | 35,149,503 | 2.26 | 0.54 | 3.15 | 0.49 | 36.42 |
20 | 0.620 | 2,356,262 | 288,574,043 | 35,554,707 | 2.25 | 0.53 | 3.14 | 0.49 | 36.29 |
21 | 0.640 | 2,359,157 | 291,915,359 | 35,936,186 | 2.24 | 0.53 | 3.12 | 0.49 | 36.17 |
22 | 0.660 | 2,365,531 | 299,599,350 | 36,452,825 | 2.24 | 0.53 | 3.11 | 0.49 | 36.11 |
23 | 0.680 | 2,367,999 | 302,094,218 | 36,675,567 | 2.23 | 0.53 | 3.10 | 0.49 | 36.06 |
24 | 0.700 | 2,369,087 | 303,522,442 | 36,836,105 | 2.23 | 0.53 | 3.09 | 0.49 | 36.00 |
25 | 0.720 | 2,373,382 | 310,689,985 | 37,311,249 | 2.22 | 0.52 | 3.08 | 0.49 | 35.91 |
26 | 0.740 | 2,374,653 | 314,359,773 | 37,619,157 | 2.22 | 0.52 | 3.06 | 0.49 | 35.83 |
27 | 0.760 | 2,377,134 | 321,537,575 | 38,015,718 | 2.21 | 0.52 | 3.05 | 0.49 | 35.78 |
28 | 0.780 | 2,377,092 | 322,246,524 | 38,153,413 | 2.21 | 0.52 | 3.05 | 0.48 | 35.73 |
29 | 0.800 | 2,376,939 | 324,893,126 | 38,353,791 | 2.20 | 0.52 | 3.04 | 0.48 | 35.69 |
30 | 0.820 | 2,376,783 | 325,186,003 | 38,421,686 | 2.20 | 0.52 | 3.03 | 0.48 | 35.65 |
31 | 0.840 | 2,376,499 | 329,107,590 | 38,614,089 | 2.20 | 0.52 | 3.03 | 0.48 | 35.61 |
32 | 0.860 | 2,375,843 | 332,799,860 | 38,847,858 | 2.20 | 0.51 | 3.02 | 0.48 | 35.55 |
33 | 0.880 | 2,375,457 | 333,844,770 | 38,925,548 | 2.19 | 0.51 | 3.01 | 0.48 | 35.53 |
34 | 0.900 | 2,374,381 | 337,373,626 | 39,168,160 | 2.19 | 0.51 | 3.01 | 0.48 | 35.46 |
35 | 0.920 | 2,373,503 | 338,709,274 | 39,276,488 | 2.19 | 0.51 | 3.00 | 0.48 | 35.42 |
36 | 0.940 | 2,373,079 | 339,144,938 | 39,346,029 | 2.18 | 0.51 | 3.00 | 0.48 | 35.39 |
table continues…
NovaCopper Inc. | 16-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
Pit |
Price Factor | Discounted Value ($000) | Total Tonnes Mined (t) | Mineralized Material Mined (t) | Cu Grade (%) | Pb Grade (%) | Zn Grade (%) | Au Grade (g/t) | Ag Grade (g/t) |
37 | 0.960 | 2,372,004 | 342,213,188 | 39,546,123 | 2.18 | 0.51 | 2.99 | 0.48 | 35.34 |
38 | 0.980 | 2,371,592 | 342,927,941 | 39,615,040 | 2.18 | 0.51 | 2.99 | 0.48 | 35.31 |
39 | 1.000 | 2,370,194 | 344,840,391 | 39,751,273 | 2.17 | 0.51 | 2.98 | 0.48 | 35.27 |
40 | 1.020 | 2,369,568 | 345,313,884 | 39,805,458 | 2.17 | 0.51 | 2.98 | 0.48 | 35.25 |
41 | 1.040 | 2,368,753 | 346,263,522 | 39,891,956 | 2.17 | 0.51 | 2.98 | 0.48 | 35.21 |
42 | 1.060 | 2,367,822 | 347,119,812 | 39,981,247 | 2.17 | 0.51 | 2.97 | 0.48 | 35.17 |
43 | 1.080 | 2,365,527 | 351,324,684 | 40,151,750 | 2.16 | 0.51 | 2.97 | 0.48 | 35.15 |
44 | 1.100 | 2,364,682 | 352,623,409 | 40,206,627 | 2.16 | 0.51 | 2.97 | 0.48 | 35.13 |
45 | 1.120 | 2,363,807 | 354,571,214 | 40,320,322 | 2.16 | 0.51 | 2.96 | 0.48 | 35.10 |
46 | 1.140 | 2,362,792 | 356,748,523 | 40,408,292 | 2.16 | 0.51 | 2.96 | 0.48 | 35.07 |
47 | 1.160 | 2,362,653 | 356,972,620 | 40,419,045 | 2.16 | 0.51 | 2.96 | 0.48 | 35.07 |
48 | 1.180 | 2,362,343 | 357,476,805 | 40,443,693 | 2.16 | 0.51 | 2.96 | 0.48 | 35.06 |
49 | 1.200 | 2,361,902 | 358,442,346 | 40,464,900 | 2.16 | 0.51 | 2.96 | 0.48 | 35.06 |
16.3 | MINE DESIGN |
| |
16.3.1 | BENCH HEIGHT AND PIT WALL SLOPE |
Limited geotechnical data is available for the Arctic Project. Current open pit design is based on the recommendations by EBA (2013). The pit design incorporates a bench height of 5 m and a 45° inter-ramp angle. After adding the ramps, the overall slope angle will be within 43°, as recommended by EBA (2013). Pit excavation will be triple benched as shown in Figure 16.2.
Figure 16.2 Pit Wall Slope
NovaCopper Inc. | 16-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
16.3.2 | MINIMUM WORKING AREA |
Benches have been designed to accommodate an 11.0 m3 diesel hydraulic shovel and a 90 t truck. At the pit bottom, there are areas where mining will be reduced to 40 m width. Tetra Tech recommends the use of a front-end loader and 43.5 t articulated trucks for such areas where available space restricts production.
Main haul roads for the project were designed to accommodate 90 t haul trucks with two-way traffic and one-way traffic for the three lowest benches of the pit. Haul road design details can be seen in Table 16.4, Figure 16.3 and Figure 16.4. Ramps are designed with a maximum grade of 10%.
Table 16.4 Haul Road Width
Haul Road Width |
Traffic | One-way (m) | Two way (m) |
Running Surface | 13.0 | 22.7 |
Safety Berm | 5.3 | 5.3 |
Ditch | 2.0 | 2.0 |
Total | 20.3 | 30.0 |
Figure 16.3 One-way Haul Road
NovaCopper Inc. | 16-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 16.4 Two-way Haul Road
16.3.4 | PIT HYDROLOGY/DEWATERING |
No pit hydrology/dewatering were included in this PEA study. However, an allowance is included in the mining operating cost to account for pit dewatering.
After applying the design criteria, the final pit includes 35.7 Mt of mineral resource with a LOM strip ratio of 8.39. A material summary from the final pit can be seen in Table 16.5. Figure 16.5 shows a general view of the final pit.
Table 16.5 Pit Design Results
Material | Mass (Mt) | Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) |
Mineralized Material | 35.7 | 2.2792 | 0.5306 | 3.1259 | 0.4978 | 36.9145 |
Waste – NAG | 134.6 | - | - | - | - | - |
Waste – PAG | 164.8 | - | - | - | - | - |
NovaCopper Inc. | 16-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 16.5 Pit Design
NovaCopper Inc. | 16-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
The mining schedule was developed based on a maximum mill capacity of 10,000 t/d. The Arctic Project’s total mine life is 13 years, including 1 year of pre-stripping followed by 12 years of production. The pit uses four pushbacks and a minimum mining width of 40 m. As shown in Table 16.6, over the 13-year life, the pit is producing 35.7 Mt of mineralized material and 299.4 Mt of waste rock. The LOM stripping ratio is 8.39 and the stripping ratio excluding the pre-stripping waste rock is 7.94. The mining schedule does not currently consider a low-grade stockpiling option but this can be assessed in more detail in future studies. The cut-off grade was optimized to maximize the discounted value of the Arctic Project. Due to operational and geometric constraints, the mine will require a ramp-up period of three years before achieving full mill capacity. Figure 16.6 shows the production schedule indicating the total mined waste and total mined mineralized material fed to the process plant. Figure 16.7 through Figure 16.10 show the status of mining activity at the end of the pre-production year (-1) and years 4, 8, and 12 (end of mine life).
NovaCopper Inc. | 16-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 16. 6 | Production Schedule |
Year | Mineralized Material Processed (t) | Waste Production (t) | Strip Ratio | Total Material Mined (t) | Head Grades |
Inferred | Indicated | Total | PAG | NAG | Total | Cu (%) | Pb (%) | Zn (%) | Au (g/t) | Ag (g/t) |
-1 | 0 | 0 | 0 | 7,187,581 | 8,812,419 | 16,000,000 | - | 16,000,000 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
1 | 352,156 | 648,937 | 1,001,092 | 16,228,292 | 14,770,616 | 30,998,908 | 30.97 | 32,000,000 | 2.42 | 0.41 | 2.71 | 0.45 | 28.53 |
2 | 32,439 | 1,905,170 | 1,937,609 | 15,775,430 | 14,286,961 | 30,062,391 | 15.52 | 32,000,000 | 2.38 | 0.41 | 2.86 | 0.36 | 35.49 |
3 | 25,245 | 2,682,237 | 2,707,483 | 15,579,203 | 13,713,314 | 29,292,517 | 10.82 | 32,000,000 | 2.14 | 0.54 | 3.13 | 0.46 | 34.94 |
4 | 31,759 | 3,188,537 | 3,220,296 | 15,312,509 | 13,467,195 | 28,779,704 | 8.94 | 32,000,000 | 2.15 | 0.61 | 3.57 | 0.46 | 34.32 |
5 | 22,219 | 3,627,781 | 3,650,000 | 16,034,444 | 12,307,138 | 28,341,582 | 7.76 | 31,991,582 | 2.58 | 0.69 | 3.97 | 0.57 | 41.43 |
6 | 110,237 | 3,539,763 | 3,650,000 | 12,660,879 | 9,307,401 | 21,968,279 | 6.02 | 25,618,279 | 2.46 | 0.52 | 2.94 | 0.57 | 39.79 |
7 | 298,623 | 3,351,377 | 3,650,000 | 12,660,879 | 9,307,401 | 21,968,279 | 6.02 | 25,618,279 | 2.44 | 0.55 | 3.36 | 0.50 | 39.39 |
8 | 724,295 | 2,507,152 | 3,231,448 | 12,660,879 | 9,307,401 | 21,968,279 | 6.8 | 25,199,727 | 2.38 | 0.58 | 3.42 | 0.45 | 37.97 |
9 | 784,841 | 2,579,931 | 3,364,772 | 12,660,879 | 9,307,401 | 21,968,279 | 6.53 | 25,333,051 | 2.05 | 0.41 | 2.57 | 0.43 | 30.41 |
10 | 493,525 | 3,156,475 | 3,650,000 | 12,660,879 | 9,307,401 | 21,968,279 | 6.02 | 25,618,279 | 2.38 | 0.51 | 3.20 | 0.50 | 38.43 |
11 | 1,048,358 | 2,601,642 | 3,650,000 | 12,660,879 | 9,307,401 | 21,968,279 | 6.02 | 25,618,279 | 1.90 | 0.49 | 2.61 | 0.55 | 35.35 |
12 | 687,886 | 1,280,633 | 1,968,519 | 2,704,145 | 1,365,556 | 4,069,701 | 2.07 | 6,038,220 | 2.07 | 0.49 | 2.53 | 0.60 | 40.73 |
Total | 4,611,583 | 31,069,635 | 35,681,219 | 164,786,875 | 134,567,602 | 299,354,477 | 8.39 | 335,035,696 | 2.28 | 0.53 | 3.13 | 0.50 | 36.91 |
NovaCopper Inc. | 16-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 16. 6 | Production Schedule |
NovaCopper Inc. | 16-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 16.7 Pre-production Year Mine Status Map
NovaCopper Inc. | 16-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 16.8 Year 4 Mine Status Map
NovaCopper Inc. | 16-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 16.9 Year 8 Mine Status Map
NovaCopper Inc. | 16-16 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
Figure 16.10 Year 12 Mine Status Map
NovaCopper Inc. | 16-17 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
16.5 | MINE WASTE ROCK MANAGEMENT |
Over the LOM, the pit produces 134.6 Mt of NAG waste rock and 164.8 Mt of PAG waste rock to a total of 299.4 Mt of waste rock. A total of 67.6 Mt of the NAG material will be utilized in building and raising the tailing dam and the remaining 67 Mt of NAG material will be disposed in the waste dump located at the west of the pit. The 164.8 Mt PAG material will be hauled and buried in the tailings facility.
16.6 | MINING EQUIPMENT |
| |
16.6.1 | MINE EQUIPMENT FLEET |
| |
| Mining equipment selection was based on the material movement schedule, geometry of the open pit, and integration with the rest of the fleet. |
| |
16.6.2 | OPERATING HOURS |
Mining will operate 365 d/a with 2 shifts per day and 12 hours per shift for the duration of the Arctic Project. The anticipated delays per shift are shown in Table 16.7. Based on these delays, the overall availability of mining is 18.3 hours per day.
Table 16.7 Operational Delays per Shift
Delay | Time (min) |
Weather | 34 |
Breaks | 60 |
Shift Change | 15 |
Blasting | 30 |
Communication | 2 |
Training | 1 |
Fuel, Equipment Moves, Other | 30 |
Total | 172 |
Primary equipment was selected to match scheduled mine operations. Four 11.0 m3 diesel hydraulic shovels and twenty-four 90 t trucks were selected as the primary loading and haulage equipment. Haul truck cycle times were estimated using Caterpillar Fleet Production and Cost software, estimated travel times can be seen in Table 16.8.
Blasthole drilling will be performed using up to seven diesel rotary drills as primary drilling equipment. Secondary drilling will be performed using a percussion drill. Blasting will be performed using ammonium nitrate/fuel oil (ANFO) and emulsion with mix proportions of 0.85 and 0.15, respectively.
NovaCopper Inc. | 16-18 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Primary equipment requirements for the LOM are listed in Table 16.9.
Table 16.8 Haulage Cycle Times
Cycle Time (min) |
Destination | Year -1 | Year 1 to 4 | Year 5 to 8 | Year 9 to 12 |
Crusher | 15.18 | 12.47 | 11.64 | 13.09 |
NAG Dump | 22.23 | 21.89 | 23.82 | 25.75 |
Dam | 32.46 | 28.35 | 24.20 | 28.33 |
PAG Dump | 30.92 | 23.80 | 17.02 | 10.46 |
Table 16.9 Primary Equipment Requirements
| Year |
Equipment | -1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Hydraulic Shovels 14.4 yd3 | 2 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 1 |
Haul Truck (100 ton) | 16 | 24 | 24 | 24 | 24 | 20 | 16 | 16 | 16 | 14 | 14 | 14 | 3 |
Articulated Truck (43.5 ton) | 2 | 4 | 4 | 4 | 4 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 |
Wheel Loader 15 yd3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Wheel Loader 9 yd3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Service Wheel Loader | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Diesel Drill (4.5 to 8.5 in) | 4 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 2 |
Secondary Drill (4.5 to 5.5 in) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
16.6.4 | SUPPORT AND ANCILLARY EQUIPMENT |
Four 433 kW dozers will be required for waste dump management along with two 372 kW wheel dozers for shovel cleanup. Two 16 ft (4.9 m) graders will be used to maintain roads during the pre-stripping year, increasing to three graders during the first year of production and decreasing to one grader in the last year of production. Table 16.10 and Table 16.11 list support and ancillary equipment requirements for the duration of the mine.
Table 16.10 Support Equipment Requirements
| | Year |
Equipment | -1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Track Dozer (433 kW) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
Wheel Dozer (372 kW) | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 |
Grader (16 ft) | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 1 |
Water Truck (10,000 gal) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Vibratory Compactor | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Integrated Tool Carrier | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Excavator | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
NovaCopper Inc. | 16-19 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 16.11 Ancillary Equipment Requirements
| Year |
Equipment | - 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Flatbed Truck | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Fuel/Lube Truck | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
Mechanics Service Truck | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Welder Truck | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Tire Service Truck | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Snow Plow/Sanding Truck | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Pick-up Truck | 8 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 6 |
Truck Mounted Hydraulic Crane | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Rough Terrain Forklift | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Shop Forklift | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Light Plant/Towers | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Mobile Radios | 50 | 100 | 100 | 100 | 100 | 100 | 81 | 81 | 81 | 81 | 81 | 81 | 30 |
Safety Equipment | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Engineering/Geology Equipment (computers, software, licenses) | 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
|
Maintenance Management System | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Explosives Plant (facilities and buildings) | 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| 1
|
Surveying | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Mining labour requirements were estimated based on a 12-hour long shift, 2 shifts per day and a 2-week-on/2-weeks-off rotation schedule.
Operator and maintenance staff requirements are estimated based on the scheduled hours. Operational management labour and staff numbers were estimated from experience with existing mines and anticipated operating conditions for the Arctic Project.
Staff and hourly operating rates are based on the base rates and burdens. A benefit package of 40% was applied to both salaried staff and the hourly labour base rates. The labour burden consists of vacation, statutory holidays, medical and health insurance, employment insurance, long-term disability insurance, overtime, shift differential and other factors.
The LOM maximum number of mine management staff on payroll is 67. The mining operator and maintenance labour on payroll is shown in Table 16.12.
NovaCopper Inc. | 16-20 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 16.12 Operator and Maintenance Staff on Payroll
| Year |
Staff | -1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
Operators | 130 | 200 | 199 | 197 | 197 | 180 | 154 | 154 | 153 | 147 | 148 | 148 | 58 |
Maintenance | 62 | 97 | 97 | 96 | 96 | 90 | 79 | 79 | 78 | 76 | 76 | 76 | 32 |
Total | 192 | 297 | 296 | 293 | 293 | 270 | 233 | 233 | 231 | 223 | 224 | 224 | 90 |
NovaCopper Inc. | 16-21 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
A 10,000 t/d process plant has been designed to process the massive and semi-massive sulphide mineralization of the Arctic Property. The main economic elements found in the deposit are copper, zinc, lead, and associated gold and silver. The process plant will operate two shifts per day, 365 d/a with an overall plant availability of 92%. The process plant will produce three concentrates: 1) copper concentrate, 2) zinc concentrate, and 3) lead concentrate. Gold and silver are expected to be payable at a smelter and are recovered in both the copper and lead concentrates. The process plant feed will be supplied from the Arctic open pit mine.
The mill feed will be hauled from the open pit to a primary crushing facility where the material will be crushed by a jaw crusher to a particle size of 80% passing 125 mm.
The crushed material will be ground by two stages of grinding, consisting of one SAG mill and one ball mill in closed circuit with hydrocyclones (SAB circuit). The hydrocyclone overflow with a grind size of approximately 80% passing 70 µm will first undergo pre-talc flotation, and then be processed by conventional bulk flotation (to recover copper, lead, and associated gold and silver), followed by zinc flotation. The rougher bulk concentrate will be cleaned and followed by copper and lead separation to produce a lead concentrate and a copper concentrate. The final tailings from the zinc flotation circuit will be pumped to the TSF. Copper, lead, and zinc concentrates will be thickened and pressure-filtered before being transported by truck to a port and shipped to smelters.
The average annual dry concentrate production is estimated as follows:
| • | copper concentrate: 203,400 t/a |
| | |
| • | lead concentrate: 23,400 t/a |
| | |
| • | zinc concentrate: 144,100 t/a. |
17.1.1 | FLOWSHEET DEVELOPMENT |
The process flowsheet is based on the 2012 SGS laboratory test work results conducted on the sample materials from the Arctic Deposit.
The process plant will consist of the following unit operations:
| • | crushing: |
| | |
| | - primary crushing by a jaw crusher |
NovaCopper Inc. | 17-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| | - | associated conveying and dust suppression systems |
| | | |
| • | grinding and flotation: |
| | |
| | - | primary grinding by a SAG mill and secondary grinding by a ball mill |
| | - | talc pre-flotation |
| | - | bulk copper and lead rougher/cleaner flotation |
| | - | copper and lead separation flotation |
| | - | zinc rougher/cleaner flotation |
| | - | concentrate dewatering and load out, including water treatment for the water generated from copper and lead concentrate thickeners |
| | - | tailings disposal to the TSF. |
The simplified process flowsheet is illustrated in Figure 17.1.
NovaCopper Inc. | 17-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 17.1 Simplified Process Flow Diagram
NovaCopper Inc. | 17-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
MAJOR DESIGN CRITERIA
The process plant is designed to process 10,000 t/d, equivalent to 3,650,000 t/a. The major design criteria developed for the Arctic Project are outlined in Table 17.1.
Table 17.1 Major Design Criteria
Design Criteria | Unit | Value |
Daily Processing Rate | t/d | 10,000 |
Operating Days per Year | d/a | 365 |
Operation Schedule | - | two shifts/day; 12 hours/shift |
Crushing Availability | % | 65 |
Grinding/Flotation Availability | % | 92 |
Abrasion Index | g | 0.046 |
Bond Ball Mill Work Index | kWh/t | 11.1 |
Crushing |
Nominal Processing Rate | t/h | 641.0 |
Crusher Feed Particle Size | mm | less than 1,000 |
Primary Crushing Product Particle | mm | 125 |
Size, 80% Passing | | |
Grinding |
Nominal Processing Rate | t/h | 452.9 |
Primary Grind Size, 80% Passing | µm | 800-900 |
Secondary Grind Size, 80% Passing | µm | 70 |
Grinding Recirculating Load | % | 300 |
Flotation | | |
Flowsheet
| -
| Conventional flotation, including: i) talc pre-flotation, ii) copper-lead bulk flotation, iii) zinc flotation, and iv) copper/lead separation flotation |
OPERATING SCHEDULE AND AVAILABILITY
The process plant is designed to operate on the basis of two shifts per day, 365 d/a. The crushing circuit overall availability will be 65%. The grinding and flotation availability will be 92%. These design availabilities will allow for scheduled and unscheduled maintenance as well as potential weather interruptions.
17.1.2 | PROCESS PLANT DESCRIPTION |
CRUSHING PLANT
Run-of-mine (ROM) material will be trucked to a 200 t receiving dump bin equipped with a stationary grizzly screen with an opening of 1,000 mm. The undersize of the screen will be fed to a primary jaw crusher driven by a 250 kW motor. The nominal crushing rate designed is 641 t/h. A rock breaker will be provided to break oversize rocks retained on the screen.
NovaCopper Inc. | 17-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
ROM material will be crushed by the jaw crusher to 80% passing 125 mm. The crusher product will be conveyed to a 10,000 t live capacity stockpile.
A dust collection system will be provided to control fugitive dust generated during crushing and transport of the materials. A magnet will be provided over the crusher discharge conveyor to remove any steel pieces, which will protect the downstream conveyor.
The main equipment in the crushing area will include:
| • | one 1,000 mm stationary grizzly |
| • | one hydraulic rock breaker |
| • | one primary grizzly feeder, 1,600 mm wide by 6,100 mm long |
| • | one jaw crusher, 1,200 mm by 1,600 mm; driven by a 250 kW motor |
| • | one belt scale |
| • | one belt magnet |
| • | one jaw crusher discharge conveyor |
| • | one stockpile feed conveyor |
| • | one baghouse/dust collector. |
17.1.3 | COARSE MATERIAL STORAGE |
The coarse material stockpile will have a live capacity of 10,000 t which is equal to 1 day of mill feed at the nominal mill feed rate, or a dead capacity of approximately 40,000 t. The coarse material stockpile will be a covered facility to effectively control the dust spreading and to mitigate freezing of the stockpiled material. The coarse material stockpile will be equipped with sufficient building access to allow for the operation of mobile equipment to work the pile as required. The stockpiled material will be reclaimed from the stockpile by three 900 mm wide by 5.1 m long apron feeders at a nominal rate of 226 t/h per feeder. Reclaimed material from the apron feeders will be discharged onto one 900 mm wide by 135 m long SAG mill feed conveyor.
The stockpile reclaim area will also be equipped with a dust collection system to minimize the spread of dust generated during transport of the crushed material.
17.1.4 | GRINDING AND CLASSIFICATION |
PRIMARY GRINDING AND CLASSIFICATION
The primary grinding circuit will consist of one 7.3 m diameter by 3.8 m long SAG mill equipped with a trommel screen. The SAG mill will be driven by one 3,000 kW motor. Crushed material will be conveyed from the stockpile to the SAG mill feed chute and then to the SAG mill. The SAG mill will be equipped with 50 mm pebble ports for the removal of undersize material. Mill discharge from the SAG mill will be screened by the SAG mill trommel. The trommel undersize material will flow by gravity to a sump where the ball mill discharge will report to as well. The blended slurry will be pumped to the hydrocyclone cluster. Oversized material from the trommel will be sent to a surge bin and then trucked to the TSF for disposal. As required, steel balls will be added into the SAG mill to maintain grinding efficiency. The estimated primary grind size is 80% passing 800 to 900 µm.
NovaCopper Inc. | 17-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
SECONDARY GRINDING AND CLASSIFICATION
The secondary grinding circuit will include one ball mill in closed circuit with one hydrocyclone cluster. The SAG mill product will be pumped to the hydrocyclone cluster along with the ball mill discharge. The hydrocyclone underflow will gravity-flow to the ball mill while the hydrocyclone overflow, with a solid density of 33% w/w, will be sent downstream to the copper and lead bulk flotation circuit. The proposed circulation load for the closed circuit is 300%.
The grinding circuit will further grind the SAG mill product to 80% passing 70 µm. The major equipment in the secondary grinding circuit will include:
| • | one 5.5 m diameter by 8.8 m effective grinding length (EGL) ball mill, driven by |
| | one 4,500 kW motor |
| • | one hydrocyclone cluster, consisting of ten 660 mm diameter hydrocyclones |
| | (8 operating, 2 in standby). |
As required, steel balls will be added into the ball mill to maintain grinding efficiency. Zinc cyanide, a sulphide mineral suppressing reagent, will be added to the ball mill discharge pump box.
The hydrocyclone overflow slurry will be processed by conventional flotation to recover the target minerals. Flotation will consist of talc pre-flotation, copper-lead bulk flotation to produce a bulk copper-lead concentrate, and subsequent copper and lead separation flotation to produce a copper concentrate and a lead concentrate. The copper-lead bulk flotation tailings will be conditioned and floated to produce a zinc concentrate. The zinc flotation tailings, which are the final tailings product, will be pumped to the TSF for storage.
TALC FLOTATION
The hydrocyclone overflow with 33% solids will be floated in two 100 m3 tank-type flotation cells to remove talc, which may impact copper and lead flotation and concentrate quality. Depending on the copper, lead, and zinc content of the talc product, the talc rougher flotation concentrate may be further cleaned to reject any entrained sulphide minerals. The pre-flotation tailings will be directed to the copper-lead bulk flotation circuit, while the talc concentrate will be sent to the final tailings pump box to be pumped to the TSF, together with the zinc rougher scavenger flotation tailings and the first zinc cleaner scavenger flotation tailings.
NovaCopper Inc. | 17-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
COPPER-LEAD BULK FLOTATION AND REGRINDING
The talc pre-flotation tailings will flow into the copper-lead bulk flotation conditioning tank where copper-lead mineral collectors will be added. The conditioned slurry will be floated in six conventional 100-m3 tank-type flotation cells, five cells for rougher flotation and one for rougher/scavenger flotation. The concentrate from the rougher bulk flotation circuits will be reground in a tower mill, which is driven by one 750 kW motor. The mill will be in closed circuit with ten 250 mm diameter hydrocyclones to grind the bulk concentrate to a particle size of 80% passing 35 to 40 µm prior to being further upgraded by two stages of cleaner flotation.
The first stage of copper-lead bulk cleaner flotation will be conducted in one 4.0 m diameter by 11.0 m high flotation column. The first cleaner flotation tailings will be scavenged to further recover copper-lead minerals in two 20 m3 tank-type flotation cells. The concentrate from the first cleaner/scavenger flotation will flow to the regrinding pump box for further regrinding, while the tailings produced from the flotation stage will be sent to the copper-lead rougher/scavenger tailings pump box where the combined slurry will be pumped to the zinc flotation circuit.
The copper-lead concentrate from the first cleaner flotation stage will be pumped to the second cleaner flotation stage. Secondary cleaner flotation will be conducted in one 4.0 m diameter by 10.0 m high flotation column. The concentrate from the copper-lead second cleaner flotation will be pumped to the copper-lead bulk concentrate thickener prior to being pumped to the copper and lead separation flotation circuit. The overflow of the thickener will be sent to the process water tank for reuse. The tailings from the copper-lead secondary cleaner flotation will return to the copper-lead first cleaner flotation.
Copper-lead rougher flotation and cleaner flotation will be carried out at a pH of 8.0 to 8.5. Reagents used in the circuit include:
| • | zinc cyanide as depressant |
| • | SIPX and 3418A as collectors |
| • | MIBC as frother. |
The major process equipment used in the copper-lead bulk flotation circuit includes:
| • | one 4.0 m diameter by 4.5 m high conditioning tank |
| • | six 100 m3rougher and scavenger flotation cells |
| • | one tower mill with an installed power of 750 kW |
| • | ten 250 mm hydrocyclones (eight operating, two standby) |
| • | one 4.0 m diameter by 11.0 m high flotation column for first cleaner flotation |
| • | two 20 m3tank flotation cells for first cleaner/scavenger flotation |
| • | one 4.0 m diameter by 10.0 m high flotation column for second cleaner flotation |
NovaCopper Inc. | 17-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | one 10.0 m diameter high rate thickener for the cleaned bulk concentrate. |
Copper-Lead Separation Flotation Circuit
The underflow of the copper-lead bulk cleaner concentrate thickener will be pumped to the copper-lead separation flotation conditioning tanks, where sodium cyanide and lime will be added to suppress copper minerals. The conditioned slurry will flow to lead rougher flotation cells. Lead collector will be added in the second conditioning tank to collect lead minerals. The lead concentrate produced from the lead rougher and rougher/scavenger flotation cells will be pumped to the first lead cleaner flotation circuit. The tailings of the rougher/scavenger flotation, which is the copper concentrate, will report to the copper concentrate thickener.
The lead concentrates from the lead rougher and scavenger flotation circuit will be further upgraded by three stages of cleaner flotation. The first stage of cleaner flotation will consist of first lead cleaner flotation and cleaner scavenger flotation. The lead concentrates from the first stage of cleaner flotation will be fed to the second stage of lead cleaner flotation. The lead cleaner/scavenger tailings, together with the lead rougher/scavenger concentrate, will report to lead rougher flotation. The second lead cleaner flotation concentrate will be further upgraded by the third stage of cleaner flotation to produce the final lead concentrate, which will report to the lead concentrate thickener. Tailings from the second and third stages of cleaner flotation will be forwarded to the proceeding flotation cell feed boxes.
Lead flotation will be conducted at a pH ranging from 9.0 to 9.5. Reagents used in the circuit include:
| • | lime for adjusting slurry pH |
| • | sodium cyanide as a copper mineral depressant |
| • | 3418A as collector |
| • | MIBC as frother. |
The copper- lead flotation circuit consists of:
| • | two 2.8 m diameter by 3.0 m high conditioning tanks |
| • | five 20 m3lead rougher and rougher/scavenger flotation cells |
| • | three 5 m3lead first cleaner and scavenger flotation cells |
| • | one 5 m3lead second cleaner flotation cell |
| • | one 5 m3lead third cleaner flotation cell. |
Zinc Flotation and Regrinding Circuit
The copper-lead rougher scavenger tailings will be further floated to recover zinc in the zinc flotation circuit, along with the copper-lead first bulk cleaner scavenger tailings. The circuit will consist of feed slurry conditioning, rougher/scavenger flotation, zinc rougher concentrate regrinding, and two stages of cleaner flotation.
NovaCopper Inc. | 17-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Tailings from the copper-lead bulk flotation circuit will be sent to the head cell of a bank of zinc rougher and rougher scavenger flotation cells, after being conditioned with lime (to a pH above 10.5, to depress pyrite) and copper sulphate (to activate zinc minerals). The flotation circuit will produce a zinc rougher and scavenger concentrate and zinc rougher scavenger flotation tailings. The concentrates produced will report to the regrinding circuit. Tailings will flow to the final tailings pump box to be delivered to the TSF.
Concentrates from the rougher and scavenger flotation stage will flow to the regrinding pump box, from where the slurry will be pumped to the regrinding hydrocyclone cluster. With a particle size of 80% passing 35 to 40 µm, the overflow of the hydrocyclones will report to the zinc first cleaner and scavenger flotation circuit, while the underflow will gravity flow to a tower mill driven by a 750 kW motor. The slurry discharged from the mill will flow to the hydrocyclone feed pump box.
There will be two stages of zinc cleaner flotation. The zinc cleaner circuit will operate at a pH of 11 or above to reject pyrite. The first cleaner concentrate produced will be further upgraded in the second stage of cleaner flotation. The first cleaner flotation tailings will be further floated in cleaner scavenger flotation cells. Concentrate from the first stage of cleaner scavenger flotation will flow to the zinc regrinding pump box. Tailings from the first stage of cleaner scavenger flotation will flow to the final tailings pump box where tailings will be pumped to the TSF, along with the zinc rougher scavenger flotation tailings and the talc concentrate.
The final zinc concentrate produced from the second stage of cleaner flotation will report to the zinc concentrate thickener, while the second cleaner flotation tailings will be recycled back to the first cleaner flotation column feed pump box
Reagents used in the zinc flotation circuit include copper sulphate, lime, SIPX, and MIBC.
The main equipment used for the zinc flotation circuit consists of:
| • | two 4.0 m diameter by 4.5 m high conditioning tanks |
| • | six 100 m3zinc rougher and rougher scavenger flotation cells |
| • | one 750 kW tower mill |
| • | eight 250 mm hydrocyclones (6 operating, 2 standby) |
| • | one 4.0 m diameter by 10.0 m high flotation column for the first zinc cleaner flotation |
| • | two 20 m3tank cells for the first zinc cleaner scavenger flotation |
| • | one 3.0 m diameter by 8.0 m high flotation column for the second zinc cleaner flotation. |
NovaCopper Inc. | 17-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
PRODUCT DEWATERING
Each of the flotation concentrates will be thickened in its respective thickener, including copper, lead, and zinc concentrates. The concentrates will be further dewatered by pressure filters to a moisture content of approximately 9%. Pressure filtration with an air blowing function has been selected for the Arctic Project in order to achieve a low overall cake moisture.
Copper Concentrate Dewatering
Copper concentrate from the tailings of the lead rougher scavenger flotation will be pumped to a 10 m-diameter high-rate thickener. The copper concentrate will be mixed with diluted flocculant solution at the thickener feed well. The thickener will be operated together with variable frequency drive underflow slurry pumps to condense the underflow to approximately 65% solids. Prior to pressure filtration, the underflow will be pumped to an agitated concentrate stock tank, which is capable of storing the concentrate for more than eight hours.
Thickener overflow will be treated by a sulphur dioxide-air procedure to destroy residual cyanide and reduce dissolved heavy metals prior to being sent to the final flotation tailings pump box from where the slurry is delivered to the TSF.
The final filter cake moisture is expected to be 9%. The copper concentrate will be discharged into a stock bin, from which the concentrate will be automatically loaded onto haulage trucks for shipment. Filtrate from the filtration will return to the copper concentrate thickener.
The in-plant storage and dispatch facility will be capable of storing up to 10 days of copper concentrate production in case of potential truck haulage interruptions caused by inclement weather or other.
The equipment required for concentrate thickening and filtration includes:
| • | one 10 m diameter high rate thickener |
| • | one 7.5 m diameter by 8.5 m high agitated concentrate stock tank |
| • | two 100 m2pressure filters. |
Lead Concentrate Dewatering
The lead concentrate will be blended with the flocculant solution and forwarded to a 3.5 m diameter high-rate thickener. Thickener underflow containing approximately 65% solids will be pumped to an agitated concentrate stock tank prior to pressure filtration. The concentrate stock tank will have the capacity to contain lead concentrate production for at least eight hours. The thickener overflow will be directed to the conditioning tank in the copper and lead separation circuit for reuse or sent to the water treatment circuit that is designed for treating the copper thickener overflow.
NovaCopper Inc. | 17-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The filtrated lead concentrate cake with 9% moisture will be bagged and then loaded into a 20 ft concentrate container, which will be hauled to the ocean port for shipment. The filtrate from the filter will return to the lead concentrate thickener feed well.
The in-plant lead concentrate storage and dispatch facility will be capable of storing at least 10 days of lead concentrate production.
The equipment required for concentrate thickening and filtration includes:
| • | 3.5 m diameter high rate thickener |
| • | 4.0 m diameter by 4.0 m high agitated concentrate stock tank |
| • | one 40 m2pressure filter. |
Zinc Concentrate Dewatering
The final zinc concentrate will be directed to an 8.0 mm diameter high-rate thickener. Flocculant will be added to improve settling of the concentrate. Thickener underflow with a solid density of 65% will be stored in an agitated concentrate stock tank prior to pressure filtration. Thickener overflow will be delivered to the effluent treatment plant or to the final flotation tailings pump box. The concentrate stock tank is designed to be capable of containing zinc concentrate production for at least eight hours.
The final filter cake moisture is expected to be 9%. Filtrate from the filtration will return to the zinc concentrate thickener. The zinc concentrate will be conveyed and discharged to a concentrate stock bin, and then automatically loaded onto trucks for shipment off site to smelters.
The in-plant zinc concentrate storage and dispatch facility will be capable of storing at least 10 days of zinc concentrate production in case of potential interruptions to truck haulage due to inclement weather.
Equipment required for concentrate thickening and filtration includes:
| • | one 8.0 mm diameter high -rate thickener |
| • | one 7.5 m diameter by 8.0 m high agitated concentrate stock tank |
| • | two 70 m2pressure filters. |
TAILINGS DISPOSAL
The final flotation tailings will flow by gravity to the TSF, and includes:
| • | the talc flotation concentrate |
| • | the zinc rougher scavenger tailings |
| • | the zinc first cleaner scavenger flotation tailings. |
NovaCopper Inc. | 17-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The tailings pond will be installed with a reclaim water pump barge, which will reclaim water from the pond to either the process water tank or the water treatment plant.
Tailings management is discussed further in Section 18.0.
REAGENT HANDLING AND STORAGE
Various chemical reagents will be added to the grinding and flotation circuits to modify the mineral particle surfaces and enhance the floatability of the valuable mineral particles into the concentrate products.
The reagents will be prepared and stored in a separate, self-contained area within the process plant and delivered by individual metering pumps or centrifugal pumps to the required addition points. All reagents will be prepared using fresh water.
Preparation of the various reagents will require:
| • | a bulk handling system |
| • | mixing and holding tanks |
| • | metering pumps. |
Collectors
The collector SIPX in a solid form will be shipped to the mine site in bags. The SIPX will be diluted to 20% solution strength in a mixing tank and stored in a holding tank, before being added to the copper-lead bulk flotation circuit and the zinc flotation circuit via metering pumps.
The collector 3418A will be received as a liquid in drum. This collector will be delivered to the lead flotation and the copper-lead rougher flotation circuit via metering pumps without dilution.
Frother
MIBC frother will be received as a liquid in 500 kg drums. The reagent will be used at the supplied solution strength. Metering pumps will deliver the frother to the talc, copper, lead, and zinc flotation circuits.
Lime
Lime will be trucked to the site as unslaked pebbles, and stored in a 100 t-capacity bulk lime silo. Lime will be conveyed to the lime slaker and slaked with water. The slaked lime will be stored in an agitated mixing tank and distributed to the addition points via a lime slurry loop, mostly to the zinc flotation circuits. The slaker will be controlled automatically based on the lime slurry levels in the holding tank.
NovaCopper Inc. | 17-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Flocculant
Solid flocculant will be prepared in a packaged preparation system, including a screw feeder, a flocculant educator, and mixing devices. Flocculant will be diluted to a 0.2% solution strength and added via metering pumps to the copper, lead, and zinc thickeners’ feed wells where the reagent will be further diluted.
Other Reagents
Sodium cyanide, zinc sulphate, and copper sulphate will be supplied in powder/solid form, and will be dissolved and diluted by fresh water. The strength of the reagent solutions will be approximately 20%. Cyanide monitoring/alarm systems will be installed at the cyanide preparation areas. Emergency medical stations and emergency cyanide detoxification chemicals will be provided at the areas as well.
Zinc cyanide will be prepared by mixing the sodium cyanide solution, the zinc sulphate solution, and the lime slurry.
Anti-scale chemicals may be required to minimize scale build-up in the reclaim or recycle water lines. These chemicals will be delivered in liquid form and metered directly into the intake of the reclaim water pumps or process water tank.
A separate reagent system will be provided to occasionally determine the effect of any new reagent on metal recovery and concentrate grading.
Storage tanks will be equipped with level indicators and instrumentation to ensure that spills do not occur during normal operation. Appropriate ventilation, fire and safety protection equipment and devices will be provided at reagent preparation areas.
WATER SUPPLY
There will be two separate water supply systems: a fresh water supply system and a process water supply system. There will also be an effluent treatment plant to treat effluents generated from process and mining operations.
Fresh Water Supply System
Process fresh water will be supplied from the water treatment plant or local creeks. A 10,000 mm by 8,500 mm fresh water/fire water storage tank will hold operating fresh water prior to distribution within the plant. Fresh water will be mainly used for the following purposes:
| • | fire water |
| • | gland and seal water |
| • | mill lubrication cooling water. |
Potable water will be supplied from local creeks and chlorinated prior to delivery to the potable water distribution loop.
NovaCopper Inc. | 17-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Process Water
Process water will be made up of fresh water, and water reclaimed from the TSF. Reclaimed water and fresh water will be directed to an 8.5 m diameter by 10.0 m high process water tank, from where the water will be distributed to the process plant and other service locations.
AIR SUPPLY
Air service systems will supply air to the grinding and flotation plant, as follows:
| • | Flotation: |
| • | - | Low-pressure air will be provided for flotation tank cells by air blowers. High- pressure air will be provided for the flotation column by dedicated air compressors. |
Filtration Circuit: |
| | - | High-pressure air will be provided for filtration and drying by dedicated air compressors. |
| • | Plant Air Service: |
| | - | High-pressure air will be provided for various services by dedicated air compressors. |
| • | Instrumentation Air: |
| | - | Air will come from the plant air compressors; it will be dried and stored in a dedicated air receiver. |
A separate high-pressure air service system will supply air to the crushing plant by a dedicated air compressor. The air will be provided for dust suppression and equipment services.
ASSAY/METALLURGICAL LABORATORY AND QUALITY CONTROL
The final concentrates and intermediate streams will be monitored by two online x-ray diffraction analyzers. The analyzers will be equipped with pH monitoring systems. The assay data will be fed back to the central control room and used to optimize the process conditions. Routine samples of head, intermediate products, tailings, and final products will be collected and assayed in the assay laboratory, where standard assays will be performed. The data obtained will be used for product quality control and routine process optimization.
The assay laboratory will consist of a full set of assay instruments for base metal analysis as well as gold and silver assays, including:
| • | fire assay equipment |
| • | an AAS |
| • | an ICP for the routine assay laboratory |
NovaCopper Inc. | 17-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | an inductively coupled plasma-mass spectrometry (ICP-MS) for the environmental laboratory |
| • | a Leco furnace |
| • | other determination instruments such as pH and redox potential metres and experimental balances. |
The metallurgical laboratory will perform metallurgical tests for quality control and process flowsheet optimization. The laboratory will be equipped with laboratory crushers, ball mills, particle size analysis devices, laboratory flotation cells, balances, and pH metres.
17.2 | PLANT PROCESS CONTROL |
| |
17.2.1 | OVERVIEW |
PLANT CONTROL
The plant control system will consist of a distributed control system (DCS) with personal computer-based operator interface stations (OIS) located in the control rooms of the following areas:
| • | Primary Crushing: A control room will be provided in the primary crushing area with a single OIS. Control and monitoring of all primary crushing and conveying operations will be conducted from this location. |
| • | Mill Building: A central control room will be provided in the mill building with required an OIS. |
In conjunction with the OIS, the DCS will perform all equipment and process interlocking, control, alarming, trending, event logging, and report generation.
The plant control rooms will be staffed by trained personnel 24 h/d.
Programmable logic controllers (PLCs) (or other third party control systems supplied as part of mechanical packages) will interface with the plant control system via ethernet network communication systems when possible.
Operator workstations will be capable of monitoring the entire plant site process operations, and will be capable of viewing alarms and controlling equipment within the plant. Field instruments will be microprocessor-based “smart” type devices. Instruments will be grouped by process area, and wired to each respective area’s local field instrument junction boxes. Signal trunk cables will connect the field instrument junction boxes to DCS input/output (I/O) cabinets.
Intelligent-type motor control centres (MCCs) will be located in electrical rooms throughout the plant. Utilizing an industrial communication protocol interfaced to the DCS, a serial bus network will facilitate remote operation and monitoring of the MCC.
NovaCopper Inc. | 17-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
An automatic sampling system will collect samples from various product streams for online analysis and assessment of daily metallurgical balance.
17.2.2 | PRODUCTION PROJECTION |
Based on the preliminary mine plan and preliminary metallurgical test work, the projected annual concentrate production from the proposed plant is provided in Table 17.2.
NovaCopper Inc. | 17-16 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 17.2 Annual Concentrate Production Projection
NovaCopper Inc. | 17-17 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining | | |
District, Northwest Alaska | | |
18.0 | PROJECTINFRASTRUCTURE |
The proposed Arctic mine site is spread over a distance of approximately 6 km within the upper reaches of the Sub-Arctic Creek Valley. The proposed development for the Arctic Project consists of the following major infrastructure:
| • | roads and an airstrip |
| • | mill buildings and related services facilities including maintenance and truck shops, and assay lab |
| • | water supply and distribution |
| • | waste management |
| • | fuel storage |
| • | on site explosive storage |
| • | power supply |
| • | TSF and water management |
| • | water treatment plant |
| • | construction and permanent camp accommodation |
| • | waste rock storage facilities |
| • | communication. |
All buildings and facilities will be constructed with appropriate HVAC and fire protection systems, water distribution and plumbing systems, and dust control systems.
The location of major project facilities is shown in Figure 18.1.
Mine-site infrastructure has been located to:
| • | take advantage of local topography |
| • | minimize pumping requirements from the mill building to the TSF |
| • | minimize environmental impacts to Sub-Arctic Creek |
| • | minimize snow avalanche mitigation requirements |
| • | reduce the haul distance from the pit to the primary crusher and TSF. |
NovaCopper Inc. | 18-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Crushed material will be conveyed, via an overland conveyor, from the primary crusher to the crushed material stockpile, from which the material will be conveyed to the SAG mill for processing.
At this PEA level review, little survey, geotechnical, hydrological, avalanche, environmental or other constraint information was provided. There was no site specific geotechnical information although permafrost is assumed to exist at the proposed mine site. Tetra Tech did not review any hydrological, avalanche, environmental or other constraint information for the proposed mine site.
No specific civil engineering design criteria were developed at this stage of the Arctic Project review. Instead, typical design criteria developed for similar climate/arctic and remote conditions were applied to the PEA design. This included internal roads and grading criteria. Assumed quantities for drainage systems were incorporated into the cost estimate as drainage channels and ditches were not designed. While an approximate retaining wall quantity was included in the cost estimate, no retaining wall designs were completed for the PEA.
NovaCopper Inc. | 18-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 18.1 Final General Arrangement Layout after 12 years of Operation
NovaCopper Inc. | 18-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
18.2 | ROADS AND AIRSTRIP |
| |
18.2.1 | AMBLER MINING DISTRICT INDUSTRIAL ACCESS ROAD |
There is currently no developed surface access to the Arctic Project area. Access to the Project is proposed to be via a road approximately 340 km (211 miles) long, extending west from the Dalton Highway where it would connect with the proposed Arctic Project area. Although the capital costs of the road are not yet known, NovaCopper has been in discussions with AIDEA regarding the viability of permitting and constructing an access road. Further information regarding the AMDIAR can be found in see Section 21.5.6.
The Arctic Deposit access road branches off from the proposed AMDIAR and ends at the Arctic Deposit. Figure 18.2 shows the overall road location plan showing the relationship of the access road to the proposed Brooks East corridor which eventually connects to the existing Dalton Highway 320 km from the access road intersection.
Figure 18.2 Access to the Arctic Project
The access road is 17 km long from the AMDIAR corridor to the on site mine roads. The grades are relatively gentle in the order of 3 to 5%, with the maximum grade at less than 9%.
NovaCopper Inc. | 18-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The road is located in a permafrost environment. The initial 10 to 12 km is in a lowlands area that shows strong indications of being ice-rich. The recommended approach to construct a road in a permafrost environment is to protect the permafrost from degradation by avoiding cuts and providing sufficient embankment. The embankment height will be greater in the lowlands as it is ice-rich and more susceptible to degradation.
The last 5 km of the road transitions from the valley floor and rises 300 m in elevation, with the last 3 km traversing steep side hills. Where the alignment traverses steep side hill, roadway cuts may be necessary. Cuts would be recommended only if bedrock was very close to the surface.
More information on the access road is provided in Appendix B.
18.2.3 | HAUL ROADS, SITE ROADS, AND PAD AREAS |
The mine site is spread over a distance of approximately 6 km. A network of site roads connecting the pit and the various on site facilities will be constructed throughout the site.
Major site roads will include mine haul roads from the open pit to the primary crusher receiving area, waste rock storage areas and tailings storage areas, and roads to and from the truck shop. These major roads will generally be gravel-surfaced and 30 m wide. The road sub-base and base requirements will be governed by the quality of the subgrade; overall road thickness is expected to be approximately 1 m. The maximum road grade will be 10%. Safety berms will be provided wherever needed.
Other site service roads will interconnect the following facilities and areas:
| • | open pit |
| • | process plant |
| • | coarse crushed stockpile |
| • | main substation/power generation |
| • | primary crushing facility |
| • | maintenance facilities |
| • | camp |
| • | explosives storage |
| • | overland conveyor right of way. |
These roads will generally be 6 to 8 m wide and gravel-surfaced. The roads will be constructed with a maximum grade of 10%.
NovaCopper Inc. | 18-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The proposed location for an airstrip sufficient to support project activities is located in the valley approximately 21 km from the Arctic Project Site (Figure 18.2). Geotechnical data is not available for the site but it is assumed that the facility will require permafrost protection to ensure year round operations.
The airstrip will operate as a private aerodrome and prior permission will be required for all aircraft utilizing the site. The design criteria for the airstrip will include:
| • | Design Aircraft – Dash 8 – Q400/Hercules C130 |
| • | Gravel Airstrip, surfaces will be treated for dust control. |
| • | general dimensions: |
| | - | runway length: 1,524 m |
| | - | runway width: 45 m |
| | - | graded strip either side of runway: 7.5 m |
| | - | side slope, beyond graded strip: 25% (4:1) |
| | - | runway end safety area: 60 m both ends |
| | - | apron capable of parking two Dash 8 – Q400 aircraft |
| | - | 2 m permafrost protection. |
The site will be provided with:
| • | medium intensity light-emitting diode (LED) airfield edge, end, taxiway lighting |
| • | apron flood lighting |
| • | backlit mandatory signage |
| • | lighted wind direction indicators |
| • | Runway End Identification Lighting System (REILS) at both approaches to the runway |
| • | Precision Approach Path Indicators (PAPIs) at both runway touchdown points |
| • | Localizer Performance with Vertical Guidance (LPV) Wide Area Augmentation System (WAAS) |
| • | GPS approach and departure procedures (with vertical guidance) would be developed for both runway. |
More information on the airstrip is provided in Appendix C.
NovaCopper Inc. | 18-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
18.3 | BUILDINGS AND RELEVANT BUILDING SERVICES |
| |
18.3.1 | PRIMARY CRUSHING BUILDING |
The primary crusher will be housed in a pre-engineered building that will also house a control room, an apron feeder, and a crusher discharge conveyor.
ROM material trucked from the pit will be discharged into a dump bin equipped with a stationary grizzly screen. The receiving bin is located outside of the crushing building. The ROM material will be transported to the crusher by an apron feeder. The crushed material will discharge onto the crusher discharge conveyor and then to the overland conveyor to the coarse material stockpile. Sufficient space will be provided inside the building for ongoing operation and maintenance.
18.3.2 | CRUSHED MATERIAL STOCKPILE |
The crushed material stockpile will be fed by the overland conveyor connecting with the primary crushing building. The stockpile with a live capacity of 10,000 t will be covered and equipped with a dust control system. Three apron feeders inside the concrete reclaim tunnel will reclaim the stocked material onto a SAG mill feed conveyor.
The conveyors connecting the stockpile and the SAG mill feed chute and the primary crusher discharge conveyor will be vendor-supplied systems that will include all structural support frames, trusses, bents and take-up structures. The overland conveyors will be supported on concrete pre-cast strip panels/sleepers spaced at regular intervals. Elevated sections of conveyor systems will be supported on vendor-supplied steel trusses spanning between steel bents on concrete spread footings.
18.3.4 | MILL BUILDING, MAINTENANCE, TRUCK SHOP, ASSAY AND METALLURGY LAB |
The mill building will be an engineered post-and-beam steel structure with insulated steel roof and walls. The building foundation will comprise concrete spread footings, grade walls along the building perimeters, and slab-on-grade floor. The floor surfaces will have localized areas sloped toward sumps for cleanup activities.
Interior steel platforms on multiple levels will be provided for ongoing operation and mill facility equipment maintenance. The building will house milling, flotation, reagent preparation/delivering, concentrate dewatering, concentrate storage, concentrate load out, and some offices for mill staff. The building will also house the truck shop and maintenance facilities – (including a wash bay and three repair bays), warehouse, first aid room and emergency vehicle parking, and the assay and metallurgical laboratories. The truck shop will have sumps and trenches constructed to collect waste water in the maintenance bays. Floor hardener will be applied to concrete surface for high traffic areas. The warehouse and repair bays will be serviced by two 10 t overhead cranes.
NovaCopper Inc. | 18-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
All water supply tanks for fresh water and process water supplies will be placed inside the mill building, except diesel fuel storage tanks. The process areas will be serviced by three cranes of various capacities that match specific functions.
The assay and metallurgical laboratories will house all necessary laboratory equipment for sample assay, product quality control and process optimization. The laboratories will be equipped with all appropriate HVAC and chemical disposal equipment as needed. The facility floor will be reinforced as needed to accommodate specialized equipment.
18.3.5 | ADMINISTRATION AND MINE DRY |
The administration and mine dry complex will be a part of the camp complex. This facility will house a mine dry and lockers to service on site mining, process, surface services, and administration personnel and office areas for staff and supervisors. A mud room will also be attached.
Heated arctic corridors will be provided for worker access to main buildings, and to house power cables, heating system piping, and other pipe lines. The corridors will connect the camp, main process plant, and diesel power plant.
Two boilers will provide emergency heat supply for the camp and the main plant building when power generators are not able to produce sufficient heat.
18.3.7 | COLD STORAGE WAREHOUSE |
The cold storage warehouse will be a pre-engineered galvanized steel structure with an un-insulated fabric cover. The building will be supported on pre-cast concrete lock-blocks on a prepared gravel surface.
18.3.8 | HVAC AND FIRE PROTECTION |
All process areas will be heated to a minimum temperature of 5°C on a typical winter day, by recovered waste heat from diesel power generators.
Large process buildings will be ventilated year-round to prevent a build-up of contaminants and humidity. The ventilation rate will rise during summer months. During winter months, heat will be supplied by waste heat from the diesel power plant via glycol pumping.
All staff-occupied areas, such as offices, washrooms, and change rooms, will be heated to a minimum temperature of 20°C on a typical winter day, by supplying filtered and tempered outdoor air mixed with return air. The air will be distributed through ductwork into the individual rooms.
NovaCopper Inc. | 18-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Air conditioning will be limited to control rooms, laboratories, and electrical rooms in which heat generated from electrical equipment is expected to be excessive. Electrical rooms in which heat is not expected to be significant will be cooled with filtered outdoor air. Small rooms, electrical rooms, and remote buildings will be heated using electric heat.
Washrooms, change rooms, print rooms, janitor’s rooms, showers and lunch rooms will be mechanically exhausted to atmosphere. Make-up air will be transferred from adjacent areas, or be supplied with filtered tempered outdoor air.
Each building will be equipped with fire water tanks capable of sustaining enough water for two hours of firefighting at a flow rate equal to the largest sprinkler flow, plus flow from an inside hose and an outside hydrant. The fire water system will be pressurized by a fire water pump package comprising a jockey pump, a main electric pump, and a standby diesel-fired pump.
Dust control systems, comprising dry baghouses, will be installed at the primary crusher building and the coarse crushed material reclaim tunnel.
The dust will be pneumatically conveyed from each exhaust hood to the dust collector through steel ducting, which will include test ports, dampers and cleanouts. Collected dust fines will be returned to the process stream.
Dust will also be controlled at the truck dump, using a series of water spray nozzles, whenever the outdoor temperature is above freezing.
18.4 | WATER SUPPLY AND DISTRIBUTION |
The construction camp will require approximately 320 L/person/d (or 80 m3/d) of potable water to supply a peak of approximately 700 direct workers, staff, and indirect operations personnel during the construction phase and 350 direct workers, staff, and indirect operations personnel during operation of the Arctic Project. A potable water package treatment unit, including a bottling facility for drinking water, will be located close to the administration building. The potable water will undergo chlorination and ultraviolet light treatment.
Fresh water will be pumped from local groundwater wells to fresh and firewater storage tanks, located near each major facility. To ensure adequate firewater levels, two individual reservoirs inside the tank will be separated by an internal standpipe. The tank will be equipped with a level detection control system.
NovaCopper Inc. | 18-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The fire/fresh water tank will be located inside the process building to prevent freezing during winter months. The water pressure will be maintained by booster pumps, jockey pumps and diesel back-up pumps. A plant site alarm will signal a low system pressure condition.
Emergency showers and eyewash stations will be installed throughout the process building.
18.5 | WASTE MANAGEMENT |
| |
18.5.1 | SEWAGE DISPOSAL |
Sewage is calculated based on a provision for 120 L/person/day of sewage to be collected, approximately 40 L/person/d of which will be treated. The proposed treatment plant will be a membrane bioreactor system and chemical phosphorus removal.
18.5.2 | DOMESTIC WASTE DISPOSAL |
Construction and industrial waste will be landfilled within the waste storage bin (WSB) laydown area. Non-hazardous solid construction industrial waste will be buried in the WSB laydown area. Domestic waste from the construction camp and operating areas will be incinerated with the ash buried in the WSB laydown area.
Scrap metal will be collected in bins and recycled by a qualified local contractor.
Several forms of domestic and industrial solid waste will be generated over the life cycle of the mine. All avenues of re-use, reduction and recycling of materials will be examined and implemented prior to disposal of any waste.
The diesel fuel storage comprising three 500,000 L tanks will be housed in a high-density polyethylene (HDPE)-lined, dyked tank farm, located near the truckshop. Fuel dispensing facilities, including fill system for light vehicles as well as fast-fill facilities for mining equipment, will be included.
NovaCopper Inc. | 18-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
18.7 | ON SITE EXPLOSIVES STORAGE |
| |
18.7.1 | EMULSION PLANT |
The emulsion plant will be a 50 m by 50 m facility located near the open pit, approximately 1,000 m from the nearest road or mine building. The explosive facility will include an emulsion plant and emulsion storage.
18.7.2 | DETONATOR AND EXPLOSIVE STORAGE MAGAZINE |
The magazine will be fabricated from a 6 mm metal plate the walls will comprise at least 7.6 cm of bullet-resistant material and the roof will be a 4.7 mm (or thicker) metal plate. The magazine will be mounted on large metal I-beam skids, providing a minimum ground clearance of 10 cm or more for structural rigidity and portability. The magazine will be fabricated in accordance with current storage standards for industrial explosives.
18.8 | POWER SUPPLY TO PLANT SITE |
The Arctic Project will require 15 MW of peak load for 10,000 t/d operation demand. Power will be generated by five self-contained 3.6 MW prime diesel generators. Four units will be in service with the fifth unit reserved for maintenance. Heat will be recovered from the generators and used to heat the mill, camp and related facilities.
18.9 | TAILINGS STORAGE FACILITY |
The co-disposal TSF will be a fully lined facility consisting of rockfill embankment constructed across the Arctic Creek drainage, creating an impoundment that will extend up the drainage. The rockfill embankment will be constructed to an ultimate crest elevation of 655 mamsl with the embankment being raised in stages to minimize the initial capital construction cost. During operations, PAG waste rock will be dumped at the bottom and sides of the basin forming layers with consecutive disposal on tailings that will be filling the voids. The tailings has the potential to generate acid and, therefore, the tailings and the PAG waste rock will be placed under water and remain permanently submerged in order to reduce the potential for acid generation. Additional studies will be required to determine the most suitable method of co-disposal and potential requirements for ARD management and mitigation programs will need to be part of the design of the TSF.
Further details regarding the TSF can be found in Appendix D.
The TSF is designed to contain a total of 110.5 Mm3 over the 12 year life of mine, with 23.8 Mm3to accommodate the tailings at an assumed stored dry density of 1.5 t/m3, and 86.7 Mm3 of PAG waste rock at an assumed stored dry density of 1.9 t/m3. The TSF will be sited as a staged rockfill embankment with an upstream geomembrane liner. The starter embankment will have a crest elevation of 560 m and impound 1 year of mining/processing production, which is approximately 670,000 m3 of tailings and 12.3 Mm3 of waste rock (Figure 18.3).
NovaCopper Inc. | 18-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 18.3 Tailings Storage Facility
The TSF embankment has 2.5:1 (2.5 horizontal to 1 vertical) upstream slope and a 2:1 downstream slope. The ultimate height of the embankment will be approximately 195 m, measured from the downstream toe to the crest of the embankment. The crest of the embankment is designed at 12 m wide to accommodate vehicles and equipment. The embankment is a homogeneous rockfill structure founded on bedrock. NAG waste rock will be used to construct the embankment. A geotextile material will be placed over the upstream slope of the rockfill embankment and below the geomembrane liner, to prevent damage to the lining system from ice. The TSF embankment sections are illustrated in Figure 18.4.
NovaCopper Inc. | 18-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
18.9.2 | TAILINGS IMPOUNDMENT |
It has been assumed that low permeability soils do not naturally exist within the impoundment area of the TSF and a synthetic geomembrane lining system will be required. This system will tie into the geomembrane installed on the embankment, creating a fully lined facility. Construction of the impoundment area will consist of removing the topsoil and vegetation, compacting exposed fine-grained soils and installing the geomembrane. A protective layer will be placed over the geomembrane to prevent damage to the liner.
Figure 18.4 Tailings Embankment Cross Section
18.9.3 | RECLAIM WATER SYSTEM |
Water liberated from the tailings will be collected in a free water pool or supernatant pond formed at the tailings beach/ground interface. This water will be pumped back to the mill for re-use. During operations, the tailings deposition from the embankment crest and southern limit of the impoundment will result in a supernatant pond located at the northern limits of the TSF.
Water from the supernatant pond will be returned to the mill for re-use in the process via a floating barge pump system. The solution will be transferred to the mill via an overland HDPE pipeline.
NovaCopper Inc. | 18-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
18.9.4 | SEEPAGE COLLECTION SUMP |
The seepage collection sump will collect seepage from below the TSF embankment and impoundment for routing back to the supernatant pond. The conceptual design for the seepage collection sump is a vertical sump that is piped to the embankment toe drains, consisting of perforated pipes encapsulated in gravel, and conveyed to the sump where it will be pumped back into the TSF impoundment.
18.10 | WASTE ROCK FACILITIES |
The waste rock produced over the projected 12-year mine life (including one year of preproduction) is summarized in Sections 16.3 and 16.4. The waste schedule is plotted in terms of annual tonnages by waste type: PAG and PAG (Table 16.6). Of the 299.4 Mt of waste rock, 164.8 Mt is currently classified as PAG and 134.6 Mt as NAG.
18.10.1 | NON-ACID GENERATING WASTE ROCK |
NAG waste rock will first be used for the construction of the TSF embankment. Excess NAG waste rock will be stockpiled between the plant site and the TSF (Figure 18.3). Through the LOM, approximately 68.6 Mm3of NAG waste rock will be generated from the mine, while 32.2 Mm3will be used in the construction of the TSF embankment. The remaining 36.4 Mm3will be stored in the stockpile with an ultimate elevation of 1,000 mamsl. The stockpile was designed with a 2:1 slope and will have an ultimate height of 320 m measured from the toe to the top. The waste rock that is NAG will not be submerged upon closure, and will be utilized to construct facility infrastructures (i.e. TSF) throughout the duration of the mine life or will be stored in the NAG stockpile (Figure 18.3).
18.10.2 | POTENTIALLY ACID GENERATING WASTE ROCK |
Approximately 86.7 Mm3of the waste rock is estimated to be PAG waste rock. In order to minimize future oxidation of this PAG waste rock and the associated potential release of contaminants, it is planned to place the PAG waste rock together with the tailings (co-disposal) in the lined TSF keeping the PAG rock permanently under water to limit oxidation and thus prevent generation of ARD (Figure 18.3).
This section describes the proposed measures required for effective management of surface water and sediment during construction and operation of the Arctic Project. Further details can be found in Appendix D.
The overall goal of the water management plan is to:
NovaCopper Inc. | 18-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | minimize the amount of contact water (water resulting from interaction with mine waste and other elements from mining activities) produced during project construction, operation and following closure |
| • | collect contact water to enable reuse, or discharge after treatment (unless |
| | compliance with water quality standards can be demonstrated) |
| • | provide and retain water for mine operations |
| • | provide a basis for management of the freshwater on the site |
| • | minimize the impact of mine construction and operations activities on the natural surface water drainages |
| • | optimize the use of surface water generated within the footprint area of each facility. |
To meet these objectives, the applied design methodology focused on identifying and managing separately all contact water and non-contact water types and also sediment.
The definition and design of separate conveyance systems for each water type was based on the following criteria:
| • | Non-contact water is defined as all surface and subsurface waters from areas not disturbed by the mining project, regardless of its quality. This is water from natural drainage channels that may be intercepted, diverted and discharged into natural drainages located downstream of the project facilities. Non-contact water will be managed mainly through diversion works around specific mine infrastructure and through temporary storage ponds. |
| • | Contact water is defined as all water which will be affected by the proposed mining activities and will require special handling or treatment prior to use or being returned to the natural drainage, to ensure compliance with corresponding Alaskan water quality standards. Contact water is generated when naturally occurring waters come into contact with mining infrastructure, mining generated waste rock or processed materials that alter its physical-chemical properties. This classification also includes water from areas disturbed by mining activities with high potential for generation of increased sediment loads. Contact waters with increased sediment loads will be transported to sediment retention ponds to facilitate the reduction of suspended solids loads through settlement. After reduction of sediment loads, all contact water will be transported to the acid water treatment plant prior to its use in the mineral process or discharged to the natural drainage. |
In summary, contact water is expected in facilities such as the pit, TSF, and NAG stockpile. This water will be collected in designated ponds for treatment, as necessary, prior to its release and will be used in the process to the maximum extent possible. Contact water from direct run-off from the NAG stockpile (and from un-diverted runoff from contributing basins) and other facilities will be diverted to a collection pond, for treatment (if required) and subsequent downstream discharge to natural stream courses.
NovaCopper Inc. | 18-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Contact water from direct run-off from the open pit and any possible groundwater (if any) will be accumulated in the bottom of the operating pit and subsequently pumped via gravity to the tailings pond.
On the other hand, non-contact water will be directed around the facilities via diversion channels or culverts and discharged into the natural drainages upon achievement of sediment removal to acceptable levels.
The following section describes the water management structures expected at each of the following facilities:
| • | open pit |
| • | plant site area |
| • | waste rock facilities |
| • | TSF. |
Separate strategies are considered for the management of contact and non-contact waters and sediments. A summary of the required infrastructure for each plan is shown in Table 18.1 and Table 18.2.
Table 18.1 Components for Management of Non-contact Surface Waters
Infrastructure | Non- contact Water System | Final Disposal |
NAG Stockpile | Diversion Channel | Discharge to Natural Drainage |
Process Plant | Diversion Channel | Discharge to Natural Drainage |
Tailings Dam | Diversion Channel | Discharge to Natural Drainage |
Table 18.2 Components for Management of Contact Surface Waters and Sediments
Infrastructure | Contact Water System | Final Disposal |
NAG Stockpile | Drains, Perimeter Channel and Sediment Ponds | Tailings Pond or Acid Water Treatment Plant |
Tailings Dam | Drains And Collection Sump | Acid Water Treatment Plant (if needed) |
Open Pit | In-pit Sump | Tailings Pond |
OPEN PIT
The open pit footprint will be dynamic as mining progresses and will be treated as a closed system with all direct rainfall and local runoff being treated as contact water and collected in a sump located in the pit bottom. The captured water will be pumped and conveyed via gravity to the tailings pond.
NovaCopper Inc. | 18-16 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
PLANT SITE
The plant site facility will be located north of the NAG stockpile. This facility will have a diversion channel around the entire facility and will route non-contact surface runoff from west, north and east catchments areas. All the runoff collected by the diversion channel will discharged to the natural drainage located downstream of the TSF collection sump.
WASTE ROCK DUMP
Given that all contact waters are linked to the waste rock facilities, proper water management will require that all direct surface runoff and all seepage water from the waste rock facilities is collected and conveyed via gravity to the tailings pond.
All direct surface runoff will be collected and controlled via a series of surface channels and drains around the immediate perimeter of the slopes of the waste rock facilities. Seepage collection structures will comprise of a set of perforated pipes and drains that will be located beneath and at the base of the waste rock facilities in order to capture and convey water to the toe of the waste rock facilities. Both surface water runoff and seepage collection systems will discharge via gravity to the tailings pond. From the tailings pond, water will be pumped to the water treatment plant when needed.
In addition to the contact water management structures, the waste rock facilities will have diversion channels located on the east and west side of the structure. This channels will conveyed non-contact surface runoff from existing catchments to the natural drainage located downstream of the TSF collection sump.
TSF
Water management structures expected for the TSF include (1) reclaim water system, (2) seepage collection system and (3) diversion channels.
Reclaim Water System
All water from the tailings will be collected in a supernatant pond formed at the tailings and will be returned to the mill for re-use in the process via a floating barge pump-back system. This solution will be transferred to the mill by a pipeline.
Seepage Collection System
The seepage collection sump will collect seepage from below the TSF embankment (baseflow expected to come from the existing upstream watercourse) via an under-drain system. The under-drain system will be composed of perforated pipes encapsulated in gravel. The seepage collection system will be used for monitoring and will be directed to the AWTP if needed.
Diversion Channels
Two diversion channels (west and east) will be constructed to direct surface water runoff around the TSF during the life of the Arctic Project. The water diversion system associated to the TSF will collect and divert non-contact surface runoff from upstream to the natural drainage located downstream of the proposed collection sump.
NovaCopper Inc. | 18-17 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
It is estimated that temporary diversion channels will be constructed during operations and will be removed as operations progress.
18.12 | WATER TREATMENT PLANT |
An allowance of $9 million has been included in the capital cost estimate for a water treatment facility.
18.13 | CONSTRUCTION AND PERMANENT CAMP ACCOMMODATION |
On site camp accommodations for construction personnel will be provided during the construction phase. The current design will include:
| • | 700 single-occupancy rooms |
| • | a dormitory building |
| • | a kitchen |
| • | a recreation complex |
| • | an administration complex |
| • | a sewage treatment facility |
| • | potable water supply system. |
After construction is completed, a portion of the temporary camp will be dismantled; the remaining camp will be refurbished and will comprise 350 single-occupancy rooms as well as the above facilities.
The telecommunications design for the Arctic Project will incorporate proven, reliable, and state-of-the-art systems to ensure that personnel at the mine site will have adequate data, voice, and other communications channels available.
The telecommunications system will be supplied as a design-build package. The base system will be installed during the construction period, and then expanded to encompass the operating plant. The design will include:
| • | a Voice over Internet Protocol (VoIP) telephone system |
| • | satellite communications for voice and data |
| • | Ethernet cabling for site infrastructure |
NovaCopper Inc. | 18-18 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | wireless Internet access |
| • | two-way radio communications at site |
| • | satellite TV. |
NovaCopper Inc. | 18-19 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
19.0 | MARKETSTUDIESANDCONTRACTS |
The Arctic Project will produce copper, lead and zinc concentrates. The copper and zinc concentrates will be shipped out in bulk while the lead concentrate will be shipped off site in containers. These concentrates will be trucked to Port MacKenzie located north of Anchorage, then the concentrates will be transported by ocean to smelters. This port operates 12 months per year and provides good access to Asia.
There are no market studies or contracts material to the Arctic Project, other than the NANA Agreement described in Section 4.3.2, that are required for property development.
NovaCopper Inc. | 19-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
20.0 | ENVIRONMENTAL STUDIES, PERMITTING, |
| AND SOCIAL OR COMMUNITY IMPACT |
This section characterizes the existing environmental baseline data for the Arctic Project area, makes suggestions for additional studies that would provide a basis for the mine permitting efforts, describes the major environmental permits that will likely be required for the Arctic Project, and identifies potential significant social or community impacts.
20.1 | ENVIRONMENTAL STUDIES |
The Arctic Project area includes the Ambler Lowlands and the Subarctic Creek drainage and would be sited within the Shungnak River drainage. To date, a limited amount of baseline environmental data collection has occurred in the area including surface water quality sampling, wetlands mapping, stream flow monitoring, aquatic life surveys, subsistence, meteorological monitoring, and acid base accounting data. The existing data are summarized in Sections 20.1.1 to 20.1.5.
20.1.1 | HYDROLOGY AND WATER QUALITY DATA |
A number of sampling efforts have been used to characterize the hydrology in the Arctic Project area. In 2007, 2008 and 2009, Shaw Environmental collected water quality samples and measured stream flow at 13 stations on the Shungnak River, Subarctic Creek, Arctic Creek, and the Kogoluktuk River (Shaw 2007 to 2009).
In July 2010, Tetra Tech performed baseline studies to characterize flow and water quality in streams and other actively flowing drainages that could be potentially impacted by construction and operation of a proposed access road between the Bornite airstrip and the Arctic airstrip, and the existing road between the Arctic airstrip and the Arctic Deposit. Tetra Tech collected water quality and flow data at 14 sites. The results of the Tetra Tech sampling program indicate that, in general, the water quality for all meets applicable Alaska State water quality standards (WQS) for the parameters analyzed. It is noteworthy that the samples were collected during base flow conditions in the absence of any rainfall events. Since these data were conducted during low flow, they can be used to characterize baseline water quality conditions prior to any site disturbance. The Tetra Tech studies are described in detail in Arctic Deposit Access Environmental Baseline Data Collection – Hydrology, Ambler Mining District, Alaska (Tetra Tech 2010a).
NovaCopper Inc. | 20-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Tetra Tech also performed a program of jurisdictional wetlands identification in a portion of the Arctic Project area in 2010 as part of a study to identify potential road alignment alternatives between the Bornite and Arctic airstrips. The work included data review, vegetation mapping, aerial photographic interpretation (segmentation), and field soil surveys. The work is described in detail in Arctic Deposit Access Environmental Baseline Data Collection - Wetlands & Vegetation, Ambler Mining District, Alaska (Tetra Tech 2010b) and is summarized in this section.
The area between the Bornite airstrip and the Arctic airstrip consists of a wide valley containing the Ambler Lowlands and the Shungnak River. Wetlands are prevalent throughout much of the Ambler Lowlands. The majority of the wetlands within the area occur within tundra communities composed primarily of ericaceous shrubs, such as bog blueberry shrubs (Vaccinium uliginosum and V. vitis-ideae) and graminoids, such as cottongrass (Eriophorum vaginatum) and sedges (Carex bigelowii and C. aquatilis). Spruce forests (Picea glauca and P. mariana) and shrub birch communities (Betula nana and B. glandulosa) make up most of the upland communities.
Owing largely to the low resolution of the aerial imagery, Tetra Tech ultimately used secondary indicators including colour, texture (shadows), local topography, orientation, and slope in the vegetation mapping process. Using the combination of the aerial imagery, ground field reconnaissance surveys, contour mapping and these secondary indicators, Tetra Tech was able to make a distinction between wetland and upland vegetation communities.
Tetra Tech’s sampling efforts in 2010 included baseline aquatic life surveys in the area along the proposed road alternatives between the Bornite airstrip and Arctic airstrip, and along the Arctic airstrip to Arctic Deposit road in Subarctic Creek. The purpose of this study was to characterize the aquatic life within the Shungnak River and potentially impacted tributaries. Opportunistic observations were also collected in the Kogoluktuk River. Fish and macroinvertebrate data were collected from July 8 to 14, 2010. The study is described in detail in Arctic Deposit Access Environmental Baseline Data Collection – Aquatics, Ambler Mining District, Alaska (Tetra Tech 2011) and is summarized in this section.
Tetra Tech employed active fish capture methods to assess the local fishery population, and backpack electrofishing gear to sample reaches of smaller streams. Tetra Tech also employed passive fish capture techniques, including gill netting, minnow traps, hoop nets and visual observation.
The aquatics sampling plan closely followed the streams included in Tetra Tech’s water quality sampling campaign. Six different fish species were captured or observed in the study area as summarized in Table 20.1 and excerpted from Tetra Tech (2011). The lack of large or anadromous fish in sampled sections of the Shungnak River is likely the result of the presence of a waterfall, estimated to be 4.5 to 9 m tall, situated downstream of the Arctic Project area.
NovaCopper Inc. | 20-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 20.1 Captured or Observed Fish Species
Common Name | Scientific Name | Number Captured/Observed | Capture/Observation Location* |
Slimy sculpin
| Cottus cognatus
| 122
| SUB-01, RUB-01, STR-01, STR-02, STR-03, STR-05, SHU-03 |
Alaska blackfish | Dallia pectoralis | 1 | STR-05 |
Northern pike | Esox lucius Linnaeus | 2 | SHU-04, KOG |
Round whitefish | Prosopium cylindraceum | 140 | RUB-01, SHU-01, SHU-02, SHU-03, KOT-01 |
Dolly Varden
| Salvelinus malma
| 39
| SUB-01, SUB-02, RUB-01, STR-03, STR-04, STR- 05, KOT-01 |
Arctic grayling
| Thymallus arcticus
| 159
| SUB-01, STR-03, STR-05, SHU-01, SHU-02, SHU-03, SHU-04, KOG, KOT-01 |
Notes:*SUB = Sub-Arctic Creek; RUB = Ruby Creek; STR = Unnamed Stream Designation;
SHU = Shungnak River; KOG = Kogoluktuk River; KOT = Unnamed Kogoluktuk River Tributary
Benthic macroinvertebrates were also collected during the July 2010 survey period from nine monitoring sites. The overriding goal of this assessment was to describe conditions as they existed at that time as there were no known previous data that could be used for comparison. Applying indices of water quality and overall stream health, to the results of the macroinvertebrate sampling, showed that most of the sampled streams in the Arctic Project area are in good ecological condition. They generally demonstrate relatively high levels of species diversity and species richness although results varied from stream to stream.
Total species abundance and richness, Ephemeroptera, Plecoptera, Trichoptera (EPT) index, and Fine Sediment Biotic Index (FSBI) metrics were plotted as a measure of stream health in the survey area. That data is illustrated in Figure 20.1 and excerpted from Tetra Tech (2011).
Based on these metrics, six monitoring sites in Subarctic Creek, Ruby Creek and an unnamed creek (SUB-01, SUB-02, STR-03, STR-04, RUB-01 and SHU-01) exhibit higher levels of stream health and therefore have greater sensitivity to impairment from sediment or changes in water quality. Analysis of monitoring sites in some of the unnamed creeks (STR-01, STR-02 and STR-05) suggest these streams exhibit lower levels of stream health and would likely show less sensitivity to effects from development.
NovaCopper Inc. | 20-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 20.1 Comparison of Benthic Macroinvertebrate Community Measures
Access to the Arctic Project requires access through private lands owned by NANA. NovaCopper acknowledges the importance of subsistence, as such, a Subsistence Subcommittee of the Oversight Committee comprised of locally appointed residents from six potentially affected communities in the region has been formed to review and discuss subsistence issues related to the project and to develop future compliance plans. A representative from NANA and NovaCopper facilitate the meetings and report a summary of the discussions and recommendations provided by the Subsistence Subcommittee to the Oversight Committee.
A formal subsistence survey has not been performed in the immediate vicinity; however, NovaCopper has established a workforce “Wildlife Log” to document potential subsistence resources, species diversity and human/wildlife encounters. In 2012, Stephen R. Braund & Associates completed a subsistence data gap memo under contract to the Alaska Department of Transportation and Public Facilities as part of the baseline studies associated with a proposed road to the Ambler mining district. The purpose of this analysis was to identify what subsistence research had been conducted for the potentially affected communities, determine if subsistence uses and use areas overlap with or may be affected by the project, and identify what, if any, additional information (i.e., data gaps) needed to be collected in order to accurately assess potential effects to subsistence (Braund 2012). Among other topics the report outlined historic subsistence uses including maps and a literature review, and also provided a synopsis by village including those villages closest to the Arctic Project, and suggested further study.
NovaCopper Inc. | 20-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Previous sampling efforts have established the presence of various salmon species, northern pike and sheefish in the Kogoluktuk River. Sampling efforts in the Shungnak River have established the presence of northern pike. The presences of fish are good indicators of the possibility of subsistence use of these rivers, but boat access is limited due to waterfalls and rapids. In comparison, the Kobuk River, a wide and easily navigable river on which the communities of the region exist, supports the bulk of subsistence fishing.
Determining the presence and distribution of caribou is complex because of seasonal and annual variability in migration patterns. In 2012, Tetra Tech provided a report to NovaCopper outlining options for documenting the caribou migration patterns in the area and the subsistence use of caribou and other resources by the three communities (Ambler, Shungnak, and Kobuk) closest to the Arctic Project area. The ADF&G also has information about caribou population density and migration patterns in the area (ADF&G 2011).
The NWAB, through its Title 9 Conditional Use permit, regulates the project with respect to caribou interactions to assure the migration is minimally affected by mining and exploration activities. To this end, NovaCopper has been in contact with the ADF&G wildlife biologists to monitor movements of caribou in the spring and fall in proximity to the Arctic Project. Radio collar data provided by the State of Alaska is used to track herd movements. Summary maps of those movements constructed from years of radio collar information indicate three main migration corridors to the west of the Arctic Project area, the nearest one is approximately 48 km west of the Arctic Project area.
20.1.5 | ACID BASE ACCOUNTING DATA |
Two sampling efforts have been used to characterize the acid generation potential of the mine waste for the Arctic Project, and the constraints that this may place on either open pit or underground mining development. In 1998, Robertson collected 60 representative core samples from the deposit for their acid/base characteristics; these samples provided a broad assessment of ARD at the Arctic Deposit with a focus on characterization for surface development. In 2010, SRK collected 148 samples and prepared a preliminary ML and ARD analysis of the ML/ARD potential of waste rock at the Arctic Deposit (SRK 2011). The SRK report focuses on characterization for underground development rather than an open pit scenario; however, it does provide a more refined analysis of ARD potential based on advances that have been made in understanding the importance of sulphide mineralogy in assessing ARD. The criteria used for classifying ARD potential also differs slightly from the Robertson era work.
Based on recommendations from SRK, Tetra Tech used total sulphur percent as a proxy for AP and calcium percent as a proxy for NP to better characterize ABA in an open pit mine plan scenario. Overall, 55% of the mine waste rock is currently classified as PAG.
NovaCopper Inc. | 20-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
20.1.6 | ADDITIONAL BASELINE DATA REQUIREMENTS |
Additional baseline environmental data in the Ambler Lowlands, the Subarctic Creek drainage, the Shungnak River drainage and downstream receiving environments will be required to support future mine design, development of an EIS, permitting, construction and operations. NovaCopper is advised to consult with state, local and federal regulatory agencies and their consultants to further develop a comprehensive environmental baseline program. Owing to the long lead-time to collect data (years), it is important that the comprehensive environmental baseline program generates adequate data in terms of type, quality and quantity for each of the disciplines of interest. Recommendations for additional baseline studies are included Table 20.2.
Table 20.2 Additional Recommended Environmental Baseline Studies
Discipline | Recommended Studies |
Acid-Base Accounting | Additional static test work of waste lithogeochemical domains within and adjacent to the proposed open pit and borrow sources and tailings followed by kinetic test work. |
Archaeology | Assessment of cultural resources, cultural site clearance |
Aquatic Life | Expanded aquatic surveys (invertebrates) |
Ecosystem and Soils | Permafrost and wetlands delineation mapping; vegetation surveys |
Fisheries | Expanded fisheries survey |
Hydrogeology | Installation and monitoring of groundwater wells in the Subarctic Creek drainage areas near the site of, and down gradient of, the proposed tailings and waste rock storage facilities and in alternative sites for tailings and waste rock disposal |
Hydrology | Snow survey |
Meteorology, Air | Expansion of the meteorological program to additional locations to be determined; |
Quality, and Noise | air quality monitoring |
Wildlife | Avian survey, large mammal survey. |
All of the data are important to the development of an accurate environmental baseline and water balance model for the Arctic Project area. These studies would need to be completed in sufficient depth to cover all reasonably foreseeable baseline work that may be requested by the regulatory agencies. The risks that come with insufficient baseline data include delays in the permitting process, poorly constrained pre-mining characterizations, inappropriate trigger levels in permits and inaccurate water balance models that can negatively affect operations and otherwise result in unforeseen and potentially costly circumstances during permitting or mine operations and closure.
20.2 | PERMITTING |
| |
20.2.1 | EXPLORATION PERMITS |
| |
| NovaCopper performs mineral exploration at the Arctic Deposit under State of Alaska and NWAB permits. |
NovaCopper Inc. | 20-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NovaCopper is presently renewing their multi-year hardrock exploration permit issued by the ADNR. The renewal is anticipated by July 2013. NovaCopper is not currently performing mineral exploration activities on the Arctic Project during 2013. Cumulative surface disturbance for exploration activities on the Arctic Project remains less than 5 acres and therefore there are currently no State of Alaska requirements for reclamation bonding for the Arctic Project.
NovaCopper reports that the NWAB Title 9 Conditional Use Permit authorizing exploration and bulk fuel storage expires on December 31, 2014, and the permit for landfill, gravel extraction, and bridge construction permit expires after December 31, 2015. No bonding is required for the borough permits.
NovaCopper has obtained several other permits for camp support operations. These permits include a drinking water permit, a wastewater discharge permit (pending final approval), camp establishment permits, and construction and operation of a Class III Camp Municipal Landfill, all of which are issued by the ADEC. Temporary water use authorization issued by the ADNR, a Title 16 Fish Habitat permit and a wildlife hazing permit issued by the ADF&G.
The following discussion identifies the major permits and approvals that are likely required for the Arctic Project to be developed into an operating mine.
The types of major mine permits required by this project are largely driven by the underlying landownership; regulatory authorities vary depending on land ownership. The Arctic Project area includes patented mining claims (private land under separate ownership by NovaCopper and NANA), State of Alaska land, and NANA land (private land). In addition, federal land would likely be part of any access road between the Dalton Highway and the Arctic Project area. However permits associated with such an access road are being investigated in a separate action by AIDEA as part of their permitting of the AMDIAR and not addressed in this report. A list of likely major mine permits is included in Table 20.3.
Because the Arctic Project is situated at least partially on State of Alaska lands, it will likely be necessary to obtain a Plan of Operation Approval (which includes the Reclamation and Closure Plan) from the ADNR. The ADNR will also require certificates to construct and then operate a dam(s) (tailings and water storage), water use authorizations, an upland mining lease and a mill site lease, as well as several minor permits including those that authorize access to material sites.
The ADEC would require an integrated waste management permit, air permits for construction and then operations, and an Alaska Pollution Discharge Elimination System (APDES) permit for any wastewater discharges to surface waters, and a multi-sector general permit for stormwater discharges. The ADEC would also be required to provide a 401 Certification for the Federal Section 404 permit (Table 20.2).
NovaCopper Inc. | 20-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The ADF&G would require permits for any culverts or bridges that are required to cross fish-bearing streams or for other impacts to fish-bearing streams.
The USACE would require aClean Water Act (CWA) Section 404 permit for dredging and filling activities in “waters of the US,” including jurisdictional wetlands.
The USACE Section 404 permitting action would require the USACE to comply with the NEPA and, for a project of this magnitude, the development of an EIS. The USACE would likely be the lead federal agency for the NEPA process. The NEPA process will require an assessment of direct, indirect and cumulative impacts of the Arctic Project and the identification of project alternatives, and include consultation and coordination with additional federal agencies, such as the US Fish and Wildlife Service (if endangered or threatened species are present) and National Marine Fisheries Service (if essential fish habitat is present), and with the State Historic Preservation Office and Tribal Governments under Section 106 of theHistorical and Cultural Resources Protection Act.
The Arctic Project will have to meet USACE wetlands guidelines to avoid, minimize and mitigate impacts to wetlands and, as part of the Section 404 permitting process, the USACE will require NovaCopper to develop a compensatory wetlands mitigation plan. This will be an in-depth plan for mitigating unavoidable wetlands impacts and should include the input from reclamation and mitigation experts as well as the purchase of wetland “credits” through an in-lieu fee program.
The Arctic Project will also have to obtain approval for a Master Plan from the NWAB. In addition actions will have to be taken to change the borough zoning for the Arctic Project area from Subsistence Conservation to Resource Development.
The overall timeline required for permitting would be largely driven by the time required for the NEPA process, which is triggered by the submission of the 404 permit application. The timeline includes the development and publication of a draft and final EIS and ends with a Record of Decision and an appeal period. In Alaska, the EIS and other State and Federal permitting processes are generally coordinated so that permitting and environmental review occurs in parallel. The NEPA process could last between 1.5 to 3 years, but could potentially be longer.
Table 20.3 Major Mine Permits Required for the Arctic Project
Agency | Authorization |
State of Alaska |
ADNR
| Plan of Operations Approval (including Reclamation and Closure Plan) |
Upland Mining Lease |
Mill Site Lease |
Reclamation Bond |
Certificate of Approval to Construct a Dam |
Certificate of Approval to Operate a Dam |
Water Rights Permit to Appropriate Water |
table continues…
NovaCopper Inc. | 20-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Agency | Authorization |
ADF&G | Title 16 Permits for Fish Habitat (authorize stream crossings) |
ADEC
| APDES Water Discharge Permit |
Alaska Multi-Sector General Permit (MSGP) for Stormwater |
Stormwater Discharge Pollution Prevention Plan (part of MSGP) |
Section 401 Water Quality Certification of the CWA Section 404 Permit |
Integrated Waste Management Permit |
Air Quality Control – Construction Permit |
Air Quality Control – Title V Operating Permit |
Reclamation Bond |
Federal Government |
EPA | Spill Prevention, Control, and Countermeasure (SPCC) Plan (fuel transport and storage) |
USACE | CWA Section 404 Dredge and Fill Permit |
NWAB |
NWAB | Master Plan Approval and rezoning lands from Subsistence Conservation to Resource Extraction |
Note: ”Major” permits define critical permitting path. Additional “minor” permits are also required.
20.3 | SOCIAL OR COMMUNITY CONSIDERATIONS |
The Arctic Project is located approximately 25 miles northeast of the native villages of Shungnak and Kobuk, and 40 miles east-northeast of the native village of Ambler. The population in these villages are 151 in Kobuk (2010 Census), 262 in Shungnak (2010 Census) and 258 in Ambler (2010 US Census). Residents live a largely subsistence lifestyle with incomes supplemented by trapping, guiding, local development projects, government aid and other work in, and outside of, the villages.
The Arctic Project has the potential to significantly improve work opportunities for village residents. NovaCopper is working directly with the villages to employ residents in the ongoing exploration program as geotechnicians, drill helpers, and environmental technicians. NovaCopper and NANA have established a Workforce Development Subcommittee of the Oversight Committee, described below, to assist with developing a local workforce. In addition, NovaCopper has existing contracts with native-affiliated companies (such as NANA Camp Services (NMS) and WHPacific Inc.) that are providing camp catering and environmental services for the project, respectively.
In October 2011, NovaCopper signed an agreement with NANA. In addition to consolidating landholdings in the Ambler District, the agreement has language establishing native hiring preferences and preferential use of NANA subsidiaries for contract work. Furthermore, the agreement formalized an Oversight Committee, with equal representation from NovaCopper and NANA, to regularly review project plans and activities. In addition, a Subsistence Subcommittee has been formed to protect subsistence and the Iñupiaq way of life and a Workforce Development Subcommittee is also in place to address current and future employment needs on the project through the development of training and educational programs that build skill sets for local residents interested in exploration and mining careers. The agreement also includes a scholarship funded annually by NovaCopper that promotes education for youth in the region. NovaCopper meets monthly, during summer months, with the residents of Kobuk, Shungnak and Ambler, the three villages closest to the project area. NovaCopper also meets annually with eight other NANA region villages including Noatak, Kivalina, Kotzebue, Kiana, Deering, Buckland, Selawik and Noorvik, for the purpose of updating residents on project plans and fielding their questions and concerns. NovaCopper has also developed a good working relationship with the NWAB government.
NovaCopper Inc. | 20-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
In general terms, rural Alaska residents are often concerned about potential mining impacts to wildlife and fish for those projects within their traditional use areas NovaCopper appears to have acknowledged these views and concerns and is taking substantive steps to address them during the current exploration stage of the Arctic Project.
Local community concerns will also be formally recognized during the scoping stage at the beginning of the NEPA process. At that time, the lead federal agency (likely the USACE) will hold scoping meetings in rural villages to hear and record the concerns of the local communities so that the more significant of these can be addressed during the development of the EIS. In addition, the USACE would have government-to-government consultations with the Tribal Councils in each of the villages, as part of the NEPA process, to discuss the project and discuss Council concerns.
Characterizing the level of support or opposition to the Arctic Project would be speculative at this time. A poll conducted by Dittman Research for the 2011 NANA Shareholder opinion survey asked if Shareholders supported or opposed road projects on NANA land to assist in economic and potential mineral development. Eighty three percent supported the concept while 15% opposed. Surveys of this sort show a broad support for infrastructure and of mineral development indirectly in the region as long as regional interests are met. Regional engagement by NovaCopper has also encountered a strong desire for the economic benefits that come with mining projects. However, like most mining projects there will likely be some opposition to this project.
20.4 | MINE RECLAMATION AND CLOSURE |
Mine reclamation and closure are largely driven by State of Alaska regulations (11 AAC 86.150, 11 AAC 97.100 -910, and 18 AAC 70) and statutes (Chapter 27.19) that specify that a mine must be reclaimed concurrent with mining operations to the greatest extent possible and then closed in a way that leaves the site stable in terms of erosion and avoids degradation of water quality as a result of ARD or ML on the site. A detailed reclamation and closure plan will be submitted to the agencies for review and approval in the future, during the formal mine permitting process. The approval process for the plan varies somewhat depending on the land status for any particular mine. Owing to the fact that the Arctic Project is likely to have facilities on a combination of private (patented mining claims and native land) and State lands, it is likely that the reclamation plan will be submitted and approved as part of the plan of operations, which is approved by the ADNR. However since the reclamation plan must meet regulations of both ADNR and the ADEC, both agencies will review and approve the Reclamation and Closure Plan. Generalized reclamation and closure strategies are presented in Section 20.5.1.
NovaCopper Inc. | 20-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
20.4.1 | RECLAMATION AND CLOSURE PLAN |
A formal reclamation and closure plan for the Arctic Project will be developed as part of the formal mine permitting process in the future. The following is a general discussion of the reclamation and closure as it applies to the Arctic Project.
If the Arctic Project is developed as an open-pit mine, it will generate approximately 300 Mt of waste rock that will be managed during mining operations and permanently disposed of on the site as part of concurrent reclamation, mine closure and final reclamation. Waste rock will be characterized and a waste rock management plan will be developed and incorporated into the mining operations and final closure strategy. Preliminary acid-base-accounting data obtained from drill core samples indicate that the waste rock and tailings could potentially exhibit ARD/ML. Depending on the geochemical character, all or a portion of, the waste rock may be covered with an engineered soil or geomembrane cover at closure to minimize water and oxygen infiltration and oxidation of the waste rock and/or tailings. Under the current mine plan the waste rock with the potential to generate ARD/ML will be co-disposed with the tailings and managed under a wet cover to minimize oxidation
The reclamation and closure plan will also address water management, including the monitoring of surface and groundwater at the site that will be required after mine closure.
The mineralized material will be processed in a mill at site and the tailings remaining after mineral extraction will report to the tailings waste stream. Under the present mine plan, the tailings will be conveyed by pipe as a slurry to a lined tailings facility. Closure for the tailings facility will be a “wet” closure, where water is managed in order to keep the tailings and waste rock submerged in perpetuity to minimize the potential of ARD/ML. Long term water management may be required for the wet closure scenario. The reclamation and closure plan will address the closure of the tailings facility in more detail.
Typically, mine buildings and other mine infrastructure are removed at mine closure, and disturbed or otherwise-impacted land is re-graded, covered with growth media and re-vegetated. This would be the general approach to closure for the Arctic Project, except that State of Alaska regulations allow some flexibility to accommodate the preferences of the surface land owner and the intended post-mining land use. In this case, the mine facilities may be located on a combination of private and State lands. It would be permissible, under current regulations, to leave certain buildings or other facilities in place at closure if the private land owners (patented claim owners and/or NANA) prefer. Those details will be included in the reclamation and closure plan that will be submitted during the formal mine permitting process. State of Alaska agencies require a letter of consent from the surface land owner that acknowledges that the intended mining use and closure plans are acceptable to them. The letter is required in advance of any mine construction activities.
NovaCopper Inc. | 20-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The reclamation and closure plan will also include many other important details including growth media inventories, water management plans and post closure monitoring plans that will measure the efficacy of the mine reclamation activities with regard to protecting the environment for a significant period following mine reclamation and closure, likely 30 years.
A number of studies will be required to develop a more detailed reclamation and closure plan, and support mine permitting and mine design, prior to mine development.
A site-wide surface water and constituent load balance will be required to predict water shortfalls or surpluses during operations and at closure. The results of the study will drive the need for any water use authorizations, surface water discharge permits and establish any need for water treatment capabilities for the Arctic Project.
Groundwater studies will be required to provide a range of important information including the flood rate of the open pit following closure. In addition, it will be necessary develop a model to predict quality of the pit lake water after closure in order to assess the possible need to treat that water if modeling predicts that the lake will eventually fill and discharge water to the environment.
Acid-base-accounting study work will need to be performed in order to characterize the geochemistry of the tailings and the waste rock. The results of these studies will be used to develop waste rock and tailings management plans for operations and also to support the closure strategy as it applies to the tailings and waste rock storage facilities.
During operations additional studies using test plots on the site may be performed that will help develop the final details for tailings and waste rock cover designs, re-vegetation, and water management of the site during closure and reclamation.
Reclamation and closure costs will be developed as more detailed engineering and study work is completed that is sufficient to support a detailed reclamation and closure plan. Current financial assurance amounts, which are reflective of closure and reclamation costs, for Alaska’s six operating metal mines range from $6 million to $305 million. Of those, only two mines are open pit mines (Red Dog and Fort Knox mines) and the financial assurance amounts for those are $68 million and $305 million, respectively. The Red Dog financial assurance amount is largely driven by the need for perpetual water treatment which accounts for approximately $255 million of the total financial assurance amount. For this PEA, Tetra Tech estimates that the closure costs for the Arctic Project will be between $30 million and $60 million, exclusive of any potential need for long-term water treatment following mine closure. This estimate is based on: 1) comparisons with other mines that share similarities with the Arctic Project, and 2) other industry experience.
20.4.2 | RECLAMATION AND CLOSURE FINANCIAL ASSURANCE |
There are two State of Alaska agencies that require financial assurance in conjunction with approval and issuance of large mine permits. The ADNR, under authority of Alaska Statute 27.19, requires a reclamation and closure plan be submitted prior to mine development and requires financial assurance to assure reclamation of the site, typically prior to construction. The ADEC requires financial assurance both during and after operations, and to cover short and long-term water treatment if necessary, as well as reclamation and closure costs, monitoring, and maintenance needs. The financial assurance must also include the property holding costs for a one-year period. The financial assurance amount is calculated through the process of reviewing and approving the Arctic Project reclamation and closure plan during the permitting process. Both State agencies also have requirements that any private land owners (patented mining claim owners and NANA) provide their concurrence with the use of their lands for mining purposes and that the reclamation and closure plan for the mine is consistent with their intended post-mining land use.
NovaCopper Inc. | 20-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NovaCopper may satisfy the State of Alaska financial assurance requirement by providing any of the following: (1) a surety bond, (2) a letter of credit, (3) a certificate of deposit, (4) a corporate guarantee that meets the financial tests set in regulation by the ADNR commissioner, (5) payments and deposits into the trust fund established in AS 37.14.800, or (6) any other form of financial assurance that meets the financial test or other conditions set in regulation by the ADNR commissioner. The adequacy of the reclamation and closure plan, and the amount of the financial assurance, are reviewed by the State agencies at a minimum of every five years and may be reviewed whenever there is a significant change to the mine operations, or other costs that could affect the reclamation and closure plan costs.
NovaCopper Inc. | 20-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
21.0 | CAPITALANDOPERATINGCOSTS |
Tetra Tech has developed a capital cost estimate (CAPEX) and operating cost estimate (OPEX) for the Arctic Project. A summary of both the CAPEX and OPEX is provided in Table 21.1, and is discussed in greater detail in the subsections that follow. The CAPEX and OPEX provide the basis for the economic analysis in Section 22.0.
Table 21.1 Summary of Capital and Operating Costs
Cost Type | Total ($ million) | Unit Cost ($/t milled) | Estimate Accuracy Range (%) |
Total Capital Costs | 717.7 | - | ±35 |
Total Sustaining Capital for LOM | 164.4 | - | ±35 |
Total Operating Costs* | - | 63.93 | ±35 |
Note:*Excluding pre-production cost and including the road toll cost for the proposed AMDIAR.
21.2 | CAPITAL COST ESTIMATE |
| |
21.2.1 | INTRODUCTION |
| |
| The total estimated CAPEX for the design, construction, installation and commissioning of the Arctic Project is $717.7 million. Closure costs are estimated to be $81.6 million and are included in the financial analysis. |
| |
21.2.2 | CAPITAL COST SUMMARY |
| |
| The total initial and sustaining capital cost summary is shown in Table 21.2 and illustrates the costs separated out by the work breakdown structure (WBS) area. |
| |
21.2.3 | TOTAL SUSTAINING CAPITAL COSTS |
| |
| The total sustaining capital costs of $164.4 million for the 12 year LOM including equipment, tailings and other items are summarized in Table 21.3. |
NovaCopper Inc. | 21-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 21.2 CAPEX Summary
Item | Total Cost ($ million) |
Initial Capital Estimate | |
10 | Overall Site | 82.5 |
20 | Open Pit Mining | 119.7 |
35 | Mineralized Material Handling | 17.4 |
40 | Process Plant | 122.2 |
50 | Tailings and Water Management | 21.0 |
70 | On Site Infrastructure | 49.1 |
75 | Airstrip | 14.2 |
86 | External Access Roads | 27.2 |
87 | Temporary Services | 23.1 |
Subtotal | 476.4 |
90 | Indirect Costs | 130.9 |
98 | Owner’s Costs | 18.6 |
99 | Contingency | 91.9 |
Initial Development Capital | 717.7 |
Note: Total made not add up due to rounding.
Table 21.3 Summary of Total Sustainable Capital Costs for LOM
Item | Total Cost ($ million) |
Mining Equipment | 45.6 |
Tailings | 112.8 |
Other Equipment | 6.0 |
Total Sustaining Capital | 164.4 |
21.2.4 | PURPOSE AND CLASS OF ESTIMATE |
The purpose of this CAPEX is to estimate the capital cost of the Project contemplated in the scope of work included in the NI 43-101 technical report and PEA.
This estimate has been prepared in accordance with the recommended practices of the AACE International. In accordance with the AACE’s International Estimate Classification System, this cost estimate meets or exceeds the specifications for a Class 5 Estimate and has a deemed accuracy of ±35%.
21.2.5 | ESTIMATE BASE DATE, EXCHANGE RATE, AND VALIDITY PERIOD |
Tetra Tech prepared this estimate with a base date of Q2 2013. Quotations for major pieces of equipment used in this estimate were obtained in Q2 2013 and have a 90-day period of validity. Costs for all other equipment and materials were obtained from similar projects and are not based on definitive quotations.
NovaCopper Inc. | 21-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The CAPEX uses US dollars as the base currency. Foreign exchange rates are noted and applied as required (Table 21.4). All costs presented in this section are in US dollars unless otherwise stated.
Table 21.4 Foreign Exchange Rate Summary
Base Currency | Foreign Currency |
US$1.00 | Cdn$1.00 |
US$1.00 | AUD$1.00 |
US$1.00 | €0.81 |
Duties and taxes have not been included in this CAPEX.
The International System of Units (SI) has been used in the preparation of this estimate.
21.2.6 | CONTRIBUTORS TO THE ESTIMATE |
Tetra Tech developed the estimate in conjunction with:
| • | EBA (a Tetra Tech company): access road and airport |
| • | NovaCopper: Owner’s costs. |
The estimate consists of four main parts:
| • | direct costs |
| • | indirect costs |
| • | contingency |
| • | Owner’s costs. |
AACE defines direct costs as:
“…costs of completing work that are directly attributable to its performance and are necessary for its completion. In construction, (it is considered to be) the cost of installed equipment, material, labor and supervision directly or immediately involved in the physical construction of the permanent facility.”
Examples of direct costs are mining equipment, process equipment, mills and permanent buildings.
NovaCopper Inc. | 21-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The largest components included in the direct costs are the mining pre-production costs ($62.5 million), the mining equipment ($54.6 million), the mineralized material handling ($17.4 million) and the processing costs (mill building: $59.9 million; grinding/flotation/refining: $45.7 million; concentrate handling: $12.3 million). Tailings disposal and reclaim cost total $21.0 million. The total estimated cost for on-site infrastructure is $49.1 million and consists of $22.1 million for ancillary buildings, $18.8 million for site services and utilities and $8.1 million for the plant mobile fleet. The largest components of the off-site infrastructure include the airstrip ($14.2 million) and external access road ($27.2 million).
The construction camp ($12.6 million) has been included in direct costs and it will be refurbished to become part of the permanent operations camp. The full WBS for the Arctic Project and the labour summary can be found in Appendix E.
The total direct costs for the Arctic Project are $476.3 million.
AACE defines indirect costs as:
“…costs not directly attributable to the completion of an activity, which are typically allocated or spread across all activities on a predetermined basis. In construction, (field) indirects are costs which do not become a final part of the installation, but which are required for the orderly completion of the installation and may include, but are not limited to, field administration, direct supervision, capital tools, startup costs, contractor's fees, insurance, taxes, etc.”
Examples of indirect costs in this estimate are construction support equipment including all contractor indirects ($52.0 million), all temporary facilities or equipment to support construction, travel costs (travel and labour costs), spares ($3.9 million), freight and logistics ($21.8 million), initial fills ($2.2 million), commissioning ($1.1 million) and engineering, procurement and construction management (EPCM) ($46.8 million).
The total indirect costs for the Arctic Project are $130.9 million.
Owner’s costs are costs borne by the owner in support and execution of the Arctic Project.
The project execution strategy involves an EPCM organization supervising one or more general contractors. The allowance for Owner’s costs has been provided by Tetra Tech and confirmed by NovaCopper. Some of the items include home office staffing, home office travel, home office general expenses, field staffing, field travel, general field expenses, and Owner’s contingency.
The Owner’s costs for the Arctic Project are $18.6 million.
NovaCopper Inc. | 21-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
When estimating the cost for a project, there is always uncertainty as to the precise content of all items in the estimate, how work will be performed, what work conditions will be like when the project is executed, and so on. These uncertainties are risks to a project. The estimator is often aware of the costs to these risks, and based on experience, can even estimate their probable costs. The estimated costs are referred to by cost estimators as “cost contingency”.
The level of engineering effort and risk has been assessed for each area and a contingency allowance has been assigned for each activity. The contingency ranges from a high of 25% for the airstrip, mine access road and tailings and waste dump areas to a low of 5 % for construction indirects and EPCM. Concrete and steel have been assigned a cost contingency of 15%. Owners cost have been assigned a contingency of 10%.
The total contingency for the Project is $91.9 million. This amount represents 19.3% of the direct costs.
The following are not included in the CAPEX:
| • | force majeure |
| • | schedule delays such as those caused by: |
| - | major scope changes |
| - | unidentified ground conditions |
| - | labour disputes |
| - | environmental permitting activities |
| - | abnormally adverse weather conditions |
| • | receipt of information beyond the control of the EPCM contractors |
| • | cost of financing (including interests incurred during construction) |
| • | duties |
| • | taxes |
| • | schedule acceleration costs. |
21.3.6 | COSTS INCURRED PRIOR TO RELEASE OF DETAIL ENGINEERING AND CONSTRUCTIONASSUMPTIONS |
The following assumptions have been made in the preparation of this estimate:
| • | All material and installation subcontracts were competitively tendered on an open shop, lump sum basis. |
| • | Site work is continuous and is not constrained by the Owner or others. |
NovaCopper Inc. | 21-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | Skilled tradespersons, supervisors, and contractors are readily available. |
| • | The geotechnical nature of the site is assumed to be sound, uniform, and able to support the intended structures and activities. Adverse or unusual geotechnical conditions requiring piles or soil densification have not been allowed for in this estimate. |
21.4 | MINING CAPITAL COST ESTIMATE |
The mining CAPEX includes investment and operating costs associated with the construction period and considers the following items:
| • | pre-production costs |
| • | initial investment, replacement spare components and contingencies associated with the mine equipment fleet |
| • | other investment such as dispatch, training sets, etc. |
A summary of pre-production mining costs is presented in Table 21.5.
Table 21.5 Summary of Mining Costs
Pre-production | Costs ($ million) |
Mining Operations | 62.5 |
Mining Equipment | 54.6 |
Facilities | 2.0 |
Dewatering | 0.6 |
Total Pre-production | 119.7 |
PRE-PRODUCTION COST
Pre-production cost includes the mining cost associated with the pre-stripping before the start-up of the processing plants. The estimated pre-production tonnage is 16 Mt and it is expected to take one year to remove this material and expose sufficient mineral to initiate production. Details of the pre-production costs are shown in Table 21.6.
NovaCopper Inc. | 21-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 21.6 Mining Pre-production Unit Costs
Pre-production | Costs ($ million) | Costs ($/t mined) |
Loading | 2.54 | 0.16 |
Hauling | 15.85 | 0.99 |
Drilling | 2.64 | 0.16 |
Blasting | 10.27 | 0.64 |
Ancillary | 1.19 | 0.07 |
Support | 5.92 | 0.37 |
Labour | 22.28 | 1.39 |
Dewatering | 0.80 | 0.05 |
Other | 0.97 | 0.06 |
Total | 62.45 | 3.90 |
MINING FLEET INVESTMENT
The mining fleet investment has been developed in accordance with the mine development schedule and considered the useful life of each type of equipment. The full purchase prices of the mining equipment were obtained from estimations prepared by Tetra Tech, based on costs from quotations from equipment vendors and “Mine and Mill Equipment Costs an Estimator’s Guide 2010 and 2011” escalated to 2013 figures. The prices included freight to the site and commissioning. Table 21.7 and Table 21.8 outline the details of initial and sustaining capital mine equipment purchases.
Table 21.7 Initial Mining Equipment Fleet
Equipment | Number of Units | Total Capital Cost ($) |
Hydraulic Shovels 14.4 yd3 | 2 | 7,249,032 |
Haul Truck (100 ton) | 16 | 24,045,136 |
Articulated Truck (43.5 ton) | 2 | 1,510,587 |
Diesel Drill (4.5 to 8.5' in) | 4 | 5,060,000 |
Secondary Drill (4.5 to 5.5 in) | 1 | 806,910 |
Wheel Loader 15 yd3 | 1 | 2,171,736 |
Wheel Loader 9 yd3 | 1 | 765,827 |
Track Dozer (17.3 ft) | 4 | 5,919,850 |
Wheel Dozer (15.2 ft) | 1 | 1,175,949 |
Grader (16 ft) | 2 | 1,708,373 |
Water Truck (10,000 gal) | 1 | 676,288 |
Service Wheel Loader | 1 | 381,430 |
Vibratory Compactor | 1 | 216,637 |
Integrated Tool Carrier | 1 | 178,499 |
Excavator | 3 | 1,010,312 |
table continues…
NovaCopper Inc. | 21-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Equipment | Number of Units | Total Capital Cost ($) |
Flatbed Truck | 1 | 132,413 |
Fuel/Lube Truck | 2 | 1,183,191 |
Mechanics Service Truck | 1 | 108,119 |
Welder Truck | 1 | 81,599 |
Tire Service Truck | 1 | 403,917 |
Snow Plow/Sanding Truck | 1 | 432,477 |
Pick-up Truck | 8 | 399,837 |
Truck Mounted Hydraulic Crane | 1 | 363,426 |
Rough Terrain Forklift | 1 | 134,639 |
Shop Forklift | 1 | 73,439 |
Light Plant/Towers | 8 | 114,239 |
Mobile Radios | 50 | 51,000 |
Safety Equipment | 1 | 81,599 |
Engineering/Geology Equipment (computers, software, licenses) | 1 | 165,239 |
Maintenance Management System | 1 | 5,610 |
Explosives Plant (facilities and buildings) | 1 | 1,200,000 |
Surveying | 1 | 50,000 |
Total | | 57,857,309 |
Note: Rounding as required by reporting guidelines may result in apparent summation differences.
Table 21.8 Sustaining Capital Mining Equipment Fleet
Equipment | Number of Units | Total Capital Cost ($) |
Hydraulic Shovels 14.4 yd3 | 2 | 7,249,032 |
Haul Truck (100 ton) | 8 | 12,022,568 |
Articulated Truck (43.5 ton) | 2 | 1,510,587 |
Diesel Drill (4.5 to 8.5 in) | 3 | 3,795,000 |
Secondary Drill (4.5 to 5.5 in) | 1 | 806,910 |
Wheel Loader 15 yd3 | 1 | 2,171,736 |
Wheel Loader 9 yd3 | 1 | 765,827 |
Track Dozer (17.3 ft) | 4 | 5,919,850 |
Wheel Dozer (15.2 ft) | 3 | 3,527,846 |
Grader (16 ft) | 4 | 3,416,746 |
Water Truck (10,000 gal) | 0 | 0 |
Service Wheel Loader | 1 | 381,430 |
Vibratory Compactor | 1 | 216,637 |
Integrated Tool Carrier | 0 | 0 |
Excavator | 3 | 1,010,312 |
Flatbed Truck | 0 | 0 |
Fuel/Lube Truck | 0 | 0 |
table continues…
NovaCopper Inc. | 21-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Equipment | Number of Units | Total Capital Cost ($) |
Mechanics Service Truck | 1 | 108,119 |
Welder Truck | 1 | 81,599 |
Tire Service Truck | 0 | 0 |
Snow Plow/Sanding Truck | 0 | 0 |
Pick-up Truck | 22 | 1,099,551 |
Truck Mounted Hydraulic Crane | 1 | 363,426 |
Rough Terrain Forklift | 1 | 134,639 |
Shop Forklift | 1 | 73,439 |
Light Plant/Towers | 16 | 228,478 |
Mobile Radios | 131 | 133,619 |
Safety Equipment | 2 | 163,199 |
Engineering/Geology Equipment (computers, software, licenses) | 2 | 330,477 |
Maintenance Management System | 2 | 11,220 |
Explosives Plant (facilities and buildings) | 0 | 0 |
Surveying | 1 | 50,000 |
Total | | 45,572,248 |
Note: Rounding as required by reporting guidelines may result in apparent summation differences.
21.5 | OPERATING COST ESTIMATE |
| |
21.5.1 | SUMMARY |
The total LOM operating cost for the proposed mine is estimated at $63.93/t milled on average. The estimate includes mining, processing, tailing management, G&A and surface service operating costs.
A total of 35.68 Mt of mineralization material from the open pit mine is expected to be processed during LOM based on the proposed mining schedule. The nominal annual process rate is approximately 3,650,000 t/a (LOM average annual process rate is approximately 2,973,435 t/a) or 10,000 t/d (LOM daily average rate is 8,146 t/d) at 365 d/a. The unit cost is estimated based on the LOM average mill feed rate. The accuracy for the estimate is expected to be within a range of ±35%. The breakdown operating cost estimates are presented in Table 21.9. Figure 21.1 shows the cost breakdown at the LOM average throughput.
NovaCopper Inc. | 21-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 21.9 Overall Operating Cost Estimate
Area | LOM Average Unit Operating Cost ($/t milled) |
Mining* | 28.40 |
Processing** | 19.86 |
G&A | 8.92 |
Surface Services | 3.48 |
Road Toll | 3.27 |
Total | 63.93 |
Notes:*Excluding preproduction cost.
**Including tailings management operation cost.
Figure 21.1 LOM Average Operating Cost Distribution
21.5.2 | MINING OPERATING COST ESTIMATE |
Tetra Tech prepared the operating cost estimate based on price information for consumables, maintenance and labour costs from other similar projects in the area.
RELEVANT CONSUMABLE PRICES
Table 21.10 shows consumable pricing used in the calculation of equipment operating costs.
Table 21.10 Relevant Consumables Prices
Description | Unit | Price |
Fuel | $/L | 1.182 |
Lube | $/L | 1.725 |
Emulsion | $/kg | 1.826 |
ANFO | $/kg | 1.704 |
NovaCopper Inc. | 21-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
LABOUR
The mine indirect manpower includes personnel allocated to mine management, mine operations, maintenance services, technical services and mine geology.
Labour costs were calculated using the yearly cost per labour category equal to an average of salaries from two comparatively similar Alaskan mining operations.
BLASTING SERVICE
The mine will contract out this service including the supply of mix trucks and the trained personnel who will carry out the delivery of the explosive mix to the drill hole and the blasting operation. The fixed cost of this service is estimated at $0.05/t mined not including consumables.
MINING OPERATING COST SUMMARY
The operating cost of the total mine movement was calculated based on all information described in this section. Table 21.11 summarizes the mining operating costs per activity for the production period and displays those same costs as unit costs in $/t mined.
Table 21.11 Mining LOM and Unit Operating Cost Summary
Production | LOM Cost ($ million) | Unit Cost ($/t mined) |
Loading | 51 | 0.16 |
Hauling | 212 | 0.67 |
Drilling | 48 | 0.15 |
Blasting | 197 | 0.62 |
Ancillary | 16 | 0.05 |
Labour | 370 | 1.16 |
Support | 82 | 0.26 |
Dewatering | 16 | 0.05 |
Other | 22 | 0.07 |
Total Costs | 1,013 | 3.18 |
21.5.3 | PROCESSING OPERATING COSTS |
The estimated LOM average process operating cost is 19.86$ /t milled or $59.05 million per year. The estimate is based on a total mill feed of 35.68 Mt (LOM) or an average annual process rate of 2,973,435 t/a or an average daily process rate of 8,146 t/d and 365 d/a.
A summary of the plant operation costs is shown in Table 21.12.
NovaCopper Inc. | 21-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Table 21.12 Summary of Process Operating Cost
Description | Labour Force | Annual Cost ($) | Unit Cost ($/t milled) |
Labour Force | | | |
Operating Staff | 14 | 2,013,000 | 0.68 |
Operating Labour | 52 | 4,073,000 | 1.37 |
Maintenance | 63 | 5,611,000 | 1.89 |
Metallurgy Lab and Quality Control | 13 | 1,230,000 | 0.41 |
Subtotal Labour Force | 142 | 12,927,000 | 4.35 |
Supplies |
Maintenance Supplies | - | 17,528,000 | 5.89 |
Operating Supplies | - | 2,106,000 | 0.71 |
Subtotal Supplies | - | 19,634,000 | 6.60 |
Power Supply (Mill and Tailings) | - | 26,485,000 | 8.91 |
Subtotal Power | - | 26,485,000 | 8.91 |
Total (Process) | 142 | 59,046,000 | 19.86 |
The estimated labour force cost is $4.35/t milled. A total of 142 people are estimated for the process operation, including 14 staff for management and professional services, 52 operators for operating, 63 personnel for maintenance and 13 personnel for metallurgical lab and assaying. The estimate is based on 12 hours per shift, 24 h/d, and 365 d/a.
The operating cost for the operating supplies include mill and crusher liners, mill grinding media and reagents. Reagent consumptions are estimated from the laboratory test results and comparable operations. The consumable metal costs and reagent costs are from the current budget prices from potential suppliers or Tetra Tech’s database.
The maintenance supplies are estimated at $5.89/t milled, operating supplies are estimated at $0.71/t milled and the unit power cost is estimated to be $8.91/t milled. The power cost is estimated based on the average power requirement of 82.25 MWh/a and a unit electric energy price of $0.322/kWh for the electric power generated on site.
All operating cost estimates exclude taxes, permitting costs, or other government imposed costs, unless otherwise noted. The estimate includes:
| • | labour force, including supervision, operation, and maintenance; salary/wage levels are based on average labour rates for similar operations; a benefit burden rate of 41% including holiday and vacation payment, pension plan, various other benefits, and tool allowance |
| • | power supply from the electricity generating on site |
| • | crusher/mill liner and mill grinding media consumptions estimated from the BWi and the Tetra Tech’s in-house database |
NovaCopper Inc. | 21-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| • | maintenance supply costs, including building maintenance costs, based on approximately 7% of major equipment capital costs |
| • | laboratory supplies, service vehicles consumables and other costs based on Tetra Tech’s in-house database and industry experience |
| • | reagent costs based on the consumption rates from the test results and quoted budget prices or Tetra Tech’s in-house database. |
21.5.4 | GENERAL AND ADMINISTRATIVE COSTS AND SURFACE SERVICES COSTS |
The LOM average G&A costs are estimated to be $8.92/t milled. Tetra Tech and NovaCopper developed these costs which include:
| • | labour cost for administrative personnel |
| • | services expenses related to general administration, human resources, safety and security |
| • | allowances for insurance and licenses |
| • | costs for camp and personnel transport |
| • | sustainability, including environment, community liaison and engineering consulting. |
A summary of the G&A costs are provided in Table 21.13.
Table 21.13 G&A Operating Costs
| Labour Force | Total Cost ($/a) | Unit Cost ($/t milled) |
G&A Labour Force | | | |
G&A | 36 | 4,091,000 | 1.38 |
G&A Hourly Personnel | 14 | 1,398,000 | 0.47 |
Subtotal G&A Labour Force | 50 | 5,489,000 | 1.85 |
G&A Expense |
General Office Expense | - | 250,000 | 0.08 |
Computer Supplies including Software | - | 100,000 | 0.03 |
Communications | - | 500,000 | 0.17 |
Travel | - | 150,000 | 0.05 |
Audit | - | 100,000 | 0.03 |
Consulting/External Assays | - | 200,000 | 0.07 |
Head Office Allowance: Marketing | - | 200,000 | 0.07 |
Environmental | - | 600,000 | 0.20 |
Insurance | - | 1,500,000 | 0.50 |
Regional Taxes and Licenses Allowance | - | 300,000 | 0.10 |
Legal Services | - | 100,000 | 0.03 |
Warehouse | - | 200,000 | 0.07 |
table continues…
NovaCopper Inc. | 21-13 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Labour Force | Total Cost ($/a) | Unit Cost ($/t milled) |
Entertainment/Membership | - | 50,000 | 0.02 |
Recruiting | - | 100,000 | 0.03 |
Medicals and First Aid | - | 100,000 | 0.03 |
Relocation Expense | - | 50,000 | 0.02 |
Training/Safety | - | 200,000 | 0.07 |
Accommodation/Camp Cost | - | 7,745,000 | 2.61 |
Crew Transportation (flight and bus) | | 7,376,000 | 2.48 |
Liaison Committee/Sustainability | - | 500,000 | 0.17 |
Small Vehicles | - | 200,000 | 0.07 |
Others | - | 500,000 | 0.17 |
Subtotal G&A Expense | - | 21,021,000 | 7.07 |
Total | 50 | 26,510,000 | 8.92 |
The surface service costs are estimated at $3.48/t milled and are detailed in Table 21.14. The costs include:
| • | labour costs for surface service personnel and maintenance workshop |
| • | portable water and waste management |
| • | general maintenance including yards, roads, fences, and building maintenance |
| • | electrical power for site services, including lighting |
| • | building heating |
| • | avalanche control |
| • | airport maintenance |
| • | water treatment |
| • | off-site operation expense including office heating and electricity. |
Table 21.14 Surface Services Operating Costs
Surface Service | Labour Force | Total Cost ($/a) | Unit Cost ($/t milled) |
Surface Service Personnel | 29 | 2,355,000 | 0.79 |
Potable Water and Waste Management | - | 230,000 | 0.08 |
Water Treatment Plant | - | 1,672,000 | 0.56 |
General Supplies | - | 200,000 | 0.07 |
Building Maintenance | - | 320,000 | 0.11 |
Building Heating – Mine Site | - | 200,000 | 0.07 |
Electrical Power – Excluding WTPs | - | 2,821,000 | 0.95 |
Road Maintenance | - | 690,000 | 0.23 |
table continues…
NovaCopper Inc. | 21-14 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Surface Service | Labour | Total Cost | Unit Cost |
Avalanche Control | - | 350,000 | 0.12 |
Airport Maintenance | - | 400,000 | 0.13 |
Others – Mobile Equipment | - | 300,000 | 0.10 |
Off-Site Operation Expense | - | 800,000 | 0.27 |
Total | 29 | 10,338,000 | 3.48 |
21.5.5 | TAILINGS STORAGE FACILITY COST |
The LOM operating costs for the tailings pond construction, including lining, are estimated to be $112.8 million. The costs for tailings delivery from the plant to the TSF and reclaim water pumping are included into the process operating costs.
Tetra Tech has not estimated the road toll cost that NovaCopper will pay to use the AMDIAR proposed to be built by the Government of Alaska. Since this cost is determined by confidential negotiations between NovaCopper and the AIDEA, a State-owned private corporation, Tetra Tech has relied on NovaCopper management to provide the road toll cost.
There is currently no developed surface access to the Arctic Project area. Access to the Arctic Project is proposed to be via a road approximately 340 km (211 miles) long, extending west from the Dalton Highway where it would connect with the proposed Arctic Project area. Although the capital costs of the road are not yet known, NovaCopper has been in discussions with AIDEA. The working assumption of this PEA study is that AIDEA would arrange financing in the form of a public-private partnership to construct and arrange for the construction and maintenance of the access road. AIDEA would charge a toll to multiple mining and industrial users (including NovaCopper’s Arctic Project) in order to pay back the costs of financing the AMDIAR. This model is very similar to what AIDEA undertook when the DeLong Mountain Transportation System (also known as the Red Dog Mine Road and Port facilities) were constructed in the 1980s. The amount paid in tolls by any user will be affected by the cost of the road, its financing structure, and the number of mines that would use the AMDIAR to ship concentrates to a port in Alaska. For the purposes of this PEA study, it has been assumed that a toll would be based on a $150 million 30-year bond at a 5% interest rate, which would result in the Arctic Project paying approximately $9.7 million each year for its 12-year mine life. The toll payments are assumed in the PEA to commence when the Arctic Project has reached commercial production.
NovaCopper Inc. | 21-15 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
A PEA should not be considered to be a prefeasibility or feasibility study, as the economics and technical viability of the Arctic Project have not been demonstrated at this time. The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Furthermore, there is no certainty that the conclusions or results as reported in the PEA will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.
Tetra Tech prepared an economic evaluation of the Arctic Project based on a pre-tax financial model. The NPV was estimated at the beginning of the two-year construction period.
As of May 30, 2013, the long-term metal price assumptions used in the economic analysis are as follows:
| • | copper: $2.90/lb |
| • | lead: $0.90/lb |
| • | zinc: $0.85/lb |
| • | gold: $1,300.00/oz |
| • | silver: $22.70/oz. |
The pre-tax financial results are:
| • | 22.8% IRR |
| • | 4.6-year payback on the $717.7 million initial capital costs |
| • | $927.7 million NPV at an 8% discount rate. |
NovaCopper engaged the Canadian firm Ernst & Young LLP (EY) in Vancouver, BC to prepare tax calculations for use in the post-tax economic evaluation of the Arctic Project with the inclusion of US Federal and Alaska State income taxes, and the Alaska Mining License tax (Section 22.4).
The following post-tax financial results were calculated:
| • | 17.9% IRR |
| • | 5.0-year payback on the $717.7 million initial capital costs |
| • | $537.2 million NPV at an 8% discount rate. |
NovaCopper Inc. | 22-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Sensitivity analyses were conducted to analyze the sensitivity of the Arctic Project merit measures (NPV, IRR and payback periods) to the main inputs.
22.1 | PRE-TAXMODEL |
| |
22.1.1 | MINE/METALPRODUCTION INFINANCIALMODEL |
| The life-of-project average material tonnages, grades and metal production are shown in Table 22.1. |
| |
| Table 22.1Mine/Metal Production from the Arctic Mine |
Description | Value |
Total Tonnes to Mill ('000) | 35,681 |
Average Annual Tonnes to Mill ('000) | 2,973 |
Total Waste Tonnes Mined ('000) | 299,354 |
Stripping Ratio (LOM) | 8.39 |
Stripping Ratio (excluding pre-stripping) | 7.94 |
LOM (years) | 12 |
Average Head Grade |
Copper (%) | 2.28 |
Lead (%) | 0.53 |
Zinc (%) | 3.13 |
Gold (g/t) | 0.50 |
Silver (g/t) | 36.91 |
Total Production |
|
Copper ('000'lb) | 1,560,829 |
Lead ('000'lb) | 309,006 |
Zinc ('000'lb) | 2,134,509 |
Gold ('000'oz) | 369 |
Silver ('000'oz) | 34,023 |
Average Annual Production |
Copper ('000'lb) | 130,069 |
Lead ('000'lb) | 25,751 |
Zinc ('000'lb) | 177,876 |
Gold ('000'oz) | 31 |
Silver ('000'oz) | 2,835 |
22.1.2 | BASIS OFFINANCIALEVALUATION |
The production schedule has been incorporated into the 100% equity pre-tax financial model to develop annual recovered metal production from the relationships of tonnage processed, head grades, and recoveries.
NovaCopper Inc. | 22-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Payable metal values were calculated using base case metal prices. Net invoice value was calculated each year by subtracting the applicable refining and smelting charges from the payable metal value. At-mine revenues are then estimated by subtracting transportation and insurance costs. Annual operating costs for mining, processing, site services, G&A and others were deducted from the revenues to derive the annual operating cash flows.
Initial and sustaining capital costs as well as working capital have been incorporated on a year-by-year basis over the LOM. Mine reclamation costs are also applied to the capital expenditure. Capital expenditures are then deducted from the operating cash flow to determine the net cash flow before taxes.
Initial capital expenditures include costs accumulated prior to first production of concentrates and sustaining capital includes expenditures for mining and processing additions, replacement of equipment, and tailings embankment construction.
The pre-production construction period is assumed to be two years. The NPV of the Project was calculated at the beginning of this two-year construction period.
Working capital is assumed to be three months of the annual on-site operating cost and fluctuates from year to year based on the annual operating cost. The working capital is recovered at the end of the LOM.
Tetra Tech has not estimated the road toll cost that NovaCopper will pay to use the AMDIAR proposed to be built by the Government of Alaska. Since this cost is determined by confidential negotiations between NovaCopper and the AIDEA, a State-owned private corporation, Tetra Tech has relied on NovaCopper management to provide the road toll cost. For the purposes of this PEA study, it has been assumed that a toll would be paid based on a $150 million 30-year bond at a 5% interest rate, which would result in the Arctic Project paying approximately $9.7 million each year for its 12-year mine life. The toll payments are assumed in the PEA to commence when the Arctic Project has reached commercial production. Based on these assumptions, the total LOM road toll cost paid by NovaCopper cost is $116.4 million which has been applied in the economic analysis as an annual operating cost
Initial and sustaining capital costs were estimated at $717.7 million and $164.4 million, respectively. Mine closure and reclamation costs were estimated at $81.6 million and will be funded by annual payments throughout the mine life.
The undiscounted annual net cash flow (NCF) and cumulative net cash flow (CNCF) are illustrated in Figure 22.1.
NovaCopper Inc. | 22-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 22.1 Pre-tax Undiscounted Annual and Cumulative NCF
22.2 | SUMMARY OFFINANCIALRESULTS |
The pre-tax financial model was established on a 100% equity basis, excluding debt financing, and loan interest charges. In addition to the base case, Tetra Tech evaluated four alternative cases by changing the copper price only and holding the rest of parameters constant. The pre-tax financial results for the base case and the alternative cases are presented in Table 22.2.
Table 22.2 Summary of Pre-tax Financial Results
Description | Base Case | Alternate Case 1 | Alternate Case 2 | Alternate Case 3 | Alternate Case 4 |
Copper Price ($/lb) | 2.90 | 2.50 | 2.75 | 3.25 | 3.50 |
Lead Price ($/lb) | 0.90 | 0.90 | 0.90 | 0.90 | 0.90 |
Zinc Price ($/lb) | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 |
Gold Price ($/oz) | 1,300.00 | 1,300.00 | 1,300.00 | 1,300.00 | 1,300.00 |
Silver Price ($/oz) | 22.70 | 22.70 | 22.70 | 22.70 | 22.70 |
Recovered Metal Value ($ million) | 7,870.9 | 7,246.5 | 7,636.8 | 8,417.2 | 8,807.4 |
Off Site Costs and Deductions ($ million) | 2,169.7 | 2,138.7 | 2,158.1 | 2,196.8 | 2,216.1 |
On Site Operating Costs ($ million) | 2,280.5 | 2,280.5 | 2,280.5 | 2,280.5 | 2,280.5 |
Operating Cash Flow ($ million) | 3,420.7 | 2,827.3 | 3,198.2 | 3,939.9 | 4,310.8 |
Initial Capital Expenditure ($ million) | 717.7 | 717.7 | 717.7 | 717.7 | 717.7 |
Sustaining Capital ($ million) | 164.4 | 164.4 | 164.4 | 164.4 | 164.4 |
Mine Closure and Reclamation ($ million) | 81.6 | 81.6 | 81.6 | 81.6 | 81.6 |
Total Capital Expenditure ($ million) | 963.7 | 963.7 | 963.7 | 963.7 | 963.7 |
NCF ($ million) | 2,457.0 | 1,863.6 | 2,234.5 | 2,976.2 | 3,347.1 |
table continues…
NovaCopper Inc. | 22-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Description | Base Case | Alternate Case 1 | Alternate Case 2 | Alternate Case 3 | Alternate Case 4 |
Discounted Cash Flow NPV ($ million) at 5% | 1,352.9 | 963.1 | 1,206.7 | 1,694.0 | 1,937.7 |
Discounted Cash Flow NPV ($ million) at 8% | 927.7 | 618.9 | 811.9 | 1,198.0 | 1,391.0 |
Discounted Cash Flow NPV ($ million) at 10% | 710.1 | 443.7 | 610.2 | 943.2 | 1,109.7 |
Payback (years) | 4.6 | 5.1 | 4.8 | 4.3 | 4.1 |
IRR (%) | 22.8 | 18.5 | 21.2 | 26.3 | 28.7 |
Cash Cost, Net of By-product Credit ($/lb Cu payable) | 0.62 | 0.62 | 0.62 | 0.62 | 0.63 |
Capital Cost ($/lb Cu payable) | 0.64 | 0.64 | 0.64 | 0.64 | 0.64 |
Total Cost ($/lb Cu payable) | 1.26 | 1.26 | 1.26 | 1.27 | 1.27 |
A PEA should not be considered to be a prefeasibility or feasibility study, as the economics and technical viability of the Arctic Project have not been demonstrated at this time. The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Furthermore, there is no certainty that the conclusions or results as reported in the PEA will be realized. Mineral resources that are not mineral reserves do not have demonstrated economic viability.
Under the NANA Agreement, NANA has the right, following a construction decision, to elect to purchase a 16% to 25% direct interest in the Project or, alternatively, to receive a 15% Net Proceeds Royalty (NPR). This PEA was prepared on a 100% ownership basis and does not include the impact on NovaCopper if NANA elects to purchase an interest in the Project under the NANA Agreement or, alternatively, the impact on NovaCopper and the Project if the NPR becomes applicable. The PEA does include the 1.0% NSR to be granted to NANA under the NANA Agreement in exchange for a surface use agreement. Section 4.3.2 provides additional information on the NANA Agreement.
Tetra Tech investigated the sensitivity of NPV, IRR and payback period to the key Arctic Project variables. Using the base case as a reference, each of key variables was changed between -30% and +30% at a 10% interval while holding the other variables constant. The following key variables were investigated:
| • | copper price |
| • | lead price |
| • | zinc price |
| • | gold price |
| • | silver price |
| • | capital costs |
| • | on-site operating costs |
| • | off-site operating costs. |
The Arctic Project’s pre-tax NPV, calculated at an 8% discount rate, is most sensitive to copper price and, in decreasing order, on site operating costs, off site operating costs, capital costs, zinc price, silver price, gold price and lead price (Figure 22.2).
NovaCopper Inc. | 22-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 22.2 Pre-tax NPV Sensitivity Analysis
As shown in Figure 22.3, the Arctic Project’s pre-tax IRR is most sensitive to the copper price followed by capital costs, on site operating costs, off site operating costs, zinc price, silver price, gold price and lead price.
Figure 22.3 Pre-tax IRR Sensitivity Analysis
The payback period (Figure 22.4) is sensitive to copper price followed by on site operating costs, off site operating costs and capital costs and less sensitive to the rest of variables.
NovaCopper Inc. | 22-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 22.4 Pre-tax Payback Period Sensitivity Analysis
22.4 | POST-TAXFINANCIALANALYSIS |
NovaCopper engaged EY in Vancouver, BC to prepare tax calculations for use in the post-tax economic evaluation of the Arctic Project with the inclusion of US Federal and Alaska State income taxes, and the Alaska Mining License tax.
The following tax regime was provided by EY and recognized as applicable at the time of report writing. Taxes deducted in the post-tax analysis include US Federal Tax, Alaska State Tax (AST) and Alaska Mining License Tax (AMLT). Taxes are calculated based on currently enacted United States and State of Alaska tax laws and regulations.
US Federal taxes are determined annually as the higher of “regular” corporate income tax and Alternative Minimum Tax (AMT).
Regular US Federal tax is 35% of taxable income, where taxable income is calculated as revenues less allowable costs. In addition to other allowable costs, Alaska State Income, AMLT, tax depreciation and the greater of the cost depletion or the percentage depletion can be deducted. Depreciation is calculated based on actual capital costs using the applicable tax methods allowable. Cost depletion is based on sales of minerals. Percentage depletion is the lower of a specified percentage of net metal revenues (gross revenues net of royalties) and 50% of net taxable income from mining activities before depletion. Relevant specified percentages are 15% for gold, silver and copper, and 22% for lead and zinc. Losses in a given year may be carried back two years and carried forward for 20 years, except losses incurred as a result of the reclamation costs, which may be carried back 10 years.
NovaCopper Inc. | 22-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
AMT is calculated as 20% of AMT income, which is regular taxable income plus certain adjustments for AMT “preferences”. Depreciation for AMT purposes is calculated at lower initial rates using the same asset class life as for regular tax. AMT percentage depletion in each year is limited to the tax basis of the mineral property. The excess of AMT over regular tax is pooled and credited against the future regular tax in excess of AMT.
For the purposes of this report, as a stand-alone project, it was assumed that the initial adjusted cost base of the depletable and depreciable property was zero and that the initial loss carry-forwards were zero. NovaCopper US Inc. has over $100 million of non-capital losses accumulated to date. Some of these losses may be utilized in the future to reduce NovaCopper’s taxable income from the Arctic Project. Further analysis would be required to determine the actual impact on taxes.
AST is determined on a basis similar to US federal tax, with taxes calculated under both a “regular” corporate tax regime and an Alaska AMT. Regular AST is calculated as 9.4 % of taxable income, where taxable income is calculated on the same basis as US federal tax (except that state tax is not deductible). Alaska AMT is calculated as 18% of federal AMT.
22.4.3 | ALASKAMININGLICENSETAX |
AMLT is an income-based tax, calculated as 7% of the mining income calculated for regular AST purposes, before any deduction of AMLT, except the percentage depletion is the lower of 15% of net metal revenues and 50% of net income before depletion. No loss carry-forwards or carry-backs are applied when calculating income subject to AMLT. No AMLT tax is charged for the first 3.5 years following commencement of production. In each year, AMLT can be reduced by up to 50% through the application of “Exploration Incentive Credits” (EICs).
For the purposes of this report, as a stand-alone project, it was assumed that the initial EIC balance is zero even though the Company has a history of exploration at the Project. It was also assumed that no EICs would be earned over the life of the Arctic Project.
22.4.4 | TAXES ANDPOST-TAXRESULTS |
At the base case metal prices used for this study, the total estimated taxes payable on the Arctic Project profits are $811.6 million over the 12-year mine life. The components of the various taxes that will be payable for the base case and the alternate copper price cases are shown in Table 22.3.
NovaCopper Inc. | 22-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| Table 22.3Components of the Various Taxes | |
Tax Component | Base Case | Alternate Case 1 | Alternate Case 2 | Alternate Case 3 | Alternate Case 4 |
Copper Price ($/lb) | 2.90 | 2.50 | 2.75 | 3.25 | 3.50 |
Lead Price ($/lb) | 0.90 | 0.90 | 0.90 | 0.90 | 0.90 |
Zinc Price ($/lb) | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 |
Gold Price ($/oz) | 1,300 | 1,300 | 1,300 | 1,300 | 1,300 |
Silver Price ($/oz) | 22.70 | 22.70 | 22.70 | 22.70 | 22.70 |
Alaska Mining License Tax ($ million) | 115.4 | 87.9 | 105.1 | 139.4 | 156.6 |
Alaska State Income Tax ($ million) | 158.0 | 126.2 | 146.1 | 189.0 | 213.9 |
Federal Income Tax ($ million) | 538.2 | 429.9 | 497.6 | 640.7 | 724.7 |
Total Taxes ($ million) | 811.6 | 644.0 | 748.7 | 969.1 | 1,095.2 |
The base case and the alternate cases post-tax financial results are summarized in Table 22.4.
Table 22.4 Summary of Post-tax Financial Results
Description | Base Case | Alternate Case 1 | Alternate Case 2 | Alternate Case 3 | Alternate Case 4 |
Copper Price ($/lb) | 2.90 | 2.50 | 2.75 | 3.25 | 3.50 |
Lead Price ($/lb) | 0.90 | 0.90 | 0.90 | 0.90 | 0.90 |
Zinc Price ($/lb) | 0.85 | 0.85 | 0.85 | 0.85 | 0.85 |
Gold Price ($/oz) | 1,300 | 1,300 | 1,300 | 1,300 | 1,300 |
Silver Price ($/oz) | 22.70 | 22.70 | 22.70 | 22.70 | 22.70 |
NCF ($ million) | 1,645.5 | 1,219.6 | 1,485.8 | 2,007.1 | 2,251.9 |
Discounted Cash Flow NPV ($ million) at 8% | 537.2 | 312.4 | 453.0 | 727.6 | 857.3 |
Payback (years from start of mill operations) | 5.0 | 5.6 | 5.2 | 4.6 | 4.4 |
IRR (%) | 17.9 | 14.0 | 16.5 | 20.9 | 22.9 |
Tetra Tech has relied on NovaCopper on the royalties applicable to the Arctic project used in the economic analysis and the related text below.
As contemplated in the NANA Agreement, a surface use agreement will be executed with NANA upon a mine construction decision for NovaCopper to use NANA lands for access and for mining facilities such as, but not limited to, buildings, tailings ponds, waste dumps, structure landing areas and laydown yards. In exchange for the surface use agreement NovaCopper will grant NANA a 1% NSR royalty on the Arctic Project. NANA’s 1% royalty was incorporated into the Project’s economic analysis.
In addition, under the NANA Agreement, NANA has the right, following a construction decision, to elect to purchase a 16% to 25% direct interest in the Project or, alternatively, to receive a 15% NPR. This PEA was prepared on a 100% ownership basis and does not include the impact on NovaCopper if NANA elects to purchase an interest in the Project under the NANA Agreement or, alternatively, the impact on NovaCopper and the Project if the NPR becomes applicable. Section 4.3.2 provides additional information on the NANA Agreement.
NovaCopper Inc. | 22-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
There is an existing 1% NSR royalty on the Arctic Project which is held by a third party. This royalty was granted when NovaGold purchased a 100% interest in the Ambler lands, which include the Arctic Deposit. NovaCopper, which is the owner of the Property, can purchase back this royalty, at any time, for a one-time payment of $10.0 million. More information on this royalty can be found in NovaCopper’s 2012 annual financial statements. For the purposes of the PEA, given the likelihood of NovaCopper repurchasing this royalty before the commencement of mine construction, this royalty wasnot incorporated into the economic analysis.
Typical smelter terms have been applied for the delivery of copper, lead and zinc concentrates to an East Asian smelter based on Tetra Tech’s in-house database of similar projects.
Copper concentrate contracts will generally include payment terms as follows:
| • | copper – pay 100% of content less 1.0 unit at the London Metal Exchange (LME) price for Grade A copper less a refining charge of $0.07 per accountable pound |
| • | treatment charge – $70/dmt of concentrate delivered |
| • | gold credit – pay 95% of content, refining charge is $10/payable oz |
| • | silver credit – pay 90% of content, refining charge is $0.60/payable oz |
| • | penalty charge – $0.02 per each ppm above 5 ppm mercury; $1.50 per each 1% above 1% lead; $1.50 per each 1% above 3% zinc. |
Lead concentrate contracts will generally include payment terms as follows:
| • | lead – pay 100% of content less 3.0 units at the LME price |
| • | treatment charge – $180/dmt of concentrate delivered |
| • | gold credit – pay 95% of content, refining charge is $10/payable oz |
| • | silver credit – pay 90% of content, refining charge is $0.60/payable oz |
| • | penalty charge – $1.50 per each 0.1% above 0.2% arsenic; $1.50 per each 0.1% above 0.1% antimony; $1.00 per each 1% above 8% zinc. |
Zinc concentrate contracts will generally include payment terms as follows:
| • | zinc – pay 100% of content less 8 units at the LME price |
| • | treatment charge – $260/dmt of concentrate delivered |
| • | gold credit – none |
| • | silver credit – none |
| • | penalty charge – none. |
NovaCopper Inc. | 22-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
22.7 | TRANSPORTATIONLOGISTICS |
Transportation costs for the concentrates are as follows:
| • | trucking – $64.98/wmt |
| • | port storage and handling – $20.00/wmt |
| • | ocean transport to Asian port – $63.00/wmt |
| • | moisture content – 9% |
| • | concentrate losses due to the different handling operations is assumed to be |
| | 0.42% of concentrate weight. |
An insurance rate of 0.15% was applied to the provisional invoice value of the concentrates.
22.9 | REPRESENTATION ANDMARKETING |
An allowance of $2.50/t of concentrate was applied in the economic analysis to account for the representation and marketing.
NovaCopper Inc. | 22-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Adjacent to NovaCopper’s land holdings, which encompass the Arctic Deposit and a number of VMS prospects of the Ambler Sequence, are two geologically similar deposits: the Sun Deposit owned by Andover Mining Corp. (Andover) and the Smucker Deposit owned by Teck Resources Ltd. (Teck). Both prospects are located in the Ambler Schist belt (Figure 23.1). Neither contains a current mineral resource estimate.
Figure 23.1 Adjacent Properties and Land Status
Andover has a 100% interest (subject to 1.5% production royalty) in the Sun Property, also referred to as the Hot prospect, located in the Ambler Schist Belt, roughly 56 km (35 miles) east of NovaCopper’s Arctic Deposit. The Sun Property consists of a total of 230 claims, representing a land position of 36,800 acres.
The Sun Property includes silver-copper-lead-zinc-gold mineralization on the Main Sun Deposit, S.W. Sun Deposit, and a number of other prospects (Figure 23.2). In total, 96 drill holes totalling 19,285 m have been completed on the Sun Property. Andover completed 47 holes during 2007, 2011 and 2012, with 49 drill holes completed by previous operators Anaconda, Noranda, Cominco and Bear Creek. A historical prefeasibility study on the Sun Deposit conducted for Anaconda Copper Mining Company in 1977 by Canadian Mine Services Ltd., Kilborn Engineering (B.C.) Ltd., and Swan Wooster Engineering Co. Ltd, projected the following resources shown in Table 23.1.
NovaCopper Inc. | 23-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Andover maintains a 20 person camp at the Sun project along with a 1,500 ft airstrip built in 2007. The camp consists of living quarters, core-logging facilities, geological office, mess facility, showers, laundry facilities, generator and tool storage, and indoor and outdoor core storage (Figure 23.2).
The historic resource estimates are considered relevant but not necessarily reliable. In each case, a significant amount of resampling and verification is needed to upgrade or verify the historical estimate as current mineral resources or mineral reserves. Please note that a QP has not done sufficient work to classify any of the the historical estimates as current mineral resources or mineral reserves and the issuer is not treating the historical estimates as current mineral resources or mineral reserves.
This historical estimate is not catgorized, and it is not known what the equivalent CIM category would be.
Table 23.1 Sun Deposit Historical Resources
| Resource (t) | Status | Ag (oz/t) | Cu (%) | Pb (%) | Zn (%) |
Open Pit | 2,399,000 | Historical | 2.39 | 1.93 | 1.20 | 4.51 |
Underground | 17,891,000 | Historical | 2.37 | 1.91 | 1.18 | 4.46 |
NovaCopper Inc. | 23-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Figure 23.2 Sun Project Prospect Location Map
Teck owns a 100% interest in the Smucker Property, located 40 km (24 miles) west-northwest of the Arctic Deposit in the same terrane and lithological sequence as the Arctic Deposit. Like the Arctic Deposit, the Smucker Deposit is described as a polymetallic copper-lead-zinc-gold-silver VMS prospect. Currently in target delineation stage, the Smucker Property does not have a current NI 43-101 compliant resource estimate.
Significant drilling by Anaconda in the 1970s intersected precious metal-rich VMS mineralization analogous to the other prospects of the Ambler Sequence (Ambler Schist belt). Table 23.2 shows the reported historical resource estimates for the Smucker Deposit.
The historic resource estimates are considered relevant but not necessarily reliable. In each case, a significant amount of resampling and verification is needed to upgrade or verify the historical estimate as current mineral resources or mineral reserves. Please note that a QP has not done sufficient work to classify any of the the historical estimates as current mineral resources or mineral reserves and the issuer is not treating the historical estimates as current mineral resources or mineral reserves.
NovaCopper Inc. | 23-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
This historical estimate is not catgorized, and it is not known what the equivalent CIM category would be.
Table 23.2 Smucker Deposit Historical Resources
Deposit | Resource (Mt) | Status | Cu (%) | Zn (%) | Pb (%) | Ag (g/t) | Au (g/t) |
Smucker | 7.2 | Historical | 0.5 | 4.9 | 1.7 | 156.0 | 1.1 |
NovaCopper Inc. | 23-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
24.0 | OTHER RELEVANTDATAANDINFORMATION |
In addition to the Arctic Deposit, NovaCopper, through its agreement with NANA, is actively exploring the Bornite Deposit in the Bornite Carbonate Sequence roughly 17 km southwest of the Arctic Deposit (Figure 23.1). Tetra tech has been unable to verify the information and that the information is not necessarily indicative of the mineralization on the Property that is the subject of the technical report.
In 2013, NovaCopper released an updated NI 43-101 technical report on the resource estimation of the South Reef and Ruby Creek zones of the Bornite Deposit. Results of that estimation are tabulated in Table 24.1.
A total of 217 drill holes, totaling 70,003 m, are considered to be targeted in proximity to the Bornite Deposits. These holes have been completed during 20 different annual campaigns dating from 1957 through 2012. Three underground exploration programs including 51 drill holes and targeting the No.1 Ore Body at Ruby Creek were completed between 1966 and 1968. All of the drill campaigns, with the exception of the 2011 NovaGold campaign and the 2012 NovaCopper campaign, 14 and 22 drill holes, respectively, were completed by Kennecott.
Table 24.1 Bornite NI 43-101 Resources
Deposit | Resource (Mt) | Cut- off (%) | Class | Cu (%) | Cu (Mlb) |
Bornite – Ruby Creek Zone | 6.8 | 0.5 | Indicated | 1.19 | 179 |
Bornite – Ruby Creek Zone | 47.7 | 0.5 | Inferred | 0.84 | 883 |
Bornite – South Reef Zone | 43.1 | 1.0 | Inferred | 2.54 | 2,409 |
| Note: | Mineral resources that are not mineral reserves do not have demonstrated economic viability. Inferred resources have a great amount of uncertainty as to their existence and whether they can be mined legally or economically. It cannot be assumed that all or any part of the Inferred resources will ever be upgraded to a higher category. |
At Bornite, mineralization is hosted in deformed Devonian clastic and carbonate sedimentary rocks lying immediately south of the Ambler Schist Belt rocks across the Ambler lowlands. Widespread hydrothermal dolomitization is characteristic of the belt and hosts the associated copper mineralization. Copper mineralization at Bornite is comprised of chalcopyrite, bornite, and chalcocite as stringers, veinlets, and breccia fillings distributed in stacked, roughly stratiform zones exploiting favourable stratigraphy.
In 2013, NovaCopper expects to continue expansion of the Bornite deposit. The 2013 program included four drill rigs and approximately 8,200 m of drilling targeted at expanding the Ruby Creek and South Reef resources.
NovaCopper Inc. | 24-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
25.0 | INTERPRETATIONANDCONCLUSIONS |
Tetra Tech has prepared a PEA for the Arctic Project and a technical report prepared in accordance with NI 43-101 and Form 43-101F1. The PEA describes the potential technical and economic viability of establishing a conventional open pit mine, a mill complex and related infrastructure to process massive and semi-massive copper-zinc-lead-silver-gold mineralization from the Arctic Deposit. Based on the work carried out in this PEA and the resultant economic evaluation, this study should be followed by further technical and economic studies leading to a prefeasibility study.
25.2 | PROPERTY DESCRIPTION AND LOCATION |
Information from NovaCopper supports that the mining tenure held is valid and is sufficient to support declaration of mineral resources. Tenures have been surveyed in accordance with appropriate regulatory requirements. Annual claim-holding fees have been paid to the relevant regulatory authority and all applicable permits for current work activities are valid. There are no known environmental liabilities due to previous operators or ongoing NovaCopper exploration activities at the Property.
The Arctic Deposit is considered to be an example of a polymetallic (copper-zinc-lead-silver-gold) VMS-style occurrence, common within the Ambler Sequence stratigraphy of the Ambler District. Knowledge of the deposit settings, lithologies, structural and alteration controls on mineralization and SG, and the mineralization style and setting is sufficient to support mineral resource estimation.
The exploration and drilling programs completed to date are appropriate to the type of the deposit. The exploration, drilling, geological modelling and research work supports ore genesis interpretations.
Tetra Tech has reviewed the quantity and quality of the data collected by NovaCopper, and previously by NovaGold, and found it reliable and suitable for the purpose of this study. Review of the QA/QC dataset and reports found NovaCopper’s sample preparation, analysis and security procedures to meet or exceed industry best practices.
It is Tetra Tech’s opinion that the drill database for the Arctic Deposit is reliable and sufficient to support the purpose of this technical report and a current mineral resource estimate.
NovaCopper Inc. | 25-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
25.4 | MINERAL RESOURCE ESTIMATION |
| The mineral resource estimate, as seen in Table 25.1 and which formed the basis of the PEA, was completed by Mr. Michael F. O’Brien, M.Sc., Pr.Sci.Nat, FGSSA, FAusIMM, FSAIMM and an independent QP as set forth by NI 43-101. The overall effective date of this resource estimate is July 30, 2013. Estimations of mineral resources for the Arctic Project conform to industry best practices and meet requirements of CIM (2010). |
| |
| Table 25.1Resource estimate for the Arctic Project (NSR Cut-off of $35/t) |
Category | Mt | Cu (%) | Zn (%) | Pb (%) | Au (g/t) | Ag (g/t) | Cu (Mlb) | Zn (Mlb) | Pb (Mlb) | Au (Moz) | Ag (Moz) |
Indicated | 23.848 | 3.26 | 4.45 | 0.76 | 0.71 | 53.2 | 1,713 | 2,338 | 400.9 | 0.55 | 40.8 |
Inferred | 3.363 | 3.22 | 3.84 | 0.58 | 0.59 | 41.5 | 239 | 285 | 43.2 | 0.06 | 4.5 |
| Notes: | 1. | These resource estimates have been prepared in accordance with NI 43-101 and the CIM Definition Standards. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Inferred resources have a great amount of uncertainty as to their existence and whether they can be mined legally or economically. It cannot be assumed that all or any part of the Inferred resources will ever be upgraded to a higher category. |
| | 2. | Mineral Resources are reported within mineralization wireframes contained within an Indicated and Inferred pit design using an assumed copper price of US$2.90/lb, zinc price of US$0.85/lb, lead price of US$0.90/lb, silver price of US$22.70/oz, and gold price of US$1,300/oz. |
| | 3. | Appropriate mining costs, processing costs, metal recoveries and inter ramp pit slope angles were used to generate the pit design. |
| | 4. | The $35.01/t milled cut-off is calculated based on a process operating cost of $19.03/t, G&A of $7.22/t and site services of $8.76/t. NSR equals payable metal values, based on the metal prices outlined in Note 2 above, less applicable treatment, smelting, refining costs, penalties, concentrate transportation costs, insurance and losses and royalties. |
| | 5. | The LOM strip ratio is 8.39. |
| | 6. | Rounding as required by reporting guidelines may result in apparent summation differences between tonnes, grade and contained metal content. |
| | 7. | Tonnage and grade measurements are in metric units. Contained copper, zinc and lead pounds are reported as imperial pounds, contained silver and gold ounces as troy ounces. |
Factors which may affect the Mineral Resource estimate include advancements/changes to the geological, geotechnical and geometallurgical models, infill drilling to convert mineral resources to a higher classification, extension drilling to test for deep extensions to known resources, and collection of additional SG data. Additional factors which may affect the open pit extraction scenario used to constrain the estimates are commodity price and exchange rate assumptions, assumptions used to estimate metallurgical recoveries, pit slope angles, and variations in the planned infrastructure layout. It should be noted that all factors pose potential risks and opportunities to the current mineral resource. Recommendations to address these risks and opportunities are provided in Section 26.0.
25.5 | METALLURGICAL TEST WORK AND PROCESS DESIGN |
Metallurgical test work and associated analytical procedures were performed by recognized testing facilities, and the tests performed were appropriate to the mineralization type. The samples selected for the 2012 testing were representative of the various types and styles of mineralization present at the Arctic Deposit. The results and conclusions of this study are mainly derived from the 2012 test work.
NovaCopper Inc. | 25-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
In general, the 2012 test results indicated that the samples responded well to the tested flowsheet consisting of talc pre-flotation, conventional copper-lead bulk flotation and zinc flotation, followed by copper and lead separation. The 2012 test work showed that the mineralization from different mineralization zones have slightly different requirements in terms of flotation reagents. These requirements are driven primarily by changes in base metal ratios in the process feed as well as the overall sulphide content of tested samples. According to the test work results, the concentrates produced are expected to be saleable, especially the high-grade copper and zinc concentrates. Further tests are required to optimize the process conditions and flowsheet, especially copper and lead separation, talc removal and test condition optimization for Zone 1 & 2 mineralization.
The grindability test results showed that the mineralized samples are neither resistant nor abrasive to ball mill grinding. The materials are considered to be soft or very soft in terms of grinding requirements.
A 10,000 t/d process plant has been designed for the Arctic Project to process massive/semi-massive sulphide mineralization for the production of separate copper, lead and zinc concentrates. The proposed process plant will consist of one stage of crushing, primary grinding in a SAG mill/ball mill (SAB) grinding circuit, talc pre-flotation, copper-lead rougher and cleaner flotation, zinc rougher and cleaner flotation, and copper and lead separation flotation. The operating philosophy and selected equipment is in line with industry expectations.
Table 25.2 summarizes estimated recoveries and concentrate grades based on the projected mill feed grades.
Further plant design optimization is required to incorporate site conditions and updated test work results to maximize project economics.
Table 25.2 Projected Recoveries and Concentrate Grades
Head Grades (based on proposed mine plan) |
Copper | 2.28% |
Zinc | 3.13% |
Lead | 0.53% |
Silver | 37 g/t |
Gold | 0.50 g/t |
Metal Recoveries |
To Copper Concentrate | |
Copper | 87.1% |
Silver | 40.2% |
Gold | 57.9% |
To Zinc Concentrate |
Zinc | 86.8% |
To Lead Concentrate |
Lead | 74.0% |
table continues…
NovaCopper Inc. | 25-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Silver | 40.2% |
Gold | 6.8% |
Concentrate Grades | |
Copper Concentrate | 29.0% Copper |
Zinc Concentrate | 56.0% Zinc |
Lead Concentrate | 50.0% Lead |
The Arctic Project’s total mine life is 13 years including 1 year of pre-stripping followed by 12 years of production.
The mine will utilize a conventional truck-and-shovel fleet and the proposed open pit operations will provide process plant feed at a nominal rate of 10,000 t/d. The pit design incorporates a bench height of 5 m and an inter-ramp angle of 45°. Pit optimization and design results are based on scoping level geotechnical and operational information.
Due to operational and geometric constraints, the mine will require a ramp-up period of three years before achieving full mill capacity. The mining schedule does not currently consider a low-grade stockpiling option but this can be assessed in more detail in future studies.
Factors which may affect the mine plan include advancements/changes to the geotechnical, hydrological and ML/ARD/SG waste characterization models. Additional factors which may affect the open pit extraction scenario are commodity price assumptions, assumptions used to estimate metallurgical recoveries, pit slope angles, and variations in the planned infrastructure layout. Trade-off studies to optimize the productions schedule, including further work on evaluating equipment size (particularly for the waste material) may prove beneficial.
It should be noted that all factors pose potential risks and opportunities to the current mine plan. Recommendations to address these risks and opportunities are provided in Section 26.0.
25.7 | PROJECT INFRASTRUCTURE |
The Arctic Project infrastructure includes building locations which are based on the assumption that the geotechnical data and the geohazards are favourable, however further investigation is required which could affect planned infrastructure layout.
NovaCopper Inc. | 25-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
25.8 | TAILINGS AND WATER MANAGEMENT |
The work completed to date suggests that the current tailings and water management concept is practicable and should be carried forward to the next level of design.
The tailings and water management concept presented in this study has the potential to be optimized. The surficial geology and geotechnical conditions should be investigated and the design basis and operating criteria should be further refined.
25.9 | ENVIRONMENTAL STUDIES, PERMITTING, AND SOCIAL OR COMMUNITY IMPACT |
The Arctic Project will be subject to a mine permitting process typical for a mine of its size in Alaska. NovaCopper will need to apply for appropriate mining operations-related permits under NWAB, state and federal laws to allow proposed mining operations. Exploration activities completed to date have been conducted under the relevant permits.
In order to support this process, NovaCopper will have to broaden their existing baseline environmental program and complete a number of additional studies that will support the permit applications and mine plan. NovaCopper has signed a cooperative agreement with NANA, which formalized an Oversight Committee and a Subsistence Committee, a Communications Subcommittee and a Workforce Development Subcommittee. NovaCopper is formally engaging the Arctic Project stakeholders in a deliberate effort to make the Project directly beneficial to them throughout the life of the project. NovaCopper will be required to develop a mine plan that is protective of the environment during mining operations as well as a reclamation and closure plan that ensures the environment is protected well after mine closure. There are no characteristics of the Arctic Project from an environmental, permitting or community impact perspective that should prevent NovaCopper from advancing this project to the next stage.
NovaCopper Inc. | 25-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
Tetra Tech prepared an economic evaluation of the Arctic Project based on a pre-tax financial model. NPV was estimated at the beginning of the two-year construction period. NovaCopper engaged the Canadian firm of EY in Vancouver, BC to prepare tax calculations for use in the post-tax economic evaluation of the Arctic Project with the inclusion of US federal and Alaska income taxes and Alaska Mining License tax. Economic merit measures such as NPV, IRR and payback period were estimated on both pre-tax and post-tax basis for the base case and four alternate metal price cases. Sensitivity analyses were conducted to analyze the sensitivity of the Arctic Project merit measures (NPV, IRR and payback periods) to the main inputs. Using the base case as a reference, each of key variables was changed between -30% and +30% at a 10% interval while holding the other variables constant. The Arctic Project’s pre-tax NPV, calculated at an 8% discount rate, was found to be most sensitive to copper price and, in decreasing order, on site operating costs, off site operating costs, capital costs, zinc price, silver price, gold price and lead price. The pre-tax IRR was found to be most sensitive to the copper price followed by capital costs, on site operating costs, off site operating costs, zinc price, silver price, gold price and lead price. The payback period was found to be sensitive to copper price followed by on site operating costs, off site operating costs and capital costs and less sensitive to the rest of variables. Using base case long-term metal prices of $2.90/lb for copper, $0.85/lb for zinc, $0.90 for lead, $22.70/oz for silver and $1,300/oz for gold, the pre-tax NPV at an 8% discount rate was $927.7 million calculated at the beginning of the two-year construction period and IRR was 22.8%. After-tax NPV was $537.2 million and after-tax IRR was 17.9%. The estimated payback period was 4.6 years before-tax and 5.0 years after-tax.
NovaCopper Inc. | 25-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Tetra Tech recommends the following actions and activities in support of advancing the Arctic Project should NovaCopper determine that a prefeasibility study is warranted. As part of the recommended work program, additional exploration and geotechnical drilling will be required to support the following studies/permits: geotechnical studies, metallurgical studies, engineering studies, waste-rock characterization studies, additional baseline studies and environmental permitting activities, marketing studies and numerous trade-off studies. Additional areas for work are also likely to be identified as activities progress. The total estimated direct program costs are approximately $6 million to $6.5 million, which excludes site costs such as camp support, overhead and other indirect costs.
Tetra Tech makes the following recommendations for future work:
| • | Model Integration: The geological model for the various mineralized zones (based on interpretation of geological and metal sampling data), geotechnical model, ARD model and the density model (based on SG measurements and barite occurrence) should be integrated into a single block model and correlating wireframes to provide a single repository of deposit data. |
| • | Bulk Density Characterization: Historically, drill hole data was collected on the assumption of eventual underground exploitation. Consequently, only limited SG data was collected for the overlying rocks above the mineralized zones. The bias in the existing SG dataset in favor of the rock adjacent to the mineralized zones is likely to positively bias the estimate of the SG of the waste material to be stripped. A more representative set of SG measurements of the shallow schistose and potentially more weathered near surface material, represents an opportunity to decrease the stripping ratio for proposed open pit mining. At least 500 additional measurements, from representative intervals of the hanging wall units from existing cores in good condition, would provide better spatial representation and should be added to the database. An integrated geological model would also support better SG definition along domain boundaries. |
| • | Diamond Drilling: Material currently classified as an Inferred resources on the deeper southern edges of the deposit should be drilled to support conversion to Indicated Resources (75 m centres). The proposed drilling would total 4,400 m and it is anticipated that approximately 700 m would require assaying. |
NovaCopper Inc. | 26-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The estimated cost of the recommended drilling, assaying and SG characterization work is $3.52 million.
26.3 | MINERAL PROCESSING AND METALLURGICAL TESTING |
In general, the flowsheet developed in the 2012 test program is feasible for the Arctic Deposit mineralization; however, Tetra Tech recommends further metallurgical test work on representative samples to optimize the flowsheet and process conditions, and to determine the design-related parameters required for further studies. Tetra Tech makes the following recommendations for future work:
| • | Additional metallurgical test work and mineralogical evaluations should be conducted to confirm the metallurgical response of the representative samples to the established process flowsheet. The tests should focus on 1) the impact of talc on copper and lead bulk flotation, 2) zinc mineral suppression reagent regime optimization for copper and lead bulk flotation, and 3) copper and lead separation. |
| • | Additional variability test work on samples generated from different mineralization zones with different head grades, and samples representing the initial three to five years of mill feed, should be undertaken. |
| • | Locked-cycle test work, or a mini-pilot plant, using bulk copper-lead concentrate produced from a larger bulk sample should be undertaken. Optimization of the copper and lead separation process is warranted as it will directly affect the saleable nature of the copper and lead concentrates and limited work in this area has been completed to date. |
| • | Process design-related parameters should be determined, including material bulk density, grindability index, concentrate settling rates and filtration rates. As well, simulations for the proposed grinding circuit should be conducted. The destruction of residual cyanide in the copper and lead concentrate slurries should be studied. |
The estimated cost of the mineral processing and metallurgical test work is estimated to be $780,000.
Further optimizations on plant designs including primary comminution circuits, flotation circuits, regrinding circuits and layout are recommended including incorporating updated test work results to optimize the process flowsheet. The costs associated with the optimizations will be part of the costs for the next phase of study.
The mine plan should be optimized to evaluate if increasing the mill feed rate for the initial mine life is achievable.
NovaCopper Inc. | 26-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Tetra Tech makes the following recommendations for future work:
| • | Conduct geotechnical studies to better define the appropriate design pit slope angles and to investigate the fractured area to the south-east of the proposed open pit. |
| • | Perform a trade-off study on the optimum mill capacity. |
| • | Perform a trade-off study to investigate low-grade stockpiling. |
| • | Perform a trade-off study to investigate different mine fleet options. |
The estimated cost for the proposed mining work will be approximately $250,000.
26.6 | PROJECT INFRASTRUCTURE |
Additional studies outlined below are recommended for advancing the Arctic Project infrastructure. The definition of a unified project footprint with appropriately augmented topography is recommended.
26.6.1 | PROCESS PLANT AND INFRASTRUCTURE LOCATION |
Additional studies for the location of the process plant and related infrastructure will be required. An investigation of the soil conditions needs to be performed in order to simplify the design of the mill building and major equipment foundations. Tetra Tech makes the following recommendations for future work:
| • | Drilling: A total of six drill holes (30 m deep) will be required at the primary crusher (one drill hole), mill building (two drill holes), stockpile (one drill hole), waste dump (two drill holes). The cost of the work is estimated to be $60,000. For the open pit area, a total of eight drill holes (approximately 250 m deep) will be required within the pit. The cost of the work is estimated to be $600,000. |
| • | A geohazard evaluation study including avalanche paths and probable impact. The cost of the work is estimated to be $60,000. |
| • | Field investigations to examine the maximum flow at freshette. The cost of the work is estimated to be $40,000. |
| • | Ground investigation by a geotechnical engineer. The cost of the work is estimated to be $20,000. |
The total estimated cost for the process plant and infrastructure location studies is $780,000.
NovaCopper Inc. | 26-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Further geotechnical detail and aggregate sourcing data will be required to support access road design. Tetra Tech makes the following recommendations for future work:
| • | Six drill holes 10 to 15 m deep at the proposed three bridges abutments - The cost of the work is estimated to be $20,000. |
| • | Ten test pits (2 to 3 m deep) for borrow material every 2 km along the access road borrow sources. The cost of the work is estimated to be $50,000. |
| • | Ten drill holes (10 to 15 m deep) required every 500 m for the last 5 km of the alignment to confirm the subgrade type. The cost of the work is estimated to be $120,000. |
The total estimated cost for the access road test work is $190,000.
26.6.3 | ELECTRICAL POWER GENERATION |
In July 2013, AIDEA released a feasibility report on the Interior Energy Project (IEP). The proposed project would include a natural gas liquefaction plant located on the North Slope of Alaska near Deadhorse. From the Plant, liquefied natural gas (LNG) would be trucked almost 800 km (500 miles) south to Fairbanks, primarily along the Dalton Highway. Based on the economic and financial analysis conducted in the feasibility, the IEP is projected to be feasible, with natural gas delivered to residential and commercial customers in the Fairbanks North Star Borough at prices sufficiently below current energy costs (AIDEA 2013). Tetra Tech recommends conducting a trade-off study to investigate optimized on-site power generation by LNG compared to diesel. The cost for the study is expected to be $50,000.
Tetra Tech makes the following recommendations for future work:
| • | Two drill holes 10 to 15 m deep required to test for permafrost. The cost of the work is estimated to be $10,000. |
| • | Refine alignment, apron sizing/requirements. The estimated cost is $30,000. |
The total estimated cost for the airstrip evaluation is $40,000.
26.6.5 | TAILINGS AND WASTE MANAGEMENT |
TAILINGS
Tetra Tech makes the following recommendations for future work:
NovaCopper Inc. | 26-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
| |
| • | Conduct geotechnical investigation of embankment and spillway sites to characterize potential construction and borrow materials. The cost of the work is estimated to be $60,000. |
| • | Further define plant information including: tailings production rates (average, maximum, minimum), range of slurry solids concentrations, and required capacity of reclaim water system (mill water demand). The cost of the work is estimated to be $30,000. |
| • | Complete additional tailings characterization studies including: tailings rheology, geochemical and mineralogical characteristics, water release and recovery rates, supernatant hydrochemistry, shear strength, dispersive tendency, average beach slope, tailings surface accessibility with time, drying and strength gain of deposited tailings, and crust development and dust generation. The cost of the work is estimated to be $80,000. |
| • | Evaluate embankment stability to include additional data from a detailed geotechnical investigation including: seismic deformation analysis, foundation preparation requirements, optimization of embankment geometry, embankment critical section, evaluation of potential embankment raises, tailings liquefaction potential. The cost of the work is estimated to be $10,000. |
| • | Conduct a water balance. The cost of the work is estimated to be $10,000. |
| • | Further evaluate tailings co-disposal with waste rock to optimize operation and mitigate acid generation. The cost of the work is estimated to be $15,000. |
| • | Complete a detailed geohazard evaluation for the tailings site. The cost of the work is estimated to be $10,000. |
The total estimated cost to design the TSF at the prefeasibility level is $215,000.
WATER MANAGEMENT
Tetra Tech makes the following recommendations for future work:
| • | Baseline work should be conducted to support design parameters that will support the design of the water management structures. This will include detailed field data acquisition and laboratory testing programs to characterize hydrological, hydrogeological and geo-environmental conditions for the proposed project. The cost of the work is estimated to be $20,000. |
| • | Hydrology and hydraulic analyses, including a detailed water balance, will need to be completed to determine the types, locations and sizes of the water management structures as well as the times and quantities of discharges. The cost of the work is estimated to be $10,000. |
| • | Geochemical modelling must be carried out to establish potential acidity of surface run-off over the temporary waste dumps and pit, in order to assess the need for collecting and treating contact water or discharging it directly to existing natural streams. The cost of the work is estimated to be $135,000. |
NovaCopper Inc. | 26-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
The total estimated cost to design the storm water management plan at the prefeasibility level is $185,000.
Additional environmental baseline studies are required to advance the Arctic Project through the prefeasibility stage. Existing hydrology and aquatic life monitoring should be broadened to cover additional streams in the Arctic Project area and sampling frequency may need to be increased. In addition, the baseline program should be broadened to include additional studies such as ground water hydrology, meteorology, geochemistry – waste rock characterization, wetlands delineation and functional assessment, wildlife and subsistence surveys. An accurate water balance model is needed for developing robust mine and closure plans. Sufficient meteorological and hydrology data (in terms of frequency and duration in years) are required in developing that water balance model. It is beyond the scope of the document to make more specific recommendations. Annual costs for environmental monitoring and studies could range from less than $100,000 to more than $500,000 in certain years.
A concentrate marketing study is required to investigate the marketability of the three concentrates and better define the applicable transportation, insurance, marketing, refining and smelting costs. The cost of the work is estimated to be $50,000.
NovaCopper Inc. | 26-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Alaska Climate Summaries: Kobuk (1971-2000) http://www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?akkobu.
Aleinikoff, J. N., Moore, T. E., Walter, M., and Nokleberg, W. J. (1993). U-Pb ages of zircon, monazite, and sphene from Devonian Metagranites and Metafelsites, Central Brooks Range, Alaska: U.S. Geological Survey Bulletin, v. B 2068, p. 59-70.
BD Resource Consulting (2013). Technical Report for the Bornite Property, South Reef and Ruby Creek Zones, Northwest Alaska, USA. Prepared by BD Resource Consulting Inc. for NovaCopper. Report Date February 8, 2013, 149 pages.
Bearing Marine Lines (2007). Personal Communication with Company Representative.
BGC Engineering Inc. (2012). Rock Mechanics and Hydrogeology Study, Ambler project, Arctic Deposit, SubArctic Creek, Alaska draft report. October 2012.
Brown, H. (2011). Memo to Ambler Staff “Ambler District Database Audit”: Internal NovaGold Resources Inc. Memo, May 19, 2011.
Dillon, J. T., Pessel, G. H., Chen, J. H., and Veach, N. C. (1980). Middle Paleozoicmagmatism and Orogenesis in the Brooks Range, Alaska: Geology, v. 8, p. 338-343.
Dillon, J. T., Tilton, G. R., Decker, J., and Kelley, M. J. (1987). Resource Implications of Magmatic and Metamorphic Ages for Devonian Igneous Rocks in the Brooks Range, in Tailleur, I. L., and Weimer, P., Alaskan North Slope Geology, Pacific Section, Society of Economic Paleontologists and Mineralogists, p. 713-723.
Dodd, S. P., Lindberg, P. A., Albers, D. F., Robinson, J. D., Prevost, R. (2004). Ambler Project, 2004 Summary Report, Unpublished Internal Report, Alaska Gold Company.
Gottschalk, R. R., and Oldow, J. S. (1988). Low-angle Normal Faults in the South-central Brooks Range Fold and Thrust Belt, Alaska, Geology, 16, p. 395-399.
Hitzman, M. W. (1982). Geology of the Ruby Creek Copper Deposit, Southwestern Brooks Range, Alaska: Economic Geology v. 81, p. 1644-1674.
NovaCopper Inc. | 27-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Hitzman, M. W., Smith, T. E., and Proffett, J. M. (1982). Bedrock Geology of the Ambler District, Southwestern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 75, scale 1:250,000.
Hitzman, M. W., Proffett, J. M., Schmidt, J. M., and Smith, T. E. (1986). Geology and Mineralization of the Ambler District, Northwestern Alaska: Economic Geology v. 81, p. 1592-1618.
Kennecott Research Center (September 1968). Amenability Testing of Diamond Drill Core Samples from Arctic, Alaska Project, TR 68-20.
Kennecott Research Center (August 1972). Amenability Testing of Samples from Bear Creek Mining Company’s Arctic Deposit, TR 72-12.
Kennecott Research Center (September 1976). Recovery of Mineral Values Arctic Prospect, RTR 76¬22.
Kennecott (1977). Annual Report Arctic Deposit: Unpublished in-house report.
Kennecott (1998). Arctic Deposit and Ambler District Field Report: Unpublished in-house report.
Kennecott Research Center (January 1997). Process Selection for Arctic Deposit, Technical Report RTR 77-4.
Kobuk Valley National Park (2007). www.kobuk.valley.national-park.com/info.htm#env.
Lakefield Research Limited (January 7, 1999). An Investigation of the Recovery of Lead, Zinc & Precious Metals from Samples of the Arctic Project Ore submitted by Kennecott Minerals, Progress Report No.1.
Lindberg, P. A. (2004). Structural Geology of the Arctic Cu-Zn-Pb-Ag Sulfide Deposit: Alaska Gold Company Unpublished Report.
Michaelson, S. D. (March 11, 1970). Memo to H. L. Bauer.
Moore, T. E., Wallace, W. K., Bird, K. J., Karl, S. M., Mull, C. G., and Dillon, J. T. (1994). Geology of Northern Alaska, in Plafker, G., and Berg, H. C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North America, v. G1, p. 49-140.
Mull, C. G. (1982). Tectonic Evolution and Structural Style of the Brooks Range, Alaska; an Illustrated Summary, in Geologic Studies of the Cordilleran Thrust Belt, Rocky Mt. Assoc. Geol., Denver, CO, United States (USA), p. 1-45.
Mull, C. G. (1985). Cretaceous Tectonics, Depositional Cycles, and the Nanushuk Group, Brooks Range and Arctic Slope, Alaska, U.S. Geol. Soc. Bull., 1614, p. 7-36.
NovaCopper Inc. | 27-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
NANA/DOWL Engineers and CH2M Hill (March 2005). Ambler District Access Study, Phase I Summary Route Identification and Screening Analysis, p. 51.
Nauman, C. R. (December 29, 1994). Memo Arctic: Status of Development of Ore Processing.
Oldow, J. S., Seidensticker, C. M., Phelps, J. C., Julian, F. E., Gottschalk, R. R., Boler, K. W., Handschy, J. W., and Ave Lallemant, H. G. (1987). Balanced Cross Sections Through the Central Brooks Range and North Slope, Arctic Alaska, AAPG, p. 19, 8 plates.
Otto, B. R. (2006). Personal Communication.
Proffett, J. M. (1999). Summary of Conclusions on Geology of the Arctic Deposit, AK: Kennecott Minerals Company Unpublished Report.
Randolph, M. P. (August 29, 1990). Internal Kennecott Memo to T. J. Stephenson, Arctic Deposit.
Robertson Geoconsultants Inc. (December 1998). Initial Assessment of Geochemical and Hydrological Conditions at Kennecott’s Arctic Project.
Russell, R. H. (1977). Annual Report, Arctic Deposit: Bear Creek Mining Company Unpublished Report.
Russell, R. H. (1995). Arctic Project 1995 Evaluation Report, Geologic Report: Kennecott Corporation Unpublished Report.
Sawyer, Roger J. (January 15, 1999). Memo to J. Earnshaw, Kennecott Minerals, Arctic-Metallurgy Projections.
Schmidt, J. M. (1983). Geology and Geochemistry of the Arctic Prospect, Ambler District, Alaska: Unpublished Ph.D. dissertation, Stanford University.
Schmidt, J. M. (1986). Stratigraphic Setting and Mineralogy of the Arctic Volcanogenic Massive Sulfide Prospect, Ambler District, Alaska: Economic Geology v. 81. p. 1619-1643.
Schmidt, J. M. (1988). Mineral and Whole Rock Compositions of Seawater-Dominated Hydrothermal Alteration at the Arctic Volcanogenic Massive Sulfide Prospect, Alaska: Economic Geology v.83, p. 822-842.
Shaw, Stone & Webster Management Consultants, Inc. (2006). Mine Power Study Arctic Project – Ambler Mining District, Unpublished Report for Alaska Gold Company, p. 73.
SRK (2012). NI 43-101 Preliminary Economic Assessment, Ambler Project, Kobuk, AK. Prepared by SRK Consulting (U.S.) Inc. for NovaCopper. Report Date March 9, 2012. 276 pages.
NovaCopper Inc. | 27-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Till, A. B., Schmidt, J. M., and Nelson, S. W. (1988). Thrust Involvement of Metamorphic Rocks, Southwestern Brooks Range, Alaska: Geology, v. 16, p. 930-933.
URSA Engineering (1998). Arctic Project Rock Mass Characterization, Prepared for: Kennecott Minerals, Co., Unpublished Report, p. 49.
Vallat, C. (2013a). Memo to NovaCopper Inc. “Historic Pre-NovaGold(2004) Arctic Assay Validations and Updates Within NovaCopper Database”: GeoSpark Consulting Inc. April 22, 2013.
Vallat, C. (2013b). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. Arctic Project, pre-NovaGold (pre-2004)”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. April 22, 2013.
Vallat, C. (2013c). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. 2004 Arctic Project”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. June 6, 2013.
Vallat, C. (2013d). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. 2005 Arctic Project”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. June 6, 2013.
Vallat, C. (2013e). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. 2006 Arctic Project”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. June 6, 2013.
Vallat, C. (2013f). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. 2007 Arctic Project”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. June 6, 2013.
Vallat, C. (2013g). “Quality Assurance and Quality Control Review on Analytical Results Related to the NovaCopper Inc. 2008 Arctic Project”: GeoSpark Consulting Inc. unpublished report for NovaCopper Inc. June 6, 2013.
Vallat, C. (2013h). Memo to NovaCopper Inc. “Arctic Projects 2011 Drill Program Assays Reported in 2013 – QAQC” GeoSpark Consulting Inc. May 31, 2013.
Vogl, J. J., Calvert, A. J., Gans, P. B. (2002). Mechanisms and Timing of Exhumation of Collision-Related Metamorphic Rocks, Southern Brooks Range, Alaska: Insights from Ar (40)/ Ar (39) Thermochronology, Tectonics, v 21, No 3, p. 1-18.
West, A. (2013). Memo to E. Workman & GeoSpark Consulting Inc. “NovaCopper Arctic Project Database Verification”: Internal NovaCopper Inc. Memo, January 8, 2013
Williams, A. (2000). Opportunities in the NANA Region, in: Mining Alaska National Interest Lands Conservation Act (ANILCA)-Twenty Years Later-Abstracts, Alaska Miners Association 2000 Annual Convention, p. 25.
NovaCopper Inc. | 27-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Zieg, G. A., et al. (2005). Ambler Project 2005 Progress Report, Unpublished Internal Report, Alaska Gold Company.
WEBSITE:
http://alaskamininghalloffame.org/inductees/berg.php, February 14, 2012.
ADF&G (2011). Caribou Management Report- Alaska Department of Fish and Game, Division of Wildlife Conservation, Patricia Harper Editor, 2011.
Craig, C. (2012). 2012 UKMP Water Quality Report, Internal Report by NovaCopper US Inc., January, 2012.
Dowl HKM (2013). NovaCopper Final Year-End Report 2012, Consultant Report prepared for NovaCopper under Work Order 60816, March 2013.
Shaw Alaska Inc. (2008). Hydraulics Data Report July 2008 Event Final, Shaw Environmental, Inc.
Shaw Environmental Inc. (2007). Ambler Project, 2007 Environmental Baseline Sampling, Alaska Gold, Inc.
Shaw Environmental Inc. (2008). Water Quality Report July 2008 Event Final, Shaw Environmental, Inc.
Shaw Environmental Inc. (2009). Hydraulics Data Report July 2009 Event Draft, Shaw Environmental, Inc.
Shaw Environmental Inc. (2009). Water Quality Report July 2009 Event Final, Shaw Alaska, Inc.
SRK (2012). NI 43-101 Preliminary Economic Assessment Ambler Project Kobuk, AK, SRK Consulting (U.S.), Inc., March 9, 2012.
Stephen R. Braund & Associates (2012). Ambler Mining District Access Road Subsistence Data Gap Memo, Prepared for the Alaska Department of Transportation and Public Facilities, May 2012.
Tetra Tech (2010a). Arctic Deposit Access Environmental Baseline Data Collection - Hydrology, Ambler Mining District, Alaska, December 1, 2010.
Tetra Tech (2010b). Arctic Deposit Access Environmental Baseline Data Collection - Wetlands & Vegetation, Ambler Mining District, Alaska, November 24, 2010.
Tetra Tech (2011). Arctic Deposit Access Environmental Baseline Data Collection – Aquatics, Ambler Mining District, Alaska, January 20, 2011.
NovaCopper Inc. | 27-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
EBA, A Tetra Tech Company (2013). Arctic Project PEA – Geotechnical Open Pit Design Criteria. June 17, 2013.
27.4 | CAPITAL COST ESTIMATE |
Adventurine Engineering Inc., Mine and Mill Equipment Costs, An Estimators Guide (2012) published by InfoMine USA Inc., CostMine Division.
Page, John S., Estimator’s General Construction Man-Hour Manual, Second Edition, 1999, Butterworth-Hinemann, ISBN-12: 978-0-87201-320-9.
Page, John S., Estimator’s Equipment Installation Man-Hour Manual, Third Edition, 1999, Gulf Professional Publishing, ISBN-13: 978-0-88415-287-3.
Page, John S., Estimator’s Piping Man-Hour Manual, Fifth Edition, 1999, Butterworth-Heinemann/(originally published by Gulf Publishing Company), ISBN-13: 978-0-88415-259-0.
RSMeans Costworks, Reed Construciton Data, Heavy Constuciton Cost Data (2013 Cost Data) Electronic Database.
Salzere, Krist Noyes (2010), Canadian Mines Salaries, Wages & Benefits, 2010 Survey Results, InfoMine USA, Inc.
Stephen R. Braund & Associates (2012). Ambler Mining District Access Road Subsistence Data Gap Memo, Prepared for the Alaska Department of Transportation and Public Facilities, May 2012.
NovaCopper Inc. Second Quarter 2013 Management’s Discussion & Analysis, May 31, 2013.http://www.novacopper.com/i/pdf/financials/2013-Q2-MDA.pdf
27.6 | ELECTRICAL POWER GENERATION |
Interior Energy Project Feasibility Report. Proposed Project – North Slope LNG Plant July 2013. Report prepared by the Alaska Industrial Development and Export Authority (AIDEA) and Alaska Energy Authority.
NovaCopper Inc. | 27-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.0 | CERTIFICATESOFQUALIFIEDPERSONS |
28.1 | MICHAELF.O’BRIEN, M.SC., PR.SCI.NAT, FGSSA, FAUSIMM,FSAIMM |
I, Michael F. O’Brien, M.Sc., Pr. Sci. Nat., FGSSA, FAusIMM, FSAIMM, of Vancouver, British Columbia, do hereby certify:
| • | I am a Chief Geologist with Tetra Tech WEI Inc. with a business address at 800- 555 West Hastings Street, Vancouver, British Columbia, V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of the University of Natal (B.Sc Hons. Geology, 1978). I am a registered Professional Natural Scientist (Geological Scientist) in good standing of the South African Council for Natural Scientific Professions (South Africa, 400295/87). My relevant experience is 33 years of experience in operations, mineral project assessment and I have the experience relevant to Mineral Resource estimation of metal deposits. I have estimated Mineral Resources for greenstone-hosted gold (Cuiaba in Minas Gerais Brazil), diatreme complex epithermal gold deposits (Cripple Creek in Colorado), porphyry copper-gold (Pebble Mine in Alaska) and shear zone-hosted deposits (Mongbwalu in the Dominican Republic of Congo). I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”) under the Accepted Foreign Associations and Membership Designations (Appendix A). |
| | |
| • | My most recent personal inspection of the Property was June 19, 2013 for three days. |
| | |
| • | I am responsible for Sections 1.1 to 1.4, 1.13, 1.14, 2.0, 3.0, 4.0 to 12.0, 14.0, 23.0, 24.0, 25.1 to 25.4, 26.1, 26.2, 27.1, and 28.1 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the technical report not misleading. |
NovaCopper Inc. | 28-1 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
Original document signed and sealed by
Michael F. O’Brien, M.Sc., Pr.Sci.Nat.,
FGSSA, FAusIMM, FSAIMM
Michael F. O’Brien, M.Sc.,
Pr.Sci.Nat., FGSSA,
FAusIMM, FSAIMM
Chief Geologist
Tetra Tech WEI Inc.
NovaCopper Inc. | 28-2 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.2 | JIANHUI(JOHN) HUANG, PH.D., P.ENG. |
I, Jianhui (John) Huang, Ph.D., P.Eng., of Burnaby, British Columbia, do hereby certify:
| • | I am a Senior Metallurgist with Tetra Tech WEI Inc. with a business address at 800-555 West Hastings Street, Vancouver, British Columbia V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of North-East University (B.Eng., 1982), Beijing General Research Institute for Non-ferrous Metals (M.Eng., 1988), and Birmingham University (Ph.D., 2000). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia (License #30898). My relevant experience with respect to mineral engineering includes more than 30 years of involvement in mineral process for metal recovery from various base metal, gold, silver and rare metal ores. I have relevant experience in copper, lead, zinc, silver and gold recovery from various ores, including from multi-metal massive and semi-massive sulphide mineralization. Projects include the Fuping Gold-Silver-Copper-Lead-Zinc Massive/Semi-Massive Ore Project, the Tulsequah Chief Project and the Bellekeno Project. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 1.5, 1.7, 1.11, 13.0, 17.0, 18.3, 19.0, 21.1, 21.5.1, 21.5.3, 21.5.4, 25.5, 26.3, 26.4, 26.6.3, 27.6, and 28.2 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
Original document signed and sealed by
Jianhui (John) Huang, Ph.D., P.Eng.
Jianhui (John) Huang, Ph.D., P.Eng.
Senior Metallurgist
Tetra Tech WEI Inc.
NovaCopper Inc. | 28-3 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.3 | SABRYABDELHAFEZ, PH.D., P.ENG. |
I, Sabry Abdel Hafez, Ph.D., P.Eng., of Vancouver, British Columbia, do hereby certify:
| • | I am a Senior Mining Engineer with Tetra Tech WEI Inc. with a business address at 800-555 West Hastings Street, Vancouver, British Columbia, V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of Assiut University (B.Sc Mining Engineering, 1991; M.Sc. in Mining Engineering, 1996; Ph.D. in Mineral Economics, 2000). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia (License #34975). My relevant experience is in mine evaluation. I have more than 19 years of experience in the evaluation of mining projects, advanced financial analysis, and mine planning and optimization. My capabilities range from the conventional mine planning and evaluation to the advanced simulation-based techniques that incorporate both market and geological uncertainties. I have been involved in the technical studies of several base metals, gold, coal, and aggregate mining projects in Canada and abroad. I have recently been involved in the technical reports for the Copper Fox’s Schaft Creek project feasibility study, Pretium Resources’ Brucejack project feasibility study, AQM’s Zafranal PEA, Castle Resources’ Granduc project PEA study and Seabridge’s KSM project prefeasibility study. I am a “Qualified Person” for purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | My most recent personal inspection of the Property was June 19, 2013 for three days. |
| | |
| • | I am responsible for Sections 1.6, 1.12, 15.0, 16.0, 18.7, 21.4, 21.5.2, 21.5.6, 22.0, 25.6, 25.10, 26.5, 26.8, 27.3, 27.5, and 28.3 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
NovaCopper Inc. | 28-4 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Original document signed and sealed by
Sabry Abdel Hafez, Ph.D., P.Eng.
Sabry Abdel Hafez, Ph.D., P.Eng.
Senior Mining Engineer
Tetra Tech WEI Inc.
28.4 | HASSANGHAFFARI, P.ENG. |
I, Hassan Ghaffari, P.Eng., of Vancouver, British Columbia, do hereby certify:
| • | I am the Director of Metallurgy with Tetra Tech WEI Inc. with a business address at 800-555 West Hastings Street, Vancouver, British Columbia, V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of the University of Tehran (M.A.Sc., Mining Engineering, 1990) and the University of British Columbia (M.A.Sc., Mineral Process Engineering, 2004). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia (License #30408). My relevant experience includes 23 years of experience in mining and plant operation, project studies, management, and engineering. As the lead metallurgist for the Pebble Copper/Gold Moly Project in Alaska, I am coordinating all metallurgical test work and preparing and peer reviewing the technical report and the operating and capital costs of the plant and infrastructure for both the scoping and prefeasibility studies. For the Ajax Copper-Gold Project in BC, I was the Project Manager responsible for the process, infrastructure and overall management of the 60,000 t/d mill. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 1.8 (except 1.8.2), 18.1, 18.4 to 18.6, 18.8, 18.12 to 18.14, 25.7, 26.6 (except 26.6.2 to 26.6.5) and 28.4 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
NovaCopper Inc. | 28-5 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
Original document signed and sealed by
Hassan Ghaffari, P.Eng.
Hassan Ghaffari, P.Eng.
Director of Metallurgy
Tetra Tech WEI Inc.
NovaCopper Inc. | 28-6 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.5 | HARVEYWAYNESTOYKO, P.ENG. |
I, Harvey Wayne Stoyko, P.Eng., of Vancouver, British Columbia, do hereby certify:
| • | I am the Manager of Estimating with Tetra Tech WEI Inc. with a business address at 800-555 West Hastings Street, Vancouver, British Columbia V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of the University of Saskatchewan (B.Sc. Mechanical Engineering, 1985). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia (License #17092). My relevant experience with respect to mine development and costing includes over 25 years of combined mining experience. This includes capital cost engineering/cost control for both greenfield and brownfield studies, and acquisitions/mergers or development of properties (construction) with Placer Dome. I have also been involved as an Owners representative with the planning, costing/cost control and execution of mine/concentrate handling facilities including plant, road, rail and port with the Port of Vancouver (Kinder Morgan) for Comino’s Red Dog Project. At Tetra Tech, I have directed the preparation of capital cost estimates for technical studies and I am responsible for project controls for ongoing studies and EPCM projects. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 1.10, 21.2 to 21.3, 26.6, 27.4 and 28.5 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
Original document signed and sealed by
Harvey Wayne Stoyko, P.Eng.
Harvey Wayne Stoyko, P.Eng.
Manager of Estimating
Tetra Tech WEI Inc.
NovaCopper Inc. | 28-7 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
I, Michael Chin, P.Eng., of Vancouver, British Columbia, do hereby certify:
| • | I am a Civil Engineer with Tetra Tech WEI Inc. with a business address at 800- 555 West Hastings Street, Vancouver, British Columbia, V6B 1M1. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of the University of Alberta (Bachelor of Science in Civil Engineering, 1985). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia (License #17172). My relevant experience is 26 years of civil engineering design and construction for mines, power plants, highways, and other heavy civil projects. Projects include the Zafranal greenfield copper gold mine in Peru and the Brucejack greenfield underground gold mine in Stewart, BC, Canada. I was also the Civil Project Engineer for the Eskay Creek Mine in Smithers, BC, Canada and the Willow Creek Mine in Chetwynd, BC, Canada. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 18.2.1, 18.2.3, and 28.6 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for have been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contain all scientific and technical information that is required to be disclosed to make the technical report not misleading. |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
Original document signed and sealed by
Michael Chin, P.Eng.
Michael Chin, P.Eng.
Civil Engineer
Tetra Tech WEI Inc.
NovaCopper Inc. | 28-8 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.7 | GRAHAMWILKINS, P.ENG. |
I, Graham Wilkins, P.Eng., of Vancouver, British Columbia, do hereby certify:
| • | I am a Senior Transportation Engineer with EBA, A Tetra Tech Company with a business address at Oceanic Plaza, 9thFloor, 1066 West Hastings Street, Vancouver, British Columbia, V6E 3X2. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of Carleton University (B.Eng., Civil Engineering, 1986). I am a member in good standing of the Association of Professional Engineers and Geoscientists of British Columbia, License #16255. I have 27 years relevant transportation experience. I have worked on projects from the initial planning stages right through to detailed design and construction completion. My transportation roles are comprehensive including construction supervision, design, specs and project management. I have worked on resource and mining projects throughout BC, Alaska, Yukon, NWT and Nunavut. I was involved in the planning and design of the transportation infrastructure to the Kiggavik Mine near Baker Lake, Nunavut. Elements of the infrastructure included 100 km of an all-weather road and an option of a 100 km long winter road, 400 m bridge, port facility and an airstrip. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | My most recent personal inspection of the Property was in the fall of 2011 for one day. |
| | |
| • | I am responsible for Sections 18.2.2, 18.2.4, 26.6.2, 26.6.4, and 28.7 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have prior involvement with the Property that is the subject of the Technical Report. I was a Qualified Person for NovaGold’s 2011 technical report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for has been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September, 2013 at Vancouver, British Columbia
NovaCopper Inc. | 28-9 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
Original document signed and sealed by
Graham Wilkins, P.Eng.
Graham Wilkins, P.Eng.
Senior Transportation Engineer
EBA, A Tetra Tech Company
NovaCopper Inc. | 28-10 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
28.8 | MARVINSILVA, PH.D., PE, P.ENG. |
I, Marvin Silva, Ph.D., PE, P.Eng., of Tucson, Arizona, do hereby certify:
| • | I am a Senior Geotechnical Engineer with Tetra Tech Inc. with a business address at 3031 West Ina Road, Tucson, Arizona 85741. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of the National Autonomous University of Nicaragua (B.Sc Agricultural Engineering, 1981); the Institute of Odessa in Ukraine (M.Sc. Water Resources Engineering, 1985); and the University of Alberta (Ph.D. Geoenvironmental Engineering, 1999). I am a member in good standing of the Association of Professional Engineers and Geoscientists of Alberta (License #52477). My relevant experience with respect to geotechnical engineering includes 21 years of experience in mining and infrastructure projects in Canada and the United States of America, including 7.5 years dedicated to research of mine waste tailings and design of tailings storage facilities. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 1.8.2, 18.9 to 18.11, 21.5.5, 25.8, 26.5.5, and 28.8 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for has been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September 2013 at Tucson, Arizona
Original document signed and sealed by
Marvin Silva, Ph.D., PE, P.Eng.
Marvin Silva, Ph.D., PE, P.Eng.
Senior Geotechnical Engineer
Tetra Tech Inc.
NovaCopper Inc. | 28-11 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
I, Jack DiMarchi, CPG, Fairbanks, Alaska, do hereby certify:
| • | I am a Project Manager/Senior Scientist with Tetra Tech Inc. with a business address at 615 Bidwell Avenue, Box 8, Fairbanks, Alaska, 99701. |
| | |
| • | This certificate applies to the technical report entitled “Preliminary Economic Assessment Report on the Arctic Project, Ambler Mining District, Northwest Alaska”, dated September 12, 2013 (the “Technical Report”). |
| | |
| • | I am a graduate of Colorado State University (BS Geology 1978). I am a member in good standing of the American Institute of Professional Geologists, Certification #9217. My relevant experience is having served in several capacities in mine development, permitting and regulating mines including 10 years as Chief Geologist with Tech Resources on the Pogo Project, 3.5 years as Large Mine Coordinator with the State of Alaska Department of Natural Resources Office of Permitting and Project Management and 1.5 years with Tetra Tech responsible for authoring Environmental Chapters in other 43-101 reports including the Sun Project, Oracle Ridge Project and Rosemont Copper Project and other environmental permitting work on projects that include the Livengood Project. I am a “Qualified Person” for the purposes of National Instrument 43-101 (the “Instrument”). |
| | |
| • | I have not completed a personal inspection of the Property. |
| | |
| • | I am responsible for Sections 1.9, 20.0, 25.9, 26.7, 27.2, and 28.9 of the Technical Report. |
| | |
| • | I am independent of NovaCopper Inc. as defined by Section 1.5 of the Instrument. |
| | |
| • | I have no prior involvement with the Property that is the subject of the Technical Report. |
| | |
| • | I have read the Instrument and the sections of the Technical Report that I am responsible for has been prepared in compliance with the Instrument. |
| | |
| • | As of the date of this certificate, to the best of my knowledge, information and belief, the sections of the Technical Report that I am responsible for contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading. |
Signed and dated this 12thday of September, 2013 at Fairbanks, Alaska
Original document signed and sealed by
Jack DiMarchi, CPG
Jack DiMarchi, CPG
Project Manager/Senior Scientist Tetra Tech Inc.
NovaCopper Inc. | 28-12 | 1297650100-REP-R0002-03 |
Preliminary Economic Assessment Report on the Arctic | | |
Project, Ambler Mining District, Northwest Alaska | | |
A P P E N D I X A |
|
CLAIMS MAP AND CLAIMS LIST |
Claim No. | Claim Name | Status | Grant Date | Expiry Date | Acres | Govt Office | T. | R. | Sec. | Qtr. |
540543 | Arctic 40A | Granted | August 29, 1990 | November 30, 2013 | 2 | Kotzebue | 21N | 11E | 35 | SW |
540544 | Arctic 496A | Granted | August 29, 1990 | November 30, 2013 | 2 | Kotzebue | 21N | 11E | 34 | SE |
540545 | Arctic 1001 | Granted | July 16, 1984 | November 30, 2013 | 8 | Kotzebue | 21N | 11E | 34 | SE |
540546 | Arctic 1002 | Granted | July 16, 1984 | November 30, 2013 | 8 | Kotzebue | 21N | 11E | 34 | SE & SW |
540549 | Arctic 1005 | Granted | September 2, 1990 | November 30, 2013 | 6 | Kotzebue | 21N | 11E | 35 | SW |
546144 | SC 24 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW & SE |
546145 | SC 25 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW, SE, NW & NE |
546146 | SC 26 | Granted | June 28, 1995 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NW & NE |
546147 | SC 34 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SE |
546148 | SC 35 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SE & NE |
546149 | SC 36 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NE |
546150 | SC 44 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15; 16 | SW; SE |
546151 | SC 45 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15; 16 | SW & NW; SE & NE |
546152 | SC 46 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15; 16 | NW; NE |
546153 | SC 54 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW |
546154 | SC 55 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW & NW |
546155 | SC 56 | Granted | June 29, 1995 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NW |
546156 | SC 64 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW & SE |
546157 | SC 65 | Granted | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW, SE, NW & NE |
546158 | SC 66 | Granted | June 29, 1995 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NW & NE |
590853 | AM 63-165 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NW |
590854 | AM 63-166 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NW |
590855 | AM 63-167 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NE |
590856 | AM 63-168 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NE |
590857 | AM 63-169 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NW |
590858 | AM 63-170 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NW |
590859 | AM 63-171 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NE |
590860 | AM 63-172 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NE |
590874 | AM 64-165 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NW |
590875 | AM 64-166 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NW |
590876 | AM 64-167 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NE |
590877 | AM 64-168 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 14 | NE |
590878 | AM 64-169 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NW |
590879 | AM 64-170 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NW |
590880 | AM 64-171 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NE |
590881 | AM 64-172 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 13 | NE |
590895 | AM 65-165 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SW |
590896 | AM 65-166 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SW |
590897 | AM 65-167 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SE |
590898 | AM 65-168 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SE |
590899 | AM 65-169 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SW |
590900 | AM 65-170 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SW |
590901 | AM 65-171 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SE |
590902 | AM 65-172 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SE |
590916 | AM 66-165 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SW |
590917 | AM 66-166 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SW |
590918 | AM 66-167 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SE |
590919 | AM 66-168 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | SE |
590920 | AM 66-169 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SW |
590921 | AM 66-170 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SW |
590922 | AM 66-171 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SE |
590923 | AM 66-172 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | SE |
590940 | AM 67-165 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NW |
590941 | AM 67-166 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NW |
590942 | AM 67-167 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NE |
590943 | AM 67-168 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NE |
590944 | AM 67-169 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NW |
590945 | AM 67-170 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NW |
590946 | AM 67-171 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NE |
590947 | AM 67-172 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NE |
590998 | AM 56-186 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 27 | NW |
590999 | AM 56-187 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 27 | NE |
591000 | AM 56-188 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 27 | NE |
591001 | AM 56-189 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 26 | NW |
591002 | AM 56-190 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 26 | NW |
591003 | AM 56-191 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 26 | NE |
591004 | AM 56-192 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 26 | NE |
591005 | AM 56-193 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NW |
591006 | AM 56-194 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NW |
591007 | AM 56-195 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NE |
591008 | AM 57-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 19 | SE |
591009 | AM 57-177 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SW |
591010 | AM 57-178 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SW |
591011 | AM 57-179 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SE |
591012 | AM 57-180 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SE |
591013 | AM 57-181 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SW |
591014 | AM 57-182 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SW |
591015 | AM 57-183 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SE |
591016 | AM 57-184 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SE |
591017 | AM 57-185 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SW |
591018 | AM 57-186 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SW |
591019 | AM 57-187 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SE |
591020 | AM 57-188 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SE |
591021 | AM 57-189 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SW |
591022 | AM 57-190 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SW |
591023 | AM 57-191 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SE |
591024 | AM 57-192 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SE |
591025 | AM 57-193 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SW |
591026 | AM 57-194 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SW |
591027 | AM 57-195 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SE |
591028 | AM 58-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 19 | SE |
591029 | AM 58-177 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SW |
591030 | AM 58-178 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SW |
591031 | AM 58-179 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SE |
591032 | AM 58-180 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | SE |
591033 | AM 58-181 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SW |
591034 | AM 58-182 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SW |
591035 | AM 58-183 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SE |
591036 | AM 58-184 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | SE |
591037 | AM 58-185 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SW |
591038 | AM 58-186 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SW |
591039 | AM 58-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SE |
591040 | AM 58-188 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | SE |
591041 | AM 58-189 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SW |
591042 | AM 58-190 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SW |
591043 | AM 58-191 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SE |
591044 | AM 58-192 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | SE |
591045 | AM 58-193 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SW |
591046 | AM 58-194 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SW |
591047 | AM 59-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 19 | NE |
591048 | AM 59-177 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NW |
591049 | AM 59-178 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NW |
591050 | AM 59-179 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NE |
591051 | AM 59-180 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NE |
591052 | AM 59-181 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NW |
591053 | AM 59-182 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NW |
591054 | AM 59-183 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NE |
591055 | AM 59-184 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NE |
591056 | AM 59-185 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NW |
591057 | AM 59-186 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NW |
591058 | AM 59-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NE |
591059 | AM 59-188 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NE |
591060 | AM 59-189 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NW |
591061 | AM 59-190 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NW |
591062 | AM 59-191 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NE |
591063 | AM 59-192 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NE |
591064 | AM 59-193 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NW |
591065 | AM 60-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 19 | NE |
591066 | AM 60-177 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NW |
591067 | AM 60-178 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NW |
591068 | AM 60-179 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NE |
591069 | AM 60-180 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 20 | NE |
591070 | AM 60-181 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NW |
591071 | AM 60-182 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NW |
591072 | AM 60-183 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NE |
591073 | AM 60-184 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 21 | NE |
591074 | AM 60-185 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NW |
591075 | AM 60-186 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NW |
591076 | AM 60-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NE |
591077 | AM 60-188 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 22 | NE |
591078 | AM 60-189 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NW |
591079 | AM 60-190 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NW |
591080 | AM 60-191 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NE |
591081 | AM 60-192 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 23 | NE |
591082 | AM 60-193 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NW |
591083 | AM 61-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | SE |
591084 | AM 61-177 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SW |
591085 | AM 61-178 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SW |
591086 | AM 61-179 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SE |
591087 | AM 61-180 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SE |
591088 | AM 61-181 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW |
591089 | AM 61-182 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW |
591090 | AM 61-183 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SE |
591091 | AM 61-184 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SE |
591092 | AM 61-185 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW |
591093 | AM 61-186 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SW |
591094 | AM 61-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SE |
591095 | AM 61-188 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SE |
591096 | AM 61-189 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SW |
591097 | AM 61-190 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SW |
591098 | AM 61-191 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SE |
591099 | AM 61-192 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SE |
591100 | AM 61-193 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SW |
591101 | AM 62-176 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | SE |
591102 | AM 62-177 | Granted | September 9, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SW |
591103 | AM 62-178 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SW |
591104 | AM 62-179 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SE |
591105 | AM 62-180 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | SE |
591106 | AM 62-181 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW |
591107 | AM 62-182 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | SW |
591108 | AM 62-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SE |
591109 | AM 62-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | SE |
591110 | AM 62-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SW |
591111 | AM 62-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SW |
591112 | AM 62-191 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SE |
591113 | AM 62-192 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | SE |
591114 | AM 62-193 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SW |
591115 | AM 63-173 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NW |
591116 | AM 63-174 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NW |
591117 | AM 63-175 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NE |
591118 | AM 63-176 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NE |
591119 | AM 63-177 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NW |
591120 | AM 63-178 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NW |
591121 | AM 63-179 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NE |
591122 | AM 63-180 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NE |
591123 | AM 63-181 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NW |
591124 | AM 63-182 | Granted | September 5, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NW |
591125 | AM 63-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NE |
591126 | AM 63-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NE |
591127 | AM 63-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NW |
591128 | AM 63-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NW |
591129 | AM 63-191 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NE |
591130 | AM 63-192 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NE |
591131 | AM 63-193 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NW |
591132 | AM 64-173 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NW |
591133 | AM 64-174 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NW |
591134 | AM 64-175 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NE |
591135 | AM 64-176 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 18 | NE |
591136 | AM 64-177 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NW |
591137 | AM 64-178 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NW |
591138 | AM 64-179 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NE |
591139 | AM 64-180 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 17 | NE |
591140 | AM 64-181 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NW |
591141 | AM 64-182 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NW |
591142 | AM 64-183 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NE |
591143 | AM 64-184 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 16 | NE |
591144 | AM 64-185 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NW |
591145 | AM 64-186 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NW |
591146 | AM 64-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NE |
591147 | AM 64-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 15 | NE |
591148 | AM 64-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NW |
591149 | AM 64-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NW |
591150 | AM 64-191 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NE |
591151 | AM 64-192 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 14 | NE |
591152 | AM 64-193 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NW |
591153 | AM 65-173 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SW |
591154 | AM 65-174 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SW |
591155 | AM 65-175 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SE |
591156 | AM 65-176 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SE |
591157 | AM 65-177 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SW |
591158 | AM 65-178 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SW |
591159 | AM 65-179 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SE |
591160 | AM 65-180 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SE |
591161 | AM 65-181 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SW |
591162 | AM 65-182 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SW |
591163 | AM 65-183 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SE |
591164 | AM 65-184 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SE |
591165 | AM 65-185 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SW |
591166 | AM 65-186 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SW |
591167 | AM 65-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SE |
591168 | AM 65-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SE |
591169 | AM 65-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SW |
591170 | AM 65-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SW |
591171 | AM 65-191 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SE |
591172 | AM 65-192 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SE |
591173 | AM 65-193 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SW |
591174 | AM 66-173 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SW |
591175 | AM 66-174 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SW |
591176 | AM 66-175 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SE |
591177 | AM 66-176 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | SE |
591178 | AM 66-177 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SW |
591179 | AM 66-178 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SW |
591180 | AM 66-179 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SE |
591181 | AM 66-180 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | SE |
591182 | AM 66-181 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SW |
591183 | AM 66-182 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SW |
591184 | AM 66-183 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SE |
591185 | AM 66-184 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | SE |
591186 | AM 66-185 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SW |
591187 | AM 66-186 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SW |
591188 | AM 66-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SE |
591189 | AM 66-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | SE |
591190 | AM 66-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SW |
591191 | AM 66-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SW |
591192 | AM 66-191 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SE |
591193 | AM 66-192 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | SE |
591194 | AM 66-193 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SW |
591195 | AM 67-173 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NW |
591196 | AM 67-174 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NW |
591197 | AM 67-175 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NE |
591198 | AM 67-176 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NE |
591199 | AM 67-177 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NW |
591200 | AM 67-178 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NW |
591201 | AM 67-179 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NE |
591202 | AM 67-180 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NE |
591203 | AM 67-181 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NW |
591204 | AM 67-182 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NW |
591205 | AM 67-183 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NE |
591206 | AM 67-184 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NE |
591207 | AM 67-185 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NW |
591208 | AM 67-186 | Granted | September 6, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NW |
591209 | AM 67-187 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NE |
591210 | AM 67-188 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NE |
591211 | AM 67-189 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NW |
591212 | AM 67-190 | Granted | September 10, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NW |
591213 | AM 67-191 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NE |
591214 | AM 67-192 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NE |
591215 | AM 67-193 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | NW |
591216 | AM 67-194 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | NW |
591217 | AM 67-195 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | NE |
591218 | AM 67-196 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | NE |
591219 | AM 49-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SW |
591220 | AM 49-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SE |
591221 | AM 49-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SE |
591222 | AM 49-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | SW |
591223 | AM 49-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | SW |
591224 | AM 49-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SW |
591225 | AM 49-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SE |
591226 | AM 49-216 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SE |
591227 | AM 49-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SW |
591228 | AM 49-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SW |
591229 | AM 49-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SE |
591230 | AM 49-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SE |
591231 | AM 50-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SW |
591232 | AM 50-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SE |
591233 | AM 50-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | SE |
591234 | AM 50-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | SW |
591235 | AM 50-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | SW |
591236 | AM 50-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | SE |
591237 | AM 50-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SW |
591238 | AM 50-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SW |
591239 | AM 50-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SE |
591240 | AM 50-216 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | SE |
591241 | AM 50-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SW |
591242 | AM 50-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SW |
591243 | AM 50-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SE |
591244 | AM 50-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | SE |
591245 | AM 51-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NW |
591246 | AM 51-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NE |
591247 | AM 51-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NE |
591248 | AM 51-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NW |
591249 | AM 51-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NW |
591250 | AM 51-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NE |
591251 | AM 51-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NE |
591252 | AM 51-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NW |
591253 | AM 51-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NW |
591254 | AM 51-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NE |
591255 | AM 51-216 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NE |
591256 | AM 51-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NW |
591257 | AM 51-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NW |
591258 | AM 51-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NE |
591259 | AM 51-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NE |
591260 | AM 52-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NW |
591261 | AM 52-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NE |
591262 | AM 52-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 33 | NE |
591263 | AM 52-209 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NW |
591264 | AM 52-210 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NW |
591265 | AM 52-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NE |
591266 | AM 52-212 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 34 | NE |
591267 | AM 52-213 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NW |
591268 | AM 52-214 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NW |
591269 | AM 52-215 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NE |
591270 | AM 52-216 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 35 | NE |
591271 | AM 52-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NW |
591272 | AM 52-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NW |
591273 | AM 52-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NE |
591274 | AM 52-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 36 | NE |
591275 | AM 53-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SW |
591276 | AM 53-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SE |
591277 | AM 53-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SE |
591278 | AM 53-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SW |
591279 | AM 53-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SW |
591280 | AM 53-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SE |
591281 | AM 53-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SE |
591282 | AM 53-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SW |
591283 | AM 53-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SW |
591284 | AM 53-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SE |
591285 | AM 53-216 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SE |
591286 | AM 53-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SW |
591287 | AM 53-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SW |
591288 | AM 53-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SE |
591289 | AM 53-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SE |
591290 | AM 54-206 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SW |
591291 | AM 54-207 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SE |
591292 | AM 54-208 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | SE |
591293 | AM 54-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SW |
591294 | AM 54-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SW |
591295 | AM 54-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SE |
591296 | AM 54-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | SE |
591297 | AM 54-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SW |
591298 | AM 54-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SW |
591299 | AM 54-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SE |
591300 | AM 54-216 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | SE |
591301 | AM 54-217 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SW |
591302 | AM 54-218 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SW |
591303 | AM 54-219 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SE |
591304 | AM 54-220 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | SE |
591305 | AM 55-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NW |
591306 | AM 55-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NE |
591307 | AM 55-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NE |
591308 | AM 55-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NW |
591309 | AM 55-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NW |
591310 | AM 55-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NE |
591311 | AM 55-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NE |
591312 | AM 55-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NW |
591313 | AM 55-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NW |
591314 | AM 55-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NE |
591315 | AM 55-216 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NE |
591316 | AM 55-217 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NW |
591317 | AM 55-218 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NW |
591318 | AM 55-219 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NE |
591319 | AM 55-220 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NE |
591320 | AM 56-206 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NW |
591321 | AM 56-207 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NE |
591322 | AM 56-208 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NE |
591323 | AM 56-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NW |
591324 | AM 56-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NW |
591325 | AM 56-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NE |
591326 | AM 56-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 27 | NE |
591327 | AM 56-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NW |
591328 | AM 56-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NW |
591329 | AM 56-215 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NE |
591330 | AM 56-216 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 26 | NE |
591331 | AM 56-217 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NW |
591332 | AM 56-218 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NW |
591333 | AM 56-219 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NE |
591334 | AM 56-220 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 25 | NE |
591335 | AM 57-206 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SW |
591336 | AM 57-207 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SE |
591337 | AM 57-208 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SE |
591338 | AM 57-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SW |
591339 | AM 57-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SW |
591340 | AM 57-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SE |
591341 | AM 57-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SE |
591342 | AM 57-213 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SW |
591343 | AM 57-214 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SW |
591344 | AM 57-215 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SE |
591345 | AM 57-216 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SE |
591346 | AM 57-217 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SW |
591347 | AM 57-218 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SW |
591348 | AM 57-219 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SE |
591349 | AM 57-220 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SE |
591350 | AM 58-206 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SW |
591351 | AM 58-207 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SE |
591352 | AM 58-208 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SE |
591353 | AM 58-209 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SW |
591354 | AM 58-210 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SW |
591355 | AM 58-211 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SE |
591356 | AM 58-212 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | SE |
591357 | AM 58-213 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SW |
591358 | AM 58-214 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SW |
591359 | AM 58-215 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SE |
591360 | AM 58-216 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | SE |
591361 | AM 58-217 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SW |
591362 | AM 58-218 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SW |
591363 | AM 58-219 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SE |
591364 | AM 58-220 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | SE |
591365 | AM 59-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NW |
591366 | AM 59-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NE |
591367 | AM 59-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NE |
591368 | AM 59-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NW |
591369 | AM 59-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NW |
591370 | AM 59-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NE |
591371 | AM 59-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NE |
591372 | AM 59-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NW |
591373 | AM 59-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NW |
591374 | AM 59-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NE |
591375 | AM 59-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NE |
591376 | AM 59-213 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NW |
591377 | AM 59-214 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NW |
591378 | AM 59-215 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NE |
591379 | AM 59-216 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NE |
591380 | AM 59-217 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | NW |
591381 | AM 59-218 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | NW |
591382 | AM 60-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NW |
591383 | AM 60-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NE |
591384 | AM 60-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NE |
591385 | AM 60-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NW |
591386 | AM 60-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NW |
591387 | AM 60-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NE |
591388 | AM 60-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | NE |
591389 | AM 60-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NW |
591390 | AM 60-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NW |
591391 | AM 60-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NE |
591392 | AM 60-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 22 | NE |
591393 | AM 60-213 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NW |
591394 | AM 60-214 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NW |
591395 | AM 60-215 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NE |
591396 | AM 60-216 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 23 | NE |
591397 | AM 60-217 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | NW |
591398 | AM 60-218 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 24 | NW |
591399 | AM 61-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SW |
591400 | AM 61-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SE |
591401 | AM 61-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SE |
591402 | AM 61-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SW |
591403 | AM 61-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SW |
591404 | AM 61-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SE |
591405 | AM 61-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SE |
591406 | AM 61-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SW |
591407 | AM 61-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SW |
591408 | AM 61-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SE |
591409 | AM 61-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SE |
591410 | AM 61-213 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SW |
591411 | AM 61-214 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SW |
591412 | AM 61-215 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SE |
591413 | AM 61-216 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SE |
591414 | AM 61-217 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 13 | SW |
591415 | AM 61-218 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 13 | SW |
591416 | AM 62-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SW |
591417 | AM 62-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SE |
591418 | AM 62-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SE |
591419 | AM 62-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SW |
591420 | AM 62-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SW |
591421 | AM 62-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SE |
591422 | AM 62-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | SE |
591423 | AM 62-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SW |
591424 | AM 62-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SW |
591425 | AM 62-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SE |
591426 | AM 62-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | SE |
591427 | AM 62-213 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SW |
591428 | AM 62-214 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SW |
591429 | AM 62-215 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SE |
591430 | AM 62-216 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 14 | SE |
591431 | AM 62-217 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 13 | SW |
591432 | AM 62-218 | Granted | September 19, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 13 | SW |
591433 | AM 63-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NW |
591434 | AM 63-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NE |
591435 | AM 63-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NE |
591436 | AM 63-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NW |
591437 | AM 63-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NW |
591438 | AM 63-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NE |
591439 | AM 63-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NE |
591440 | AM 63-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NW |
591441 | AM 63-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NW |
591442 | AM 63-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NE |
591443 | AM 63-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NE |
591444 | AM 64-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NW |
591445 | AM 64-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NE |
591446 | AM 64-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NE |
591447 | AM 64-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NW |
591448 | AM 64-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NW |
591449 | AM 64-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NE |
591450 | AM 64-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 16 | NE |
591451 | AM 64-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NW |
591452 | AM 64-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NW |
591453 | AM 64-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NE |
591454 | AM 64-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 15 | NE |
591455 | AM 65-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SW |
591456 | AM 65-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SE |
591457 | AM 65-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SE |
591458 | AM 65-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SW |
591459 | AM 65-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SW |
591460 | AM 65-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SE |
591461 | AM 65-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SE |
591462 | AM 65-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SW |
591463 | AM 65-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SW |
591464 | AM 65-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SE |
591465 | AM 65-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SE |
591466 | AM 66-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SW |
591467 | AM 66-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SE |
591468 | AM 66-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SE |
591469 | AM 66-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SW |
591470 | AM 66-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SW |
591471 | AM 66-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SE |
591472 | AM 66-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | SE |
591473 | AM 66-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SW |
591474 | AM 66-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SW |
591475 | AM 66-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SE |
591476 | AM 66-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | SE |
591477 | AM 67-197 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | NW |
591478 | AM 67-198 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | NW |
591479 | AM 67-199 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | NE |
591480 | AM 67-200 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | NE |
591481 | AM 67-201 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | NW |
591482 | AM 67-202 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | NW |
591483 | AM 67-203 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | NE |
591484 | AM 67-204 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | NE |
591485 | AM 67-205 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | NW |
591486 | AM 67-206 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | NW |
591487 | AM 67-207 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | NE |
591488 | AM 67-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | NE |
591489 | AM 67-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NW |
591490 | AM 67-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NW |
591491 | AM 67-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NE |
591492 | AM 67-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NE |
591493 | AM 68-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 9 | NE |
591494 | AM 68-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NW |
591495 | AM 68-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NW |
591496 | AM 68-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NE |
591497 | AM 68-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 10 | NE |
591498 | AM 69-208 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 4 | SE |
591499 | AM 69-209 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 3 | SW |
591500 | AM 69-210 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 3 | SW |
591501 | AM 69-211 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 3 | SE |
591502 | AM 69-212 | Granted | September 8, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 3 | SE |
591503 | AM 49-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SW |
591504 | AM 49-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SW |
591505 | AM 49-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SE |
591506 | AM 49-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SE |
591507 | AM 49-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SW |
591508 | AM 49-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SW |
591509 | AM 49-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SE |
591510 | AM 49-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SE |
591511 | AM 49-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | SW |
591512 | AM 49-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | SW |
591513 | AM 50-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SW |
591514 | AM 50-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SW |
591515 | AM 50-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SE |
591516 | AM 50-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | SE |
591517 | AM 50-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SW |
591518 | AM 50-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SW |
591519 | AM 50-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SE |
591520 | AM 50-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | SE |
591521 | AM 50-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | SW |
591522 | AM 50-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | SW |
591523 | AM 51-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NW |
591524 | AM 51-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NW |
591525 | AM 51-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NE |
591526 | AM 51-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NE |
591527 | AM 51-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NW |
591528 | AM 51-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NW |
591529 | AM 51-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NE |
591530 | AM 51-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NE |
591531 | AM 51-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | NW |
591532 | AM 51-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | NW |
591533 | AM 52-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NW |
591534 | AM 52-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NW |
591535 | AM 52-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NE |
591536 | AM 52-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 31 | NE |
591537 | AM 52-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NW |
591538 | AM 52-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NW |
591539 | AM 52-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NE |
591540 | AM 52-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 32 | NE |
591541 | AM 52-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | NW |
591542 | AM 52-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 33 | NW |
591543 | AM 53-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SW |
591544 | AM 53-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SW |
591545 | AM 53-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SE |
591546 | AM 53-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SE |
591547 | AM 54-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SW |
591548 | AM 54-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SW |
591549 | AM 54-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SE |
591550 | AM 54-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | SE |
591551 | AM 55-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NW |
591552 | AM 55-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NW |
591553 | AM 55-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NE |
591554 | AM 55-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NE |
591555 | AM 56-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NW |
591556 | AM 56-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NW |
591557 | AM 56-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NE |
591558 | AM 56-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 21N | 12E | 30 | NE |
591575 | AM 37-226 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SW |
591576 | AM 37-227 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SE |
591577 | AM 37-228 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SE |
591578 | AM 37-229 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | SW |
591579 | AM 37-230 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | SW |
591590 | AM 38-226 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SW |
591591 | AM 38-227 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SE |
591592 | AM 38-228 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SE |
591593 | AM 38-229 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | SW |
591594 | AM 38-230 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | SW |
591605 | AM 39-226 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NW |
591606 | AM 39-227 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NE |
591607 | AM 39-228 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NE |
591608 | AM 39-229 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | NW |
591609 | AM 39-230 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | NW |
591620 | AM 40-226 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NW |
591621 | AM 40-227 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NE |
591622 | AM 40-228 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NE |
591623 | AM 40-229 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | NW |
591624 | AM 40-230 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 15 | NW |
591635 | AM 41-225 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SW |
591636 | AM 41-226 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SW |
591637 | AM 41-227 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SE |
591638 | AM 41-228 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SE |
591639 | AM 41-229 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | SW |
591640 | AM 41-230 | Granted | September 7, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | SW |
591648 | AM 42-223 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | SE |
591649 | AM 42-224 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | SE |
591650 | AM 42-225 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SW |
591651 | AM 42-226 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SW |
591652 | AM 42-227 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SE |
591653 | AM 42-228 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | SE |
591654 | AM 42-229 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | SW |
591655 | AM 42-230 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | SW |
591661 | AM 43-221 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NW |
591662 | AM 43-222 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NW |
591663 | AM 43-223 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NE |
591664 | AM 43-224 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NE |
591665 | AM 43-225 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NW |
591666 | AM 43-226 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NW |
591667 | AM 43-227 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NE |
591668 | AM 43-228 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NE |
591669 | AM 43-229 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | NW |
591670 | AM 43-230 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | NW |
591676 | AM 44-219 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 7 | NE |
591677 | AM 44-220 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 7 | NE |
591678 | AM 44-221 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NW |
591679 | AM 44-222 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NW |
591680 | AM 44-223 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NE |
591681 | AM 44-224 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | NE |
591682 | AM 44-225 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NW |
591683 | AM 44-226 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NW |
591684 | AM 44-227 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NE |
591685 | AM 44-228 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 9 | NE |
591686 | AM 44-229 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | NW |
591687 | AM 44-230 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 10 | NW |
591693 | AM 45-217 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SW |
591694 | AM 45-218 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SW |
591695 | AM 45-219 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SE |
591696 | AM 45-220 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SE |
591697 | AM 45-221 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SW |
591698 | AM 45-222 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SW |
591699 | AM 45-223 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SE |
591700 | AM 45-224 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SE |
591701 | AM 45-225 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SW |
591702 | AM 45-226 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SW |
591703 | AM 45-227 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SE |
591704 | AM 45-228 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SE |
591705 | AM 45-229 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | SW |
591706 | AM 45-230 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | SW |
591712 | AM 46-217 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SW |
591713 | AM 46-218 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SW |
591714 | AM 46-219 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SE |
591715 | AM 46-220 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | SE |
591716 | AM 46-221 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SW |
591717 | AM 46-222 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SW |
591718 | AM 46-223 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SE |
591719 | AM 46-224 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | SE |
591720 | AM 46-225 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SW |
591721 | AM 46-226 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SW |
591722 | AM 46-227 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SE |
591723 | AM 46-228 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | SE |
591724 | AM 46-229 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | SW |
591725 | AM 46-230 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | SW |
591731 | AM 47-217 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NW |
591732 | AM 47-218 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NW |
591733 | AM 47-219 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NE |
591734 | AM 47-220 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NE |
591735 | AM 47-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NW |
591736 | AM 47-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NW |
591737 | AM 47-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NE |
591738 | AM 47-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NE |
591739 | AM 47-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NW |
591740 | AM 47-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NW |
591741 | AM 47-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NE |
591742 | AM 47-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NE |
591743 | AM 47-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | NW |
591744 | AM 47-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | NW |
591745 | AM 48-217 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NW |
591746 | AM 48-218 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NW |
591747 | AM 48-219 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NE |
591748 | AM 48-220 | Granted | September 11, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 6 | NE |
591749 | AM 48-221 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NW |
591750 | AM 48-222 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NW |
591751 | AM 48-223 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NE |
591752 | AM 48-224 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 5 | NE |
591753 | AM 48-225 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NW |
591754 | AM 48-226 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NW |
591755 | AM 48-227 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NE |
591756 | AM 48-228 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 4 | NE |
591757 | AM 48-229 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | NW |
591758 | AM 48-230 | Granted | September 18, 1997 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 3 | NW |
634110 | EDC 1 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SW |
634111 | EDC 2 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SE |
634112 | EDC 3 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SE |
634113 | EDC 4 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SW |
634114 | EDC 5 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SW |
634115 | EDC 6 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SE |
634116 | EDC 7 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SE |
634117 | EDC 8 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SW |
634118 | EDC 9 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SW |
634119 | EDC 10 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SE |
634120 | EDC 11 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 12 | SE |
634121 | EDC 12 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SW |
634122 | EDC 13 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SW |
634123 | EDC 14 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SE |
634124 | EDC 15 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 7 | SE |
634125 | EDC 16 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 8 | SW |
634126 | EDC 17 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NW |
634127 | EDC 18 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NE |
634128 | EDC 19 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NE |
634129 | EDC 20 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NW |
634130 | EDC 21 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NW |
634131 | EDC 22 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NE |
634132 | EDC 23 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NE |
634133 | EDC 24 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NW |
634134 | EDC 25 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NW |
634135 | EDC 26 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NE |
634136 | EDC 27 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | NE |
634137 | EDC 28 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NW |
634138 | EDC 29 | Granted | April 26, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NW |
634139 | EDC 30 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NE |
634140 | EDC 31 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | NE |
634141 | EDC 32 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | NW |
634142 | EDC 33 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SW |
634143 | EDC 34 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SE |
634144 | EDC 35 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SE |
634145 | EDC 36 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SW |
634146 | EDC 37 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SW |
634147 | EDC 38 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SE |
634148 | EDC 39 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SE |
634149 | EDC 40 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SW |
634150 | EDC 41 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SW |
634151 | EDC 42 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SE |
634152 | EDC 43 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 13 | SE |
634153 | EDC 44 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SW |
634154 | EDC 45 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SW |
634155 | EDC 46 | Granted TA | August 19, 2011 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SE |
634156 | EDC 47 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 18 | SE |
634157 | EDC 48 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 17 | SW |
634158 | EDC 49 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NW |
634159 | EDC 50 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NE |
634160 | EDC 51 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NE |
634161 | EDC 52 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NW |
634162 | EDC 53 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NW |
634163 | EDC 54 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NE |
634164 | EDC 55 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NE |
634165 | EDC 56 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NW |
634166 | EDC 57 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NW |
634167 | EDC 58 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NE |
634168 | EDC 59 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | NE |
634169 | EDC 60 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NW |
634170 | EDC 61 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NW |
634171 | EDC 62 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NE |
634172 | EDC 63 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | NE |
634173 | EDC 64 | Granted | April 27, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | NW |
634174 | EDC 65 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SE |
634175 | EDC 66 | Granted TA | July 18, 2006 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SE |
634176 | EDC 67 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SW |
634177 | EDC 68 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SW |
634178 | EDC 69 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SE |
634179 | EDC 70 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SE |
634180 | EDC 71 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SW |
634181 | EDC 72 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SW |
634182 | EDC 73 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SE |
634183 | EDC 74 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SE |
634184 | EDC 75 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SW |
634185 | EDC 76 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 24 | SE |
634186 | EDC 77 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SW |
634187 | EDC 78 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SW |
634188 | EDC 79 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SE |
634189 | EDC 80 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 19 | SE |
634190 | EDC 81 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SW |
634191 | EDC 82 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SW |
634192 | EDC 83 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SE |
634193 | EDC 84 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 20 | SE |
634194 | EDC 85 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 21 | SW |
634195 | EDC 86 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NE |
634196 | EDC 87 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NW |
634197 | EDC 88 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NW |
634198 | EDC 89 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NE |
634199 | EDC 90 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NE |
634200 | EDC 91 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NW |
634201 | EDC 92 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NW |
634202 | EDC 93 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NE |
634203 | EDC 94 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NE |
634204 | EDC 95 | Granted | April 28, 2000 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NW |
650291 | HOSS 01 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 18 | NW |
650292 | HOSS 02 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 18 | NE |
650293 | HOSS 03 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 17 | NW |
650294 | HOSS 04 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 17 | NE |
650295 | HOSS 05 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 16 | NW |
650296 | HOSS 06 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 16 | NE |
650297 | HOSS 07 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 15 | NW |
650298 | HOSS 08 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 18 | SW |
650299 | HOSS 09 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 18 | SE |
650300 | HOSS 10 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 17 | SW |
650301 | HOSS 11 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 17 | SE |
650302 | HOSS 12 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 16 | SW |
650303 | HOSS 13 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 16 | SE |
650304 | HOSS 14 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 15 | SW |
650305 | HOSS 15 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 19 | NW |
650306 | HOSS 16 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 19 | NE |
650307 | HOSS 17 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 20 | NW |
650308 | HOSS 18 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 20 | NE |
650309 | HOSS 19 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 21 | NW |
650310 | HOSS 20 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 21 | NE |
650311 | HOSS 21 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 22 | NW |
650312 | HOSS 22 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 19 | SW |
650313 | HOSS 23 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 19 | SE |
650314 | HOSS 24 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 20 | SW |
650315 | HOSS 25 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 20 | SE |
650316 | HOSS 26 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 21 | SW |
650317 | HOSS 27 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 21 | SE |
650318 | HOSS 28 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 22 | SW |
650319 | HOSS 29 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 30 | NW |
650320 | HOSS 30 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 30 | NE |
650321 | HOSS 31 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 29 | NW |
650322 | HOSS 32 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 29 | NE |
650323 | HOSS 33 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 28 | NW |
650324 | HOSS 34 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 28 | NE |
650325 | HOSS 35 | Granted | July 13, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 27 | NW |
651299 | GAP 1 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 28 | NW |
651300 | GAP 2 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 28 | NE |
651301 | GAP 3 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 27 | NW |
651302 | GAP 4 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 27 | NE |
651303 | GAP 5 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 26 | NW |
651304 | GAP 6 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 26 | NE |
651305 | GAP 7 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 25 | NW |
651306 | GAP 8 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 25 | NE |
651307 | GAP 9 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 30 | NW |
651308 | GAP 10 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 30 | NE |
651309 | GAP 11 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 29 | NW |
651310 | GAP 12 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 28 | SW |
651311 | GAP 13 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 28 | SE |
651312 | GAP 14 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 27 | SW |
651313 | GAP 15 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 27 | SE |
651314 | GAP 16 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 26 | SW |
651315 | GAP 17 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 26 | SE |
651316 | GAP 18 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 25 | SW |
651317 | GAP 19 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 25 | SE |
651318 | GAP 20 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 30 | SW |
651319 | GAP 21 | Granted | September 27, 2005 | November 30,��2013 | 160 | Kotzebue | 22N | 9E | 30 | SE |
651320 | GAP 22 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 29 | SW |
651321 | GAP 23 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 29 | SE |
651322 | GAP 24 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 28 | SW |
651323 | GAP 25 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 28 | SE |
651324 | GAP 26 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 27 | SW |
651325 | GAP 27 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 34 | NE |
651326 | GAP 28 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 35 | NW |
651327 | GAP 29 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 35 | NE |
651328 | GAP 30 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 36 | NW |
651329 | GAP 31 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 36 | NE |
651330 | GAP 32 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 31 | NW |
651331 | GAP 33 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 31 | NE |
651332 | GAP 34 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 32 | NW |
651333 | GAP 35 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 32 | NE |
651334 | GAP 36 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 33 | NW |
651335 | GAP 37 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 33 | NE |
651336 | GAP 38 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 34 | NW |
651337 | GAP 39 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 34 | NE |
651338 | GAP 40 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 35 | NW |
651339 | GAP 41 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 35 | NE |
651340 | GAP 42 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 36 | NW |
651341 | GAP 43 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 36 | NE |
651342 | GAP 44 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 31 | NW |
651343 | GAP 45 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 31 | NE |
651344 | GAP 46 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 32 | NW |
651345 | GAP 47 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 32 | NE |
651346 | GAP 48 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 33 | NW |
651347 | GAP 49 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 33 | NE |
651348 | GAP 50 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 34 | NW |
651349 | GAP 51 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 30 | SW |
651350 | GAP 52 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 30 | SE |
651351 | GAP 53 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 29 | SW |
651352 | GAP 54 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 29 | SE |
651353 | GAP 55 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 28 | SW |
651354 | GAP 56 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 28 | SE |
651355 | GAP 57 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 27 | SW |
651356 | GAP 58 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 34 | SE |
651357 | GAP 59 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 35 | SW |
651358 | GAP 60 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 35 | SE |
651359 | GAP 61 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 36 | SW |
651360 | GAP 62 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 36 | SE |
651361 | GAP 63 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 31 | SW |
651362 | GAP 64 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 31 | SE |
651363 | GAP 65 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 32 | SW |
651364 | GAP 66 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 32 | SE |
651365 | GAP 67 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 33 | SW |
651366 | GAP 68 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 33 | SE |
651367 | GAP 69 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 34 | SW |
651368 | GAP 70 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 34 | SE |
651369 | GAP 71 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 35 | SW |
651370 | GAP 72 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 35 | SE |
651371 | GAP 73 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 36 | SW |
651372 | GAP 74 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 36 | SE |
651373 | GAP 75 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 31 | SW |
651374 | GAP 76 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 31 | SE |
651375 | GAP 77 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 32 | SW |
651376 | GAP 78 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 32 | SE |
651377 | GAP 79 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 33 | SW |
651378 | GAP 80 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 33 | SE |
651379 | GAP 81 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 34 | SW |
651380 | GAP 82 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 3 | NE |
651381 | GAP 83 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 2 | NW |
651382 | GAP 84 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 2 | NE |
651383 | GAP 85 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 1 | NW |
651384 | GAP 86 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 1 | NE |
651385 | GAP 87 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 6 | NW |
651386 | GAP 88 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 6 | NE |
651387 | GAP 89 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 2 | NW |
651388 | GAP 90 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 2 | NE |
651389 | GAP 91 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 1 | NW |
651390 | GAP 92 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 1 | NE |
651391 | GAP 93 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 6 | NW |
651392 | GAP 94 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 6 | NE |
651393 | GAP 95 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 5 | NW |
651394 | GAP 96 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 5 | NE |
651395 | GAP 97 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 4 | NW |
651396 | GAP 98 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 4 | NE |
651397 | GAP 99 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 3 | NW |
651398 | GAP 100 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 2 | SW |
651399 | GAP 101 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 2 | SE |
651400 | GAP 102 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 1 | SW |
651401 | GAP 103 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 1 | SE |
651402 | GAP 104 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 6 | SW |
651403 | GAP 105 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 6 | SE |
651404 | GAP 106 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 5 | SW |
651405 | GAP 107 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 5 | SE |
651406 | GAP 108 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 4 | SW |
651407 | GAP 109 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 4 | SE |
651408 | GAP 110 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 3 | SW |
651409 | GAP 111 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 3 | SE |
651410 | GAP 112 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 2 | SW |
651411 | GAP 113 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 2 | SE |
651412 | GAP 114 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NW |
651413 | GAP 115 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NW |
651414 | GAP 116 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NE |
651415 | GAP 117 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 11 | NE |
651416 | GAP 118 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NW |
651417 | GAP 119 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NW |
651418 | GAP 120 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NE |
651419 | GAP 121 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 9E | 12 | NE |
651420 | GAP 122 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NW |
651421 | GAP 123 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NW |
651422 | GAP 124 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NE |
651423 | GAP 125 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 7 | NE |
651424 | GAP 126 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NW |
651425 | GAP 127 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NW |
651426 | GAP 128 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NE |
651427 | GAP 129 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 8 | NE |
651428 | GAP 130 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NW |
651429 | GAP 131 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NW |
651430 | GAP 132 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NE |
651431 | GAP 133 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 9 | NE |
651432 | GAP 134 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NW |
651433 | GAP 135 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NW |
651434 | GAP 136 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NE |
651435 | GAP 137 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 10 | NE |
651436 | GAP 138 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NW |
651437 | GAP 139 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NW |
651438 | GAP 140 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NE |
651439 | GAP 141 | Granted | September 27, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 11 | NE |
651440 | GAP 142 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 5 | NW |
651441 | GAP 143 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 5 | NE |
651442 | GAP 144 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 4 | NW |
651443 | GAP 145 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 4 | NE |
651444 | GAP 146 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 3 | NW |
651445 | GAP 147 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 3 | NE |
651446 | GAP 148 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 3 | SE |
651447 | GAP 149 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 2 | SW |
651448 | GAP 150 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 2 | SE |
651449 | GAP 151 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 1 | SW |
651450 | GAP 152 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 1 | SE |
651451 | GAP 153 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 6 | SW |
651452 | GAP 154 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 6 | SE |
651453 | GAP 155 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 5 | SW |
651454 | GAP 156 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 5 | SE |
651455 | GAP 157 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 4 | SW |
651456 | GAP 158 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 4 | SE |
651457 | GAP 159 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 3 | SW |
651458 | GAP 160 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 3 | SE |
651459 | GAP 161 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 10 | NE |
651460 | GAP 162 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 11 | NW |
651461 | GAP 163 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 11 | NE |
651462 | GAP 164 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 12 | NW |
651463 | GAP 165 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 12 | NE |
651464 | GAP 166 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 7 | NW |
651465 | GAP 167 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 7 | NE |
651466 | GAP 168 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 8 | NW |
651467 | GAP 169 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 8 | NE |
651468 | GAP 170 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 9 | NW |
651469 | GAP 171 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 9 | NE |
651470 | GAP 172 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 10 | NW |
651471 | GAP 173 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 10 | NE |
651472 | GAP 174 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 10 | SE |
651473 | GAP 175 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 11 | SW |
651474 | GAP 176 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 11 | SE |
651475 | GAP 177 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 12 | SW |
651476 | GAP 178 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 12 | SE |
651477 | GAP 179 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 7 | SW |
651478 | GAP 180 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 7 | SE |
651479 | GAP 181 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 8 | SW |
651480 | GAP 182 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 8 | SE |
651481 | GAP 183 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 9 | SW |
651482 | GAP 184 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 9 | SE |
651483 | GAP 185 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 10 | SW |
651484 | GAP 186 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 10 | SE |
651485 | GAP 187 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 15 | NE |
651486 | GAP 188 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 14 | NW |
651487 | GAP 189 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 14 | NE |
651488 | GAP 190 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 13 | NW |
651489 | GAP 191 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 8E | 13 | NE |
651490 | GAP 192 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 18 | NW |
651491 | GAP 193 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 18 | NE |
651492 | GAP 194 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 17 | NW |
651493 | GAP 195 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 17 | NE |
651494 | GAP 196 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 16 | NW |
651495 | GAP 197 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 16 | NE |
651496 | GAP 198 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 15 | NW |
651497 | GAP 199 | Granted | September 27, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 9E | 15 | NE |
651270 | PAL 1 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NE |
651271 | PAL 2 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 10E | 25 | NE |
651272 | PAL 3 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NW |
651273 | PAL 4 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NW |
651274 | PAL 5 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NE |
651275 | PAL 6 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 30 | NE |
651276 | PAL 7 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NW |
651277 | PAL 8 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NW |
651278 | PAL 9 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NE |
651279 | PAL 10 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 29 | NE |
651280 | PAL 11 | Granted | September 26, 2005 | November 30, 2013 | 40 | Kotzebue | 21N | 11E | 28 | NW |
651289 | PAL 20 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 10E | 25 | SE |
651290 | PAL 21 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 30 | SW |
651291 | PAL 22 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 30 | SE |
651292 | PAL 23 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 29 | SW |
651293 | PAL 24 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 29 | SE |
651294 | PAL 25 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 28 | SW |
651296 | PAL 27 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 32 | NE |
651297 | PAL 28 | Granted | September 26, 2005 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 33 | NW |
651152 | ZED 1 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 10 | NE |
651153 | ZED 2 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 11 | NW |
651154 | ZED 3 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 11 | NE |
651155 | ZED 4 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 10 | SE |
651156 | ZED 5 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 11 | SW |
651157 | ZED 6 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 11 | SE |
651158 | ZED 7 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 12 | SW |
651159 | ZED 8 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 12 | SE |
651160 | ZED 9 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 15 | NE |
651161 | ZED 10 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 14 | NW |
651162 | ZED 11 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 14 | NE |
651163 | ZED 12 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 13 | NW |
651164 | ZED 13 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 13 | NE |
651165 | ZED 14 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 18 | NW |
651166 | ZED 15 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 18 | NE |
651167 | ZED 16 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 17 | NW |
651168 | ZED 17 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 17 | NE |
651169 | ZED 18 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 16 | NW |
651170 | ZED 19 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 16 | NE |
651171 | ZED 20 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 15 | NW |
651172 | ZED 21 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 15 | NE |
651173 | ZED 22 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 15 | SE |
651174 | ZED 23 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 14 | SW |
651175 | ZED 24 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 14 | SE |
651176 | ZED 25 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 13 | SW |
651177 | ZED 26 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 13 | SE |
651178 | ZED 27 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 18 | SW |
651179 | ZED 28 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 18 | SE |
651180 | ZED 29 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 17 | SW |
651181 | ZED 30 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 17 | SE |
651182 | ZED 31 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 16 | SW |
651183 | ZED 32 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 16 | SE |
651184 | ZED 33 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 15 | SW |
651185 | ZED 34 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 15 | SE |
651186 | ZED 35 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 24 | NE |
651187 | ZED 36 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 19 | NW |
651188 | ZED 37 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 19 | NE |
651189 | ZED 38 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 20 | NW |
651190 | ZED 39 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 20 | NE |
651191 | ZED 40 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 21 | NW |
651192 | ZED 41 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 21 | NE |
651193 | ZED 42 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 22 | NW |
651194 | ZED 43 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 22 | NE |
651195 | ZED 44 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 19 | SE |
651196 | ZED 45 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 20 | SW |
651197 | ZED 46 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 20 | SE |
651198 | ZED 47 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 21 | SW |
651199 | ZED 48 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 21 | SE |
651200 | ZED 49 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 22 | SW |
651201 | ZED 50 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 22 | SE |
651202 | ZED 51 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 23 | NW |
651203 | ZED 52 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 23 | NE |
651204 | ZED 53 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 24 | NW |
651205 | ZED 54 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 24 | NE |
651206 | ZED 55 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 19 | NW |
651207 | ZED 56 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 19 | NE |
651208 | ZED 57 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 20 | NW |
651209 | ZED 58 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 20 | NE |
651210 | ZED 59 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 21 | NW |
651211 | ZED 60 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 21 | NE |
651212 | ZED 61 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 22 | NW |
651213 | ZED 62 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 22 | NE |
651214 | ZED 63 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 23 | NW |
651215 | ZED 64 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 23 | NE |
651216 | ZED 65 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 24 | NW |
651217 | ZED 66 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 24 | NE |
651218 | ZED 67 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 15E | 19 | NW |
651219 | ZED 68 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 23 | SW |
651220 | ZED 69 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 23 | SE |
651221 | ZED 70 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 24 | SW |
651222 | ZED 71 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 24 | SE |
651223 | ZED 72 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 19 | SW |
651224 | ZED 73 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 19 | SE |
651225 | ZED 74 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 20 | SW |
651226 | ZED 75 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 20 | SE |
651227 | ZED 76 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 21 | SW |
651228 | ZED 77 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 21 | SE |
651229 | ZED 78 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 22 | SW |
651230 | ZED 79 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 22 | SE |
651231 | ZED 80 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 23 | SW |
651232 | ZED 81 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 23 | SE |
651233 | ZED 82 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 24 | SW |
651234 | ZED 83 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 24 | SE |
651235 | ZED 84 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 15E | 19 | SW |
651236 | ZED 85 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 26 | NW |
651237 | ZED 86 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 26 | NE |
651238 | ZED 87 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 25 | NW |
651239 | ZED 88 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 25 | NE |
651240 | ZED 89 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 30 | NW |
651241 | ZED 90 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 30 | NE |
651242 | ZED 91 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 29 | NW |
651243 | ZED 92 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 29 | NE |
651244 | ZED 93 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 28 | NW |
651245 | ZED 94 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 28 | NE |
651246 | ZED 95 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 27 | NW |
651247 | ZED 96 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 27 | NE |
651248 | ZED 97 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 26 | NW |
651249 | ZED 98 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 26 | NE |
651250 | ZED 99 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 25 | NW |
651251 | ZED 100 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 25 | NE |
651252 | ZED 101 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 15E | 30 | NW |
651253 | ZED 102 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 26 | SW |
651254 | ZED 103 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 26 | SE |
651255 | ZED 104 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 25 | SW |
651256 | ZED 105 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 25 | SE |
651257 | ZED 106 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 30 | SW |
651258 | ZED 107 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 30 | SE |
651259 | ZED 108 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 29 | SW |
651260 | ZED 109 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 29 | SE |
651261 | ZED 110 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 28 | SW |
651262 | ZED 111 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 28 | SE |
651263 | ZED 112 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 27 | SW |
651264 | ZED 113 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 27 | SE |
651265 | ZED 114 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 26 | SW |
651266 | ZED 115 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 26 | SE |
651267 | ZED 116 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 25 | SW |
651268 | ZED 117 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 14E | 25 | SE |
651269 | ZED 118 | Granted | September 28, 2005 | November 30, 2013 | 160 | Kotzebue | 20N | 15E | 30 | SW |
655537 | ZED 119 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 12 | NW |
655538 | ZED 120 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 12 | NE |
655539 | ZED 121 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 7 | NW |
655540 | ZED 122 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 7 | SW |
655541 | ZED 123 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 7 | SE |
655542 | ZED 124 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 8 | SW |
655543 | ZED 125 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 20N | 13E | 8 | SE |
655648 | KG 1 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 11 | SW |
655649 | KG 2 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 11 | SE |
655650 | KG 3 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 14 | NW |
655651 | KG 4 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 14 | NE |
655652 | KG 5 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 13 | NW |
655653 | KG 6 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 13 | NE |
655654 | KG 7 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 13 | SE |
655655 | KG 8 | Granted | September 8, 2006 | November 30, 2013 | 160 | Kotzebue | 21N | 11E | 24 | NE |
714584 | East DH 1 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 15 | SE |
714585 | East DH 2 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 22 | NE |
714586 | East DH 3 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 23 | NW |
714587 | East DH 4 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 22 | SE |
714588 | East DH 5 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 23 | SW |
714589 | COBRE 1 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 2 | NW |
714590 | COBRE 2 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 2 | NE |
714591 | COBRE 3 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 1 | NW |
714592 | COBRE 4 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 1 | NE |
714593 | COBRE 5 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 6 | NW |
714594 | COBRE 6 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 6 | NE |
714595 | COBRE 7 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 5 | NW |
714596 | COBRE 8 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 5 | NE |
714597 | COBRE 9 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 2 | SW |
714598 | COBRE 10 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 2 | SE |
714599 | COBRE 11 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 1 | SW |
714600 | COBRE 12 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 1 | SE |
714601 | COBRE 13 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 6 | SW |
714602 | COBRE 14 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 6 | SE |
714603 | COBRE 15 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 5 | SW |
714604 | COBRE 16 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 5 | SE |
714605 | COBRE 17 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 11 | NW |
714606 | COBRE 18 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 11 | NE |
714607 | COBRE 19 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 12 | NW |
714608 | COBRE 20 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 7E | 12 | NE |
714609 | COBRE 21 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 7 | NW |
714610 | COBRE 22 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 7 | NE |
714611 | COBRE 23 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 8 | NW |
714612 | COBRE 24 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 8 | NE |
714613 | COBRE 25 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 9 | NW |
714614 | COBRE 26 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 9 | NE |
714615 | COBRE 27 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 7 | SE |
714616 | COBRE 28 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 8 | SW |
714617 | COBRE 29 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 8 | SE |
714618 | COBRE 30 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 9 | SW |
714619 | COBRE 31 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 9 | SE |
714620 | COBRE 32 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 17 | NW |
714621 | COBRE 33 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 17 | NE |
714622 | COBRE 34 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 16 | NW |
714623 | COBRE 35 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 16 | NE |
714624 | COBRE 36 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 15 | NW |
714625 | COBRE 37 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 15 | NE |
714626 | COBRE 38 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 17 | SE |
714627 | COBRE 39 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 16 | SW |
714628 | COBRE 40 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 16 | SE |
714629 | COBRE 41 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 15 | SW |
714630 | COBRE 42 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 15 | SE |
714631 | COBRE 43 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 21 | NW |
714632 | COBRE 44 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 21 | NE |
714633 | COBRE 45 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 22 | NW |
714634 | COBRE 46 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 22 | NE |
714635 | COBRE 47 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 23 | NW |
714636 | COBRE 48 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 23 | NE |
714637 | COBRE 49 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 21 | SW |
714638 | COBRE 50 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 21 | SE |
714639 | COBRE 51 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 22 | SW |
714640 | COBRE 52 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 22 | SE |
714641 | COBRE 53 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 23 | SW |
714642 | COBRE 54 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 8E | 23 | SE |
714643 | West Horse 1 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 12 | SW |
714644 | West Horse 2 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 12 | SE |
714645 | West Horse 3 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 7 | SW |
714646 | West Horse 4 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 7 | SE |
714647 | West Horse 5 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 10E | 8 | SW |
714648 | West Horse 6 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 13 | NW |
714649 | West Horse 7 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 13 | NE |
714650 | West Horse 8 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 13 | SW |
714651 | West Horse 9 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 13 | SE |
714652 | West Horse 10 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 24 | NW |
714653 | West Horse 11 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 24 | NE |
714654 | West Horse 12 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 24 | SW |
714655 | West Horse 13 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 24 | SE |
714656 | West Horse 14 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 27 | NE |
714657 | West Horse 15 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 26 | NW |
714658 | West Horse 16 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 26 | NE |
714659 | West Horse 17 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 25 | NW |
714660 | West Horse 18 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 25 | NE |
714661 | West Horse 19 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 27 | SE |
714662 | West Horse 20 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 26 | SW |
714663 | West Horse 21 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 26 | SE |
714664 | West Horse 22 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 25 | SW |
714665 | West Horse 23 | Granted | June 21, 2012 | November 30, 2013 | 160 | Kotzebue | 22N | 9E | 25 | SE |
714748 | AM 37-225 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SW |
714749 | AM 38-225 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | SW |
714750 | AM 39-225 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NW |
714751 | AM 40-225 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 16 | NW |
714752 | AM 41-223 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | SE |
714753 | AM 41-224 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 8 | SE |
714754 | AM 43-219 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 7 | NE |
714755 | AM 43-220 | Granted | July 10, 2012 | November 30, 2013 | 40 | Kotzebue | 20N | 12E | 7 | NE |
714756 | AM 38-217 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 18 | SW |
714757 | AM 38-219 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 18 | SE |
714758 | AM 38-221 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 17 | SW |
714759 | AM 38-223 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 17 | SE |
714760 | AM 42-219 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 7 | SE |
714761 | AM 42-221 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 8 | SW |
714762 | AM 44-217 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 7 | NW |
714763 | AM 40-217 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 18 | NW |
714764 | AM 40-219 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 18 | NE |
714765 | AM 40-221 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 17 | NW |
714766 | AM 40-223 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 17 | NE |
714767 | AM 42-217 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 20N | 12E | 7 | SW |
714768 | KG 9 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 21N | 12E | 19 | NW |
714769 | KG 10 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 21N | 12E | 19 | NE |
714770 | KG 11 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 21N | 12E | 19 | SW |
714771 | KG 12 | Granted | July 10, 2012 | November 30, 2013 | 160 | Kotzebue | 21N | 12E | 19 | SE |
715147 | Cobre 55 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 14 | SW |
715148 | Cobre 56 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 14 | SE |
715149 | Cobre 57 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 13 | SW |
715150 | Cobre 58 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 23 | NW |
715151 | Cobre 59 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 23 | NE |
715152 | Cobre 60 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 24 | NW |
715153 | Cobre 61 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 24 | NE |
715154 | Cobre 62 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 19 | NW |
715155 | Cobre 63 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 23 | SE |
715156 | Cobre 64 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 24 | SW |
715157 | Cobre 65 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 24 | SE |
715158 | Cobre 66 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 19 | SW |
715159 | Cobre 67 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 19 | SE |
715160 | Cobre 68 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 26 | NE |
715161 | Cobre 69 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 25 | NW |
715162 | Cobre 70 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 25 | NE |
715163 | Cobre 71 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 30 | NW |
715164 | Cobre 72 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 30 | NE |
715165 | Cobre 73 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 29 | NW |
715166 | Cobre 74 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 29 | NE |
715167 | Cobre 75 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 26 | SE |
715168 | Cobre 76 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 25 | SW |
715169 | Cobre 77 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 25 | SE |
715170 | Cobre 78 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 30 | SW |
715171 | Cobre 79 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 30 | SE |
715172 | Cobre 80 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 29 | SW |
715173 | Cobre 81 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 29 | SE |
715174 | Cobre 82 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 36 | NW |
715175 | Cobre 83 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 7E | 36 | NE |
715176 | Cobre 84 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 31 | NW |
715177 | Cobre 85 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 31 | NE |
715178 | Cobre 86 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 32 | NW |
715179 | Cobre 87 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 32 | NE |
715180 | Cobre 88 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 31 | SE |
715181 | Cobre 89 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 32 | SW |
715182 | Cobre 90 | Granted | September 9, 2012 | November 30, 2013 | 160 | Kotzebue | 23N | 8E | 32 | SE |
50-81-0127 | USMS2245-1 | Issued | July 27, 1981 | no expiry | 240.02 | Kotzebue | 21N | 11E | 34; 35 | |
50-83-0174 | USMS2245-2 | Issued | June 3, 1983 | no expiry | 31.91 | Kotzebue | 20N; 21N | 11E | 2; 35 | |
| | | | | 112058 | | | | | |
546162 | Arctic 3 | Relinquished | August 19, 2011 | | 17 | Kotzebue | 21N | 11E | 35 | SW & NW |
F-054378 | ARCTIC 5 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 35 | |
F-054379 | ARCTIC 6 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 35 | |
F-054381 | ARCTIC 8 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 35 | |
F-054382 | ARCTIC 12 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 34 | |
F-054383 | ARCTIC 14 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 34 | |
F-054384 | ARCTIC 16 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 34 | |
F-054385 | ARCTIC 18 | Relinquished | September 6, 1965 | | 20 | Kotzebue | 21N | 11E | 34 | |
F-054386 | ARCTIC 20 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054387 | ARCTIC 21 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054388 | ARCTIC 22 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054392 | ARCTIC 33 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 35 | |
F-054418 | ARCTIC 300 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054419 | ARCTIC 301 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054425 | ARCTIC 400 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |
F-054426 | ARCTIC 401 | Relinquished | September 6, 1965 | 20 | Kotzebue | 21N | 11E | 34 | |