Thompson Creek Metals (TCPTF) 10-Q 9 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 06, 2015
Document Entity Information
Entity Registrant Name	Thompson Creek Metals Co Inc.
Entity Central Index Key	1,415,020
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		221,549,166
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 217.1	$ 265.6
Accounts receivable	52	42
Related party receivables	0.7	4.1
Product inventory	44.7	96.6
Materials and supplies inventory	26	30.4
Prepaid expenses and other current assets	6	7.7
Income and mining taxes receivable	1.2	0.5
Restricted cash	0	1.6
Deferred income tax assets	0.2	0.1
Total current assets	347.9	448.6
Property, plant, equipment and development, net	1,923.1	2,218.3
Restricted cash	0	5.7
Reclamation deposits	10.1	10.3
Other assets	34.2	35.4
Deferred income tax assets	133.3	128
Total assets	2,448.6	2,846.3
Current liabilities
Accounts payable and accrued liabilities	73.9	93.1
Income, mining and other taxes payable	0.4	1.8
Current portion of Gold Stream deferred revenue	42.6	40.4
Current portion of long-term debt	0.7	3.9
Current portion of long-term lease obligations	25.5	22.8
Deferred income tax liabilities	12.9	14.1
Other current liabilities	2.5	0.3
Total current liabilities	158.5	176.4
Gold Stream deferred revenue	695	721.1
Long-term debt	831.5	872.3
Long-term lease obligations	33.8	45.7
Other liabilities (Note 10)	20.8	5.2
Asset retirement obligations	34.3	35.3
Deferred income tax liabilities	80.6	102.8
Total liabilities	$ 1,854.5	$ 1,958.8
Commitments and contingencies
Shareholders' equity
Common stock, no-par, 221,233,232 and 214,148,315 shares issued and outstanding as of September 30, 2015 and December 31, 2014, respectively	$ 1,195.9	$ 1,186.1
Additional paid-in capital	81.8	86.6
Accumulated deficit	(394.7)	(246.9)
Accumulated other comprehensive income (loss)	(288.9)	(138.3)
Total shareholders' equity	594.1	887.5
Total liabilities and shareholders' equity	$ 2,448.6	$ 2,846.3

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, shares issued	221,233,232	221,233,232
Common stock, shares outstanding	214,148,315	214,148,315

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS and COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES
Copper sales	$ 43.5	$ 45.7	$ 125	$ 140.3
Gold sales	69.5	55	161.8	133.5
Molybdenum sales	23	124.3	86.7	353.5
Tolling, calcining and other	5.7	4.3	25.3	11.4
Total revenues	141.7	229.3	398.8	638.7
Cost of sales
Operating expenses	88.5	133.4	246.8	395.2
Depreciation, depletion and amortization	30.9	22.7	77.7	78.3
Total cost of sales	119.4	156.1	324.5	473.5
Selling and marketing	3.1	3.1	8.3	10.8
Accretion expense	0.6	0.9	1.8	2.7
General and administrative	4.6	5.1	15.1	16.9
Exploration	0	0.3	0.1	0.6
Costs for idle mining operations	3.5	0	21.2	0
Total costs and expenses	131.2	165.5	371	504.5
OPERATING INCOME	10.5	63.8	27.8	134.2
OTHER EXPENSE (INCOME)
Loss on foreign exchange	68.8	60.3	140.1	64.5
Interest and finance fees	21.3	22.5	66.2	69.4
Loss from debt extinguishment	0	0	2.8	0.5
Interest income	0	0	(0.1)	(0.2)
Other	(1.7)	(3.1)	(4.8)	(6.1)
Total other expense	88.4	79.7	204.2	128.1
(Loss) income before income and mining taxes	(77.9)	(15.9)	(176.4)	6.1
Total income and mining tax benefit	(17)	(4.8)	(28.6)	(5.3)
NET (LOSS) INCOME	(60.9)	(11.1)	(147.8)	11.4
COMPREHENSIVE LOSS
Foreign currency translation	(71.2)	(58.2)	(150.6)	(61.8)
Total other comprehensive loss	(71.2)	(58.2)	(150.6)	(61.8)
Total comprehensive loss	$ (132.1)	$ (69.3)	$ (298.4)	$ (50.4)
NET (LOSS) INCOME PER SHARE
Basic (in USD per share)	$ (0.28)	$ (0.05)	$ (0.68)	$ 0.06
Diluted (in USD per share)	$ (0.28)	$ (0.05)	$ (0.68)	$ 0.05
Weighted-average number of common shares
Basic (in shares)	221.2	213.9	217.9	186.8
Diluted (in shares)	221.2	213.9	217.9	220.1

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Cash Flows [Abstract]
Net (loss) income	$ (60.9)	$ (11.1)	$ (147.8)	$ 11.4
OPERATING ACTIVITIES
Depreciation, depletion and amortization	30.9	22.7	77.7	78.3
Deferred revenue related to Gold Stream Arrangement	(13.1)	(10.8)	(29.5)	(24.9)
Accretion expense	0.6	0.9	1.8	2.7
Amortization of finance fees	1.2	1.2	3.6	3.8
Stock-based compensation	1.7	1.9	4.8	4.5
Obsolete materials and supplies inventory write downs	0	0.1	0	0.3
Product inventory write downs	4.7	2.3	11.7	8.9
Deferred income tax benefit	(16.5)	(11.3)	(26.6)	(20.6)
Unrealized loss (gain) on financial instruments and mark-to-market adjustments	2	(1.6)	2	(4.8)
Unrealized foreign exchange loss	67.5	60.3	138.1	63.9
Debt extinguishment	0	0	0.4	(0.1)
Changes in other long term liabilities	15.9	0	15.9	0
Changes in other long term assets	0	0	(2.5)	0
Gold Stream Arrangement net payable	8	14	8.3	24.9
Change in current assets and liabilities (Note 17)	(3.5)	14.4	(0.8)	1.6
Cash generated by operating activities	38.5	83	57.1	149.9
INVESTING ACTIVITIES
Capital expenditures	(24.9)	(21.9)	(47.8)	(70.4)
Capitalized interest payments	(0.2)	(1.3)	(1.2)	(8.2)
Restricted cash	0	0.4	7.2	0.4
Reclamation refund	0.2	0	0.2	0
Reclamation deposit	0	0	0	(10)
Cash used in investing activities	(24.9)	(22.8)	(41.6)	(88.2)
FINANCING ACTIVITIES
Equipment financings and repayments	(6.4)	(5.4)	(19)	(16.2)
Repayment of long-term debt	(0.5)	(1.2)	(2.8)	(10)
Senior note repurchases	0	0	(41)	0
Proceeds from issuance of common shares, net	0.1	0	0.6	0
Cash used in financing activities	(6.8)	(6.6)	(62.2)	(26.2)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(0.8)	(3.1)	(1.8)	(2.8)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	6	50.5	(48.5)	32.7
Cash and cash equivalents, beginning of period	211.1	216.1	265.6	233.9
Cash and cash equivalents, end of period	$ 217.1	$ 266.6	$ 217.1	$ 266.6

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 9 months ended Sep. 30, 2015 - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balances at (in shares) at Dec. 31, 2014	214,148,315	214,148,000
Beginning balance at Dec. 31, 2014	$ 887.5	$ 1,186.1	$ 86.6	$ (246.9)	$ (138.3)
Increase (Decrease) in Shareholders' Equity
Amortization of stock-based compensation	4.8		4.8
Shares issued under stock-based compensation	0.2	$ 2.6	(2.4)
Shares issued under stock-based compensation (in shares)		980,000
Settlement of tangible equity units	0	$ 7.2	(7.2)
Settlement of tangible equity units (in shares)		6,105,000
Comprehensive loss:
Net (loss) income	(147.8)			(147.8)
Foreign currency translation	(150.6)				(150.6)
Total comprehensive loss	$ (298.4)
Balances at (in shares) at Sep. 30, 2015	214,148,315	221,233,000
Ending balance at Sep. 30, 2015	$ 594.1	$ 1,195.9	$ 81.8	$ (394.7)	$ (288.9)

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q. In compliance with those instructions, certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States ("US GAAP") have been condensed or omitted. This report should be read in conjunction with the Thompson Creek Metals Company Inc. ("TCM," "Company," "we," "us" or "our") consolidated financial statements and notes contained in its Annual Report on Form 10-K for the year ended December 31, 2014 (the "2014 Form 10-K") filed with the Securities and Exchange Commission ("SEC"). The information reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for the interim periods reported. Operating results for the three and nine months ended September 30, 2015 are not necessarily indicative of the results that may be expected for any other quarter or for the year ending December 31, 2015. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. TCM bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions. Certain prior year amounts in the financial statements have been reclassified to conform to the current year presentation. The condensed consolidated financial statements include the accounts of TCM and its subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Financial amounts are presented in United States ("US") dollars unless otherwise stated. References to C$ are Canadian dollars. As used herein, "Mount Milligan Mine" refers to TCM's conventional truck-shovel open-pit copper and gold mine and concentrator with a copper-gold flotation processing plant in British Columbia, Canada; "Langeloth Facility" refers to TCM's Langeloth Metallurgical Facility in Pennsylvania, USA; "TC Mine" refers to Thompson Creek Mine, TCM's open-pit molybdenum mine and concentrator in Idaho, USA, and "Endako Mine" refers to the open-pit molybdenum mine, concentrator and roaster in British Columbia, Canada in which TCM owns a 75% joint venture interest. Due to continued weakness in the molybdenum market Endako Mine was placed on temporary suspension in December 2014 and then was placed on care and maintenance effective July 1, 2015. As previously disclosed in TCM's 2014 Form 10-K, TC Mine was placed on care and maintenance in December 2014 after the processing of stockpiled ore from Phase 7 was completed. During the nine months ended September 30, 2015, TC Mine conducted limited stripping for the next phase of mining (referred to as “Phase 8”). As part of TCM's cost reduction measures, further stripping at TC Mine ceased effective August 6, 2015. The costs related to the Endako Mine six month temporary suspension and three-month care and maintenance and TC Mine nine-month care and maintenance are reflected in costs for idle mining operations in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Accounts Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Accounts Receivable	Accounts Receivable Accounts receivable are carried at their estimated collectible amounts and were comprised of the following: September 30, 2015 December 31, 2014 Receivables Trade receivables $ 53.8 $ 41.0 Mark-to-market adjustments on trade receivables relating to provisional invoices for Mount Milligan Mine copper and gold concentrate sales (4.9 ) (3.5 ) Goods and services sales tax refunds 1.1 2.0 Settlement receivables on hedges and other miscellaneous receivables 2.0 2.5 $ 52.0 $ 42.0 Related party receivables 0.7 4.1 $ 52.7 $ 46.1

Inventory

Inventory	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Inventory	Inventory The carrying value of product inventory was as follows: September 30, 2015 December 31, 2014 Copper and Gold Inventory Concentrate $ 7.1 $ 29.4 Stockpiled ore 14.0 8.3 $ 21.1 $ 37.7 Molybdenum Inventory Finished product $ 9.4 $ 45.0 Work-in-process 13.8 13.5 Stockpiled ore 0.4 0.4 $ 23.6 $ 58.9 $ 44.7 $ 96.6 As of September 30, 2015 and December 31, 2014, the carrying value of TCM's molybdenum inventory exceeded its market value, resulting in inventory write downs. The following table sets forth the write downs of TCM's molybdenum inventory in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss for the three and nine months ended September 30, 2015 : Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 US Molybdenum Operating expense $ 4.7 $ — $ 10.3 $ — Depreciation, depletion and amortization 0.1 — 0.5 — Canadian Molybdenum Operating expense — 2.3 1.4 8.9 Depreciation, depletion and amortization — 0.3 0.1 1.7 $ 4.8 $ 2.6 $ 12.3 $ 10.6

Property, Plant, Equipment and

Property, Plant, Equipment and Development, Net	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Plant, Equipment and Development, Net	Property, Plant, Equipment and Development, Net Property, plant, equipment and development, net, was comprised of the following: September 30, 2015 December 31, 2014 Mining properties and mineral reserves $ 641.6 $ 703.7 Mining and milling equipment and facilities (1) 1,323.2 1,523.4 Processing facilities 171.8 171.1 Construction-in-progress (2) 39.4 23.1 Other 9.9 6.5 2,185.9 2,427.8 Less: Accumulated depreciation, depletion and amortization (262.8 ) (209.5 ) $ 1,923.1 $ 2,218.3 (1) As of September 30, 2015 , mining and milling equipment and facilities included $13.0 million related to the July 2015 settlement of outstanding claims from two contractors that provided construction and installation services for the Mount Milligan project. (2) The construction-in-progress balances consisted primarily of projects at Mount Milligan Mine.

Financial Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	Financial Instruments TCM enters into various derivative financial instruments in the normal course of operations to manage exposure to the market prices of copper, gold and molybdenum. TCM does not apply hedge accounting to its derivative instruments. Accordingly, changes in fair value of derivative instruments are recorded in the Condensed Consolidated Statements of Operations and Comprehensive Loss, except those contracts for which TCM has elected to apply the normal purchases and normal sales scope exception. The following table sets forth the fair values of TCM's derivative assets and liabilities: Fair Value as of September 30, 2015 December 31, 2014 Assets (1) Commodity contracts $ 0.5 $ 1.8 Provisionally-priced sales 1.6 — Total $ 2.1 $ 1.8 Liabilities (1) Commodity contracts $ 0.4 $ — Provisionally-priced contracts $ 5.0 $ — Forward currency contracts $ 2.0 $ 0.3 Total 7.4 0.3 _____________________________________________________________________________ (1) TCM's derivative assets are included in prepaid expenses and other current assets, and derivative liabilities are included in other current liabilities on its condensed consolidated balance sheets. TCM is exposed to credit risk when counterparties with whom it has entered into derivative transactions are unable to satisfy their obligations. To reduce counterparty credit exposure, TCM deals primarily with large, credit-worthy financial institutions and companies. TCM believes the counterparties to the contracts to be credit-worthy entities and, therefore, TCM believes credit risk of counterparty non-performance is relatively low, and, as such, the fair value of the derivatives has not been adjusted. The following table sets forth the gains (losses) on derivative instruments for the periods presented: Three Months Ended Nine Months Ended Derivative Type and Activity Statement of Operations Classification September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Gold hedges related to Gold Stream Arrangement Gold sales $ (0.9 ) $ (0.7 ) $ (0.4 ) $ (0.4 ) Provisional priced MTM gold sales Gold sales $ (0.4 ) $ (2.8 ) $ (1.1 ) $ (1.9 ) Provisional priced MTM copper sales Copper sales $ (1.5 ) $ (4.1 ) $ (0.3 ) $ (1.9 ) Copper and Gold hedges; other commodity contracts Other $ 1.6 $ 2.9 $ 4.7 $ 2.8 Forward currency contracts Gain (loss) on foreign exchange, net $ (3.3 ) $ (0.5 ) $ (4.0 ) $ 0.2 Gold Hedges Related to Gold Stream Arrangement and Other Commodity Contracts TCM must satisfy its obligation under the Gold Stream Arrangement (discussed in Note 9) by delivering gold to Royal Gold after TCM receives cash payment from third-party purchasers, including offtakers and traders, that purchase concentrate from Mount Milligan Mine ("MTM Customers"). In order to hedge its gold price risk that arises when physical purchase and concentrate sales pricing periods do not match, hereafter referred to as the Gold Stream Risk, TCM has entered into certain forward gold purchase and sales contracts pursuant to which it purchases gold at an average price during a quotational period and sells gold at a spot price. TCM records its forward commodity contracts at fair value using a market approach based on observable quoted market prices and contracted prices. In addition to the Gold Stream Risk and in connection with the sale of concentrate from Mount Milligan Mine, TCM is exposed to copper and gold price fluctuations between the dates of concentrate shipment, provisional payment and final payment. In order to hedge the price risk for the metals contained in concentrate, TCM has entered into certain forward copper and gold purchase and sale contracts pursuant to which it purchases copper or gold at an average price during a quotational period and sells copper or gold at a spot price. Additionally, TCM has entered into zero cost collars pursuant to which it agrees with a counterparty to a floor and ceiling relative to future prices of gold and copper. If the gold or copper price is below the floor, the counterparty pays TCM the difference between the price and the floor. If the gold or copper price is above the ceiling, TCM pays the counterparty the difference between the ceiling and the price. TCM records its copper and gold commodity contracts at fair value using a market approach based on observable quoted market prices and contracted prices. These activities are intended to protect against the price risk related to the MTM Customer purchase contracts. Additionally TCM also enters into fuel hedges to manage its exposure to price fluctuations in the cost of diesel purchased for use in operations. The following table provides details of TCM's commodity contracts as of September 30, 2015 : Quantity Sell Price Buy Price Maturities Through Gold Hedge Purchases related to Gold Stream Arrangement (oz) 44,520 TBD $1,094 - $1,202 October 2015 - February 2016 Forward Gold Sales (oz) 17,000 $1,130 N/A October 2015 - June 2016 Forward Copper Sales (lb) 4,409,240 $2.40 - $2.45 N/A October 2015 - November 2015 Fuel Hedges (gallons) 1,965,000 N/A $1.90 - $2.00 October 2015 - December 2016 Quantity Put Price Call Price Maturities Through Gold Collars (oz) 22,500 $1,050 - $1,200 $1,151 - $1,360 October 2015 - August 2016 Copper Collars (lb) 6,613,860 $2.00 $2.99 October 2015 - December 2015 Provisionally-Priced Contracts TCM's copper and gold sales contracts provide for provisional pricing. These sales contain an embedded derivative related to the provisional-pricing mechanism, which is bifurcated and accounted for as a derivative. TCM also enters into provisionally-priced molybdenum purchase contracts that also contain an embedded derivative, which is bifurcated and accounted for as a derivative. TCM determines the fair value of its provisionally-priced contracts using a market approach based upon observable inputs from published market prices and contract terms. Changes to the fair values of the embedded derivatives related to provisionally-priced molybdenum purchases are included in operating expenses in the Condensed Consolidated Statements of Operations and Comprehensive Loss as the product is sold. The following table sets forth TCM's outstanding provisionally-priced contracts as of September 30, 2015 : Average Price Per Unit Open Positions Market Price Contract Maturities Through Embedded derivatives in provisional sales contracts Copper (millions of pounds) 29.9 TBD TBD January 2016 Gold (ounces) 44,729 TBD TBD November 2015 Embedded derivatives in provisional purchase contracts Molybdenum (millions of pounds) 1.6 N/A TBD November 2015 Forward Currency Contracts TCM transacts business in various currencies in the normal course of its operations and for capital expenditures. In addition, although TCM's revenues are denominated in US dollars, TCM has ongoing foreign exchange risk with respect to its Canadian operations. To help mitigate this risk, TCM has entered into foreign currency forward contracts pursuant to which it has agreed to buy Canadian dollars at an agreed-upon rate. TCM records its currency contracts at fair value using a market approach based on observable quoted exchange rates and contracted notional amounts. As of September 30, 2015 , TCM had 31 open foreign currency option contracts. The following table provides details of TCM's forward currency contracts as of September 30, 2015 : Notional Amount Buy Price Maturities Through Forward currency contracts C$80,000,000 $1USD/C$1.29 October 2015 - May 2016 Fixed-Priced Contracts TCM enters into certain sales contracts pursuant to which it sells molybdenum products at certain times in the future at fixed prices. These fixed prices may be different than the quoted market prices at the date of sale. TCM has elected to treat these contracts as normal sale contracts. The Gold Stream Arrangement contains an agreement to sell gold at a fixed price, but it does not meet the definition of a derivative instrument. See discussion of the Gold Stream Arrangement in Note 9. The following table sets forth TCM's outstanding molybdenum fixed-priced sales contracts as of September 30, 2015 : Quantity (000's lb) Sell Price Maturities Through Molybdenum fixed price sales 171.8 $10.55 December 2015

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement US GAAP includes a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 inputs) and the lowest priority to unobservable inputs (Level 3 inputs). TCM's policy is to recognize transfers into and out of Level 3 as of the actual date of the event or change in circumstances. There were no transfers into or out of Level 1, 2 or 3 during the three and nine months ended September 30, 2015 . The following table sets forth a reconciliation of activity related to Level 3 financial liabilities for the nine months ended September 30, 2015 : Debt Balance at January 1, 2015 $ 0.4 Settlement of tMEDS (0.4 ) Balance at September 30, 2015 $ — The following table sets forth TCM's financial assets and liabilities measured at fair value by level within the fair value hierarchy. As required, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement, as discussed in Note 2 to the 2014 Form 10-K. Fair Value at September 30, 2015 Total Level 1 Level 2 Level 3 Assets Commodity contracts $ 0.5 $ — $ 0.5 $ — Provisionally-priced sales 1.6 — 1.6 — $ 2.1 $ — $ 2.1 $ — Liabilities Senior secured notes $ 287.1 $ — $ 287.1 $ — Senior unsecured notes 254.1 — 254.1 — Commodity contracts 0.4 — 0.4 — Provisionally-priced contracts 5.0 — 5.0 — Forward currency contracts 2.0 2.0 — — $ 548.6 $ 2.0 $ 546.6 $ — Fair Value at December 31, 2014 Total Level 1 Level 2 Level 3 Assets Commodity contracts $ 1.8 $ — $ 1.8 $ — $ 1.8 $ — $ 1.8 $ — Liabilities Senior secured notes $ 393.2 $ — $ 393.2 $ — Senior unsecured notes 453.3 — 453.3 — tMEDS 0.4 — — 0.4 Forward currency contracts 0.3 0.3 — — $ 847.2 $ 0.3 $ 846.5 $ 0.4 For more information regarding the classification and valuation methods used for TCM's Level 2 and 3 financial liabilities, see Note 6 within Item 8 of TCM's 2014 Form 10-K. As of September 30, 2015 , the carrying values of TCM's senior secured and unsecured notes were higher than their fair values. TCM determined the fair value of the notes using a discounted cash flow valuation model, consisting of inputs such as risk-free interest rates and credit spreads. See Note 8 for more information regarding the debt. As of September 30, 2015 , the carrying values of TCM's financial instruments approximated their fair values. TCM determined the fair value of its financial instruments using LME or COMEX copper and gold forward prices and option pricing models using the counterparties' and TCM's credit quality. See Note 5 for more information regarding TCM's financial instruments. On May 15, 2015, the prepaid share purchase contract portion of each outstanding tangible equity units ("tMEDS") was automatically settled at the maximum settlement rate of 5.3879 shares of common stock. TCM issued a total of 6,105,210 shares of common stock in connection with such settlement. See Note 11 for more information regarding the tMEDS.

Leases

Leases	9 Months Ended
	Sep. 30, 2015
Leases, Capital [Abstract]
Leases	Leases TCM's total capital lease obligations consisted of the following: September 30, 2015 December 31, 2014 Equipment Facility capital leases $ 22.4 $ 20.3 Equipment Facility sale leaseback 35.0 45.9 Sale leaseback 1.9 2.3 Total lease obligations 59.3 68.5 Less: Current portion (25.5 ) (22.8 ) Total long-term lease obligations $ 33.8 $ 45.7 On March 30, 2011, TCM entered into an equipment financing facility, as amended from time to time (the "Equipment Facility"), pursuant to which Caterpillar Financial Services Limited ("Caterpillar") agreed to underwrite up to $132.0 million in mobile fleet equipment financing for Mount Milligan Mine. Each borrowing under the Equipment Facility represents a capital lease or a sale leaseback arrangement and has a term of 48 or 60 months . Interest on the amounts borrowed under the Equipment Facility is payable at either floating or fixed rates, at TCM's option. At the end of each 48 or 60 month lease period, TCM has the option to purchase the underlying equipment for a nominal sum. The Equipment Facility includes non-financial covenants, and as of September 30, 2015 , TCM was in compliance with these covenants. On January 15, 2015, TCM entered into an amendment with Caterpillar which extends TCM's ability to finance additional equipment under the Equipment Facility through December 2015. As of September 30, 2015, TCM had entered into two new capital leases with Caterpillar with respect to certain equipment pursuant to the Equipment Facility. The leases resulted in an increase of $8.3 million to TCM's capital lease obligation after total upfront payments of $0.9 million . Interest payments are based on an annual fixed rate of 5.70% . During 2013, TCM entered into a sale-leaseback transaction with Caterpillar with respect to certain Endako Mine equipment, which is separate from the Equipment Facility, described above. On September 4, 2015, TCM assumed the lease for the remaining 25% of the equipment and subsequently transferred this equipment to Mount Milligan Mine. In connection with this transfer, TCM paid $0.3 million to Sojitz, TCM's Endako Mine joint venture partner, for its 25% share of the fair value of the leased equipment and recognized an additional sale-leaseback obligation of $0.5 million . Interest and debt issuance costs on the equipment financings, as described above, consisted of the following: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 0.9 $ 1.1 $ 2.8 $ 3.6 Interest and debt issuance costs expensed $ 1.0 $ 1.2 $ 3.3 $ 3.9

Debt

Debt	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Debt	Debt TCM's secured and unsecured notes, tMEDS and equipment loans consisted of the following: September 30, 2015 December 31, 2014 9.75% Senior secured notes due 2017, net of discount $ 314.4 $ 347.9 7.375% Senior unsecured notes due 2018 334.1 335.8 12.5% Senior unsecured notes due 2019 183.0 188.5 tMEDS — 1.2 Equipment loans 0.7 2.8 Total debt 832.2 876.2 Less: Current portion (0.7 ) (3.9 ) Total long-term debt $ 831.5 $ 872.3 Interest paid, capitalized and expensed was as follows: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 15.4 $ 17.1 $ 57.6 $ 60.8 Interest capitalized $ 0.5 $ 1.4 $ 1.1 $ 3.3 Interest expensed $ 20.3 $ 21.3 $ 62.9 $ 65.5 9.75% Senior Secured Notes The 9.75% senior secured notes (the “2017 Notes”) are guaranteed on a senior basis by substantially all of TCM's subsidiaries and are secured by a first priority lien, subject to permitted liens, on substantially all of TCM's and the guarantors' property and assets. The 2017 Notes mature on December 1, 2017 and accrue interest from November 27, 2012 until maturity at a fixed rate of 9.75% per year. Interest on the 2017 Notes is payable on February 1 and August 1 of each year, commencing February 1, 2013, to the holders of record at the close of business on the January 15 and July 15 prior to each interest payment date. The 2017 Notes are presented net of a discount of $1.4 million and $2.1 million as of September 30, 2015 and December 31, 2014, respectively. There are no maintenance covenants with respect to TCM's financial performance. However, the indenture contains certain transaction-based restrictive covenants. For more information regarding the 2017 Notes, see Note 9 within Item 8 of TCM's 2014 Form 10-K. In the second quarter of 2015, TCM repurchased $34.2 million of the 2017 Notes in a privately negotiated transaction and recorded a debt extinguishment loss of $3.1 million and reduced $0.5 million of the related unamortized debt issuance costs. 7.375% Senior Unsecured Notes The 7.375% senior unsecured notes (the "2018 Notes") are guaranteed on a senior basis by substantially all of TCM's subsidiaries. The 2018 Notes mature on June 1, 2018 and accrue interest from May 20, 2011 until maturity at a fixed rate of 7.375% per year. Interest is payable on June 1 and December 1 of each year, and the first interest payment occurred on December 1, 2011. Interest is payable to the holders of record at the close of business on the May 15 and November 15 prior to each interest payment date. There are no maintenance covenants with respect to TCM's financial performance. However, the indenture contains certain transaction-based restrictive covenants. For more information regarding the 2018 Notes, see Note 9 within Item 8 of TCM's 2014 Form 10-K. In the first quarter of 2015 , TCM repurchased $1.8 million of the 2018 Notes in open market transactions and recorded a debt extinguishment gain of $0.3 million and reduced the related unamortized debt issuance costs by an insignificant amount. 12.5% Senior Unsecured Notes The 12.5% senior unsecured notes (the “2019 Notes”) are guaranteed on a senior basis by substantially all of TCM's subsidiaries. The 2019 Notes mature on May 1, 2019 and accrue interest from May 11, 2012 until maturity at a fixed rate of 12.5% per year. Interest on the 2019 Notes is payable on May 1 and November 1 of each year, commencing November 1, 2012, to the holders of record at the close of business on the April 15 and October 15 prior to each interest payment date. There are no maintenance covenants with respect to TCM's financial performance. However, the indenture contains certain transaction-based restrictive covenants. For more information regarding the 2019 Notes, see Note 9 within Item 8 of TCM's 2014 Form 10-K. In the first quarter of 2015 , TCM repurchased $5.5 million of the 2019 Notes in open market transactions and recorded an insignificant debt extinguishment loss and reduced $0.1 million of the related unamortized debt issuance costs. Mobile Mining Equipment Loans On December 8, 2010, TCM executed an equipment financing agreement with Caterpillar in the amount of $12.8 million secured by six units of mobile mining equipment purchased by TCM during 2010. This fixed-rate loan bears interest at 3.6% , is scheduled to mature no later than December 8, 2015 and has an outstanding payable amount of $0.7 million as of September 30, 2015 .

Gold Stream Arrangement

Gold Stream Arrangement	9 Months Ended
	Sep. 30, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Gold Stream Arrangement	Gold Stream Arrangement Pursuant to TCM's agreement with a subsidiary of Royal Gold, Inc. ("Royal Gold") (referred to as the "Gold Stream Arrangement"), TCM agreed to sell to Royal Gold 52.25% of the refined gold production from Mount Milligan Mine for a total upfront payment of $781.5 million , plus $435 per ounce, or the prevailing market rate if lower than $435 per ounce, when the gold is delivered. The upfront cash payments received under the Gold Stream Arrangement (referred to herein as the "Record of Deposit") were recorded as deferred revenue and classified as a liability on TCM's Condensed Consolidated Balance Sheets. As of September 30, 2015 , the outstanding Record of Deposit under the Gold Stream Arrangement totaled $680.2 million . In the event of any default under the Company's agreement with Royal Gold, Royal Gold could require TCM to repay the outstanding Record of Deposit. For more information regarding the Gold Stream Arrangement, see Note 10 within Item 8 of TCM's 2014 Form 10-K. The following table presents the revenue under the Gold Stream Arrangement for the three and nine months ended September 30, 2015 and 2014, respectively, in the form of (i) cash receipts based on gold sales during the applicable period, and (ii) deferred revenue for gold ounces delivered and deferred revenue to be recognized upon final settlement during the applicable period: Three Months Ended Nine Months Ended (US$ in millions) September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Gold sales related to cash portion of Gold Stream Arrangement $ 17.0 $ 13.0 $ 38.4 $ 30.2 Gold sales related to deferred portion of Gold Stream Arrangement (1) 13.1 10.8 29.5 24.9 Total gold sales under Gold Stream Arrangement (1) $ 30.1 $ 23.8 $ 67.9 $ 55.1 _____________________________________________________________________________ (1) The three months ended September 30, 2015 and 2014 included $8.0 million and $4.9 million , respectively, of revenue for gold ounces delivered, and $5.1 million and $5.9 million , respectively, in revenue ultimately to be recognized upon delivery of gold. The nine months ended September 30, 2015 and 2014 included $23.9 million and $14.5 million , respectively, of revenue for gold ounces delivered, and $5.6 million and $10.4 million , respectively, in deferred revenue ultimately to be recognized upon delivery of gold.

Other Liabilities

Other Liabilities	9 Months Ended
	Sep. 30, 2015
Other Liabilities [Abstract]
Other Liabilities	Other Liabilities Other liabilities were comprised of the following: September 30, 2015 December 31, 2014 Liabilities for unrecognized tax benefits (1) $ 15.9 $ — Other accrued taxes — 0.4 Employee benefits 4.9 4.8 $ 20.8 $ 5.2 (1) See Note 14 for more information.

Tangible Equity Units ("tMEDS")

Tangible Equity Units ("tMEDS")	9 Months Ended
	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Tangible Equity Units (tMEDS)	Tangible Equity Units ("tMEDS") On May 11, 2012, TCM completed a public offering of 8,800,000 tMEDS with a stated value of $25.00 . Each tMEDS unit consisted of a prepaid common stock purchase contract and a senior amortizing note due May 15, 2015. In June 2014, TCM completed an exchange offer whereby 7,206,862 units, or 86.4% of the then outstanding tMEDS, were tendered for exchange and accepted by TCM. In exchange for the tendered tMEDS, TCM issued 42,129,829 shares of its common stock. On May 15, 2015, the prepaid share purchase contract portion of each outstanding tMED unit was automatically settled at the maximum settlement rate of 5.3879 shares of common stock. TCM issued a total of 6,105,210 shares of common stock in connection with such settlement. TCM also made the final installment payment on the amortizing note portion of each outstanding tMED unit, satisfying in full the principal and interest payments on the tMEDS. The mandatory settlement and final installment payment were made pursuant to the terms of the prospectus dated May 8, 2012, under which the tMEDS were offered in May 2012. As of September 30, 2015, all obligations with respect to the tMEDS had been satisfied and no tMEDS remain outstanding. For each of the three and nine months ended September 30, 2015 , TCM incurred and paid nil and $0.1 million , respectively, in interest expense associated with the tMEDS. For the three and nine months ended September 30, 2014, TCM paid $0.1 million and $1.3 million , respectively, in interest expense and incurred $0.1 million and $1.2 million , respectively, in interest and debt issuance costs associated with the tMEDS.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of September 30, 2015 , TCM has granted stock options, PSUs and RSUs, as discussed below. Stock Options The expiration date and vesting provisions of stock options granted are established at the time an award is made. Stock options vest over 3 years and are exercisable over a period of time not to exceed 10 years from the grant date but generally expire 5 years from the grant date. When an option is exercised, TCM may issue the requisite shares from authorized but unissued common stock, or from treasury stock. The exercise price of options granted prior to March 1, 2011 is equal to the greater of: (i) the volume weighted-average trading price of the underlying shares on the Toronto Stock Exchange ("TSX") over the five consecutive trading days immediately before the grant date, converted to U.S. dollars at the noon exchange rate of the Bank of Canada on the grant date and (ii) if the award date occurs in a trading black-out period, the weighted-average trading price on the TSX over the five consecutive trading days immediately after the black-out period has been lifted. The exercise price of options granted after March 1, 2011 is equal to the volume weighted-average trading price of the underlying shares on the TSX over the five consecutive trading days immediately before the grant date, converted to U.S. dollars at the noon exchange rate of the Bank of Canada on the grant date. The following table summarizes stock option activity during the nine months ended September 30, 2015 : Options Weighted-Average (000's) (1) Stock options outstanding at January 1, 2015 1,386 $ 4.04 Granted 65 $ 0.53 Exercised — $ — Canceled/expired/forfeited (286 ) $ 6.41 Stock options outstanding at September 30, 2015 1,165 $ 3.26 _______________________________________________________________________________ (1) The weighted-average exercise price of options outstanding is shown in US dollars as the majority of the options granted starting in 2011 have a strike price denominated in US dollars. Options with a Canadian dollar strike price have been converted to US dollars for disclosure purposes using the exchange rates on the respective date of grant. For the three and nine months ended September 30, 2015 and September 30, 2014 , TCM recorded compensation expense related to stock options of nil and $0.2 million , respectively. For the three and nine months ended September 30, 2014 , TCM recorded compensation expense related to stock options of $0.1 million and $0.3 million , respectively. As of September 30, 2015 , approximately 0.6 million outstanding options had not vested and were not exercisable. The total unrecognized compensation cost related to these options was $0.3 million as of September 30, 2015 and is expected to be recognized over a weighted-average period of 2.05 years. As of September 30, 2015 , approximately 0.6 million options had vested and were exercisable. The aggregate intrinsic value of these exercisable awards was nil as of September 30, 2015 . Performance Share Units (PSUs) As of September 30, 2015 , TCM had issued a total of 6.1 million PSUs under the Amended and Restated 2010 Long-Term Incentive Plan ("LTIP"), which have been granted to eligible employees. As of September 30, 2015 , 1.9 million of these PSUs have expired or have been forfeited. The vesting of the outstanding PSUs granted subsequent to January 1, 2012 and prior to January 1, 2014 is contingent upon two performance metrics: 1) TCM's Total Shareholder Return (TSR) relative to the Russell 2000 Index during the three -year performance period; and 2) the proven and probable mine reserves replaced by TCM during the three -year performance period as measured by the replacement reserves percentage determined by the plan administrator. The PSUs cliff vest three years from the date of issuance upon achievement of the above metrics. Any PSUs not vested at such time will expire. The vesting of the outstanding PSUs granted subsequent to January 1, 2014 is contingent upon two performance metrics: 1) TCM’s Total Shareholder Return (TSR) relative to the S&P TSX Global Base Metals Index during the three-year period commencing on January 1 of the year in which the grant was made (the “performance period”); and 2) cash flow from operations, defined as TCM’s aggregate “cash generated by (used in) operating activities” less aggregate “capital expenditures,” as reported in the Statements of Cash Flows in the Company’s Annual Report on Form 10-K for each fiscal year in the performance period. The PSUs cliff vest approximately three years from the date of grant, or on the date in the first quarter of the fiscal year immediately succeeding the performance period on which the plan administrator determines and certifies the achievement of the above metrics. Any PSUs not vested at such time will expire. All PSUs granted are accounted for at fair value using a Monte Carlo simulation valuation model on the date of grant. The Monte Carlo model is based on random projections of stock price paths. Expected volatility is calculated using a weighted average of historical daily volatilities and implied volatility and represents the extent to which TCM's stock price performance is expected to fluctuate during the three-year terms of the respective award. For the three and nine months ended September 30, 2015 , TCM recorded compensation expense related to PSUs of $0.9 million and $2.3 million , respectively. For the three and nine months ended September 30, 2014 , TCM recorded compensation expense related to PSUs of $1.0 million and $2.3 million , respectively. As of September 30, 2015 , unrecognized compensation expense related to PSUs totaled $6.7 million that will be recognized on a straight-line basis over a weighted-average period of 2.01 years. The following table summarizes PSU activity during the nine months ended September 30, 2015 : Units Weighted-Average Fair Value (000's) Outstanding at January 1, 2015 1,920 $ 4.59 PSUs granted 2,805 $ 2.04 Canceled/expired/forfeited (502 ) $ 6.98 Outstanding at September 30, 2015 4,223 $ 2.62 Restricted Stock Units (RSUs) As of September 30, 2015 , TCM had issued 5.2 million RSUs to certain eligible employees and directors under the LTIP and under an employment inducement award for the Chief Executive Officer in November 2013. TCM accounts for RSUs at fair value, which is based on the market value of TCM's common shares on the day of grant and recognized over the vesting period of three years. Upon vesting, TCM may issue the requisite shares from authorized but unissued common stock, or from treasury stock. For the three and nine months ended September 30, 2015 , TCM recorded compensation expense related to RSUs of $0.7 million and $2.1 million , respectively. For the three and nine months ended September 30, 2014 , TCM recorded compensation expense related to RSUs of $0.8 million and $1.8 million , respectively. As of September 30, 2015 , unrecognized compensation expense related to RSUs totaled $3.6 million that will be recognized on a straight-line basis over a weighted-average period of 1.92 years. The following table summarizes RSU activity during the nine months ended September 30, 2015 : Units Weighted-Average Fair Value (000's) Outstanding at January 1, 2015 1,455 $ 3.20 RSUs granted 2,218 $ 1.53 RSUs vested and common shares issued (542 ) $ 3.70 Canceled/expired/forfeited (225 ) $ 2.36 Outstanding at September 30, 2015 2,906 $ 1.90

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Matters TCM is from time to time involved in or subject to legal proceedings related to its business. While it is not feasible to predict or determine the outcome of these proceedings, it is the opinion of management that the resolution of such proceedings is not expected to have a material adverse effect on TCM's consolidated financial position, results of operations or cash flows. Concentrate Sales Agreements As of September 30, 2015 , TCM is party to four multi-year concentrate sales agreements for the sale of concentrate produced at Mount Milligan Mine. Pursuant to these agreements, TCM has agreed to sell an aggregate of the copper and gold concentrate produced at Mount Milligan Mine of approximately 140,000 tonnes in 2015, 140,000 tonnes in 2016 and 40,000 tonnes of concentrate for each year in 2017 and 2018. Pricing under these concentrate sales agreements will be determined by reference to specified published reference prices during the applicable quotation periods. Payment for the concentrate will be based on the price for the agreed copper and gold content of the parcels delivered, less smelting and refining charges and certain other deductions, if applicable. The copper smelting and refining charges will be negotiated in good faith and agreed by the parties for each contract year based on terms generally acknowledged as industry benchmark terms. The gold refining charges are as specified in the agreements. Remaining concentrate produced at Mount Milligan Mine will be sold under short-term contracts or on a spot basis. Molybdenum Purchases In the normal course of operations, TCM enters into agreements for the purchase of molybdenum to utilize the upgrading capabilities at its Langeloth facility and generate saleable upgraded molybdenum products. As of September 30, 2015 , TCM had commitments to purchase approximately 7.8 million pounds of molybdenum as unroasted molybdenum concentrate from 2015 to 2017 primarily priced at the time of purchase at a set discount to the market price for roasted molybdenum concentrate. Molybdenum Sales In the normal course of operations, TCM enters into certain molybdenum sales contracts pursuant to which it sells future production at fixed prices. As of September 30, 2015 , TCM had commitments to sell approximately 171.8 thousand pounds of molybdenum oxide in 2015 at an average price of $10.55 per pound. Capital Purchase Commitments As of September 30, 2015 , TCM did not have any open capital purchase commitments.

Income and Mining Tax Expense (

Income and Mining Tax Expense (Benefit)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income and Mining Tax Expense (Benefit)	Income and Mining Tax Expense (Benefit) Income and mining taxes for the three months ended September 30, 2015 and 2014 were a benefit of $17.0 million and $4.8 million , respectively. Income and mining taxes for the nine months ended September 30, 2015 and 2014 were a benefit of $28.6 million and $5.3 million , respectively. Usual drivers of differences for the periods presented between our effective rate and from applying the Canadian federal and provincial income tax rates are due to pre-tax losses from the Endako Mine, which largely have no benefit due to valuation allowances on the associated deferred tax assets, British Columbia mineral taxes and the impact of foreign currency remeasurement on taxes. The tax expense and benefit for the three and nine months ended September 30, 2015 did not contain significant unusual items. The tax benefit for the three and nine months ended September 30, 2014 contained the following significant unusual items: • During the three months ended September 30, 2014, we recognized a deferred tax benefit of $7.4 million due to a change in our tax filing positions related to the construction of Mount Milligan in prior periods. • The tax benefit for the nine months ended September 30, 2014 included a $1.4 million tax benefit due to a successful conclusion to a tax appeal. • The tax benefit for the three and nine months ended September 30, 2014 included a tax benefit of $0.5 million and $2.9 million , respectively, due to an increase in the amount of our deferred taxes that will be realized due to higher taxable income as compared to previous forecasts. In the third quarter of 2015, we received $19.0 million in refunds of which $15.9 million was accounted for as a net liability for unrecognized tax benefits due to an uncertain tax position primarily related to timing differences for certain deductions. These refunds did not have an impact on our 2015 tax benefit.

Net Income (Loss) per Share

Net Income (Loss) per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) per Share	Net (Loss) Income per Share The following is a reconciliation of net (loss) income and weighted-average common shares outstanding for purposes of calculating diluted net (loss) income per share for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net (loss) income $ (60.9 ) $ (11.1 ) $ (147.8 ) $ 11.4 Basic weighted-average number of shares outstanding 221.2 213.9 217.9 186.8 Effect of dilutive securities Share-based awards — — — 0.2 tMEDS — — — 33.1 Diluted weighted-average number of shares outstanding 221.2 213.9 217.9 220.1 Net (loss) income per share Basic $ (0.28 ) $ (0.05 ) $ (0.68 ) $ 0.06 Diluted $ (0.28 ) $ (0.05 ) $ (0.68 ) $ 0.05 For the three and nine months ended September 30, 2015 , TCM was in a net loss position, and approximately 1.2 million stock options, 4.2 million PSUs and 2.9 million RSUs were excluded from the computation of diluted weighted-average shares as the effect would have been anti-dilutive under the treasury stock method. For the three and nine months ended September 30, 2014 , approximately 2.4 million and 2.6 million stock options, respectively, were excluded from the computation of diluted weighted-average shares as the exercise prices exceeded the price of the common stock. For the three and nine months ended September 30, 2014 , approximately 2.3 million PSUs were excluded from the computation of diluted weighted-average shares because the underlying market and performance metrics had not been met. For the three months ended September 30, 2014 , 1.7 million RSUs were excluded from the computation of diluted weighted-average shares as the effect would have been anti-dilutive under the treasury stock method. For the three and nine months ended September 30, 2014 , the assumed issuance of 6.1 million and 33.1 million shares upon the conversion of the stock purchase contract component of the remaining outstanding tMEDS units were considered in the calculation of diluted weighted-average shares; however due to the net loss position of the Company for the three months ended September 30, 2014 , the assumed issuance of 6.1 million has not been reflected above as the effect would be anti-dilutive.

Transactions with our Endako Mi

Transactions with our Endako Mine Joint Venture Partner	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Transactions with our Endako Mine Joint Venture Partner	Transactions with our Endako Mine Joint Venture Partner Total sales by TCM to Sojitz, TCM's Endako Mine joint venture partner, were $4.4 million and $11.9 million for the three and nine months ended September 30, 2015 , respectively. This represented 3.1% and 3.0% of TCM's total revenues for these respective periods. Total sales by TCM to Sojitz were $33.5 million and $87.8 million for the three and nine months ended September 30, 2014 , respectively. This represented 14.6% and 13.7% of TCM's total revenues for these respective periods. For the three and nine months ended September 30, 2015 , TCM recorded insignificant amounts for management fee income and selling and marketing costs from Sojitz. For the three and nine months ended September 30, 2014 , TCM recorded management fee income of $0.1 million and $0.3 million , respectively, and selling and marketing costs of $0.2 million and $0.6 million , respectively, from Sojitz. At September 30, 2015 and December 31, 2014 , TCM's related accounts receivable owing from Sojitz were $0.7 million and $4.1 million , respectively. In connection with the assumption of a sale leaseback described in Note 7, TCM paid $0.3 million to Sojitz for its 25% share of the fair value of the leased equipment and recognized an additional sale-leaseback obligation of $0.5 million .

Supplementary Cash Flow Informa

Supplementary Cash Flow Information	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Supplementary Cash Flow Information	Supplementary Cash Flow Information The following table discloses the change in current assets and current liabilities for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Change in current assets and current liabilities: Accounts receivable $ (19.7 ) $ 19.7 $ (5.2 ) $ (15.1 ) Product inventory 17.8 (11.5 ) 27.9 2.1 Materials and supplies inventory (0.4 ) (1.1 ) (0.4 ) (0.4 ) Prepaid expenses and other current assets (0.4 ) 5.7 (0.2 ) 9.3 Income and mining taxes receivable 3.0 2.5 (0.9 ) 3.1 Accounts payable and accrued liabilities (2.6 ) 0.4 (20.2 ) 1.8 Income and mining taxes payable (1.2 ) (1.3 ) (1.8 ) 0.8 $ (3.5 ) $ 14.4 $ (0.8 ) $ 1.6 Cash interest paid (1) $ 16.3 $ 18.2 $ 60.4 $ 64.4 Income and mining taxes (refunds) payments, net (2) $ (18.0 ) $ 5.4 $ (12.7 ) $ 10.9 _____________________________________________________________________________ (1) For the three and nine months ended September 30, 2015 , cash interest paid of $0.2 million and $1.2 million , respectively, had been previously capitalized related to TCM's debt, as described in Note 8. For the three and nine months ended September 30, 2014 , cash interest paid of $1.3 million and $8.2 million , respectively, had been previously capitalized related to TCM's debt. (2) For the three and nine months ended September 30, 2015 , TCM received $19.0 million in refunds of US and Canadian income taxes related to prior year tax returns, of which $15.9 million has been accounted for as a net liability for unrecognized tax benefits due to an uncertain tax position primarily related to timing differences for certain deductions. For the three and nine months ended September 30, 2014 , TCM received $5.3 million in refunds of US and Canadian income taxes related to prior year tax returns. Non-cash Investing and Financing Activities Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Investing activities Acquisition of property, plant and equipment under the Equipment Facility (see Note 7) $ — $ — $ 9.2 $ — Sale leaseback $ 0.8 $ — $ 0.8 $ — Financing activities Capitalized debt costs (1) $ 0.5 $ — $ 1.1 $ — Long-term lease obligations $ 0.5 $ — $ 8.8 $ — Settlement of tMEDS $ — $ — $ (7.2 ) $ (9.3 ) ____________________________________________________________________________ (1) Included capitalized interest not paid in cash, amortization of deferred financing costs and debt discounts.

Concentration of Credit Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2015
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk TCM is exposed to counterparty risk from its cash and cash equivalent balances and its reclamation deposits held by financial institutions and governmental entities. TCM monitors its positions with, and the credit quality of, the financial institutions and companies in which it invests its cash, cash equivalents and that hold its reclamation deposits. Counterparties to cash balances and its reclamation deposits, other than balances maintained in various bank operating accounts, are US and Canadian institutions and the US and Canadian governments. TCM manages its credit risk from its accounts receivable through its collection activities. As of September 30, 2015 , TCM had four customers who owed TCM more than $3.0 million each and collectively accounted for approximately 84.3% of total accounts and other receivables outstanding. As of September 30, 2015 we did not have any customers with balances greater than $1.0 million each but less than $3.0 million . As of September 30, 2015 , all of these customers were compliant with credit terms and scheduled payment dates. TCM's maximum counterparty and credit risk exposure is the carrying value of its cash and cash equivalents and accounts receivable. The carrying amounts of accounts receivable, accounts payable, accrued liabilities and fixed-rate debt, excluding the 2017 Notes, 2018 Notes and 2019 Notes, as discussed in Note 6, approximate fair value as of September 30, 2015 .

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information TCM has three reportable segments, based on products and geography: Copper-Gold, US Molybdenum and Canadian Molybdenum. The Copper-Gold segment represents the Mount Milligan Mine and includes the sale of copper-gold products, net of refining costs and all expenditures, including all mining, milling, on-site general and administration, transportation and warehousing. The US Molybdenum segment includes all US molybdenum sales and tolling and calcining revenue, all Langeloth roasting and on-site general and administration expenditures and all expenditures from TC Mine, which was placed on care and maintenance in December 2014, including all mine site general and administration and stripping costs and costs for idle mining operations. The Canadian Molybdenum segment which consists of the 75% owned Endako Mine, which was placed on temporary suspension effective December 31, 2014 and care and maintenance effective July 1, 2015, includes 75% of all Canadian molybdenum sales as well as TCM's 75% share of expenditures from the Endako Mine, including all mine site general and administration costs, transportation costs, and costs for idle mining operations. The costs related to care and maintenance at TC Mine for the three and nine months ended September 30, 2015, our 75% share of the temporary suspension and care and maintenance costs at Endako Mine for the three and nine months ended September 30, 2015, and our 75% share of the one-time severance costs of $6.7 million relating to the placement of Endako Mine on care and maintenance are reflected in costs for idle mining operations in the statements of operations. The inter-segment represents the elimination of intercompany transactions between the Langeloth Facility and the corporate entity for the three and nine months ended September 30, 2015 and the elimination of intercompany transactions between TC Mine, the Langeloth Facility and the corporate entity for the three and nine months ended September 30, 2014. TCM's chief operating decision makers (President and CEO, CFO) evaluate segment performance based on segment revenue less costs and expenses. TCM attributes other income and expenses to the reporting segments if the income or expense is directly related to segment operations, as described above. TCM does not allocate corporate expenditures such as general and administrative, exploration and interest income and expense items to its reporting segments, unless such expenditures are directly related to segment operations. Gains and losses on foreign exchange are calculated on transactions denominated in a different currency than the segment's functional currency; the Copper-Gold segment's unrealized foreign exchange balance is primarily comprised of its intercompany notes. Segment information for the three and nine months ended September 30, 2015 and 2014 was as follows: For the three months ended September 30, 2015 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 43.5 $ — $ — $ — $ 43.5 Gold sales 69.5 — — — 69.5 Molybdenum sales — 18.6 4.4 — 23.0 Tolling, calcining and other — 5.8 — (0.1 ) 5.7 113.0 24.4 4.4 (0.1 ) 141.7 Cost and expenses Operating expenses 58.1 27.9 2.6 (0.1 ) 88.5 Depreciation, depletion and amortization 28.1 2.5 0.1 (0.2 ) 30.5 Cost of sales 86.2 30.4 2.7 (0.3 ) 119.0 Selling and marketing 2.5 0.5 0.1 — 3.1 Accretion expense — 0.2 0.4 — 0.6 Costs for idle mining operations — 1.8 1.7 — 3.5 88.7 32.9 4.9 (0.3 ) 126.2 Segment operating income (loss) 24.3 (8.5 ) (0.5 ) 0.2 15.5 Other segment (income) expense Loss (gain) on foreign exchange 15.5 — (1.1 ) — 14.4 Segment income (loss) before income and mining taxes $ 8.8 $ (8.5 ) $ 0.6 $ 0.2 $ 1.1 For the three months ended September 30, 2014 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 45.7 $ — $ — $ — $ 45.7 Gold sales 55.0 — — — 55.0 Molybdenum sales — 87.9 36.5 (0.1 ) 124.3 Tolling, calcining and other — 6.0 — (1.7 ) 4.3 100.7 93.9 36.5 (1.8 ) 229.3 Cost and expenses Operating expenses 47.4 56.2 31.7 (1.9 ) 133.4 Depreciation, depletion and amortization 15.5 4.2 3.0 — 22.7 Cost of sales 62.9 60.4 34.7 (1.9 ) 156.1 Selling and marketing 1.1 1.5 1.0 (0.5 ) 3.1 Accretion expense 0.1 0.4 0.4 — 0.9 64.1 62.3 36.1 (2.4 ) 160.1 Segment operating income 36.6 31.6 0.4 0.6 69.2 Other segment (income) expenses Loss (gain) on foreign exchange 8.8 — (1.4 ) — 7.4 Segment income before income and mining taxes $ 27.8 $ 31.6 $ 1.8 $ 0.6 $ 61.8 For the nine months ended September 30, 2015 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 125.0 $ — $ — $ — $ 125.0 Gold sales 161.8 — — — $ 161.8 Molybdenum sales — 76.9 9.8 — $ 86.7 Tolling, calcining and other — 25.7 — (0.4 ) $ 25.3 286.8 102.6 9.8 (0.4 ) 398.8 Cost and expenses Operating expenses 141.5 99.5 6.2 (0.4 ) 246.8 Depreciation, depletion and amortization 65.2 11.5 0.5 — 77.2 Cost of sales 206.7 111.0 6.7 (0.4 ) 324.0 Selling and marketing 6.3 1.7 0.3 — 8.3 Accretion expense 0.2 0.5 1.1 — 1.8 Costs for idle mining operations — 6.0 15.2 — 21.2 213.2 119.2 23.3 (0.4 ) 355.3 Segment operating income (loss) 73.6 (16.6 ) (13.5 ) — 43.5 Other segment (income) expense Loss (gain) on foreign exchange 28.5 — (2.6 ) — 25.9 Segment income (loss) before income and mining taxes $ 45.1 $ (16.6 ) $ (10.9 ) $ — $ 17.6 For the nine months ended September 30, 2014 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 140.3 $ — $ — $ — $ 140.3 Gold sales 133.5 — — — 133.5 Molybdenum sales — 264.2 94.1 (4.8 ) 353.5 Tolling, calcining and other — 15.8 — (4.4 ) 11.4 273.8 280.0 94.1 (9.2 ) 638.7 Cost and expenses Operating expenses 159.9 163.5 81.0 (9.2 ) 395.2 Depreciation, depletion and amortization 48.6 16.4 12.7 — 77.7 Cost of sales 208.5 179.9 93.7 (9.2 ) 472.9 Selling and marketing 4.6 4.8 2.7 (1.3 ) 10.8 Accretion expense 0.3 1.1 1.3 — 2.7 213.4 185.8 97.7 (10.5 ) 486.4 Segment operating income (loss) 60.4 94.2 (3.6 ) 1.3 152.3 Other segment (income) expenses Loss (gain) on foreign exchange 10.1 — (1.2 ) — 8.9 Segment income (loss) before income and mining taxes $ 50.3 $ 94.2 $ (2.4 ) $ 1.3 $ 143.4 For the three and nine months ended September 30, 2015 and 2014 : Reconciliation of Segment Income to Net (Loss) Income Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Segment income $ 1.1 $ 61.8 $ 17.6 $ 143.4 Other expense (income) General and administrative 4.6 5.1 15.1 16.9 Exploration — 0.3 0.1 0.6 Interest expense, net 21.3 22.5 66.1 69.2 Loss on foreign exchange 54.4 52.9 114.2 55.6 Corporate depreciation 0.4 — 0.5 0.6 Loss from debt extinguishment — — 2.8 0.5 Other (1.7 ) (3.1 ) (4.8 ) (6.1 ) (Loss) income before income and mining taxes (77.9 ) (15.9 ) (176.4 ) 6.1 Income and mining tax benefit (17.0 ) (4.8 ) (28.6 ) (5.3 ) Net (loss) income $ (60.9 ) $ (11.1 ) $ (147.8 ) $ 11.4 Other segment information regarding capital expenditures, assets and liabilities, including the assets and liabilities attributed to corporate operations, was as follows: As of September 30, 2015 Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Capital expenditures (1) $ 43.7 $ 3.9 $ 0.2 — $ 47.8 Property, plant, equipment and development (3) $ 1,786.4 $ 112.5 $ 23.8 $ 0.4 $ 1,923.1 Assets $ 2,004.0 $ 334.4 $ 49.1 $ 61.1 $ 2,448.6 Liabilities $ 879.3 $ 31.4 $ 18.3 $ 925.5 $ 1,854.5 As of December 31, 2014 Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Capital expenditures (2) $ 77.0 $ 4.0 $ 1.1 $ — $ 82.1 Property, plant, equipment and development (3) $ 2,075.3 $ 114.4 $ 27.5 $ 1.1 $ 2,218.3 Assets $ 2,304.1 $ 444.3 $ 77.6 $ 20.3 $ 2,846.3 Liabilities $ 912.0 $ 33.8 $ 30.5 $ 982.5 $ 1,958.8 __________________________________________________________________________ (1) Capital expenditures were for the nine months ended September 30, 2015. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $4.2 million for engineering and site-preparation expenditures relating to the permanent secondary crusher, $24.6 million for operating capital, $13.0 million for the one-time settlement of certain construction claims in July 2015 and $1.9 million for the payment of accruals related to the permanent operations residence. (2) Capital expenditures were for the year ended December 31, 2014. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $29.8 million for the permanent operations residence, $30.9 million for operating capital and $16.3 million for project capital (related to the payment of accruals from December 31, 2013). Total cash capital expenditures during 2014 included $21.0 million in payments of amounts accrued at December 31, 2013. (3) Includes exploration properties.

Guarantor Financial Information

Guarantor Financial Information	9 Months Ended
	Sep. 30, 2015
Product Warranties Disclosures [Abstract]
Guarantor Financial Information	Guarantor Financial Information TCM has not presented separate combined financial statements of subsidiary guarantors that guarantee the 2017 Notes, 2018 Notes and 2019 Notes, because (1) each of the subsidiary guarantors is wholly owned by TCM; (2) the guarantees are full and unconditional; (3) the guarantees are joint and several; and (4) TCM has no independent assets and operations, and all subsidiaries of TCM other than the subsidiary guarantors are immaterial. Pursuant to the indentures governing the 2017 Notes, 2018 Notes and 2019 Notes, a guarantor may be released from its guarantee obligations only under certain customary circumstances specified in the indentures, namely upon (1) the sale or other disposition (including by way of merger, amalgamation or consolidation) of such guarantor, (2) the designation of such guarantor as an unrestricted subsidiary in accordance with the terms of the indentures, (3) upon a legal defeasance or covenant defeasance or (4) upon the full satisfaction of TCM's obligations under the respective indenture.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q. In compliance with those instructions, certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States ("US GAAP") have been condensed or omitted. This report should be read in conjunction with the Thompson Creek Metals Company Inc. ("TCM," "Company," "we," "us" or "our") consolidated financial statements and notes contained in its Annual Report on Form 10-K for the year ended December 31, 2014 (the "2014 Form 10-K") filed with the Securities and Exchange Commission ("SEC"). The information reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for the interim periods reported. Operating results for the three and nine months ended September 30, 2015 are not necessarily indicative of the results that may be expected for any other quarter or for the year ending December 31, 2015. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. TCM bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ significantly from these estimates under different assumptions or conditions.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable are carried at their estimated collectible amounts and were comprised of the following: September 30, 2015 December 31, 2014 Receivables Trade receivables $ 53.8 $ 41.0 Mark-to-market adjustments on trade receivables relating to provisional invoices for Mount Milligan Mine copper and gold concentrate sales (4.9 ) (3.5 ) Goods and services sales tax refunds 1.1 2.0 Settlement receivables on hedges and other miscellaneous receivables 2.0 2.5 $ 52.0 $ 42.0 Related party receivables 0.7 4.1 $ 52.7 $ 46.1

Inventory (Tables)

Inventory (Tables)	9 Months Ended
	Sep. 30, 2015
Inventory Disclosure [Abstract]
Schedule of Carrying Value of Product Inventory	The carrying value of product inventory was as follows: September 30, 2015 December 31, 2014 Copper and Gold Inventory Concentrate $ 7.1 $ 29.4 Stockpiled ore 14.0 8.3 $ 21.1 $ 37.7 Molybdenum Inventory Finished product $ 9.4 $ 45.0 Work-in-process 13.8 13.5 Stockpiled ore 0.4 0.4 $ 23.6 $ 58.9 $ 44.7 $ 96.6
Inventory Write Downs	The following table sets forth the write downs of TCM's molybdenum inventory in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss for the three and nine months ended September 30, 2015 : Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 US Molybdenum Operating expense $ 4.7 $ — $ 10.3 $ — Depreciation, depletion and amortization 0.1 — 0.5 — Canadian Molybdenum Operating expense — 2.3 1.4 8.9 Depreciation, depletion and amortization — 0.3 0.1 1.7 $ 4.8 $ 2.6 $ 12.3 $ 10.6

Property, Plant, Equipment an30

Property, Plant, Equipment and Development, Net (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant, Equipment and Development	Property, plant, equipment and development, net, was comprised of the following: September 30, 2015 December 31, 2014 Mining properties and mineral reserves $ 641.6 $ 703.7 Mining and milling equipment and facilities (1) 1,323.2 1,523.4 Processing facilities 171.8 171.1 Construction-in-progress (2) 39.4 23.1 Other 9.9 6.5 2,185.9 2,427.8 Less: Accumulated depreciation, depletion and amortization (262.8 ) (209.5 ) $ 1,923.1 $ 2,218.3 (1) As of September 30, 2015 , mining and milling equipment and facilities included $13.0 million related to the July 2015 settlement of outstanding claims from two contractors that provided construction and installation services for the Mount Milligan project. (2) The construction-in-progress balances consisted primarily of projects at Mount Milligan Mine.

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Location and Fair Value Amounts of all Derivative Financial Instruments in the Consolidated Balance sheets	The following table sets forth the fair values of TCM's derivative assets and liabilities: Fair Value as of September 30, 2015 December 31, 2014 Assets (1) Commodity contracts $ 0.5 $ 1.8 Provisionally-priced sales 1.6 — Total $ 2.1 $ 1.8 Liabilities (1) Commodity contracts $ 0.4 $ — Provisionally-priced contracts $ 5.0 $ — Forward currency contracts $ 2.0 $ 0.3 Total 7.4 0.3 _____________________________________________________________________________ (1) TCM's derivative assets are included in prepaid expenses and other current assets, and derivative liabilities are included in other current liabilities on its condensed consolidated balance sheets. TCM is exposed to credit risk when counterparties with whom it has entered into derivative transactions are unable to satisfy their obligations. To reduce counterparty credit exposure, TCM deals primarily with large, credit-worthy financial institutions and companies. TCM believes the counterparties to the contracts to be credit-worthy entities and, therefore, TCM believes credit risk of counterparty non-performance is relatively low, and, as such, the fair value of the derivatives has not been adjusted.
Schedule of Gains (Losses) on Derivative Instruments	The following table sets forth the gains (losses) on derivative instruments for the periods presented: Three Months Ended Nine Months Ended Derivative Type and Activity Statement of Operations Classification September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Gold hedges related to Gold Stream Arrangement Gold sales $ (0.9 ) $ (0.7 ) $ (0.4 ) $ (0.4 ) Provisional priced MTM gold sales Gold sales $ (0.4 ) $ (2.8 ) $ (1.1 ) $ (1.9 ) Provisional priced MTM copper sales Copper sales $ (1.5 ) $ (4.1 ) $ (0.3 ) $ (1.9 ) Copper and Gold hedges; other commodity contracts Other $ 1.6 $ 2.9 $ 4.7 $ 2.8 Forward currency contracts Gain (loss) on foreign exchange, net $ (3.3 ) $ (0.5 ) $ (4.0 ) $ 0.2
Schedule of Commodity Contracts	The following table provides details of TCM's commodity contracts as of September 30, 2015 : Quantity Sell Price Buy Price Maturities Through Gold Hedge Purchases related to Gold Stream Arrangement (oz) 44,520 TBD $1,094 - $1,202 October 2015 - February 2016 Forward Gold Sales (oz) 17,000 $1,130 N/A October 2015 - June 2016 Forward Copper Sales (lb) 4,409,240 $2.40 - $2.45 N/A October 2015 - November 2015 Fuel Hedges (gallons) 1,965,000 N/A $1.90 - $2.00 October 2015 - December 2016 Quantity Put Price Call Price Maturities Through Gold Collars (oz) 22,500 $1,050 - $1,200 $1,151 - $1,360 October 2015 - August 2016 Copper Collars (lb) 6,613,860 $2.00 $2.99 October 2015 - December 2015
Schedule of Outstanding Provisionally-Priced Contracts	The following table sets forth TCM's outstanding provisionally-priced contracts as of September 30, 2015 : Average Price Per Unit Open Positions Market Price Contract Maturities Through Embedded derivatives in provisional sales contracts Copper (millions of pounds) 29.9 TBD TBD January 2016 Gold (ounces) 44,729 TBD TBD November 2015 Embedded derivatives in provisional purchase contracts Molybdenum (millions of pounds) 1.6 N/A TBD November 2015
Schedule of Forward Currency Contracts	The following table provides details of TCM's forward currency contracts as of September 30, 2015 : Notional Amount Buy Price Maturities Through Forward currency contracts C$80,000,000 $1USD/C$1.29 October 2015 - May 2016
Schedule of Outstanding Fixed-Priced Molybdenum Sales Contracts	The following table sets forth TCM's outstanding molybdenum fixed-priced sales contracts as of September 30, 2015 : Quantity (000's lb) Sell Price Maturities Through Molybdenum fixed price sales 171.8 $10.55 December 2015

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Schedule of Reconciliation of the Fair Value of Level 3 Financial Assets and Liabilities	The following table sets forth a reconciliation of activity related to Level 3 financial liabilities for the nine months ended September 30, 2015 : Debt Balance at January 1, 2015 $ 0.4 Settlement of tMEDS (0.4 ) Balance at September 30, 2015 $ —
Schedule of Liabilities Measured at Fair Value on a Recurring Basis	The following table sets forth TCM's financial assets and liabilities measured at fair value by level within the fair value hierarchy. As required, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement, as discussed in Note 2 to the 2014 Form 10-K. Fair Value at September 30, 2015 Total Level 1 Level 2 Level 3 Assets Commodity contracts $ 0.5 $ — $ 0.5 $ — Provisionally-priced sales 1.6 — 1.6 — $ 2.1 $ — $ 2.1 $ — Liabilities Senior secured notes $ 287.1 $ — $ 287.1 $ — Senior unsecured notes 254.1 — 254.1 — Commodity contracts 0.4 — 0.4 — Provisionally-priced contracts 5.0 — 5.0 — Forward currency contracts 2.0 2.0 — — $ 548.6 $ 2.0 $ 546.6 $ — Fair Value at December 31, 2014 Total Level 1 Level 2 Level 3 Assets Commodity contracts $ 1.8 $ — $ 1.8 $ — $ 1.8 $ — $ 1.8 $ — Liabilities Senior secured notes $ 393.2 $ — $ 393.2 $ — Senior unsecured notes 453.3 — 453.3 — tMEDS 0.4 — — 0.4 Forward currency contracts 0.3 0.3 — — $ 847.2 $ 0.3 $ 846.5 $ 0.4

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2015
Leases, Capital [Abstract]
Schedule of Future Lease Payments Under Capital Leases	TCM's total capital lease obligations consisted of the following: September 30, 2015 December 31, 2014 Equipment Facility capital leases $ 22.4 $ 20.3 Equipment Facility sale leaseback 35.0 45.9 Sale leaseback 1.9 2.3 Total lease obligations 59.3 68.5 Less: Current portion (25.5 ) (22.8 ) Total long-term lease obligations $ 33.8 $ 45.7
Schedule of Interest Costs Incurred	Interest and debt issuance costs on the equipment financings, as described above, consisted of the following: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 0.9 $ 1.1 $ 2.8 $ 3.6 Interest and debt issuance costs expensed $ 1.0 $ 1.2 $ 3.3 $ 3.9 Interest paid, capitalized and expensed was as follows: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 15.4 $ 17.1 $ 57.6 $ 60.8 Interest capitalized $ 0.5 $ 1.4 $ 1.1 $ 3.3 Interest expensed $ 20.3 $ 21.3 $ 62.9 $ 65.5

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	TCM's secured and unsecured notes, tMEDS and equipment loans consisted of the following: September 30, 2015 December 31, 2014 9.75% Senior secured notes due 2017, net of discount $ 314.4 $ 347.9 7.375% Senior unsecured notes due 2018 334.1 335.8 12.5% Senior unsecured notes due 2019 183.0 188.5 tMEDS — 1.2 Equipment loans 0.7 2.8 Total debt 832.2 876.2 Less: Current portion (0.7 ) (3.9 ) Total long-term debt $ 831.5 $ 872.3
Schedule of Interest Costs Incurred	Interest and debt issuance costs on the equipment financings, as described above, consisted of the following: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 0.9 $ 1.1 $ 2.8 $ 3.6 Interest and debt issuance costs expensed $ 1.0 $ 1.2 $ 3.3 $ 3.9 Interest paid, capitalized and expensed was as follows: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Interest paid $ 15.4 $ 17.1 $ 57.6 $ 60.8 Interest capitalized $ 0.5 $ 1.4 $ 1.1 $ 3.3 Interest expensed $ 20.3 $ 21.3 $ 62.9 $ 65.5

Gold Stream Arrangement (Tables

Gold Stream Arrangement (Tables)	9 Months Ended
	Sep. 30, 2015
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Revenue Recognition Gold Stream Arrangement	The following table presents the revenue under the Gold Stream Arrangement for the three and nine months ended September 30, 2015 and 2014, respectively, in the form of (i) cash receipts based on gold sales during the applicable period, and (ii) deferred revenue for gold ounces delivered and deferred revenue to be recognized upon final settlement during the applicable period: Three Months Ended Nine Months Ended (US$ in millions) September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Gold sales related to cash portion of Gold Stream Arrangement $ 17.0 $ 13.0 $ 38.4 $ 30.2 Gold sales related to deferred portion of Gold Stream Arrangement (1) 13.1 10.8 29.5 24.9 Total gold sales under Gold Stream Arrangement (1) $ 30.1 $ 23.8 $ 67.9 $ 55.1 _____________________________________________________________________________ (1) The three months ended September 30, 2015 and 2014 included $8.0 million and $4.9 million , respectively, of revenue for gold ounces delivered, and $5.1 million and $5.9 million , respectively, in revenue ultimately to be recognized upon delivery of gold. The nine months ended September 30, 2015 and 2014 included $23.9 million and $14.5 million , respectively, of revenue for gold ounces delivered, and $5.6 million and $10.4 million , respectively, in deferred revenue ultimately to be recognized upon delivery of gold.

Other Liabilities (Tables)

Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Other Liabilities [Abstract]
Other Liabilities	Other liabilities were comprised of the following: September 30, 2015 December 31, 2014 Liabilities for unrecognized tax benefits (1) $ 15.9 $ — Other accrued taxes — 0.4 Employee benefits 4.9 4.8 $ 20.8 $ 5.2

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes stock option activity during the nine months ended September 30, 2015 : Options Weighted-Average (000's) (1) Stock options outstanding at January 1, 2015 1,386 $ 4.04 Granted 65 $ 0.53 Exercised — $ — Canceled/expired/forfeited (286 ) $ 6.41 Stock options outstanding at September 30, 2015 1,165 $ 3.26 _______________________________________________________________________________ (1) The weighted-average exercise price of options outstanding is shown in US dollars as the majority of the options granted starting in 2011 have a strike price denominated in US dollars. Options with a Canadian dollar strike price have been converted to US dollars for disclosure purposes using the exchange rates on the respective date of grant.
Summary of Performance Share Unit (PSU) Activity	The following table summarizes PSU activity during the nine months ended September 30, 2015 : Units Weighted-Average Fair Value (000's) Outstanding at January 1, 2015 1,920 $ 4.59 PSUs granted 2,805 $ 2.04 Canceled/expired/forfeited (502 ) $ 6.98 Outstanding at September 30, 2015 4,223 $ 2.62
Summary of Restricted Stock Unit (RSU) Activity	The following table summarizes RSU activity during the nine months ended September 30, 2015 : Units Weighted-Average Fair Value (000's) Outstanding at January 1, 2015 1,455 $ 3.20 RSUs granted 2,218 $ 1.53 RSUs vested and common shares issued (542 ) $ 3.70 Canceled/expired/forfeited (225 ) $ 2.36 Outstanding at September 30, 2015 2,906 $ 1.90

Net Income (Loss) per Share (Ta

Net Income (Loss) per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of Reconciliation of Net Income and Weighted-Average Common Shares Outstanding for Purposes of Calculating Diluted Net Income per Share	The following is a reconciliation of net (loss) income and weighted-average common shares outstanding for purposes of calculating diluted net (loss) income per share for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Net (loss) income $ (60.9 ) $ (11.1 ) $ (147.8 ) $ 11.4 Basic weighted-average number of shares outstanding 221.2 213.9 217.9 186.8 Effect of dilutive securities Share-based awards — — — 0.2 tMEDS — — — 33.1 Diluted weighted-average number of shares outstanding 221.2 213.9 217.9 220.1 Net (loss) income per share Basic $ (0.28 ) $ (0.05 ) $ (0.68 ) $ 0.06 Diluted $ (0.28 ) $ (0.05 ) $ (0.68 ) $ 0.05

Supplementary Cash Flow Infor39

Supplementary Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplementary Cash Flow Information	The following table discloses the change in current assets and current liabilities for the three and nine months ended September 30, 2015 and 2014: Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Change in current assets and current liabilities: Accounts receivable $ (19.7 ) $ 19.7 $ (5.2 ) $ (15.1 ) Product inventory 17.8 (11.5 ) 27.9 2.1 Materials and supplies inventory (0.4 ) (1.1 ) (0.4 ) (0.4 ) Prepaid expenses and other current assets (0.4 ) 5.7 (0.2 ) 9.3 Income and mining taxes receivable 3.0 2.5 (0.9 ) 3.1 Accounts payable and accrued liabilities (2.6 ) 0.4 (20.2 ) 1.8 Income and mining taxes payable (1.2 ) (1.3 ) (1.8 ) 0.8 $ (3.5 ) $ 14.4 $ (0.8 ) $ 1.6 Cash interest paid (1) $ 16.3 $ 18.2 $ 60.4 $ 64.4 Income and mining taxes (refunds) payments, net (2) $ (18.0 ) $ 5.4 $ (12.7 ) $ 10.9 _____________________________________________________________________________ (1) For the three and nine months ended September 30, 2015 , cash interest paid of $0.2 million and $1.2 million , respectively, had been previously capitalized related to TCM's debt, as described in Note 8. For the three and nine months ended September 30, 2014 , cash interest paid of $1.3 million and $8.2 million , respectively, had been previously capitalized related to TCM's debt. (2) For the three and nine months ended September 30, 2015 , TCM received $19.0 million in refunds of US and Canadian income taxes related to prior year tax returns, of which $15.9 million has been accounted for as a net liability for unrecognized tax benefits due to an uncertain tax position primarily related to timing differences for certain deductions. For the three and nine months ended September 30, 2014 , TCM received $5.3 million in refunds of US and Canadian income taxes related to prior year tax returns.
Schedule of Non-Cash Investing and Financing Activities	Non-cash Investing and Financing Activities Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Investing activities Acquisition of property, plant and equipment under the Equipment Facility (see Note 7) $ — $ — $ 9.2 $ — Sale leaseback $ 0.8 $ — $ 0.8 $ — Financing activities Capitalized debt costs (1) $ 0.5 $ — $ 1.1 $ — Long-term lease obligations $ 0.5 $ — $ 8.8 $ — Settlement of tMEDS $ — $ — $ (7.2 ) $ (9.3 ) ____________________________________________________________________________ (1) Included capitalized interest not paid in cash, amortization of deferred financing costs and debt discounts

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule of Segment Information	Segment information for the three and nine months ended September 30, 2015 and 2014 was as follows: For the three months ended September 30, 2015 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 43.5 $ — $ — $ — $ 43.5 Gold sales 69.5 — — — 69.5 Molybdenum sales — 18.6 4.4 — 23.0 Tolling, calcining and other — 5.8 — (0.1 ) 5.7 113.0 24.4 4.4 (0.1 ) 141.7 Cost and expenses Operating expenses 58.1 27.9 2.6 (0.1 ) 88.5 Depreciation, depletion and amortization 28.1 2.5 0.1 (0.2 ) 30.5 Cost of sales 86.2 30.4 2.7 (0.3 ) 119.0 Selling and marketing 2.5 0.5 0.1 — 3.1 Accretion expense — 0.2 0.4 — 0.6 Costs for idle mining operations — 1.8 1.7 — 3.5 88.7 32.9 4.9 (0.3 ) 126.2 Segment operating income (loss) 24.3 (8.5 ) (0.5 ) 0.2 15.5 Other segment (income) expense Loss (gain) on foreign exchange 15.5 — (1.1 ) — 14.4 Segment income (loss) before income and mining taxes $ 8.8 $ (8.5 ) $ 0.6 $ 0.2 $ 1.1 For the three months ended September 30, 2014 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 45.7 $ — $ — $ — $ 45.7 Gold sales 55.0 — — — 55.0 Molybdenum sales — 87.9 36.5 (0.1 ) 124.3 Tolling, calcining and other — 6.0 — (1.7 ) 4.3 100.7 93.9 36.5 (1.8 ) 229.3 Cost and expenses Operating expenses 47.4 56.2 31.7 (1.9 ) 133.4 Depreciation, depletion and amortization 15.5 4.2 3.0 — 22.7 Cost of sales 62.9 60.4 34.7 (1.9 ) 156.1 Selling and marketing 1.1 1.5 1.0 (0.5 ) 3.1 Accretion expense 0.1 0.4 0.4 — 0.9 64.1 62.3 36.1 (2.4 ) 160.1 Segment operating income 36.6 31.6 0.4 0.6 69.2 Other segment (income) expenses Loss (gain) on foreign exchange 8.8 — (1.4 ) — 7.4 Segment income before income and mining taxes $ 27.8 $ 31.6 $ 1.8 $ 0.6 $ 61.8 For the nine months ended September 30, 2015 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 125.0 $ — $ — $ — $ 125.0 Gold sales 161.8 — — — $ 161.8 Molybdenum sales — 76.9 9.8 — $ 86.7 Tolling, calcining and other — 25.7 — (0.4 ) $ 25.3 286.8 102.6 9.8 (0.4 ) 398.8 Cost and expenses Operating expenses 141.5 99.5 6.2 (0.4 ) 246.8 Depreciation, depletion and amortization 65.2 11.5 0.5 — 77.2 Cost of sales 206.7 111.0 6.7 (0.4 ) 324.0 Selling and marketing 6.3 1.7 0.3 — 8.3 Accretion expense 0.2 0.5 1.1 — 1.8 Costs for idle mining operations — 6.0 15.2 — 21.2 213.2 119.2 23.3 (0.4 ) 355.3 Segment operating income (loss) 73.6 (16.6 ) (13.5 ) — 43.5 Other segment (income) expense Loss (gain) on foreign exchange 28.5 — (2.6 ) — 25.9 Segment income (loss) before income and mining taxes $ 45.1 $ (16.6 ) $ (10.9 ) $ — $ 17.6 For the nine months ended September 30, 2014 : Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Revenues Copper sales $ 140.3 $ — $ — $ — $ 140.3 Gold sales 133.5 — — — 133.5 Molybdenum sales — 264.2 94.1 (4.8 ) 353.5 Tolling, calcining and other — 15.8 — (4.4 ) 11.4 273.8 280.0 94.1 (9.2 ) 638.7 Cost and expenses Operating expenses 159.9 163.5 81.0 (9.2 ) 395.2 Depreciation, depletion and amortization 48.6 16.4 12.7 — 77.7 Cost of sales 208.5 179.9 93.7 (9.2 ) 472.9 Selling and marketing 4.6 4.8 2.7 (1.3 ) 10.8 Accretion expense 0.3 1.1 1.3 — 2.7 213.4 185.8 97.7 (10.5 ) 486.4 Segment operating income (loss) 60.4 94.2 (3.6 ) 1.3 152.3 Other segment (income) expenses Loss (gain) on foreign exchange 10.1 — (1.2 ) — 8.9 Segment income (loss) before income and mining taxes $ 50.3 $ 94.2 $ (2.4 ) $ 1.3 $ 143.4
Schedule of Reconciliation of Segment Income to Net Income	For the three and nine months ended September 30, 2015 and 2014 : Reconciliation of Segment Income to Net (Loss) Income Three Months Ended Nine Months Ended September 30, 2015 September 30, 2014 September 30, 2015 September 30, 2014 Segment income $ 1.1 $ 61.8 $ 17.6 $ 143.4 Other expense (income) General and administrative 4.6 5.1 15.1 16.9 Exploration — 0.3 0.1 0.6 Interest expense, net 21.3 22.5 66.1 69.2 Loss on foreign exchange 54.4 52.9 114.2 55.6 Corporate depreciation 0.4 — 0.5 0.6 Loss from debt extinguishment — — 2.8 0.5 Other (1.7 ) (3.1 ) (4.8 ) (6.1 ) (Loss) income before income and mining taxes (77.9 ) (15.9 ) (176.4 ) 6.1 Income and mining tax benefit (17.0 ) (4.8 ) (28.6 ) (5.3 ) Net (loss) income $ (60.9 ) $ (11.1 ) $ (147.8 ) $ 11.4
Schedule of Other Segment Information Regarding Capital Expenditures, Assets and Liabilities, Including the Assets and Liabilities Attributed to Corporate Operations	Other segment information regarding capital expenditures, assets and liabilities, including the assets and liabilities attributed to corporate operations, was as follows: As of September 30, 2015 Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Capital expenditures (1) $ 43.7 $ 3.9 $ 0.2 — $ 47.8 Property, plant, equipment and development (3) $ 1,786.4 $ 112.5 $ 23.8 $ 0.4 $ 1,923.1 Assets $ 2,004.0 $ 334.4 $ 49.1 $ 61.1 $ 2,448.6 Liabilities $ 879.3 $ 31.4 $ 18.3 $ 925.5 $ 1,854.5 As of December 31, 2014 Copper-Gold US Molybdenum Canadian Molybdenum Inter-segment Total Capital expenditures (2) $ 77.0 $ 4.0 $ 1.1 $ — $ 82.1 Property, plant, equipment and development (3) $ 2,075.3 $ 114.4 $ 27.5 $ 1.1 $ 2,218.3 Assets $ 2,304.1 $ 444.3 $ 77.6 $ 20.3 $ 2,846.3 Liabilities $ 912.0 $ 33.8 $ 30.5 $ 982.5 $ 1,958.8 __________________________________________________________________________ (1) Capital expenditures were for the nine months ended September 30, 2015. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $4.2 million for engineering and site-preparation expenditures relating to the permanent secondary crusher, $24.6 million for operating capital, $13.0 million for the one-time settlement of certain construction claims in July 2015 and $1.9 million for the payment of accruals related to the permanent operations residence. (2) Capital expenditures were for the year ended December 31, 2014. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $29.8 million for the permanent operations residence, $30.9 million for operating capital and $16.3 million for project capital (related to the payment of accruals from December 31, 2013). Total cash capital expenditures during 2014 included $21.0 million in payments of amounts accrued at December 31, 2013. (3) Includes exploration properties.

Basis of Presentation (Details)

Basis of Presentation (Details)	Sep. 30, 2015	Dec. 31, 2014
Description of Business
Percentage of ownership interest in project		75.00%
Endako Mine
Description of Business
Percentage of ownership interest in project	75.00%

Accounts Receivable (Details)

Accounts Receivable (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 52	$ 42
Related party receivables	0.7	4.1
Receivables and Related party receivables	52.7	46.1
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	53.8	41
Mark-to-market adjustments on trade receivables relating to provisional invoices for Mount Milligan Mine copper and gold concentrate sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	(4.9)	(3.5)
Goods and services sales tax refunds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	1.1	2
Settlement receivables on hedges and other miscellaneous receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 2	$ 2.5

Inventory (Details)

Inventory (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Inventory [Line Items]
Concentrate	$ 7.1		$ 7.1		$ 29.4
Stockpiled ore	14		14		8.3
Copper and Gold Inventory	21.1		21.1		37.7
Finished product	9.4		9.4		45
Work-in-process	13.8		13.8		13.5
Stockpiled ore	0.4		0.4		0.4
Molybdenum Inventory	23.6		23.6		58.9
Product inventory	44.7		44.7		$ 96.6
Product inventory write-downs	4.8	$ 2.6	12.3	$ 10.6
US Molybdenum | Operating expense
Inventory [Line Items]
Product inventory write-downs	4.7	0	10.3	0
US Molybdenum | Depreciation, depletion and amortization
Inventory [Line Items]
Product inventory write-downs	0.1	0	0.5	0
Canadian Molybdenum | Operating expense
Inventory [Line Items]
Product inventory write-downs	0	2.3	1.4	8.9
Canadian Molybdenum | Depreciation, depletion and amortization
Inventory [Line Items]
Product inventory write-downs	$ 0	$ 0.3	$ 0.1	$ 1.7

Property, Plant, Equipment an44

Property, Plant, Equipment and Development, Net (Details) $ in Millions		Sep. 30, 2015USD ($)contractor	Dec. 31, 2014USD ($)
Property, plant and equipment
Property, plant and equipment, gross		$ 2,185.9	$ 2,427.8
Less: Accumulated depreciation, depletion and amortization		(262.8)	(209.5)
Property, plant and equipment, net		1,923.1	2,218.3
Mining properties and mineral reserves
Property, plant and equipment
Property, plant and equipment, gross		641.6	703.7
Mining and milling equipment and facilities
Property, plant and equipment
Property, plant and equipment, gross	[1]	1,323.2	1,523.4
Mining and milling equipment and facilities | Mount Milligan Mine
Property, plant and equipment
Property, plant and equipment, gross	[1]	$ 13
Number of contractors | contractor		2
Processing facilities
Property, plant and equipment
Property, plant and equipment, gross		$ 171.8	171.1
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, gross	[2]	39.4	23.1
Other
Property, plant and equipment
Property, plant and equipment, gross		$ 9.9	$ 6.5
[1]	As of September 30, 2015, mining and milling equipment and facilities included $13.0 million related to the July 2015 settlement of outstanding claims from two contractors that provided construction and installation services for the Mount Milligan project.
[2]	The construction-in-progress balances consisted primarily of projects at Mount Milligan Mine.

Financial Instruments (Location

Financial Instruments (Location and Fair Value of All Derivative Instruments) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivative fair value
Derivative assets	[1]	$ 2.1	$ 1.8
Derivative liabilities	[1]	7.4	0.3
Commodity contracts
Derivative fair value
Derivative assets	[1]	0.5	1.8
Derivative liabilities	[1]	0.4	0
Provisionally-priced sales
Derivative fair value
Derivative assets	[1]	1.6	0
Derivative liabilities	[1]	5	0
Forward currency contracts
Derivative fair value
Derivative liabilities	[1]	$ 2	$ 0.3
[1]	TCM's derivative assets are included in prepaid expenses and other current assets, and derivative liabilities are included in other current liabilities on its condensed consolidated balance sheets. TCM is exposed to credit risk when counterparties with whom it has entered into derivative transactions are unable to satisfy their obligations. To reduce counterparty credit exposure, TCM deals primarily with large, credit-worthy financial institutions and companies. TCM believes the counterparties to the contracts to be credit-worthy entities and, therefore, TCM believes credit risk of counterparty non-performance is relatively low, and, as such, the fair value of the derivatives has not been adjusted.

Financial Instruments (Derivati

Financial Instruments (Derivative Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Commodity contracts | Gold sales
Derivative instruments, gain (loss)
Gain (losses) on derivative instrument	$ (0.9)	$ (0.7)	$ (0.4)	$ (0.4)
Commodity contracts | Other
Derivative instruments, gain (loss)
Gain (losses) on derivative instrument	1.6	2.9	4.7	2.8
Provisional priced MTM sales | Gold sales
Derivative instruments, gain (loss)
Gain (losses) on derivative instrument	(0.4)	(2.8)	(1.1)	(1.9)
Provisional priced MTM sales | Copper sales
Derivative instruments, gain (loss)
Gain (losses) on derivative instrument	(1.5)	(4.1)	(0.3)	(1.9)
Forward currency contracts | Gain (loss) on foreign exchange, net
Derivative instruments, gain (loss)
Gain (losses) on derivative instrument	$ (3.3)	$ (0.5)	$ (4)	$ 0.2

Financial Instruments (Forward

Financial Instruments (Forward Commodity Contracts) (Details) - Commodity contracts	9 Months Ended
	Sep. 30, 2015lboz$ / oz$ / lb$ / galgal
Gold Hedge Purchases related to Gold Stream Arrangement
Derivative [Line Items]
Quantity (mass) | oz	44,520
Gold Hedge Purchases related to Gold Stream Arrangement | Minimum
Derivative [Line Items]
Put Price ($/mass)	1,094
Gold Hedge Purchases related to Gold Stream Arrangement | Maximum
Derivative [Line Items]
Put Price ($/mass)	1,202
Forward Gold Sales
Derivative [Line Items]
Quantity (mass) | oz	17,000
Call Price ($/mass)	1,130
Forward Copper Sales
Derivative [Line Items]
Quantity (mass) | lb	4,409,240
Forward Copper Sales | Minimum
Derivative [Line Items]
Call Price ($/mass) | $ / lb	2.40
Forward Copper Sales | Maximum
Derivative [Line Items]
Call Price ($/mass) | $ / lb	2.45
Fuel Hedges
Derivative [Line Items]
Quantity (volume) | gal	1,965,000
Fuel Hedges | Minimum
Derivative [Line Items]
Put Price ($/mass) | $ / gal	1.90
Fuel Hedges | Maximum
Derivative [Line Items]
Put Price ($/mass) | $ / gal	2
Gold Collars
Derivative [Line Items]
Quantity (mass) | oz	22,500
Gold Collars | Minimum
Derivative [Line Items]
Call Price ($/mass)	1,151
Put Price ($/mass)	1,050
Gold Collars | Maximum
Derivative [Line Items]
Call Price ($/mass)	1,360
Put Price ($/mass)	1,200
Copper Collars
Derivative [Line Items]
Quantity (mass) | lb	6,613,860
Call Price ($/mass) | $ / lb	2.99
Put Price ($/mass) | $ / lb	2

Financial Instruments (Provisio

Financial Instruments (Provisional, Fixed, Forwards Contracts, and Warrant Derivatives) (Details) pound in Millions	Sep. 30, 2015CAD$ / lblbozpoundcontract$ / CAD
Forward currency contracts
Derivative [Line Items]
Open foreign currency option contracts | contract	31
Notional Amount (in CAD) | CAD	CAD 80,000,000
Forward currency contracts | CAD
Derivative [Line Items]
Buy Price (in CAD) | $ / CAD	0.7752
Fixed-priced contracts-current | Supply Commitment
Derivative [Line Items]
Quantity (000's lb) | lb	171,800
Sell Price ($/lb) | $ / lb	10.55
Short | Copper
Derivative [Line Items]
Open Positions Pounds to be Sold/Purchased (lbs)	29.9
Short | Gold
Derivative [Line Items]
Open Positions Pounds to be Sold/Purchased (lbs) | oz	44,729
Long | Molybdenum
Derivative [Line Items]
Open Positions Pounds to be Sold/Purchased (lbs)	1.6

Fair Value Measurement (Details

Fair Value Measurement (Details) - Debt $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Changes in fair value of Level 3 financial assets
Balance at January 1, 2015	$ 0.4
Settlement of tMEDS	(0.4)
Balance at September 30, 2015	$ 0

Fair Value Measurement (Detai50

Fair Value Measurement (Details 1) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Fair value
Derivative assets	[1]	$ 2.1	$ 1.8
Financial liabilities		548.6	847.2
Derivative liabilities	[1]	7.4	0.3
Senior secured notes
Fair value
Financial liabilities		287.1	393.2
Senior unsecured notes
Fair value
Financial liabilities		254.1	453.3
tMEDS
Fair value
Financial liabilities			0.4
Level 1
Fair value
Derivative assets		0	0
Financial liabilities		2	0.3
Level 1 | Senior secured notes
Fair value
Financial liabilities		0	0
Level 1 | Senior unsecured notes
Fair value
Financial liabilities		0	0
Level 1 | tMEDS
Fair value
Financial liabilities			0
Level 2
Fair value
Derivative assets		2.1	1.8
Financial liabilities		546.6	846.5
Level 2 | Senior secured notes
Fair value
Financial liabilities		287.1	393.2
Level 2 | Senior unsecured notes
Fair value
Financial liabilities		254.1	453.3
Level 2 | tMEDS
Fair value
Financial liabilities			0
Level 3
Fair value
Derivative assets		0	0
Financial liabilities		0	0.4
Level 3 | Senior secured notes
Fair value
Financial liabilities		0	0
Level 3 | Senior unsecured notes
Fair value
Financial liabilities		0	0
Commodity contracts
Fair value
Derivative assets	[1]	0.5	1.8
Derivative liabilities	[1]	0.4	0
Commodity contracts | Level 1
Fair value
Derivative assets		0	0
Derivative liabilities		0
Commodity contracts | Level 2
Fair value
Derivative assets		0.5	1.8
Derivative liabilities		0.4
Commodity contracts | Level 3
Fair value
Derivative assets		0	0
Derivative liabilities		0
Provisionally-priced sales
Fair value
Derivative assets	[1]	1.6	0
Derivative liabilities	[1]	5	0
Provisionally-priced sales | Level 1
Fair value
Derivative assets		0
Derivative liabilities		0
Provisionally-priced sales | Level 2
Fair value
Derivative assets		1.6
Derivative liabilities		5
Provisionally-priced sales | Level 3
Fair value
Derivative assets		0
Derivative liabilities		0
Forward currency contracts
Fair value
Derivative liabilities	[1]	2	0.3
Forward currency contracts | Level 1
Fair value
Derivative liabilities		2	0.3
Forward currency contracts | Level 2
Fair value
Derivative liabilities		0	0
Forward currency contracts | Level 3
Fair value
Derivative liabilities		$ 0	$ 0
[1]	TCM's derivative assets are included in prepaid expenses and other current assets, and derivative liabilities are included in other current liabilities on its condensed consolidated balance sheets. TCM is exposed to credit risk when counterparties with whom it has entered into derivative transactions are unable to satisfy their obligations. To reduce counterparty credit exposure, TCM deals primarily with large, credit-worthy financial institutions and companies. TCM believes the counterparties to the contracts to be credit-worthy entities and, therefore, TCM believes credit risk of counterparty non-performance is relatively low, and, as such, the fair value of the derivatives has not been adjusted.

Fair Value Measurement (Narrati

Fair Value Measurement (Narrative) (Details) - shares	May. 15, 2015	Jun. 30, 2014
Fair value
Settlement rate (in shares)	5.3879
tMEDS
Fair value
Settlement of tangible equity units (in shares)	6,105,210	42,129,829

Leases (Details)

Leases (Details)	Sep. 04, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)lease	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)	Mar. 30, 2011USD ($)
Debt Instrument [Line Items]
Total long-term lease obligations		$ 33,800,000		$ 33,800,000		$ 45,700,000
Capital lease obligations incurred		500,000	$ 0	8,800,000	$ 0
Sale leaseback transaction, percentage of lease assumed	25.00%
Endako Mine
Debt Instrument [Line Items]
Sale leaseback transaction, fair value of leased equipment	$ 300,000
Equipment Facility
Debt Instrument [Line Items]
Total lease obligations		59,300,000		59,300,000		68,500,000
Equipment Facility sale leaseback		35,000,000		35,000,000		45,900,000
Less: Current portion		(25,500,000)		(25,500,000)		(22,800,000)
Total long-term lease obligations		$ 33,800,000		$ 33,800,000		45,700,000
Equipment Facility | Minimum
Debt Instrument [Line Items]
Term of borrowing under facility (in months)				48 months
Equipment Facility | Maximum
Debt Instrument [Line Items]
Term of borrowing under facility (in months)				60 months
Equipment Facility | Caterpillar
Debt Instrument [Line Items]
Number of leases | lease				2
Capital lease obligations incurred				$ 8,300,000
Upfront payment				$ 900,000
Interest rate stated percentage		5.70%		5.70%
Equipment Facility | Endako Mine
Debt Instrument [Line Items]
Equipment Facility sale leaseback		$ 1,900,000		$ 1,900,000		2,300,000
Equipment Facility | Mount Milligan Mine
Debt Instrument [Line Items]
Total lease obligations		$ 22,400,000		$ 22,400,000		$ 20,300,000
Maximum underwriting available under facility							$ 132,000,000
Caterpillar
Debt Instrument [Line Items]
Sale leaseback transaction, percentage of lease assumed	25.00%
Caterpillar | Endako Mine
Debt Instrument [Line Items]
Sale leaseback transaction, fair value of leased equipment	$ 300,000
Caterpillar | Mount Milligan Mine
Debt Instrument [Line Items]
Sale leaseback transaction, percentage of lease assumed	25.00%
Additional sale-leaseback obligation	$ 500,000

Leases (Interest and Debt Issua

Leases (Interest and Debt Issuance Costs) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Interest paid	$ 15.4	$ 17.1	$ 57.6	$ 60.8
Interest and debt issuance costs expensed	20.3	21.3	62.9	65.5
Equipment loans
Debt Instrument [Line Items]
Interest paid	0.9	1.1	2.8	3.6
Interest and debt issuance costs expensed	$ 1	$ 1.2	$ 3.3	$ 3.9

Debt (Details)

Debt (Details)	Dec. 08, 2010USD ($)unit	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)	Nov. 27, 2012	May. 11, 2012	May. 20, 2011
Debt Instrument [Line Items]
Total debt		$ 832,200,000				$ 832,200,000		$ 876,200,000
Less: Current portion		(700,000)				(700,000)		(3,900,000)
Total long-term debt		831,500,000				831,500,000		872,300,000
Interest paid		15,400,000			$ 17,100,000	57,600,000	$ 60,800,000
Interest capitalized		500,000			1,400,000	1,100,000	3,300,000
Interest expensed		20,300,000			21,300,000	62,900,000	65,500,000
Gains (losses) on debt extinguishment		0			0	(400,000)	100,000
9.75% Senior Secured Notes
Debt Instrument [Line Items]
Total debt		$ 314,400,000				$ 314,400,000		$ 347,900,000
Interest rate stated percentage		9.75%				9.75%		9.75%	9.75%
Debt discount		$ 1,400,000				$ 1,400,000		$ 2,100,000
Debt repurchase			$ 34,185,000
Gains (losses) on debt extinguishment			(3,100,000)
Write off of deferred debt issuance cost			$ (500,000)
7.375% Senior Unsecured Notes
Debt Instrument [Line Items]
Total debt		$ 334,100,000				$ 334,100,000		$ 335,800,000
Interest rate stated percentage		7.375%				7.375%		7.375%			7.375%
Debt repurchase				$ 1,800,000
Gains (losses) on debt extinguishment				300,000
12.5% Senior Unsecured Notes
Debt Instrument [Line Items]
Total debt		$ 183,000,000				$ 183,000,000		$ 188,500,000
Interest rate stated percentage		12.50%				12.50%		12.50%		12.50%
Debt repurchase				5,500,000
Write off of deferred debt issuance cost				$ (100,000)
tMEDS
Debt Instrument [Line Items]
Total debt		$ 0				$ 0		$ 1,200,000
Equipment loans
Debt Instrument [Line Items]
Total debt		700,000				700,000		$ 2,800,000
Interest paid		900,000			1,100,000	2,800,000	3,600,000
Interest expensed		$ 1,000,000			$ 1,200,000	$ 3,300,000	$ 3,900,000
Mobile mining equipment loans
Debt Instrument [Line Items]
Interest rate stated percentage		3.60%				3.60%
Principal amount	$ 12,800,000
Number of units of mobile mining equipment purchased | unit	6
Outstanding payable amount		$ 700,000				$ 700,000

Gold Stream Arrangement (Detail

Gold Stream Arrangement (Details) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
		Aug. 31, 2012USD ($)$ / ozt	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Arrangement disclosures
Gold Stream deferred revenue			$ 695		$ 695		$ 721.1
Gold sales			69.5	$ 55	161.8	$ 133.5
Revenues			141.7	229.3	398.8	638.7
Gold Stream Amended and Restated Agreements
Arrangement disclosures
Gold sales	[1]		13.1	10.8	29.5	24.9
Revenues	[1]		30.1	23.8	67.9	55.1
Gold Stream Amended and Restated Agreements | Up-front Payment Arrangement
Arrangement disclosures
Gold sales			17	13	38.4	30.2
Gold Stream Amended and Restated Agreements | Gold sales
Arrangement disclosures
Deferred revenue recognized			5.1	5.9	5.6	10.4
Gold Stream Amended and Restated Agreements | Gold sales | Up-front Payment Arrangement
Arrangement disclosures
Deferred revenue recognized			8	$ 4.9	23.9	$ 14.5
Gold Stream Amended and Restated Agreements | Mount Milligan Mine
Arrangement disclosures
Percentage of payable gold to be sold per arrangement (as a percent)		52.25%
Aggregate cash deposits to be received		$ 781.5
Specified purchase price per ounce (in dollars per ounce) | $ / ozt		435
Gold Stream deferred revenue			$ 680.2		$ 680.2
[1]	$8.0 million and $4.9 million, respectively, of revenue for gold ounces delivered, and $5.1 million and $5.9 million, respectively, in revenue ultimately to be recognized upon delivery of gold. The nine months ended September 30, 2015 and 2014 included $23.9 million and $14.5 million, respectively, of revenue for gold ounces delivered, and $5.6 million and $10.4 million, respectively, in deferred revenue ultimately to be recognized upon delivery of gold.

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Other Liabilities [Abstract]
Liabilities for unrecognized tax benefits	$ 15.9	$ 0
Other accrued taxes	0	0.4
Employee benefits	4.9	4.8
Other liabilities	$ 20.8	$ 5.2

Tangible Equity Units ("tMEDS57

Tangible Equity Units ("tMEDS") (Details) - USD ($)	May. 15, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	May. 11, 2012
Tangible Equity Units (tMEDS)
tMEDS exchanged (in shares)		7,206,862
tMEDS exchanged, percentage		86.40%
Settlement rate (in shares)	5.3879
Interest paid			$ 15,400,000	$ 17,100,000	$ 57,600,000	$ 60,800,000
Interest expensed			21,300,000	22,500,000	66,200,000	69,400,000
Tangible Equity Units
Tangible Equity Units (tMEDS)
Units issued							8,800,000
Unit price (in dollars per share)							$ 25
Settlement of tangible equity units (in shares)	6,105,210	42,129,829
Interest paid			$ 0	100,000	$ 100,000	1,300,000
Interest expensed				$ 100,000		$ 1,200,000

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) $ / shares in Units, shares in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)metric$ / sharesshares	Sep. 30, 2014USD ($)
Share-based compensation disclosures
Stock-based compensation expense | $		$ 1,700,000	$ 1,900,000	$ 4,800,000	$ 4,500,000
Options not vested and not exercisable (in shares)		600		600
Total compensation cost related to these non-vested awards not yet recognized (in dollars) | $		$ 300,000		$ 300,000
Weighted average period over which compensation cost related to non-vested awards is expected to be recognized (in years)				2 years 18 days
Number of awards vested and exercisable (in shares)		600		600
Aggregate intrinsic value of exercisable awards | $		$ 0		$ 0
Stock Options
Share-based compensation disclosures
Vesting period				3 years
Expiration period				5 years
Period for measurement of exercise price				5 days
Stock-based compensation expense | $		$ 0	100,000	$ 200,000	300,000
Stock options activity
Stock options outstanding at (in shares)				1,386
Granted (in shares)				65
Exercised (in shares)				0
Canceled/expired/surrendered (in shares)				(286)
Stock options outstanding at (in shares)		1,165		1,165
Weighted-Average Exercise Price
Stock options outstanding at the beginning of period (in US dollars per share) | $ / shares	[1]			$ 4.04
Granted (in US dollars per share) | $ / shares	[1]			0.53
Exercised (in US dollars per share) | $ / shares	[1]			0
Canceled/expired/surrendered (in US dollars per share) | $ / shares	[1]			6.41
Stock options outstanding at (in US dollars per share) | $ / shares	[1]	$ 3.26		$ 3.26
Stock Options | Maximum
Share-based compensation disclosures
Exercisable period				10 years
Performance Share Units
Share-based compensation disclosures
Vesting period				3 years
Stock-based compensation expense | $		$ 900,000	1,000,000	$ 2,300,000	2,300,000
Maximum number of shares that may be issued under the previous stock option plan		6,100		6,100
Expired or forfeited (in shares)		1,900		1,900
Number of performance metrics for vesting to occur | metric				2
Performance period				3 years
Total compensation cost related to these non-vested awards not yet recognized (in dollars) | $		$ 6,700,000		$ 6,700,000
Weighted average period over which compensation cost related to non-vested awards is expected to be recognized (in years)				2 years 4 days
Stock units activity
Outstanding at (in shares)				1,920
Granted (in shares)				2,805
Cancelled/expired/forfeited (in shares)				(502)
Outstanding at (in shares)		4,223		4,223
Weighted-Average Award Price
Outstanding at (in dollars per share) | $ / shares				$ 4.59
Granted (in dollars per share) | $ / shares				2.04
Cancelled/expired/forfeited (in dollars per share) | $ / shares				6.98
Outstanding at (in dollars per share) | $ / shares		$ 2.62		$ 2.62
Restricted Stock Units
Share-based compensation disclosures
Vesting period				3 years
Stock-based compensation expense | $		$ 700,000	$ 800,000	$ 2,100,000	$ 1,800,000
Maximum number of shares that may be issued under the previous stock option plan		5,200		5,200
Total compensation cost related to these non-vested awards not yet recognized (in dollars) | $		$ 3,600,000		$ 3,600,000
Weighted average period over which compensation cost related to non-vested awards is expected to be recognized (in years)				1 year 11 months 1 day
Stock units activity
Outstanding at (in shares)				1,455
Granted (in shares)				2,218
Vested and common shares issued (in shares)				(542)
Cancelled/expired/forfeited (in shares)				(225)
Outstanding at (in shares)		2,906		2,906
Weighted-Average Award Price
Outstanding at (in dollars per share) | $ / shares				$ 3.20
Granted (in dollars per share) | $ / shares				1.53
Vested and common shares issued (in dollars per share) | $ / shares				3.70
Cancelled/expired/forfeited (in dollars per share) | $ / shares				2.36
Outstanding at (in dollars per share) | $ / shares		$ 1.90		$ 1.90
[1]	The weighted-average exercise price of options outstanding is shown in US dollars as the majority of the options granted starting in 2011 have a strike price denominated in US dollars. Options with a Canadian dollar strike price have been converted to US dollars for disclosure purposes using the exchange rates on the respective date of grant.

Commitments and Contingencies (

Commitments and Contingencies (Details)	9 Months Ended
	Sep. 30, 2015$ / lblbagreementst
Commitments and Contingencies
Number of concentrate sales agreements | agreements	4
Molybdenum Purchases
Commitments and Contingencies
Purchase commitment from 2015 to 2017 (in lbs) | lb	7,800,000
Four Copper Concentrate Sales Contracts
Commitments and Contingencies
Number of dry metric tonnes agreed to sell	140,000
Number of metric tonnes agreed to sell in year two	140,000
Number of dry metric tonnes agreed to sell in year three	40,000
Number of dry metric tonnes agreed to sell in year four	40,000
Fixed-Priced Contracts | Molybdenum Sales
Commitments and Contingencies
Sale commitment during 2015 (in lbs) | lb	171,800
Sale commitment average price (in USD per lb) | $ / lb	10.55

Income and Mining Tax Expense60

Income and Mining Tax Expense (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating Loss Carryforwards [Line Items]
Income and mining tax (benefit) expense	$ 17	$ 4.8	$ 28.6	$ 5.3
Deferred income tax expense (benefit)	(16.5)	(11.3)	(26.6)	(20.6)
Tax benefit due to successful appeal				1.4
Tax benefit related to higher taxable income		0.5		2.9
Refund	19	5.3	19	$ 5.3
Unrecognized tax benefits, amount classified as other liabilities	$ 15.9		$ 15.9
Mount Milligan Mine
Operating Loss Carryforwards [Line Items]
Deferred income tax expense (benefit)		$ 7.4

Net Income (Loss) per Share (De

Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of Net (Loss) Income and Weighted-Average Common Shares Outstanding:
Net (loss) income	$ (60.9)	$ (11.1)	$ (147.8)	$ 11.4
Basic weighted-average number of shares outstanding (in shares)	221.2	213.9	217.9	186.8
Effect of dilutive securities
Share based awards (in shares)	0	0	0	0.2
tMEDS (in shares)	0	0	0	33.1
Diluted weighted-average number of shares outstanding (in shares)	221.2	213.9	217.9	220.1
Net (loss) income per share
Basic (in USD per share)	$ (0.28)	$ (0.05)	$ (0.68)	$ 0.06
Diluted (in USD per share)	$ (0.28)	$ (0.05)	$ (0.68)	$ 0.05
Restricted Stock Units
Net (loss) income per share
Shares excluded from calculation of diluted earnings per share (in shares)	2.9	1.7	2.9
Performance Shares
Net (loss) income per share
Shares excluded from calculation of diluted earnings per share (in shares)	4.2	2.3		2.3
Stock Options
Net (loss) income per share
Shares excluded from calculation of diluted earnings per share (in shares)	1.2	2.4	1.2	2.6
tMEDS
Net (loss) income per share
Assumed issuance of diluted weighted-average shares	6.1		33.1

Transactions with our Endako 62

Transactions with our Endako Mine Joint Venture Partner (Details) - USD ($) $ in Millions	Sep. 04, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Related party transactions
Accounts receivable		$ 0.7		$ 0.7		$ 4.1
Sale leaseback transaction, percentage of lease assumed	25.00%
Endako Mine
Related party transactions
Sales to related party		$ 4.4	$ 33.5	$ 11.9	$ 87.8
Percentage of sales to related party out of total revenue (as a percent)		3.10%	14.60%	3.00%	13.70%
Management fee income			$ 0.1		$ 0.3
Selling and marketing expenses			$ 0.2		$ 0.6
Accounts receivable		$ 0.7		$ 0.7		$ 4.1
Endako Mine
Related party transactions
Sale leaseback transaction, fair value of leased equipment	$ 0.3
Caterpillar
Related party transactions
Sale leaseback transaction, percentage of lease assumed	25.00%
Caterpillar | Endako Mine
Related party transactions
Sale leaseback transaction, fair value of leased equipment	$ 0.3
Caterpillar | Mount Milligan Mine
Related party transactions
Sale leaseback transaction, percentage of lease assumed	25.00%
Additional sale-leaseback obligation	$ 0.5

Supplementary Cash Flow Infor63

Supplementary Cash Flow Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Change in current assets and current liabilities:
Accounts receivable		$ (19.7)	$ 19.7	$ (5.2)	$ (15.1)
Product inventory		17.8	(11.5)	27.9	2.1
Materials and supplies inventory		(0.4)	(1.1)	(0.4)	(0.4)
Prepaid expenses and other current assets		(0.4)	5.7	(0.2)	9.3
Income and mining taxes receivable		3	2.5	(0.9)	3.1
Accounts payable and accrued liabilities		(2.6)	0.4	(20.2)	1.8
Income and mining taxes payable		(1.2)	(1.3)	(1.8)	0.8
Change in working capital accounts, total		(3.5)	14.4	(0.8)	1.6
Cash interest paid	[1]	16.3	18.2	60.4	64.4
Income and mining taxes paid, net of refunds	[2]	(18)	5.4	(12.7)	10.9
Cash interest paid		0.2	1.3	1.2	8.2
Refund offset by a tax payment		19	5.3	19	5.3
Unrecognized tax benefits, amount classified as other liabilities		15.9
Investing activities
Acquisition of property, plant and equipment under the Equipment Facility (see Note 7)		0	0	9.2	0
Sale leaseback		0.8	0	0.8	0
Financing activities
Capitalized debt costs	[3]	0.5	0	1.1	0
Long-term lease obligations		(0.5)	0	(8.8)	0
Settlement of tMEDS		$ 0	$ 0	$ (7.2)	$ (9.3)
[1]	For the three and nine months ended September 30, 2015, cash interest paid of $0.2 million and $1.2 million, respectively, had been previously capitalized related to TCM's debt, as described in Note 8. For the three and nine months ended September 30, 2014, cash interest paid of $1.3 million and $8.2 million, respectively, had been previously capitalized related to TCM's debt.
[2]	For the three and nine months ended September 30, 2015, TCM received $19.0 million in refunds of US and Canadian income taxes related to prior year tax returns, of which $15.9 million has been accounted for as a net liability for unrecognized tax benefits due to an uncertain tax position primarily related to timing differences for certain deductions. For the three and nine months ended September 30, 2014, TCM received $5.3 million in refunds of US and Canadian income taxes related to prior year tax returns.
[3]	Included capitalized interest not paid in cash, amortization of deferred financing costs and debt discounts.

Concentration of Credit Risk (D

Concentration of Credit Risk (Details) - Accounts receivable	9 Months Ended
	Sep. 30, 2015USD ($)customer
Customer group one
Concentration of credit risk
Concentration risk receivable, minimum	$ 3,000,000
Concentration risk (as a percent)	84.30%
Customer group two
Concentration of credit risk
Number of customers considered for concentration risk | customer	4
Concentration risk receivable, minimum	$ 1,000,000
Concentration risk receivable, maximum for range	$ 3,000,000

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)segment	Sep. 30, 2014USD ($)	Dec. 31, 2014
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Percentage of ownership interest in project					75.00%
Revenues
Copper sales	$ 43.5	$ 45.7	$ 125	$ 140.3
Gold sales	69.5	55	161.8	133.5
Molybdenum sales	23	124.3	86.7	353.5
Tolling, calcining and other	5.7	4.3	25.3	11.4
Total revenues	141.7	229.3	398.8	638.7
Cost and expenses
Operating expenses	88.5	133.4	246.8	395.2
Depreciation, depletion and amortization	30.9	22.7	77.7	78.3
Total cost of sales	119.4	156.1	324.5	473.5
Selling and marketing	3.1	3.1	8.3	10.8
Accretion expense	0.6	0.9	1.8	2.7
Costs for idle mining operations	3.5	0	21.2	0
Total costs and expenses	131.2	165.5	371	504.5
OPERATING INCOME	10.5	63.8	27.8	134.2
Loss on foreign exchange	68.8	60.3	140.1	64.5
Endako Mine
Segment Reporting Information
Severance cost			6.7
Copper-Gold
Revenues
Copper sales		45.7	125	140.3
Gold sales		55	161.8	133.5
Molybdenum sales		0	0	0
Tolling, calcining and other		0	0	0
Total revenues		100.7	286.8	273.8
Cost and expenses
Operating expenses		47.4	141.5	159.9
Depreciation, depletion and amortization		15.5	65.2	48.6
Total cost of sales		62.9	206.7	208.5
Selling and marketing		1.1	6.3	4.6
Accretion expense		0.1	0.2	0.3
Costs for idle mining operations			0
Total costs and expenses		64.1	213.2	213.4
OPERATING INCOME		36.6	73.6	60.4
Loss on foreign exchange		8.8	28.5	10.1
Segment income (loss) before income and mining taxes		27.8	45.1	50.3
US Molybdenum
Revenues
Copper sales		0	0	0
Gold sales		0	0	0
Molybdenum sales		87.9	76.9	264.2
Tolling, calcining and other		6	25.7	15.8
Total revenues		93.9	102.6	280
Cost and expenses
Operating expenses		56.2	99.5	163.5
Depreciation, depletion and amortization		4.2	11.5	16.4
Total cost of sales		60.4	111	179.9
Selling and marketing		1.5	1.7	4.8
Accretion expense		0.4	0.5	1.1
Costs for idle mining operations			6
Total costs and expenses		62.3	119.2	185.8
OPERATING INCOME		31.6	(16.6)	94.2
Loss on foreign exchange		0	0	0
Segment income (loss) before income and mining taxes		31.6	(16.6)	94.2
Canadian Molybdenum
Revenues
Copper sales		0	0	0
Gold sales		0	0	0
Molybdenum sales		36.5	9.8	94.1
Tolling, calcining and other		0	0	0
Total revenues		36.5	9.8	94.1
Cost and expenses
Operating expenses		31.7	6.2	81
Depreciation, depletion and amortization		3	0.5	12.7
Total cost of sales		34.7	6.7	93.7
Selling and marketing		1	0.3	2.7
Accretion expense		0.4	1.1	1.3
Costs for idle mining operations			15.2
Total costs and expenses		36.1	23.3	97.7
OPERATING INCOME		0.4	(13.5)	(3.6)
Loss on foreign exchange		(1.4)	(2.6)	(1.2)
Segment income (loss) before income and mining taxes		1.8	(10.9)	(2.4)
Total Excluding Corporate
Revenues
Copper sales	43.5	45.7	125	140.3
Gold sales	69.5	55	161.8	133.5
Molybdenum sales	23	124.3	86.7	353.5
Tolling, calcining and other	5.7	4.3	25.3	11.4
Total revenues	141.7	229.3	398.8	638.7
Cost and expenses
Operating expenses	88.5	133.4	246.8	395.2
Depreciation, depletion and amortization	30.5	22.7	77.2	77.7
Total cost of sales	119	156.1	324	472.9
Selling and marketing	3.1	3.1	8.3	10.8
Accretion expense	0.6	0.9	1.8	2.7
Costs for idle mining operations	3.5		21.2
Total costs and expenses	126.2	160.1	355.3	486.4
OPERATING INCOME	15.5	69.2	43.5	152.3
Loss on foreign exchange	14.4	7.4	25.9	8.9
Segment income (loss) before income and mining taxes	1.1	61.8	17.6	143.4
Intersegment Eliminations [Member]
Revenues
Copper sales	0	0	0	0
Gold sales	0	0	0	0
Molybdenum sales	0	(0.1)	0	(4.8)
Tolling, calcining and other	(0.1)	(1.7)	(0.4)	(4.4)
Total revenues	(0.1)	(1.8)	(0.4)	(9.2)
Cost and expenses
Operating expenses	(0.1)	(1.9)	(0.4)	(9.2)
Depreciation, depletion and amortization	(0.2)	0	0	0
Total cost of sales	(0.3)	(1.9)	(0.4)	(9.2)
Selling and marketing	0	(0.5)	0	(1.3)
Accretion expense	0	0	0	0
Costs for idle mining operations	0		0
Total costs and expenses	(0.3)	(2.4)	(0.4)	(10.5)
OPERATING INCOME	0.2	0.6	0	1.3
Loss on foreign exchange	0	0	0	0
Segment income (loss) before income and mining taxes	0.2	$ 0.6	$ 0	$ 1.3
Operating Segments [Member] | Copper-Gold
Revenues
Copper sales	43.5
Gold sales	69.5
Molybdenum sales	0
Tolling, calcining and other	0
Total revenues	113
Cost and expenses
Operating expenses	58.1
Depreciation, depletion and amortization	28.1
Total cost of sales	86.2
Selling and marketing	2.5
Accretion expense	0
Costs for idle mining operations	0
Total costs and expenses	88.7
OPERATING INCOME	24.3
Loss on foreign exchange	15.5
Segment income (loss) before income and mining taxes	8.8
Operating Segments [Member] | US Molybdenum
Revenues
Copper sales	0
Gold sales	0
Molybdenum sales	18.6
Tolling, calcining and other	5.8
Total revenues	24.4
Cost and expenses
Operating expenses	27.9
Depreciation, depletion and amortization	2.5
Total cost of sales	30.4
Selling and marketing	0.5
Accretion expense	0.2
Costs for idle mining operations	1.8
Total costs and expenses	32.9
OPERATING INCOME	(8.5)
Loss on foreign exchange	0
Segment income (loss) before income and mining taxes	(8.5)
Operating Segments [Member] | Canadian Molybdenum
Revenues
Copper sales	0
Gold sales	0
Molybdenum sales	4.4
Tolling, calcining and other	0
Total revenues	4.4
Cost and expenses
Operating expenses	2.6
Depreciation, depletion and amortization	0.1
Total cost of sales	2.7
Selling and marketing	0.1
Accretion expense	0.4
Costs for idle mining operations	1.7
Total costs and expenses	4.9
OPERATING INCOME	(0.5)
Loss on foreign exchange	(1.1)
Segment income (loss) before income and mining taxes	$ 0.6

Segment Information (Reconcilia

Segment Information (Reconciliation of Segment Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other expense (income)
General and administrative	$ 4.6	$ 5.1	$ 15.1	$ 16.9
Interest expense, net	21.3	22.5	66.2	69.4
Loss on foreign exchange	68.8	60.3	140.1	64.5
Loss from debt extinguishment	0	0	2.8	0.5
Other	(1.7)	(3.1)	(4.8)	(6.1)
(Loss) income before income and mining taxes	(77.9)	(15.9)	(176.4)	6.1
Income and mining tax benefit	(17)	(4.8)	(28.6)	(5.3)
NET (LOSS) INCOME	(60.9)	(11.1)	(147.8)	11.4
Segment Reconciling Items
Reconciliation of segment income to net income
Segment income	1.1	61.8	17.6	143.4
Other expense (income)
General and administrative	4.6	5.1	15.1	16.9
Exploration	0	0.3	0.1	0.6
Interest expense, net	21.3	22.5	66.1	69.2
Loss on foreign exchange	54.4	52.9	114.2	55.6
Corporate depreciation	0.4	0	0.5	0.6
Loss from debt extinguishment	0	0	2.8	0.5
Other	(1.7)	(3.1)	(4.8)	(6.1)
(Loss) income before income and mining taxes	(77.9)	(15.9)	(176.4)	6.1
Income and mining tax benefit	(17)	(4.8)	(28.6)	(5.3)
NET (LOSS) INCOME	$ (60.9)	$ (11.1)	$ (147.8)	$ 11.4

Segment Information (Other Segm

Segment Information (Other Segment Information) (Details) - USD ($)		3 Months Ended		9 Months Ended			12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				$ 0	[1]		$ 82,100,000	[2]
One-time settlement of construction claims				13,000,000
Property, plant, equipment and development	[3]			1,923,100,000			2,218,300,000
Assets		$ 2,448,600,000		2,448,600,000			2,846,300,000
Liabilities		1,854,500,000		1,854,500,000			1,958,800,000
Capital expenditures paid		24,900,000	$ 21,900,000	47,800,000		$ 70,400,000	21,000,000
Copper-Gold
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				43.7			77,000,000	[2]
Property, plant, equipment and development	[3]			1,786,400,000			2,075,300,000
Assets		2,004,000,000		2,004,000,000			2,304,100,000
Liabilities		879,300,000		879,300,000			912,000,000
Secondary Crusher
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				4,200,000
Permanent Operations Residence
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				1,900,000			29,800,000
US Molybdenum
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				3.9			4,000,000	[2]
Property, plant, equipment and development	[3]			112,500,000			114,400,000
Assets		334,400,000		334,400,000			444,300,000
Liabilities		31,400,000		31,400,000			33,800,000
Canadian Molybdenum
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				0.2			1,100,000	[2]
Property, plant, equipment and development	[3]			23,800,000			27,500,000
Assets		49,100,000		49,100,000			77,600,000
Liabilities		18,300,000		18,300,000			30,500,000
Inter-segment
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				0	[1]		0	[2]
Property, plant, equipment and development	[3]			400,000			1,100,000
Assets		61,100,000		61,100,000			20,300,000
Liabilities		$ 925,500,000		925,500,000			982,500,000
Mount Milligan Mine
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures				$ 24,600,000			30,900,000
Project Capital
Other segment information regarding capital expenditures, assets and liabilities
Capital expenditures							$ 16,300,000
[1]	Capital expenditures were for the nine months ended September 30, 2015. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $4.2 million for engineering and site-preparation expenditures relating to the permanent secondary crusher, $24.6 million for operating capital, $13.0 million for the one-time settlement of certain construction claims in July 2015 and $1.9 million for the payment of accruals related to the permanent operations residence.
[2]	Capital expenditures were for the year ended December 31, 2014. Copper-Gold capital expenditures are for the Mount Milligan Mine and include $29.8 million for the permanent operations residence, $30.9 million for operating capital and $16.3 million for project capital (related to the payment of accruals from December 31, 2013). Total cash capital expenditures during 2014 included $21.0 million in payments of amounts accrued at December 31, 2013
[3]	Includes exploration properties.