Hudbay Minerals (HBM) 40-F 30 Mar 18 2017 FY Annual report (Canada) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017shares
Statement [Line Items]
Document Type	40-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Trading Symbol	hbm
Entity Registrant Name	Hudbay Minerals Inc.
Entity Central Index Key	1,322,422
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	261,271,188
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 356,499	$ 146,864
Trade and other receivables	155,522	152,567
Inventories	141,682	112,464
Prepaid expenses	8,995	3,992
Other financial assets	2,841	3,397
Taxes receivable	3	17,319
Total Current assets	665,542	436,603
Receivables	32,459	32,648
Inventories	5,809	4,537
Other financial assets	22,461	30,848
Intangible assets - computer software	5,575	6,614
Property, plant and equipment	3,880,894	3,865,823
Deferred tax assets	35,989	79,483
Total Assets	4,648,729	4,456,556
Current liabilities
Trade and other payables	199,117	169,662
Taxes payable	10,794	4,419
Other liabilities	51,962	42,207
Other financial liabilities	26,760	13,495
Finance lease obligations	18,327	3,172
Long-term debt	0	16,490
Deferred revenue	49,907	65,619
Total Current liabilities	356,867	315,064
Other financial liabilities	20,801	28,343
Finance lease obligations	66,246	9,760
Long-term debt	979,575	1,215,674
Deferred revenue	448,137	472,233
Provisions	200,138	179,702
Pension obligations	22,221	28,379
Other employee benefits	108,397	89,273
Deferred tax liabilities	302,092	354,916
Total liabilities	2,504,474	2,693,344
Equity
Share capital	1,777,409	1,588,319
Reserves	(10,300)	(42,040)
Retained earnings	377,146	216,933
Total equity	2,144,255	1,763,212
Total liabilities and equity	$ 4,648,729	$ 4,456,556

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash generated from (used in) operating activities:
Loss for the year	$ 163,899	$ (35,193)
Tax expense (recovery)	34,829	40,798
Items not affecting cash:
Depreciation and amortization	293,235	299,134
Share-based payment expense (recovery)	15,919	9,887
Net finance expense	100,179	164,279
Change in fair value of derivatives	1,790	(1,238)
Change in deferred revenue related to stream	(48,958)	(65,762)
Change in taxes receivable/payable, net	(39,326)	(3,666)
Unrealized (gain) loss on warrants	(1,051)	2,111
Pension and other employee benefit payments, net of accruals	3,142	(11,120)
(Gain) loss on available-for-sale investments	1,970	(373)
Asset and goodwill impairment losses	11,320	0
Other and foreign exchange	4,230	2,625
Taxes paid	(10,617)	(13,614)
Operating cash flow before change in non-cash working capital	530,561	387,868
Change in non-cash working capital	9,015	87,206
Net cash flows from (used in) operating activities	539,576	475,074
Cash generated from (used in) investing activities:
Acquisition of property, plant and equipment	(249,763)	(192,822)
Acquisition of investments	(2,245)	(359)
Release of (addition to) restricted cash	16,854	45,913
Net interest received (paid)	890	212
Net cash flows from (used in) investing activities	(234,264)	(147,056)
Cash generated from (used in) financing activities:
Long-term debt borrowing, net of transaction costs paid	25,000	62,247
Principal repayments	(281,439)	(176,490)
Net refinancing of senior unsecured notes	0	21,194
Interest paid	(52,743)	(126,520)
Financing costs	(26,597)	(21,763)
Payment of finance lease	(7,509)	(2,897)
Sale leaseback	67,275	0
Net proceeds from issuance of equity	186,852	11,719
Dividends paid	(3,686)	(3,567)
Net cash flows from (used in) financing activities	(92,847)	(236,077)
Effect of movement in exchange rates on cash and cash equivalents	(2,830)	1,071
Net increase (decrease) in cash and cash equivalents	209,635	93,012
Cash and cash equivalents, beginning of year	146,864	53,852
Cash and cash equivalents, end of year	$ 356,499	$ 146,864

Consolidated Income Statements

Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Revenue	$ 1,362,553	$ 1,128,678
Cost of sales
Mine operating costs	695,728	607,170
Depreciation and amortization	292,880	298,630
Cost of Sales	988,608	905,800
Gross Profit	373,945	222,878
Selling and administrative expenses	42,283	37,774
Exploration and evaluation expenses	15,474	4,742
Other operating expenses	(12,440)	10,586
Asset and goodwill impairment loss	11,320	0
Results from operating activities	317,308	169,776
Finance income	(2,849)	(2,792)
Finance expenses	103,028	167,071
Other finance gain	18,401	(108)
Net finance expense	118,580	164,171
Profit (loss) before tax	198,728	5,605
Tax expense (recovery)	34,829	40,798
Loss for the year	$ 163,899	$ (35,193)
Loss per share - basic and diluted	$ 0.67	$ (0.15)
Weighted average number of common shares outstanding:
Diluted	243,500,696	235,807,509

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Loss for the year	$ 163,899	$ (35,193)
Items that may be reclassified subsequently to profit or loss
Net exchange gain (loss) on translation of foreign operations	20,866	8,301
Change in fair value of available-for-sale financial investments	2,507	3,598
Effect of foreign exchange on available-for-sale financial investments	922	53
Other comprehensive income that will be reclassified to profit or loss, net of tax	24,295	11,952
Items that will not be reclassified subsequently to profit or loss:
Remeasurement - actuarial (loss) gain	6,299	(11,252)
Tax effect	(3,845)	2,198
Other comprehensive income that will not be reclassified to profit or loss, net of tax	2,454	(9,054)
Wind up of subsidiaries	3,021	0
Impairment of available-for-sale investments	2,059	1,102
Sale of available-for-sale investments	(89)	(1,037)
Components of other comprehensive income transferred to income statements	4,991	65
Other comprehensive income (loss), net of tax, for the year	31,740	2,963
Total comprehensive loss for the year	$ 195,639	$ (32,230)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Share capital [Member]	Other capital reserves [Member]	Foreign currency translation reserve [Member]	Available-for-sale reserve [Member]	Remeasurement reserve [Member]	Retained earnings [Member]
Beginning Balance at Dec. 31, 2015	$ 1,787,290	$ 1,576,600	$ 28,837	$ (13,897)	$ 1,309	$ (61,252)	$ 255,693
Statement [Line Items]
Profit (Loss)	(35,193)						(35,193)
Other comprehensive (loss) income	2,963			8,301	3,716	(9,054)
Total comprehensive (loss) income	(32,230)			8,301	3,716	(9,054)	(35,193)
Contributions by and distributions to owners:
Stock options exercised	11,814	11,814
Equity issuance		11,814
Share issue costs, net of tax	(95)	(95)
Dividends	(3,567)						(3,567)
Total contributions by and distributions to owners	8,152	11,719					(3,567)
Ending Balance at Dec. 31, 2016	1,763,212	1,588,319	28,837	(5,596)	5,025	(70,306)	216,933
Statement [Line Items]
Profit (Loss)	163,899						163,899
Other comprehensive (loss) income	31,740			23,887	5,399	2,454
Total comprehensive (loss) income	195,639			23,887	5,399	2,454	163,899
Contributions by and distributions to owners:
Equity issuance	195,295	195,295
Share issue costs, net of tax	(6,205)	(6,205)
Dividends	(3,686)						(3,686)
Total contributions by and distributions to owners	185,404	189,090					(3,686)
Ending Balance at Dec. 31, 2017	$ 2,144,255	$ 1,777,409	$ 28,837	$ 18,291	$ 10,424	$ (67,852)	$ 377,146

Reporting entity

Reporting entity	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Reporting entity [Text Block]	1. Reporting entity On January 1, 2017, Hudbay Minerals Inc. amalgamated under the Canada Business Corporations Act Wholly owned subsidiaries as at December 31, 2017, include HudBay Marketing & Sales Inc. (“HMS”), HudBay Peru Inc., HudBay Peru S.A.C. ("Hudbay Peru"), HudBay (BVI) Inc., Hudbay Arizona Inc. and Rosemont Copper Company (“Rosemont”). Hudbay is an integrated mining company producing copper concentrate (containing copper, gold and silver), zinc concentrate and zinc metal. With assets in North and South America, the Group is focused on the discovery, production and marketing of base and precious metals. Directly and through its subsidiaries, Hudbay owns four polymetallic mines, four ore concentrators and a zinc production facility in northern Manitoba and Saskatchewan (Canada) and Cusco (Peru) and a copper project in Arizona (United States). The Group also has equity investments in a number of junior exploration companies. The Company is governed by the Canada Business Corporations Act and its shares are listed under the symbol "HBM" on the Toronto Stock Exchange, New York Stock Exchange and Bolsa de Valores de Lima. Hudbay also has warrants listed under the symbol “HBM.WT” on the Toronto Stock Exchange and “HBM/WS” on the New York Stock Exchange.

Basis of preparation

Basis of preparation	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Basis of preparation [Text Block]	2. Basis of preparation (a) Statement of compliance: These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB") effective for the year ended December 31, 2017. The Board of Directors approved these consolidated financial statements on February 21, 2018. (b) Functional and presentation currency: The Group's consolidated financial statements are presented in US dollars, which is the Company’s and all material subsidiaries' functional currency, except the Company’s Manitoba business unit, which has a functional currency of Canadian dollars. All values are rounded to the nearest thousand ($000) except where otherwise indicated. (c) Basis of measurement: The consolidated financial statements have been prepared on the historical cost basis except for the following items in the consolidated balance sheets: - Derivatives, embedded derivatives, other financial instruments at fair value through profit or loss ("FVTPL") and available-for-sale financial assets are measured at fair value; - Liabilities for cash-settled share-based payment arrangements are measured at fair value; and - A defined benefit liability is recognized as the net total of the plan assets, unrecognized past service costs and unrecognized actuarial losses, less unrecognized actuarial gains and the present value of the defined benefit obligation. (d) Use of judgements and estimates: The preparation of the consolidated financial statements in conformity with IFRS requires the Group to make judgements, estimates and assumptions that affect the application of accounting policies, reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and reported amounts of revenue and expenses during the reporting period. Actual results may differ from these estimates. The Group reviews these estimates and underlying assumptions on an ongoing basis, based on experience and other factors, including expectations of future events that the Group believe to be reasonable under the circumstances. Revisions to accounting estimates are recognized prospectively in the period in which the estimates are revised and in any future periods affected. The following are significant judgements and estimates impacting the consolidated financial statements: - Mineral reserves and resources Changes in the mineral reserve or resource estimates may affect: - the carrying value of exploration and evaluation assets, capital works in progress, mining properties and plant and equipment; - depreciation expense for assets depreciated either on a unit-of-production basis or on a straight line basis where useful lives are restricted by the life of the related mine or plan; - the provision for decommissioning, restoration and similar liabilities; and - the carrying value of deferred tax assets. - Property plant and equipment For depreciable property, plant and equipment assets, management makes estimates to determine depreciation. For assets depreciated using the straight line method, residual value and useful lives of the assets or components are estimated. A significant estimate is required to determine the total production basis for units-of-production depreciation. The most currently available reserve and resource report is utilized in determining the basis which has material impacts on the amount of depreciation recorded through inventories and the consolidated income statements. There are numerous uncertainties inherent in estimating mineral reserves, and assumptions that were valid at the reporting date may change when new information becomes available. The actual volume of ore extracted and any changes in these assumptions could affect prospective depreciation rates and carrying values. In determining whether stripping costs incurred during the production phase of a mining property relate to mineral reserves and mineral resources that will be mined in a future period and therefore should be capitalized, the Group makes estimates of the proportion of stripping activity which relates to extracting current ore and the proportion which relates to obtaining access to ore reserves which will be mined in the future. - Impairment of non-financial assets - Tax provisions - Timing of commercial production - Functional currency - Assaying utilized to determine revenue and recoverability of inventories - Decommissioning and restoration obligations - Accounting for stream transactions - Pensions and other employee benefits

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Significant accounting policies [Text Block]	3. Significant accounting policies The accounting policies set out below have been applied consistently to all periods presented in these consolidated financial statements and by all Group entities. (a) Basis of consolidation: Intercompany balances and transactions are eliminated upon consolidation. When a Group entity transacts with an associate or jointly controlled entity of the Group, unrealized profits and losses are eliminated to the extent of the Group’s interest in the relevant associate or joint venture. The accounting policies of Group entities are changed when necessary to align them with the policies adopted by the Company. Subsidiaries A subsidiary is an entity controlled by the Group. The financial statements of subsidiaries are included in the consolidated financial statements from the date that control commences until the date that control ceases. Business combinations and goodwill When the Group makes an acquisition, it first determines whether the assets acquired and liabilities assumed constitute a business, in which case the acquisition requires accounting as a business combination. Management applies judgement in determining whether the acquiree is capable of being conducted and managed for the purpose of providing a return, considering the inputs of the acquiree and processes applied to those inputs that have the ability to create outputs. The Group applies the acquisition method of accounting to business combinations, whereby the goodwill is measured at the acquisition date as the fair value of the consideration transferred including the recognized amount of any non-controlling interests in the acquiree. When the excess is negative, a bargain purchase gain is recognized immediately in the consolidated income statements. The assessment of fair values on acquisition includes those mineral reserves and resources that are able to be reliably measured. In determining these fair values, management must also apply judgement in areas including future cash flows, metal prices, exchange rates and appropriate discount rates. Changes in such estimates and assumptions could result in significant differences in the amount of goodwill recognized. The consideration transferred is the aggregate of the fair values at the date of acquisition of the sum of the assets transferred, the liabilities incurred or assumed, and the equity instruments issued by the acquirer in exchange for control of the acquiree. Acquisition-related costs are recognized in the consolidated income statements as incurred, unless they relate to issue of debt or equity securities. Where applicable, the consideration transferred includes any asset or liability resulting from a contingent consideration arrangement and measured at its acquisition date fair value. Subsequent changes in such fair values are adjusted against the cost of acquisition where they qualify as measurement period adjustments. All other subsequent changes in the fair value of contingent consideration classified as an asset or liability are accounted for in accordance with relevant IFRS. Changes in the fair value of contingent consideration classified as equity are not recognized. Where a business combination is achieved in stages, the Group's previously held interests in the acquired entity are remeasured to fair value at the acquisition date, which is the date the Group attains control, and any resulting gain or loss is recognized in the consolidated income statements. Amounts previously recognized in other comprehensive income (“OCI”) related to interests in the acquiree prior to the acquisition date are reclassified to the consolidated income statements, where such treatment would be appropriate if that interest were disposed of. After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each of the Group’s CGUs that are expected to benefit from the synergies of the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Goodwill is allocated to the lowest level at which it is monitored for internal management purposes and is not larger than an operating segment before aggregation. Where goodwill forms part of a CGU and part of the operation within that unit is disposed of, the goodwill associated with the disposed operation is included in the determination of any gain or loss on disposal. Goodwill is not amortized and is tested for impairment annually and whenever there is an indication of impairment. If any such indication exists, the recoverable amount of the CGU is estimated in order to determine the extent of the impairment, if any. The recoverable amount is determined as the higher of fair value less direct costs to sell and the CGU’s value in use. An impairment loss in respect of goodwill is not reversed. Fair value for mineral interests and related goodwill is generally determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account. Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset in its present form and its eventual disposal. Value in use is determined by applying assumptions specific to the Group’s continued use and cannot take into account future development. The weighted average cost of capital of the Group or comparable market participants is used as a starting point for determining the discount rates, with appropriate adjustments for the risk profile of the countries in which the individual CGUs operate and the specific risks related to the development of the project. Where the asset does not generate cash flows that are independent of other assets, the Group estimates the recoverable amount of the CGU to which the asset belongs. If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount of the asset or CGU is reduced to its recoverable amount. An impairment loss is recognized as an expense in the consolidated income statements. (b) Translation of foreign currencies: Management determines the functional currency of each Group entity as the currency of the primary economic environment in which the entity operates. Foreign currency transactions Transactions in foreign currencies are translated to the respective functional currencies of Group entities at exchange rates in effect at the transaction dates. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency using the noon exchange rate. Non-monetary assets and liabilities measured at fair value are translated using the exchange rates at the date when fair value was determined. Non-monetary assets and liabilities measured at historical cost in a foreign currency are translated using exchange rates that were in effect at the transaction dates. The same translations are applied when an entity prepares its financial statements from books and records maintained in a currency other than its functional currency, except revenue and expenses may be translated at monthly average exchange rates that approximate those in effect at the transaction dates. Foreign currency gains and losses arising on period-end revaluations are recognized in the consolidated income statements, except for differences arising on translation of available-for-sale equity instruments, a financial liability designated as a hedge of a net investment in a foreign operation, or qualifying cash flow hedges, which are recognized in OCI. Foreign operations For the purpose of the consolidated financial statements, assets and liabilities of Group entities that have functional currencies other than the US dollar are translated to US dollars at the reporting date using the noon exchange rate. Revenue and expenses are translated at monthly average exchange rates that approximate those in effect at the transaction dates. Differences arising from these foreign currency translations are recognized in OCI and presented within equity in the foreign currency translation reserve. When a foreign operation is disposed, the relevant exchange differences accumulated in the foreign currency translation reserve are transferred to the consolidated income statements as part of the profit or loss on disposal. On the partial disposal of a subsidiary that includes a foreign operation, the relevant proportion of such amount is reattributed to non-controlling interests. On disposal of a partial investment in an associate or joint venture that includes a foreign operation while retaining significant influence or joint control, the relevant proportion is reclassified to profit or loss. Net investment in a foreign operation Foreign currency gains and losses arising on translation of a monetary item receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur in the foreseeable future are considered to form part of a net investment in the foreign operation. Such gains and losses are recognized in OCI and presented within equity in the foreign currency translation reserve. (c) Revenue recognition: Revenue from the sale of goods is measured at the fair value of the consideration received or receivable, net of treatment and refining charges and pre-production revenue. Sales revenue is recognized when the significant risks and rewards of ownership have been transferred to the buyer, the Group has insignificant continuing management involvement with the goods, the amount of revenue can be measured reliably, recovery of the consideration is probable and the associated costs and possible return of goods can be estimated reliably. Transfers of risks and rewards vary depending on individual contract terms and frequently occur at the time when title passes to the customer. For medium and long-term contracts, revenue recognition criteria are assessed for individual sales within the contracts. Revenue from the sale of by-products is included within revenue. Sales of concentrate and certain other products are “provisionally priced”. For these contracts, sales prices are subject to final adjustment at the end of a future period after shipment, based on quoted market prices during the quotational period specified in the contract. Revenue is recognized when the above criteria are met, using weight and assay results and forward market prices to estimate the fair value of the total consideration receivable. Such a provisional sale contains an embedded derivative that must be separated from the host contract. At each reporting date, provisionally priced metals sales are marked to market, with adjustments (both gains and losses) recorded in revenue in the consolidated income statements and in trade and other receivables on the consolidated balance sheets. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. Interest revenue is recognized in finance income as it accrues, using the effective interest method. Dividend revenue from investments is recognized when the shareholder’s right to receive payment has been established provided that it is probable that the economic benefits will flow to the Group and the amount of revenue can be measured reliably. (d) Cost of sales: Cost of sales consists of those costs previously included in the measurement of inventory sold during the period, as well as certain costs not included in the measurement of inventory, such as the cost of warehousing and distribution to customers, provisional pricing adjustments related to purchased concentrates, profit sharing, royalty payments, share-based payments and other indirect expenses related to producing operations. (e) Cash and cash equivalents: Cash and cash equivalents include cash, demand deposits and short-term, highly liquid investments that are readily convertible to known amounts of cash and are subject to an insignificant risk of changes in value. Cash equivalents have maturities of three months or less at the date of acquisition. Interest earned is included in finance income on the consolidated income statements and in investing activities on the consolidated statements of cash flows. Amounts that are restricted from being used for at least twelve months after the reporting date are classified as non-current assets and presented in restricted cash on the consolidated balance sheets. Changes in restricted cash balances are classified as investing activities on the consolidated statements of cash flows. (f) Inventories: Inventories consist of stockpiles, in-process inventory (concentrates and metals), metal products and supplies. Concentrates, metals and all other saleable products are valued at the lower of cost and estimated net realizable value. Net realizable value represents the estimated selling price for inventories less all estimated costs of completion and costs necessary to make the sale. Where the net realizable value is less than cost, the difference is charged to the consolidated income statements as an impairment charge in cost of sales. Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized. Cost of production of concentrate inventory is determined on a weighted average cost basis and the cost of production of finished metal inventory is determined using the first in first out basis. The cost of production includes direct costs associated with conversion of production inventory: material, labour, contractor expenses, purchased concentrates, and an attributable portion of production overheads and depreciation of all property, plant and equipment involved with the mining and production process. Hudbay measures in-process inventories based on assays of material received at metallurgical plants and estimates of recoveries in the production processes. Due to significant uncertainty associated with volume and metal content, immaterial costs are not allocated to routine operating levels of stockpiled ore. Estimates and judgements are required to assess the nature of any significant changes to levels of ore stockpiles and determining whether allocation of costs is required. Supplies are valued at the lower of average cost and net realizable value. A regular review is undertaken to determine the extent of any provision for obsolescence. (g) Intangible assets: Computer software is measured at cost less accumulated amortization and accumulated impairment losses. Costs include all directly attributable costs necessary to create, produce and prepare the asset to be capable of operating it in the manner intended by management. Amortization methods, useful lives, and residual values if any, are reviewed at each year end and adjusted prospectively, if required. When an intangible asset is disposed of, or when no further economic benefits are expected, the asset is derecognized, and any resulting gain or loss is recorded in the consolidated income statements. Currently, the Group’s intangible assets relate primarily to enterprise resource planning (“ERP”) information systems, which are amortized over their estimated useful lives. (h) Exploration and evaluation expenditures: Exploration and evaluation activity begins when the Group obtains legal rights to explore a specific area and involves the search for mineral reserves, the determination of technical feasibility, and the assessment of commercial viability of an identified resource. Expenditures incurred in the exploration and evaluation phase include the cost of acquiring interests in mineral rights, licenses and properties and the costs of the Group’s exploration activities, such as researching and analyzing existing exploration data, gathering data through geological studies, exploratory drilling, trenching, sampling, and certain feasibility studies. The Group expenses the cost of its exploration and evaluation activities and capitalizes the cost of acquiring interests in mineral rights, licenses and properties in business combinations, asset acquisitions or option agreements. Amounts capitalized are recognized as exploration and evaluation assets and presented in property, plant and equipment. Exploration and evaluation assets acquired as a result of an asset acquisition or option agreement are initially recognized at cost, and those acquired in a business combination are recognized at fair value on the acquisition date. They are subsequently carried at cost less accumulated impairment. No depreciation is charged during the exploration and evaluation phase. The Group expenses the cost of subsequent exploration and evaluation activity related to acquired exploration and evaluation assets. Cash flows associated with acquiring exploration and evaluation assets are classified as investing activities in the consolidated statements of cash flows; those associated with exploration and evaluation expenses are classified as operating activities. Judgement is required in determining whether the respective costs are eligible for capitalization where applicable, and whether they are likely to be recoverable, which may be based on assumptions about future events and circumstances. Estimates and assumptions made may change if new information becomes available. The Group monitors exploration and evaluation assets for factors that may indicate their carrying amounts are not recoverable. If such indicators are identified, the Group tests the exploration and evaluation assets or their CGUs, as applicable, for impairment. The Group also tests impairment when assets reach the end of the exploration and evaluation phase. Exploration and evaluation assets are transferred to capital works in progress within property, plant and equipment once the Group determines that probable future economic benefits will be generated as a result of the expenditures. The Group’s determination of probable future economic benefit is based on management’s evaluation of the technical feasibility and commercial viability of the geological properties of a given ore body based on information obtained through evaluation activities, including metallurgical testing, resource and reserve estimates and the economic assessment of whether the ore body can be mined economically. Tools that may be used to determine this include a preliminary feasibility study, confidence in converting resources into reserves and the probability that the property could be developed into a mine site. At that time, the property is considered to enter the development phase, and subsequent evaluation costs are capitalized. (i) Property, plant and equipment: The Group measures items of property, plant and equipment at cost less accumulated depreciation and any accumulated impairment losses. The initial cost of an item of property, plant and equipment includes its purchase price or construction costs, including import duties and non-refundable purchase taxes, any costs directly attributable to bringing the asset into operation, and for qualifying assets, borrowing costs. The initial cost of property, plant and equipment also includes the initial estimate of the cost of dismantling and removing the item and restoring the site on which it is located, the obligation for which the Group incurs either when the item is acquired or as a consequence of having used the item during a particular period for purposes other than to produce inventories during that period. Capitalization of costs ceases once an asset is in the location and condition necessary for it to be capable of operating in the manner intended by management. At this time, depreciation commences. For a new mine, this occurs upon commencement of commercial production. Any revenue earned in the process of preparing an asset to be capable of operating in the manner intended by management is included in the cost of the constructed asset. Any other incidental revenue earned prior to commencement of commercial production is recognized in the consolidated income statements. Carrying amounts of property, plant and equipment, including assets under finance leases, are depreciated to their estimated residual value over the estimated useful lives of the assets or the estimated life of the related mine or plant, if shorter. Where components of an asset have different useful lives, depreciation is calculated on each separate component. Components may be physical or non-physical, including the cost of regular major inspections and overhauls required in order to continue operating an item of property, plant and equipment. Certain items of property, plant and equipment are depreciated on a unit-of-production basis. The unit-of-production method is based on proven and probable tonnes of ore reserves. There are numerous uncertainties inherent in estimating ore reserves, and assumptions that were valid at the reporting date may change when new information becomes available. The actual volume of ore extracted and any changes in these assumptions could affect prospective depreciation rates and carrying values. The carrying amount of an item of property, plant and equipment is derecognized on disposal or when no future economic benefits are expected from its use or disposal. Upon derecognition of an item of property, plant and equipment, the difference between its carrying value and net sales proceeds, if any, is presented as a gain or loss in other operating income or expense in the consolidated income statements. (i) Capital works in progress: Capital works in progress consist of items of property, plant and equipment in the course of construction or mineral properties in the course of development, including those transferred upon completion of the exploration and evaluation phase. On completion of construction or development, costs are transferred to plant and equipment and/or mining properties as appropriate. Capital works in progress are not depreciated. (ii) Mining properties: Mining properties consist of costs transferred from capital works in progress when a mining property reaches commercial production, costs of subsequent mine and exploration development, and acquired mining properties in the production stage. Mining properties include costs directly attributable to bringing a mineral asset into the state where it is capable of operating in the manner intended by management and includes such costs as the cost of shafts, ramps, track haulage drifts, ancillary drifts, pumps, electrical substations, refuge stations, ventilation raises, permanent manways, and ore and waste pass raises. The determination of development costs to be capitalized during the production stage of a mine operation requires the use of judgements and estimates such as estimates of tonnes of waste to be removed over the life of the mining area and economically recoverable reserves extracted as a result. A mining property is considered to be capable of operating in a manner intended by management when it commences commercial production. Upon commencement of commercial production, a mining property is depreciated on a unit-of-production method. Unit-of-production depreciation rates are determined based on the related proven and probable mineral reserves and associated future development costs. Subsequent mine development costs are capitalized to the extent they are incurred in order to access reserves mineable over more than one year. Ongoing maintenance and development expenditures are expensed as incurred and included in cost of sales in profit or loss. These include ore stope access drifts, footwall and hangingwall drifts in stopes, drawpoints, drill drifts, sublevels, slots, drill raises, stope manway access raises and definition diamond drilling. (iii) Plant and equipment: Plant and equipment consists of buildings and fixtures, surface and underground fixed and mobile equipment and assets under finance lease. Plant and equipment are depreciated on either unit-of-production or straight-line basis based on factors including the production life of assets and mineable reserves. In general, mining assets are depreciated using a unit-of-production method; equipment is depreciated using the straight-line method, based on the shorter of its useful life and that of the related mine or facility; and plants are depreciated using the straight-line method, with useful lives limited by those of related mining assets. (iv) Depreciation rates of major categories of assets: — Capital works in progress - not depreciated — Mining properties - unit-of-production — Mining assets - unit-of-production — Plant and Equipment — Equipment - straight-line over 1 to 21 years — Other plant assets - straight-line over 1 to 21 years / unit of production The Group reviews its depreciation methods, remaining useful lives and residual values at least annually and accounts for changes in estimates prospectively. (v) Commercial production: Commercial production is the level of activities intended by management for a mine, or a mine and mill complex, to be capable of operating in the manner intended by management. The Group considers a range of factors when determining the level of activity that represents commercial production for a particular project, including a pre-determined percentage of design capacity for the mine and mill; achievement of continuous production, ramp-ups, or other output; or specific factors such as recoveries, grades, or inventory build-ups. In a phased mining approach, management may consider achievement of specific milestones at each phase of completion. In a non-phased mining approach, management considers average actual metrics that are at least 60% of average design capacity or plan over a continuous period. Management assesses the operation’s ability to sustain production over a period of approximately one to three months, depending on the complexity related to the stability of continuous operation. Commercial production is considered to have commenced, and depreciation expense is recognized, at the beginning of the month after criteria have been met. (vi) Capitalized borrowing costs: The Group capitalizes borrowing costs that are directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale. Capitalization of borrowing costs ceases once the qualifying assets commence commercial production or are otherwise ready for their intended use or sale. Where funds are borrowed specifically to finance a project, the amount capitalized represents the actual borrowing costs incurred. Where the funds used to finance a project form part of general borrowings, the amount capitalized is calculated using a weighted average of interest rates applicable to relevant general borrowings of the Group during the period, to a maximum of actual borrowing costs incurred. Investment income earned by temporarily investing specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Capitalization of interest is suspended during extended periods in which active development is interrupted. All other borrowing costs are recognized in the consolidated income statements in the period in which they are incurred. (vii) Capitalized stripping costs: Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized. Capitalized stripping costs are included in “mining properties” within property, plant and equipment. Capitalized stripping costs are depreciated using a units-of-production method over the expected reserves within a given phase of mine development. (j) Impairment of non-financial assets: At the end of each reporting period, the Group reviews the carrying amounts of property, plant and equipment, exploration and evaluation assets and intangible assets - computer software to determine whether there is any indication of impairment. If any such indication exists, the Group estimates the recoverable amount of the asset in order to determine the extent of the impairment loss, if any. The Group generally assesses impairment at the level of CGUs, which are the smallest identifiable groups of assets that generate cash inflows that are largely independent of cash inflows from other assets. The Group's CGUs consist of Manitoba, Peru, Arizona and exploration and evaluation assets. The Group allocates exploration and evaluation assets to CGUs based on their operating segment, geographic location and management’s intended use for the property. Exploration and evaluation assets are allocated to CGUs separate from those containing producing or development-phase assets, except where exploration and evaluation assets have the potential to significantly affect the future production of producing or development-phase assets. Goodwill, if recorded, is tested for impairment annually and whenever there is an indication that the asset may be impaired. Where an indicator of impairment exists, a formal estimate of the recoverable amount of the asset or CGU is made. The recoverable amount is the higher of the fair value less costs of disposal and value in use: - Fair value less costs of disposal is the amount obtainable from the sale of the asset or CGU in an arm’s length transaction between knowledgeable, willing parties, less costs of disposal. Fair value for mineral assets is often determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account. These cash flows are discounted by an appropriate discount rate that reflects current market assessments of the time value of money and the risks specific to the asset to arrive at a net present value of the asset. - Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset or CGU in its present form and its eventual disposal, discounted using a pre-tax rate that reflects current market assessments of the time value of money and risks specific to the asset for which estimates of future cash flows have not been adjusted. Value in use calculations apply assumptions specific to the Group’s continued use and cannot take into account future development. These assumptions are different to those used in calculating fair value, and consequently the value in use calculation is likely to give a different result to a fair value calculation. The Group estimates future cash flows based on estimated future recoverable mine production, expected sales prices (considering current and historical commodity prices, price trends and related factors), production levels and cash costs of production, all based on detailed engineering LOM plans. Future recoverable mine production is determined from reserves and resources after taking into account estimated dilution and recoveries during mining, and estimated losses during ore processing and treatment. Estimates of recoverable production from measured, indicated and inferred mineral resources not included in the LOM plan are assessed for economic recoverability and may also be included in the valuation of fair value less costs of disposal. Gains from the expected disposal of assets are not included in estimated future cash flows. Assumptions underlying future cash flow estimates are subject to risks and uncertainties. Changes in estimates may affect the expected recoverability of the Group's investments in mining properties. If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount is reduced to the recoverable amount, and an impairment loss is recognized in the consolidated income statements in the expense category consistent with the function of the impaired asset or CGU. The Gro

New standards

New standards	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
New standards [Text Block]	4. New standards New standards and interpretations not yet adopted (a) IFRS 9, Financial Instruments (“IFRS 9”) Issued on July 24, 2014, IFRS 9 is the IASB’s replacement of IAS 39, Financial Instruments: Recognition and Measurement The Group is close to finalizing its determination of the effect of adoption of IFRS 9 on its consolidated financial statements; the following is noted; - Investments previously classified as Available for Sale (“AFS”) investments will no longer be measured at fair value through other comprehensive income (“FVTOCI”). Under IFRS 9, they will be measured at FVTPL. In addition, they are now called “Investments at fair value through profit or loss.” Retrospectively, the accumulated OCI reserve balance will be closed to retained earnings, resulting in an opening retained earnings adjustment. The change in fair value of the investments will be restated and recognized as finance income/expense retrospectively and going forward. A line item within finance income and expenses called “Mark-to-market adjustments for investments at fair value through profit or loss” will be utilized for changes in fair value of the investments. At current accumulated other OCI values, the restatement will cause an increase to previously reported earnings for the consolidated balance sheets of January 1, 2017 and December 31, 2017. - There is no longer a concept of impairment to such investments under IFRS 9, all impairments of AFS investments that had been recognized within the consolidated income statements will need to be restated and re-classified to the “Mark-to-market adjustments for investments at fair value through profit or loss” line item. There is no impact to earnings as a result of this. - The Joint venture receivable related to our Arizona Business Unit will be measured at FVTPL. This requires management to discount the receivable balance as of January 1, 2017, using a risk adjusted market participant discount rate. There will be no earnings impact on previously stated results from this adjustment. - The embedded derivatives within our provisionally priced sales receivables are no longer permitted to be bi-furcated from the accounts receivable recorded; therefore, both will be presented together on the financial statements, and provisionally priced sales receivables will be recorded at FVTPL. There is no impact to the financial statements as a result of this adjustment. - An expected credit loss model will be used to impair any financial assets measured at amortized cost when material. No material impacts are expected to be noted. The standard will be applied retrospectively restating prior period comparatives as of January 1, 2018. (b) IFRS 15, Revenue from Contracts with Customers (“IFRS 15”) In May 2014, the IASB issued IFRS 15 which is effective for periods beginning on or after January 1, 2018 and is to be applied retrospectively. IFRS 15 clarifies the principles for recognizing revenue from contracts with customers. IFRS 15 will also result in enhanced disclosures about revenue, provide guidance for transactions that were not previously addressed comprehensively (i.e. service revenue and contract modifications) and improve guidance for multiple-element arrangements. The Group is close to finalizing its determination of the effect of adoption of IFRS 15 on its consolidated financial statements; the following is noted: Metal revenue not subject to precious metals stream contracts - The group does not expect differences pertaining to the timing or the amount of revenue recognition for either concentrate (copper, zinc, molybdenum) or finished zinc sales. - Within sales contracts with customers, separate performance obligations may arise pertaining to the shipping of goods sold. Where significant, costs and the revenue allocated to this separate performance obligation are recognized over the period of time the goods sold are shipped, on a gross basis. No material impacts are expected as a result of separate performance obligations. - The Group will disclose revenue generated from changes in mark-to-market of its provisionally priced sales separately from contract metal sales to customers. This will create differences in revenue by metal type as reported previously due to fair value adjustments subsequent to initial provisional invoicing being reported on a separate line. Metal revenue subject to precious metal stream contracts - Since the stream deposits were received in advance of the Group's performance of its obligation, there is an inherent financing component in the transaction. The Group’s deferred revenue balance associated with stream transactions will be adjusted to reflect a change in drawdown rates due to the recognition of a significant financing component on existing streaming transactions. - The Group has preliminarily determined that the stream contracts are within the scope of IFRS 15 variable consideration guidance. As such, the deferred revenue drawdown rate requires the use of certain resources in the calculation that are beyond proven and probable reserves which management is reasonably confident are transferable to reserves. With this approach, it is highly probable that changes in subsequent reserve and resource estimates will not result in a significant revenue reversal of previously recognized revenue. The impact of this expected adjustment is to lower the deferred revenue drawdown rate compared to previously reported rates. - As a result of the above expected changes to the accounting for stream contracts, it is expected that adjustments to previously reported periods will cause a material net increase to previously reported precious metals revenues and finance expenses as well as increases to the carrying value of the deferred revenue deposit. The standard will be applied using the full retrospective approach as of January 1, 2018 and 2017 comparative information. (c) IFRS 16, Leases (“IFRS 16”) In January 2016, the IASB issued this standard which is effective for periods beginning on or after January 1, 2019, which replaces the current guidance in IAS 17, Leases (“IAS 17”), and is to be applied either retrospectively or using a modified retrospective approach. Early adoption is permitted, but only in conjunction with IFRS 15, Revenue from Contracts with Customers. The Group will adopt the standard when it becomes effective. Under IAS 17, lessees were required to make a distinction between a finance lease (on balance sheet) and an operating lease (off balance sheet). IFRS 16 now requires lessees to recognize a lease liability reflective of future lease payments and a “right-of-use asset” for virtually all lease contracts. The Group has not yet determined the effect of adoption of IFRS 16 on its consolidated financial statements.

Revenue and expenses

Revenue and expenses	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Revenue and expenses [Text Block]	5. Revenue and expenses (a) Revenue The Group’s revenue by significant product types: Year ended December 31, 2017 2016 Copper $ 925,074 $ 835,470 Zinc 352,941 236,971 Gold 130,837 119,792 Silver 45,793 52,108 Other 13,974 2,719 1,468,619 1,247,060 Treatment and refining charges (106,066 ) (118,382 ) $ 1,362,553 $ 1,128,678 Included in revenue for the year ended December 31, 2017 are losses related to unrealized non-hedge derivative contracts of $6,089 (year ended December 31, 2016 - losses of $19,180). (b) Depreciation and amortization Depreciation of property, plant and equipment and amortization of intangible assets are reflected in the consolidated income statements as follows: Year ended December 31, 2017 2016 Cost of sales $ 292,880 $ 298,630 Selling and administrative expenses 355 504 $ 293,235 $ 299,134 (c) Share-based payment expenses Share-based payment expenses are reflected in the consolidated income statements as follows: Cash-settled Total share-based RSUs DSUs payment expense Year ended December 31, 2017 Cost of sales $ 1,946 $ - $ 1,946 Selling and administrative expenses 9,667 2,982 12,649 Other operating expenses 1,324 - 1,324 $ 12,937 $ 2,982 $ 15,919 Year ended December 31, 2016 Cost of sales $ 860 $ - $ 860 Selling and administrative expenses 6,452 2,111 8,563 Other operating expenses 464 - 464 $ 7,776 $ 2,111 $ 9,887 (d) Employee benefits expense This table presents employee benefit expense recognized in the Group's consolidated income statements, including amounts transferred from inventory upon sale of goods: Year ended December 31, 2017 2016 Current employee benefits $ 147,760 $ 136,299 Profit-sharing plan expense 19,757 5,064 Share-based payments (notes 5c, 18, 23) Cash-settled restricted share units 12,937 7,776 Cash-settled deferred share units 2,982 2,111 Employee share purchase plan 1,328 1,303 Post-employment pension benefits Defined benefit plans 10,132 12,121 Defined contribution plans 2,443 1,061 Past service costs 10,442 - Other post-retirement employee benefits 7,250 7,406 Termination benefits 419 1,810 $ 215,450 $ 174,951 Manitoba has a profit sharing plan required by the collective bargaining agreement whereby 10% of Manitoba’s after tax profit (excluding provisions or recoveries for deferred income tax and deferred mining tax) for any given fiscal year will be distributed to all eligible employees in the Flin Flon/Snow Lake operations, with the exception of executive officers and key management personnel. Peru has a profit sharing plan required by Peruvian law whereby 8% of Peru’s taxable income will be distributed to all employees within Peru’s operations. The Group has an employee share purchase plan for executives and other eligible employees where participants may contribute between 1% and 10% of their pre-tax base salary to acquire Hudbay shares. The Group makes a matching contribution of 75% of the participant’s contribution. See note 19 for a description of the Group's pension plans and note 20 for the Group's other employee benefit plans. (e) Other operating (income) expenses Year ended December 31, 2017 2016 Regional costs $ 4,308 $ 4,388 Constancia insurance recovery (12,857 ) - Realized gain on contingent consideration of Balmat (6,400 ) Other expenses 2,509 6,198 $ (12,440 ) $ 10,586 During the first and third quarters of 2017, the Group received cash from its insurers and counterparties to partially indemnify the Group for losses suffered as a result of an incident in 2015 that caused damage to Line 2 of the Constancia processing facilities and a delay in commissioning the process plant. During the fourth quarter of 2017, the Group realized a gain from contingent consideration received upon the sale of Balmat in 2015 as a result of certain project milestones being achieved. (f) Finance income and expenses Year ended December 31, 2017 2016 Finance income $ (2,849 ) $ (2,792 ) Finance expense Interest expense on long-term debt 87,819 108,767 Accretion on financial liabilities at amortized cost 1,302 1,316 Unwinding of discounts on provisions 4,159 2,586 Tender premium on 9.50% senior unsecured notes - 47,718 Withholding taxes 9,641 10,083 Other finance expense 13,256 11,306 116,177 181,776 Interest capitalized (13,149 ) (14,705 ) 103,028 167,071 Other finance losses (gains) Net foreign exchange loss (gain) 15,772 (489 ) Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants (1,051 ) 2,111 Embedded derivatives 1,790 (1,238 ) Investments classified as held-for-trading (80 ) (119 ) Reclassified from other comprehensive income on disposal of available-for-sale investments (89 ) (1,475 ) Reclassified from other comprehensive income on impairment of available-for-sale investments 2,059 1,102 18,401 (108 ) Net finance expense $ 118,580 $ 164,171 Interest expense related to certain long-term debt has been capitalized to the Rosemont project until commercial production is reached. Other finance expense relates primarily to non-interest facility fees on financing instruments. (g) Impairment During the year ended December 31, 2017, the Group recorded impairment losses of $11,320 for non-current assets. For the year ended December 31, 2016, the Group recorded no impairment losses. Manitoba Pre-tax impairment to: Property, plant & equipment (note 11) $ 11,320 Tax impact - (recovery) (3,849 ) After-tax impairment charge $ 7,471 As a result of analyzing various scenario planning alternatives surrounding the Stall mill and New Britannia processing facilities, it was determined that certain assets that were previously purchased to build a new concentrator in Snow Lake, Manitoba are no longer useful. As a result, during the year ended December 31, 2017, the Group recognized an impairment loss of $11,320 related to these assets. The impairment was determined based on the difference between carrying value and fair value less costs of disposal. The Group presented the impairment losses within the Manitoba segment in note 30. The fair value measurements for the determination of impairment charges in their entirety are categorized as Level 2 based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value.

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Cash and cash equivalents [text block]	6. Cash and cash equivalents Dec. 31, 2017 Dec. 31, 2016 Cash on hand and demand deposits $ 356,499 $ 129,850 Short-term money market instruments with maturities of three months or less at acquisition date - 17,014 $ 356,499 $ 146,864

Trade and other receivables

Trade and other receivables	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Trade and other receivables [text block]	7. Trade and other receivables Dec. 31, 2017 Dec. 31, 2016 Current Trade receivables $ 119,055 $ 85,386 Embedded derivatives - provisional pricing (note 26c) 17,427 12,538 Statutory receivables 13,961 43,808 Receivable from joint venture partners 2,808 - Other receivables 2,271 10,835 155,522 152,567 Non-current Taxes receivable 14,394 12,424 Receivable from joint venture partners 16,414 18,681 Other receivables 1,651 1,543 32,459 32,648 $ 187,981 $ 185,215 As at December 31, 2017, $10,905 (December 31, 2016 - $42,273) of the current statutory receivables relates to refundable sales taxes in Peru that Hudbay Peru has paid on capital expenditures and operating expenses. The non-current receivable from joint venture partners is for the Group’s joint venture partner for the Rosemont project in Arizona.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Inventories [text block]	8. Inventories Dec. 31, 2017 Dec. 31, 2016 Current Stockpile $ 13,468 $ 9,368 Work in progress 1 14,552 9,100 Finished goods 71,906 54,583 Materials and supplies 41,756 39,413 141,682 112,464 Non-current Materials and supplies 5,809 4,537 $ 147,491 117,001 1 The cost of inventories recognized as an expense, including depreciation, and included in cost of sales amounted to $855,141 for the year ended December 31, 2017 (year ended December 31, 2016 - $803,802).

Other financial assets

Other financial assets	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Other financial assets [text block]	9. Other financial assets Dec. 31, 2017 Dec. 31, 2016 Current Derivative assets $ 2,841 $ 3,397 Non-current Available-for-sale investments 21,973 13,508 Investments at fair value through profit or loss 282 192 Restricted cash (note 26d) 206 17,148 22,461 30,848 $ 25,302 $ 34,245 Available-for-sale investments Available-for-sale investments consist of investments in Canadian metals and mining companies, most of which are publicly traded. During the years ended December 31, 2017 and 2016, the Group recognized impairment losses on investments in listed shares and transferred pre-tax losses of $2,059 and $1,102, respectively, from the available-for-sale reserve within equity to the consolidated income statements (note 5f). The following table summarizes the change in available-for-sale investments: Dec. 31, 2017 Dec. 31, 2016 Balance, beginning of year $ 13,508 $ 9,206 Additions 5,265 2,857 Increase from remeasurement to fair value 2,507 3,598 Disposals (229 ) (2,206 ) Effect of movements in exchange rates 922 53 Balance, end of year $ 21,973 $ 13,508

Intangible assets - computer so

Intangible assets - computer software	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Intangible assets - computer software [text block]	10. Intangible assets - computer software Dec. 31, 2017 Dec. 31, 2016 Cost Balance, beginning of year $ 16,998 $ 16,179 Additions 1,203 407 Effects of movement in exchange rates 968 412 Balance, end of year 19,169 16,998 Accumulated amortization Balance, beginning of year 10,384 7,320 Amortization for the year 2,541 2,882 Effects of movement in exchange rates 669 182 Balance, end of year 13,594 10,384 Net book value $ 5,575 $ 6,614

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Property, plant and equipment [text block]	11. Property, plant and equipment Exploration and Capital evaluation works in Mining Plant and Dec. 31, 2017 assets progress properties equipment Total Cost Balance, beginning of year $ 15,015 $ 844,759 $ 1,775,432 $ 2,368,658 $ 5,003,864 Additions 7,000 156,807 - 26,830 190,637 Capitalized stripping and development - - 69,178 - 69,178 Decommissioning and restoration - 51 5,509 5,101 10,661 Interest capitalized - 13,149 - - 13,149 Transfers and other movements - (79,671 ) - 79,671 - Impairment - (11,320 ) - - (11,320 ) Disposals - (13 ) (1,600 ) (9,586 ) (11,199 ) Effects of movement in exchange rates 995 2,955 49,184 47,553 100,687 Other - 6,814 85 455 7,354 Balance, end of year 23,010 933,531 1,897,788 2,518,682 5,373,011 Accumulated depreciation Balance, beginning of year - - 523,460 614,581 1,138,041 Depreciation for the year - - 118,754 182,552 301,306 Disposals - - - (7,540 ) (7,540 ) Effects of movement in exchange rates - - 31,516 28,741 60,257 Other - - (19 ) 72 53 Balance, end of year - - 673,711 818,406 1,492,117 Net book value $ 23,010 $ 933,531 $ 1,224,077 $ 1,700,276 $ 3,880,894 Exploration and Capital evaluation works in Mining Plant and Dec. 31, 2016 assets progress properties equipment Total Cost Balance, beginning of year $ 14,650 $ 812,618 $ 1,603,952 $ 2,289,556 $ 4,720,776 Additions - 87,505 45,383 15,445 148,333 Capitalized stripping and development - 19,666 48,886 - 68,552 Decommissioning and restoration - (46 ) 1,966 23,036 24,956 Interest capitalized - 14,705 - - 14,705 Transfers and other movements - (89,506 ) 56,848 32,658 - Disposals - (1,501 ) - (11,089 ) (12,590 ) Effects of movement in exchange rates 365 1,334 18,382 18,897 38,978 Other - (16 ) 15 155 154 Balance, end of year 15,015 844,759 1,775,432 2,368,658 5,003,864 Accumulated depreciation Balance, beginning of year - - 394,098 436,402 830,500 Depreciation for the year - - 119,420 178,175 297,595 Disposals - - - (9,160 ) (9,160 ) Effects of movement in exchange rates - - 9,810 9,076 18,886 Other - - 132 88 220 Balance, end of year - - 523,460 614,581 1,138,041 Net book value $ 15,015 $ 844,759 $ 1,251,972 $ 1,754,077 $ 3,865,823 Refer to note 3i for a description of depreciation methods used by the Group and note 3i(iv) for depreciation rates of major classes of assets. Depreciation of property, plant and equipment and intangible assets related to producing properties is initially recognized in inventory and is then transferred to the cost of sales in the consolidated income statements as sales occur. Refer to note 5b for amounts recognized in the consolidated income statements. For non-financial assets, management examined internal and external indicators of impairment or reversals. With the exception of certain mill assets currently stored in Winnipeg, Manitoba (refer to note 5g), no indicators of impairment or reversals of non-financial assets as at year ended December 31, 2017 were found.

Trade and other payables

Trade and other payables	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Trade and other payables [text block]	12. Trade and other payables Dec. 31, 2017 Dec. 31, 2016 Trade payables $ 71,336 $ 80,509 Accruals and payables 86,078 78,154 Accrued interest 34,848 4,300 Exploration and evaluation payables 186 64 Embedded derivatives - provisional pricing (note 26c) 373 86 Statutory payables 6,296 6,549 $ 199,117 $ 169,662 Accruals and payables include operational and capital costs and employee benefit amounts owing.

Other liabilities

Other liabilities	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Other liabilities [text block]	13. Other liabilities Dec. 31, 2017 Dec. 31, 2016 Current Provisions (note 18) $ 27,370 $ 14,367 Pension liability (note 19) 19,401 24,635 Other employee benefits (note 20) 2,756 2,356 Unearned revenue 2,435 849 $ 51,962 $ 42,207

Other financial liabilities

Other financial liabilities	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Other financial liabilities [Text Block]	14. Other financial liabilities Dec. 31, 2017 Dec. 31, 2016 Current Derivative liabilities $ 16,140 $ 10,682 Warrants at fair value through profit and loss 6,961 - Contingent consideration - gold price option 732 - Other financial liabilities at amortized cost 2,360 2,813 Embedded derivatives 297 - 26,760 13,495 Non-current Contingent consideration - gold price option - 570 Warrants at fair value through profit and loss - 7,588 Other financial liabilities at amortized cost 19,938 20,185 Embedded derivatives 863 - 20,801 28,343 $ 47,561 $ 41,838 Other financial liabilities at amortized cost relate to agreements with communities near the Constancia operation which allow Hudbay to extract minerals over the useful life of the Constancia operation, carry out exploration and evaluation activities in the area and provide Hudbay with community support to operate in the region. The derivative liabilities include derivative and hedging transactions as well as warrants issued as consideration for the acquisition of Augusta Resource Corporation. Derivative liabilities are carried at their fair value with changes in fair value recorded to the consolidated income statements in other finance (gain) loss. The fair value of derivative and hedging transactions are determined based on internal valuation models and the fair value of warrants issued are determined based on the quoted market prices for the listed warrants. A total of 21,830,490 warrants were issued which entitle the holder to acquire a common share of the Company at a price of C$15.00 per share on, but not prior to, July 20, 2018. The Company, may, at its option, upon written notice to the warrant holders, settle the exercise of warrants for the in-the-money value, in cash, shares or a combination thereof. The purchase price of the acquisition of New Britannia Mine and Mill contained an option (European) that pays the seller $5,000 if the price of gold is equal to or above $1,400 /oz on May 4, 2018. The option represents a financial liability and was recorded at fair value at the acquisition date of New Britannia and will be remeasured at each reporting date with the change in the fair value being recognized as unrealized gains or losses in finance income and expense.

Finance lease obligations

Finance lease obligations	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Finance lease obligations [text block]	15. Finance lease obligations Dec. 31, 2017 Dec. 31, 2016 Total minimum lease payments $ 89,750 $ 13,720 Effect of discounting (5,177 ) (788 ) Present value of minimum lease payments 84,573 12,932 Less: current portion (18,327 ) (3,172 ) 66,246 9,760 Minimum payments under finance leases Less than 12 months 20,186 3,508 13-36 months 40,253 6,667 37-60 months 29,311 3,545 More than 60 months - - $ 89,750 $ 13,720 The Group has entered into equipment leases for its South American and Manitoba business units which expire between 2020 and 2022 and with interest rates between 1.95% to 4.45%, per annum. The Group has the option to purchase the equipment and vehicles leased at the end of the terms of the leases. The Group’s obligations under finance leases are secured by the lessor’s title to the leased assets. The present value of the net minimum lease payments has been recognized as a finance lease asset, which was included as a non-cash addition to property plant and equipment, and a corresponding amount as a finance lease obligation. The fair value of the finance lease liabilities approximates their carrying amount. During the third quarter of 2017, the Peru business unit refinanced its equipment finance facility (note 16b) by entering into a sale and leaseback transaction with terms as described above. The transaction resulted in cash proceeds of $67,275 (note 29b), the majority of which was used to repay and extinguish the equipment finance facility. As the leaseback is classified as a finance lease, there was no change in the carrying value of the heavy mobile equipment and no impacts to the consolidated income statements.

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Long-term debt [text block]	16. Long-term debt Long-term debt is comprised of the following: Dec. 31, 2017 Dec. 31, 2016 Senior unsecured notes (a) $ 987,903 $ 986,574 Equipment finance facility (b) - 50,267 Senior secured revolving credit facilities (c) - 202,075 Less: Unamortized transaction costs - revolving credit facilities (d) (8,328 ) (6,752 ) 979,575 1,232,164 Less: current portion - (16,490 ) $ 979,575 $ 1,215,674 (a) Senior unsecured notes Balance, January 1, 2016 $ 917,329 Addition to Principal, net of transaction costs 987,671 Payments made (920,000 ) Change in fair value of embedded derivative (prepayment option) (1,146 ) Write-down of unamortized transaction costs 2,216 Accretion of transaction costs and premiums 504 Balance, December 31, 2016 $ 986,574 Transaction costs (133 ) Change in fair value of embedded derivative (prepayment option) 450 Accretion of transaction costs and premiums 1,012 Balance, December 31, 2017 $ 987,903 On December 12, 2016 and December 28, 2016, the Group redeemed for cash all of its outstanding $920,000 aggregate principal amount of 9.50% senior unsecured notes due 2020. The unamortized transaction costs of $2,216 were expensed upon extinguishment of the Group’s 9.50% senior unsecured notes. On December 12, 2016, the Group completed an offering of $1,000,000 aggregate principal amount of senior notes in two series: (i) a series of 7.25% senior notes due 2023 in an aggregate principal amount of $400,000 and (ii) a series of 7.625% senior notes due 2025 in an aggregate principal amount of $600,000. The senior notes are guaranteed on a senior unsecured basis by substantially all of the Company’s subsidiaries, other than HudBay (BVI) Inc. and certain excluded subsidiaries, which include the Company’s subsidiaries that own an interest in the Rosemont project and any newly formed or acquired subsidiaries that primarily hold or may develop non-producing mineral assets that are in the pre-construction phase of development. (b) Equipment finance facility Balance, January 1, 2016 $ 66,521 Transaction costs (1,013 ) Payments made (16,490 ) Accretion of transaction costs 1,249 Balance, December 31, 2016 $ 50,267 Transaction costs (326 ) Payments made (54,364 ) Write-down of unamortized transaction costs 3,552 Accretion of transaction costs 871 Balance, December 31, 2017 $ - The equipment finance facility is reflected in the consolidated balance sheets as follows: Dec. 31, Dec. 31, 2017 2016 Current $ - $ 16,490 Non-current - 33,777 $ - $ 50,267 The equipment finance facility was repaid and extinguished during the third quarter of 2017 resulting in the write-down of unamortized transaction costs. (c) Senior secured revolving credit facilities Balance, January 1, 2016 $ 297,075 Addition to Principal, net of transaction costs 65,000 Payments made (160,000 ) Balance, December 31, 2016 $ 202,075 Addition to Principal 25,000 Payments made (227,075 ) Balance, December 31, 2017 $ - On July 14, 2017, the Group entered into amendments to its two senior credit facilities to secure both facilities with substantially all of the Group’s assets other than assets related to the Rosemont project, amend the financial covenants, extend the maturity dates from March 31, 2019 to July 14, 2021 and reduce the interest rate from LIBOR plus 4.50% to LIBOR plus 3.00%, based on financial results for the twelve months ended June 30, 2017. The two facilities have substantially similar terms and conditions. (d) Unamortized transaction costs - revolving credit facilities Balance, January 1, 2016 $ 6,045 Accretion of transaction costs (4,272 ) New transaction costs 4,979 Balance, December 31, 2016 $ 6,752 Accretion of transaction costs (3,291 ) New transaction costs 4,867 Balance, December 31, 2017 $ 8,328

Deferred revenue

Deferred revenue	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Deferred revenue [text block]	17. Deferred revenue On August 8, 2012 and November 4, 2013, the Group entered into precious metals stream transactions with Wheaton whereby the Group has received aggregate deposit payments of $885,000 against delivery of (i) 100% of payable gold and silver from the 777 mine until the end of 2016, and delivery of 50% of payable gold and 100% of payable silver for the remainder of the 777 mine life; and (ii) 100% of payable silver and 50% of payable gold from the Constancia mine. In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $400 per ounce (for gold) and $5.90 per ounce (for silver), subject to 1% annual escalation after three years. The Group recorded the deposits received as deferred revenue and recognizes amounts in revenue as gold and silver are delivered to Wheaton. The Group determines the amortization of deferred revenue to the consolidated income statements on a per unit basis using the estimated total number of gold and silver ounces expected to be delivered to Wheaton over the life of the 777 and Constancia operations. The Group estimates the current portion of deferred revenue based on deliveries anticipated over the next twelve months. In February 2010, Hudbay Arizona entered into a precious metals stream transaction with Wheaton whereby the Group will receive deposit payments of $230,000 against delivery of 100% of the payable silver and gold from the Rosemont project. The deposit will be payable upon the satisfaction of certain conditions precedent, including the receipt of permits for the Rosemont project and the commencement of construction. In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $450 per ounce (for gold) and $3.90 per ounce (for silver), subject to 1% annual escalation after three years. To date, no such deposit has been received under the terms of this contract. The following table summarizes changes in deferred revenue: Balance, January 1, 2016 $ 597,260 Recognition of revenue (65,762 ) Effects of changes in foreign exchange 6,354 Balance, December 31, 2016 $ 537,852 Recognition of revenue (48,958 ) Effects of changes in foreign exchange 9,150 Balance, December 31, 2017 $ 498,044 Deferred revenue is reflected in the consolidated balance sheets as follows: Dec. 31, 2017 Dec. 31, 2016 Current $ 49,907 $ 65,619 Non-current 448,137 472,233 $ 498,044 $ 537,852

Provisions

Provisions	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Provisions [text block]	18. Provisions Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 liabilities (note 23a ) (note 23a ) Other Total Balance, January 1, 2017 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069 Net additional provisions made 6,485 868 7,327 202 14,882 Amounts used (69 ) (638 ) (5,491 ) (937 ) (7,135 ) Unwinding of discount (note 5f) 4,159 - - - 4,159 Effect of change in discount rate 2,658 - - - 2,658 Effect of foreign exchange 9,512 346 1,194 95 11,147 Effect of change in share price - 2,114 5,327 287 7,728 Balance, December 31, 2017 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 1 Provisions are reflected in the consolidated balance sheets as follows: Current (note 13) $ 2,344 $ 6,623 $ 17,119 $ 1,284 $ 27,370 Non-current 197,697 - 2,290 151 200,138 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 Decommis- sioning, restoration Deferred Restricted and similar share units share units liabilities (note 23a ) (note 23a ) 1 Other Total Balance, January 1, 2016 $ 147,035 $ 2,803 $ 4,388 $ - $ 154,226 Net additional provisions made 30,038 1,018 6,348 1,922 39,326 Amounts used (894 ) (1,078 ) (2,736 ) (430 ) (5,138 ) Unwinding of discount (note 5f) 2,586 - - - 2,586 Effect of change in discount rate (4,189 ) - - - (4,189 ) Effect of foreign exchange 2,720 97 (47 ) 20 2,790 Effect of change in share price - 1,093 3,099 276 4,468 Balance, December 31, 2016 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069 1 Provisions are reflected in the consolidated balance sheets as follows: Current (note 13) $ 1,054 $ 3,933 $ 8,451 $ 929 $ 14,367 Non-current 176,242 - 2,601 859 179,702 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069 Decommissioning, restoration and similar liabilities are remeasured at each reporting date to reflect changes in discount rates, which can significantly affect the liabilities. Decommissioning, restoration and similar liabilities The Group's decommissioning, restoration and similar liabilities relate to the rehabilitation and closure of currently operating mines and metallurgical plants, development-phase properties and closed properties. The amount of the provision has been recorded based on estimates and assumptions that management believes are reasonable; however, actual decommissioning and restoration costs may differ from expectations. During the year ended December 31, 2017 additional provisions were recognized as a result of an increased pit footprint, as per mine plan, at the Constancia operation. During the year ended December 31, 2016 additional provisions were recognized as a result of an increased pit footprint, as per mine plan, at the Constancia operation and an updated closure plan for a site in the Manitoba business unit. In addition, updates to certain closure plans in Manitoba resulted in increases in expected cash outflows. The Group's decommissioning and restoration liabilities relate mainly to its Manitoba operations. Management anticipates that significant decommissioning and restoration activities will take place near the time closure of the mining and processing facilities, anticipated to occur from 2020 for Flin Flon operations and up to 2028 for Snow Lake operations (including the Lalor mine). However, these provisions also reflect estimated post-closure cash flows that extend to 2099 for ongoing monitoring and water treatment requirements. Management anticipates most decommissioning and restoration activities for the Constancia operation will occur from 2035 to 2040. These estimates have been discounted to their present value at rates ranging from 1.43% to 2.74% per annum (2016 - 0.63% to 3.07%), using pre-tax risk-free interest rates that reflect the estimated maturity of each specific liability.

Pension obligations

Pension obligations	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Pension obligations [Text Block]	19. Pension obligations The Group maintains non-contributory and contributory defined benefit pension plans for certain of its employees. The Group uses a December 31 measurement date for all of its plans. For the Group's significant plans, the most recent actuarial valuations filed for funding purposes were performed during 2017 using data as at December 31, 2016. For these plans, the next actuarial valuation required for funding purposes will be performed during 2018 as at December 31, 2017. Movements in the present value of the defined benefit obligation in the current and previous years were as follows: Year ended December 31, 2017 2016 Opening defined benefit obligation $ 349,165 $ 337,004 Current service cost 10,707 10,768 Past service cost related to the new collective bargaining agreement 10,442 - Interest cost 12,602 13,415 Benefits paid from plan (33,721 ) (32,644 ) Benefits paid from employer (999 ) (1,424 ) Participant contributions 93 93 Effects of movements in exchange rates 24,440 10,348 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions 1,598 - Arising from changes in financial assumptions 9,402 14,955 Arising from experience adjustments (675 ) (3,350 ) Closing defined benefit obligation $ 383,054 $ 349,165 The defined benefit obligation closing balance, by member group, is as follows: Dec. 31, 2017 Dec. 31, 2016 Active members $ 250,965 $ 235,815 Deferred members 4,304 3,636 Retired members 127,785 109,714 Closing defined benefit obligation $ 383,054 $ 349,165 Movements in the fair value of the pension plan assets in the current and previous years were as follows: Year ended December 31, 2017 2016 Opening fair value of plan assets: $ 296,151 $ 279,523 Interest income 11,005 11,634 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) 24,437 2,905 Contributions from the employer 22,484 26,198 Employer direct benefit payments 999 1,424 Contributions from plan participants 93 93 Benefit payment from employer (999 ) (1,424 ) Administrative expenses paid from plan assets (80 ) (77 ) Benefits paid (33,721 ) (32,644 ) Effects of changes in foreign exchange rates 21,063 8,519 Closing fair value of plan assets $ 341,432 $ 296,151 The amount included in the consolidated balance sheets arising from the entity's obligation in respect of its defined benefit plans is as follows: Dec. 31, 2017 Dec. 31, 2016 Present value of funded defined benefit obligation $ 365,655 $ 333,720 Fair value of plan assets (341,432 ) (296,151 ) Present value of unfunded defined benefit obligation 17,399 15,445 Net liability arising from defined benefit obligation $ 41,622 $ 53,014 Reflected in the consolidated balance sheets as follows: Dec. 31, 2017 Dec. 31, 2016 Pension obligation - current (note 13) $ 19,401 $ 24,635 Pension obligation - non-current 22,221 28,379 Total pension obligation $ 41,622 $ 53,014 Pension expense is as follows: Dec. 31, 2017 Dec. 31, 2016 Service costs: Current service cost $ 10,707 $ 10,768 Past service cost and loss from settlements 10,442 - Total service cost 21,149 10,768 Net interest expense 1,597 1,781 Administration cost 80 77 Defined benefit pension expense $ 22,826 $ 12,626 Defined contribution pension expense $ 908 $ 829 Remeasurement on the net defined benefit liability: Dec. 31, 2017 Dec. 31, 2016 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ (24,437 ) $ (2,905 ) Actuarial gains arising from changes in demographic assumptions 1,598 - Actuarial losses/(gains) arising from changes in financial assumptions 9,402 14,955 Actuarial gains arising from experience adjustments (675 ) (3,350 ) Defined benefit loss/(gain) related to remeasurement $ (14,112 ) $ 8,700 Total pension cost $ 9,622 $ 22,155 Pension amounts recognized include those directly related to production of inventory; such amounts are recognized initially as costs of inventory and are expensed in the consolidated income statements within cost of sales upon sale of the inventory. The current service cost, the interest cost and administration cost for the year are included in the employee benefits expense. The remeasurement of the net defined benefit liability is included in OCI. Past service costs in 2017 relate to the new collective bargaining agreements in Manitoba. The defined benefit pension plans typically expose the Group to actuarial risks such as: investment risk, interest rate risk, longevity risk and salary risk. Investment risk The present value of the liabilities for the defined benefit plans is calculated using a discount rate determined by reference to high quality corporate bond yields; if the return on plan assets is below this rate, it will create a plan deficit. The Group's primary quantitative investment objectives are maximization of the long term real rate of return, subject to an acceptable degree of investment risk and preservation of principal. Risk tolerance is established through consideration of several factors including past performance, current market condition and the funded status of the plan. Interest risk A decrease in the bond interest rate will increase the pension plan liabilities; however, this will be partially offset by an increase in the return on the plan's debt investments. Longevity risk The present value of the defined benefit plans liabilities is calculated by reference to the best estimate of the mortality of plan participants both during and after their employment. An increase in the life expectancy of the plan participants will increase the pension plans liabilities. Salary risk The present value of the defined benefit plans liabilities for some of the pension plans is calculated by reference to the future salaries of plan participants. As such, an increase in the salary of the plan participants will increase the plans' liabilities. The principal assumptions used for the purposes of the actuarial valuations were as follows: 2017 2016 Defined benefit cost: Discount rate - benefit obligations 3.69 % 4.08% Discount rate - service cost 3.82 % 4.25% Expected rate of salary increase 1 2.75 % 3.00% Average longevity at retirement age for current pensioners (years) 2 Males 20.9 20.8 Females 23.3 23.3 2017 2016 Defined benefit obligation: Discount rate 3.45 % 3.69% Expected rate of salary increase 1 2.75 % 2.75% Average longevity at retirement age for current pensioners (years) 2 Males 21.0 20.9 Females 23.7 23.3 Average longevity at retirement age for current employees (future pensioners) (years) 2: Males 22.9 22.2 Females 25.5 24.5 1 2 The Group reviews the assumptions used to measure pension costs (including the discount rate) on an annual basis. Economic and market conditions at the measurement date affect these assumptions from year to year. In determining the discount rate, the Group considers the duration of the pension plan liabilities. Significant actuarial assumptions for the determination of the defined benefit obligation are discount rate, expected salary increase and mortality. The sensitivity analysis below has been determined based on reasonably possible changes of the respective assumptions occurring at the end of the reporting periods, while holding other assumptions constant: - If the discount rate is 50 basis points higher (lower), the defined benefit obligation would decrease $27,622 (increase by $31,183). - If the expected salary growth increases (decreases) by 1%, the defined benefit obligation would increase by $3,893 (decrease $3,533). - If the life expectancy increases (decreases) by one year for both men and women, the defined benefit obligation would increase by $5,804 (decrease by $5,903) The sensitivity analysis presented above may not be representative of the actual change in the defined benefit obligation as it is unlikely that the change in assumptions would occur in isolation of one another as some of the assumptions may be correlated. Furthermore, in presenting the above sensitivity analysis, the present value of the defined benefit obligation has been calculated using the projected unit credit method at the end of the reporting period, which is the same as that applied in calculating the defined benefit obligation liability recognised in the consolidated balance sheets. The Group’s main pension plans are registered federally with the Office of the Superintendent of Financial Institution and with the Canada Revenue Agency. The registered pension plans are governed in accordance with the Pension Benefits Standards Act and the Income Tax Act. The sponsor contributes the amount needed to maintain adequate funding as dictated by the prevailing regulations. Expected employer contribution to the pension plans for the fiscal year ending December 31, 2018 is $19,401. The average duration of the pension obligation at December 31, 2017 is 15.8 years (2016 – 15.7 years). This number can be broken down as follows: - Active members: 18.4 years (2016: 17.1 years) - Deferred members: 26.9 years (2016: 23.5 years) - Retired members: 10.2 years (2016: 12.4 years) Asset-Liability-Matching studies are performed periodically to analyse the investment policies in terms of risk-and-return profiles. The actual return on plan assets in 2017 was 11.5% (2016: 5.01%) The pension plans do not invest directly in either securities or property/real estate of the Group. With the exception of fixed income investments, the plan assets are actively managed by investment managers, with the goal of attaining returns that potentially outperform passively managed investments. Within appropriate limits, the actual composition of the invested funds may vary from the prescribed investment mix. The following is a summary of the fair value classification levels for investment: December 31, 2017 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 4,625 $ - $ - $ 4,625 Pooled equity funds 116,027 - - 116,027 Pooled fixed income funds - 189,964 - 189,964 Alternative investment funds - 30,699 - 30,699 Balanced funds - 117 - 117 $ 120,652 $ 220,780 $ - $ 341,432 December 31, 2016 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 4,515 $ - $ - $ 4,515 Pooled equity funds 121,103 - - 121,103 Pooled fixed income funds - 143,489 - 143,489 Alternative investment funds - 26,404 - 26,404 Balanced funds - 640 - 640 $ 125,618 $ 170,533 $ - $ 296,151

Other employee benefits

Other employee benefits	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Other employee benefits [text block]	20. Other employee benefits The Group sponsors both other long-term employee benefit plans and non-pension post-employment benefits plans and uses a December 31 measurement date. These obligations relate mainly to commitments for post-retirement health benefits. Information about the Group's post-employment and other long-term employee benefits is as follows: Movements in the present value of the defined benefit obligation in the current and previous years were as follows: Year ended December 31, 2017 2016 Opening defined benefit obligation $ 89,005 $ 80,259 Current service cost 1 2,614 2,579 Interest cost 3,567 3,367 Effects of movements in exchange rates 7,026 2,197 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions 1,172 - Arising from changes in financial assumptions 6,761 2,712 Arising from experience adjustments (120 ) (160 ) Benefits paid (2,196 ) (1,949 ) Closing defined benefit obligation $ 107,829 $ 89,005 1 The defined benefit obligation closing balance, by group member, is as follows: Dec 31, 2017 Dec 31, 2016 Active members $ 64,460 $ 52,611 Inactive members 43,369 36,394 Closing defined benefit obligation $ 107,829 $ 89,005 Movements in the fair value of defined benefit amounts in the current and previous years were as follows: Dec. 31, 2017 Dec. 31, 2016 Employer contributions $ 2,196 $ 1,949 Benefits paid (2,196 ) (1,949 ) Closing fair value of assets $ - $ - The non-pension employee benefit plan obligations are unfunded. Reconciliation of assets and liabilities recognized in the consolidated balance sheets: Dec. 31, Dec. 31, 2017 2016 Unfunded benefit obligation $ 107,829 $ 89,005 Vacation accrual and other - non-current 3,324 2,624 Net liability $ 111,153 $ 91,629 Reflected in the consolidated balance sheets as follows: Dec. 31, Dec. 31, 2017 2016 Other employee benefits liability - current (note 13) $ 2,756 $ 2,356 Other employee benefits liability - non-current 108,397 89,273 Net liability $ 111,153 $ 91,629 Other employee future benefit expense includes the following: Dec. 31, 2017 Dec. 31, 2016 Current service cost 1 $ 2,614 $ 2,579 Net interest cost 3,567 3,367 Components recognized in consolidated income statements $ 6,181 $ 5,946 1 Dec. 31, 2017 Dec. 31, 2016 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ 1,172 $ - Actuarial (gains)/losses arising from changes in financial assumptions 6,761 2,712 Actuarial gains arising from changes experience adjustments (120 ) (160 ) Components recognized in statements of comprehensive income $ 7,813 $ 2,552 Total other employee future benefit cost $ 13,994 $ 8,498 Other employee benefit amounts recognized include those directly related to production of inventory; such amounts are recognized initially as costs of inventory and are expensed in the consolidated income statements within cost of sales upon sale of the inventory. 2017 2016 Defined benefit cost: Discount rate 4.03 % 4.19% Initial weighted average health care trend rate 6.13 % 6.28% Ultimate weighted average health care trend rate 4.00 % 4.00% Average longevity at retirement age for current pensioners (years) 1 Males 21.6 21.6 Females 24.1 24.0 2017 2016 Defined benefit obligation: Discount rate 3.64 % 4.03% Initial weighted average health care trend rate 5.97 % 6.13% Ultimate weighted average health care trend rate 4.00 % 4.00% Average longevity at retirement age for current pensioners (years): Males 21.0 21.6 Females 23.7 24.1 Average longevity at retirement age for current employees (future pensioners) (years): Males 22.9 23.0 Females 25.5 25.3 1 The Group reviews the assumptions used to measure other employee benefit costs (including the discount rate) on an annual basis. The other employee benefit costs typically expose the Group to actuarial risks such as: interest rate risk, health care cost inflation risk and longevity risk. Interest risk A decrease in the bond interest rate will increase the plan liabilities. Health care cost The majority of the plan's benefit obligations are linked to health care cost inflation inflation risk and higher inflation will lead to higher liabilities. The majority of the plans' benefit liability is calculated by reference to the best estimate of the mortality of plan participants both during and after their employment. An increase in the life expectancy of the plan participants will increase the plans Longevity risk liabilities. This is particularly significant for benefits subject to health care cost inflation where increases in inflation result in higher sensitivity to changes in life expectancy. The sensitivity analyses below have been determined based on reasonably possible changes of the respective assumptions occurring at the end of the reporting period, while holding other assumptions constant: - If the discount rate is 50 basis points higher (lower), the defined benefit obligation would decrease by $9,095 (increase by $10,440). - If the health care cost assumption increases (decreases) by 1%, the defined benefit obligation would increase by $21,821 (decrease by $16,888). - If the life expectancy increases (decreases) by one year for both men and women, the defined benefit obligations would increase by $3,917 (decrease by $3,880). The average duration of the non pension post employment obligation at December 31, 2017 is 18.9 years (2016: 18.1 years). This number can be broken down as follows: - Active members: 22.8 years (2016: 22.1 years) - Inactive members: 13.1 years (2016: 12.7 years)

Income and mining taxes

Income and mining taxes	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Income and mining taxes [Text Block]	21. Income and mining taxes (a) Tax expense (recoveries): The tax expense (recoveries) is applicable as follows: Year ended December 31, 2017 2016 Current: Income taxes Canada $ 5,970 $ 7,000 Peru 24,523 - Mining Taxes Canada 4,744 1,309 Peru 14,706 8,971 49,943 17,280 Deferred: Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences Canada 2,636 (24,013 ) Peru 30,721 39,350 United States (46,908 ) 5,617 Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary differences Canada 467 3,739 Peru (613 ) (1,441 ) Adjustments in respect of prior years (1,417 ) 266 (15,114 ) 23,518 $ 34,829 $ 40,798 Adjustments in respect of prior years refers to amounts changing due to the filing of tax returns and assessments from government authorities. (b) Deferred tax assets and liabilities: Dec. 31, 2017 Dec. 31, 2016 Deferred income tax asset Canada $ 35,989 $ 79,483 Deferred income tax liability Canada - (34,379 ) Peru (177,519 ) (149,351 ) United States (107,691 ) (154,600 ) Deferred mining tax liability: Canada (5,615 ) (4,706 ) Peru (11,267 ) (11,880 ) (302,092 ) (354,916 ) Net deferred tax liability balance $ (266,103 ) $ (275,433 ) As of January 1, 2017 the deferred tax assets and deferred tax liabilities attributable to Canada are now disclosed as a net deferred tax asset. This follows from the amalgamation between HudBay Minerals Inc. and its former subsidiaries, Hudson Bay Mining and Smelting Co., Limited (“HBMS”) and Hudson Bay Exploration and Development Company Limited. (c) Changes in deferred tax assets and liabilities: Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Net deferred tax liability balance, beginning of year $ (275,433 ) $ (253,859 ) Deferred income tax expense 15,032 (21,028 ) Deferred mining tax expense 82 (2,490 ) OCI transactions (3,845 ) 2,198 Items charged directly to equity 2,238 - Foreign currency translation on the deferred tax liability (4,177 ) (254 ) Net deferred tax liability balance, end of year $ (266,103 ) $ (275,433 ) (d) Reconciliation to statutory tax rate: As a result of its mining operations, the Group is subject to both income and mining taxes. Generally, most expenditures incurred are deductible in computing income tax, whereas mining tax legislation, although based on a measure of profitability from carrying on mining operations, is more restrictive in respect of the deductions permitted in computing income subject to mining tax. These restrictions include costs unrelated to mining operations as well as deductions for financing expenses, such as interest and royalties. In addition, income unrelated to carrying on mining operations is not subject to mining tax. A reconciliation between tax expense and the product of accounting profit multiplied by the Group’s statutory income tax rate for the years ended December 31, 2017 and 2016 is as follows: Year ended December 31, 2017 2016 Statutory tax rate 27.00% 27.00% Tax expense at statutory rate $ 53,656 $ 1,513 Effect of: Deductions related to mining taxes (6,075 ) (3,223 ) Adjusted income taxes 47,581 (1,710 ) Mining tax expense 19,367 12,771 66,948 11,061 Permanent differences related to: Capital items 1,462 401 Other income tax permanent differences 338 262 Impact of remeasurement on decommissioning liability 15,290 13,803 Temporary income tax differences not recognized 10,015 8,598 Impact related to differences in tax rates in foreign operations 4,605 2,250 Impact of changes to statutory tax rate (52,855 ) 7,960 Foreign exchange on non-monetary items (9,387 ) (3,433 ) Impact related to tax assessments and tax return amendments (1,587 ) (104 ) Tax expense $ 34,829 $ 40,798 (e) Income tax effect of temporary differences - recognized: The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2017 and 2016 are as follows: Balance sheet Income Statement Year ended Year ended Dec. 31, Dec. 31, Dec. 31, Dec. 31, 2017 2016 2017 2016 Deferred income tax (liability) asset/ expense (recovery) Property, plant and equipment $ (102,053 ) $ 1,163 $ 103,216 $ (255 ) Pension obligation 10,034 942 (12,937 ) (215 ) Other employee benefits 16,742 2,972 (13,770 ) (1,471 ) Non-capital losses 91,495 59,034 (32,461 ) (24,098 ) Share issue and debt costs 15,707 16,319 2,850 (14,858 ) Other 4,064 (947 ) (8,810 ) 2,084 Deferred income tax asset / expense (recovery) 35,989 79,483 38,088 (38,813 ) Deferred income tax liability (asset)/ (recovery) expense Property, plant and equipment 313,581 417,060 (103,479 ) 22,810 Pension obligation - (12,150 ) 12,150 4,556 Other employee benefits 192 (14,806 ) 14,998 (2,111 ) Asset retirement obligations (789 ) (11,357 ) 10,568 4,701 Non-capital losses (27,539 ) (46,500 ) 18,961 21,567 Other (235 ) 6,083 (6,318 ) 8,318 Deferred income tax liability/ (recovery) expense 285,210 338,330 (53,120 ) 59,841 Deferred income tax liability/ (recovery) expense $ (249,221 ) $ (258,847 ) $ (15,032 ) $ 21,028 The above reconciling items are disclosed at the tax rates that apply in the jurisdiction where they have arisen. (f) Income tax temporary differences - not recognized: The Group has not recognized a deferred tax asset in respect of the following deductible income tax temporary differences: Dec. 31, Dec. 31, 2017 2016 Property, plant and equipment $ 32,089 $ 16,690 Capital losses 223,916 109,670 Other employee benefits 78,871 52,093 Asset retirement obligations 174,448 135,481 Non-capital losses 104,171 99,737 Temporary differences not recognized $ 613,495 $ 413,671 The deductible temporary differences excluding non-capital losses do not expire under current tax legislation. The Canadian non-capital losses were incurred between 2006 and 2017 and expire between 2026 and 2037. The Group incurred United States net operating losses between 2004 and 2017 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2013 to 2016 which have a four year carry forward period. (g) Mining tax effect of temporary differences: The tax effects of temporary differences that give rise to significant portions of the deferred mining tax assets and liabilities at December 31, 2017 and December 31, 2016 are as follows: Dec. 31, Dec. 31, Canada 2017 2016 Property, plant and equipment $ (5,615 ) $ (4,706 ) Dec. 31, Dec. 31, Peru 2017 2016 Property, plant and equipment $ (11,267 ) $ (11,880 ) For the year ended December 31, 2017, the Group had unrecognized deferred mining tax assets of approximately $8,740 (December 31, 2016 - $7,610) (h) Unrecognized taxable temporary differences associated with investments: There are no taxable temporary differences associated with investments in subsidiaries, associates and joint ventures, for which a deferred tax liability has not been recognized. (i) Taxes receivable/payable: The timing of payments results in significant variances in period-to-period comparisons of the tax receivable and tax payable balances. (j) Other disclosure: The tax rules and regulations applicable to mining companies are highly complex and subject to interpretation. The Group may be subject in the future to a review of its historic income and other tax filings and, in connection with such reviews disputes can arise with the taxing authorities over the interpretation or application of certain tax rules and regulations in respect of the Group’s business. These reviews may alter the timing or amount of taxable income or deductions. The amount ultimately reassessed upon resolution of issues raised may differ from the amount accrued.

Share capital

Share capital	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Share capital [text block]	22. Share capital (a) Preference shares: Authorized: Unlimited preference shares without par value (b) Common shares: Authorized: Unlimited common shares without par value Issued and fully paid: Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Common Common shares Amount shares Amount Balance, beginning of year 237,271,188 $ 1,588,319 235,231,688 $ 1,576,600 Equity issuance 24,000,000 195,295 2,039,500 11,814 Share issue costs, net of tax - (6,205 ) - (95 ) Balance, end of year 261,271,188 $ 1,777,409 237,271,188 $ 1,588,319 On September 27, 2017, the Company issued 24,000,000 Hudbay common shares for net proceeds of $189,090 (net of tax and costs). During the year ended 2016, the Company issued 1,000,000 Hudbay common shares for net proceeds of $4,958 in connection with the vesting of restricted share units. On December 12, 2016 the Company issued 1,039,500 Hudbay common shares and 561,000 Hudbay warrants for net proceeds of $6,761 upon the exercise of 3,300,000 warrants issued by Augusta Resource Corporation which were assumed as part of the acquisition of Hudbay Arizona and which entitled the holder to acquire 0.315 of a Hudbay common share and 0.17 of a Hudbay warrant for each Augusta warrant (note 26e). During the year, the Company paid two semi-annual dividends of C$0.01 per share each. The Company paid $1,774 and $1,912 on March 31, 2017 and September 29, 2017 to shareholders of record as of March 10, 2017 and September 8, 2017, respectively. In 2016, the Company paid $1,773 and $1,794 on March 31, 2016 and September 30, 2016 to shareholders of record as of March 11, 2016 and September 9, 2016, respectively. The Company declared a semi-annual dividend of C$0.01 per share on February 21, 2018. The dividend will be paid on March 29, 2018 to shareholders of record as of March 9, 2018 and is expected to total C$2,613.

Share-based payments

Share-based payments	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Share-based payments [text block]	23. Share-based payments (a) Cash-settled share-based payments: The Group has two cash-settled share-based payment plans, as described below. Deferred Share Units (DSU) At December 31, 2017, the carrying amount and the intrinsic value of the outstanding liability related to the DSU plan was $6,623 (December 31, 2016 - $3,933) (note 18). The following table outlines information related to DSUs granted, expenses recognized and payments made during the year. Year ended Dec. 31, 2017 Dec. 31, 2016 Granted during the year: Number of units 130,964 231,867 Weighted average price (C$/unit) $ 8.59 $ 5.81 Expenses recognized during the year 1 $ 2,982 $ 2,111 Payments made during the year (note 18) $ 638 $ 1,078 1 Restricted Share Units (RSU) RSUs granted under the LTEP Plan may be settled in the form of Hudbay common shares or, at the option of Hudbay, the cash equivalent based on the market price of the common shares as of the vesting date. RSUs may also be granted under Hudbay’s Share Unit Plan, however; the RSUs granted under the Share Unit Plan may only be settled in cash. Hudbay has historically settled all RSUs in cash. The Company has determined that the appropriate accounting treatment is to classify the RSUs as cash-settled transactions. At December 31, 2017, the carrying amount of the outstanding liability related to the RSU plan was $19,409 (December 31, 2016 - $11,052) (note 18). The following table outlines information related to RSUs granted, expenses recognized and payments made in the year. Year ended Dec. 31, 2017 Dec. 31, 2016 Number of units, beginning of year 3,492,408 1,943,507 Number of units granted during the year 987,194 2,576,957 Credits for dividends 8,156 14,776 Number of units forfeited during the year (201,946 ) (133,329 ) Number of units vested 1 (880,099 ) (909,503 ) Number of units, end of year 3,405,713 3,492,408 Weighted average price - granted (C$/unit) $ 10.60 $ 4.01 Expenses recognized during the year 2 $ 12,937 $ 7,776 Payments made during the year (note 18) $ 5,491 $ 2,736 1 2 (b) Equity-settled share-based payment - stock options: The Group's stock option plan was approved in June 2005 and amended in May 2008 (the "Plan"). Under the amended Plan, the Group may grant to employees, officers, directors or consultants of the Group or its affiliates options to purchase up to a maximum of 13 million common shares of the Group. Options granted under the amended Plan have a maximum term of five years and become exercisable as follows: the first 33 1/3% are exercisable after one year, the next 33 1/3% are exercisable after two years, and the last 33 1/3% are exercisable after three years. Except in specified circumstances, options are not assignable and terminate upon, or within a specified time following, the optionee ceasing to be employed by or associated with the Group. The Plan further provides that the price at which common shares may be issued under the Plan cannot be less than the market price of the common shares on the last trading date before the relevant options are approved by the Board. Prior to the May 2008 amendment, the Plan approved in June 2005 allowed the Group to grant options up to 10% (to a maximum of 8 million issued outstanding options) of the issued and outstanding common shares of the Group to employees, officers, and directors of the Group for a maximum term of ten years. Of the common shares covered by the stock option plan, the first 33 1/3% were exercisable immediately, the next 33 1/3% were exercisable after one year, and the last 33 1/3% were exercisable after two years. The Board’s current policy is to not make share option grants to our executives and directors. No options were granted under the Plan during the years ended December 31, 2017 and December 31, 2016, and none have been granted since 2010. The Group estimates expected life of options and expected volatility based on historical data, which may differ from actual outcomes. Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Number Weighted Number Weighted of shares average of shares average subject exercise subject exercise to option price to option price C$ C$ Balance, beginning of year 1,470,377 $ 19.24 1,904,185 $ 17.57 Forfeited (20,002 ) 15.86 (125,677 ) 17.52 Expired (927,023 ) 21.22 (308,131 ) 9.70 Balance, end of year 523,352 $ 15.86 1,470,377 $ 19.24 The following table summarizes the options outstanding: Dec. 31, 2017 Weighted- Weighted- Weighted- average average Number of average Range of Number of remaining exercise options exercise exercise prices options contractual life price exercisable price C$ outstanding (years) C$ C$ $15.86 523,352 0.2 $ 15.86 523,352 $ 15.86 Dec. 31, 2016 Weighted- average Weighted- Number of Weighted- Range of exercise Number of remaining average options average prices options contractual life exercise price exercisable exercise price C$ outstanding (years) C$ C$ $15.86 - 18.33 543,354 1.2 $ 15.86 543,354 $ 15.86 18.34 - 21.28 757,023 0.2 20.80 757,023 20.80 21.29 - 21.98 10,000 0.1 21.75 10,000 21.75 21.99 - 22.97 60,000 0.9 22.20 60,000 22.20 22.98 - 23.74 100,000 0.6 23.74 100,000 23.74 $15.86 - 23.74 1,470,377 0.6 $ 19.24 1,470,377 $ 19.24

Earnings (loss) per share data

Earnings (loss) per share data	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Earnings (loss) per share data [Text Block]	24. Earnings (loss) per share data Year ended December 31, 2017 2016 Basic & diluted weighted average common shares outstanding 243,500,696 235,807,509

Capital management

Capital management	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Capital management [Text Block]	25. Capital management The Group’s definition of capital includes total equity and long-term debt. The Group’s long-term debt balance as at December 31, 2017 was $979,575 (December 31, 2016 – $1,215,674). The Group’s objectives when managing capital are to maintain a strong capital base in order to: - Advance the Group’s corporate strategies to create long-term value for its stakeholders; and - Sustain the Group’s operations and growth throughout metals and materials cycles Hudbay monitors its capital and capital structure on an ongoing basis to ensure they are sufficient to achieve the Group’s short-term and long-term strategic objectives in a capital intensive industry. The Group faces several risks, including volatile metals prices, access to capital, and risk of delays and cost escalation associated with major capital projects. The Group continually assesses the adequacy of its capital structure to ensure its objectives are met. Hudbay monitors its cash and cash equivalents, which were $356,499 as at December 31, 2017 (2016 - $146,864), together with availability under its committed credit facilities. The Group invests its cash and cash equivalents primarily in Canadian bankers’ acceptances, deposits at major Canadian and Peruvian banks, or treasury bills issued by the federal or provincial governments. In addition to the requirement to maintain sufficient cash balances to fund continuing operations, the Group must maintain sufficient cash to fund the interest expense on the long-term debt outstanding (note 16). As part of the Group’s capital management activities, the Group monitors interest coverage ratios and leverage ratios.

Financial instruments

Financial instruments	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Financial instruments [Text Block]	26. Financial instruments (a) Fair value and carrying value of financial instruments: The following presents the fair value ("FV") and carrying value ("CV") of the Group's financial instruments and non-financial derivatives: Dec. 31, 2017 Dec. 31, 2016 Recurring measurements FV CV FV CV Loans and receivables Cash and cash equivalents 1 $ 356,499 $ 356,499 $ 146,864 $ 146,864 Restricted cash 1 206 206 17,148 17,148 Trade and other receivables 1, 2 142,199 142,199 116,445 116,445 Fair value through profit or loss Trade and other receivables - embedded derivatives 3 17,427 17,427 12,538 12,538 Non-hedge derivative assets 3 2,841 2,841 3,397 3,397 Prepayment option - embedded derivative 7 3,980 3,980 4,430 4,430 Investments at FVTPL 4 282 282 192 192 Available-for-sale investments 4 21,973 21,973 13,508 13,508 Total financial assets 545,407 545,407 314,522 314,522 Financial liabilities at amortized cost Trade and other payables 1, 2 192,448 192,448 163,027 163,027 Finance leases 84,573 84,573 12,932 12,932 Other financial liabilities 5 19,625 22,568 17,231 22,998 Senior unsecured notes 6 1,082,740 991,883 1,040,178 991,004 Equipment finance facility 8 - - 50,267 50,267 Senior secured revolving credit facilities 8 - - 202,075 202,075 Unamortized transaction costs 8 (8,328 ) (8,328 ) (6,752 ) (6,752 ) Fair value through profit or loss Embedded derivatives 3 1,533 1,533 86 86 Warrant liabilities 3 6,961 6,961 7,588 7,588 Option liabilities 3 732 732 570 570 Non-hedge derivative liabilities 1,3 16,140 16,140 10,682 10,682 Total financial liabilities 1,396,424 1,308,510 1,497,884 1,454,477 Net financial liability $ (851,017 ) $ (763,103 ) $ (1,183,362 ) $ (1,139,955 ) 1 Cash and cash equivalents, restricted cash, trade and other receivables and trade and other payables are recorded at carrying value, which approximates fair value due to their short-term nature and generally negligible credit losses. 2 Excludes embedded provisional pricing derivatives, as well as tax and other statutory amounts. 3 Derivatives and embedded provisional pricing derivatives are carried at their fair value, which is determined based on internal valuation models that reflect observable forward market commodity prices, currency exchange rates, and discount factors based on market US dollar interest rates adjusted for credit risk. For the warrant and option liabilities, fair value is determined based on quoted market closing price or the Black-Scholes model. 4 Available-for-sale investments are carried at their fair value, which is determined using quoted market bid prices in active markets for listed shares and determined using valuation models for shares of private companies. Investments at FVTPL consist of warrants to purchase listed shares, which are carried at fair value as determined using available market closing prices. 5 These financial liabilities relate to agreements with communities near the Constancia operation in Peru which allow Hudbay to extract minerals over the useful life of the Constancia operation, carry out exploration and evaluation activities in the area and provide Hudbay with community support to operate in the region. Fair values have been determined using a discounted cash flow analysis based on expected cash flows and a credit adjusted discount rate. 6 Fair value of the senior unsecured notes (note 16) has been determined using the quoted market price at the period end. 7 Fair value of the prepayment option embedded derivative related to the long-term debt has been determined using a binomial tree/lattice approach based on the Hull-White single factor interest rate term structure model. 8 The carrying value of the facilities approximates the fair value as the facilities are based on floating interest rates. Fair value hierarchy The table below provides an analysis by valuation method of financial instruments that are measured at fair value subsequent to recognition. Levels 1 to 3 are defined based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value, as follows: - Level 1: Quoted prices in active markets for identical assets or liabilities; - Level 2: Valuation techniques use significant observable inputs, either directly or indirectly, or valuations are based on quoted prices for similar instruments; and - Level 3: Valuation techniques use significant inputs that are not based on observable market data. December 31, 2017 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Embedded derivatives $ - $ 17,427 $ - $ 17,427 Non-hedge derivatives - 2,841 - 2,841 Investments at FVTPL - 282 - 282 Prepayment option embedded derivative - 3,980 - 3,980 Available-for-sale investments 21,973 - - 21,973 $ 21,973 $ 24,530 $ - $ 46,503 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 1,533 $ - $ 1,533 Non-hedge derivatives - 16,140 - 16,140 Option liability - 732 - 732 Warrant liabilities 6,961 - - 6,961 $ 6,961 $ 18,405 $ - $ 25,366 December 31, 2016 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Embedded derivatives $ - $ 12,538 $ - $ 12,538 Non-hedge derivatives - 3,397 - 3,397 Investments at FVTPL - 192 - 192 Prepayment option embedded derivative - 4,430 - 4,430 Available-for-sale investments 12,018 - 1,490 13,508 $ 12,018 $ 20,557 $ 1,490 $ 34,065 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 86 $ - $ 86 Non-hedge derivatives - 10,682 - 10,682 Option liability - 570 - 570 Warrant liabilities 7,588 - - 7,588 $ 7,588 $ 11,338 $ - $ 18,926 The Group's Level 3 investment relates to a minority investment in an unlisted junior mining company. During the twelve months ended December 31, 2017, the Group concluded that the value of the investment was unlikely to be recoverable and revalued the investment to zero. The Group’s policy is to recognize transfers into and transfers out of fair value hierarchy levels as of the date of the event or change in circumstances that caused the transfer. During the year ended December 31, 2017, the Group did not make any transfers. (b) Derivatives and hedging: Copper fixed for floating swaps Hudbay enters into copper fixed for floating swaps in order to manage the risk associated with provisional pricing terms in copper concentrate sales agreements. As at December 31, 2017, the Group had 34,500 tonnes of net copper swaps outstanding at an effective average price of $3.10 /lb and settling across January 2018 to April 2018. At December 31, 2016, the Group had 41,000 tonnes of copper fixed for floating swaps outstanding at an average fixed receivable price $2.42 /lb, which settled across February to June 2017. The aggregate fair value of the transactions at December 31, 2017 was a liability position of $13,786 (December 31, 2016 a liability position of $8,657). Non-hedge derivative gold and silver contracts From time to time, the Group enters into gold and silver forward sales contracts to hedge the commodity price risk associated with the future settlement of provisionally priced deliveries. At December 31, 2017 and December 31, 2016, the Group held no gold or silver forward sales contracts. Non-hedge derivative zinc contracts Hudbay enters into fixed price sales contracts with zinc customers and, to ensure that the Group continues to receive a floating or unhedged realized zinc price, Hudbay enters into forward zinc purchase contracts that effectively offset the fixed price sales contracts. At December 31, 2017, the Group held contracts for forward zinc purchased of 2,808 tonnes (December 31, 2016 – 2,644 tonnes) that related to forward customer sales of zinc. Prices range from $2,534 to $3,292 per tonne (December 31, 2016 – $1,514 to $2,783) and settlement dates extend to December 2018. The aggregate fair value of the transactions at December 31, 2017 was a net asset position of $487 (December 31, 2016 – a net asset position of $1,373). (c) Embedded derivatives Provisional pricing embedded derivatives The Group records embedded derivatives related to provisional pricing in concentrate purchase, concentrate sale and certain other sale contracts. Under the terms of these contracts, prices are subject to final adjustment at the end of a future period after title transfers based on quoted market prices during the quotation period specified in the contract. The period between provisional pricing and final pricing is typically up to three months. Provisional pricing embedded derivatives are presented in trade and other receivables when they relate to sales contracts and in trade and other payables when they relate to purchase contracts. At each reporting date, provisionally priced metals are marked-to-market based on the forward market price for the quotation period stipulated in the contract, with changes in fair value recognized in revenue for sales contracts and in cost of sales for purchase concentrate contracts. Cash flows related to provisional pricing embedded derivatives are classified in operating activities. As at December 31, 2017, the Group’s net position consisted of contracts awaiting final pricing for sales of 38,027 tonnes of copper (December 31, 2016 – 32,750 tonnes). As of December 31, 2017, there are also 6,412 tonnes of zinc ((December 31, 2016 – nil tonnes) awaiting final pricing. In addition, at December 31, 2017, the Group’s net position consisted of contracts awaiting final pricing for sales of 24,553 ounces of gold and 172,886 ounces of silver (December 31, 2016 – 13,827 ounces of gold and 116,912 ounces of silver). As at December 31, 2017, the Group’s provisionally priced copper, zinc, gold and silver sales subject to final settlement were recorded at average prices of $3.29 /lb (December 31, 2016 – $2.51 /lb), $1.51 /oz (December 31, 2016 – nil contracts), $1,309 /oz (December 31, 2016 – $1,151 /oz) and $17.10 /oz (December 31, 2016 – $15.96 /oz), respectively. The aggregate fair value of the copper and zinc embedded derivatives within the copper and zinc concentrate sales contracts at December 31, 2017, was an asset position of $17,427 (December 31, 2016 – an asset position of $12,538). The aggregate fair value of other embedded derivatives at December 31, 2017, was a liability position of $1,533 (December 31, 2016 – a liability position of $86). Prepayment option embedded derivative The senior unsecured notes (note 16) contain prepayment options, which represent embedded derivatives that require bifurcation from the host contract. The prepayment options are measured at fair value, with changes in the fair value being recognized as unrealized gains or losses in finance income and expense (note 5f). The fair value of the embedded derivative at December 31, 2017 was an asset of $3,980 (December 31, 2016 - an asset of $4,430). (d) Restricted cash The South American business unit has $71,932 in letters of credit issued under the Peru facility to support its reclamation obligations. The Manitoba business unit has $56,633 in letters of credit issued under the Canada facility to support its reclamation and pension obligations. Given that these letters of credit are issued under the revolving credit facilities, no cash collateral is required to be posted. Hudbay currently has a restricted cash balance of $206, which consists of cash collateral posted to secure Hudbay Peru letters of credit issued to support certain financial obligations. (e) Warrants and option liabilities A total of 22,391,490 warrants were issued as a result of the acquisition of Hudbay Arizona which entitle the holder to acquire a common share of the Company at a price of C$15.00 per share on, but not prior to, July 20, 2018. The Company, may, at its option, upon written notice to the warrant holders, settle the exercise of warrants for the in-the-money value, in cash, shares or a combination thereof. The purchase price of the acquisition of New Britannia Mine and Mill contained an option (European) that pays the seller $5,000 if the price of gold is equal to or above $1,400 /oz on May 4, 2018. (f) Financial risk management The Group’s financial risk management activities are governed by Board-approved policies addressing risk identification, hedging authorization procedures and limits and reporting. Hudbay's policy objective, when hedging activities are undertaken, is to reduce the volatility of future profit and cash flow within the strategic and economic goals of the Group. The Group from time to time employs derivative financial instruments, including forward and option contracts, to manage risk originating from exposures to commodity price risk, foreign exchange risk and interest rate risk. Significant derivative transactions are approved by the Board of Directors, and hedge accounting is applied when certain criteria have been met. The Group does not use derivative financial instruments for trading or speculation purposes. The following is a discussion of the Group’s risk exposures. (i) Market risk Market risk is the risk that changes in market prices, including foreign exchange rates, commodity prices and interest rates will cause fluctuations in the fair value or future cash flows of a financial instrument. Foreign currency risk The Group’s primary exposure to foreign currency risk arises from: - Translation of Canadian dollar denominated costs and, to a lesser extent, Peruvian soles cost into US dollars. Substantially all of the Group’s revenue are denominated in US dollars, while the majority of its operating costs are denominated in either the Canadian dollar or Peruvian sol. Generally, with gross profit, appreciation of the US dollar relative to the Canadian dollar will increase the Group’s profit. - Translation of foreign currency denominated cash and cash equivalents, trade and other receivables, trade and other payables, as well as other financial liabilities. Appreciation of the US dollar relative to a foreign currency will decrease the net asset value of these balances once they have been translated to US dollars, resulting in foreign currency translation losses on foreign currency denominated assets and gains on foreign currency denominated liabilities. The Manitoba segment’s primary financial instrument foreign currency exposure is on US denominated cash and cash equivalents, trade and other receivables and other financial liabilities. The Peru segment’s primary financial instrument foreign currency exposure is on Peruvian soles cash and cash equivalents, trade and other payables and other financial liabilities. The Group’s exposure to foreign currency risk was as follows based on notional financial instruments amounts stated in US equivalent dollars: Dec. 31, 2017 Dec. 31, 2016 $ CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalents 9,518 $ 20,597 $ 3,692 4,759 $ 8,121 $ 3,440 Trade and other receivables 530 77,824 1,114 720 28,639 2,503 Other financial assets 22,255 - - 13,279 - - Trade and other payables (6,115 ) (9,687 ) (17,917 ) (20,014 ) (4,303 ) (17,145 ) Other financial liabilities (6,961 ) - (22,568 ) (7,588 ) - (22,998 ) $ 19,227 $ 88,734 $ (35,679 ) (8,844 ) $ 32,457 $ (34,200 ) 1 2 3 The following sensitivity analysis for foreign currency risk relates solely to financial instruments and non financial derivatives that were outstanding as at the year end date; each sensitivity calculation assumes all other variables are held constant. This analysis is based on values as at December 31, 2017 and does not reflect the overall effect that changes in market variables would have on the Group's results of operations. Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 5.6 million $ (2.0) million USD/CAD exchange rate 1 - 10% (6.8) million 2.4 million USD/PEN exchange rate 2 + 10% 2.1 million - million USD/PEN exchange rate 2 - 10% (2.6) million - million Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: USD/CAD exchange rate 1 + 10% 3.9 million (1.2) million USD/CAD exchange rate 1 - 10% (4.9) million 1.5 million USD/PEN exchange rate 2 + 10% 2.0 million - million USD/PEN exchange rate 2 - 10% (2.5) million - million 1 2 Commodity price risk Hudbay is exposed to market risk from prices for the commodities the Group produces and sells, such as copper, zinc, gold and silver. From time to time, the Group maintains price protection programs and conducts commodity price risk management through the use of derivative contracts. The following sensitivity analysis for commodity price risk relates solely to financial instruments and non financial derivatives that were outstanding as at the year end date; each sensitivity calculation assumes all other variables are held constant, This analysis is based on values as at December 31, 2017 and does not reflect the overall effect that changes in market variables would have on the Groups’ results of operations. Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Copper prices ($/lb) 3 + $0.30 $ (2.3) million $ - million Copper prices ($/lb) 3 - $0.30 2.3 million - million Zinc prices ($/lb) 4 + $0.10 0.9 million - million Zinc prices ($/lb) 4 - $0.10 (0.9) million - million Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Copper prices ($/lb) 3 + $0.30 $ (4.8 ) million $ - million Copper prices ($/lb) 3 - $0.30 4.7 million - million Zinc prices ($/lb) 4 + $0.10 0.3 million - million Zinc prices ($/lb) 4 - $0.10 (0.3 ) million - million 3 4 Share price risk Hudbay is exposed to market risk from share prices for the Group’s investments in listed Canadian metals and mining companies. These investments are made to foster strategic relationships, in connection with joint venture agreements and for investment purposes. Management monitors the value of these investments for the purposes of determining whether to add or reduce the Group’s positions. The following sensitivity analysis for share price risk relates solely to financial instruments and non financial derivatives that were outstanding as at the year-end date; each sensitivity calculation assumes all other variables are held constant. This analysis is based on values as at December 31, 2017 and does not reflect the overall effect that changes in market variables would have on the Group’s finance expenses. Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Share prices 5 + 25% $ - million $ 5.5 million Share prices 5 - 25% (1.9) million (3.6) million Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Share prices 5 + 25% $ - million $ 4.5 million Share prices 5 - 25% (0.8) million (3.7) million 5 Interest rate risk The group is exposed to cash flow interest rate risk on its cash and cash equivalents, fair value interest rate risk on its embedded derivative associated with its Notes, and interest rate risk on its senior secured revolving credit facilities. This analysis is based on values at December 31, 2017 and does not reflect the overall effect that changes in market variables would have on the group’s finance expenses. Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Interest rates + 2.00% $ 0.4 million $ - million Interest rates - 2.00% (2.8) million - million Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Interest rates + 2.00% $ (5.0) million $ - million Interest rates - 2.00% 0.7 million - million At December 31, 2017 and 2016, the effect of interest rate changes on the Group's cash equivalents would not have resulted in a significant tax impact on profit. Refer to note 6 for information about the Group’s cash and cash equivalents. (ii) Credit risk Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its obligations. The Group’s maximum exposure to credit risk at the reporting date is represented by the carrying amount, net of any impairment losses recognized, of financial assets and non financial derivative assets recorded on the consolidated balance sheets. Refer to note 26a. A large portion of the Group’s cash and cash equivalents are represented by deposits with major Schedule 1 Canadian banks. Deposits and other investments with Schedule 1 Canadian banks represented 97% of total cash and cash equivalents as at December 31, 2017 (2016 – 87%). The Group’s investment policy requires it to comply with a list of approved investment, concentration and maturity limits, as well as credit quality. Credit concentrations in the group’s short term investments are monitored on an ongoing basis. Transactions involving derivatives are with counterparties the Group believes to be creditworthy. Management has a credit policy in place that requires the Group to obtain credit insurance from an investment grade credit insurance provider to mitigate exposure to credit risk in its receivables. At December 31, 2017, approximately 75% of the Group’s trade receivables were insured or payable by letters of credit (2016 - 79% were insured or payable by letters of credit). Insured receivables have a credit insurance deductible of 10%. The deductible and any additional exposure to credit risk is monitored and approved on an ongoing basis. Five customers accounted for approximately 77% of total trade receivables as at December 31, 2017 (2016 – five customers accounted for approximately 79%). Credit risk for these customers is assessed as medium to low risk. As at December 31, 2017, none of the Group’s trade receivables was aged more than 30 days (2016 – nil). (iii) Liquidity risk Liquidity risk is the risk that the Group will not be able to meet its obligations associated with financial liabilities. Hudbay's objective is to maintain sufficient liquid resources to meet operational and investing requirements. The following summarizes the contractual undiscounted cash flows of the Group’s non-derivative and derivative financial liabilities, including any interest payments, by remaining contractual maturity. The table includes all instruments held at the reporting date for which payments had been contractually agreed at the reporting date. The undiscounted amounts shown are gross amounts, unless the liabilities will be settled net. Amounts in foreign currency are translated at the closing rate at the reporting date. When a counterparty has a choice of when an amount is paid, the liability is allocated to the earliest possible time period. Carrying Contractual 12 months More than Dec. 31, 2017 amount cash flows or less 13 - 36 months 37 - 60 months 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 356,499 $ 356,499 $ 356,499 $ - $ - $ - Trade and other receivables 142,199 147,196 124,134 12,403 10,659 - Non-hedge derivative asset 2,841 2,841 2,841 - - - $ 501,539 $ 506,536 $ 483,474 $ 12,403 $ 10,659 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivative $ (192,821 ) $ (192,821 ) $ (192,821 ) $ - $ - $ - Other financial liabilities (22,568 ) (37,216 ) (3,824 ) (4,791 ) (4,780 ) (23,821 ) Long-term debt, including prepayment option embedded derivative (979,575 ) (1,520,416 ) (79,715 ) (159,430 ) (152,396 ) (1,128,875 ) Finance lease liabilities (84,573 ) (89,750 ) (20,186 ) (40,253 ) (29,311 ) - $ (1,279,537 ) $ (1,840,203 ) $ (296,546 ) $ (204,474 ) $ (186,487 ) $ (1,152,696 ) Derivative financial liabilities Warrant liabilities $ (6,961 ) $ (6,961 ) $ (6,961 ) $ - $ - $ - Gold option (732 ) (732 ) (732 ) - - - Non-hedge derivative contracts (16,140 ) (16,140 ) (15,263 ) (877 ) - - $ (23,833 ) $ (23,833 ) $ (22,956 ) $ (877 ) $ - $ - More Carrying Contractual 12 months or than 60 Dec. 31, 2016 amount cash flows less 13 - 36 months 37 - 60 months months Assets used to manage liquidity risk Cash and cash equivalents $ 146,864 $ 146,864 $ 146,864 $ - $ - $ - Trade and other receivables 116,445 116,445 96,221 1,543 18,681 - Non-hedge derivative assets 3,397 3,397 3,397 - - - $ 266,706 $ 266,706 $ 246,482 $ 1,543 $ 18,681 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (163,113 ) $ (163,113 ) $ (163,113 ) $ - $ - $ - Other financial liabilities (22,998 ) (35,392 ) (4,025 ) (3,303 ) (4,616 ) (23,448 ) Long-term debt, including prepayment option embedded derivative (1,232,164 ) (1,946,925 ) (105,278 ) (105,278 ) (544,957 ) (1,191,412 ) Finance lease liabilities (12,932 ) (13,720 ) (3,508 ) (3,338 ) (6,874 ) - $ (1,431,207 ) $ (2,159,150 ) $ (275,924 ) $ (111,919 ) $ (556,447 ) $ (1,214,860 ) Derivative financial liabilities Warrant liabilities $ (7,588 ) $ (7,588 ) $ - $ - $ (7,588 ) $ - Gold option (570 ) (570 ) - - (570 ) - Non-hedge derivative contracts (10,682 ) (10,682 ) (10,682 ) - - - $ (18,840 ) $ (18,840 ) $ (10,682 ) $ - $ (8,158 ) $ -

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Commitments and contingencies [Text Block]	27. Commitments and contingencies (a) Operating lease commitments The Group has entered into various lease commitments for facilities and equipment. The leases expire in periods ranging from one to eight years. There are no restrictions placed on the Group by entering into these leases. Future minimum lease payments under non-cancelable operating leases recognized in operating expenses at December 31 are: 2017 2016 Within one year $ 5,682 $ 5,591 After one year but not more than five years 12,291 12,606 More than five years 1,781 442 $ 19,754 $ 18,639 Payments recognized in operating expenses: 2017 2016 Minimum lease payments $ 4,972 $ 4,575 $ 4,972 $ 4,575 (b) Capital commitments As at December 31, 2017, the Group had outstanding capital commitments in Canada of approximately $25,793 primarily related to equipment on order, of which approximately $2,556 cannot be terminated by the Group; approximately $86,044 in Peru, of which all can be terminated by the Group, and approximately $162,412, primarily related to its Rosemont project, of which approximately $78,646 cannot be terminated by the Group. (c) Contingent liabilities Contingent liabilities The Group is involved in various claims, litigation and other matters arising in the ordinary course and conduct of business. While it is not possible to determine the ultimate outcome of such actions at this time, and inherent uncertainties exist in predicting such outcomes, it is the Group's belief that the ultimate resolution of such actions is not reasonably likely to have a material adverse effect on its consolidated financial position or results of operations. The assessment of contingencies inherently involves the exercise of significant judgement and estimates of the outcome of future events. As a result of the assessment, no significant contingent liabilities have been recorded in these consolidated financial statements. As part of the streaming agreement with Wheaton for the 777 mine, the Group must repay, with precious metals credits, the legal deposit provided by Wheaton by August 1, 2052, the expiry date of the agreement. If the legal deposit is not fully repaid with precious metals credits related to 777 production by the expiry date, a cash payment for the remaining amount will be due at the expiry date of the agreement. As a result of changes in the remaining 777 mine reserves and lower precious metals prices, there is a possibility that an amount of Wheaton’s legal deposit may not be repaid by means of 777 mine’s precious metals credits over its expected remaining mine life. Given that reserve estimates, production timing and precious metals prices are subject to uncertainty, management has concluded that a cash payment at the expiry of the agreement with Wheaton is unlikely. As at December 31, 2017 the fair value of the cash payment is not material to the consolidated financial statements. Contingent assets There were no significant contingent assets to disclose at December 31, 2017 or December 31, 2016.

Related parties

Related parties	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Related parties [Text Block]	28. Related parties (a) Group companies The financial statements include the financial statements of the Company and the following significant subsidiaries: Beneficial ownership of ultimate controlling party (Hudbay Minerals Inc.) Entity's Name Jurisdiction Business Parent 2017 2016 HudBay Marketing & Sales Inc. Canada Marketing and sales HMI 100% 100% HudBay Peru Inc. British Columbia Holding company HMI 100% 100% HudBay Peru S.A.C. Peru Exploration/ development Peru Inc. 100% 100% HudBay (BVI) Inc. British Virgin Islands Precious metals sales Peru Inc. 100% 100% Hudbay Arizona Inc. British Columbia Holding company HMI 100% 100% Rosemont Copper Company 1 Arizona Exploration/ development HudBay Arizona (US) Holding Corporation 100% 100% 1 Transactions between the Company and its subsidiaries, which are related parties of the Company, have been eliminated on consolidation and are not disclosed in this note. (b) Compensation of key management personnel The Group’s key management includes members of the Board of Directors, the Group's Chief Executive Officer, the Group’s senior vice presidents and vice presidents. Total compensation to key management personnel was as follows: 2017 2016 Short-term employee benefits 1 $ 8,654 $ 8,470 Post-employment benefits 777 594 Long-term share-based awards 6,110 5,479 $ 15,541 $ 14,543 1

Supplementary cash flow informa

Supplementary cash flow information	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Supplementary cash flow information [text block]	29. Supplementary cash flow information (a) Change in non-cash working capital: Year ended December 31, 2017 2016 Change in: Trade and other receivables $ (8,979 ) $ 68,270 Other financial assets/liabilities 6,620 19,181 Inventories (18,690 ) 2,653 Prepaid expenses and other current assets (4,619 ) 3,646 Trade and other payables (6,336 ) (8,339 ) Changes in taxes payable/receivable 39,326 3,666 Other 1,693 (1,871 ) $ 9,015 $ 87,206 (b) Non-cash transactions: During the year ended December 31, 2017, the Group entered into the following non-cash investing and financing activities which are not reflected in the consolidated statements of cash flows: - Remeasurements of the Group's decommissioning and restoration liabilities for the year ended December 31, 2017 led to a net increase in related property, plant and equipment assets of $10,661 (year ended December 31, 2016 - $24,956) as a result of declines in discount rates and increased mine activity footprints and the resulting higher disturbance. - Property, plant and equipment included $3,234 of net additions related to capital additions under finance lease (December 31, 2016 - $12,932). - In 2017, the Peru business unit completed the sale of some heavy mobile equipment and then executed a finance lease to leaseback that same equipment. The transaction resulted in cash proceeds of $67,275. Given that the classification of the leaseback as a finance lease, there was no change in the carrying value of the heavy mobile equipment and no impacts to the statements of income.

Segmented information

Segmented information	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Segmented information [Text Block]	30. Segmented information The Group is an integrated metals producer. When making decisions on expansions, opening or closing mines, as well as day to day operations, management evaluates the profitability of the overall operation of the Group. The Group's main mining operations are located in Manitoba and Saskatchewan (Canada) and Cusco (Peru) and are included in the Manitoba segment and Peru segment, respectively. The Manitoba and Peru segments generate the Group's revenue. The Manitoba segment sells copper concentrate (containing copper, gold and silver), zinc metal and other products. The Peru segment consists of the Group's Constancia operation and sells copper concentrate. The Group’s Arizona segment consists of the Group’s Rosemont project in Arizona. Corporate and other activities include the Group’s exploration activities in Chile. The exploration entities are not individually significant, as they do not meet the minimum quantitative thresholds. Corporate activities are not considered a segment and are included as a reconciliation to total consolidated results. Accounting policies for each reported segment are the same as the Company. Results from operating activities represents the profit earned by each segment without allocation of corporate costs. This is the measure reported to the chief operating decision-maker, the Group's President and Chief Executive Officer, for the purposes of resource allocation and the assessment of segment performance. Total assets and liabilities do not reflect intercompany balances, which have been eliminated on consolidation. Year ended December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 704,777 $ 657,776 $ - $ - $ 1,362,553 Cost of sales Mine operating costs 392,863 302,865 - - 695,728 Depreciation and amortization 118,770 174,110 - - 292,880 Gross profit 193,144 180,801 - - 373,945 Selling and administrative expenses - - - 42,283 42,283 Exploration and evaluation 5,649 1,442 - 8,383 15,474 Other operating (income) and expenses (56 ) (6,612 ) 517 (6,289 ) (12,440 ) Asset impairment 11,320 - - - 11,320 Results from operating activities $ 176,231 $ 185,971 $ (517 ) $ (44,377 ) $ 317,308 Finance income (2,849 ) Finance expenses 103,028 Other finance losses 18,401 Profit before tax 198,728 Tax expense 34,829 Profit for the year $ 163,899 Year ended December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 512,671 $ 616,007 $ - $ - $ 1,128,678 Cost of sales Mine operating costs 318,037 289,133 - - 607,170 Depreciation and amortization 120,531 178,099 - - 298,630 Gross profit 74,103 148,775 - - 222,878 Selling and administrative expenses - - - 37,774 37,774 Exploration and evaluation 1,228 1,262 - 2,252 4,742 Other operating expense (income) 5,490 7,790 618 (3,312 ) 10,586 Results from operating activities $ 67,385 $ 139,723 $ (618 ) $ (36,714 ) $ 169,776 Finance income (2,792 ) Finance expenses 167,071 Other finance gains (108 ) Profit before tax 5,605 Tax expense 40,798 Loss for the year $ (35,193 ) December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 743,019 $ 2,666,775 $ 856,589 $ 382,346 $ 4,648,729 Total liabilities 525,515 806,217 110,945 1,061,797 2,504,474 Property, plant and equipment 619,476 2,420,561 836,759 4,098 3,880,894 Year ended December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 97,936 $ 143,372 $ 18,507 - $ 259,815 December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 769,561 $ 2,720,441 $ 822,498 $ 144,056 $ 4,456,556 Total liabilities 528,326 876,056 158,236 1,130,726 2,693,344 Property, plant and equipment 606,348 2,452,917 800,542 6,016 3,865,823 Year ended December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 65,521 $ 125,489 $ 25,856 $ 19 $ 216,885 Geographical Segments The following tables represent revenue information regarding the Group’s geographical segments for the years ended December 31: 2017 2016 Revenue by customer location 1 Canada $ 421,247 $ 372,439 United States 236,467 146,419 Switzerland 159,085 256,377 Germany 144,684 39,703 China 145,935 139,200 Peru 101,033 68,964 Philippines 120,199 70,933 Other 33,903 34,643 $ 1,362,553 $ 1,128,678 1 During the year ended December 31, 2017, four customers accounted for approximately 27%, 11%, 11%, and 5%, respectively, of total revenue during the year. Revenue from these customers has been presented in the Manitoba and Peru operating segments. During the year ended December 31, 2016, five customers accounted for approximately 27%, 22%, 13%, 12%, and 6%, respectively, of total revenue during the year. Revenue from these customers has been presented in the Manitoba and Peru operating segment.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Basis of consolidation [Policy Text Block]	(a) Basis of consolidation: Intercompany balances and transactions are eliminated upon consolidation. When a Group entity transacts with an associate or jointly controlled entity of the Group, unrealized profits and losses are eliminated to the extent of the Group’s interest in the relevant associate or joint venture. The accounting policies of Group entities are changed when necessary to align them with the policies adopted by the Company. Subsidiaries A subsidiary is an entity controlled by the Group. The financial statements of subsidiaries are included in the consolidated financial statements from the date that control commences until the date that control ceases. Business combinations and goodwill When the Group makes an acquisition, it first determines whether the assets acquired and liabilities assumed constitute a business, in which case the acquisition requires accounting as a business combination. Management applies judgement in determining whether the acquiree is capable of being conducted and managed for the purpose of providing a return, considering the inputs of the acquiree and processes applied to those inputs that have the ability to create outputs. The Group applies the acquisition method of accounting to business combinations, whereby the goodwill is measured at the acquisition date as the fair value of the consideration transferred including the recognized amount of any non-controlling interests in the acquiree. When the excess is negative, a bargain purchase gain is recognized immediately in the consolidated income statements. The assessment of fair values on acquisition includes those mineral reserves and resources that are able to be reliably measured. In determining these fair values, management must also apply judgement in areas including future cash flows, metal prices, exchange rates and appropriate discount rates. Changes in such estimates and assumptions could result in significant differences in the amount of goodwill recognized. The consideration transferred is the aggregate of the fair values at the date of acquisition of the sum of the assets transferred, the liabilities incurred or assumed, and the equity instruments issued by the acquirer in exchange for control of the acquiree. Acquisition-related costs are recognized in the consolidated income statements as incurred, unless they relate to issue of debt or equity securities. Where applicable, the consideration transferred includes any asset or liability resulting from a contingent consideration arrangement and measured at its acquisition date fair value. Subsequent changes in such fair values are adjusted against the cost of acquisition where they qualify as measurement period adjustments. All other subsequent changes in the fair value of contingent consideration classified as an asset or liability are accounted for in accordance with relevant IFRS. Changes in the fair value of contingent consideration classified as equity are not recognized. Where a business combination is achieved in stages, the Group's previously held interests in the acquired entity are remeasured to fair value at the acquisition date, which is the date the Group attains control, and any resulting gain or loss is recognized in the consolidated income statements. Amounts previously recognized in other comprehensive income (“OCI”) related to interests in the acquiree prior to the acquisition date are reclassified to the consolidated income statements, where such treatment would be appropriate if that interest were disposed of. After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each of the Group’s CGUs that are expected to benefit from the synergies of the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Goodwill is allocated to the lowest level at which it is monitored for internal management purposes and is not larger than an operating segment before aggregation. Where goodwill forms part of a CGU and part of the operation within that unit is disposed of, the goodwill associated with the disposed operation is included in the determination of any gain or loss on disposal. Goodwill is not amortized and is tested for impairment annually and whenever there is an indication of impairment. If any such indication exists, the recoverable amount of the CGU is estimated in order to determine the extent of the impairment, if any. The recoverable amount is determined as the higher of fair value less direct costs to sell and the CGU’s value in use. An impairment loss in respect of goodwill is not reversed. Fair value for mineral interests and related goodwill is generally determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account. Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset in its present form and its eventual disposal. Value in use is determined by applying assumptions specific to the Group’s continued use and cannot take into account future development. The weighted average cost of capital of the Group or comparable market participants is used as a starting point for determining the discount rates, with appropriate adjustments for the risk profile of the countries in which the individual CGUs operate and the specific risks related to the development of the project. Where the asset does not generate cash flows that are independent of other assets, the Group estimates the recoverable amount of the CGU to which the asset belongs. If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount of the asset or CGU is reduced to its recoverable amount. An impairment loss is recognized as an expense in the consolidated income statements.
Translation of foreign currencies [Policy Text Block]	(b) Translation of foreign currencies: Management determines the functional currency of each Group entity as the currency of the primary economic environment in which the entity operates. Foreign currency transactions Transactions in foreign currencies are translated to the respective functional currencies of Group entities at exchange rates in effect at the transaction dates. At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency using the noon exchange rate. Non-monetary assets and liabilities measured at fair value are translated using the exchange rates at the date when fair value was determined. Non-monetary assets and liabilities measured at historical cost in a foreign currency are translated using exchange rates that were in effect at the transaction dates. The same translations are applied when an entity prepares its financial statements from books and records maintained in a currency other than its functional currency, except revenue and expenses may be translated at monthly average exchange rates that approximate those in effect at the transaction dates. Foreign currency gains and losses arising on period-end revaluations are recognized in the consolidated income statements, except for differences arising on translation of available-for-sale equity instruments, a financial liability designated as a hedge of a net investment in a foreign operation, or qualifying cash flow hedges, which are recognized in OCI. Foreign operations For the purpose of the consolidated financial statements, assets and liabilities of Group entities that have functional currencies other than the US dollar are translated to US dollars at the reporting date using the noon exchange rate. Revenue and expenses are translated at monthly average exchange rates that approximate those in effect at the transaction dates. Differences arising from these foreign currency translations are recognized in OCI and presented within equity in the foreign currency translation reserve. When a foreign operation is disposed, the relevant exchange differences accumulated in the foreign currency translation reserve are transferred to the consolidated income statements as part of the profit or loss on disposal. On the partial disposal of a subsidiary that includes a foreign operation, the relevant proportion of such amount is reattributed to non-controlling interests. On disposal of a partial investment in an associate or joint venture that includes a foreign operation while retaining significant influence or joint control, the relevant proportion is reclassified to profit or loss. Net investment in a foreign operation Foreign currency gains and losses arising on translation of a monetary item receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur in the foreseeable future are considered to form part of a net investment in the foreign operation. Such gains and losses are recognized in OCI and presented within equity in the foreign currency translation reserve.
Revenue recognition [Policy Text Block]	(c) Revenue recognition: Revenue from the sale of goods is measured at the fair value of the consideration received or receivable, net of treatment and refining charges and pre-production revenue. Sales revenue is recognized when the significant risks and rewards of ownership have been transferred to the buyer, the Group has insignificant continuing management involvement with the goods, the amount of revenue can be measured reliably, recovery of the consideration is probable and the associated costs and possible return of goods can be estimated reliably. Transfers of risks and rewards vary depending on individual contract terms and frequently occur at the time when title passes to the customer. For medium and long-term contracts, revenue recognition criteria are assessed for individual sales within the contracts. Revenue from the sale of by-products is included within revenue. Sales of concentrate and certain other products are “provisionally priced”. For these contracts, sales prices are subject to final adjustment at the end of a future period after shipment, based on quoted market prices during the quotational period specified in the contract. Revenue is recognized when the above criteria are met, using weight and assay results and forward market prices to estimate the fair value of the total consideration receivable. Such a provisional sale contains an embedded derivative that must be separated from the host contract. At each reporting date, provisionally priced metals sales are marked to market, with adjustments (both gains and losses) recorded in revenue in the consolidated income statements and in trade and other receivables on the consolidated balance sheets. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. Interest revenue is recognized in finance income as it accrues, using the effective interest method. Dividend revenue from investments is recognized when the shareholder’s right to receive payment has been established provided that it is probable that the economic benefits will flow to the Group and the amount of revenue can be measured reliably.
Cost of sales [Policy Text Block]	(d) Cost of sales: Cost of sales consists of those costs previously included in the measurement of inventory sold during the period, as well as certain costs not included in the measurement of inventory, such as the cost of warehousing and distribution to customers, provisional pricing adjustments related to purchased concentrates, profit sharing, royalty payments, share-based payments and other indirect expenses related to producing operations.
Cash and cash equivalents [Policy Text Block]	(e) Cash and cash equivalents: Cash and cash equivalents include cash, demand deposits and short-term, highly liquid investments that are readily convertible to known amounts of cash and are subject to an insignificant risk of changes in value. Cash equivalents have maturities of three months or less at the date of acquisition. Interest earned is included in finance income on the consolidated income statements and in investing activities on the consolidated statements of cash flows. Amounts that are restricted from being used for at least twelve months after the reporting date are classified as non-current assets and presented in restricted cash on the consolidated balance sheets. Changes in restricted cash balances are classified as investing activities on the consolidated statements of cash flows.
Inventories [Policy Text Block]	(f) Inventories: Inventories consist of stockpiles, in-process inventory (concentrates and metals), metal products and supplies. Concentrates, metals and all other saleable products are valued at the lower of cost and estimated net realizable value. Net realizable value represents the estimated selling price for inventories less all estimated costs of completion and costs necessary to make the sale. Where the net realizable value is less than cost, the difference is charged to the consolidated income statements as an impairment charge in cost of sales. Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized. Cost of production of concentrate inventory is determined on a weighted average cost basis and the cost of production of finished metal inventory is determined using the first in first out basis. The cost of production includes direct costs associated with conversion of production inventory: material, labour, contractor expenses, purchased concentrates, and an attributable portion of production overheads and depreciation of all property, plant and equipment involved with the mining and production process. Hudbay measures in-process inventories based on assays of material received at metallurgical plants and estimates of recoveries in the production processes. Due to significant uncertainty associated with volume and metal content, immaterial costs are not allocated to routine operating levels of stockpiled ore. Estimates and judgements are required to assess the nature of any significant changes to levels of ore stockpiles and determining whether allocation of costs is required. Supplies are valued at the lower of average cost and net realizable value. A regular review is undertaken to determine the extent of any provision for obsolescence.
Intangible assets [Policy Text Block]	(g) Intangible assets: Computer software is measured at cost less accumulated amortization and accumulated impairment losses. Costs include all directly attributable costs necessary to create, produce and prepare the asset to be capable of operating it in the manner intended by management. Amortization methods, useful lives, and residual values if any, are reviewed at each year end and adjusted prospectively, if required. When an intangible asset is disposed of, or when no further economic benefits are expected, the asset is derecognized, and any resulting gain or loss is recorded in the consolidated income statements. Currently, the Group’s intangible assets relate primarily to enterprise resource planning (“ERP”) information systems, which are amortized over their estimated useful lives.
Exploration and evaluation expenditures [Policy Text Block]	(h) Exploration and evaluation expenditures: Exploration and evaluation activity begins when the Group obtains legal rights to explore a specific area and involves the search for mineral reserves, the determination of technical feasibility, and the assessment of commercial viability of an identified resource. Expenditures incurred in the exploration and evaluation phase include the cost of acquiring interests in mineral rights, licenses and properties and the costs of the Group’s exploration activities, such as researching and analyzing existing exploration data, gathering data through geological studies, exploratory drilling, trenching, sampling, and certain feasibility studies. The Group expenses the cost of its exploration and evaluation activities and capitalizes the cost of acquiring interests in mineral rights, licenses and properties in business combinations, asset acquisitions or option agreements. Amounts capitalized are recognized as exploration and evaluation assets and presented in property, plant and equipment. Exploration and evaluation assets acquired as a result of an asset acquisition or option agreement are initially recognized at cost, and those acquired in a business combination are recognized at fair value on the acquisition date. They are subsequently carried at cost less accumulated impairment. No depreciation is charged during the exploration and evaluation phase. The Group expenses the cost of subsequent exploration and evaluation activity related to acquired exploration and evaluation assets. Cash flows associated with acquiring exploration and evaluation assets are classified as investing activities in the consolidated statements of cash flows; those associated with exploration and evaluation expenses are classified as operating activities. Judgement is required in determining whether the respective costs are eligible for capitalization where applicable, and whether they are likely to be recoverable, which may be based on assumptions about future events and circumstances. Estimates and assumptions made may change if new information becomes available. The Group monitors exploration and evaluation assets for factors that may indicate their carrying amounts are not recoverable. If such indicators are identified, the Group tests the exploration and evaluation assets or their CGUs, as applicable, for impairment. The Group also tests impairment when assets reach the end of the exploration and evaluation phase. Exploration and evaluation assets are transferred to capital works in progress within property, plant and equipment once the Group determines that probable future economic benefits will be generated as a result of the expenditures. The Group’s determination of probable future economic benefit is based on management’s evaluation of the technical feasibility and commercial viability of the geological properties of a given ore body based on information obtained through evaluation activities, including metallurgical testing, resource and reserve estimates and the economic assessment of whether the ore body can be mined economically. Tools that may be used to determine this include a preliminary feasibility study, confidence in converting resources into reserves and the probability that the property could be developed into a mine site. At that time, the property is considered to enter the development phase, and subsequent evaluation costs are capitalized.
Property, plant and equipment [Policy Text Block]	(i) Property, plant and equipment: The Group measures items of property, plant and equipment at cost less accumulated depreciation and any accumulated impairment losses. The initial cost of an item of property, plant and equipment includes its purchase price or construction costs, including import duties and non-refundable purchase taxes, any costs directly attributable to bringing the asset into operation, and for qualifying assets, borrowing costs. The initial cost of property, plant and equipment also includes the initial estimate of the cost of dismantling and removing the item and restoring the site on which it is located, the obligation for which the Group incurs either when the item is acquired or as a consequence of having used the item during a particular period for purposes other than to produce inventories during that period. Capitalization of costs ceases once an asset is in the location and condition necessary for it to be capable of operating in the manner intended by management. At this time, depreciation commences. For a new mine, this occurs upon commencement of commercial production. Any revenue earned in the process of preparing an asset to be capable of operating in the manner intended by management is included in the cost of the constructed asset. Any other incidental revenue earned prior to commencement of commercial production is recognized in the consolidated income statements. Carrying amounts of property, plant and equipment, including assets under finance leases, are depreciated to their estimated residual value over the estimated useful lives of the assets or the estimated life of the related mine or plant, if shorter. Where components of an asset have different useful lives, depreciation is calculated on each separate component. Components may be physical or non-physical, including the cost of regular major inspections and overhauls required in order to continue operating an item of property, plant and equipment. Certain items of property, plant and equipment are depreciated on a unit-of-production basis. The unit-of-production method is based on proven and probable tonnes of ore reserves. There are numerous uncertainties inherent in estimating ore reserves, and assumptions that were valid at the reporting date may change when new information becomes available. The actual volume of ore extracted and any changes in these assumptions could affect prospective depreciation rates and carrying values. The carrying amount of an item of property, plant and equipment is derecognized on disposal or when no future economic benefits are expected from its use or disposal. Upon derecognition of an item of property, plant and equipment, the difference between its carrying value and net sales proceeds, if any, is presented as a gain or loss in other operating income or expense in the consolidated income statements. (i) Capital works in progress: Capital works in progress consist of items of property, plant and equipment in the course of construction or mineral properties in the course of development, including those transferred upon completion of the exploration and evaluation phase. On completion of construction or development, costs are transferred to plant and equipment and/or mining properties as appropriate. Capital works in progress are not depreciated. (ii) Mining properties: Mining properties consist of costs transferred from capital works in progress when a mining property reaches commercial production, costs of subsequent mine and exploration development, and acquired mining properties in the production stage. Mining properties include costs directly attributable to bringing a mineral asset into the state where it is capable of operating in the manner intended by management and includes such costs as the cost of shafts, ramps, track haulage drifts, ancillary drifts, pumps, electrical substations, refuge stations, ventilation raises, permanent manways, and ore and waste pass raises. The determination of development costs to be capitalized during the production stage of a mine operation requires the use of judgements and estimates such as estimates of tonnes of waste to be removed over the life of the mining area and economically recoverable reserves extracted as a result. A mining property is considered to be capable of operating in a manner intended by management when it commences commercial production. Upon commencement of commercial production, a mining property is depreciated on a unit-of-production method. Unit-of-production depreciation rates are determined based on the related proven and probable mineral reserves and associated future development costs. Subsequent mine development costs are capitalized to the extent they are incurred in order to access reserves mineable over more than one year. Ongoing maintenance and development expenditures are expensed as incurred and included in cost of sales in profit or loss. These include ore stope access drifts, footwall and hangingwall drifts in stopes, drawpoints, drill drifts, sublevels, slots, drill raises, stope manway access raises and definition diamond drilling. (iii) Plant and equipment: Plant and equipment consists of buildings and fixtures, surface and underground fixed and mobile equipment and assets under finance lease. Plant and equipment are depreciated on either unit-of-production or straight-line basis based on factors including the production life of assets and mineable reserves. In general, mining assets are depreciated using a unit-of-production method; equipment is depreciated using the straight-line method, based on the shorter of its useful life and that of the related mine or facility; and plants are depreciated using the straight-line method, with useful lives limited by those of related mining assets. (iv) Depreciation rates of major categories of assets: — Capital works in progress - not depreciated — Mining properties - unit-of-production — Mining assets - unit-of-production — Plant and Equipment — Equipment - straight-line over 1 to 21 years — Other plant assets - straight-line over 1 to 21 years / unit of production The Group reviews its depreciation methods, remaining useful lives and residual values at least annually and accounts for changes in estimates prospectively. (v) Commercial production: Commercial production is the level of activities intended by management for a mine, or a mine and mill complex, to be capable of operating in the manner intended by management. The Group considers a range of factors when determining the level of activity that represents commercial production for a particular project, including a pre-determined percentage of design capacity for the mine and mill; achievement of continuous production, ramp-ups, or other output; or specific factors such as recoveries, grades, or inventory build-ups. In a phased mining approach, management may consider achievement of specific milestones at each phase of completion. In a non-phased mining approach, management considers average actual metrics that are at least 60% of average design capacity or plan over a continuous period. Management assesses the operation’s ability to sustain production over a period of approximately one to three months, depending on the complexity related to the stability of continuous operation. Commercial production is considered to have commenced, and depreciation expense is recognized, at the beginning of the month after criteria have been met. (vi) Capitalized borrowing costs: The Group capitalizes borrowing costs that are directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time to get ready for their intended use or sale. Capitalization of borrowing costs ceases once the qualifying assets commence commercial production or are otherwise ready for their intended use or sale. Where funds are borrowed specifically to finance a project, the amount capitalized represents the actual borrowing costs incurred. Where the funds used to finance a project form part of general borrowings, the amount capitalized is calculated using a weighted average of interest rates applicable to relevant general borrowings of the Group during the period, to a maximum of actual borrowing costs incurred. Investment income earned by temporarily investing specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Capitalization of interest is suspended during extended periods in which active development is interrupted. All other borrowing costs are recognized in the consolidated income statements in the period in which they are incurred. (vii) Capitalized stripping costs: Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized. Capitalized stripping costs are included in “mining properties” within property, plant and equipment. Capitalized stripping costs are depreciated using a units-of-production method over the expected reserves within a given phase of mine development.
Impairment of non-financial assets [Policy Text Block]	(j) Impairment of non-financial assets: At the end of each reporting period, the Group reviews the carrying amounts of property, plant and equipment, exploration and evaluation assets and intangible assets - computer software to determine whether there is any indication of impairment. If any such indication exists, the Group estimates the recoverable amount of the asset in order to determine the extent of the impairment loss, if any. The Group generally assesses impairment at the level of CGUs, which are the smallest identifiable groups of assets that generate cash inflows that are largely independent of cash inflows from other assets. The Group's CGUs consist of Manitoba, Peru, Arizona and exploration and evaluation assets. The Group allocates exploration and evaluation assets to CGUs based on their operating segment, geographic location and management’s intended use for the property. Exploration and evaluation assets are allocated to CGUs separate from those containing producing or development-phase assets, except where exploration and evaluation assets have the potential to significantly affect the future production of producing or development-phase assets. Goodwill, if recorded, is tested for impairment annually and whenever there is an indication that the asset may be impaired. Where an indicator of impairment exists, a formal estimate of the recoverable amount of the asset or CGU is made. The recoverable amount is the higher of the fair value less costs of disposal and value in use: - Fair value less costs of disposal is the amount obtainable from the sale of the asset or CGU in an arm’s length transaction between knowledgeable, willing parties, less costs of disposal. Fair value for mineral assets is often determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account. These cash flows are discounted by an appropriate discount rate that reflects current market assessments of the time value of money and the risks specific to the asset to arrive at a net present value of the asset. - Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset or CGU in its present form and its eventual disposal, discounted using a pre-tax rate that reflects current market assessments of the time value of money and risks specific to the asset for which estimates of future cash flows have not been adjusted. Value in use calculations apply assumptions specific to the Group’s continued use and cannot take into account future development. These assumptions are different to those used in calculating fair value, and consequently the value in use calculation is likely to give a different result to a fair value calculation. The Group estimates future cash flows based on estimated future recoverable mine production, expected sales prices (considering current and historical commodity prices, price trends and related factors), production levels and cash costs of production, all based on detailed engineering LOM plans. Future recoverable mine production is determined from reserves and resources after taking into account estimated dilution and recoveries during mining, and estimated losses during ore processing and treatment. Estimates of recoverable production from measured, indicated and inferred mineral resources not included in the LOM plan are assessed for economic recoverability and may also be included in the valuation of fair value less costs of disposal. Gains from the expected disposal of assets are not included in estimated future cash flows. Assumptions underlying future cash flow estimates are subject to risks and uncertainties. Changes in estimates may affect the expected recoverability of the Group's investments in mining properties. If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount is reduced to the recoverable amount, and an impairment loss is recognized in the consolidated income statements in the expense category consistent with the function of the impaired asset or CGU. The Group presents impairment losses on the consolidated income statements as part of results from operating activities. Impairment losses recognized in respect of a CGU are allocated first to reduce the carrying amount of any goodwill allocated to the CGU and then to reduce the carrying amounts of other assets in the CGU on a pro-rata basis for depreciable assets. The Group assesses previously recognized impairment losses each reporting date for any indications that the losses have decreased or no longer exist. Such an impairment loss is reversed, in full or in part, if there has been significant changes with a positive effect on the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized for the asset in prior years. Such reversals of impairment losses are recognized in the consolidated income statements. An impairment loss recognized in relation to goodwill is not reversed for subsequent increases in the recoverable amount.
Assets held for sale [Policy Text Block]	(k) Assets held for sale: The Group classifies non-current assets, or disposal groups consisting of assets and liabilities, as held for sale when it expects to recover their carrying amounts primarily through sale rather than through continuing use. To meet criteria to be held for sale, the sale must be highly probable, and the assets or disposal groups must be available for immediate sale in their present condition. The Group must be committed to a plan to sell the assets or disposal group, and the sale should be expected to qualify for recognition as a completed sale within one year from the date of classification. The Group measures assets or disposal groups at the lower of their carrying amount and fair value less costs of disposal. Impairment losses on initial classification as held for sale and subsequent gains and losses on remeasurement are recognized in the consolidated income statements; however, gains are not recognized in excess of any cumulative impairment loss. Any impairment loss on a disposal group first is allocated to goodwill, and then to remaining assets and liabilities on pro rata basis, except that no loss is allocated to inventories, financial assets, deferred tax assets, employee benefit assets or investment property. Upon classifying assets or disposal groups as held for sale, the Group presents the assets separately as a single amount and the liabilities separately as a single amount on the consolidated balance sheets. When an asset no longer meets the criteria for classification as an asset held for sale, the Group records the asset at the lower of its recoverable amount and the carrying amount before the asset was classified as held for sale.
Pension and other employee benefits [Policy Text Block]	(l) Pension and other employee benefits: The Group has non-contributory and contributory defined benefit programs for the majority of its Canadian employees. The defined benefit pension benefits are based on years of service and final average salary for the salaried plans and are based on a flat dollar amount combined with years of service for the hourly plans. The Group provides non pension health and other post employment benefits to certain active employees and pensioners (post employment benefits) and also provides disability income, health benefits and other post employment benefits to hourly and salaried disabled employees (other long-term employee benefits). The Group accrues its obligations under the defined benefit plans as the employees render the services necessary to earn the pension and post employment benefits. The actuarial determination of the accrued benefit obligations for pensions and post employment benefits uses the projected benefit method prorated on service (which incorporates management's best estimate of future salary levels, other cost escalation, retirement ages of employees and other actuarial factors). For other long-term employee benefits, the Group recognizes the full cost of the benefit obligation at the time the employee becomes disabled. Actuarial advice is provided by external consultants. For the funded defined benefit plans, the Group recognizes the deficit or excess of the fair value of plan assets over the present value of the defined benefit obligation as a liability or an asset in the consolidated balance sheets. However, the Group recognizes an excess of assets only to the extent that it represents a future economic benefit which is available in the form of refunds from the plan or reductions in future contributions to the plan. When these criteria are not met, it is not recognized but is disclosed in the notes to the consolidated financial statements. Impacts of minimum funding requirements in relation to past service are considered when determining the balance sheet position. Defined benefit costs are categorized as follows: - Service costs (including current service cost, past service cost, as well as gains and losses on curtailments and settlements and administration costs), - Net interest expense or income, and - Remeasurement The first two components of defined benefit costs shown above are recognized in the consolidated income statements. Past service cost is recognized in the consolidated income statements in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset. Remeasurement, comprising actuarial gains and losses, the effect of changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in the consolidated balance sheets with a gain or loss recognised in OCI in the period in which they occur. Remeasurement recognised in OCI is reflected immediately in retained earnings and will not be reclassified to the consolidated income statements. For the other long-term employee benefits plan, remeasurments are recognized immediately in the consolidated income statements. Actuarial determinations used in estimating obligations relating to these plans incorporate assumptions using management's best estimates of factors including plan performance, salary escalation, retirement dates of employees and healthcare cost escalation rates. Due to the complexity of the valuation, the underlying assumptions and its long-term nature, a defined benefit obligation is highly sensitive to changes in these assumptions. All assumptions are reviewed at each reporting date. In determining the appropriate discount rate, management considers the interest rates on corporate bonds in the respective currency with at least an AA rating, with extrapolated maturities corresponding to the expected duration of the defined benefit obligation. The mortality rate is based on publicly available mortality tables for the specific country. Future salary increases and pension increases are based on expected future inflation rates for the respective country. The Group also has defined contribution plans providing pension benefits for certain of its salaried employees and certain of its US employees utilizing 401K plans. The Group recognizes the cost of the defined contribution plans based on the contributions required to be made during each period. Termination benefits are recognized as an expense when the Group is committed demonstrably, without realistic possibility of withdrawal, to a formal detailed plan to either terminate employment before the normal retirement date, or to provide termination benefits as a result of an offer made to encourage voluntary redundancy. Termination benefits for voluntary redundancies are recognized as an expense if the Group has made an offer of voluntary redundancy, it is probable that the offer will be accepted, and the number of acceptances can be estimated reliably. Benefits that are payable more than one year after the reporting period are discounted to their present value.
Provisions [Policy Text Block]	(m) Provisions: Provisions are recognized when the Group has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources will be required to settle the obligation, and a reliable estimate can be made. The provisions are recorded as management’s best estimate of the amount required to settle an obligation. Provisions are stated at their present value, which is determined by discounting the expected future cash flows at a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability. Decommissioning, restoration and similar liabilities Provisions are recorded for legal and constructive obligations associated with the future costs of rehabilitating the Group’s current and previous operating and development sites. Such costs are associated with decommissioning and restoration activities such as dismantling and removing structures, rehabilitating mines and tailings, and reclamation and re-vegetation of affected areas. The present value of estimated costs is recorded in the period in which the asset is installed or the environment is disturbed and a reasonable estimate of future costs and discount rates can be made. The provision is discounted using a risk-free rate, and estimates of future cash flows are adjusted to reflect risk. Subsequent to the initial measurement, the obligation is adjusted to reflect the passage of time and changes in the estimated future cash flows underlying the obligation. The increase in the provision due to the passage of time is recognized as finance expense, whereas increases and decreases due to changes in the estimated future cash flows, which are not the result of current inventory production, are capitalized and depreciated over the life of the related asset. Actual costs incurred upon settlement of the site restoration obligation are charged against the provision to the extent the provision was established for those costs. Upon settlement of the liability, a gain or loss may be recorded. For closed sites, changes to estimated costs are recognized immediately in the consolidated income statements within other operating expenses. The Group assesses the reasonableness of its estimates and assumptions each year and when conditions change and the estimates are revised accordingly. Judgement is required to determine the scope of future decommissioning and restoration activities, as well as such estimates and assumptions including discount rates, expected timing of decommissioning and restoration costs, inflationary factors and market risks. Changes in cost estimates, which may arise from changes in technology and pricing of the individual components of the cost may result in offsetting changes to the asset and liability and corresponding changes to the associated depreciation and finance costs. In view of the uncertainties concerning these future obligations, the ultimate timing and cost of reclamation and mine closure may differ materially from these estimates. If the change in estimate results in a significant increase in the decommissioning liability and therefore an addition to the carrying value of the asset, the Group considers whether this is an indication of impairment of the asset as a whole and, if so, tests for impairment in accordance with IAS 36, Impairment of Assets. In view of the uncertainties concerning environmental remediation, the ultimate cost of decommissioning and restoration liabilities could differ materially from the estimated amounts provided. The estimate of the total liability is subject to change based on amendments to laws and regulations and as new information concerning the Group's operations becomes available. Future changes, if any, to the estimated total liability as a result of amended requirements, laws, regulations and operating assumptions, as well as discount rates, may be significant and would be recognized prospectively as a change in accounting estimate, when applicable. Environmental laws and regulations are continually evolving in all regions in which the Group operates. The Group is not able to determine the impact, if any, of environmental laws and regulations that may be enacted in the future on its results of operations or financial position due to the uncertainty surrounding the ultimate form that such future laws and regulations may take. Onerous contracts A contract is considered to be onerous when the unavoidable costs of meeting obligations under the contract exceed the economic benefits expected to be received under it. The Group records a provision for any onerous contracts at the lesser of costs to comply with a contract and costs to terminate it. Restructuring provisions A provision for restructuring is recognized when management, with appropriate authority within the Group, has approved a detailed and formal restructuring plan, and the restructuring has either commenced or has been announced publicly. Future operating costs are not provided for.
Financial Instruments [Policy Text Block]	(n) Financial Instruments: Financial assets, financial liabilities, and non-financial derivative contracts are initially recognized at fair value plus, in the case of a financial asset or financial liability not at fair value through profit or loss, directly attributable transaction costs. Measurement in subsequent periods depends on the financial instrument’s classification. The Group uses trade date accounting for regular way purchases or sales of financial assets. The Group determines the classification of its financial instruments and non-financial derivatives at initial recognition. Financial assets and liabilities are offset and the net amount presented in the consolidated balance sheets when, and only when, the Group has a legal right to offset the amounts and intends either to settle on a net basis or to realize the asset and settle the liability simultaneously. (i) Non-derivative financial instruments – classification: Loans and receivables Loans and receivables are non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than those classified or designated as FVTPL or available-for-sale. Subsequent to initial recognition, loans and receivables are measured at amortized cost using the effective interest method, less any impairment losses. Gains and losses are recorded in the consolidated income statements when the loans and receivables are derecognized or impaired, and through the amortization process. Held-to-maturity investments Non-derivative financial assets with fixed or determinable payments and fixed maturity are classified as held-to-maturity when the Group has the positive intention and ability to hold to maturity, other than financial assets that meet the definition of loans and receivables or that are designated as FVTPL or available-for-sale. Subsequent to initial recognition, financial assets classified as held-to-maturity are held at amortized cost using the effective interest method, less any impairment losses. The Group does not currently have any financial assets classified as held-to-maturity. Available-for-sale financial assets Available-for-sale financial assets are non-derivative financial assets that are designated as available-for-sale or are not classified as loans and receivables, held-to-maturity, or FVTPL. Subsequent to initial recognition, available-for-sale financial assets are measured at fair value. Gains and losses are recorded in OCI and presented in equity within the available-for-sale reserve, with the exception of impairment losses, which are immediately recognized in the consolidated income statements. When available-for-sale assets are derecognized or determined to be impaired, the cumulative gain or loss previously recognized in the available-for-sale reserve is transferred to the consolidated income statements. The Group has classified investments in shares of Canadian metals and mining companies as available-for-sale assets. Financial assets and financial liabilities at fair value through profit or loss Financial assets and financial liabilities at FVTPL consist of those classified as held-for-trading and those designated as FVTPL on initial recognition. Financial instruments are classified as held-for-trading if they are acquired for the purpose of selling or repurchasing in the near term or if they are derivatives that are not designated in effective hedging relationships. Upon initial recognition, transaction costs are recognized in the consolidated income statements as incurred. Financial assets and financial liabilities at FVTPL are measured at fair value, and changes in fair value are recognized in other finance gains and losses except gains and losses on the non-hedge financial derivatives related to customer sales contracts are presented in revenue. The Group’s FVTPL category currently contains only derivatives and embedded derivatives. During the years ended December 31, 2017 and December 31, 2016, the Group’s financial assets and liabilities at FVTPL consisted of derivatives, embedded derivatives and investments in warrants classified as held-for-trading; the Group did not have any financial assets or liabilities designated as FVTPL on initial recognition. Financial liabilities at amortized cost Subsequent to initial recognition, the Group measures financial liabilities, other than those at FVTPL and those that are derivatives in designated hedging relationships, at amortized cost using the effective interest method. Gains and losses on derecognition are recognized in other finance gains and losses. (ii) Derivatives: Derivatives are initially recognized at fair value when the Group becomes a party to the derivative contract and are subsequently re-measured to fair value at the end of each reporting period. The resulting gain or loss is recognized in the consolidated income statements immediately unless the derivative is designated and effective as a hedging instrument. Derivatives with positive fair value are recognized as assets; derivatives with negative fair value are recognized as liabilities. Contracts to buy or sell non-financial items that meet the definition of a derivative but were entered into and are held in accordance with the Group's expected purchase, sale or usage requirements are not recognized as derivatives. Such contracts are recorded as non-derivative purchases and sales. (iii) Embedded derivatives: The Group considers whether a contract contains an embedded derivative when it becomes a party to the contract. Derivatives embedded in other financial instruments or other host contracts are treated as separate derivatives when their risks and characteristics are not closely related to those of the host contracts and the host contracts are not measured at FVTPL. (iv) Hedge accounting: The Group may use derivatives and non-derivative financial instruments to manage exposures to interest, currency, credit and other market risks. Where hedge accounting can be applied, a hedging relationship is designated as a fair value hedge, a cash flow hedge or a hedge of a net investment in a foreign operation. The purpose of hedge accounting is to ensure that gains, losses, revenue and expenses from effective hedging relationships are recorded in the consolidated income statements in the same period. At the inception of a hedge, the Group formally documents the hedging relationship and the risk management objective and strategy for undertaking the hedge. Such hedges are expected to be highly effective in achieving offsetting changes in fair value or cash flows. The Group tests effectiveness each period. In a cash flow hedging relationship, the effective portion of changes in the fair value of the hedging derivative is recognized in OCI and presented in the hedging reserve in equity. The gain or loss relating to the ineffective portion is recognized immediately in the consolidated income statements and is included in other finance gains and losses. Amounts previously recognized in OCI are reclassified to the consolidated income statements in the same periods as the hedged cash flows affect profit or loss and are presented on the same line of the consolidated income statements as the recognized hedged item. When the hedged item is a non-financial asset or liability, the amounts previously recognized in OCI are reclassified to the carrying amount of the non-financial asset or liability. Hedge accounting is discontinued prospectively if the hedging instrument is sold, terminated or exercised, if the hedge no longer meets criteria for hedge accounting, or if the Group revokes the hedge designation. In these cases, any gain or loss accumulated in equity (in the hedging reserve) remains in equity until the forecast transaction occurs, at which time it is reclassified to the consolidated income statements. If the forecast transaction is no longer expected to occur, any gain or loss accumulated in equity is reclassified immediately from equity to the consolidated income statements. (v) Fair values of financial instruments: The fair value of a financial instrument is the amount for which an asset could be exchanged, or a liability settled, between knowledgeable, willing parties in an arm’s-length transaction. Fair values of financial instruments traded in active markets are determined based on quoted market prices, where available. Bid prices are generally used for assets held or liabilities to be issued; asking prices are generally used for assets to be acquired or liabilities held. For financial instruments not traded in an active market, fair values are determined based on appropriate valuation techniques. Such techniques may include discounted cash flow analysis, using recent arm’s-length market transactions, reference to the current fair value of another instrument that is substantially the same, and other valuation models. The Group applies a hierarchy to classify valuation methods used to measure financial instruments carried at fair value. Levels 1 to 3 are defined based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value, as follows: - Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities; - Level 2: Valuation techniques use significant observable inputs, either directly (i.e., as prices) or indirectly (i.e., derived from prices), or valuations are based on quoted prices for similar instruments; and - Level 3: Valuation techniques use significant inputs that are not based on observable market data (unobservable inputs). An analysis of fair values of financial instruments is provided in note 26. (vi) Impairment of financial instruments: Each reporting date, the Group assesses financial assets not carried at FVTPL to determine whether there is objective evidence of impairment. A financial asset or group of financial assets is impaired if objective evidence indicates that one or more events occurred after initial recognition of the asset that negatively affected the estimated future cash flows of the financial asset or group of financial assets. Objective evidence that financial assets are impaired can include significant financial difficulty of the issuer or debtor, default or delinquency in interest or principal payments, restructuring of an amount due to the Group on terms that the Group would not consider otherwise, indications that a debtor or issuer will enter bankruptcy, or the disappearance of an active market for a security. For an investment in an equity security, a significant or prolonged decline in the fair value of the security below its cost is also objective evidence of impairment. Significant decline is defined as 20% of the security’s cost base and prolonged is defined as three consecutive quarters. Impairment of financial assets carried at amortized cost: The Group considers evidence of impairment for loans and receivables and any held-to-maturity investments at both a specific asset and collective level. First, the Group specifically assesses financial assets that are individually significant and groups of financial assets that are not individually significant. If evidence of impairment is not identified in the specific assessment, the Group then combines assets based on similar credit risk characteristics (excluding any assets that were specifically determined to be impaired) and collectively assesses them for impairment. Objective evidence of impairment for a portfolio of receivables could include the Group’s past experience of collecting payments, an increase in the number of delayed payments in the portfolio past the average credit period, as well as observable changes in national or local economic conditions that correlate with default on receivables. If there is objective evidence that an impairment loss has been incurred, the Group measures the amount of the loss as the difference between the asset’s carrying amount and the present value of estimated future cash flows (excluding future expected credit losses that have not yet been incurred), discounted at the financial asset’s original effective interest rate. In the case of collateralized financial assets, the Group measures the amount of the loss as the difference between the asset’s carrying amount and the greater of the present value of estimated future cash flows (excluding future expected credit losses that have not yet been incurred), discounted at the financial asset’s original effective interest rate and the cash flows that may result from foreclosure less costs for obtaining and selling the collateral, whether or not foreclosure is probable. The Group recognizes any impairment loss in the consolidated income statements and reduces the carrying amount of the financial asset using an allowance account, unless the Group is satisfied that no recovery of the amount owing is possible; at that point amounts are considered unrecoverable and are written off against the financial asset directly. If, in a subsequent year, the amount of the estimated impairment loss decreases as a result of an event occurring after the impairment was recognized, the Group reverses all or a portion of the previously recognized impairment loss by adjusting the asset carrying value or the allowance account and recognizing the reversal in the consolidated income statements in other finance gains and losses. Impairment of available-for-sale financial assets: Impairment losses on available-for-sale investments are recognized by transferring the cumulative loss that has been recognized in OCI (and presented in the available-for-sale reserve in equity) to the consolidated income statements. The amount of the impairment loss is the difference between the investment’s acquisition costs, net of any principal repayments, and its current fair value, less any impairment loss previously recognized in the consolidated income statements. Impairment losses recognized in the consolidated income statements related to available-for-sale equity investments are not subsequently reversed. Any subsequent increases in fair value of the equity investments are recognized in OCI. However, impairment losses recognized related to available-for-sale debt instruments are subsequently reversed, in whole or in part, if the fair value of the debt instrument increases as a result of an event occurring after the impairment loss was recognized, and the amount of the reversal is recognized in the consolidated income statements in other finance gains and losses. The Group presents impairment losses and reversals of impairment losses recognized in the consolidated income statements in other finance gains and losses. (vii) Derecognition of financial instruments: The Group derecognizes financial assets when the contractual rights to the cash flows from the assets expire, or when the Group transfers the rights to receive the contractual cash flows on the financial assets in a transaction in which substantially all the risks and rewards of ownership of the financial asset are transferred. Any interest in transferred financial assets that is created or retained by the Group is recognized as a separate asset or liability. The Group derecognizes financial liabilities when its contractual obligations are discharged, cancelled or expire.
Taxation [Policy Text Block]	(o) Taxation: Current Tax Current income tax assets and liabilities for the current and prior periods are measured at the amount expected to be recovered from or paid to the taxation authorities. The tax rates and tax laws used to compute the amount are those that are enacted or substantively enacted by the balance sheet date. Hudbay is subject to income taxes in numerous jurisdictions. Significant judgement is required in determining the worldwide provision for income taxes due to the complexity of legislation. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. The Group recognizes liabilities for anticipated tax issues based on estimates of whether additional taxes will be due. Where the final tax outcome of these matters is different from the amounts that were initially recorded, such differences will affect the income tax and deferred tax provisions in the period in which such determination is made. Additionally, future changes in tax laws in the jurisdictions in which the Group operates could limit the ability of the Group to obtain tax deductions in future periods. Deferred Tax Deferred tax is recognized using the balance sheet method in respect of temporary differences at the balance sheet date between the tax basis of assets and liabilities, and their carrying amounts for financial reporting purposes. Deferred income tax liabilities are recognized for all taxable temporary differences, except: - where the deferred income tax liability arises from the initial recognition of goodwill, or the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss; and - in respect of taxable temporary differences associated with investments in subsidiaries, associates and interests in joint ventures, where the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future. Deferred income tax assets are recognized for all deductible temporary differences, carry-forward of unused tax assets and unused tax losses, to the extent that it is probable that taxable profit will be available against which the deductible temporary differences, and the carry-forward of unused tax assets and unused tax losses can be utilized, except: - where the deferred income tax asset relating to the deductible temporary difference arises from the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss; and - in respect of deductible temporary differences associated with investments in subsidiaries, associates and interests in joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available against which the temporary differences can be utilized. To the extent that it is probable that taxable profit will be available to offset the deductible temporary differences, the Group recognizes the deferred tax asset regarding the temporary difference on decommissioning, restoration and similar liabilities and recognizes the corresponding deferred tax liability regarding the temporary difference on the related assets. The carrying amount of deferred income tax assets is reviewed at each balance sheet date and reduced to the extent that it is no longer probable that sufficient taxable profit will be available to allow all or part of the deferred income tax asset to be utilized. Unrecognized deferred income tax assets are reassessed at each balance sheet date and are recognized to the extent that it has become probable that future taxable profit will be available to allow the deferred tax asset to be recovered. Judgement is required in determining whether deferred tax assets are recognized on the consolidated balance sheets. Deferred tax assets, including those arising from unutilized tax losses, require management to assess the likelihood of taxable profit in future periods in order to utilize recognized deferred tax assets. Estimates of future taxable income are based on forecast cash flows from operations and the application of existing tax laws in each jurisdiction. To the extent that future cash flows and taxable income differ significantly from estimates, the ability to realize the net deferred tax assets recorded at the balance sheet date could be affected. Deferred tax is measured on an undiscounted basis at the tax rates that are expected to apply in the periods in which the asset is realized or the liability is settled, based on tax rates and tax laws enacted or substantively enacted at the balance sheet date. Deferred income tax assets and deferred income tax liabilities are offset if a legally enforceable right exists to offset current tax assets against current tax liabilities and the deferred income taxes relate to the same taxable entity and the same taxation authority. Current and deferred taxes relating to items recognized outside profit or loss (whether in other comprehensive income or directly in equity) are recognized outside profit or loss and not in the consolidated income statements. Mining taxes and royalties are treated and disclosed as current and deferred taxes if they have the characteristics of an income tax.
Share capital and reserves [Policy Text Block]	(p) Share capital and reserves: Transaction costs Transaction costs directly attributable to equity transactions are recognized as a deduction from equity. Other capital reserve The other capital reserve is used for equity-settled share-based payments and includes amounts for stock options granted and not exercised. Foreign currency translation reserve The foreign currency translation reserve is used to record exchange differences arising from the translation of the financial statements of foreign operations. Exchange differences arising from the translation of the financial statements of foreign operations form part of the net investment in the foreign operation. Translation gains and losses remain in the reserve until disposal of all or a portion of the foreign operation. Available-for-sale reserve The available-for-sale reserve contains the cumulative change in the fair value of available-for-sale investments with the exception of impairment losses and foreign currency differences on monetary available-for-sale assets. Gains and losses are reclassified to the consolidated income statements when the available-for-sale investments are impaired or derecognized.
Share-based payments [Policy Text Block]	(q) Share-based payments: Hudbay offers a Deferred Share Unit ("DSU") plan for non-employee members of the Board of Directors and a Restricted Share Unit (“RSU”) plan for employees. Hudbay also has options outstanding under a stock option plan. These plans are included in provisions on the consolidated balance sheets and further described in note 23. Changes in the fair value of the liabilities are recorded in the consolidated income statements. Cash-settled transactions, consisting of DSUs and RSUs, are initially measured at fair value and recognized as an obligation at the grant date. The liabilities are remeasured to fair value at each reporting date up to and including the settlement date, with changes in fair value recognized in the consolidated income statements. The Group values the liabilities based on the change in the Company's share price. Additional DSUs and RSUs are credited to reflect dividends paid on Hudbay common shares over the vesting period. The current portion of the liability reflects those grants that have vested or that are expected to vest within twelve months. DSUs vest on the grant date and are redeemable when a participant is no longer a member of the Board of Directors. Issue and redemption prices of DSUs are based on the average closing price of the Company's common shares for the five trading days prior to issuance or redemption. RSUs are generally issued under Hudbay’s Long Term Equity Plan (“LTEP Plan”) and vest on or before December 31st of the third calendar year after the year in which the services corresponding to such share unit award were performed. RSUs granted under the LTEP Plan may be settled in the form of Hudbay common shares or, at the option of Hudbay, the cash equivalent based on the market price of the common shares as of the vesting date. Hudbay has historically settled RSUs in cash. Except in specified circumstances, RSUs terminate when an employee ceases to be employed by the Group. Valuations of RSUs reflect estimated forfeitures. Equity-settled transactions with employees relate to stock options and are measured by reference to the fair value at the earlier of the grant date and the date that the employees unconditionally became entitled to the awards. Fair value is determined using a Black-Scholes option pricing model, which relies on estimates of the future risk-free interest rate, future dividend payments, future share price volatility and the expected average life of the options. The Group believes this model adequately captures the substantive features of the option awards and is appropriate to calculate their fair values. The fair value determined at the grant date is recognized over the vesting period in accordance with vesting terms and conditions, with a corresponding increase to other capital reserves. The amount recognized as an expense is adjusted to reflect the number of awards for which the related service and non-market vesting conditions are expected to be met.
Earnings per share [Policy Text Block]	(r) Earnings per share: The Company presents basic and diluted earnings (loss) per share (“EPS”) data for its common shares. Basic EPS is calculated by dividing the profit or loss attributable to common shareholders of the Company by the weighted average number of common shares outstanding during the period. Diluted EPS is determined by adjusting the profit or loss attributable to common shareholders and the weighted average number of common shares outstanding for the effects of all dilutive potential common shares, which currently consist of stock options granted to employees and warrants. When calculating earnings per share for periods where the Group has a loss, Hudbay's calculation of diluted earnings per share excludes any incremental shares from the assumed conversion of stock options as they would be anti-dilutive.
Leases [Policy Text Block]	(s) Leases: Finance leases, under which substantially all the risks and rewards incidental to ownership of the leased item are transferred to the Group, are capitalized as assets at the inception of the lease at the lower of fair value or the present value of the minimum lease payments. Lease payments are apportioned between finance charges and the reduction of the liability so as to achieve a constant periodic rate of interest on the remaining balance of the liability. Finance charges are reflected in the consolidated income statements as finance costs. Under operating lease arrangements, the risks and rewards incidental to ownership are not transferred to the Group. Operating lease payments are recognized as an expense in the consolidated income statements on a straight-line basis over the lease term.
Segment reporting [Policy Text Block]	(t) Segment reporting: An operating segment is a component of the Group that engages in business activities from which it may earn revenue and incur expenses and for which discrete financial information is available. The Group’s chief executive officer regularly reviews the operating results of each operating segment to make decisions about resources to be allocated to the segment and assess its performance. In determining operating segments, the Group considers location and decision-making authorities. Refer to note 30.
Statements of cash flows [Policy Text Block]	(u) Statements of cash flows: The Group presents interest paid and dividends paid as financing activities, except if the interest is related to capitalized borrowing costs, and interest received is presented as an investing activity in the consolidated statements of cash flow. The Group presents the consolidated statements of cash flows using the indirect method.

Significant accounting polici38

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about estimated useful life or depreciation rate explanatory [Table Text Block]	— Capital works in progress - not depreciated — Mining properties - unit-of-production — Mining assets - unit-of-production — Plant and Equipment — Equipment - straight-line over 1 to 21 years — Other plant assets - straight-line over 1 to 21 years / unit of production

Revenue and expenses (Tables)

Revenue and expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about revenue [Table Text Block]	Year ended December 31, 2017 2016 Copper $ 925,074 $ 835,470 Zinc 352,941 236,971 Gold 130,837 119,792 Silver 45,793 52,108 Other 13,974 2,719 1,468,619 1,247,060 Treatment and refining charges (106,066 ) (118,382 ) $ 1,362,553 $ 1,128,678
Disclosure of depreciation and amortization expense [Table Text Block]	Year ended December 31, 2017 2016 Cost of sales $ 292,880 $ 298,630 Selling and administrative expenses 355 504 $ 293,235 $ 299,134
Disclosure of detailed information about share-based payment expenses (recoveries) [Table Text Block]	Cash-settled Total share-based RSUs DSUs payment expense Year ended December 31, 2017 Cost of sales $ 1,946 $ - $ 1,946 Selling and administrative expenses 9,667 2,982 12,649 Other operating expenses 1,324 - 1,324 $ 12,937 $ 2,982 $ 15,919 Year ended December 31, 2016 Cost of sales $ 860 $ - $ 860 Selling and administrative expenses 6,452 2,111 8,563 Other operating expenses 464 - 464 $ 7,776 $ 2,111 $ 9,887
Disclosure of detailed information about employee benefits expense [Table Text Block]	Year ended December 31, 2017 2016 Current employee benefits $ 147,760 $ 136,299 Profit-sharing plan expense 19,757 5,064 Share-based payments (notes 5c, 18, 23) Cash-settled restricted share units 12,937 7,776 Cash-settled deferred share units 2,982 2,111 Employee share purchase plan 1,328 1,303 Post-employment pension benefits Defined benefit plans 10,132 12,121 Defined contribution plans 2,443 1,061 Past service costs 10,442 - Other post-retirement employee benefits 7,250 7,406 Termination benefits 419 1,810 $ 215,450 $ 174,951
Disclosure of other operating expense [Table Text Block]	Year ended December 31, 2017 2016 Regional costs $ 4,308 $ 4,388 Constancia insurance recovery (12,857 ) - Realized gain on contingent consideration of Balmat (6,400 ) Other expenses 2,509 6,198 $ (12,440 ) $ 10,586
Disclosure of finance cost (income) [Table Text Block]	Year ended December 31, 2017 2016 Finance income $ (2,849 ) $ (2,792 ) Finance expense Interest expense on long-term debt 87,819 108,767 Accretion on financial liabilities at amortized cost 1,302 1,316 Unwinding of discounts on provisions 4,159 2,586 Tender premium on 9.50% senior unsecured notes - 47,718 Withholding taxes 9,641 10,083 Other finance expense 13,256 11,306 116,177 181,776 Interest capitalized (13,149 ) (14,705 ) 103,028 167,071 Other finance losses (gains) Net foreign exchange loss (gain) 15,772 (489 ) Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants (1,051 ) 2,111 Embedded derivatives 1,790 (1,238 ) Investments classified as held-for-trading (80 ) (119 ) Reclassified from other comprehensive income on disposal of available-for-sale investments (89 ) (1,475 ) Reclassified from other comprehensive income on impairment of available-for-sale investments 2,059 1,102 18,401 (108 ) Net finance expense $ 118,580 $ 164,171
Disclosure of detailed information about impairment loss by segment [Table Text Block]	Manitoba Pre-tax impairment to: Property, plant & equipment (note 11) $ 11,320 Tax impact - (recovery) (3,849 ) After-tax impairment charge $ 7,471

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about cash and cash equivalents explanatory [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Cash on hand and demand deposits $ 356,499 $ 129,850 Short-term money market instruments with maturities of three months or less at acquisition date - 17,014 $ 356,499 $ 146,864

Trade and other receivables (Ta

Trade and other receivables (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about trade and other receivables explanatory [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current Trade receivables $ 119,055 $ 85,386 Embedded derivatives - provisional pricing (note 26c) 17,427 12,538 Statutory receivables 13,961 43,808 Receivable from joint venture partners 2,808 - Other receivables 2,271 10,835 155,522 152,567 Non-current Taxes receivable 14,394 12,424 Receivable from joint venture partners 16,414 18,681 Other receivables 1,651 1,543 32,459 32,648 $ 187,981 $ 185,215

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about inventories [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current Stockpile $ 13,468 $ 9,368 Work in progress 1 14,552 9,100 Finished goods 71,906 54,583 Materials and supplies 41,756 39,413 141,682 112,464 Non-current Materials and supplies 5,809 4,537 $ 147,491 117,001

Other financial assets (Tables)

Other financial assets (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of other financial assets [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current Derivative assets $ 2,841 $ 3,397 Non-current Available-for-sale investments 21,973 13,508 Investments at fair value through profit or loss 282 192 Restricted cash (note 26d) 206 17,148 22,461 30,848 $ 25,302 $ 34,245
Disclosure of available-for-sale financial assets [text block] [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Balance, beginning of year $ 13,508 $ 9,206 Additions 5,265 2,857 Increase from remeasurement to fair value 2,507 3,598 Disposals (229 ) (2,206 ) Effect of movements in exchange rates 922 53 Balance, end of year $ 21,973 $ 13,508

Intangible assets - computer 44

Intangible assets - computer software (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about intangible assets [text block] [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Cost Balance, beginning of year $ 16,998 $ 16,179 Additions 1,203 407 Effects of movement in exchange rates 968 412 Balance, end of year 19,169 16,998 Accumulated amortization Balance, beginning of year 10,384 7,320 Amortization for the year 2,541 2,882 Effects of movement in exchange rates 669 182 Balance, end of year 13,594 10,384 Net book value $ 5,575 $ 6,614

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Disclosure of detailed information about property, plant and equipment [Table Text Block]	Exploration and Capital evaluation works in Mining Plant and Dec. 31, 2017 assets progress properties equipment Total Cost Balance, beginning of year $ 15,015 $ 844,759 $ 1,775,432 $ 2,368,658 $ 5,003,864 Additions 7,000 156,807 - 26,830 190,637 Capitalized stripping and development - - 69,178 - 69,178 Decommissioning and restoration - 51 5,509 5,101 10,661 Interest capitalized - 13,149 - - 13,149 Transfers and other movements - (79,671 ) - 79,671 - Impairment - (11,320 ) - - (11,320 ) Disposals - (13 ) (1,600 ) (9,586 ) (11,199 ) Effects of movement in exchange rates 995 2,955 49,184 47,553 100,687 Other - 6,814 85 455 7,354 Balance, end of year 23,010 933,531 1,897,788 2,518,682 5,373,011 Accumulated depreciation Balance, beginning of year - - 523,460 614,581 1,138,041 Depreciation for the year - - 118,754 182,552 301,306 Disposals - - - (7,540 ) (7,540 ) Effects of movement in exchange rates - - 31,516 28,741 60,257 Other - - (19 ) 72 53 Balance, end of year - - 673,711 818,406 1,492,117 Net book value $ 23,010 $ 933,531 $ 1,224,077 $ 1,700,276 $ 3,880,894	Exploration and Capital evaluation works in Mining Plant and Dec. 31, 2016 assets progress properties equipment Total Cost Balance, beginning of year $ 14,650 $ 812,618 $ 1,603,952 $ 2,289,556 $ 4,720,776 Additions - 87,505 45,383 15,445 148,333 Capitalized stripping and development - 19,666 48,886 - 68,552 Decommissioning and restoration - (46 ) 1,966 23,036 24,956 Interest capitalized - 14,705 - - 14,705 Transfers and other movements - (89,506 ) 56,848 32,658 - Disposals - (1,501 ) - (11,089 ) (12,590 ) Effects of movement in exchange rates 365 1,334 18,382 18,897 38,978 Other - (16 ) 15 155 154 Balance, end of year 15,015 844,759 1,775,432 2,368,658 5,003,864 Accumulated depreciation Balance, beginning of year - - 394,098 436,402 830,500 Depreciation for the year - - 119,420 178,175 297,595 Disposals - - - (9,160 ) (9,160 ) Effects of movement in exchange rates - - 9,810 9,076 18,886 Other - - 132 88 220 Balance, end of year - - 523,460 614,581 1,138,041 Net book value $ 15,015 $ 844,759 $ 1,251,972 $ 1,754,077 $ 3,865,823

Trade and other payables (Table

Trade and other payables (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about trade and other payables explanatory [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Trade payables $ 71,336 $ 80,509 Accruals and payables 86,078 78,154 Accrued interest 34,848 4,300 Exploration and evaluation payables 186 64 Embedded derivatives - provisional pricing (note 26c) 373 86 Statutory payables 6,296 6,549 $ 199,117 $ 169,662

Other liabilities (Tables)

Other liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of other current liabilities [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current Provisions (note 18) $ 27,370 $ 14,367 Pension liability (note 19) 19,401 24,635 Other employee benefits (note 20) 2,756 2,356 Unearned revenue 2,435 849 $ 51,962 $ 42,207

Other financial liabilities (Ta

Other financial liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about other financial liabilities explanatory [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current Derivative liabilities $ 16,140 $ 10,682 Warrants at fair value through profit and loss 6,961 - Contingent consideration - gold price option 732 - Other financial liabilities at amortized cost 2,360 2,813 Embedded derivatives 297 - 26,760 13,495 Non-current Contingent consideration - gold price option - 570 Warrants at fair value through profit and loss - 7,588 Other financial liabilities at amortized cost 19,938 20,185 Embedded derivatives 863 - 20,801 28,343 $ 47,561 $ 41,838

Finance lease obligations (Tabl

Finance lease obligations (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of additional information about leasing activities for lessee [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Total minimum lease payments $ 89,750 $ 13,720 Effect of discounting (5,177 ) (788 ) Present value of minimum lease payments 84,573 12,932 Less: current portion (18,327 ) (3,172 ) 66,246 9,760 Minimum payments under finance leases Less than 12 months 20,186 3,508 13-36 months 40,253 6,667 37-60 months 29,311 3,545 More than 60 months - - $ 89,750 $ 13,720

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of borrowings [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Senior unsecured notes (a) $ 987,903 $ 986,574 Equipment finance facility (b) - 50,267 Senior secured revolving credit facilities (c) - 202,075 Less: Unamortized transaction costs - revolving credit facilities (d) (8,328 ) (6,752 ) 979,575 1,232,164 Less: current portion - (16,490 ) $ 979,575 $ 1,215,674
Senior secured revolving credit facilities [Member]
Statement [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2016 $ 297,075 Addition to Principal, net of transaction costs 65,000 Payments made (160,000 ) Balance, December 31, 2016 $ 202,075 Addition to Principal 25,000 Payments made (227,075 ) Balance, December 31, 2017 $ -
Equipment finance facility [Member]
Statement [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2016 $ 66,521 Transaction costs (1,013 ) Payments made (16,490 ) Accretion of transaction costs 1,249 Balance, December 31, 2016 $ 50,267 Transaction costs (326 ) Payments made (54,364 ) Write-down of unamortized transaction costs 3,552 Accretion of transaction costs 871 Balance, December 31, 2017 $ -
Disclosure of borrowings [Table Text Block]	Dec. 31, Dec. 31, 2017 2016 Current $ - $ 16,490 Non-current - 33,777 $ - $ 50,267
Senior unsecured notes [Member]
Statement [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2016 $ 917,329 Addition to Principal, net of transaction costs 987,671 Payments made (920,000 ) Change in fair value of embedded derivative (prepayment option) (1,146 ) Write-down of unamortized transaction costs 2,216 Accretion of transaction costs and premiums 504 Balance, December 31, 2016 $ 986,574 Transaction costs (133 ) Change in fair value of embedded derivative (prepayment option) 450 Accretion of transaction costs and premiums 1,012 Balance, December 31, 2017 $ 987,903
Unamortized transaction costs - revolving credit facilities [Member]
Statement [Line Items]
Disclosure of detailed information about unamortized transaction costs - revolving credit facilities [Table Text Block]	Balance, January 1, 2016 $ 6,045 Accretion of transaction costs (4,272 ) New transaction costs 4,979 Balance, December 31, 2016 $ 6,752 Accretion of transaction costs (3,291 ) New transaction costs 4,867 Balance, December 31, 2017 $ 8,328

Deferred revenue (Tables)

Deferred revenue (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of changes in deferred revenue [Table Text Block]	Balance, January 1, 2016 $ 597,260 Recognition of revenue (65,762 ) Effects of changes in foreign exchange 6,354 Balance, December 31, 2016 $ 537,852 Recognition of revenue (48,958 ) Effects of changes in foreign exchange 9,150 Balance, December 31, 2017 $ 498,044
Disclosure of detailed information about deferred revenue [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current $ 49,907 $ 65,619 Non-current 448,137 472,233 $ 498,044 $ 537,852

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Disclosure of changes in provisions [Table Text Block]	Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 liabilities (note 23a ) (note 23a ) Other Total Balance, January 1, 2017 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069 Net additional provisions made 6,485 868 7,327 202 14,882 Amounts used (69 ) (638 ) (5,491 ) (937 ) (7,135 ) Unwinding of discount (note 5f) 4,159 - - - 4,159 Effect of change in discount rate 2,658 - - - 2,658 Effect of foreign exchange 9,512 346 1,194 95 11,147 Effect of change in share price - 2,114 5,327 287 7,728 Balance, December 31, 2017 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508	Decommis- sioning, restoration Deferred Restricted and similar share units share units liabilities (note 23a ) (note 23a ) 1 Other Total Balance, January 1, 2016 $ 147,035 $ 2,803 $ 4,388 $ - $ 154,226 Net additional provisions made 30,038 1,018 6,348 1,922 39,326 Amounts used (894 ) (1,078 ) (2,736 ) (430 ) (5,138 ) Unwinding of discount (note 5f) 2,586 - - - 2,586 Effect of change in discount rate (4,189 ) - - - (4,189 ) Effect of foreign exchange 2,720 97 (47 ) 20 2,790 Effect of change in share price - 1,093 3,099 276 4,468 Balance, December 31, 2016 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069
Disclosure of detailed information about provisions [Table Text Block]	Current (note 13) $ 2,344 $ 6,623 $ 17,119 $ 1,284 $ 27,370 Non-current 197,697 - 2,290 151 200,138 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508	Current (note 13) $ 1,054 $ 3,933 $ 8,451 $ 929 $ 14,367 Non-current 176,242 - 2,601 859 179,702 $ 177,296 $ 3,933 $ 11,052 $ 1,788 $ 194,069

Pension obligations (Tables)

Pension obligations (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of additional information about defined benefit plans [Table Text Block]	Year ended December 31, 2017 2016 Opening defined benefit obligation $ 349,165 $ 337,004 Current service cost 10,707 10,768 Past service cost related to the new collective bargaining agreement 10,442 - Interest cost 12,602 13,415 Benefits paid from plan (33,721 ) (32,644 ) Benefits paid from employer (999 ) (1,424 ) Participant contributions 93 93 Effects of movements in exchange rates 24,440 10,348 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions 1,598 - Arising from changes in financial assumptions 9,402 14,955 Arising from experience adjustments (675 ) (3,350 ) Closing defined benefit obligation $ 383,054 $ 349,165
Disclosure of additional information about defined benefit plans, balance by member group [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Active members $ 250,965 $ 235,815 Deferred members 4,304 3,636 Retired members 127,785 109,714 Closing defined benefit obligation $ 383,054 $ 349,165
Disclosure of changes in fair value of plan assets [Table Text Block]	Year ended December 31, 2017 2016 Opening fair value of plan assets: $ 296,151 $ 279,523 Interest income 11,005 11,634 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) 24,437 2,905 Contributions from the employer 22,484 26,198 Employer direct benefit payments 999 1,424 Contributions from plan participants 93 93 Benefit payment from employer (999 ) (1,424 ) Administrative expenses paid from plan assets (80 ) (77 ) Benefits paid (33,721 ) (32,644 ) Effects of changes in foreign exchange rates 21,063 8,519 Closing fair value of plan assets $ 341,432 $ 296,151
Disclosure of net defined benefit liability (asset) [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Present value of funded defined benefit obligation $ 365,655 $ 333,720 Fair value of plan assets (341,432 ) (296,151 ) Present value of unfunded defined benefit obligation 17,399 15,445 Net liability arising from defined benefit obligation $ 41,622 $ 53,014
Disclosure of detailed information about pension obligation [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Pension obligation - current (note 13) $ 19,401 $ 24,635 Pension obligation - non-current 22,221 28,379 Total pension obligation $ 41,622 $ 53,014
Disclosure of detailed information about pension expense [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Service costs: Current service cost $ 10,707 $ 10,768 Past service cost and loss from settlements 10,442 - Total service cost 21,149 10,768 Net interest expense 1,597 1,781 Administration cost 80 77 Defined benefit pension expense $ 22,826 $ 12,626 Defined contribution pension expense $ 908 $ 829
Disclosure of detailed information about remeasurement on the net defined benefit liability [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ (24,437 ) $ (2,905 ) Actuarial gains arising from changes in demographic assumptions 1,598 - Actuarial losses/(gains) arising from changes in financial assumptions 9,402 14,955 Actuarial gains arising from experience adjustments (675 ) (3,350 ) Defined benefit loss/(gain) related to remeasurement $ (14,112 ) $ 8,700 Total pension cost $ 9,622 $ 22,155
Disclosure of defined benefit plan, assumptions used [Table Text Block]	2017 2016 Defined benefit cost: Discount rate - benefit obligations 3.69 % 4.08% Discount rate - service cost 3.82 % 4.25% Expected rate of salary increase 1 2.75 % 3.00% Average longevity at retirement age for current pensioners (years) 2 Males 20.9 20.8 Females 23.3 23.3 2017 2016 Defined benefit obligation: Discount rate 3.45 % 3.69% Expected rate of salary increase 1 2.75 % 2.75% Average longevity at retirement age for current pensioners (years) 2 Males 21.0 20.9 Females 23.7 23.3 Average longevity at retirement age for current employees (future pensioners) (years) 2: Males 22.9 22.2 Females 25.5 24.5
Disclosure of fair value of plan assets [Table Text Block]	December 31, 2017 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 4,625 $ - $ - $ 4,625 Pooled equity funds 116,027 - - 116,027 Pooled fixed income funds - 189,964 - 189,964 Alternative investment funds - 30,699 - 30,699 Balanced funds - 117 - 117 $ 120,652 $ 220,780 $ - $ 341,432 December 31, 2016 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 4,515 $ - $ - $ 4,515 Pooled equity funds 121,103 - - 121,103 Pooled fixed income funds - 143,489 - 143,489 Alternative investment funds - 26,404 - 26,404 Balanced funds - 640 - 640 $ 125,618 $ 170,533 $ - $ 296,151

Other employee benefits (Tables

Other employee benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of additional information about other employee benefit plans [Table Text Block]	Year ended December 31, 2017 2016 Opening defined benefit obligation $ 89,005 $ 80,259 Current service cost 1 2,614 2,579 Interest cost 3,567 3,367 Effects of movements in exchange rates 7,026 2,197 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions 1,172 - Arising from changes in financial assumptions 6,761 2,712 Arising from experience adjustments (120 ) (160 ) Benefits paid (2,196 ) (1,949 ) Closing defined benefit obligation $ 107,829 $ 89,005
Disclosure of additional information about other employee benefit plans, balance by member group [Table Text Block]	Dec 31, 2017 Dec 31, 2016 Active members $ 64,460 $ 52,611 Inactive members 43,369 36,394 Closing defined benefit obligation $ 107,829 $ 89,005
Disclosure of changes in fair value of assets of other employee benefits plan [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Employer contributions $ 2,196 $ 1,949 Benefits paid (2,196 ) (1,949 ) Closing fair value of assets $ - $ -
Disclosure of net benefit liability for other employee benefits [Table Text Block]	Dec. 31, Dec. 31, 2017 2016 Unfunded benefit obligation $ 107,829 $ 89,005 Vacation accrual and other - non-current 3,324 2,624 Net liability $ 111,153 $ 91,629
Disclosure of detailed information about other employee benefits plan [Table Text Block]	Dec. 31, Dec. 31, 2017 2016 Other employee benefits liability - current (note 13) $ 2,756 $ 2,356 Other employee benefits liability - non-current 108,397 89,273 Net liability $ 111,153 $ 91,629
Disclosure of detailed information about employee future benefit expense [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Current service cost 1 $ 2,614 $ 2,579 Net interest cost 3,567 3,367 Components recognized in consolidated income statements $ 6,181 $ 5,946
Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ 1,172 $ - Actuarial (gains)/losses arising from changes in financial assumptions 6,761 2,712 Actuarial gains arising from changes experience adjustments (120 ) (160 ) Components recognized in statements of comprehensive income $ 7,813 $ 2,552 Total other employee future benefit cost $ 13,994 $ 8,498
Disclosure of other employee benefit plan, assumptions used [Table Text Block]	2017 2016 Defined benefit cost: Discount rate 4.03 % 4.19% Initial weighted average health care trend rate 6.13 % 6.28% Ultimate weighted average health care trend rate 4.00 % 4.00% Average longevity at retirement age for current pensioners (years) 1 Males 21.6 21.6 Females 24.1 24.0 2017 2016 Defined benefit obligation: Discount rate 3.64 % 4.03% Initial weighted average health care trend rate 5.97 % 6.13% Ultimate weighted average health care trend rate 4.00 % 4.00% Average longevity at retirement age for current pensioners (years): Males 21.0 21.6 Females 23.7 24.1 Average longevity at retirement age for current employees (future pensioners) (years): Males 22.9 23.0 Females 25.5 25.3

Income and mining taxes (Tables

Income and mining taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about effective income tax expense recovery [Table Text Block]	Year ended December 31, 2017 2016 Current: Income taxes Canada $ 5,970 $ 7,000 Peru 24,523 - Mining Taxes Canada 4,744 1,309 Peru 14,706 8,971 49,943 17,280 Deferred: Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences Canada 2,636 (24,013 ) Peru 30,721 39,350 United States (46,908 ) 5,617 Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary differences Canada 467 3,739 Peru (613 ) (1,441 ) Adjustments in respect of prior years (1,417 ) 266 (15,114 ) 23,518 $ 34,829 $ 40,798
Disclosure of deferred taxes [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Deferred income tax asset Canada $ 35,989 $ 79,483 Deferred income tax liability Canada - (34,379 ) Peru (177,519 ) (149,351 ) United States (107,691 ) (154,600 ) Deferred mining tax liability: Canada (5,615 ) (4,706 ) Peru (11,267 ) (11,880 ) (302,092 ) (354,916 ) Net deferred tax liability balance $ (266,103 ) $ (275,433 )
Disclosure of changes in deferred tax assets and liabilities [Table Text Block]	Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Net deferred tax liability balance, beginning of year $ (275,433 ) $ (253,859 ) Deferred income tax expense 15,032 (21,028 ) Deferred mining tax expense 82 (2,490 ) OCI transactions (3,845 ) 2,198 Items charged directly to equity 2,238 - Foreign currency translation on the deferred tax liability (4,177 ) (254 ) Net deferred tax liability balance, end of year $ (266,103 ) $ (275,433 )
Disclosure of reconciliation to statutory tax rate [Table Text Block]	Year ended December 31, 2017 2016 Statutory tax rate 27.00% 27.00% Tax expense at statutory rate $ 53,656 $ 1,513 Effect of: Deductions related to mining taxes (6,075 ) (3,223 ) Adjusted income taxes 47,581 (1,710 ) Mining tax expense 19,367 12,771 66,948 11,061 Permanent differences related to: Capital items 1,462 401 Other income tax permanent differences 338 262 Impact of remeasurement on decommissioning liability 15,290 13,803 Temporary income tax differences not recognized 10,015 8,598 Impact related to differences in tax rates in foreign operations 4,605 2,250 Impact of changes to statutory tax rate (52,855 ) 7,960 Foreign exchange on non-monetary items (9,387 ) (3,433 ) Impact related to tax assessments and tax return amendments (1,587 ) (104 ) Tax expense $ 34,829 $ 40,798
Disclosure of temporary differences recognized [Table Text Block]	Balance sheet Income Statement Year ended Year ended Dec. 31, Dec. 31, Dec. 31, Dec. 31, 2017 2016 2017 2016 Deferred income tax (liability) asset/ expense (recovery) Property, plant and equipment $ (102,053 ) $ 1,163 $ 103,216 $ (255 ) Pension obligation 10,034 942 (12,937 ) (215 ) Other employee benefits 16,742 2,972 (13,770 ) (1,471 ) Non-capital losses 91,495 59,034 (32,461 ) (24,098 ) Share issue and debt costs 15,707 16,319 2,850 (14,858 ) Other 4,064 (947 ) (8,810 ) 2,084 Deferred income tax asset / expense (recovery) 35,989 79,483 38,088 (38,813 ) Deferred income tax liability (asset)/ (recovery) expense Property, plant and equipment 313,581 417,060 (103,479 ) 22,810 Pension obligation - (12,150 ) 12,150 4,556 Other employee benefits 192 (14,806 ) 14,998 (2,111 ) Asset retirement obligations (789 ) (11,357 ) 10,568 4,701 Non-capital losses (27,539 ) (46,500 ) 18,961 21,567 Other (235 ) 6,083 (6,318 ) 8,318 Deferred income tax liability/ (recovery) expense 285,210 338,330 (53,120 ) 59,841 Deferred income tax liability/ (recovery) expense $ (249,221 ) $ (258,847 ) $ (15,032 ) $ 21,028
Disclosure of temporary differences not recognized [Table Text Block]	Dec. 31, Dec. 31, 2017 2016 Property, plant and equipment $ 32,089 $ 16,690 Capital losses 223,916 109,670 Other employee benefits 78,871 52,093 Asset retirement obligations 174,448 135,481 Non-capital losses 104,171 99,737 Temporary differences not recognized $ 613,495 $ 413,671
Disclosure of temporary differences - deferred mining tax assets and liabilities [Table Text Block]	Dec. 31, Dec. 31, Canada 2017 2016 Property, plant and equipment $ (5,615 ) $ (4,706 ) Dec. 31, Dec. 31, Peru 2017 2016 Property, plant and equipment $ (11,267 ) $ (11,880 )

Share capital (Tables)

Share capital (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about shares, activity explanatory [Table Text Block]	Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Common Common shares Amount shares Amount Balance, beginning of year 237,271,188 $ 1,588,319 235,231,688 $ 1,576,600 Equity issuance 24,000,000 195,295 2,039,500 11,814 Share issue costs, net of tax - (6,205 ) - (95 ) Balance, end of year 261,271,188 $ 1,777,409 237,271,188 $ 1,588,319

Share-based payments (Tables)

Share-based payments (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Disclosure of number and weighted average exercise prices of share options [Table Text Block]	Year ended Year ended Dec. 31, 2017 Dec. 31, 2016 Number Weighted Number Weighted of shares average of shares average subject exercise subject exercise to option price to option price C$ C$ Balance, beginning of year 1,470,377 $ 19.24 1,904,185 $ 17.57 Forfeited (20,002 ) 15.86 (125,677 ) 17.52 Expired (927,023 ) 21.22 (308,131 ) 9.70 Balance, end of year 523,352 $ 15.86 1,470,377 $ 19.24
Disclosure of range of exercise prices of outstanding share options [Table Text Block]	Dec. 31, 2017 Weighted- Weighted- Weighted- average average Number of average Range of Number of remaining exercise options exercise exercise prices options contractual life price exercisable price C$ outstanding (years) C$ C$ $15.86 523,352 0.2 $ 15.86 523,352 $ 15.86	Dec. 31, 2016 Weighted- average Weighted- Number of Weighted- Range of exercise Number of remaining average options average prices options contractual life exercise price exercisable exercise price C$ outstanding (years) C$ C$ $15.86 - 18.33 543,354 1.2 $ 15.86 543,354 $ 15.86 18.34 - 21.28 757,023 0.2 20.80 757,023 20.80 21.29 - 21.98 10,000 0.1 21.75 10,000 21.75 21.99 - 22.97 60,000 0.9 22.20 60,000 22.20 22.98 - 23.74 100,000 0.6 23.74 100,000 23.74 $15.86 - 23.74 1,470,377 0.6 $ 19.24 1,470,377 $ 19.24
Deferred Share Unit [Member]
Statement [Line Items]
Disclosure of number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2017 Dec. 31, 2016 Granted during the year: Number of units 130,964 231,867 Weighted average price (C$/unit) $ 8.59 $ 5.81 Expenses recognized during the year 1 $ 2,982 $ 2,111 Payments made during the year (note 18) $ 638 $ 1,078
Restricted Share Unit [Member]
Statement [Line Items]
Disclosure of number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2017 Dec. 31, 2016 Number of units, beginning of year 3,492,408 1,943,507 Number of units granted during the year 987,194 2,576,957 Credits for dividends 8,156 14,776 Number of units forfeited during the year (201,946 ) (133,329 ) Number of units vested 1 (880,099 ) (909,503 ) Number of units, end of year 3,405,713 3,492,408 Weighted average price - granted (C$/unit) $ 10.60 $ 4.01 Expenses recognized during the year 2 $ 12,937 $ 7,776 Payments made during the year (note 18) $ 5,491 $ 2,736

Earnings (loss) per share data

Earnings (loss) per share data (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Earnings per share [Table Text Block]	Year ended December 31, 2017 2016 Basic & diluted weighted average common shares outstanding 243,500,696 235,807,509

Financial instruments (Tables)

Financial instruments (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Disclosure of fair value measurement [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 Recurring measurements FV CV FV CV Loans and receivables Cash and cash equivalents 1 $ 356,499 $ 356,499 $ 146,864 $ 146,864 Restricted cash 1 206 206 17,148 17,148 Trade and other receivables 1, 2 142,199 142,199 116,445 116,445 Fair value through profit or loss Trade and other receivables - embedded derivatives 3 17,427 17,427 12,538 12,538 Non-hedge derivative assets 3 2,841 2,841 3,397 3,397 Prepayment option - embedded derivative 7 3,980 3,980 4,430 4,430 Investments at FVTPL 4 282 282 192 192 Available-for-sale investments 4 21,973 21,973 13,508 13,508 Total financial assets 545,407 545,407 314,522 314,522 Financial liabilities at amortized cost Trade and other payables 1, 2 192,448 192,448 163,027 163,027 Finance leases 84,573 84,573 12,932 12,932 Other financial liabilities 5 19,625 22,568 17,231 22,998 Senior unsecured notes 6 1,082,740 991,883 1,040,178 991,004 Equipment finance facility 8 - - 50,267 50,267 Senior secured revolving credit facilities 8 - - 202,075 202,075 Unamortized transaction costs 8 (8,328 ) (8,328 ) (6,752 ) (6,752 ) Fair value through profit or loss Embedded derivatives 3 1,533 1,533 86 86 Warrant liabilities 3 6,961 6,961 7,588 7,588 Option liabilities 3 732 732 570 570 Non-hedge derivative liabilities 1,3 16,140 16,140 10,682 10,682 Total financial liabilities 1,396,424 1,308,510 1,497,884 1,454,477 Net financial liability $ (851,017 ) $ (763,103 ) $ (1,183,362 ) $ (1,139,955 )
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [Table Text Block]	December 31, 2017 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Embedded derivatives $ - $ 17,427 $ - $ 17,427 Non-hedge derivatives - 2,841 - 2,841 Investments at FVTPL - 282 - 282 Prepayment option embedded derivative - 3,980 - 3,980 Available-for-sale investments 21,973 - - 21,973 $ 21,973 $ 24,530 $ - $ 46,503 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 1,533 $ - $ 1,533 Non-hedge derivatives - 16,140 - 16,140 Option liability - 732 - 732 Warrant liabilities 6,961 - - 6,961 $ 6,961 $ 18,405 $ - $ 25,366	December 31, 2016 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Embedded derivatives $ - $ 12,538 $ - $ 12,538 Non-hedge derivatives - 3,397 - 3,397 Investments at FVTPL - 192 - 192 Prepayment option embedded derivative - 4,430 - 4,430 Available-for-sale investments 12,018 - 1,490 13,508 $ 12,018 $ 20,557 $ 1,490 $ 34,065 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 86 $ - $ 86 Non-hedge derivatives - 10,682 - 10,682 Option liability - 570 - 570 Warrant liabilities 7,588 - - 7,588 $ 7,588 $ 11,338 $ - $ 18,926
Disclosure of detailed information about foreign currency risk [Table Text Block]	Dec. 31, 2017 Dec. 31, 2016 $ CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalents 9,518 $ 20,597 $ 3,692 4,759 $ 8,121 $ 3,440 Trade and other receivables 530 77,824 1,114 720 28,639 2,503 Other financial assets 22,255 - - 13,279 - - Trade and other payables (6,115 ) (9,687 ) (17,917 ) (20,014 ) (4,303 ) (17,145 ) Other financial liabilities (6,961 ) - (22,568 ) (7,588 ) - (22,998 ) $ 19,227 $ 88,734 $ (35,679 ) (8,844 ) $ 32,457 $ (34,200 )
Disclosure of foreign currency risk [Table Text Block]	Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 5.6 million $ (2.0) million USD/CAD exchange rate 1 - 10% (6.8) million 2.4 million USD/PEN exchange rate 2 + 10% 2.1 million - million USD/PEN exchange rate 2 - 10% (2.6) million - million	Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: USD/CAD exchange rate 1 + 10% 3.9 million (1.2) million USD/CAD exchange rate 1 - 10% (4.9) million 1.5 million USD/PEN exchange rate 2 + 10% 2.0 million - million USD/PEN exchange rate 2 - 10% (2.5) million - million
Disclosure of commodity price risk [Table Text Block]	Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Copper prices ($/lb) 3 + $0.30 $ (2.3) million $ - million Copper prices ($/lb) 3 - $0.30 2.3 million - million Zinc prices ($/lb) 4 + $0.10 0.9 million - million Zinc prices ($/lb) 4 - $0.10 (0.9) million - million	Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Copper prices ($/lb) 3 + $0.30 $ (4.8 ) million $ - million Copper prices ($/lb) 3 - $0.30 4.7 million - million Zinc prices ($/lb) 4 + $0.10 0.3 million - million Zinc prices ($/lb) 4 - $0.10 (0.3 ) million - million
Disclosure of share price risk explanatory [Table Text Block]	Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Share prices 5 + 25% $ - million $ 5.5 million Share prices 5 - 25% (1.9) million (3.6) million	Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Share prices 5 + 25% $ - million $ 4.5 million Share prices 5 - 25% (0.8) million (3.7) million
Disclosure of interest rate risk [Table Text Block]	Would have changed Would have changed December 31, 2017 Change of: 2017 after-tax profit by: 2017 after-tax OCI by: Interest rates + 2.00% $ 0.4 million $ - million Interest rates - 2.00% (2.8) million - million	Would have changed Would have changed December 31, 2016 Change of: 2016 after-tax profit by: 2016 after-tax OCI by: Interest rates + 2.00% $ (5.0) million $ - million Interest rates - 2.00% 0.7 million - million
Disclosure of liquidity risk [Table Text Block]	Carrying Contractual 12 months More than Dec. 31, 2017 amount cash flows or less 13 - 36 months 37 - 60 months 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 356,499 $ 356,499 $ 356,499 $ - $ - $ - Trade and other receivables 142,199 147,196 124,134 12,403 10,659 - Non-hedge derivative asset 2,841 2,841 2,841 - - - $ 501,539 $ 506,536 $ 483,474 $ 12,403 $ 10,659 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivative $ (192,821 ) $ (192,821 ) $ (192,821 ) $ - $ - $ - Other financial liabilities (22,568 ) (37,216 ) (3,824 ) (4,791 ) (4,780 ) (23,821 ) Long-term debt, including prepayment option embedded derivative (979,575 ) (1,520,416 ) (79,715 ) (159,430 ) (152,396 ) (1,128,875 ) Finance lease liabilities (84,573 ) (89,750 ) (20,186 ) (40,253 ) (29,311 ) - $ (1,279,537 ) $ (1,840,203 ) $ (296,546 ) $ (204,474 ) $ (186,487 ) $ (1,152,696 ) Derivative financial liabilities Warrant liabilities $ (6,961 ) $ (6,961 ) $ (6,961 ) $ - $ - $ - Gold option (732 ) (732 ) (732 ) - - - Non-hedge derivative contracts (16,140 ) (16,140 ) (15,263 ) (877 ) - - $ (23,833 ) $ (23,833 ) $ (22,956 ) $ (877 ) $ - $ -	More Carrying Contractual 12 months or than 60 Dec. 31, 2016 amount cash flows less 13 - 36 months 37 - 60 months months Assets used to manage liquidity risk Cash and cash equivalents $ 146,864 $ 146,864 $ 146,864 $ - $ - $ - Trade and other receivables 116,445 116,445 96,221 1,543 18,681 - Non-hedge derivative assets 3,397 3,397 3,397 - - - $ 266,706 $ 266,706 $ 246,482 $ 1,543 $ 18,681 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (163,113 ) $ (163,113 ) $ (163,113 ) $ - $ - $ - Other financial liabilities (22,998 ) (35,392 ) (4,025 ) (3,303 ) (4,616 ) (23,448 ) Long-term debt, including prepayment option embedded derivative (1,232,164 ) (1,946,925 ) (105,278 ) (105,278 ) (544,957 ) (1,191,412 ) Finance lease liabilities (12,932 ) (13,720 ) (3,508 ) (3,338 ) (6,874 ) - $ (1,431,207 ) $ (2,159,150 ) $ (275,924 ) $ (111,919 ) $ (556,447 ) $ (1,214,860 ) Derivative financial liabilities Warrant liabilities $ (7,588 ) $ (7,588 ) $ - $ - $ (7,588 ) $ - Gold option (570 ) (570 ) - - (570 ) - Non-hedge derivative contracts (10,682 ) (10,682 ) (10,682 ) - - - $ (18,840 ) $ (18,840 ) $ (10,682 ) $ - $ (8,158 ) $ -

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of maturity analysis of operating lease payments [Table Text Block]	2017 2016 Within one year $ 5,682 $ 5,591 After one year but not more than five years 12,291 12,606 More than five years 1,781 442 $ 19,754 $ 18,639 Payments recognized in operating expenses: 2017 2016 Minimum lease payments $ 4,972 $ 4,575 $ 4,972 $ 4,575

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of subsidiaries [Table Text Block]	Beneficial ownership of ultimate controlling party (Hudbay Minerals Inc.) Entity's Name Jurisdiction Business Parent 2017 2016 HudBay Marketing & Sales Inc. Canada Marketing and sales HMI 100% 100% HudBay Peru Inc. British Columbia Holding company HMI 100% 100% HudBay Peru S.A.C. Peru Exploration/ development Peru Inc. 100% 100% HudBay (BVI) Inc. British Virgin Islands Precious metals sales Peru Inc. 100% 100% Hudbay Arizona Inc. British Columbia Holding company HMI 100% 100% Rosemont Copper Company 1 Arizona Exploration/ development HudBay Arizona (US) Holding Corporation 100% 100%
Disclosure of information about key management personnel [Table Text Block]	2017 2016 Short-term employee benefits 1 $ 8,654 $ 8,470 Post-employment benefits 777 594 Long-term share-based awards 6,110 5,479 $ 15,541 $ 14,543

Supplementary cash flow infor62

Supplementary cash flow information (Tables)	12 Months Ended
	Dec. 31, 2017
Statement [Line Items]
Disclosure of detailed information about supplemental cash flow information [Table Text Block]	Year ended December 31, 2017 2016 Change in: Trade and other receivables $ (8,979 ) $ 68,270 Other financial assets/liabilities 6,620 19,181 Inventories (18,690 ) 2,653 Prepaid expenses and other current assets (4,619 ) 3,646 Trade and other payables (6,336 ) (8,339 ) Changes in taxes payable/receivable 39,326 3,666 Other 1,693 (1,871 ) $ 9,015 $ 87,206

Segmented information (Tables)

Segmented information (Tables)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Disclosure of geographical areas [Table Text Block]	Year ended December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 704,777 $ 657,776 $ - $ - $ 1,362,553 Cost of sales Mine operating costs 392,863 302,865 - - 695,728 Depreciation and amortization 118,770 174,110 - - 292,880 Gross profit 193,144 180,801 - - 373,945 Selling and administrative expenses - - - 42,283 42,283 Exploration and evaluation 5,649 1,442 - 8,383 15,474 Other operating (income) and expenses (56 ) (6,612 ) 517 (6,289 ) (12,440 ) Asset impairment 11,320 - - - 11,320 Results from operating activities $ 176,231 $ 185,971 $ (517 ) $ (44,377 ) $ 317,308 Finance income (2,849 ) Finance expenses 103,028 Other finance losses 18,401 Profit before tax 198,728 Tax expense 34,829 Profit for the year $ 163,899	Year ended December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 512,671 $ 616,007 $ - $ - $ 1,128,678 Cost of sales Mine operating costs 318,037 289,133 - - 607,170 Depreciation and amortization 120,531 178,099 - - 298,630 Gross profit 74,103 148,775 - - 222,878 Selling and administrative expenses - - - 37,774 37,774 Exploration and evaluation 1,228 1,262 - 2,252 4,742 Other operating expense (income) 5,490 7,790 618 (3,312 ) 10,586 Results from operating activities $ 67,385 $ 139,723 $ (618 ) $ (36,714 ) $ 169,776 Finance income (2,792 ) Finance expenses 167,071 Other finance gains (108 ) Profit before tax 5,605 Tax expense 40,798 Loss for the year $ (35,193 )
Disclosure of geographical areas, assets and liabilities [Table Text Block]	December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 743,019 $ 2,666,775 $ 856,589 $ 382,346 $ 4,648,729 Total liabilities 525,515 806,217 110,945 1,061,797 2,504,474 Property, plant and equipment 619,476 2,420,561 836,759 4,098 3,880,894	December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 769,561 $ 2,720,441 $ 822,498 $ 144,056 $ 4,456,556 Total liabilities 528,326 876,056 158,236 1,130,726 2,693,344 Property, plant and equipment 606,348 2,452,917 800,542 6,016 3,865,823
Disclosure of geographical areas, additions to property, plant and equipment [Table Text Block]	Year ended December 31, 2017 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 97,936 $ 143,372 $ 18,507 - $ 259,815	Year ended December 31, 2016 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 65,521 $ 125,489 $ 25,856 $ 19 $ 216,885
Disclosure of geographical areas, revenue by customer location [Table Text Block]	2017 2016 Revenue by customer location 1 Canada $ 421,247 $ 372,439 United States 236,467 146,419 Switzerland 159,085 256,377 Germany 144,684 39,703 China 145,935 139,200 Peru 101,033 68,964 Philippines 120,199 70,933 Other 33,903 34,643 $ 1,362,553 $ 1,128,678

Revenue and expenses (Narrative

Revenue and expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Gains (Losses) related to unrealized non-hedge derivative contracts	$ 6,089	$ 19,180
Employee share purchase plan, matching contribution, percentage	75.00%
Impairment loss recognised in profit or loss, property, plant and equipment	$ 11,320
Bottom of range [Member]
Statement [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	1.00%
Top of range [Member]
Statement [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	10.00%
Lalor [Member]
Statement [Line Items]
Impairment loss recognised in profit or loss, property, plant and equipment	$ 11,320
Manitoba [Member]
Statement [Line Items]
Profit sharing plan, percentage	10.00%
Peru [Member]
Statement [Line Items]
Profit sharing plan, percentage	8.00%

Trade and other receivables (Na

Trade and other receivables (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Statutory receivables	$ 13,961	$ 43,808
Peru [Member]
Statement [Line Items]
Statutory receivables	$ 10,905	$ 42,273

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Cost of inventories recognised as expense during period	$ 855,141	$ 803,802

Other financial assets (Narrati

Other financial assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Reclassification adjustments on impairment of available-for-sale financial investments	$ 2,059	$ 1,102

Other financial liabilities (Na

Other financial liabilities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017CAD ($)
Statement [Line Items]
Number of warrants granted in share-based payment arrangement	21,830,490
Weighted average exercise price of warrants granted in share-based payment arrangement	$ 15
Description of expected timing of outflows, contingent liabilities in business combination	The purchase price of the acquisition of New Britannia Mine and Mill contained an option (European) that pays the seller $5,000 if the price of gold is equal to or above $1,400/oz on May 4, 2018.

Finance lease obligations (Narr

Finance lease obligations (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Statement [Line Items]
Proceeds from sale and leaseback transactions	$ 67,275
Finance lease obligations [Member] | Bottom of range [Member]
Statement [Line Items]
Borrowings, interest rate	1.95%
Finance lease obligations [Member] | Top of range [Member]
Statement [Line Items]
Borrowings, interest rate	4.45%

Long-term debt (Narrative) (Det

Long-term debt (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Senior unsecured notes [Member]
Statement [Line Items]
Payments made		$ 920,000
Borrowings, interest rate	9.50%	9.50%
Write-down of unamortized transaction costs		$ 2,216
Tender premium on 9.50% senior unsecured notes	$ 0	47,718
Proceeds from issue of notes		1,000,000
Senior secured revolving credit facilities [Member]
Statement [Line Items]
Payments made	$ 227,075	$ 160,000
Description of senior secured facilities	On July 14, 2017, the Group entered into amendments to its two senior credit facilities to secure both facilities with substantially all of the Group’s assets other than assets related to the Rosemont project, amend the financial covenants, extend the maturity dates from March 31, 2019 to July 14, 2021 and reduce the interest rate from LIBOR plus 4.50% to LIBOR plus 3.00%, based on financial results for the twelve months ended June 30, 2017. The two facilities have substantially similar terms and conditions.
The 2023 Notes [Member]
Statement [Line Items]
Borrowings, interest rate		7.25%
Proceeds from issue of notes		$ 400,000
The 2025 Notes [Member]
Statement [Line Items]
Borrowings, interest rate		7.625%
Proceeds from issue of notes		$ 600,000

Deferred revenue (Narrative) (D

Deferred revenue (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	15 Months Ended
	Feb. 28, 2010	Nov. 04, 2013
Statement [Line Items]
Deposits from customers	$ 230,000	$ 885,000
Description of additional deposit payments	In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $450 per ounce (for gold) and $3.90 per ounce (for silver), subject to 1% annual escalation after three years. To date, no such deposit has been received under the terms of this contract.	In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $400 per ounce (for gold) and $5.90 per ounce (for silver), subject to 1% annual escalation after three years.

Provisions (Narrative) (Details

Provisions (Narrative) (Details)	Dec. 31, 2017	Dec. 31, 2016
Bottom of range [Member]
Statement [Line Items]
Provision estimates, discount rate used	1.43%	0.63%
Top of range [Member]
Statement [Line Items]
Provision estimates, discount rate used	2.74%	3.07%

Pension obligations (Narrative)

Pension obligations (Narrative) (Details) - Pension obligations [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016
Statement [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 19,401
Weighted average duration of defined benefit obligation	15.8	15.7
Return on plan assets, percentage	11.50%	5.01%
Active members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	18.4	17.1
Deferred members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	26.9	23.5
Retired members [Member]
Statement [Line Items]
Weighted average duration of defined benefit obligation	10.2	12.4
Actuarial assumption of discount rates [Member]
Statement [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 27,622
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 31,183
Actuarial assumption of expected rates of salary increases [Member]
Statement [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3,893
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 3,533
Actuarial assumptions of life expectancy [Member]
Statement [Line Items]
Reasonably possible increase in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 5,804
Reasonably possible decrease in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 5,903

Other employee benefits (Narrat

Other employee benefits (Narrative) (Details) - Other employee benefits [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016
Statement [Line Items]
Weighted average duration of non-pension post employment obligation	18.9	18.1
Inactive members [Member]
Statement [Line Items]
Weighted average duration of non-pension post employment obligation	13.1	12.7
Active members [Member]
Statement [Line Items]
Weighted average duration of non-pension post employment obligation	22.8	22.1
Actuarial assumption of discount rates [Member]
Statement [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 9,095
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 10,440
Actuarial assumption of health care cost trend rates [Member]
Statement [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 21,821
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 16,888
Actuarial assumptions of life expectancy [Member]
Statement [Line Items]
Reasonably possible increase in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3,917
Reasonably possible decrease in life expectancy (years)	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 3,880

Income and mining taxes (Narrat

Income and mining taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 613,495	$ 413,671
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits	The Canadian non-capital losses were incurred between 2006 and 2017 and expire between 2026 and 2037. The Group incurred United States net operating losses between 2004 and 2017 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2013 to 2016 which have a four year carry forward period.
Mining tax effect of temporary differences recognized [Member]
Statement [Line Items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 8,740	$ 7,610

Share capital (Narrative) (Deta

Share capital (Narrative) (Details) $ in Thousands	Mar. 09, 2018CAD ($)	Feb. 21, 2018CAD ($)	Sep. 29, 2017USD ($)	Sep. 27, 2017USD ($)shares	Mar. 31, 2017USD ($)	Sep. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017CAD ($)	Dec. 31, 2016USD ($)shares
Statement [Line Items]
Increase (decrease) in number of shares outstanding | shares				24,000,000
Proceeds from issuing shares | $				$ 189,090
Dividends paid, amount per share | $									$ 0.01
Dividends paid | $			$ 1,912		$ 1,774	$ 1,794	$ 1,773	$ 3,686		$ 3,567
Dividends declared, amount per share | $		$ 0.01
Dividends declared | $	$ 2,613,000
Vesting of restricted share units [Member]
Statement [Line Items]
Increase (decrease) in number of shares outstanding | shares										1,000,000
Proceeds from issuing shares | $										$ 4,958
The exercise of 3,300,000 Augusta warrants [Member]
Statement [Line Items]
Increase (decrease) in number of shares outstanding | shares										1,039,500
Proceeds from issuing shares | $										$ 6,761
Warrants issued | shares										561,000
Warrants exercised | shares										3,300,000
Warrants exercised, shares per warrant | shares										0.315
Warrants exercised, warrants per warrant | shares										0.17

Share-based payments (Narrative

Share-based payments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Statement [Line Items]
Liability related to deferred share unit plan	$ 6,623	$ 3,933
Liability related to restricted share unit plan	$ 19,409	$ 11,052
Restricted share units vested, but unreleased and unpaid	587,633
Stock option plan [Member]
Statement [Line Items]
Description of stock option plan, number of options authorized	Under the amended Plan, the Group may grant to employees, officers, directors or consultants of the Group or its affiliates options to purchase up to a maximum of 13 million common shares of the Group. Options granted under the amended Plan have a maximum term of five years and become exercisable as follows: the first 33 1/3% are exercisable after one year, the next 33 1/3% are exercisable after two years, and the last 33 1/3% are exercisable after three years.
Stock option plan, prior to May 2008 amendment [Member]
Statement [Line Items]
Description of stock option plan, number of options authorized	Prior to the May 2008 amendment, the Plan approved in June 2005 allowed the Group to grant options up to 10% (to a maximum of 8 million issued outstanding options) of the issued and outstanding common shares of the Group to employees, officers, and directors of the Group for a maximum term of ten years. Of the common shares covered by the stock option plan, the first 33 1/3% were exercisable immediately, the next 33 1/3% were exercisable after one year, and the last 33 1/3% were exercisable after two years.

Capital management (Narrative)

Capital management (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Long-term debt	$ 979,575	$ 1,215,674
Cash and cash equivalents	$ 356,499	$ 146,864	$ 53,852

Financial instruments (Narrativ

Financial instruments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Statement [Line Items]
Tonnes of copper fixed for floating swaps	34,500	41,000
Average price recorded for copper fixed for floating swaps	3.10	2.42
Tonnes of zinc forward sales contracts	2,808	2,644
Tonnes of copper contracts awaiting final provisional pricing	38,027	32,750
Tonnes of zinc contracts awaiting final provisional pricing	6,412	0
Tonnes of gold contracts awaiting final provisional pricing	24,553	13,827
Tonnes of silver contracts awaiting final provisional pricing	172,886	116,912
Average price recorded for copper contracts subject to final settlement	3.29	2.51
Average price recorded for zinc contracts subject to final settlement	1.51	0
Average price recorded for gold contracts subject to final settlement	1,309	1,151
Average price recorded for silver contracts subject to final settlement	17.10	15.96
Derivative financial assets	$ 2,841,000	$ 3,397,000
Derivative financial liabilities	16,140,000	10,682,000
Aggregate fair value of other embedded derivatives	1,533,000	86,000
Prepayment option - embedded derivative	$ 3,980,000	$ 4,430,000
Warrants issued, acquisition	22,391,490
Warrants issued, acquisition, exercise price	$ 15
Description of expected timing of outflows, contingent liabilities in business combination	The purchase price of the acquisition of New Britannia Mine and Mill contained an option (European) that pays the seller $5,000 if the price of gold is equal to or above $1,400/oz on May 4, 2018.
Deposits and other investments with Schedule 1 Canadian banks, as a percentage of total cash and cash equivalents	97.00%	87.00%
Percentage of entity's trade receivables that are insured	75.00%	79.00%
Credit insurance deductible	10.00%
Percentage of receivables that represent largest customers	77.00%	79.00%
Trade receivables aged over thirty days		$ 0
Bottom of range [Member]
Statement [Line Items]
Range of zinc forward sales contracts prices	2,534,000	1,514,000
Top of range [Member]
Statement [Line Items]
Range of zinc forward sales contracts prices	3,292,000	2,783,000
Peru [Member]
Statement [Line Items]
Letters of credit issued to support reclamation or pension obligations	$ 71,932,000
Restricted cash	206,000
Manitoba [Member]
Statement [Line Items]
Letters of credit issued to support reclamation or pension obligations	56,633,000
Copper fixed for floating swaps [Member]
Statement [Line Items]
Derivative financial liabilities	13,786,000	$ 8,657,000
Non-hedge derivative zinc contracts [Member]
Statement [Line Items]
Derivative financial assets	487,000	1,373,000
Provisional pricing - copper [Member]
Statement [Line Items]
Derivative financial assets	$ 17,427,000	$ 12,538,000

Commitments and contingencies80

Commitments and contingencies (Narrative) (Details) $ in Thousands	Dec. 31, 2017USD ($)
Peru [Member]
Statement [Line Items]
Capital commitments	$ 86,044
Canada [Member]
Statement [Line Items]
Capital commitments	25,793
Canada [Member] | Amounts which cannot be terminated [Member]
Statement [Line Items]
Capital commitments	2,556
Rosemont project in Arizona [Member]
Statement [Line Items]
Capital commitments	162,412
Rosemont project in Arizona [Member] | Amounts which cannot be terminated [Member]
Statement [Line Items]
Capital commitments	$ 78,646

Related parties (Narrative) (De

Related parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017
Rosemont Copper Company [Member]
Statement [Line Items]
Description of non-controlling interest	Rosemont Copper Company currently owns a 92.05% interest in the Rosemont project; its interest is subject to an earn-in agreement with United Copper & Moly LLC ("UCM"), pursuant to which UCM has earned a 7.95% interest in the project and may earn up to a 20% interest.

Supplementary cash flow infor82

Supplementary cash flow information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Increase to property, plant and equipment assets due to remeasurements of decommissioning and restoration liabilities	$ 10,661	$ 24,956
Additions related to capital additions under finance lease, property, plant and equipment	3,234	12,932
Proceeds from sale leaseback	$ 67,275	$ 0

Segmented information (Narrativ

Segmented information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Customer 1 [Member]
Statement [Line Items]
Percentage of entity's revenue	27.00%	27.00%
Customer 2 [Member]
Statement [Line Items]
Percentage of entity's revenue	11.00%	22.00%
Customer 3 [Member]
Statement [Line Items]
Percentage of entity's revenue	11.00%	13.00%
Customer 4 [Member]
Statement [Line Items]
Percentage of entity's revenue	5.00%	12.00%
Customer 5 [Member]
Statement [Line Items]
Percentage of entity's revenue		6.00%

Disclosure of detailed informat

Disclosure of detailed information about estimated useful life or depreciation rate explanatory (Details)	12 Months Ended
	Dec. 31, 2017
Equipment [Member]
Statement [Line Items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 21 years
Other plant assets [Member]
Statement [Line Items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 21 years / unit of production

Disclosure of detailed inform85

Disclosure of detailed information about revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Copper	$ 925,074	$ 835,470
Zinc	352,941	236,971
Gold	130,837	119,792
Silver	45,793	52,108
Other	13,974	2,719
Revenue from sale of goods	1,468,619	1,247,060
Treatment and refining charges	(106,066)	(118,382)
Revenue	$ 1,362,553	$ 1,128,678

Disclosure of depreciation and

Disclosure of depreciation and amortization expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Depreciation and amortization	$ 293,235	$ 299,134
Cost of sales [Member]
Statement [Line Items]
Depreciation and amortization	292,880	298,630
Selling and administrative expenses [Member]
Statement [Line Items]
Depreciation and amortization	$ 355	$ 504

Disclosure of detailed inform87

Disclosure of detailed information about share-based payment expenses (recoveries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Share-based payment expenses (recoveries)	$ 15,919	$ 9,887
Cost of sales [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	1,946	860
Selling and administrative expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	12,649	8,563
Other operating expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	1,324	464
Restricted Share Unit [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	12,937	7,776
Restricted Share Unit [Member] | Cost of sales [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	1,946	860
Restricted Share Unit [Member] | Selling and administrative expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	9,667	6,452
Restricted Share Unit [Member] | Other operating expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	1,324	464
Deferred Share Unit [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	2,982	2,111
Deferred Share Unit [Member] | Cost of sales [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	0	0
Deferred Share Unit [Member] | Selling and administrative expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	2,982	2,111
Deferred Share Unit [Member] | Other operating expenses [Member]
Statement [Line Items]
Share-based payment expenses (recoveries)	$ 0	$ 0

Disclosure of detailed inform88

Disclosure of detailed information about employee benefits expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Current employee benefits	$ 147,760	$ 136,299
Profit-sharing plan expense	19,757	5,064
Share-based payments	15,919	9,887
Employee share purchase plan	1,328	1,303
Defined benefit plans	10,132	12,121
Defined contribution plans	2,443	1,061
Past service costs	10,442	0
Other post-retirement employee benefits	7,250	7,406
Termination benefits	419	1,810
Employee benefits expense	215,450	174,951
Restricted Share Unit [Member]
Statement [Line Items]
Share-based payments	12,937	7,776
Deferred Share Unit [Member]
Statement [Line Items]
Share-based payments	$ 2,982	$ 2,111

Disclosure of other operating e

Disclosure of other operating expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Other operating expenses	$ (12,440)	$ 10,586
Regional costs [Member]
Statement [Line Items]
Other operating expenses	4,308	4,388
Other expenses
Statement [Line Items]
Other operating expenses	2,509	6,198
Constancia insurance recovery [Member]
Statement [Line Items]
Other operating expenses	(12,857)	$ 0
Realized gain on contingent consideration of Balmat [Member]
Statement [Line Items]
Other operating expenses	$ (6,400)

Disclosure of finance cost (inc

Disclosure of finance cost (income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Finance income	$ (2,849)	$ (2,792)
Interest expense on long-term debt	87,819	108,767
Accretion on financial liabilities at amortized cost	1,302	1,316
Unwinding of discounts on provisions	4,159	2,586
Withholding taxes	9,641	10,083
Other finance expense	13,256	11,306
Gross finance expense	116,177	181,776
Interest capitalized	(13,149)	(14,705)
Total Finance expense	103,028	167,071
Net foreign exchange (gain) loss	15,772	(489)
Hudbay warrants	(1,051)	2,111
Embedded derivatives	1,790	(1,238)
Investments classified as held-for-trading	(80)	(119)
Reclassification adjustments on disposal of available-for-sale financial investments	(89)	(1,475)
Reclassification adjustments on impairment of available-for-sale financial investments	2,059	1,102
Total other finance (income) expense	18,401	(108)
Net finance expense	$ 118,580	$ 164,171
Senior unsecured notes [Member]
Statement [Line Items]
Borrowings, interest rate	9.50%	9.50%
Tender premium on 9.50% senior unsecured notes	$ 0	$ 47,718
The 2023 Notes [Member]
Statement [Line Items]
Borrowings, interest rate		7.25%
The 2025 Notes [Member]
Statement [Line Items]
Borrowings, interest rate		7.625%

Disclosure of detailed inform91

Disclosure of detailed information about impairment loss by segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Pre-tax impairment	$ 11,320	$ 0
Manitoba [Member]
Statement [Line Items]
Pre-tax impairment	11,320
Tax impact - recovery	(3,849)
After-tax impairment charge	7,471
Property, plant and equipment [Domain] | Manitoba [Member]
Statement [Line Items]
Pre-tax impairment	$ 11,320

Disclosure of detailed inform92

Disclosure of detailed information about cash and cash equivalents explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Cash on hand and demand deposits	$ 356,499	$ 129,850
Short-term money market instruments with maturities of three months or less at acquisition date	0	17,014
Cash and cash equivalents	$ 356,499	$ 146,864	$ 53,852

Disclosure of detailed inform93

Disclosure of detailed information about trade and other receivables explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Trade receivables	$ 119,055	$ 85,386
Embedded derivatives - provisional pricing	17,427	12,538
Statutory receivables	13,961	43,808
Receivable from joint venture partners	2,808	0
Other receivables	2,271	10,835
Total current trade and other receivables	155,522	152,567
Taxes receivable	14,394	12,424
Receivable from joint venture partners	16,414	18,681
Other receivables	1,651	1,543
Trade and other non-current receivables	32,459	32,648
Trade and other receivables	$ 187,981	$ 185,215

Disclosure of detailed inform94

Disclosure of detailed information about inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Stockpile	$ 13,468	$ 9,368
Work in progress	14,552	9,100
Finished goods	71,906	54,583
Materials and supplies	41,756	39,413
Current Inventories	141,682	112,464
Noncurrent Materials and supplies	5,809	4,537
Total Inventories	$ 147,491	$ 117,001

Disclosure of other financial a

Disclosure of other financial assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Derivative assets	$ 2,841	$ 3,397
Available-for-sale investments	21,973	13,508	$ 9,206
Investments at fair value through profit or loss	282	192
Restricted cash	206	17,148
Total other non-current financial assets	22,461	30,848
Total other financial assets	$ 25,302	$ 34,245

Disclosure of available-for-sal

Disclosure of available-for-sale financial assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Balance, beginning of year	$ 13,508	$ 9,206
Additions	5,265	2,857
Increase (decrease) from remeasurement to fair value	2,507	3,598
Disposals	(229)	(2,206)
Effect of movements in exchange rates	922	53
Balance, end of year	$ 21,973	$ 13,508

Disclosure of detailed inform97

Disclosure of detailed information about intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Balance, beginning of year	$ 6,614
Balance, end of year	5,575	$ 6,614
Cost [Member]
Statement [Line Items]
Balance, beginning of year	16,998	16,179
Additions	1,203	407
Effects of movement in exchange rates	968	412
Balance, end of year	19,169	16,998
Accumulated amortization [Member]
Statement [Line Items]
Balance, beginning of year	10,384	7,320
Amortization for the year	2,541	2,882
Effects of movement in exchange rates	669	182
Balance, end of year	$ 13,594	$ 10,384

Disclosure of detailed inform98

Disclosure of detailed information about property, plant and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Balance, beginning of year	$ 3,865,823
Decommissioning and restoration	10,661	$ 24,956
Interest capitalised	13,149	14,705
Impairment	(11,320)
Balance, end of year	3,880,894	3,865,823
Exploration and evaluation assets [Member]
Statement [Line Items]
Balance, beginning of year	15,015
Balance, end of year	23,010	15,015
Capital works in progress [Member]
Statement [Line Items]
Balance, beginning of year	844,759
Balance, end of year	933,531	844,759
Mining properties [Member]
Statement [Line Items]
Balance, beginning of year	1,251,972
Balance, end of year	1,224,077	1,251,972
Plant and equipment [member]
Statement [Line Items]
Balance, beginning of year	1,754,077
Balance, end of year	1,700,276	1,754,077
Cost [Member]
Statement [Line Items]
Balance, beginning of year	5,003,864	4,720,776
Additions	190,637	148,333
Capitalized stripping and development	69,178	68,552
Decommissioning and restoration	10,661	24,956
Interest capitalised	13,149	14,705
Transfers and other movements	0	0
Impairment	(11,320)
Disposals	(11,199)	(12,590)
Effects of movement in exchange rates	100,687	38,978
Other	7,354	154
Balance, end of year	5,373,011	5,003,864
Cost [Member] | Exploration and evaluation assets [Member]
Statement [Line Items]
Balance, beginning of year	15,015	14,650
Additions	7,000	0
Capitalized stripping and development	0	0
Decommissioning and restoration	0	0
Interest capitalised	0	0
Transfers and other movements	0	0
Impairment	0
Disposals	0	0
Effects of movement in exchange rates	995	365
Other	0	0
Balance, end of year	23,010	15,015
Cost [Member] | Capital works in progress [Member]
Statement [Line Items]
Balance, beginning of year	844,759	812,618
Additions	156,807	87,505
Capitalized stripping and development	0	19,666
Decommissioning and restoration	51	(46)
Interest capitalised	13,149	14,705
Transfers and other movements	(79,671)	(89,506)
Impairment	(11,320)
Disposals	(13)	(1,501)
Effects of movement in exchange rates	2,955	1,334
Other	6,814	(16)
Balance, end of year	933,531	844,759
Cost [Member] | Mining properties [Member]
Statement [Line Items]
Balance, beginning of year	1,775,432	1,603,952
Additions	0	45,383
Capitalized stripping and development	69,178	48,886
Decommissioning and restoration	5,509	1,966
Interest capitalised	0	0
Transfers and other movements	0	56,848
Impairment	0
Disposals	(1,600)	0
Effects of movement in exchange rates	49,184	18,382
Other	85	15
Balance, end of year	1,897,788	1,775,432
Cost [Member] | Plant and equipment [member]
Statement [Line Items]
Balance, beginning of year	2,368,658	2,289,556
Additions	26,830	15,445
Capitalized stripping and development	0	0
Decommissioning and restoration	5,101	23,036
Interest capitalised	0	0
Transfers and other movements	79,671	32,658
Impairment	0
Disposals	(9,586)	(11,089)
Effects of movement in exchange rates	47,553	18,897
Other	455	155
Balance, end of year	2,518,682	2,368,658
Accumulated depreciation [member]
Statement [Line Items]
Balance, beginning of year	1,138,041	830,500
Depreciation for the year	301,306	297,595
Disposals	(7,540)	(9,160)
Effects of movement in exchange rates	60,257	18,886
Other	53	220
Balance, end of year	1,492,117	1,138,041
Accumulated depreciation [member] | Exploration and evaluation assets [Member]
Statement [Line Items]
Balance, beginning of year	0	0
Depreciation for the year	0	0
Disposals	0	0
Effects of movement in exchange rates	0	0
Other	0	0
Balance, end of year	0	0
Accumulated depreciation [member] | Capital works in progress [Member]
Statement [Line Items]
Balance, beginning of year	0	0
Depreciation for the year	0	0
Disposals	0	0
Effects of movement in exchange rates	0	0
Other	0	0
Balance, end of year	0	0
Accumulated depreciation [member] | Mining properties [Member]
Statement [Line Items]
Balance, beginning of year	523,460	394,098
Depreciation for the year	118,754	119,420
Disposals	0	0
Effects of movement in exchange rates	31,516	9,810
Other	(19)	132
Balance, end of year	673,711	523,460
Accumulated depreciation [member] | Plant and equipment [member]
Statement [Line Items]
Balance, beginning of year	614,581	436,402
Depreciation for the year	182,552	178,175
Disposals	(7,540)	(9,160)
Effects of movement in exchange rates	28,741	9,076
Other	72	88
Balance, end of year	$ 818,406	$ 614,581

Disclosure of detailed inform99

Disclosure of detailed information about trade and other payables explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Trade payables	$ 71,336	$ 80,509
Accruals and payables	86,078	78,154
Accrued interest	34,848	4,300
Exploration and evaluation payables	186	64
Embedded derivatives - provisional pricing	373	86
Statutory payables	6,296	6,549
Trade and other payables	$ 199,117	$ 169,662

Disclosure of other current lia

Disclosure of other current liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Provisions	$ 27,370	$ 14,367
Pension liability	19,401	24,635
Other employee benefits	2,756	2,356
Unearned revenue	2,435	849
Other liabilities	$ 51,962	$ 42,207

Disclosure of detailed infor101

Disclosure of detailed information about other financial liabilities explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Derivative liabilities	$ 16,140	$ 10,682
Warrants at fair value through profit and loss, current	6,961	0
Contingent consideration - gold price option, current	732	0
Other financial liabilities at amortized cost, current	2,360	2,813
Embedded derivatives, current	297	0
Other financial liabilities, current	26,760	13,495
Contingent consideration - gold price option, non-current	0	570
Warrants at fair value through profit and loss, non-current	0	7,588
Other financial liabilities at amortized cost, non-current	19,938	20,185
Embedded derivatives, non-current	863	0
Other financial liabilities, non-current	20,801	28,343
Other financial liabilities	$ 47,561	$ 41,838

Disclosure of additional inform

Disclosure of additional information about leasing activities for lessee (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Total minimum lease payments	$ 89,750	$ 13,720
Effect of discounting	(5,177)	(788)
Present value of minimum lease payments	84,573	12,932
Less: current portion	(18,327)	(3,172)
Minimum finance lease payments payable noncurrent	66,246	9,760
Less than 12 months [Member]
Statement [Line Items]
Total minimum lease payments	20,186	3,508
13-36 months [Member]
Statement [Line Items]
Total minimum lease payments	40,253	6,667
37-60 months [Member]
Statement [Line Items]
Total minimum lease payments	29,311	3,545
More than 60 months [Member]
Statement [Line Items]
Total minimum lease payments	$ 0	$ 0

Disclosure of detailed infor103

Disclosure of detailed information about borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Borrowings, beginning balance	$ 1,232,164
Borrowings, ending balance	979,575	$ 1,232,164
Senior unsecured notes [Member]
Statement [Line Items]
Borrowings, beginning balance	986,574	917,329
Addition to Principal, net of transaction costs		987,671
Transaction costs	(133)
Payments made		(920,000)
Change in fair value of embedded derivative (prepayment option)	450	(1,146)
Write-down of unamortized transaction costs		2,216
Accretion of transaction costs and premiums	1,012	504
Borrowings, ending balance	987,903	986,574
Equipment finance facility [Member]
Statement [Line Items]
Borrowings, beginning balance	50,267	66,521
Transaction costs	(326)	(1,013)
Payments made	(54,364)	(16,490)
Write-down of unamortized transaction costs	3,552
Accretion of transaction costs and premiums	871	1,249
Borrowings, ending balance	0	50,267
Senior secured revolving credit facilities [Member]
Statement [Line Items]
Borrowings, beginning balance	202,075	297,075
Addition to Principal, net of transaction costs	25,000	65,000
Payments made	(227,075)	(160,000)
Borrowings, ending balance	0	202,075
Unamortized transaction costs - revolving credit facilities [Member]
Statement [Line Items]
Transaction costs	(4,867)	(4,979)
Accretion of transaction costs and premiums	$ 3,291	$ 4,272

Disclosure of borrowings (Detai

Disclosure of borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Current portion of long-term debt	$ 0	$ 16,490
Non-current portion of long-term debt	979,575	1,215,674
Total debt	979,575	1,232,164
Senior unsecured notes [Member]
Statement [Line Items]
Total debt	987,903	986,574	$ 917,329
Equipment finance facility [Member]
Statement [Line Items]
Current portion of long-term debt	0	16,490
Non-current portion of long-term debt	0	33,777
Total debt	0	50,267	66,521
Senior secured revolving credit facilities [Member]
Statement [Line Items]
Total debt	0	202,075	297,075
Unamortized transaction costs - revolving credit facilities [Member]
Statement [Line Items]
Less: Unamortized transaction costs - revolving credit facilities	$ (8,328)	$ (6,752)	$ (6,045)

Disclosure of detailed infor105

Disclosure of detailed information about unamortized transaction costs - revolving credit facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equipment finance facility [Member]
Statement [Line Items]
Accretion of transaction costs	$ (871)	$ (1,249)
New transaction costs	326	1,013
Senior unsecured notes [Member]
Statement [Line Items]
Accretion of transaction costs	(1,012)	(504)
New transaction costs	133
Unamortized transaction costs - revolving credit facilities [Member]
Statement [Line Items]
Unamortized transaction costs, beginning balance	6,752	6,045
Accretion of transaction costs	(3,291)	(4,272)
New transaction costs	4,867	4,979
Unamortized transaction costs, ending balance	$ 8,328	$ 6,752

Disclosure of changes in deferr

Disclosure of changes in deferred revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Stream accounting - Deferred revenue, begining balance	$ 537,852	$ 597,260
Recognition of revenue	(48,958)	(65,762)
Effects of changes in foreign exchange	9,150	6,354
Stream accounting - Deferred revenue, ending balance	$ 498,044	$ 537,852

Disclosure of detailed infor107

Disclosure of detailed information about deferred revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Current	$ 49,907	$ 65,619
Non-current	448,137	472,233
Deferred revenue	$ 498,044	$ 537,852	$ 597,260

Disclosure of changes in provis

Disclosure of changes in provisions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Provisions, beginning balance	$ 194,069	$ 154,226
Net additional provisions made	14,882	39,326
Amounts used	(7,135)	(5,138)
Unwinding of discount	4,159	2,586
Effect of change in discount rate	2,658	(4,189)
Effect of foreign exchange	11,147	2,790
Effect of change in share price	7,728	4,468
Provisions, ending balance	227,508	194,069
Decommissioning, restoration and similar liabilities [Member]
Statement [Line Items]
Provisions, beginning balance	177,296	147,035
Net additional provisions made	6,485	30,038
Amounts used	(69)	(894)
Unwinding of discount	4,159	2,586
Effect of change in discount rate	2,658	(4,189)
Effect of foreign exchange	9,512	2,720
Effect of change in share price	0	0
Provisions, ending balance	200,041	177,296
Deferred share units [Member]
Statement [Line Items]
Provisions, beginning balance	3,933	2,803
Net additional provisions made	868	1,018
Amounts used	(638)	(1,078)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	346	97
Effect of change in share price	2,114	1,093
Provisions, ending balance	6,623	3,933
Restricted share units [Member]
Statement [Line Items]
Provisions, beginning balance	11,052	4,388
Net additional provisions made	7,327	6,348
Amounts used	(5,491)	(2,736)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	1,194	(47)
Effect of change in share price	5,327	3,099
Provisions, ending balance	19,409	11,052
Other provisions [Member]
Statement [Line Items]
Provisions, beginning balance	1,788	0
Net additional provisions made	202	1,922
Amounts used	(937)	(430)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	95	20
Effect of change in share price	287	276
Provisions, ending balance	$ 1,435	$ 1,788

Disclosure of detailed infor109

Disclosure of detailed information about provisions (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Current provisions	$ 27,370	$ 14,367
Non-current provisions	200,138	179,702
Total provisions	227,508	194,069	$ 154,226
Decommissioning, restoration and similar liabilities [Member]
Statement [Line Items]
Current provisions	2,344	1,054
Non-current provisions	197,697	176,242
Total provisions	200,041	177,296	147,035
Deferred share units [Member]
Statement [Line Items]
Current provisions	6,623	3,933
Non-current provisions	0	0
Total provisions	6,623	3,933	2,803
Restricted share units [Member]
Statement [Line Items]
Current provisions	17,119	8,451
Non-current provisions	2,290	2,601
Total provisions	19,409	11,052	4,388
Other provisions [Member]
Statement [Line Items]
Current provisions	1,284	929
Non-current provisions	151	859
Total provisions	$ 1,435	$ 1,788	$ 0

Disclosure of additional inf110

Disclosure of additional information about defined benefit plans (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Opening defined benefit obligation	$ 349,165	$ 337,004
Current service cost	10,707	10,768
Past service cost related to the new collective bargaining agreement	10,442	0
Interest cost	12,602	13,415
Benefits paid from plan	(33,721)	(32,644)
Benefits paid from employer	(999)	(1,424)
Participant contributions	93	93
Effects of movements in exchange rates	24,440	10,348
Arising from changes in demographic assumptions	1,598	0
Arising from changes in financial assumptions	9,402	14,955
Arising from experience adjustments	(675)	(3,350)
Closing defined benefit obligation	$ 383,054	$ 349,165

Disclosure of additional inf111

Disclosure of additional information about defined benefit plans, balance by member group (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Closing defined benefit obligation	$ 383,054	$ 349,165	$ 337,004
Active members [Member]
Statement [Line Items]
Closing defined benefit obligation	250,965	235,815
Deferred members [Member]
Statement [Line Items]
Closing defined benefit obligation	4,304	3,636
Retired members [Member]
Statement [Line Items]
Closing defined benefit obligation	$ 127,785	$ 109,714

Disclosure of changes in fair v

Disclosure of changes in fair value of plan assets (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Opening fair value of plan assets	$ 296,151	$ 279,523
Interest income	11,005	11,634
Return on plan assets (excluding amounts included in net interest expense)	24,437	2,905
Contributions from the employer	22,484	26,198
Employer direct benefit payments	999	1,424
Contributions from plan participants	93	93
Benefit payment from employer	(999)	(1,424)
Administrative expenses paid from plan assets	(80)	(77)
Benefits paid	(33,721)	(32,644)
Effects of changes in foreign exchange rates	21,063	8,519
Closing fair value of plan assets	$ 341,432	$ 296,151

Disclosure of net defined benef

Disclosure of net defined benefit liability (asset) (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Present value of funded defined benefit obligation	$ 365,655	$ 333,720
Fair value of plan assets	(341,432)	(296,151)	$ (279,523)
Present value of unfunded defined benefit obligation	17,399	15,445
Net liability arising from defined benefit obligation	$ 41,622	$ 53,014

Disclosure of detailed infor114

Disclosure of detailed information about pension obligation (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Pension obligation - current	$ 19,401	$ 24,635
Pension obligation - non-current	22,221	28,379
Total pension obligation	$ 41,622	$ 53,014

Disclosure of detailed infor115

Disclosure of detailed information about pension expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Defined benefit pension expense	$ 10,132	$ 12,121
Defined contribution pension expense	2,443	1,061
Pension obligations [Member]
Statement [Line Items]
Current service cost	10,707	10,768
Past service cost and loss from settlements	10,442	0
Total service cost	21,149	10,768
Net interest expense	1,597	1,781
Administration cost	80	77
Defined benefit pension expense	22,826	12,626
Defined contribution pension expense	$ 908	$ 829

Disclosure of detailed infor116

Disclosure of detailed information about remeasurement on the net defined benefit liability (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Return on plan assets (excluding amounts included in net interest expense)	$ (24,437)	$ (2,905)
Actuarial gains arising from changes in demographic assumptions	1,598	0
Actuarial losses/(gains) arising from changes in financial assumptions	9,402	14,955
Actuarial gains arising from experience adjustments	(675)	(3,350)
Defined benefit loss/(gain) related to remeasurement	(14,112)	8,700
Total pension cost	$ 9,622	$ 22,155

Disclosure of defined benefit p

Disclosure of defined benefit plan, assumptions used (Details) - Pension obligations [Member]	Dec. 31, 2017	Dec. 31, 2016
Defined benefit cost [Member]
Statement [Line Items]
Expected rate of salary increase	2.75%	3.00%
Defined benefit cost [Member] | Males [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	20.9	20.8
Defined benefit cost [Member] | Females [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	23.3	23.3
Defined benefit cost [Member] | Benefit obligations [Member]
Statement [Line Items]
Discount rate	3.69%	4.08%
Defined benefit cost [Member] | Service cost [Member]
Statement [Line Items]
Discount rate	3.82%	4.25%
Defined benefit obligation [Member]
Statement [Line Items]
Discount rate	3.45%	3.69%
Expected rate of salary increase	2.75%	2.75%
Defined benefit obligation [Member] | Males [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	21	20.9
Average longevity at retirement age for current employees (future pensioners) (years)	22.9	22.2
Defined benefit obligation [Member] | Females [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	23.7	23.3
Average longevity at retirement age for current employees (future pensioners) (years)	25.5	24.5

Disclosure of fair value of pla

Disclosure of fair value of plan assets (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Plan assets, at fair value	$ 341,432	$ 296,151	$ 279,523
Level 1 [Member]
Statement [Line Items]
Plan assets, at fair value	120,652	125,618
Level 2 [Member]
Statement [Line Items]
Plan assets, at fair value	220,780	170,533
Level 3 [Member]
Statement [Line Items]
Plan assets, at fair value	0	0
Money market instruments [Member]
Statement [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	4,625	4,515
Money market instruments [Member] | Level 1 [Member]
Statement [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	4,625	4,515
Money market instruments [Member] | Level 2 [Member]
Statement [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0
Money market instruments [Member] | Level 3 [Member]
Statement [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0
Pooled equity funds [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	116,027	121,103
Pooled equity funds [Member] | Level 1 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	116,027	121,103
Pooled equity funds [Member] | Level 2 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled equity funds [Member] | Level 3 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled fixed income funds [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	189,964	143,489
Pooled fixed income funds [Member] | Level 1 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled fixed income funds [Member] | Level 2 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	189,964	143,489
Pooled fixed income funds [Member] | Level 3 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Alternative investment funds [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	30,699	26,404
Alternative investment funds [Member] | Level 1 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Alternative investment funds [Member] | Level 2 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	30,699	26,404
Alternative investment funds [Member] | Level 3 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Balanced funds [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	117	640
Balanced funds [Member] | Level 1 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Balanced funds [Member] | Level 2 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	117	640
Balanced funds [Member] | Level 3 [Member]
Statement [Line Items]
Investment funds, amount contributed to fair value of plan assets	$ 0	$ 0

Disclosure of additional inf119

Disclosure of additional information about other employee benefit plans (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Opening defined benefit obligation	$ 89,005	$ 80,259
Current service cost	2,614	2,579
Interest cost	3,567	3,367
Effects of movements in exchange rates	7,026	2,197
Arising from changes in demographic assumptions	1,172	0
Arising from changes in financial assumptions	6,761	2,712
Arising from experience adjustments	(120)	(160)
Benefits paid	(2,196)	(1,949)
Closing defined benefit obligation	$ 107,829	$ 89,005

Disclosure of additional inf120

Disclosure of additional information about other employee benefit plans, balance by member group (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Closing defined benefit obligation	$ 107,829	$ 89,005	$ 80,259
Inactive members [Member]
Statement [Line Items]
Closing defined benefit obligation	43,369	36,394
Active members [Member]
Statement [Line Items]
Closing defined benefit obligation	$ 64,460	$ 52,611

Disclosure of changes in fai121

Disclosure of changes in fair value of assets of other employee benefits plan (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Employer contributions	$ 2,196	$ 1,949
Benefits paid	(2,196)	(1,949)
Plan assets, at fair value	$ 0	$ 0

Disclosure of net benefit liabi

Disclosure of net benefit liability for other employee benefits (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Unfunded benefit obligation	$ 107,829	$ 89,005	$ 80,259
Vacation accrual and other - non-current	3,324	2,624
Net liability	$ 111,153	$ 91,629

Disclosure of detailed infor123

Disclosure of detailed information about other employee benefits plan (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Other employee benefits liability - current	$ 2,756	$ 2,356
Other employee benefits liability - non-current	108,397	89,273
Net liability	$ 111,153	$ 91,629

Disclosure of detailed infor124

Disclosure of detailed information about employee future benefit expense (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Current service cost	$ 2,614	$ 2,579
Net interest expense	3,567	3,367
Components recognized in income statements	$ 6,181	$ 5,946

Disclosure of detailed infor125

Disclosure of detailed information about remeasurement of other long term employee benefits (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Actuarial (gains)/losses arising from changes in demographic assumptions	$ 1,172	$ 0
Actuarial (gains)/losses arising from changes in financial assumptions	6,761	2,712
Actuarial gains arising from experience adjustments	(120)	(160)
Components recognized in statements of comprehensive income	7,813	2,552
Total other employee future benefit cost	$ 13,994	$ 8,498

Disclosure of other employee be

Disclosure of other employee benefit plan, assumptions used (Details) - Other employee benefits [Member]	Dec. 31, 2017	Dec. 31, 2016
Defined benefit cost [Member]
Statement [Line Items]
Discount rate	4.03%	4.19%
Defined benefit cost [Member] | Initial [Member]
Statement [Line Items]
Weighted average health care trend rate	6.13%	6.28%
Defined benefit cost [Member] | Ultimate [Member]
Statement [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit cost [Member] | Males [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	21.6	21.6
Defined benefit cost [Member] | Females [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	24.1	24
Defined benefit obligation [Member]
Statement [Line Items]
Discount rate	3.64%	4.03%
Defined benefit obligation [Member] | Initial [Member]
Statement [Line Items]
Weighted average health care trend rate	5.97%	6.13%
Defined benefit obligation [Member] | Ultimate [Member]
Statement [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit obligation [Member] | Males [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	21	21.6
Average longevity at retirement age for current employees (future pensioners) (years)	22.9	23
Defined benefit obligation [Member] | Females [Member]
Statement [Line Items]
Average longevity at retirement age for current pensioners (years)	23.7	24.1
Average longevity at retirement age for current employees (future pensioners) (years)	25.5	25.3

Disclosure of detailed infor127

Disclosure of detailed information about effective income tax expense recovery (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Current income tax expense (Canada)	$ 5,970	$ 7,000
Current income tax expense (Peru)	24,523	0
Current Mining Taxes (Canada)	4,744	1,309
Current Mining Taxes (Peru)	14,706	8,971
Current tax expense (income) and adjustments for current tax of prior periods	49,943	17,280
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Canada)	2,636	(24,013)
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Peru)	30,721	39,350
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (United States)	(46,908)	5,617
Deferred Canadian mining tax expense (income) relating to origination and reversal of temporary differences	467	3,739
Deferred Peruvian mining tax expense (income) relating to origination and reversal of temporary differences	(613)	(1,441)
Adjustments in respect of prior years	(1,417)	266
Deferred tax expense (income)	(15,114)	23,518
Tax expense (recovery)	$ 34,829	$ 40,798

Disclosure of deferred taxes (D

Disclosure of deferred taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Deferred income tax asset	$ 35,989	$ 79,483
Deferred income tax liability	(302,092)	(354,916)
Net deferred tax liability balance	(266,103)	(275,433)	$ (253,859)
Income tax effect of temporary differences [Member]
Statement [Line Items]
Deferred income tax asset	35,989	79,483
Deferred income tax liability	(285,210)	(338,330)
Net deferred tax liability balance	(249,221)	(258,847)
Income tax effect of temporary differences [Member] | Canada [Member]
Statement [Line Items]
Deferred income tax asset	35,989	79,483
Deferred income tax liability	0	(34,379)
Income tax effect of temporary differences [Member] | Peru [Member]
Statement [Line Items]
Deferred income tax liability	(177,519)	(149,351)
Income tax effect of temporary differences [Member] | United States [Member]
Statement [Line Items]
Deferred income tax liability	(107,691)	(154,600)
Mining tax effect of temporary differences recognized [Member] | Canada [Member]
Statement [Line Items]
Deferred income tax liability	(5,615)	(4,706)
Net deferred tax liability balance	(5,615)	(4,706)
Mining tax effect of temporary differences recognized [Member] | Peru [Member]
Statement [Line Items]
Deferred income tax liability	(11,267)	(11,880)
Net deferred tax liability balance	$ (11,267)	$ (11,880)

Disclosure of changes in def129

Disclosure of changes in deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Net deferred tax liability balance, beginning of period	$ (275,433)	$ (253,859)
Deferred income tax expense	15,032	(21,028)
Deferred mining tax expense	82	(2,490)
OCI transactions	(3,845)	2,198
Items charged directly to equity	2,238	0
Foreign currency translation on the deferred tax liability	(4,177)	(254)
Net deferred tax liability balance, end of year	$ (266,103)	$ (275,433)

Disclosure of reconciliation to

Disclosure of reconciliation to statutory tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Statutory tax rate	27.00%	27.00%
Tax expense at statutory rate	$ 53,656	$ 1,513
Effect of Deductions related to mining taxes	(6,075)	(3,223)
Adjusted income taxes	47,581	(1,710)
Mining tax expense (recovery)	19,367	12,771
Adjusted income tax expense after mining tax expense (recovery)	66,948	11,061
Permanent differences related to capital items	1,462	401
Permanent differences related to other income tax permanent differences	338	262
Impact of remeasurement on decommissioning liability	15,290	13,803
Temporary income tax differences not recognized	10,015	8,598
Impact related to differences in tax rates in foreign operations	4,605	2,250
Impact of changes to statutory tax rate	(52,855)	7,960
Foreign exchange on non-monetary items	(9,387)	(3,433)
Impact related to tax assessments and tax return amendments	(1,587)	(104)
Tax expense (recovery)	$ 34,829	$ 40,798

Disclosure of temporary differe

Disclosure of temporary differences recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Deferred income tax asset	$ 35,989	$ 79,483
Deferred income tax liability	302,092	354,916
Net deferred income tax liability	(266,103)	(275,433)	$ (253,859)
Property, plant and equipment [Member]
Statement [Line Items]
Deferred income tax asset	(102,053)	1,163
Deferred income tax (recovery) expense	103,216	(255)
Deferred income tax liability	313,581	417,060
Deferred income tax expense (recovery)	(103,479)	22,810
Pension obligation [Member]
Statement [Line Items]
Deferred income tax asset	10,034	942
Deferred income tax (recovery) expense	(12,937)	(215)
Deferred income tax liability	0	(12,150)
Deferred income tax expense (recovery)	12,150	4,556
Other employee benefits [Member]
Statement [Line Items]
Deferred income tax asset	16,742	2,972
Deferred income tax (recovery) expense	(13,770)	(1,471)
Deferred income tax liability	192	(14,806)
Deferred income tax expense (recovery)	14,998	(2,111)
Asset retirement obligations [Member]
Statement [Line Items]
Deferred income tax liability	(789)	(11,357)
Deferred income tax expense (recovery)	10,568	4,701
Non-capital losses [Member]
Statement [Line Items]
Deferred income tax asset	91,495	59,034
Deferred income tax (recovery) expense	(32,461)	(24,098)
Deferred income tax liability	(27,539)	(46,500)
Deferred income tax expense (recovery)	18,961	21,567
Share issue and debt costs [Member]
Statement [Line Items]
Deferred income tax asset	15,707	16,319
Deferred income tax (recovery) expense	2,850	(14,858)
Other [Member]
Statement [Line Items]
Deferred income tax asset	4,064	(947)
Deferred income tax (recovery) expense	(8,810)	2,084
Deferred income tax liability	(235)	6,083
Deferred income tax expense (recovery)	(6,318)	8,318
Income tax effect of temporary differences [Member]
Statement [Line Items]
Deferred income tax asset	35,989	79,483
Deferred income tax (recovery) expense	38,088	(38,813)
Deferred income tax liability	285,210	338,330
Deferred income tax expense (recovery)	(53,120)	59,841
Net deferred income tax liability	(249,221)	(258,847)
Net deferred income tax lexpense (recovery)	$ (15,032)	$ 21,028

Disclosure of temporary diff132

Disclosure of temporary differences not recognized (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Temporary differences not recognized	$ 613,495	$ 413,671
Property, plant and equipment [Member]
Statement [Line Items]
Temporary differences not recognized	32,089	16,690
Capital losses [Member]
Statement [Line Items]
Temporary differences not recognized	223,916	109,670
Other employee benefits [Member]
Statement [Line Items]
Temporary differences not recognized	78,871	52,093
Asset retirement obligations [Member]
Statement [Line Items]
Temporary differences not recognized	174,448	135,481
Non-capital losses [Member]
Statement [Line Items]
Temporary differences not recognized	$ 104,171	$ 99,737

Disclosure of temporary diff133

Disclosure of temporary differences - deferred mining tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Net deferred income tax liability	$ (266,103)	$ (275,433)	$ (253,859)
Mining tax effect of temporary differences recognized [Member] | Canada [Member]
Statement [Line Items]
Net deferred income tax liability	(5,615)	(4,706)
Mining tax effect of temporary differences recognized [Member] | Peru [Member]
Statement [Line Items]
Net deferred income tax liability	$ (11,267)	$ (11,880)

Disclosure of detailed infor134

Disclosure of detailed information about shares, activity explanatory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Beginning Balance	$ 1,763,212	$ 1,787,290
Equity issuance	195,295
Share issue costs, net of tax	(6,205)	(95)
Ending Balance	$ 2,144,255	$ 1,763,212
Share capital [Member]
Statement [Line Items]
Number of shares issued and fully paid, beginning balance	237,271,188	235,231,688
Beginning Balance	$ 1,588,319	$ 1,576,600
Equity issuance (shares)	24,000,000	2,039,500
Equity issuance	$ 195,295	$ 11,814
Share issue costs, net of tax (shares)	0	0
Share issue costs, net of tax	$ (6,205)	$ (95)
Number of shares issued and fully paid, ending balance	261,271,188	237,271,188
Ending Balance	$ 1,777,409	$ 1,588,319

Disclosure of number and weight

Disclosure of number and weighted average exercise prices of other equity instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017CAD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016CAD ($)
Deferred Share Unit [Member]
Statement [Line Items]
Number of units granted during the year	130,964	130,964	231,867	231,867
Weighted average price (C$/unit)		$ 8.59		$ 5.81
Expenses (recovery) recognized during the year related to the grant of deferred share units, as well as mark-to-market adjustments	$ 2,982		$ 2,111
Payments made during the year	$ 638		$ 1,078
Restricted Share Unit [Member]
Statement [Line Items]
Number of restricted share units, beginning of year	3,492,408	3,492,408	1,943,507	1,943,507
Number of units granted during the year	987,194	987,194	2,576,957	2,576,957
Credits for dividends	8,156	8,156	14,776	14,776
Number of units forfeited during the year	(201,946)	(201,946)	(133,329)	(133,329)
Number of units vested	(880,099)	(880,099)	(909,503)	(909,503)
Number of restricted share units, end of year	3,405,713	3,405,713	3,492,408	3,492,408
Weighted average price (C$/unit)		$ 10.60		$ 4.01
Expenses (recovery) recognized during the year related to the grant of deferred share units, as well as mark-to-market adjustments	$ 12,937		$ 7,776
Payments made during the year	$ 5,491		$ 2,736

Disclosure of number and wei136

Disclosure of number and weighted average exercise prices of share options (Details)	12 Months Ended
	Dec. 31, 2017CAD ($)	Dec. 31, 2016CAD ($)
Statement [Line Items]
Number of shares subject to option, beginning of year	1,470,377	1,904,185
Weighted average exercise price of share options outstanding in share-based payment arrangement, beginning of year	$ 19.24	$ 17.57
Number of shares subject to option, forfeited	(20,002)	(125,677)
Weighted average exercise price of options forfeited	$ 15.86	$ 17.52
Number of shares subject to option, expired	(927,023)	(308,131)
Weighted average exercise price of options expired	$ 21.22	$ 9.70
Number of shares subject to option, end of year	523,352	1,470,377
Weighted average exercise price of share options outstanding in share-based payment arrangement, end of year	$ 15.86	$ 19.24

Disclosure of range of exercise

Disclosure of range of exercise prices of outstanding share options (Details)	Dec. 31, 2017CAD ($)	Dec. 31, 2016CAD ($)	Dec. 31, 2015CAD ($)
Statement [Line Items]
Exercise price of options	$ 15.86
Number of options outstanding	523,352	1,470,377	1,904,185
Weighted average remaining contractual life (years)	0.2
Weighted average exercise price (options outstanding)	$ 15.86	$ 19.24	$ 17.57
Number of options exercisable	523,352
Weighted average exercise price (options exercisable)	$ 15.86
15.86 - 18.33 [Member]
Statement [Line Items]
Number of options outstanding		543,354
Weighted average remaining contractual life (years)		1.2
Weighted average exercise price (options outstanding)		$ 15.86
Number of options exercisable		543,354
Weighted average exercise price (options exercisable)		$ 15.86
15.86 - 18.33 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		15.86
15.86 - 18.33 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 18.33
18.34 - 21.28 [Member]
Statement [Line Items]
Number of options outstanding		757,023
Weighted average remaining contractual life (years)		0.2
Weighted average exercise price (options outstanding)		$ 20.80
Number of options exercisable		757,023
Weighted average exercise price (options exercisable)		$ 20.80
18.34 - 21.28 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		18.34
18.34 - 21.28 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 21.28
21.29 - 21.98 [Member]
Statement [Line Items]
Number of options outstanding		10,000
Weighted average remaining contractual life (years)		0.1
Weighted average exercise price (options outstanding)		$ 21.75
Number of options exercisable		10,000
Weighted average exercise price (options exercisable)		$ 21.75
21.29 - 21.98 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		21.29
21.29 - 21.98 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 21.98
21.29 - 22.97 [Member]
Statement [Line Items]
Number of options outstanding		60,000
Weighted average remaining contractual life (years)		0.9
Weighted average exercise price (options outstanding)		$ 22.20
Number of options exercisable		60,000
Weighted average exercise price (options exercisable)		$ 22.20
21.29 - 22.97 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		21.99
21.29 - 22.97 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 22.97
22.98 - 23.74 [Member]
Statement [Line Items]
Number of options outstanding		100,000
Weighted average remaining contractual life (years)		0.6
Weighted average exercise price (options outstanding)		$ 23.74
Number of options exercisable		100,000
Weighted average exercise price (options exercisable)		$ 23.74
22.98 - 23.74 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		22.98
22.98 - 23.74 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 23.74
15.86 - 23.74 [Member]
Statement [Line Items]
Number of options outstanding		1,470,377
Weighted average remaining contractual life (years)		0.6
Weighted average exercise price (options outstanding)		$ 19.24
Number of options exercisable		1,470,377
Weighted average exercise price (options exercisable)		$ 19.24
15.86 - 23.74 [Member] | Bottom of range [Member]
Statement [Line Items]
Exercise price of options		15.86
15.86 - 23.74 [Member] | Top of range [Member]
Statement [Line Items]
Exercise price of options		$ 23.74

Earnings per share (Details)

Earnings per share (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Basic & diluted weighted average common shares outstanding	243,500,696	235,807,509

Disclosure of fair value measur

Disclosure of fair value measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Cash and cash equivalents	$ 356,499	$ 146,864	$ 53,852
Trade and other receivables - embedded derivatives	17,427	12,538
Non-hedge derivative assets	2,841	3,397
Prepayment option - embedded derivative	3,980	4,430
Investments at FVTPL	282	192
Available-for-sale investments	21,973	13,508
Other financial liabilities	47,561	41,838
Embedded derivatives	1,533	86
Warrant liabilities	6,961	7,588
Option liabilities	732	570
Non-hedge derivative liabilities	16,140	10,682
Fair value [Member]
Statement [Line Items]
Cash and cash equivalents	356,499	146,864
Restricted cash	206	17,148
Trade and other receivables	142,199	116,445
Trade and other receivables - embedded derivatives	17,427	12,538
Non-hedge derivative assets	2,841	3,397
Prepayment option - embedded derivative	3,980	4,430
Investments at FVTPL	282	192
Available-for-sale investments	21,973	13,508
Total financial assets	545,407	314,522
Trade and other payables	192,448	163,027
Finance leases	84,573	12,932
Other financial liabilities	19,625	17,231
Senior unsecured notes	1,082,740	1,040,178
Equipment finance facility	0	50,267
Senior secured revolving credit facilities	0	202,075
Unamortized transaction costs	(8,328)	(6,752)
Embedded derivatives	1,533	86
Warrant liabilities	6,961	7,588
Option liabilities	732	570
Non-hedge derivative liabilities	16,140	10,682
Total financial liabilities	1,396,424	1,497,884
Net financial liability	(851,017)	(1,183,362)
Carrying amount [Domain]
Statement [Line Items]
Cash and cash equivalents	356,499	146,864
Restricted cash	206	17,148
Trade and other receivables	142,199	116,445
Trade and other receivables - embedded derivatives	17,427	12,538
Non-hedge derivative assets	2,841	3,397
Prepayment option - embedded derivative	3,980	4,430
Investments at FVTPL	282	192
Available-for-sale investments	21,973	13,508
Total financial assets	545,407	314,522
Trade and other payables	192,448	163,027
Finance leases	84,573	12,932
Other financial liabilities	22,568	22,998
Senior unsecured notes	991,883	991,004
Equipment finance facility	0	50,267
Senior secured revolving credit facilities	0	202,075
Unamortized transaction costs	(8,328)	(6,752)
Embedded derivatives	1,533	86
Warrant liabilities	6,961	7,588
Option liabilities	732	570
Non-hedge derivative liabilities	16,140	10,682
Total financial liabilities	1,308,510	1,454,477
Net financial liability	$ (763,103)	$ (1,139,955)

Disclosure of significant unobs

Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Embedded derivatives	$ 17,427	$ 12,538
Non-hedge derivatives	2,841	3,397
Investments at FVTPL	282	192
Prepayment option embedded derivative	3,980	4,430
Available-for-sale investments	21,973	13,508
Financial assets measured at fair value	46,503	34,065
Embedded derivatives	1,533	86
Non-hedge derivatives	16,140	10,682
Option liability	732	570
Warrant liabilities	6,961	7,588
Financial liabilities measured at fair value	25,366	18,926
Level 1 [Member]
Statement [Line Items]
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Investments at FVTPL	0	0
Prepayment option embedded derivative	0	0
Available-for-sale investments	21,973	12,018
Financial assets measured at fair value	21,973	12,018
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Option liability	0	0
Warrant liabilities	6,961	7,588
Financial liabilities measured at fair value	6,961	7,588
Level 2 [Member]
Statement [Line Items]
Embedded derivatives	17,427	12,538
Non-hedge derivatives	2,841	3,397
Investments at FVTPL	282	192
Prepayment option embedded derivative	3,980	4,430
Available-for-sale investments	0	0
Financial assets measured at fair value	24,530	20,557
Embedded derivatives	1,533	86
Non-hedge derivatives	16,140	10,682
Option liability	732	570
Warrant liabilities	0	0
Financial liabilities measured at fair value	18,405	11,338
Level 3 [Member]
Statement [Line Items]
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Investments at FVTPL	0	0
Prepayment option embedded derivative	0	0
Available-for-sale investments	0	1,490
Financial assets measured at fair value	0	1,490
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Option liability	0	0
Warrant liabilities	0	0
Financial liabilities measured at fair value	$ 0	$ 0

Disclosure of detailed infor141

Disclosure of detailed information about foreign currency risk (Details) S/ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017CAD ($)	Dec. 31, 2017PEN (S/)	Dec. 31, 2016USD ($)	Dec. 31, 2016CAD ($)	Dec. 31, 2016PEN (S/)	Dec. 31, 2015USD ($)
Statement [Line Items]
Cash and cash equivalents	$ 356,499			$ 146,864			$ 53,852
Other financial assets	25,302			34,245
Other financial liabilities	(47,561)			(41,838)
Currency risk [Member]
Statement [Line Items]
Cash and cash equivalents	20,597	$ 9,518	S/ 3,692	8,121	$ 4,759	S/ 3,440
Trade and other receivables	77,824	530	1,114	28,639	720	2,503
Other financial assets	0	22,255	0	0	13,279	0
Trade and other payables	(9,687)	(6,115)	(17,917)	(4,303)	(20,014)	(17,145)
Other financial liabilities	0	(6,961)	(22,568)	0	(7,588)	(22,998)
Net financial liability	$ 88,734	$ 19,227	S/ (35,679)	$ 32,457	$ (8,844)	S/ (34,200)

Disclosure of foreign currency

Disclosure of foreign currency risk (Details) - Currency risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
USD / CAD exchange rate [Member]
Statement [Line Items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 5.6	$ 3.9
Effect of variance increase on other comprehensive income	(2)	1.2
Effect of variance decrease on after-tax profit	(6.8)	4.9
Effect of variance decrease on other comprehensive income	$ 2.4	$ 1.5
USD / PEN exchange rate [Member]
Statement [Line Items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 2.1	$ 2
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(2.6)	2.5
Effect of variance decrease on other comprehensive income	$ 0	$ 0

Disclosure of commodity price r

Disclosure of commodity price risk (Details) - Commodity price risk [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Copper prices [Member]
Statement [Line Items]
Sensitivity analysis, variance, price	$ 0.30	$ 0.30
Effect of variance increase on after-tax profit	(2,300,000)	(4,800,000)
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	2,300,000	4,700,000,000,000
Effect of variance decrease on other comprehensive income	0	0
Zinc prices [Member]
Statement [Line Items]
Sensitivity analysis, variance, price	0.10	0.10
Effect of variance increase on after-tax profit	900,000	300,000,000,000
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(900,000)	(0.3)
Effect of variance decrease on other comprehensive income	$ 0	$ 0

Disclosure of share price risk

Disclosure of share price risk explanatory (Details) - Share price risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Sensitivity analysis, variance, percentage	25.00%	25.00%
Effect of variance increase on after-tax profit	$ 0	$ 0
Effect of variance increase on other comprehensive income	5.5	4,500,000
Effect of variance decrease on after-tax profit	(1.9)	(800,000)
Effect of variance decrease on other comprehensive income	$ (3.6)	$ (3,700,000)

Disclosure of interest rate ris

Disclosure of interest rate risk (Details) - Interest rate risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Sensitivity analysis, variance, percentage	2.00%	2.00%
Effect of variance increase on after-tax profit	$ 0.4	$ (5,000,000)
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(2.8)	700,000
Effect of variance decrease on other comprehensive income	$ 0	$ 0

Disclosure of liquidity risk (D

Disclosure of liquidity risk (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement [Line Items]
Cash and cash equivalents	$ 356,499	$ 146,864	$ 53,852
Non-hedge derivative assets	2,841	3,397
Other financial liabilities	(47,561)	(41,838)
Long-term debt, including prepayment option embedded derivative	(979,575)	(1,232,164)
Warrant liabilities	(6,961)	(7,588)
Derivative financial liabilities	(16,140)	(10,682)
12 months or less
Statement [Line Items]
Cash and cash equivalents	356,499	146,864
Trade and other receivables	124,134	96,221
Non-hedge derivative assets	2,841	3,397
Assets used to manage liquidity risk	483,474	246,482
Trade and other payables, including embedded derivative	(192,821)	(163,113)
Other financial liabilities	(3,824)	(4,025)
Long-term debt, including prepayment option embedded derivative	(79,715)	(105,278)
Finance lease liabilities	(20,186)	(3,508)
Non-derivative financial liabilities	(296,546)	(275,924)
Warrant liabilities	(6,961)	0
Gold option	(732)	0
Non-hedge derivative contracts	(15,263)	(10,682)
Derivative financial liabilities	(22,956)	(10,682)
13-36 months [Member]
Statement [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables	12,403	1,543
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	12,403	1,543
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(4,791)	(3,303)
Long-term debt, including prepayment option embedded derivative	(159,430)	(105,278)
Finance lease liabilities	(40,253)	(3,338)
Non-derivative financial liabilities	(204,474)	(111,919)
Warrant liabilities	0	0
Gold option	0	0
Non-hedge derivative contracts	(877)	0
Derivative financial liabilities	(877)	0
37-60 months
Statement [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables	10,659	18,681
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	10,659	18,681
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(4,780)	(4,616)
Long-term debt, including prepayment option embedded derivative	(152,396)	(544,957)
Finance lease liabilities	(29,311)	(6,874)
Non-derivative financial liabilities	(186,487)	(556,447)
Warrant liabilities	0	(7,588)
Gold option	0	(570)
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	(8,158)
More than 60 months [Member]
Statement [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables	0	0
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	0	0
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(23,821)	(23,448)
Long-term debt, including prepayment option embedded derivative	(1,128,875)	(1,191,412)
Finance lease liabilities	0	0
Non-derivative financial liabilities	(1,152,696)	(1,214,860)
Warrant liabilities	0	0
Gold option	0	0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
Carrying amount [Member]
Statement [Line Items]
Cash and cash equivalents	356,499	146,864
Trade and other receivables	142,199	116,445
Non-hedge derivative assets	2,841	3,397
Assets used to manage liquidity risk	501,539	266,706
Trade and other payables, including embedded derivative	(192,821)	(163,113)
Other financial liabilities	(22,568)	(22,998)
Long-term debt, including prepayment option embedded derivative	(979,575)	(1,232,164)
Finance lease liabilities	(84,573)	(12,932)
Non-derivative financial liabilities	(1,279,537)	(1,431,207)
Warrant liabilities	(6,961)	(7,588)
Gold option	(732)	(570)
Non-hedge derivative contracts	(16,140)	(10,682)
Derivative financial liabilities	(23,833)	(18,840)
Contractual cash flows [Member]
Statement [Line Items]
Cash and cash equivalents	356,499	146,864
Trade and other receivables	147,196	116,445
Non-hedge derivative assets	2,841	3,397
Assets used to manage liquidity risk	506,536	266,706
Trade and other payables, including embedded derivative	(192,821)	(163,113)
Other financial liabilities	(37,216)	(35,392)
Long-term debt, including prepayment option embedded derivative	(1,520,416)	(1,946,925)
Finance lease liabilities	(89,750)	(13,720)
Non-derivative financial liabilities	(1,840,203)	(2,159,150)
Warrant liabilities	(6,961)	(7,588)
Gold option	(732)	(570)
Non-hedge derivative contracts	(16,140)	(10,682)
Derivative financial liabilities	$ (23,833)	$ (18,840)

Disclosure of maturity analysis

Disclosure of maturity analysis of operating lease payments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 19,754	$ 18,639
Minimum lease payments	4,972	4,575
Total payments recognized in operating expenses	4,972	4,575
Within one year [Member]
Statement [Line Items]
Minimum lease payments payable under non-cancellable operating lease	5,682	5,591
After one year but not more than five years [Member]
Statement [Line Items]
Minimum lease payments payable under non-cancellable operating lease	12,291	12,606
More than five years [Member]
Statement [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 1,781	$ 442

Disclosure of subsidiaries (Det

Disclosure of subsidiaries (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
HudBay Marketing & Sales Inc. [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru Inc. [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru S.A.C. [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay (BVI) Inc. [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Arizona Corporation [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
Rosemont Copper Company [Member]
Statement [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%

Disclosure of information about

Disclosure of information about key management personnel (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Short-term employee benefits	$ 8,654	$ 8,470
Post-employment benefits	777	594
Long-term share-based awards	6,110	5,479
Total key management personnel compensation	$ 15,541	$ 14,543

Disclosure of detailed infor150

Disclosure of detailed information about supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Trade and other receivables	$ (8,979)	$ 68,270
Other financial assets/liabilities	6,620	19,181
Inventories	(18,690)	2,653
Prepaid expenses and other current assets	(4,619)	3,646
Trade and other payables	(6,336)	(8,339)
Changes in taxes payable/receivable	39,326	3,666
Other	1,693	(1,871)
Increase (decrease) in working capital	$ 9,015	$ 87,206

Disclosure of geographical area

Disclosure of geographical areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Revenue from external customers	$ 1,362,553	$ 1,128,678
Mine operating costs	695,728	607,170
Depreciation and amortization	292,880	298,630
Gross Profit	373,945	222,878
Selling and administrative expenses	42,283	37,774
Exploration and evaluation expenses	15,474	4,742
Other operating expenses	(12,440)	10,586
Asset impairment	11,320	0
Results from operating activities	317,308	169,776
Finance income	(2,849)	(2,792)
Finance expenses	103,028	167,071
Other finance losses	18,401	(108)
Profit before tax	198,728	5,605
Tax expense (recovery)	34,829	40,798
Profit (Loss)	163,899	(35,193)
Manitoba [Member]
Statement [Line Items]
Revenue from external customers	704,777	512,671
Mine operating costs	392,863	318,037
Depreciation and amortization	118,770	120,531
Gross Profit	193,144	74,103
Selling and administrative expenses	0	0
Exploration and evaluation expenses	5,649	1,228
Other operating expenses	(56)	5,490
Asset impairment	11,320
Results from operating activities	176,231	67,385
Peru [Member]
Statement [Line Items]
Revenue from external customers	657,776	616,007
Mine operating costs	302,865	289,133
Depreciation and amortization	174,110	178,099
Gross Profit	180,801	148,775
Selling and administrative expenses	0	0
Exploration and evaluation expenses	1,442	1,262
Other operating expenses	(6,612)	7,790
Asset impairment	0
Results from operating activities	185,971	139,723
Arizona [Member]
Statement [Line Items]
Revenue from external customers	0	0
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross Profit	0	0
Selling and administrative expenses	0	0
Exploration and evaluation expenses	0	0
Other operating expenses	517	618
Asset impairment	0
Results from operating activities	(517)	(618)
Corporate and other activities [Member]
Statement [Line Items]
Revenue from external customers	0	0
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross Profit	0	0
Selling and administrative expenses	42,283	37,774
Exploration and evaluation expenses	8,383	2,252
Other operating expenses	(6,289)	(3,312)
Asset impairment	0
Results from operating activities	$ (44,377)	$ (36,714)

Disclosure of geographical a152

Disclosure of geographical areas, assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Total assets	$ 4,648,729	$ 4,456,556
Total liabilities	2,504,474	2,693,344
Property, plant and equipment	3,880,894	3,865,823
Manitoba [Member]
Statement [Line Items]
Total assets	743,019	769,561
Total liabilities	525,515	528,326
Property, plant and equipment	619,476	606,348
Peru [Member]
Statement [Line Items]
Total assets	2,666,775	2,720,441
Total liabilities	806,217	876,056
Property, plant and equipment	2,420,561	2,452,917
Arizona [Member]
Statement [Line Items]
Total assets	856,589	822,498
Total liabilities	110,945	158,236
Property, plant and equipment	836,759	800,542
Corporate and other activities [Member]
Statement [Line Items]
Total assets	382,346	144,056
Total liabilities	1,061,797	1,130,726
Property, plant and equipment	$ 4,098	$ 6,016

Disclosure of geographical a153

Disclosure of geographical areas, additions to property, plant and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Additions to property, plant and equipment	$ 259,815	$ 216,885
Manitoba [Member]
Statement [Line Items]
Additions to property, plant and equipment	97,936	65,521
Peru [Member]
Statement [Line Items]
Additions to property, plant and equipment	143,372	125,489
Arizona [Member]
Statement [Line Items]
Additions to property, plant and equipment	18,507	25,856
Corporate and other activities [Member]
Statement [Line Items]
Additions to property, plant and equipment	$ 0	$ 19

Disclosure of geographical a154

Disclosure of geographical areas, revenue by customer location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Statement [Line Items]
Revenue from external customers	$ 1,362,553	$ 1,128,678
Canada [Member]
Statement [Line Items]
Revenue from external customers	421,247	372,439
United States [Member] (UnitedStatesMember)
Statement [Line Items]
Revenue from external customers	236,467	146,419
Switzerland [Member]
Statement [Line Items]
Revenue from external customers	159,085	256,377
Germany [Member]
Statement [Line Items]
Revenue from external customers	144,684	39,703
China [Member]
Statement [Line Items]
Revenue from external customers	145,935	139,200
Peru [Member]
Statement [Line Items]
Revenue from external customers	101,033	68,964
Philippines [Member]
Statement [Line Items]
Revenue from external customers	120,199	70,933
Other [Member]
Statement [Line Items]
Revenue from external customers	$ 33,903	$ 34,643