Hudbay Minerals (HBM) 40-F 1 Apr 19 2018 FY Annual report (Canada) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2018shares
Document and Entity Information [Abstract]
Entity Registrant Name	Hudbay Minerals Inc.
Entity Central Index Key	0001322422
Trading Symbol	hbm
Entity Current Reporting Status	Yes
Document Type	40-F
Document Period End Date	Dec. 31, 2018
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Common Stock, Shares Outstanding	261,272,151
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Current assets
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864
Trade and other receivables	117,153	155,522	152,567
Inventories	118,474	141,682	112,464
Prepaid expenses and other current assets	8,894	8,995	3,992
Other financial assets	10,366	2,841	3,397
Taxes receivable	2,008	3	17,319
Total Current assets	772,392	665,542	436,603
Receivables	39,121	32,459	32,648
Inventories	19,476	5,809	4,537
Other financial assets	15,159	22,461	30,848
Intangible assets - computer software	4,162	5,575	6,614
Property, plant and equipment	3,819,812	3,964,233	3,953,752
Deferred tax assets	15,513	31,937	40,162
Total Assets	4,685,635	4,728,016	4,505,164
Current liabilities
Trade and other payables	171,952	199,117	169,662
Taxes payable	5,508	10,794	4,419
Other liabilities	30,551	51,962	42,207
Other financial liabilities	12,425	26,760	13,495
Finance lease obligations	20,472	18,327	3,172
Long term debt			16,490
Deferred revenue	86,256	107,194	87,411
Total Current liabilities	327,164	414,154	336,856
Other financial liabilities	18,771	20,801	28,343
Finance lease obligations	53,763	66,246	9,760
Long term debt	981,030	979,575	1,215,674
Deferred revenue	479,822	494,736	528,835
Provisions	204,648	200,138	179,702
Pension obligations	23,863	22,221	28,379
Other employee benefits	93,628	108,397	89,273
Deferred tax liabilities	324,090	309,403	328,263
Total liabilities	2,506,779	2,615,671	2,745,085
Equity
Share capital	1,777,340	1,777,409	1,588,319
Reserves	(41,254)	(26,463)	(53,633)
Retained earnings	442,770	361,399	225,393
Total equity	2,178,856	2,112,345	1,760,079
Total liabilities and equity	$ 4,685,635	$ 4,728,016	$ 4,505,164

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash generated from (used in) operating activities:
Profit for the year	$ 85,416	$ 139,692
Tax expense	85,421	33,219
Items not affecting cash:
Depreciation and amortization	333,144	297,825
Share- based payment (recoveries) expenses	(2,373)	15,919
Net finance expense	143,550	166,593
Change in fair value of derivatives	(1,514)	1,790
Amortization of deferred revenue	(93,382)	(88,744)
Change in taxes receivable/payable, net	(7,881)	(39,326)
Unrealized (gain) on warrants	(6,748)	(1,051)
(Gain) loss on investments	3,798	(3,511)
Pension and other employee benefit payments, net of accruals	(94)	3,142
Asset impairment losses		11,320
Other and foreign exchange	(8,571)	4,310
Taxes paid	(37,295)	(10,617)
Operating cash flow before change in non-cash working capital	493,471	530,561
Change in non-cash working capital	(13,919)	9,015
Net cash flows from (used in) operating activities	479,552	539,576
Cash generated from (used in) investing activities:
Acquisition of property, plant and equipment	(190,899)	(249,763)
Net sale (purchase) of investments	53	(2,245)
Acquisition of Mason	(19,050)
Proceeds from disposition of property, plant and equipment	4,224
Change in restricted cash	(3,196)	16,854
Net interest received	6,732	890
Net cash flows from (used in) investing activities	(202,136)	(234,264)
Cash generated from (used in) financing activities:
Long term borrowing		25,000
Principal repayments		(281,439)
Interest paid on long-term debt	(74,750)	(52,743)
Financing costs	(20,564)	(26,597)
Sale leaseback		67,275
Payment of finance lease	(20,926)	(7,509)
Net proceeds from equity transactions	(69)	186,852
Dividends paid	(4,045)	(3,686)
Net cash flows from (used in) financing activities	(120,354)	(92,847)
Effect of movement in exchange rates on cash and cash equivalents	1,936	(2,830)
Net increase in cash and cash equivalents	158,998	209,635
Cash and cash equivalents, beginning of the year	356,499	146,864
Cash and cash equivalents, end of the year	$ 515,497	$ 356,499

Consolidated Income Statements

Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement
Revenue	$ 1,472,366	$ 1,402,339
Cost of sales
Mine operating costs	765,959	695,728
Depreciation and amortization	332,667	297,470
Cost of Sales	1,098,626	993,198
Gross profit	373,740	409,141
Selling and administrative expenses	27,243	42,283
Exploration and evaluation expenses	28,570	15,474
Other operating expenses (income)	19,071	(12,440)
Asset impairment loss		11,320
Results from operating activities	298,856	352,504
Finance income	(8,450)	(2,849)
Finance expenses	152,000	169,442
Other finance (gain) losses	(15,531)	13,000
Net finance expense	128,019	179,593
Profit before tax	170,837	172,911
Tax expense	85,421	33,219
Profit for the year	$ 85,416	$ 139,692
Earnings per share Basic and diluted	$ 0.33	$ 0.57
Weighted average number of common shares outstanding (note 25):
Basic and Diluted	261,271,621	243,500,696

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Income and Comprehensive Income
Profit for the year	$ 85,416	$ 139,692
Item that will be reclassified subsequently to profit or loss:
Net exchange (loss) gain on translation of foreign currency balances	(24,371)	21,695
Total other comprehensive income that will be reclassified to profit or loss, net of tax	(24,371)	21,695
Items that will not be reclassified subsequently to profit or loss:
Remeasurement - actuarial gain	9,060	6,299
Tax effect	520	(3,845)
Total other comprehensive income that will not be reclassified to profit or loss, net of tax	9,580	2,454
Transferred to income statement:
Wind up of subsidiaries		3,021
Other comprehensive (loss) income net of tax, for the year	(14,791)	27,170
Total comprehensive income for the year	$ 70,625	$ 166,862

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Share capital [Member]	Other capital reserves [Member]	Foreign currency translation reserve [Member]	Remeasurement reserve [Member]	Retained earnings [Member]	Total
Beginning Balance at Jan. 01, 2017	$ 1,588,319	$ 28,837	$ (12,164)	$ (70,306)	$ 225,393	$ 1,760,079
Statements [Line Items]
Profit (Loss)					139,692	139,692
Other comprehensive (loss) income:			24,716	2,454		27,170
Total comprehensive (loss) income			24,716	2,454	139,692	166,862
Contributions by and distributions to owners:
Equity issuance	195,295					195,295
Share issue costs, net of tax	(6,205)					(6,205)
Warrants exercised	0
Dividends					(3,686)	(3,686)
Total contributions by and distributions to owners	189,090				(3,686)	185,404
Ending Balance at Dec. 31, 2017	1,777,409	28,837	12,552	(67,852)	361,399	2,112,345
Statements [Line Items]
Profit (Loss)					85,416	85,416
Other comprehensive (loss) income:			(24,371)	9,580		(14,791)
Total comprehensive (loss) income			(24,371)	9,580	85,416	70,625
Contributions by and distributions to owners:
Equity issuance	0
Share issue costs, net of tax	(80)					(80)
Warrants exercised	11					11
Dividends					(4,045)	(4,045)
Total contributions by and distributions to owners	(69)				(4,045)	(4,114)
Ending Balance at Dec. 31, 2018	$ 1,777,340	$ 28,837	$ (11,819)	$ (58,272)	$ 442,770	$ 2,178,856

Reporting entity

Reporting entity	12 Months Ended
	Dec. 31, 2018
Statements [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, 2018 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 primarily producing copper concentrate (containing copper, gold and silver), molybdenum 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 three polymetallic mines, four ore concentrators and a zinc production facility in northern Manitoba and Saskatchewan (Canada) and Cusco (Peru) and copper projects in Arizona and Nevada (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.

Basis of preparation

Basis of preparation	12 Months Ended
	Dec. 31, 2018
Statements [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, 2018. The Board of Directors approved these consolidated financial statements on February 19, 2019. (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, and financial assets measured at fair value through profit or loss ("FVTPL"); – 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 critical and significant judgements and estimates impacting the consolidated financial statements: – Indicators and testing of impairment (reversal of impairment) of non-financial assets – IFRS 15 - Revenue - adoption for stream transactions – 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; – the carrying value of deferred tax assets; and – the amortization of deferred revenue. – 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. – Acquisition method accounting – Tax provisions – Assaying utilized to determine revenue and recoverability of inventories – Decommissioning and restoration obligations – Pensions and other employee benefits

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2018
Statements [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 issuance 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 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. Revenue from the sale of by-products is included within revenue. Sales revenue is recognized when control of the goods sold has been transferred to the buyer. Control is deemed to have passed to the customer when significant risk and reward of the product has passed to the buyer, Hudbay has a present right to payment and physical possession of the product has been transferred to the buyer. Sale of concentrate and finished zinc frequently occur under the following terms, and management has assessed these terms in order to determine timing of transfer of control. Incoterms used by Hudbay Revenue recognized when goods: Cost, Insurance and Freight (CIF) Are loaded on board the vessel Free on Board (FOB) Are loaded on board the vessel Delivered at place (DAP) Arrive at the named place of destination Delivered at terminal (DAT) Arrive at the named place of destination Free Carrier (FCA) Arrive at the named place of delivery 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 achieved, using weight and assay results and forward market prices to estimate the fair value of the total consideration receivable. Therefore, revenue is initially recorded based on an initial provisional invoice. Subsequently, at each reporting date, until the provisionally priced sale is finalized, sales receivables are marked to market, with adjustments (both gains and losses) recorded within revenue separately as “Pricing and volume adjustments” in the notes to the consolidated financial statements and in trade and other receivables on the consolidated balance sheets. As per IFRS 15 Revenue, variability in price is deemed to be fair value movements on provisionally priced receivables under the scope of IFRS 9 Financial Instruments; variability in quantities is deemed to be variable consideration. The variable consideration from weights and assay changes to quantities has been assessed to be insignificant to warrant precluding revenue being recorded as a result of possible future sales reversals. An annual analysis of the accuracy of our weights and assays is completed, and if the accuracy rate falls below a certain threshold, management may record a provision due to a high risk of a significant revenue reversal. The Group only includes in the transaction price an amount which is not highly likely to be subject to significant subsequent revenue reversal. Within sales contracts with customers, separate performance obligations may arise pertaining to the shipping of goods sold. Where significant, costs and the transaction price are allocated on a relative stand alone selling basis to any separate performance obligations and are recognized over the period of time the goods sold are shipped, on a gross basis. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. There is a significant financing component associated with the Group's precious metal streaming arrangements since funds were received in advance of the delivery of concentrate. When a significant financing component is recognized, finance expense will be higher and revenues will be higher as the larger deferred revenue balance is amortized to revenues. A market-based discount rate is utilized at the inception of each of the respective stream agreements to determine a discount rate for computing the interest charges for the significant financing component of the deferred revenue balance. As product is delivered, the deferred revenue amount including accreted interest will be drawn down. The draw down rate requires the use of proven and probable reserves and certain resources in the calculation that are beyond proven and probable reserves which management is reasonably confident are transferable to reserves. Key estimates used in determining the significant financing component include the discount rate and the reserve and resources assumed for conversion. (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 greenfield exploration and evaluation assets. The Group allocates near mine exploration and evaluation assets to CGUs based on their operating segment, geographic location and management’s intended use for the property. Near mine exploration and evaluation assets are allocated to CGUs separate from those containing producing or development-phase assets, except where such 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

New standards

New standards	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
New standards [Text Block]	4. New standards New standards and interpretations adopted (a) IFRS 9, Financial Instruments (“IFRS 9”) and IFRS 15, Revenue from Contracts with Customers (“IFRS 15”) Issued on July 24, 2014, IFRS 9 is the IASB’s replacement of IAS 39, Financial Instruments: Recognition and Measurement. The standard includes requirements for recognition and measurement, impairment, derecognition and general hedge accounting. The IASB completed its project to replace IAS 39 in phases, adding to the standard as it completed each phase. The version of IFRS 9 issued in 2014 supersedes all previous versions and is mandatorily effective for periods beginning on or after January 1, 2018 with early adoption permitted. The Group finalized its determination of the effect of adoption of IFRS 9 on its consolidated financial statements starting with March 31, 2018: – Investments previously classified as Available for Sale (“AFS”) investments are no longer measured at FVTOCI. Under IFRS 9, they are measured at FVTPL. Retrospectively, the accumulated OCI reserve balance is closed to retained earnings, resulting in an opening retained earnings adjustment. The change in fair value of the investments is restated and recognized as finance income/expense retrospectively and going forward. A line item within finance income and expenses called “Change in the fair value of financial assets and liabilities at fair value through profit or loss: Investments” was utilized for changes in fair value of the investments. The restatement caused an increase to previously reported retained 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 were restated and re-classified to the “Change in the fair value of financial assets and liabilities at fair value through profit or loss: Investments” line item. There was no impact to earnings as a result of this. – The embedded derivatives within our provisionally priced sales receivables are no longer bifurcated from the accounts receivable recorded; therefore, both are presented together on the balance sheets, and provisionally priced sales receivables are recorded at FVTPL. – An expected credit loss model is used to impair any financial assets measured at amortized cost when material. No material impacts were noted. 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 finalized its determination of the effect of adoption of IFRS 15 on its consolidated financial statements starting with March 31, 2018. Metal revenue not subject to precious metals stream contracts – The Group does not have any 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 occurred as a result of separate performance obligations. – The Group has disclosed revenue generated from changes in mark-to-market of its provisionally priced sales separately from revenue from contracts. This has created 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 transactions. The Group’s deferred revenue balance associated with stream transactions was increased to reflect interest accretion since initial recognition of the transactions due to the recognition of a significant financing component on existing streaming transactions. The increased deferred revenue balance increases the realized deferred revenue per unit of metal sold pursuant to the stream transactions. – As a result of the above change to the accounting for stream contracts, adjustments to previously reported periods caused 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. – For the Peru segment, the interest accretion of the deferred revenue balance during the site’s precommercial phase has been capitalized. This has resulted in an increase to Property, Plant & Equipment, net of impairment adjustments related to changes in the Peru cash generating unit’s carrying value resulting from the restatement. The Group applied these standards on January 1, 2018 retrospectively. Changes to previously reported balances are disclosed in Note 4(c). (b) IFRIC Interpretation 22, Foreign Currency Transactions and Advance Consideration (“IFRIC 22”) IFRIC 22 provides requirements about which exchange rate to use in reporting foreign currency transactions (such as revenue transactions) when payment is made or received in advance. The Interpretations Committee concluded that the exchange rate should be the rate used to initially measure the non- monetary asset (prepaid asset) or liability (deferred credit) when the advance was made. If there were multiple advances, each receipt or payment would be measured at the date the non-monetary asset or liability is recognized. This interpretation is effective for annual periods beginning on or after January 1, 2018, is consistent with the Group’s existing policies, and therefore did not have any effect on the Group’s financial results. (c) New standards adopted - Impact Summary Consolidated Balance Sheet January 1, 2017 As reported IFRS 9 IFRS 15 Restated Property, plant and equipment $ 3,865,823 - $ 87,929 $ 3,953,752 Deferred tax assets 1 45,103 - (4,941 ) 40,162 Deferred revenue (current) 65,619 - 21,792 87,411 Deferred revenue (non-current) 472,233 - 56,602 528,835 Deferred tax liabilities 1 320,536 - 7,727 328,263 Reserves (42,040 ) (5,025 ) (6,568 ) (53,633 ) Retained Earnings 216,933 5,025 3,435 225,393 1 December 31, 2017 As reported IFRS 9 IFRS 15 Restated Property, plant and equipment $ 3,880,894 - $ 83,339 $ 3,964,233 Deferred tax assets 35,989 - (4,052 ) 31,937 Deferred revenue (current) 49,907 - 57,287 107,194 Deferred revenue (non-current) 448,137 - 46,599 494,736 Deferred tax liabilities 302,092 - 7,311 309,403 Reserves (10,300 ) (10,424 ) (5,739 ) (26,463 ) Retained Earnings 377,146 10,424 (26,171 ) 361,399 Consolidated Income Statement Twelve Months Ended December 31, 2017 As reported IFRS 9 IFRS 15 Restated Revenue $ 1,362,553 $ — $ 39,786 $ 1,402,339 Depreciation and amortization 292,880 — 4,590 297,470 Finance expenses 103,028 — 66,414 169,442 Other finance loss 18,401 (5,401 ) — 13,000 Profit before tax 198,728 5,401 (31,218 ) 172,911 Tax expense 34,829 — (1,610 ) 33,219 Profit for the year 163,899 5,401 (29,608 ) 139,692 Other comprehensive income for the year 31,740 (5,401 ) 831 27,170 Earnings (loss) per share - Basic and diluted 0.67 0.02 (0.12 ) 0.57 Consolidated Statement of Cash Flow Twelve Months Ended December 31, 2017 As reported IFRS 9 IFRS 15 Restated Profit for the period $ 163,899 $ 5,401 $ (29,608 ) $ 139,692 Tax expense 34,829 - (1,610 ) 33,219 Depreciation and amortization 293,235 - 4,590 297,825 Net finance expense 100,179 - 66,414 166,593 Change in deferred revenue related to stream (48,958 ) - (39,786 ) (88,744 ) Gain on investments at FVTPL - (3,511 ) - (3,511 ) Loss on available-for-sale investments 1,970 (1,970 ) - - Other and foreign exchange 4,230 80 - 4,310 New standards and interpretations not yet adopted (d) 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 the modified retrospective approach. Early adoption is permitted, but only in conjunction with IFRS 15, Revenue from Contracts with Customers. 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, which will cause, with limited exceptions, most leases to be recorded ‘on balance sheet’. Hudbay has selected the modified retrospective approach as a result of the non-significant impact expected to the financial statements. The Company is currently quantifying the effect of this standard on the financial statements. During the fourth quarter, the Company continued its scoping of contracts across its operations and continued a detailed review of contracts. The Company also continued to develop calculation methodologies and draft financial statement disclosures. On the transition date of January 1, 2019, the Company expects to recognize additional leases on the consolidated balance sheet, which will increase finance lease obligations and property, plant and equipment balances. As a result of recognizing additional finance lease obligations, the expected impact is a reduction in cost of sales, as operating lease expense will be replaced by depreciation expense and finance expense.

Acquisition of Mason

Acquisition of Mason	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements [Abstract]
Acquisition of Mason	5. Acquisition of Mason On December 19, 2018, the Group acquired the remaining issued and outstanding shares it did not already own of Mason Resources Corp. (“Mason”) for C$0.40 per share, which resulted in a cash purchase price of C$27,972 (C$27,070 plus transaction costs of C$902). Hudbay already owned 13.8% of the issued and outstanding shares, which had a market value of C$4,342 on the date of acquisition. In accordance with IFRS 3, Business Combinations, this transaction does not meet the definition of a business combination as the assets acquired are not an integrated set of activities with inputs, processes and outputs. Mason is a company that is engaged in the exploration and development of mineral resource properties (and, in particular, the Ann Mason project) in the United States. There is currently no development or operations in existence. The purchase price was finalized and allocated to the assets acquired based on the fair value of the total consideration at the closing date of the acquisition. All financial assets acquired were recorded at their relative fair values. The fair values of mineral properties have been calculated using the residual value method. The fair values of various cash and working capital amounts were subtracted from the acquisition cost to determine the residual value for the mineral properties. Immediately prior to the acquisition, Mason settled its outstanding in the money stock options and warrants in cash under the terms of the arrangement agreement. The following summarizes the acquisition date fair value of the major classes of consideration transferred: USD CAD equivalent Cash $ 20,126 $ 27,070 Transaction costs 671 902 Total cash consideration 20,797 27,972 Fair value of shares previously owned by the Group (10,854,170 shares) 3,228 4,342 Total consideration $ 24,025 $ 32,314 The following summarizes the acquisition date allocation of the relative fair values of the major classes of asset and liabilities acquired: Fair value Cash $ 1,747 Other assets 624 Mineral properties 21,654 Total assets acquired $ 24,025

Revenue and expenses

Revenue and expenses	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Revenue and expenses [Text Block]	6. Revenue and expenses (a) Revenue The Group’s revenue by significant product types: Year ended December 31, 2018 2017 (Restated) Copper $ 963,063 $ 927,029 Zinc 357,396 347,680 Gold 149,043 137,326 Silver 85,808 76,850 Molybdenum 20,995 9,381 Other 4,726 4,992 1,581,031 1,503,258 Pricing and volume adjustments 1 (6,756 ) 5,147 1,574,275 1,508,405 Treatment and refining charges (101,909 ) (106,066 ) $ 1,472,366 $ 1,402,339 1 Pricing and volume adjustments represent mark-to-market adjustments on initial estimate of provisionally priced sales, realized and unrealized changes to fair value for non-hedge derivative contracts and adjustments to originally invoiced weights and assays. (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, 2018 2017 (Restated) Cost of sales $ 332,667 Selling and administrative expenses 477 355 $ 333,144 (c) Share-based payment expenses (recoveries) Share-based payment expenses (recoveries) are reflected in the consolidated income statements as follows: Cash-settled RSUs DSUs Total share-based (note 24a) (note 24a) payment expense Year ended December 31, 2018 Cost of sales $ 160 $ — $ 160 Selling and administrative (702 ) (1,877 ) (2,579 ) Other operating 46 — 46 $ (496 ) $ (1,877 ) $ (2,373 ) Year ended December 31, 2017 Cost of sales $ 1,946 $ — $ 1,946 Selling and administrative 9,667 2,982 12,649 Other operating 1,324 — 1,324 $ 12,937 $ 2,982 $ 15,919 (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, 2018 2017 Current employee benefits $ 176,571 $ 147,760 Profit-sharing plan expense 9,228 19,757 Share-based payments (notes 6c, 19, 24) Cash-settled restricted share units (496 ) 12,937 Cash-settled deferred share units (1,877 ) 2,982 Employee share purchase plan 1,533 1,328 Post-employee pension benefits Defined benefit plans 12,295 10,132 Defined contribution plans 1,511 2,443 Past service costs 383 10,442 Other post-retirement employee benefits 9,248 7,250 Termination benefits 1,206 419 $ 209,602 $ 215,450 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 20 for a description of the Group's pension plans and note 21 for the Group's other employee benefit plans. (e) Other operating income and expenses Year ended December 31, 2018 2017 Regional costs $ 4,673 $ 4,308 Pampacancha delivery obligation 7,218 — Pension settlement loss (note 20) 2,163 — Constancia insurance recovery — (12,857 ) Realized gain on contingent consideration of Balmat — (6,400 ) Loss on disposals and other 5,017 2,509 $ 19,071 ) During the fourth quarter of 2018, the Group realized a loss on the settlement of the sale of a portion of its net pension liability. During the first quarter of 2018, the Group recognized an obligation to deliver additional precious metal credits to Wheaton Precious Metals (“Wheaton”) as a result of the Group’s expectation that mining at the Pampacancha deposit will not begin until later in 2019. During the first and third quarters of 2017, the Group accounted for amounts to be received 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. These funds were received during 2017. 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, 2018 2017 (Restated) Finance income $ (8,450 ) $ (2,849 ) Finance expenses Interest expense on long-term debt 77,783 87,819 Accretion on financial liabilities at amortized cost 1,244 1,302 Finance costs on deferred revenue (note 18) 64,921 66,414 Unwinding of discounts on provisions (note 19) 4,684 4,159 Withholding taxes 9,424 9,641 Other finance expense 7,116 13,256 165,172 182,591 Interest capitalized (13,172 ) (13,149 ) 152,000 169,442 Other finance (gains) losses Net foreign exchange (gains) losses (11,067 ) 15,772 Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants (6,748 ) (1,051 ) Embedded derivatives (1,514 ) 1,790 Investments 3,798 (3,511 ) (15,531 ) 13,000 Net finance expense and other finance losses $ 128,019 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 fees on the Group’s revolving credit facilities and finance leases. (g) Impairment For the year ended December 31, 2018, the Group recorded no impairment losses. During the year ended December 31, 2017, the Group recorded impairment losses of $11,320 for non- current assets. Manitoba Pre-tax impairment to: Property, plant & equipment (note 12) $ 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 31. The fair value measurements for the determination of the 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, 2018
Statements [Line Items]
Cash and cash equivalents [text block]	7. Cash and cash equivalents Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Cash on hand and demand deposits $ 515,497 $ 356,499 $ 129,850 Short-term money market instruments with maturities of of three months or less at acquisition date — — 17,014 $ 515,497 $ 356,499 $ 146,864

Trade and other receivables

Trade and other receivables	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Trade and other receivables [text block]	8. Trade and other receivables Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Trade receivables $ 102,112 $ 97,924 Statutory receivables 12,764 13,961 43,808 Receivable from joint venture partners 245 2,808 — Other receivables 2,032 2,271 10,835 117,153 155,522 152,567 Non-current Taxes receivable 17,199 14,394 12,424 Receivable from joint venture partners 20,404 16,414 18,681 Other receivables 1,518 1,651 1,543 39,121 32,459 32,648 $ 156,274 $ 185,215 As at December 31, 2018, $11,670 (December 31, 2017 and January 1, 2017 - $10,905 and $42,273, respectively) of the current statutory receivables related 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 from the Group’s joint venture partner for the Rosemont project in Arizona.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Inventories [text block]	9. Inventories Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Stockpile $ 5,463 $ 13,468 $ 9,368 Work in progress 1,762 14,552 9,100 Finished goods 62,546 71,906 54,583 Materials and supplies 48,703 41,756 39,413 118,474 141,682 112,464 Non-current Stockpile 14,730 — — Materials and supplies 4,746 5,809 4,537 19,476 5,809 4,537 $ 137,950 $ 147,491 $ 117,001 The cost of inventories recognized as an expense, including depreciation, and included in cost of sales amounted to $975,354 for the year ended December 31, 2018 (year ended December 31, 2017 - $855,141).

Other financial assets

Other financial assets	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Other financial assets [text block]	10. Other financial assets Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Current Derivative assets $ 6,628 $ 2,841 $ 3,397 Restricted cash 3,738 — — $ 10,366 $ 2,841 $ 3,397 Non-current Investments at fair value through profit or loss 15,159 22,255 13,700 Restricted cash — 206 17,148 15,159 22,461 30,848 $ 25,525 $ 25,302 $ 34,245 Investments at fair value through profit or loss consist of securities in Canadian metals and mining companies, all of which are publicly traded. The change in investments at fair value through profit or loss is mostly attributed to fluctuation in market price, foreign exchange impact and net disposals.

Intangible assets - computer so

Intangible assets - computer software	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Intangible assets - computer software [text block]	11. Intangible assets - computer software Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Cost Balance, beginning of year $ 19,169 $ 16,998 $ 16,179 Additions 590 1,203 407 Effects of movement in exchange rates (1,202 ) 968 412 Balance, end of year 18,557 19,169 16,998 Accumulated amortization Balance, beginning of year 13,594 10,384 7,320 Additions 1,793 2,541 2,882 Effects of movement in exchange rates (992 ) 669 182 Balance, end of year 14,395 13,594 10,384 Net book value $ 4,162 $ 5,575 $ 6,614

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Property, plant and equipment [text block]	12. Property, plant and equipment Exploration and evaluation Capital works Mining Plant and Dec. 31, 2018 assets in progress properties equipment Total Balance, beginning of year (Restated) $ 23,010 $ 933,531 $ 1,975,061 $ 2,536,019 $ 5,467,621 Additions 9,950 88,920 — 16,689 115,559 Acquisitions (note 5) 21,654 — — — 21,654 Capitalized stripping and development — — 84,023 — 84,023 Decommissioning and restoration — 15 1,711 7,272 8,998 Interest capitalized — 13,172 — — 13,172 Transfers and other movements — (152,781 ) 2,132 150,649 — Disposals (1,208 ) (4,034 ) — (9,749 ) (14,991 ) Effects of movements in exchange rates (1,197 ) (3,873 ) (65,434 ) (62,757 ) (133,261 ) Other (3 ) (1,169 ) 946 224 (2 ) Balance, end of year 52,206 873,781 1,998,439 2,638,347 5,562,773 Accumulated depreciation Balance, beginning of year (Restated) — — 683,183 820,205 1,503,388 Depreciation for the year — — 141,218 189,354 330,572 Disposals — — — (6,780 ) (6,780 ) Effects of movement in exchange rates — — (43,469 ) (40,211 ) (83,680 ) Other — — (178 ) (361 ) (539 ) Balance, end of year — — 780,754 962,207 1,742,961 Net book value $ 52,206 $ 873,781 $ 1,217,685 $ 1,676,140 $ 3,819,812 Exploration and evaluation Capital works Mining Plant and Dec. 31, 2017 assets in progress properties equipment Total Balance, beginning of year (Restated) $ 15,015 $ 844,759 $ 1,852,705 $ 2,385,995 $ 5,098,474 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 (note 6g) — (11,320 ) — — (11,320 ) Disposals — (13 ) (1,600 ) (9,586 ) (11,199 ) Effects of movements in exchange rates 995 2,955 49,184 47,553 100,687 Other — 6,814 85 455 7,354 Balance, end of year (Restated) 23,010 933,531 1,975,061 2,536,019 5,467,621 Accumulated depreciation Balance, beginning of year (Restated) — — 529,242 615,480 1,144,722 Depreciation for the year (Restated) — — 122,444 183,452 305,896 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 (Restated) — — 683,183 820,205 1,503,388 Net book value (Restated) $ 23,010 $ 933,531 $ 1,291,878 $ 1,715,814 $ 3,964,233 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 intangibles 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 6b for amounts recognized in the consolidated income statements. For non-financial assets, management examined internal and external indicators of impairment or reversals. Management calculated a market capitalization deficiency as at December 31, 2018, which is an indicator of impairment. The impairment indicator as at December 31, 2018 was related to carrying values being higher than market capitalization for successive quarters during 2018. As such, management determined that a detailed impairment evaluation as at December 31, 2018 was required for the Arizona CGU and Peru CGU. For the impairment test, FVLCD was used to determine the recoverable amount since it is higher than value in use. FVLCD was calculated using discounted after-tax cash flows based on cash flow projections and assumptions in the Group’s most current LOM plans. The fair value measurement in its entirety is categorized as Level 3 based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value. LOM plans are based on optimized mine and processing plans and the assessment of capital expenditure requirements of a mine site. LOM plans incorporate management’s best estimates of key assumptions which are discount rates, future commodity prices, production based on current estimates of recoverable reserves, future operating and capital costs, value of mineral resources not included in the LOM plan and future foreign exchange rates. The cash flows are for periods up to the date that production is expected to cease, which is 18 years for the Peru CGU and 22 years for the Arizona CGU. The Arizona CGU production cash flows are expected to commence in three years. The discount rate was based on the CGU’s weighted average cost of capital, of which the two main components are the cost of equity and the after-tax cost of debt. Cost of equity was calculated based on the capital asset pricing model, incorporating the risk-free rate of return based on the US Government’s marketable bond yields as at the valuation date, the Company’s beta coefficient adjustment to the market equity risk premium based on the volatility of the Company’s return in relation to that of a comparable market portfolio, plus a country risk premium, size premium and company-specific risk factor. Cost of debt was determined by applying an appropriate market indication of the Company’s borrowing capabilities and the corporate income tax rate applicable to the segment’s jurisdiction. A real discount rate of 6.25% (December 31, 2016 - 7.50%) for the Peru CGU and 7.50% (December 31, 2016 - 8.75%) for the Arizona CGU was used to calculate the estimated after-tax discounted future net cash flows, commensurate with its individual estimated level of risk. Commodity prices used in the impairment assessment were determined by reference to external market participant sources. The key commodity price for this assessment is the price of copper. Where applicable to each of the Group’s CGUs, the cash flow calculations were based on estimates of future production levels applying forecasts for metal prices, which included forecasts for each year from 2019 to 2022 and long-term forecasts for years beginning in 2023. The cash flow calculations utilized a copper price of $3.00/lb in 2019, $3.10/lb in 2020 and $3.20/lb in 2021 and 2022. The cash flow calculations utilized a long-term copper price of $3.10/lb (December 31, 2016 - $3.00/lb), molybdenum long-term prices of $11.00/lb (December 31, 2016 - $11.00/lb), and capital, operating and reclamation costs based on the most current LOM plans. For the Peru and Arizona CGUs, a value of $237,500 and $287,900 (December 31, 2015 - $272,000 and $212,000, respectively), respectively, was utilized to estimate the value of mineral resources not included in the LOM plan. Expected future cash flows used to determine the FVLCD used in the impairment testing are inherently uncertain and could materially change over time. Should management’s estimate of the future not reflect actual events, impairments may be identified. This may have a material effect on the Company’s consolidated financial statements. Although it is reasonably possible for a change in key assumptions to occur, the possible effects of a change in any single assumption may not fairly reflect the impact on a CGU’s fair value as the assumptions are inextricably linked. For example, a decrease in the assumed price of long-term copper could result in amendments to the mine plans which would partially offset the effect of lower prices. It is difficult to determine how all of these factors would interrelate; however, in deriving a recoverable amount, management believes all of these factors need to be considered. As at December 31, 2018, the estimated recoverable amounts of the Peru and Arizona CGUs exceeded their carrying amount, consequently no impairment was required. For the Peru CGU, a decrease of 10% in the average LOM copper price or a 1.0 percentage point increase in the real discount rate, in isolation of each other, would result in a decrease in FVLCD of $368 million or $105 million, respectively (December 31, 2016 - $381 million or $143 million, respectively). As at December 31, 2018, the difference between the FVLCD and the CGUs carrying value tested was $165 million for the Peru CGU (December 31, 2016 - $75 million).

Trade and other payables

Trade and other payables	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Trade and other payables [text block]	13. Trade and other payables Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Trade payables $ 61,395 $ 71,336 $ 80,509 Accruals and payables 68,386 86,078 78,154 Accrued interest 34,662 34,848 4,300 Exploration and evaluation payables 185 186 64 Embedded derivatives - provisional pricing (note 27c) — 373 86 Statutory payables 7,324 6,296 6,549 $ 171,952 $ 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, 2018
Statements [Line Items]
Other liabilities [text block]	14. Other liabilities Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Provisions (note 19) $ 14,276 $ 27,370 $ 14,367 Pension liability (note 20) 11,854 19,401 24,635 Other employee benefits (note 21) 2,564 2,756 2,356 Unearned revenue 1,857 2,435 849 $ 30,551 $ 51,962 $ 42,207

Other financial liabilities

Other financial liabilities	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Other financial liabilities [Text Block]	15. Other financial liabilities Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Derivative liabilities $ 2,634 $ 16,140 $ 10,682 Warrants at fair value through profit or loss — 6,961 — Contingent consideration - gold price option — 732 — Other financial liabilities at amortized cost 2,590 2,630 2,813 Embedded derivatives (note 27c) 7,201 297 — 12,425 26,760 13,495 Non-current Contingent consideration - gold price option — — 570 Warrants at fair value through profit or loss — — 7,588 Other financial liabilities at amortized cost 18,771 19,938 20,185 Embedded derivatives (note 27c) — 863 — 18,771 20,801 28,343 $ 31,196 $ 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. The fair value adjustments for hedging type derivatives are recorded in revenue. Fair value adjustments for contract derivatives, warrants and the gold option derivatives are recorded 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 22,391,490 warrants were issued which entitled the holders 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. As at December 31, 2018, all warrants had either been exercised or expired. 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 was equal to or above $1,400/oz on May 4, 2018. The option represented a financial liability and was recorded at fair value at the acquisition date of New Britannia and was remeasured at each reporting date with the change in the fair value being recognized as unrealized gains or losses in finance income and expense. This option expired, unexercised, on May 4, 2018.

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Long-term debt [text block]	17. Long- term debt Long-term debt is comprised of the following: Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Senior unsecured notes (a) $ 989,306 $ 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) (8,276 ) (8,328 ) (6,752 ) 981,030 979,575 1,232,164 Less: current portion - - (16,490 ) $ 981,030 $ 979,575 $ 1,215,674 (a) Senior unsecured notes Balance, January 1, 2017 $ 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 Change in fair value of embedded derivative (prepayment option) 316 Accretion of transaction costs and premiums 1,087 Balance, December 31, 2018 $ 989,306 The $1,000,000 aggregate principal amount of senior notes are comprised of 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, 2017 $ 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 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, 2017 $ 202,075 Addition to Principal 25,000 Payments made (227,075 ) Balance, December 31, 2017 $ — On June 15, 2018, the Group entered into amendments to its two senior credit facilities to extend the maturity dates from July 14, 2021 to July 14, 2022 and to incorporate various amendments to the terms and conditions of the facilities to provide greater flexibility. The two facilities have substantially similar terms and conditions. As at December 31, 2018, the South American business unit had $77,567 in letters of credit issued under the Peru facility to support its reclamation obligations and the Manitoba business unit had $50,973 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 senior credit facilities, no cash collateral is required to be posted. (d) Unamortized transaction costs - revolving credit facilities Balance, January 1, 2017 $ 6,752 Accretion of transaction costs (3,291 ) Transaction costs 4,867 Balance, December 31, 2017 $ 8,328 Accretion of transaction costs (1,946 ) Transaction costs 1,894 Balance, December 31, 2018 $ 8,276

Finance lease obligations

Finance lease obligations	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Finance lease obligations [text block]	16. Finance lease obligations Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Total minimum lease payments $ 78,174 $ 89,750 $ 13,720 Effect of discounting (3,939 ) (5,177 ) (788 ) Present value of minimum lease payments 74,235 84,573 12,932 Less: current portion (20,472 ) (18,327 ) (3,172 ) 53,763 66,246 9,760 Minimum payments under finance leases Less than 12 months $ 18,448 20,186 3,508 13 - 36 months 40,615 40,253 6,667 37 - 60 months 19,111 29,311 3,545 $ 78,174 $ 89,750 $ 13,720 The Group has entered into equipment leases for its South American and Manitoba business units which expire between 2020 and 2023 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.

Deferred revenue

Deferred revenue	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Deferred revenue [text block]	18. 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 LOM plans. The Group estimates the current portion of deferred revenue based on deliveries anticipated over the next twelve months. In February 2010, Augusta Resource Corporation entered into a precious metals stream transaction with Wheaton whereby the Group will receive deposit payments of $230,000 against delivery of approximately 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. With the implementation of IFRS 15 as of January 1, 2018, the Group has determined that precious metals stream contracts are subject to variable consideration and contain a significant financing component. As such, the Company now recognizes a financing charge at each reporting period and will gross up the deferred revenue balance to recognize the significant financing element that is part of these contracts. The Group expects that the remaining performance obligations for the 777 and Constancia streams will be settled by the expiry of their respective stream agreements, which is no earlier than 2036. The Group restated prior year comparative information to reflect the impact of the adoption of this standard in the Company’s annual financial statements. The following table summarizes changes in deferred revenue: Balance, January 1, 2017 (Restated) $ 616,246 Recognition of revenue (88,744 ) Finance costs 66,414 Effects of changes in foreign exchange 8,014 Balance, December 31, 2017 (Restated) $ 601,930 Amortization of deferred revenue Liability drawdown (96,038 ) Variable consideration adjustment 2,656 Finance costs (note 6f) 64,921 Effects of changes in foreign exchange (7,391 ) Balance, December 31, 2018 $ 566,078 Consideration from the Company's stream agreement is considered variable. Gold and silver revenue can be subject to cumulative adjustments when the number of ounces to be delivered under the contract changes. During the year ended December 31, 2018, the Company recognized an adjustment to gold and silver revenue and finance costs due to an increase in the Company's reserve and resource estimates. Deferred revenue is reflected in the consolidated balance sheets as follows: Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Current $ 86,256 $ 107,194 $ 87,411 Non-current 479,822 494,736 528,835 $ 566,078 $ 601,930 $ 616,246

Provisions

Provisions	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Provisions [text block]	19. Provisions Decommis- sioning, Restricted restoration Deferred share and similar share units units 1 liabilities (note 24a ) (note 24a ) Other Total Balance, January 1, 2018 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 Net additional provisions made 9,031 973 7,493 — 17,497 Amounts used (188 ) — (6,435 ) (770 ) (7,393 ) Unwinding of discount (note 6f) 4,684 — — — 4,684 Effect of change in discount rate (462 ) — — — (462 ) Effect of foreign exchange (11,082 ) (458 ) (973 ) (74 ) (12,587 ) Effect of change in share price — (2,850 ) (7,293 ) (180 ) (10,323 ) Balance, December 31, 2018 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 1 Certain amounts relating to the Arizona segment are capitalized. Provisions are reflected in the consolidated balance sheets as follows: Decommis- sioning, Restricted restoration Deferred share and similar share units units 1 December 31, 2018 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 1,234 $ 4,288 $ 8,412 $ 342 $ 14,276 Non-current 200,790 — 3,789 69 204,648 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 liabilities (note 24a ) (note 24a ) 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 6f) 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: Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 December 31, 2017 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 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 1 January 1, 2017 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 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, 2018 additional provisions were recognized as a result of increased mine activity footprints and the resulting higher disturbance at the Constancia operation. 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. The Group's decommissioning and restoration liabilities relate mainly to its Manitoba operations. Management anticipates that the assets in Flin Flon will be placed on care and maintenance once mining activities are completed at 777 mine in order to maintain optionality for restart should a new mine be found in the Flin Flon area. The majority of closure activities will occur once all mining activities in Manitoba are completed, which is currently anticipated in 2028. 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 2070, which include ongoing monitoring and water treatment requirements. These estimates have been discounted to their present value at rates ranging from 1.80% to 3.02% per annum (2017 - 1.43% to 2.74%), 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, 2018
Statements [Line Items]
Pension obligations [Text Block]	20. 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 2018 using data as at December 31, 2017. For these plans, the next actuarial valuation required for funding purposes will be performed during 2019 using data as at December 31, 2018. During the year ended December 31, 2018, an annuity purchase transaction was entered into in which the defined benefit obligations associated with certain defined benefit plan members were assumed by a third party insurer in exchange for a lump sum payment of $120,018 from plan assets. Movements in the present value of the defined benefit obligation in the current and previous years were as follows: Year ended Dec. 31, 2018 Dec. 31, 2017 Opening defined benefit obligation: $ 383,054 $ 349,165 Current service costs 11,032 10,707 Past service cost related to the new collective bargaining agreement 383 10,442 Interest cost 12,009 12,602 Benefits paid from plan (29,499 ) (33,721 ) Benefits paid from employer (1,998 ) (999 ) Participant contributions 98 93 Effects of movements in exchange rates (32,015 ) 24,440 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions — 1,598 Arising from changes in financial assumptions (11,585 ) 9,402 Arising from experience adjustments (2,112 ) (675 ) Settlement payments from plan assets (120,018 ) — Loss on settlement (note 6e) 2,163 — Closing defined benefit obligation $ 211,512 $ 383,054 The defined benefit obligation closing balance, by member group, is as follows: Dec. 31, 2018 Dec. 31, 2017 Jan 1, 2017 Active members $ 200,591 $ 250,965 $ 235,815 Deferred members 723 4,304 3,636 Retired members 10,198 127,785 109,714 Closing defined benefit obligation $ 211,512 $ 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 Dec. 31, 2018 Dec. 31, 2017 Opening fair value of plan assets: $ 341,432 $ 296,151 Interest income 11,033 11,005 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) (15,296 ) 24,437 Contributions from the employer 17,020 22,484 Employer direct benefit payments 1,998 999 Contributions from plan participants 98 93 Benefit payment from employer (1,998 ) (999 ) Administrative expenses paid from plan assets (83 ) (80 ) Benefits paid (29,499 ) (33,721 ) Settlement payments from plan assets (120,018 ) — Effects of changes in foreign exchange rates (28,892 ) 21,063 Closing fair value of plan assets $ 175,795 $ 341,432 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, 2018 Dec. 31, 2017 Jan. 1, 2017 Present value of funded defined benefit obligation $ 195,283 $ 365,655 $ 333,720 Fair value of plan assets (175,795 ) (341,432 ) (296,151 ) Present value of unfunded defined benefit obligation 16,229 17,399 15,445 Net liability arising from defined benefit obligation $ 35,717 $ 41,622 $ 53,014 Reflected in the consolidated balance sheets as follows: Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Pension obligation - current (note 14) $ 11,854 $ 19,401 $ 24,635 Pension obligation - non-current 23,863 22,221 28,379 Total pension obligation $ 35,717 $ 41,622 $ 53,014 Pension expense is as follows: Dec. 31, 2018 Dec. 31, 2017 Service costs: Current service cost $ 11,032 $ 10,707 Past service cost 383 10,442 Loss on settlement (note 6e) 2,163 — Total service cost 13,578 21,149 Net interest expense 976 1,597 Administration cost 83 80 Defined benefit pension expense $ 14,637 $ 22,826 Defined contribution pension expense $ 1,469 $ 908 Remeasurement on the net defined benefit liability: Dec. 31, 2018 Dec. 31, 2017 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ 15,296 $ (24,437 ) Actuarial gains arising from changes in demographic assumptions — 1,598 Actuarial losses/(gains) arising from changes in financial assumptions (11,585 ) 9,402 Actuarial gains arising from experience adjustments (2,112 ) (675 ) Defined benefit loss/(gain) related to remeasurement $ 1,599 $ (14,112 ) Total pension cost $ 17,705 $ 9,622 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: 2018 2017 Defined benefit cost: Discount rate - benefit obligations 3.45% 3.69% Discount rate - service cost 3.50% 3.82% 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 Defined benefit obligation: Discount rate 3.73% 3.45% Expected rate of salary increase 1 2.75% 2.75% Average longevity at retirement age for current pensioners (years) 2 Males 21.1 21.0 Females 23.9 23.7 Average longevity at retirement age for current employees (future pensioners) (years) 2 Males 23.0 22.9 Females 25.6 25.5 1 Plus merit and promotional scale based on member's age 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 by $16,427 (increase by $18,686). – If the expected salary growth increases (decreases) by 1%, the defined benefit obligation would increase by $2,927 (decrease $2,610). – If the life expectancy increases (decreases) by one year for both men and women, the defined benefit obligation would increase by $1,705 (decrease by $1,764). 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, 2019 is $15,066. The average duration of the pension obligation at December 31, 2018 is 17.3 years (2017 – 15.8 years). This number can be broken down as follows: – Active members: 17.6 years (2017: 18.4 years) – Deferred members: 14.0 years (2017: 26.9 years) – Retired members: 10.4 years (2017: 10.2 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 2018 was negative 2.6% (2017: 11.5%) . 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, 2018 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 3,072 $ — $ — $ 3,072 Pooled equity funds 53,329 — — 53,329 Pooled fixed income funds — 91,854 — 91,854 Alternative investment funds — 26,871 — 26,871 Balanced funds — 669 — 669 $ 56,401 $ 119,394 $ — $ 175,795 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 January 1, 2017 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, 2018
Statements [Line Items]
Other employee benefits [text block]	21. 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: Year ended Dec. 31, 2018 Dec. 31, 2017 Opening defined benefit obligation $ 107,829 $ 89,005 Current service cost 1 3,455 2,614 Past service cost 255 — Interest cost 3,683 3,567 Effects of movements in exchange rates (8,587 ) 7,026 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions (9,996 ) 1,172 Arising from changes in financial assumptions 2,809 6,761 Arising from experience adjustments (3,472 ) (120 ) Benefits paid (2,448 ) (2,196 ) Closing defined benefit obligation $ 93,528 $ 107,829 1 Includes remeasurement of other long term employee benefits The defined benefit obligation closing balance, by group member, is as follows: Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Active members $ 47,249 $ 64,460 $ 52,611 Inactive members 46,279 43,369 36,394 Closing defined benefit obligation $ 93,528 $ 107,829 $ 89,005 Movements in the fair value of defined benefit amounts in the current and previous years were as follows: Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Employer contributions $ 2,448 $ 2,196 $ 1,949 Benefits paid (2,448 ) (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, 2018 Dec. 31, 2017 Jan 1, 2017 Unfunded benefit obligation $ 93,528 $ 107,829 $ 89,005 Vacation accrual and other - non-current 2,664 3,324 2,624 Net liability $ 96,192 $ 111,153 $ 91,629 Reflected in the consolidated balance sheets as follows: Dec. 31, 2018 Dec. 31, 2017 Jan 1, 2017 Other employee benefits liability - current (note 14) $ 2,564 $ 2,756 $ 2,356 Other employee benefits liability - non-current 93,628 108,397 89,273 Net liability $ 96,192 $ 111,153 $ 91,629 Other employee future benefit expense includes the following Dec. 31, 2018 Dec. 31, 2017 Current service cost 1 $ 3,710 $ 2,614 Net interest cost 3,683 3,567 Components recognized in consolidated income statements $ 7,393 $ 6,181 1 Includes remeasurement of other long term employee benefit Dec. 31, 2018 Dec. 31, 2017 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ (9,996 ) $ 1,172 Actuarial (gains)/losses arising from changes in financial assumptions 2,809 6,761 Actuarial gains arising from changes experience adjustments (3,472 ) (120 ) Components recognized in statements of comprehensive income $ (10,659 ) $ 7,813 Total other employee future benefit cost $ (3,266 ) 13,994 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. Dec. 31, 2018 Dec. 31, 2017 Defined benefit cost: 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) 1 Males 21.0 21.6 Females 23.7 24.1 Dec. 31, 2018 Dec. 31, 2017 Defined benefit obligation: Discount rate 3.88% 3.64% Initial weighted average health care trend rate 5.74% 5.97% Ultimate weighted average health care trend rate 4.00% 4.00% Average longevity at retirement age for current pensioners (years) 1 Males 21.1 21.0 Females 23.9 23.7 Average longevity at retirement age for current employees (future pensioners) (years) 1 Males 23.0 22.9 Females 25.6 25.5 1 CPM2014 Priv with CPM-B projection scale 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 inflation risk The majority of the plan's benefit obligations are linked to health care cost inflation and higher inflation will lead to higher liabilities. Longevity risk 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 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 $7,754 (increase by $8,886). – If the health care cost assumption increases (decreases) by 1%, the defined benefit obligation would increase by $18,013 (decrease by $14,029). – If the life expectancy increases (decreases) by one year for both men and women, the defined benefit obligations would increase by $3,417, (decrease by $3,392). The average duration of the non-pension post employment obligation at December 31, 2018 is 18.6 years (2017: 18.9 years). This number can be broken down as follows: – Active members: 23.7 years (2017: 22.8 years) – Inactive members: 13.4 years (2017: 13.1 years)

Income and mining taxes

Income and mining taxes	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Income and mining taxes [Text Block]	22. Income and mining taxes (a) Tax expense: The tax expense (recoveries) is applicable as follows: Year ended December 31, 2018 2017 (Restated) Current: Income tax expense Canada $ 5,251 Peru 19,103 24,523 Mining tax expense Canada 9,085 5,085 Peru 11,030 14,706 Adjustments in respect of prior years 707 (448 ) 45,176 49,943 Deferred: Income tax - origination, revaluation and/or and reversal of temporary difference Canada 25,811 2,067 Peru 10,780 29,727 United States 3,170 (46,908 ) Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference Canada 414 467 Peru (621 ) (661 ) Adjustments in respect of prior years 691 (1,416 ) 40,245 (16,724 ) $ 85,421 $ 33,219 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, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Deferred income tax asset Canada $ 15,513 $ 31,937 $ 40,162 Deferred income tax liability Peru (196,452 ) (183,973 ) (203,081 ) United States (110,861 ) (107,692 ) (107,691 ) Deferred mining tax liability Canada (5,119 ) (5,614 ) (4,706 ) Peru (11,658 ) (12,124 ) (12,785 ) (324,090 ) (309,403 ) (328,263 ) Net deferred tax liability balance, end of year $ (308,577 ) $ (277,466 ) $ (288,101 ) As of January 1, 2017 the deferred tax assets and deferred tax liabilities attributable to Canada are 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 December 31, December 31, 2018 2017 (Restated) Net deferred tax liability balance, beginning of year $ (277,466 ) $ (288,101 ) Deferred tax (expense) recovery (40,245 ) 16,724 OCI transactions 520 (3,845 ) Items charged directly to equity — 2,238 Foreign currency translation on the deferred tax liability 8,614 (4,482 ) Net deferred tax liability balance, end of year $ (308,577 ) $ (277,466 ) (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, 2018 and 2017 is as follows: Year ended December 31, 2018 2017 (Restated) Statutory tax rate 27.00% 27.00% Tax expense at statutory rate $ 46,126 $ 46,685 Effect of: Deductions related to mining taxes (5,976 ) (6,075 ) Adjusted income taxes 40,150 40,610 Mining tax expense 19,214 19,367 59,364 59,977 Permanent differences related to: Capital items (2,903 ) 1,462 Other income tax permanent differences (454 ) 338 Impact of remeasurement on decommissioning liability 3,898 15,290 Temporary income tax differences not recognized 4,449 15,376 Impact related to differences in tax rates in foreign operations 9,594 4,605 Impact of changes to statutory tax rates 45 (52,855 ) Foreign exchange on non-monetary items 11,408 (9,387 ) Impact related to tax assessments and tax return amendments 20 (1,587 ) Tax expense $ 85,421 33,219 The impact of changes to statutory tax rates in 2017 reflects the Tax Cuts and Jobs Act enacted in the U.S that reduced the corporate statutory tax rate. (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, 2018 and 2017 are as follows: Balance sheet Income Statement Year ended Dec. 31, Dec. 31, Jan. 1, Dec. 31, Dec. 31, 2018 2017 2017 2018 2017 (Restated) (Restated) (Restated) Deferred income tax (liability) asset/ expense (recovery) Property, plant and equipment $ (83,407 ) $ (102,053 ) $ (71,837 ) $ (18,646 ) $ 30,216 Pension obligation 7,817 10,034 13,092 2,739 (787 ) Other employee benefits 13,488 16,742 17,778 3,254 1,036 Non-capital losses 72,470 91,495 59,034 19,025 (32,461 ) Share issue and debt costs 10,896 15,707 16,319 4,807 2,850 Other (5,751 ) 12 5,776 7,681 1,657 Deferred income tax asset / expense (recovery) 15,513 31,937 40,162 18,860 2,511 Deferred income tax liability (asset)/ (recovery) expense Property, plant and equipment 339,037 320,036 389,502 25,456 (69,466 ) Pension obligation — — (12,150 ) — 12,150 Other employee benefits 240 192 (14,806 ) 48 14,998 Asset retirement obligations (918 ) (789 ) (11,357 ) (129 ) 10,568 Non-capital losses (27,374 ) (27,539 ) (46,500 ) 165 18,961 Other (3,672 ) (235 ) 6,083 (3,439 ) (6,318 ) Deferred income tax liability/ (recovery) expense 307,313 291,665 310,772 22,101 (19,107 ) Deferred income tax liability/ (recovery) expense $ (291,800 ) $ (259,728 ) $ (270,610 ) $ 40,961 $ (16,596 ) 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, 2018 Dec. 31, 2017 Property, plant and equipment $ — $ 32,089 Capital losses 200,455 223,916 Other employee benefits 77,166 78,871 Asset retirement obligations 175,091 174,448 Non-capital losses 116,542 104,171 Temporary differences not recognized $ 569,254 $ 613,495 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 2018 and expire between 2026 and 2038. The Group incurred United States net operating losses between 2004 and 2018 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2014 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, 2018 and December 31, 2017 are as follows: Dec. 31, 2017 Jan. 1, 2017 Dec. 31, 2018 (Restated) (Restated) Canada Property, plant and equipment $ (5,119 ) $ (5,614 ) $ (4,706 ) Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Peru (Restated) (Restated) Property, plant and equipment $ (11,658 ) $ (12,124 ) $ (12,785 ) For the year ended December 31, 2018, the Group had unrecognized deferred mining tax assets of approximately $8,469 (December 31, 2017 - $8,740). (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, 2018
Statements [Line Items]
Share capital [text block]	23. 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, 2018 Dec. 31, 2017 Common Common shares Amount shares Amount Balance, beginning of year 261,271,188 $ 1,777,409 237,271,188 $ 1,588,319 Equity issuance — — 24,000,000 195,295 Share issue costs, net of tax — (80 ) — (6,205 ) Warrants exercised 963 11 — — Balance, end of period 261,272,151 $ 1,777,340 261,271,188 $ 1,777,409 During the year ended December 31, 2018, the Company declared two semi-annual dividends of C$0.01 per share each. The Company paid $2,026 and $2,019 on March 29, 2018 and September 28, 2018 to shareholders of record as of March 9, 2018 and September 7, 2018, respectively. 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 December, 31, 2017, the Company paid dividends of $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. The Company declared a semi-annual dividend of C$0.01 per share on February 19, 2019. The dividend will be paid on March 29, 2019 to shareholders of record as of March 8, 2019 and is expected to total C$2,613.

Share-based payment

Share-based payment	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Share-based payment [text block]	24. Share-based payment (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, 2018, the carrying amount and the intrinsic value of the outstanding liability related to the DSU plan was $4,288 (December 31, 2017 - $6,623) (note 19). The following table outlines information related to DSUs granted, expenses recognized and payments made during the year. Year ended Dec. 31, 2018 Dec. 31, 2017 Granted during the year: Number of units 158,886 130,964 Weighted average price (C$/unit) $ 7.91 $ 8.59 Expenses recognized during the year 1 $ (1,877 ) $ 2,982 Payments made during the year (note 19) $ — $ 638 1 This expense relates to the grant of DSUs, as well as mark-to-market adjustments, and is presented within selling and administrative expenses on the consolidated income statements. 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, 2018, the carrying amount of the outstanding liability related to the RSU plan was $12,201 (December 31, 2017 - $19,409) (note 19). The following table outlines information related to RSUs granted, expenses recognized and payments made in the year. Year ended Dec. 31, 2018 Dec. 31, 2017 Number of units, beginning of year 3,405,713 3,492,408 Number of units granted during the year 1,031,701 987,194 Credits for dividends 9,724 8,156 Number of units forfeited during the year (21,190 ) (201,946 ) Number of units vested (759,081 ) (880,099 ) Number of units, end of year 1 3,666,867 3,405,713 Weighted average price - granted (C$/unit) $ 10.33 $ 10.60 (Gain) expenses recognized during the year 2 $ (496 ) 12,937 Payments made during the year (note 19) $ 6,435 5,491 1 Includes 1,842,837 and 587,633 units that have vested; however, are unreleased and unpaid as of December 31, 2018 and December 31, 2017, respectively. (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. As of December 31, 2018, all options had either been exercised, or expired. The Board’s current policy is to not make share option grants to executives and directors. No options were granted under the Plan during the years ended December 31, 2018 and December 31, 2017, 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, 2018 Dec. 31, 2017 Weighted- Weighted Number of average Number of average shares subject exercise price shares subject exercise price to option C$ to option C$ Balance, beginning of year 523,352 $ 15.86 1,470,377 $ 19.24 Forfeited — $ — (20,002 ) $ 15.86 Expired (523,352 ) $ 15.86 (927,023 ) $ 21.22 Balance, end of year — $ — 523,352 $ 15.86 There were no options outstanding as at December 31, 2018. The following table summarizes the options outstanding in 2017: Dec. 31, 2017 Weighted- average Weighted- Range of Number of remaining average Number of Weighted exercise prices options contractual live exercise price options average C$ outstanding (years) C$ exercisable exercise price $ 15.86 523,352 0.2 $ 15.86 523,352 15.86

Earnings per share

Earnings per share	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Earnings per share [Text Block]	25. Earnings per share Year ended December 31, 2018 2017 Basic and diluted weighted average common shares outstanding 261,271,621 243,500,696

Capital management

Capital management	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Capital management [Text Block]	26. 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, 2018 was $981,030 (December 31, 2017 – $979,575). 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 $515,497 as at December 31, 2018 (2017 - $356,499), 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 17). 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, 2018
Statements [Line Items]
Financial instruments [Text Block]	27. 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, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Recurring measurements FV CV FV CV FV CV Financial assets at amortized cost Cash and cash equivalents 1 $ 515,497 $ 515,497 $ 356,499 $ 356,499 $ 146,864 $ 146,864 Restricted cash 1 3,738 3,738 206 206 17,148 17,148 Fair value through profit or loss Trade and other receivables 1,2 126,311 126,311 159,626 159,626 128,983 128,983 Non-hedge derivative assets 3 6,628 6,628 2,841 2,841 3,397 3,397 Prepayment option - embedded derivatives 7 3,664 3,664 3,980 3,980 4,430 4,430 Investments at FVTPL 4 15,159 15,159 22,255 22,255 13,700 13,700 Total financial assets 670,997 670,997 545,407 545,407 314,522 314,522 Financial liabilities at amortized cost Trade and other payables 1,2 164,628 164,628 192,448 192,448 163,027 163,027 Finance leases 74,235 74,235 84,573 84,573 12,932 12,932 Other financial liabilities 5 17,425 21,361 19,625 22,568 17,231 22,998 Senior unsecured notes 6 988,294 992,970 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 (8,276 ) (8,276 ) (8,328 ) (8,328 ) (6,752 ) (6,752 ) Fair value through profit or loss Embedded derivatives 3 7,201 7,201 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 3 2,634 2,634 16,140 16,140 10,682 10,682 Total financial liabilities 1,246,141 1,254,753 1,396,424 1,308,510 1,497,884 1,454,477 Net financial liability $ (575,144 ) $ (583,756 ) $ (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 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 All 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. 5 These financial liabilities relate to agreements with communities near the Constancia project in Peru (note 15). 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 17) has been determined using the quoted market price at the year end. 7 Fair value of the prepayment option embedded derivative related to the long-term debt (note 17) 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, 2018 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 6,628 $ — $ 6,628 Investments at FVTPL 15,159 — — 15,159 Prepayment option embedded derivative — 3,664 — 3,664 $ 15,159 $ 10,292 $ — $ 25,451 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ — $ 7,201 $ — $ 7,201 Non-hedge derivatives — 2,634 — 2,634 $ — $ 9,835 $ — $ 9,835 December 31, 2017 (Restated) Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 2,841 $ — $ 2,841 Investments at FVTPL 21,973 282 — 22,255 Prepayment option embedded derivative — 3,980 — 3,980 $ 21,973 $ 7,103 $ — $ 29,076 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 January 1, 2017 (Restated) Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 3,397 $ — $ 3,397 Investments at FVTPL 12,018 192 1,490 13,700 Prepayment option embedded derivative — 4,430 — 4,430 $ 12,018 $ 8,019 $ 1,490 $ 21,527 Financial liabilities measured at fair value Financial assets at FVTPL: Embedded derivatives $ — $ 86 $ — $ 86 Non-hedge derivatives — 10,682 — 10,682 Option liability — 570 — 570 Warrant liability 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 year 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, 2018, 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, 2018, the Group had 29,950 tonnes of net copper swaps outstanding at an effective average price of $2.77/lb and settling across January to April 2019. At December 31, 2017, the Group had 34,500 tonnes of net copper swaps outstanding at an average fixed receivable price of $3.10/lb, which settled across January 2018 to April 2018. The aggregate fair value of the transactions at December 31, 2018 was an asset position of $4,171 (December 31, 2017 and January 1, 2017 a liability position of $13,786 and $8,657, respectively). 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, 2018 and December 31, 2017, 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, 2018, the Group held contracts for forward zinc purchased of 2,925 tonnes (December 31, 2017 – 2,808 tonnes) that related to forward customer sales of zinc. Prices range from $2,400 to $3,203 per tonne (December 31, 2017 – $2,534 to $3,292) and settlement dates extend to November 2019. The aggregate fair value of the transactions at December 31, 2018 was a net liability position of $177 (December 31, 2017 and January 1, 2017 – a net asset position of $487 and $1,372 respectively). (c) Embedded derivatives Changes in fair value of provisionally priced receivables The Group records changes in fair value of provisionally priced receivables 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. Changes in fair value of provisionally priced receivables 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 changes in fair value of provisionally priced receivables are classified in operating activities. As at December 31, 2018, the Group’s net position consisted of contracts awaiting final pricing for sales of 30,519 tonnes of copper (December 31, 2017 – 38,027 tonnes). As of December 31, 2018, there are also 199 tonnes of zinc (December 31, 2017 – 6,412 tonnes) awaiting final pricing. In addition, at December 31, 2018, the Group’s net position consisted of contracts awaiting final pricing for sales of 15,528 ounces of gold and 96,646 ounces of silver (December 31, 2017 – 24,553 ounces of gold and 172,886 ounces of silver). As at December 31, 2018, the Group’s provisionally priced copper, zinc, gold and silver sales subject to final settlement were recorded at average prices of $2.69/lb (December 31, 2017 – $3.29/lb), $1.13/lb (December 31, 2017 – $1.51/lb), $1,279/oz (December 31, 2017 – $1,309/oz) and $15.45/oz (December 31, 2017 – $17.10/oz), respectively. The aggregate changes in fair value of provisionally priced receivables within the copper and zinc concentrate sales contracts at December 31, 2018, was a liability position of $6,351 (December 31, 2017 and January 1, 2017 – an asset position of $17,427 and $12,538 respectively). The aggregate fair value of other embedded derivatives at December 31, 2018, was nil (December 31, 2017 and January 1, 2017 – a liability position of $1,533 and $86, respectively). Prepayment option embedded derivative The senior unsecured notes (note 17) 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 6f). The fair value of the embedded derivative at December 31, 2018 was an asset of $3,664 (December 31, 2017 and January 1, 2017 - an asset of $3,980 and $4,430, respectively). Pampacancha delivery obligation-embedded derivative The Group has recognized an obligation to deliver additional precious metal credits to Wheaton as a result of the Pampacancha deposit not being mined in 2018. The fair value of the embedded derivative at December 31, 2018 was a liability of $7,201 (December 31, 2017 – nil). (d) Warrants and option liabilities A total of 22,391,490 warrants were issued as a result of the acquisition of Augusta Resource Corporation which entitled the holders 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. As at December 31, 2018, all warrants had either been exercised or expired. (e) 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, share 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, 2018 Dec. 31, 2017 CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalent $ 11,498 $ 29,740 $ 13,934 $ 9,518 $ 20,597 $ 3,692 Trade and other receivables 711 42,056 1,272 530 77,824 1,114 Other financial assets 15,159 — — 22,255 — — Trade and other payables (5,341 ) (3,133 ) (19,513 ) (6,115 ) (9,687 ) (17,917 ) Other financial liabilities — — (21,361 ) (6,961 ) — (22,568 ) $ 22,027 $ 68,663 $ (25,668 ) $ 19,227 $ 88,734 $ (35,679 ) 1 HMI is exposed to foreign currency risk on CAD. 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, 2018 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, 2018 Change of: 2018 after-tax profit by: 2018 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 5.0 million $ — million USD/CAD exchange rate 1 - 10% (6.0 ) million — million USD/PEN exchange rate 2 + 10% 1.5 million — million USD/PEN exchange rate 2 - 10% (1.8 ) million — million Would have changed Would have changed December 31, 2017 (Restated) Change of: 2017 after-tax profit by: 2017 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 3.6 million $ — million USD/CAD exchange rate 1 - 10% (4.4 ) million — million USD/PEN exchange rate 2 + 10% 2.1 million — million USD/PEN exchange rate 2 - 10% (2.6 ) million — million 1 Effect on profit due to foreign currency remeasurements of balances denominated in a currency different from a Hudbay subsidiary's functional currency. 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, 2018 and does not reflect the overall effect that changes in market variables would have on the Groups’ results of operations. Would have changed 2018 after-tax profit December 31, 2018 Change of: by: Copper prices ($/lb) 3 + $ 0.30 $ (3.1 ) million Copper prices ($/lb) 3 — $ 0.30 3.1 million Zinc prices ($/lb) 4 + $ 0.10 0.5 million Zinc prices ($/lb) 4 — $ 0.10 (0.5 ) million Would have changed December 31, 2017 Change of: 2017 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (2.3 ) million Copper prices ($/lb) 3 — $ 0.30 2.3 million Zinc prices ($/lb) 4 + $ 0.10 0.9 million Zinc prices ($/lb) 4 — $ 0.10 (0.9 ) million 3 Effect on profit due to embedded provisional pricing derivatives (note 27c) and copper fixed for floating swaps (note 27b). 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 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, 2018 and does not reflect the overall effect that changes in market variables would have on the Group’s finance expenses. Would have changed 2018 Would have changed December 31, 2018 Change of: after-tax profit by: 2018 after-tax OCI by: Share prices + 25% $ 3.8 million $ — million Share prices - 25% (3.8 ) million — million December 31, 2017 Would have changed 2017 Would have changed (Restated) Change of: after-tax profit by: 2017 after-tax OCI by: Share prices + 25% $ 5.0 million $ — million Share prices - 25% (5.0 ) million — million Interest rate risk The group is exposed to the following interest rate risks: – 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. The most material of these risks is the embedded derivative associated with its Notes. This analysis is based on values at December 31, 2018 and does not reflect the overall effect that changes in market variables would have on the group’s finance expenses. Change Would have changed Would have changed December 31, 2018 of: 2018 after-tax profit by: 2018 after-tax OCI by: Interest rates + 2.00% $ (3.3 ) million $ — million Interest rates - 2.00% 3.2 million — million December 31, 2017 Change Would have changed Would have changed of: 2017 after-tax profit by: 2017 after-tax OCI by: Interest rates + 2.00% $ 0.4 million $ — million Interest rates - (2.8 ) million — million Refer to note 7 for information on 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 27a. 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 74% of total cash and cash equivalents as at December 31, 2018 (2017 – 97%). 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, 2018, approximately 95% of the Group’s trade receivables were insured or payable by letters of credit (2017 - 75% 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. Four customers accounted for approximately 78% of total trade receivables as at December 31, 2018 (2017 – five customers accounted for approximately 77%). Credit risk for these customers is assessed as medium to low risk. As at December 31, 2018, none of the Group’s trade receivables was aged more than 30 days (2017 – 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 and financial assets used to manage liquidity risk. 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 13 - 36 37 - 60 More than amount cash flows or less months months 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 515,497 $ 515,497 $ 515,497 — — — Trade and other receivables 126,311 136,913 112,258 11,440 13,215 Non-hedge derivative assets 6,628 6,628 6,628 — — — $ 648,436 $ 659,038 $ 634,383 $ 11,440 $ 13,215 $ — Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (164,628 ) (164,628 ) (164,628 ) — — — Other financial liabilities (21,361 ) (31,854 ) (3,719 ) (4,757 ) (3,068 ) (20,310 ) Long-term debt, including embedded derivatives (981,030 ) (1,439,821 ) (79,263 ) (156,933 ) (535,000 ) (668,625 ) Finance lease liabilities (74,235 ) (78,174 ) (18,448 ) (40,615 ) (19,111 ) — $ (1,241,254 ) $ (1,714,477 ) $ (266,058 ) $ (202,305 ) $ (557,179 ) $ (688,935 ) Derivative financial liabilities Non hedge derivative contracts (2,634 ) (2,634 ) (2,634 ) — — — (2,634 ) (2,634 ) (2,634 ) — — — Carrying Contractual 12 months or 13 - 36 37 - 60 More than 60 Dec. 31, 2017 amount cash flows less months months months Assets used to manage liquidity risk Cash and cash equivalents $ 356,499 $ 356,499 $ 356,499 $ — $ — $ — Trade and other receivables 159,626 147,196 124,134 12,403 10,659 — Non-hedge derivative assets 2,841 2,841 2,841 — — — $ 518,966 $ 506,536 $ 483,474 $ 12,403 $ 10,659 $ — Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (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 embedded derivatives (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 ) $ — $ —

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Commitments and contingencies [Text Block]	28. 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: 2018 2017 Within one year $ 42,019 $ 5,682 After one year but not more than five years 19,374 12,291 More than five years 2,055 1,781 $ 63,448 $ 19,754 The cost of operating leases recognized as an expense amounted to $17,269 for the year ended December 31, 2018 (year ended December 31, 2017 - $4,972). (b) Capital commitments As at December 31, 2018, the Group had outstanding capital commitments in Canada of approximately $2,972 primarily related to committed long-lead orders for the paste plant and Stall concentrator, all of which can be terminated by the Group, approximately $38,784 in Peru primarily related to sustaining capital costs, all of which can be terminated by the Group, and approximately $166,823 in Arizona, primarily related to its Rosemont project, of which approximately $83,180 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 judgment 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. Contingent assets There were no significant contingent assets to disclose at December 31, 2018 or December 31, 2017.

Related parties

Related parties	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Related parties [Text Block]	29. 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 2018 2017 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/de velopment 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% HudBay Arizona (US) Exploration/de Holding Rosemont Copper Company 1 Arizona velopment Corporation 100% 100% 1 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. 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: 2018 2017 Short-term employee benefits 1 $ 8,652 $ 8,654 Post-employment benefits 762 777 Long-term share-based awards 5,970 6,110 $ 15,384 $ 15,541 1

Supplementary cash flow informa

Supplementary cash flow information	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Supplementary cash flow information [text block]	30. Supplementary cash flow information (a) Change in non-cash working capital: Year ended December 31, 2018 2017 Change in: Trade and other receivables $ 16,198 $ (8,979 ) Other financial assets/liabilities (17,290 ) 6,620 Inventories (32 ) (18,690 ) Prepaid expenses (38 ) (4,619 ) Trade and other payables (19,608 ) (6,336 ) Change in taxes payable/receivable, net 7,881 39,326 Provisions and other liabilities (1,030 ) 1,693 $ (13,919 ) $ 9,015 (b) Non cash transactions: During the year ended December 31, 2018, 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 twelve months ended December 31, 2018 led to a net increase in related property, plant and equipment assets of $8,998 (year ended December 31, 2017 - $10,661) mainly as a result of increased mine activity and the resulting higher disturbance. - Property, plant and equipment included $10,588 of net additions related to capital additions under finance lease (year ended December 31, 2017- $3,234). - 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 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, 2018
Statements [Line Items]
Segmented information [Text Block]	31. 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 and molybdenum 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, and since December 2018, the newly acquired Mason Resources in the State of Nevada. 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, 2018 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 667,322 $ 805,044 $ — $ — $ 1,472,366 Cost of sales Mine operating costs 412,760 353,199 — — 765,959 Depreciation and amortization 121,515 211,152 — — 332,667 Gross profit 133,047 240,693 — — 373,740 Selling and administrative expenses — — — 27,243 27,243 Exploration and evaluation 12,302 5,640 — 10,628 28,570 Other operating expense (income) 5,433 11,739 539 1,360 19,071 Results from operating activities $ 115,312 $ 223,314 $ (539 )$ (39,231 ) $ 298,856 Finance income (8,450 ) Finance expenses 152,000 Other finance gain (15,531 ) Profit before tax 170,837 Tax expense 85,421 Profit for the year $ 85,416 Year ended December 31, 2017 (Restated) Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 712,244 $ 690,095 $ — $ — $ 1,402,339 Cost of sales Mine operating costs 392,863 302,865 — — 695,728 Depreciation and amortization 118,770 178,700 — — 297,470 Gross profit 200,611 208,530 — — 409,141 Selling and administrative expenses — — — 42,283 42,283 Exploration and evaluation 5,649 1,442 — 8,383 15,474 Other operating (income) expense (56 ) (6,612 ) 517 (6,289 ) (12,440 ) Asset impairment 11,320 — — — 11,320 Results from operating activities $ 183,698 $ 213,700 $ (517 ) $ (44,377 ) $ 352,504 Finance income (2,849 ) Finance expenses 169,442 Other finance losses 13,000 Profit before tax 172,911 Tax expense 33,219 Profit for the year $ 139,692 December 31, 2018 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 621,253 $ 2,751,525 $ 896,693 $ 416,164 $ 4,685,635 Total liabilities 424,576 921,773 115,470 1,044,960 2,506,779 Property, plant and equipment 1 572,947 2,353,229 868,921 24,715 3,819,812 1 Included in Corporate and Other activities is $21.6 million of property, plant and equipment that is located in Nevada. December 31, 2018 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 123,896 $ 55,818 $ 19,846 $ 22 $ 199,582 December 31, 2017 (Restated) Corporate and other Manitoba Peru Arizona activities Total Total assets $ 738,967 $ 2,750,114 $ 856,589 $ 382,346 $ 4,728,016 Total liabilities 510,506 932,423 110,945 1,061,797 2,615,671 Property, plant and equipment 619,476 2,503,900 836,759 4,098 3,964,233 January 1, 2017 (Restated) Corporate and other Manitoba Peru Arizona activities Total Total assets 730,240 2,808,370 822,498 144,056 4,505,164 Total liabilities 475,644 980,479 158,236 1,130,726 2,745,085 Property, plant and equipment 606,348 2,540,846 800,542 6,016 3,953,752 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 Geographical Segments The following tables represent revenue information regarding the Group’s geographical segments for the years ended December 31: 2018 2017 (Restated) Revenue by customer location 1 Canada $ 553,411 $ 461,033 United States 211,681 159,085 Switzerland 253,165 236,467 Germany 52,530 144,684 China 140,440 145,935 Peru 65,721 101,033 Philippines 84,687 120,199 United Kingdom 68,346 — Other 42,385 33,903 $ 1,472,366 $ 1,402,339 1 Presented based on the ultimate destination of the product if known. If the eventual destination of the product sold through traders is not known then revenue is allocated to the location of the customer's business office and not the ultimate destination of the product. During the year ended December 31, 2018, six customers accounted for approximately 26%, 9%, 8%, 7%, 5% 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, 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.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Statements [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 issuance 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 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. Revenue from the sale of by-products is included within revenue. Sales revenue is recognized when control of the goods sold has been transferred to the buyer. Control is deemed to have passed to the customer when significant risk and reward of the product has passed to the buyer, Hudbay has a present right to payment and physical possession of the product has been transferred to the buyer. Sale of concentrate and finished zinc frequently occur under the following terms, and management has assessed these terms in order to determine timing of transfer of control. Incoterms used by Hudbay Revenue recognized when goods: Cost, Insurance and Freight (CIF) Are loaded on board the vessel Free on Board (FOB) Are loaded on board the vessel Delivered at place (DAP) Arrive at the named place of destination Delivered at terminal (DAT) Arrive at the named place of destination Free Carrier (FCA) Arrive at the named place of delivery 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 achieved, using weight and assay results and forward market prices to estimate the fair value of the total consideration receivable. Therefore, revenue is initially recorded based on an initial provisional invoice. Subsequently, at each reporting date, until the provisionally priced sale is finalized, sales receivables are marked to market, with adjustments (both gains and losses) recorded within revenue separately as “Pricing and volume adjustments” in the notes to the consolidated financial statements and in trade and other receivables on the consolidated balance sheets. As per IFRS 15 Revenue, variability in price is deemed to be fair value movements on provisionally priced receivables under the scope of IFRS 9 Financial Instruments; variability in quantities is deemed to be variable consideration. The variable consideration from weights and assay changes to quantities has been assessed to be insignificant to warrant precluding revenue being recorded as a result of possible future sales reversals. An annual analysis of the accuracy of our weights and assays is completed, and if the accuracy rate falls below a certain threshold, management may record a provision due to a high risk of a significant revenue reversal. The Group only includes in the transaction price an amount which is not highly likely to be subject to significant subsequent revenue reversal. Within sales contracts with customers, separate performance obligations may arise pertaining to the shipping of goods sold. Where significant, costs and the transaction price are allocated on a relative stand alone selling basis to any separate performance obligations and are recognized over the period of time the goods sold are shipped, on a gross basis. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. There is a significant financing component associated with the Group's precious metal streaming arrangements since funds were received in advance of the delivery of concentrate. When a significant financing component is recognized, finance expense will be higher and revenues will be higher as the larger deferred revenue balance is amortized to revenues. A market-based discount rate is utilized at the inception of each of the respective stream agreements to determine a discount rate for computing the interest charges for the significant financing component of the deferred revenue balance. As product is delivered, the deferred revenue amount including accreted interest will be drawn down. The draw down rate requires the use of proven and probable reserves and certain resources in the calculation that are beyond proven and probable reserves which management is reasonably confident are transferable to reserves. Key estimates used in determining the significant financing component include the discount rate and the reserve and resources assumed for conversion.
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 greenfield exploration and evaluation assets. The Group allocates near mine exploration and evaluation assets to CGUs based on their operating segment, geographic location and management’s intended use for the property. Near mine exploration and evaluation assets are allocated to CGUs separate from those containing producing or development-phase assets, except where such 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 pro-rated 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: Non-derivative financial instruments are initially recognized at fair value plus, in the case of a financial asset or financial liability not measured 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. The classification of financial assets is based on the results of the contractual characteristics test and the business model assessment which will result in the financial asset being classified as either: amortized cost, fair value through profit or loss (“FVTPL”) or fair value through other comprehensive income (“FVTOCI”). (i) Non-derivative financial instruments – classification: Financial assets at fair value through profit or loss Provisionally priced copper sales receivables, warrants, investments in securities of junior mining companies and the Group’s joint venture receivables are classified as financial assets at fair value through profit or loss and are measured at fair value. The unrealized gains or losses related to changes in fair value are reported in other finance income/expense in the consolidated income statements. Amortized cost Cash and cash equivalents and restricted cash are classified as and measured at amortized cost and are carried at amortized cost using the effective interest rate method, less impairment losses, if any. Non-derivative financial liabilities Accounts payable and senior unsecured notes are initially recognised at FVTPL and subsequently accounted for at amortized cost, using the effective interest rate method. The amortization of senior unsecured notes issue costs is calculated using the effective interest rate method. (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) 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). (v) Impairment of financial instruments: The Group recognizes loss allowances for Expected Credit Losses (“ECL”) for trade receivables not measured at FVTPL. Loss allowances for trade receivables are measured at an amount equal to lifetime ECL. ECL is a probability-weighted estimate and measured as at the present value of all cash shortfalls including the impact of forward looking information. The Company has established a provision based on the Company’s historical credit loss experience, adjusted for forward-looking factors specific to the debtors and the economic environment. The loss allowance is presented as a deduction to trade receivables in the balance sheets. (vi) 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 or when its terms are modified and the cash flows of the modified liability are substantially different.
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.
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 had options outstanding under a stock option plan. These plans are included in provisions on the consolidated balance sheets and further described in note 24. 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. As RSUs are typically granted in the first quarter of each year, their vesting period is typically slightly less than three years. 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 previously consisted 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 31.
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 polici_2

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [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

New standards (Tables)

New standards (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of new standards adopted, impact summary consolidated balance sheet [Table Text Block]	January 1, 2017 As reported IFRS 9 IFRS 15 Restated Property, plant and equipment $ 3,865,823 - $ 87,929 $ 3,953,752 Deferred tax assets 1 45,103 - (4,941 ) 40,162 Deferred revenue (current) 65,619 - 21,792 87,411 Deferred revenue (non-current) 472,233 - 56,602 528,835 Deferred tax liabilities 1 320,536 - 7,727 328,263 Reserves (42,040 ) (5,025 ) (6,568 ) (53,633 ) Retained Earnings 216,933 5,025 3,435 225,393 1 December 31, 2017 As reported IFRS 9 IFRS 15 Restated Property, plant and equipment $ 3,880,894 - $ 83,339 $ 3,964,233 Deferred tax assets 35,989 - (4,052 ) 31,937 Deferred revenue (current) 49,907 - 57,287 107,194 Deferred revenue (non-current) 448,137 - 46,599 494,736 Deferred tax liabilities 302,092 - 7,311 309,403 Reserves (10,300 ) (10,424 ) (5,739 ) (26,463 ) Retained Earnings 377,146 10,424 (26,171 ) 361,399
Disclosure of new standards adopted, impact summary consolidated income statement [Table Text Block]	Twelve Months Ended December 31, 2017 As reported IFRS 9 IFRS 15 Restated Revenue $ 1,362,553 $ — $ 39,786 $ 1,402,339 Depreciation and amortization 292,880 — 4,590 297,470 Finance expenses 103,028 — 66,414 169,442 Other finance loss 18,401 (5,401 ) — 13,000 Profit before tax 198,728 5,401 (31,218 ) 172,911 Tax expense 34,829 — (1,610 ) 33,219 Profit for the year 163,899 5,401 (29,608 ) 139,692 Other comprehensive income for the year 31,740 (5,401 ) 831 27,170 Earnings (loss) per share - Basic and diluted 0.67 0.02 (0.12 ) 0.57
Disclosure of new standards adopted, impact summary consolidated cash flow [Table Text Block]	Twelve Months Ended December 31, 2017 As reported IFRS 9 IFRS 15 Restated Profit for the period $ 163,899 $ 5,401 $ (29,608 ) $ 139,692 Tax expense 34,829 - (1,610 ) 33,219 Depreciation and amortization 293,235 - 4,590 297,825 Net finance expense 100,179 - 66,414 166,593 Change in deferred revenue related to stream (48,958 ) - (39,786 ) (88,744 ) Gain on investments at FVTPL - (3,511 ) - (3,511 ) Loss on available-for-sale investments 1,970 (1,970 ) - - Other and foreign exchange 4,230 80 - 4,310

Acquisition of Mason (Tables)

Acquisition of Mason (Tables)	12 Months Ended
	Dec. 31, 2018
Notes to Financial Statements [Abstract]
Disclosure of detailed information about acquisition date fair value of the major classes of consideration	USD CAD equivalent Cash $ 20,126 $ 27,070 Transaction costs 671 902 Total cash consideration 20,797 27,972 Fair value of shares previously owned by the Group (10,854,170 shares) 3,228 4,342 Total consideration $ 24,025 $ 32,314
Disclosure of detailed information about acquisition date of fair values of the major classes of asset and liabilities	Fair value Cash $ 1,747 Other assets 624 Mineral properties 21,654 Total assets acquired $ 24,025

Revenue and expenses (Tables)

Revenue and expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about revenue [Table Text Block]	Year ended December 31, 2018 2017 (Restated) Copper $ 963,063 $ 927,029 Zinc 357,396 347,680 Gold 149,043 137,326 Silver 85,808 76,850 Molybdenum 20,995 9,381 Other 4,726 4,992 1,581,031 1,503,258 Pricing and volume adjustments 1 (6,756 ) 5,147 1,574,275 1,508,405 Treatment and refining charges (101,909 ) (106,066 ) $ 1,472,366 $ 1,402,339
Disclosure of depreciation and amortization expense [Table Text Block]	Year ended December 31, 2018 2017 (Restated) Cost of sales $ 332,667 Selling and administrative expenses 477 355 $ 333,144
Disclosure of detailed information about share-based payment expenses (recoveries) [Table Text Block]	Cash-settled RSUs DSUs Total share-based (note 24a) (note 24a) payment expense Year ended December 31, 2018 Cost of sales $ 160 $ — $ 160 Selling and administrative (702 ) (1,877 ) (2,579 ) Other operating 46 — 46 $ (496 ) $ (1,877 ) $ (2,373 ) Year ended December 31, 2017 Cost of sales $ 1,946 $ — $ 1,946 Selling and administrative 9,667 2,982 12,649 Other operating 1,324 — 1,324 $ 12,937 $ 2,982 $ 15,919
Disclosure of detailed information about employee benefits expense [Table Text Block]	Year ended December 31, 2018 2017 Current employee benefits $ 176,571 $ 147,760 Profit-sharing plan expense 9,228 19,757 Share-based payments (notes 6c, 19, 24) Cash-settled restricted share units (496 ) 12,937 Cash-settled deferred share units (1,877 ) 2,982 Employee share purchase plan 1,533 1,328 Post-employee pension benefits Defined benefit plans 12,295 10,132 Defined contribution plans 1,511 2,443 Past service costs 383 10,442 Other post-retirement employee benefits 9,248 7,250 Termination benefits 1,206 419 $ 209,602 $ 215,450
Disclosure of other operating expense [Table Text Block]	Year ended December 31, 2018 2017 Regional costs $ 4,673 $ 4,308 Pampacancha delivery obligation 7,218 — Pension settlement loss (note 20) 2,163 — Constancia insurance recovery — (12,857 ) Realized gain on contingent consideration of Balmat — (6,400 ) Loss on disposals and other 5,017 2,509 $ 19,071 )
Disclosure of finance cost (income) [Table Text Block]	Year ended December 31, 2018 2017 (Restated) Finance income $ (8,450 ) $ (2,849 ) Finance expenses Interest expense on long-term debt 77,783 87,819 Accretion on financial liabilities at amortized cost 1,244 1,302 Finance costs on deferred revenue (note 18) 64,921 66,414 Unwinding of discounts on provisions (note 19) 4,684 4,159 Withholding taxes 9,424 9,641 Other finance expense 7,116 13,256 165,172 182,591 Interest capitalized (13,172 ) (13,149 ) 152,000 169,442 Other finance (gains) losses Net foreign exchange (gains) losses (11,067 ) 15,772 Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants (6,748 ) (1,051 ) Embedded derivatives (1,514 ) 1,790 Investments 3,798 (3,511 ) (15,531 ) 13,000 Net finance expense and other finance losses $ 128,019
Disclosure of detailed information about impairment loss by segment [Table Text Block]	Manitoba Pre-tax impairment to: Property, plant & equipment (note 12) $ 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, 2018
Statements [Line Items]
Disclosure of detailed information about cash and cash equivalents explanatory [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Cash on hand and demand deposits $ 515,497 $ 356,499 $ 129,850 Short-term money market instruments with maturities of of three months or less at acquisition date — — 17,014 $ 515,497 $ 356,499 $ 146,864

Trade and other receivables (Ta

Trade and other receivables (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about trade and other receivables explanatory [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Trade receivables $ 102,112 $ 97,924 Statutory receivables 12,764 13,961 43,808 Receivable from joint venture partners 245 2,808 — Other receivables 2,032 2,271 10,835 117,153 155,522 152,567 Non-current Taxes receivable 17,199 14,394 12,424 Receivable from joint venture partners 20,404 16,414 18,681 Other receivables 1,518 1,651 1,543 39,121 32,459 32,648 $ 156,274 $ 185,215

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about inventories [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Stockpile $ 5,463 $ 13,468 $ 9,368 Work in progress 1,762 14,552 9,100 Finished goods 62,546 71,906 54,583 Materials and supplies 48,703 41,756 39,413 118,474 141,682 112,464 Non-current Stockpile 14,730 — — Materials and supplies 4,746 5,809 4,537 19,476 5,809 4,537 $ 137,950 $ 147,491 $ 117,001

Other financial assets (Tables)

Other financial assets (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of other financial assets [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Current Derivative assets $ 6,628 $ 2,841 $ 3,397 Restricted cash 3,738 — — $ 10,366 $ 2,841 $ 3,397 Non-current Investments at fair value through profit or loss 15,159 22,255 13,700 Restricted cash — 206 17,148 15,159 22,461 30,848 $ 25,525 $ 25,302 $ 34,245

Intangible assets - computer _2

Intangible assets - computer software (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about intangible assets [text block] [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Cost Balance, beginning of year $ 19,169 $ 16,998 $ 16,179 Additions 590 1,203 407 Effects of movement in exchange rates (1,202 ) 968 412 Balance, end of year 18,557 19,169 16,998 Accumulated amortization Balance, beginning of year 13,594 10,384 7,320 Additions 1,793 2,541 2,882 Effects of movement in exchange rates (992 ) 669 182 Balance, end of year 14,395 13,594 10,384 Net book value $ 4,162 $ 5,575 $ 6,614

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about property, plant and equipment [Table Text Block]	Exploration and evaluation Capital works Mining Plant and Dec. 31, 2018 assets in progress properties equipment Total Balance, beginning of year (Restated) $ 23,010 $ 933,531 $ 1,975,061 $ 2,536,019 $ 5,467,621 Additions 9,950 88,920 — 16,689 115,559 Acquisitions (note 5) 21,654 — — — 21,654 Capitalized stripping and development — — 84,023 — 84,023 Decommissioning and restoration — 15 1,711 7,272 8,998 Interest capitalized — 13,172 — — 13,172 Transfers and other movements — (152,781 ) 2,132 150,649 — Disposals (1,208 ) (4,034 ) — (9,749 ) (14,991 ) Effects of movements in exchange rates (1,197 ) (3,873 ) (65,434 ) (62,757 ) (133,261 ) Other (3 ) (1,169 ) 946 224 (2 ) Balance, end of year 52,206 873,781 1,998,439 2,638,347 5,562,773 Accumulated depreciation Balance, beginning of year (Restated) — — 683,183 820,205 1,503,388 Depreciation for the year — — 141,218 189,354 330,572 Disposals — — — (6,780 ) (6,780 ) Effects of movement in exchange rates — — (43,469 ) (40,211 ) (83,680 ) Other — — (178 ) (361 ) (539 ) Balance, end of year — — 780,754 962,207 1,742,961 Net book value $ 52,206 $ 873,781 $ 1,217,685 $ 1,676,140 $ 3,819,812 Exploration and evaluation Capital works Mining Plant and Dec. 31, 2017 assets in progress properties equipment Total Balance, beginning of year (Restated) $ 15,015 $ 844,759 $ 1,852,705 $ 2,385,995 $ 5,098,474 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 (note 6g) — (11,320 ) — — (11,320 ) Disposals — (13 ) (1,600 ) (9,586 ) (11,199 ) Effects of movements in exchange rates 995 2,955 49,184 47,553 100,687 Other — 6,814 85 455 7,354 Balance, end of year (Restated) 23,010 933,531 1,975,061 2,536,019 5,467,621 Accumulated depreciation Balance, beginning of year (Restated) — — 529,242 615,480 1,144,722 Depreciation for the year (Restated) — — 122,444 183,452 305,896 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 (Restated) — — 683,183 820,205 1,503,388 Net book value (Restated) $ 23,010 $ 933,531 $ 1,291,878 $ 1,715,814 $ 3,964,233

Trade and other payables (Table

Trade and other payables (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about trade and other payables explanatory [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Trade payables $ 61,395 $ 71,336 $ 80,509 Accruals and payables 68,386 86,078 78,154 Accrued interest 34,662 34,848 4,300 Exploration and evaluation payables 185 186 64 Embedded derivatives - provisional pricing (note 27c) — 373 86 Statutory payables 7,324 6,296 6,549 $ 171,952 $ 199,117 $ 169,662

Other liabilities (Tables)

Other liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of other current liabilities [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Provisions (note 19) $ 14,276 $ 27,370 $ 14,367 Pension liability (note 20) 11,854 19,401 24,635 Other employee benefits (note 21) 2,564 2,756 2,356 Unearned revenue 1,857 2,435 849 $ 30,551 $ 51,962 $ 42,207

Other financial liabilities (Ta

Other financial liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about other financial liabilities explanatory [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Current Derivative liabilities $ 2,634 $ 16,140 $ 10,682 Warrants at fair value through profit or loss — 6,961 — Contingent consideration - gold price option — 732 — Other financial liabilities at amortized cost 2,590 2,630 2,813 Embedded derivatives (note 27c) 7,201 297 — 12,425 26,760 13,495 Non-current Contingent consideration - gold price option — — 570 Warrants at fair value through profit or loss — — 7,588 Other financial liabilities at amortized cost 18,771 19,938 20,185 Embedded derivatives (note 27c) — 863 — 18,771 20,801 28,343 $ 31,196 $ 47,561 $ 41,838

Finance lease obligations (Tabl

Finance lease obligations (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of additional information about leasing activities for lessee [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Total minimum lease payments $ 78,174 $ 89,750 $ 13,720 Effect of discounting (3,939 ) (5,177 ) (788 ) Present value of minimum lease payments 74,235 84,573 12,932 Less: current portion (20,472 ) (18,327 ) (3,172 ) 53,763 66,246 9,760 Minimum payments under finance leases Less than 12 months $ 18,448 20,186 3,508 13 - 36 months 40,615 40,253 6,667 37 - 60 months 19,111 29,311 3,545 $ 78,174 $ 89,750 $ 13,720

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of borrowings [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Senior unsecured notes (a) $ 989,306 $ 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) (8,276 ) (8,328 ) (6,752 ) 981,030 979,575 1,232,164 Less: current portion - - (16,490 ) $ 981,030 $ 979,575 $ 1,215,674
Senior secured revolving credit facilities [Member]
Statements [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2017 $ 202,075 Addition to Principal 25,000 Payments made (227,075 ) Balance, December 31, 2017 $ —
Equipment finance facility [Member]
Statements [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2017 $ 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 $ —
Senior unsecured notes [Member]
Statements [Line Items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2017 $ 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 Change in fair value of embedded derivative (prepayment option) 316 Accretion of transaction costs and premiums 1,087 Balance, December 31, 2018 $ 989,306
Unamortized transaction costs - revolving credit facilities [Member]
Statements [Line Items]
Disclosure of detailed information about unamortized transaction costs - revolving credit facilities [Table Text Block]	Balance, January 1, 2017 $ 6,752 Accretion of transaction costs (3,291 ) Transaction costs 4,867 Balance, December 31, 2017 $ 8,328 Accretion of transaction costs (1,946 ) Transaction costs 1,894 Balance, December 31, 2018 $ 8,276

Deferred revenue (Tables)

Deferred revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of changes in deferred revenue [Table Text Block]	Balance, January 1, 2017 (Restated) $ 616,246 Recognition of revenue (88,744 ) Finance costs 66,414 Effects of changes in foreign exchange 8,014 Balance, December 31, 2017 (Restated) $ 601,930 Amortization of deferred revenue Liability drawdown (96,038 ) Variable consideration adjustment 2,656 Finance costs (note 6f) 64,921 Effects of changes in foreign exchange (7,391 ) Balance, December 31, 2018 $ 566,078
Disclosure of detailed information about deferred revenue [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Current $ 86,256 $ 107,194 $ 87,411 Non-current 479,822 494,736 528,835 $ 566,078 $ 601,930 $ 616,246

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of changes in provisions [Table Text Block]	Decommis- sioning, Restricted restoration Deferred share and similar share units units 1 liabilities (note 24a ) (note 24a ) Other Total Balance, January 1, 2018 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 Net additional provisions made 9,031 973 7,493 — 17,497 Amounts used (188 ) — (6,435 ) (770 ) (7,393 ) Unwinding of discount (note 6f) 4,684 — — — 4,684 Effect of change in discount rate (462 ) — — — (462 ) Effect of foreign exchange (11,082 ) (458 ) (973 ) (74 ) (12,587 ) Effect of change in share price — (2,850 ) (7,293 ) (180 ) (10,323 ) Balance, December 31, 2018 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 liabilities (note 24a ) (note 24a ) 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 6f) 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
Disclosure of detailed information about provisions [Table Text Block]	Decommis- sioning, Restricted restoration Deferred share and similar share units units 1 December 31, 2018 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 1,234 $ 4,288 $ 8,412 $ 342 $ 14,276 Non-current 200,790 — 3,789 69 204,648 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 Decommis- sioning, restoration Deferred Restricted and similar share units share units 1 December 31, 2017 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 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 1 January 1, 2017 liabilities (note 24a ) (note 24a ) Other Total Current (note 14) $ 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, 2018
Statements [Line Items]
Disclosure of additional information about defined benefit plans [Table Text Block]	Year ended Dec. 31, 2018 Dec. 31, 2017 Opening defined benefit obligation: $ 383,054 $ 349,165 Current service costs 11,032 10,707 Past service cost related to the new collective bargaining agreement 383 10,442 Interest cost 12,009 12,602 Benefits paid from plan (29,499 ) (33,721 ) Benefits paid from employer (1,998 ) (999 ) Participant contributions 98 93 Effects of movements in exchange rates (32,015 ) 24,440 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions — 1,598 Arising from changes in financial assumptions (11,585 ) 9,402 Arising from experience adjustments (2,112 ) (675 ) Settlement payments from plan assets (120,018 ) — Loss on settlement (note 6e) 2,163 — Closing defined benefit obligation $ 211,512 $ 383,054
Disclosure of additional information about defined benefit plans, balance by member group [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan 1, 2017 Active members $ 200,591 $ 250,965 $ 235,815 Deferred members 723 4,304 3,636 Retired members 10,198 127,785 109,714 Closing defined benefit obligation $ 211,512 $ 383,054 $ 349,165
Disclosure of changes in fair value of plan assets [Table Text Block]	Year ended Dec. 31, 2018 Dec. 31, 2017 Opening fair value of plan assets: $ 341,432 $ 296,151 Interest income 11,033 11,005 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) (15,296 ) 24,437 Contributions from the employer 17,020 22,484 Employer direct benefit payments 1,998 999 Contributions from plan participants 98 93 Benefit payment from employer (1,998 ) (999 ) Administrative expenses paid from plan assets (83 ) (80 ) Benefits paid (29,499 ) (33,721 ) Settlement payments from plan assets (120,018 ) — Effects of changes in foreign exchange rates (28,892 ) 21,063 Closing fair value of plan assets $ 175,795 $ 341,432
Disclosure of net defined benefit liability (asset) [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Present value of funded defined benefit obligation $ 195,283 $ 365,655 $ 333,720 Fair value of plan assets (175,795 ) (341,432 ) (296,151 ) Present value of unfunded defined benefit obligation 16,229 17,399 15,445 Net liability arising from defined benefit obligation $ 35,717 $ 41,622 $ 53,014
Disclosure of detailed information about pension obligation [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Pension obligation - current (note 14) $ 11,854 $ 19,401 $ 24,635 Pension obligation - non-current 23,863 22,221 28,379 Total pension obligation $ 35,717 $ 41,622 $ 53,014
Disclosure of detailed information about pension expense [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Service costs: Current service cost $ 11,032 $ 10,707 Past service cost 383 10,442 Loss on settlement (note 6e) 2,163 — Total service cost 13,578 21,149 Net interest expense 976 1,597 Administration cost 83 80 Defined benefit pension expense $ 14,637 $ 22,826 Defined contribution pension expense $ 1,469 $ 908
Disclosure of detailed information about remeasurement on the net defined benefit liability [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ 15,296 $ (24,437 ) Actuarial gains arising from changes in demographic assumptions — 1,598 Actuarial losses/(gains) arising from changes in financial assumptions (11,585 ) 9,402 Actuarial gains arising from experience adjustments (2,112 ) (675 ) Defined benefit loss/(gain) related to remeasurement $ 1,599 $ (14,112 ) Total pension cost $ 17,705 $ 9,622
Disclosure of defined benefit plan, assumptions used [Table Text Block]	2018 2017 Defined benefit cost: Discount rate - benefit obligations 3.45% 3.69% Discount rate - service cost 3.50% 3.82% 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 Defined benefit obligation: Discount rate 3.73% 3.45% Expected rate of salary increase 1 2.75% 2.75% Average longevity at retirement age for current pensioners (years) 2 Males 21.1 21.0 Females 23.9 23.7 Average longevity at retirement age for current employees (future pensioners) (years) 2 Males 23.0 22.9 Females 25.6 25.5
Disclosure of fair value of plan assets [Table Text Block]	December 31, 2018 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 3,072 $ — $ — $ 3,072 Pooled equity funds 53,329 — — 53,329 Pooled fixed income funds — 91,854 — 91,854 Alternative investment funds — 26,871 — 26,871 Balanced funds — 669 — 669 $ 56,401 $ 119,394 $ — $ 175,795 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 January 1, 2017 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, 2018
Statements [Line Items]
Disclosure of additional information about other employee benefit plans [Table Text Block]	Year ended Dec. 31, 2018 Dec. 31, 2017 Opening defined benefit obligation $ 107,829 $ 89,005 Current service cost 1 3,455 2,614 Past service cost 255 — Interest cost 3,683 3,567 Effects of movements in exchange rates (8,587 ) 7,026 Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions (9,996 ) 1,172 Arising from changes in financial assumptions 2,809 6,761 Arising from experience adjustments (3,472 ) (120 ) Benefits paid (2,448 ) (2,196 ) Closing defined benefit obligation $ 93,528 $ 107,829
Disclosure of additional information about other employee benefit plans, balance by member group [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Active members $ 47,249 $ 64,460 $ 52,611 Inactive members 46,279 43,369 36,394 Closing defined benefit obligation $ 93,528 $ 107,829 $ 89,005
Disclosure of changes in fair value of assets of other employee benefits plan [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Employer contributions $ 2,448 $ 2,196 $ 1,949 Benefits paid (2,448 ) (2,196 ) (1,949 ) Closing fair value of assets $ — $ — $ —
Disclosure of net benefit liability for other employee benefits [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan 1, 2017 Unfunded benefit obligation $ 93,528 $ 107,829 $ 89,005 Vacation accrual and other - non-current 2,664 3,324 2,624 Net liability $ 96,192 $ 111,153 $ 91,629
Disclosure of detailed information about other employee benefits plan [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan 1, 2017 Other employee benefits liability - current (note 14) $ 2,564 $ 2,756 $ 2,356 Other employee benefits liability - non-current 93,628 108,397 89,273 Net liability $ 96,192 $ 111,153 $ 91,629
Disclosure of detailed information about employee future benefit expense [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Current service cost 1 $ 3,710 $ 2,614 Net interest cost 3,683 3,567 Components recognized in consolidated income statements $ 7,393 $ 6,181
Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ (9,996 ) $ 1,172 Actuarial (gains)/losses arising from changes in financial assumptions 2,809 6,761 Actuarial gains arising from changes experience adjustments (3,472 ) (120 ) Components recognized in statements of comprehensive income $ (10,659 ) $ 7,813 Total other employee future benefit cost $ (3,266 ) 13,994
Disclosure of other employee benefit plan, assumptions used [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Defined benefit cost: 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) 1 Males 21.0 21.6 Females 23.7 24.1 Dec. 31, 2018 Dec. 31, 2017 Defined benefit obligation: Discount rate 3.88% 3.64% Initial weighted average health care trend rate 5.74% 5.97% Ultimate weighted average health care trend rate 4.00% 4.00% Average longevity at retirement age for current pensioners (years) 1 Males 21.1 21.0 Females 23.9 23.7 Average longevity at retirement age for current employees (future pensioners) (years) 1 Males 23.0 22.9 Females 25.6 25.5

Income and mining taxes (Tables

Income and mining taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about effective income tax expense recovery [Table Text Block]	Year ended December 31, 2018 2017 (Restated) Current: Income tax expense Canada $ 5,251 Peru 19,103 24,523 Mining tax expense Canada 9,085 5,085 Peru 11,030 14,706 Adjustments in respect of prior years 707 (448 ) 45,176 49,943 Deferred: Income tax - origination, revaluation and/or and reversal of temporary difference Canada 25,811 2,067 Peru 10,780 29,727 United States 3,170 (46,908 ) Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference Canada 414 467 Peru (621 ) (661 ) Adjustments in respect of prior years 691 (1,416 ) 40,245 (16,724 ) $ 85,421 $ 33,219
Disclosure of deferred taxes [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Deferred income tax asset Canada $ 15,513 $ 31,937 $ 40,162 Deferred income tax liability Peru (196,452 ) (183,973 ) (203,081 ) United States (110,861 ) (107,692 ) (107,691 ) Deferred mining tax liability Canada (5,119 ) (5,614 ) (4,706 ) Peru (11,658 ) (12,124 ) (12,785 ) (324,090 ) (309,403 ) (328,263 ) Net deferred tax liability balance, end of year $ (308,577 ) $ (277,466 ) $ (288,101 )
Disclosure of changes in deferred tax assets and liabilities [Table Text Block]	Year ended Year ended December 31, December 31, 2018 2017 (Restated) Net deferred tax liability balance, beginning of year $ (277,466 ) $ (288,101 ) Deferred tax (expense) recovery (40,245 ) 16,724 OCI transactions 520 (3,845 ) Items charged directly to equity — 2,238 Foreign currency translation on the deferred tax liability 8,614 (4,482 ) Net deferred tax liability balance, end of year $ (308,577 ) $ (277,466 )
Disclosure of reconciliation to statutory tax rate [Table Text Block]	Year ended December 31, 2018 2017 (Restated) Statutory tax rate 27.00% 27.00% Tax expense at statutory rate $ 46,126 $ 46,685 Effect of: Deductions related to mining taxes (5,976 ) (6,075 ) Adjusted income taxes 40,150 40,610 Mining tax expense 19,214 19,367 59,364 59,977 Permanent differences related to: Capital items (2,903 ) 1,462 Other income tax permanent differences (454 ) 338 Impact of remeasurement on decommissioning liability 3,898 15,290 Temporary income tax differences not recognized 4,449 15,376 Impact related to differences in tax rates in foreign operations 9,594 4,605 Impact of changes to statutory tax rates 45 (52,855 ) Foreign exchange on non-monetary items 11,408 (9,387 ) Impact related to tax assessments and tax return amendments 20 (1,587 ) Tax expense $ 85,421 33,219
Disclosure of temporary differences recognized [Table Text Block]	Balance sheet Income Statement Year ended Dec. 31, Dec. 31, Jan. 1, Dec. 31, Dec. 31, 2018 2017 2017 2018 2017 (Restated) (Restated) (Restated) Deferred income tax (liability) asset/ expense (recovery) Property, plant and equipment $ (83,407 ) $ (102,053 ) $ (71,837 ) $ (18,646 ) $ 30,216 Pension obligation 7,817 10,034 13,092 2,739 (787 ) Other employee benefits 13,488 16,742 17,778 3,254 1,036 Non-capital losses 72,470 91,495 59,034 19,025 (32,461 ) Share issue and debt costs 10,896 15,707 16,319 4,807 2,850 Other (5,751 ) 12 5,776 7,681 1,657 Deferred income tax asset / expense (recovery) 15,513 31,937 40,162 18,860 2,511 Deferred income tax liability (asset)/ (recovery) expense Property, plant and equipment 339,037 320,036 389,502 25,456 (69,466 ) Pension obligation — — (12,150 ) — 12,150 Other employee benefits 240 192 (14,806 ) 48 14,998 Asset retirement obligations (918 ) (789 ) (11,357 ) (129 ) 10,568 Non-capital losses (27,374 ) (27,539 ) (46,500 ) 165 18,961 Other (3,672 ) (235 ) 6,083 (3,439 ) (6,318 ) Deferred income tax liability/ (recovery) expense 307,313 291,665 310,772 22,101 (19,107 ) Deferred income tax liability/ (recovery) expense $ (291,800 ) $ (259,728 ) $ (270,610 ) $ 40,961 $ (16,596 )
Disclosure of temporary differences not recognized [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Property, plant and equipment $ — $ 32,089 Capital losses 200,455 223,916 Other employee benefits 77,166 78,871 Asset retirement obligations 175,091 174,448 Non-capital losses 116,542 104,171 Temporary differences not recognized $ 569,254 $ 613,495
Disclosure of temporary differences - deferred mining tax assets and liabilities [Table Text Block]	Dec. 31, 2017 Jan. 1, 2017 Dec. 31, 2018 (Restated) (Restated) Canada Property, plant and equipment $ (5,119 ) $ (5,614 ) $ (4,706 ) Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 Peru (Restated) (Restated) Property, plant and equipment $ (11,658 ) $ (12,124 ) $ (12,785 )

Share capital (Tables)

Share capital (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about shares, activity explanatory [Table Text Block]	Year ended Year ended Dec. 31, 2018 Dec. 31, 2017 Common Common shares Amount shares Amount Balance, beginning of year 261,271,188 $ 1,777,409 237,271,188 $ 1,588,319 Equity issuance — — 24,000,000 195,295 Share issue costs, net of tax — (80 ) — (6,205 ) Warrants exercised 963 11 — — Balance, end of period 261,272,151 $ 1,777,340 261,271,188 $ 1,777,409

Share-based payment (Tables)

Share-based payment (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of number and weighted average exercise prices of share options [Table Text Block]	Year ended Year ended Dec. 31, 2018 Dec. 31, 2017 Weighted- Weighted Number of average Number of average shares subject exercise price shares subject exercise price to option C$ to option C$ Balance, beginning of year 523,352 $ 15.86 1,470,377 $ 19.24 Forfeited — $ — (20,002 ) $ 15.86 Expired (523,352 ) $ 15.86 (927,023 ) $ 21.22 Balance, end of year — $ — 523,352 $ 15.86
Disclosure of range of exercise prices of outstanding share options [Table Text Block]	Dec. 31, 2017 Weighted- average Weighted- Range of Number of remaining average Number of Weighted exercise prices options contractual live exercise price options average C$ outstanding (years) C$ exercisable exercise price $ 15.86 523,352 0.2 $ 15.86 523,352 15.86
Deferred Share Unit [Member]
Statements [Line Items]
Disclosure of number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2018 Dec. 31, 2017 Granted during the year: Number of units 158,886 130,964 Weighted average price (C$/unit) $ 7.91 $ 8.59 Expenses recognized during the year 1 $ (1,877 ) $ 2,982 Payments made during the year (note 19) $ — $ 638
Restricted Share Unit [Member]
Statements [Line Items]
Disclosure of number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2018 Dec. 31, 2017 Number of units, beginning of year 3,405,713 3,492,408 Number of units granted during the year 1,031,701 987,194 Credits for dividends 9,724 8,156 Number of units forfeited during the year (21,190 ) (201,946 ) Number of units vested (759,081 ) (880,099 ) Number of units, end of year 1 3,666,867 3,405,713 Weighted average price - granted (C$/unit) $ 10.33 $ 10.60 (Gain) expenses recognized during the year 2 $ (496 ) 12,937 Payments made during the year (note 19) $ 6,435 5,491

Earnings per share (Tables)

Earnings per share (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Earnings per share [Table Text Block]	Year ended December 31, 2018 2017 Basic and diluted weighted average common shares outstanding 261,271,621 243,500,696

Financial instruments (Tables)

Financial instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of fair value measurement [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 Jan. 1, 2017 (Restated) (Restated) Recurring measurements FV CV FV CV FV CV Financial assets at amortized cost Cash and cash equivalents 1 $ 515,497 $ 515,497 $ 356,499 $ 356,499 $ 146,864 $ 146,864 Restricted cash 1 3,738 3,738 206 206 17,148 17,148 Fair value through profit or loss Trade and other receivables 1,2 126,311 126,311 159,626 159,626 128,983 128,983 Non-hedge derivative assets 3 6,628 6,628 2,841 2,841 3,397 3,397 Prepayment option - embedded derivatives 7 3,664 3,664 3,980 3,980 4,430 4,430 Investments at FVTPL 4 15,159 15,159 22,255 22,255 13,700 13,700 Total financial assets 670,997 670,997 545,407 545,407 314,522 314,522 Financial liabilities at amortized cost Trade and other payables 1,2 164,628 164,628 192,448 192,448 163,027 163,027 Finance leases 74,235 74,235 84,573 84,573 12,932 12,932 Other financial liabilities 5 17,425 21,361 19,625 22,568 17,231 22,998 Senior unsecured notes 6 988,294 992,970 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 (8,276 ) (8,276 ) (8,328 ) (8,328 ) (6,752 ) (6,752 ) Fair value through profit or loss Embedded derivatives 3 7,201 7,201 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 3 2,634 2,634 16,140 16,140 10,682 10,682 Total financial liabilities 1,246,141 1,254,753 1,396,424 1,308,510 1,497,884 1,454,477 Net financial liability $ (575,144 ) $ (583,756 ) $ (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 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 All 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. 5 These financial liabilities relate to agreements with communities near the Constancia project in Peru (note 15). 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 17) has been determined using the quoted market price at the year end. 7 Fair value of the prepayment option embedded derivative related to the long-term debt (note 17) 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.
Disclosure of significant unobservable inputs used in fair value measurement of assets and liabilities [Table Text Block]	December 31, 2018 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 6,628 $ — $ 6,628 Investments at FVTPL 15,159 — — 15,159 Prepayment option embedded derivative — 3,664 — 3,664 $ 15,159 $ 10,292 $ — $ 25,451 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ — $ 7,201 $ — $ 7,201 Non-hedge derivatives — 2,634 — 2,634 $ — $ 9,835 $ — $ 9,835 December 31, 2017 (Restated) Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 2,841 $ — $ 2,841 Investments at FVTPL 21,973 282 — 22,255 Prepayment option embedded derivative — 3,980 — 3,980 $ 21,973 $ 7,103 $ — $ 29,076 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 January 1, 2017 (Restated) Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ — $ 3,397 $ — $ 3,397 Investments at FVTPL 12,018 192 1,490 13,700 Prepayment option embedded derivative — 4,430 — 4,430 $ 12,018 $ 8,019 $ 1,490 $ 21,527 Financial liabilities measured at fair value Financial assets at FVTPL: Embedded derivatives $ — $ 86 $ — $ 86 Non-hedge derivatives — 10,682 — 10,682 Option liability — 570 — 570 Warrant liability 7,588 — — 7,588 $ 7,588 $ 11,338 $ — $ 18,926
Disclosure of detailed information about foreign currency risk [Table Text Block]	Dec. 31, 2018 Dec. 31, 2017 CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalent $ 11,498 $ 29,740 $ 13,934 $ 9,518 $ 20,597 $ 3,692 Trade and other receivables 711 42,056 1,272 530 77,824 1,114 Other financial assets 15,159 — — 22,255 — — Trade and other payables (5,341 ) (3,133 ) (19,513 ) (6,115 ) (9,687 ) (17,917 ) Other financial liabilities — — (21,361 ) (6,961 ) — (22,568 ) $ 22,027 $ 68,663 $ (25,668 ) $ 19,227 $ 88,734 $ (35,679 )
Disclosure of foreign currency risk [Table Text Block]	Would have changed Would have changed December 31, 2018 Change of: 2018 after-tax profit by: 2018 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 5.0 million $ — million USD/CAD exchange rate 1 - 10% (6.0 ) million — million USD/PEN exchange rate 2 + 10% 1.5 million — million USD/PEN exchange rate 2 - 10% (1.8 ) million — million Would have changed Would have changed December 31, 2017 (Restated) Change of: 2017 after-tax profit by: 2017 after-tax OCI by: USD/CAD exchange rate 1 + 10% $ 3.6 million $ — million USD/CAD exchange rate 1 - 10% (4.4 ) million — million USD/PEN exchange rate 2 + 10% 2.1 million — million USD/PEN exchange rate 2 - 10% (2.6 ) million — million
Disclosure of commodity price risk [Table Text Block]	Would have changed 2018 after-tax profit December 31, 2018 Change of: by: Copper prices ($/lb) 3 + $ 0.30 $ (3.1 ) million Copper prices ($/lb) 3 — $ 0.30 3.1 million Zinc prices ($/lb) 4 + $ 0.10 0.5 million Zinc prices ($/lb) 4 — $ 0.10 (0.5 ) million Would have changed December 31, 2017 Change of: 2017 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (2.3 ) million Copper prices ($/lb) 3 — $ 0.30 2.3 million Zinc prices ($/lb) 4 + $ 0.10 0.9 million Zinc prices ($/lb) 4 — $ 0.10 (0.9 ) million
Disclosure of share price risk explanatory [Table Text Block]	Would have changed 2018 Would have changed December 31, 2018 Change of: after-tax profit by: 2018 after-tax OCI by: Share prices + 25% $ 3.8 million $ — million Share prices - 25% (3.8 ) million — million December 31, 2017 Would have changed 2017 Would have changed (Restated) Change of: after-tax profit by: 2017 after-tax OCI by: Share prices + 25% $ 5.0 million $ — million Share prices - 25% (5.0 ) million — million
Disclosure of interest rate risk [Table Text Block]	Change Would have changed Would have changed December 31, 2018 of: 2018 after-tax profit by: 2018 after-tax OCI by: Interest rates + 2.00% $ (3.3 ) million $ — million Interest rates - 2.00% 3.2 million — million December 31, 2017 Change Would have changed Would have changed of: 2017 after-tax profit by: 2017 after-tax OCI by: Interest rates + 2.00% $ 0.4 million $ — million Interest rates - (2.8 ) million — million
Disclosure of liquidity risk [Table Text Block]	Carrying Contractual 12 months 13 - 36 37 - 60 More than amount cash flows or less months months 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 515,497 $ 515,497 $ 515,497 — — — Trade and other receivables 126,311 136,913 112,258 11,440 13,215 Non-hedge derivative assets 6,628 6,628 6,628 — — — $ 648,436 $ 659,038 $ 634,383 $ 11,440 $ 13,215 $ — Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (164,628 ) (164,628 ) (164,628 ) — — — Other financial liabilities (21,361 ) (31,854 ) (3,719 ) (4,757 ) (3,068 ) (20,310 ) Long-term debt, including embedded derivatives (981,030 ) (1,439,821 ) (79,263 ) (156,933 ) (535,000 ) (668,625 ) Finance lease liabilities (74,235 ) (78,174 ) (18,448 ) (40,615 ) (19,111 ) — $ (1,241,254 ) $ (1,714,477 ) $ (266,058 ) $ (202,305 ) $ (557,179 ) $ (688,935 ) Derivative financial liabilities Non hedge derivative contracts (2,634 ) (2,634 ) (2,634 ) — — — (2,634 ) (2,634 ) (2,634 ) — — — Carrying Contractual 12 months or 13 - 36 37 - 60 More than 60 Dec. 31, 2017 amount cash flows less months months months Assets used to manage liquidity risk Cash and cash equivalents $ 356,499 $ 356,499 $ 356,499 $ — $ — $ — Trade and other receivables 159,626 147,196 124,134 12,403 10,659 — Non-hedge derivative assets 2,841 2,841 2,841 — — — $ 518,966 $ 506,536 $ 483,474 $ 12,403 $ 10,659 $ — Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (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 embedded derivatives (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 ) $ — $ —

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of maturity analysis of operating lease payments [Table Text Block]	2018 2017 Within one year $ 42,019 $ 5,682 After one year but not more than five years 19,374 12,291 More than five years 2,055 1,781 $ 63,448 $ 19,754

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of subsidiaries [Table Text Block]	Beneficial ownership of ultimate controlling party (Hudbay Minerals Inc.) Entity's Name Jurisdiction Business Parent 2018 2017 Marketing and British Holding Exploration/de British Virgin Precious British Holding HudBay Arizona (US) Exploration/de Holding Rosemont Copper Company 1 Arizona velopment Corporation 100% 100%
Disclosure of information about key management personnel [Table Text Block]	2018 2017 Short-term employee benefits 1 $ 8,652 $ 8,654 Post-employment benefits 762 777 Long-term share-based awards 5,970 6,110 $ 15,384 $ 15,541

Supplementary cash flow infor_2

Supplementary cash flow information (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of detailed information about supplemental cash flow information [Table Text Block]	Year ended December 31, 2018 2017 Change in: Trade and other receivables $ 16,198 $ (8,979 ) Other financial assets/liabilities (17,290 ) 6,620 Inventories (32 ) (18,690 ) Prepaid expenses (38 ) (4,619 ) Trade and other payables (19,608 ) (6,336 ) Change in taxes payable/receivable, net 7,881 39,326 Provisions and other liabilities (1,030 ) 1,693 $ (13,919 ) $ 9,015

Segmented information (Tables)

Segmented information (Tables)	12 Months Ended
	Dec. 31, 2018
Statements [Line Items]
Disclosure of geographical areas [Table Text Block]	Year ended December 31, 2018 Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 667,322 $ 805,044 $ — $ — $ 1,472,366 Cost of sales Mine operating costs 412,760 353,199 — — 765,959 Depreciation and amortization 121,515 211,152 — — 332,667 Gross profit 133,047 240,693 — — 373,740 Selling and administrative expenses — — — 27,243 27,243 Exploration and evaluation 12,302 5,640 — 10,628 28,570 Other operating expense (income) 5,433 11,739 539 1,360 19,071 Results from operating activities $ 115,312 $ 223,314 $ (539 )$ (39,231 ) $ 298,856 Finance income (8,450 ) Finance expenses 152,000 Other finance gain (15,531 ) Profit before tax 170,837 Tax expense 85,421 Profit for the year $ 85,416 Year ended December 31, 2017 (Restated) Corporate and other Manitoba Peru Arizona activities Total Revenue from external customers $ 712,244 $ 690,095 $ — $ — $ 1,402,339 Cost of sales Mine operating costs 392,863 302,865 — — 695,728 Depreciation and amortization 118,770 178,700 — — 297,470 Gross profit 200,611 208,530 — — 409,141 Selling and administrative expenses — — — 42,283 42,283 Exploration and evaluation 5,649 1,442 — 8,383 15,474 Other operating (income) expense (56 ) (6,612 ) 517 (6,289 ) (12,440 ) Asset impairment 11,320 — — — 11,320 Results from operating activities $ 183,698 $ 213,700 $ (517 ) $ (44,377 ) $ 352,504 Finance income (2,849 ) Finance expenses 169,442 Other finance losses 13,000 Profit before tax 172,911 Tax expense 33,219 Profit for the year $ 139,692
Disclosure of geographical areas, assets and liabilities [Table Text Block]	December 31, 2018 Corporate and other Manitoba Peru Arizona activities Total Total assets $ 621,253 $ 2,751,525 $ 896,693 $ 416,164 $ 4,685,635 Total liabilities 424,576 921,773 115,470 1,044,960 2,506,779 Property, plant and equipment 1 572,947 2,353,229 868,921 24,715 3,819,812 December 31, 2017 (Restated) Corporate and other Manitoba Peru Arizona activities Total Total assets $ 738,967 $ 2,750,114 $ 856,589 $ 382,346 $ 4,728,016 Total liabilities 510,506 932,423 110,945 1,061,797 2,615,671 Property, plant and equipment 619,476 2,503,900 836,759 4,098 3,964,233
Disclosure of geographical areas, additions to property, plant and equipment [Table Text Block]	December 31, 2018 Corporate and other Manitoba Peru Arizona activities Total Additions to property, plant and equipment $ 123,896 $ 55,818 $ 19,846 $ 22 $ 199,582 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
Disclosure of geographical areas, revenue by customer location [Table Text Block]	2018 2017 (Restated) Revenue by customer location 1 Canada $ 553,411 $ 461,033 United States 211,681 159,085 Switzerland 253,165 236,467 Germany 52,530 144,684 China 140,440 145,935 Peru 65,721 101,033 Philippines 84,687 120,199 United Kingdom 68,346 — Other 42,385 33,903 $ 1,472,366 $ 1,402,339

Acquisition of Mason (Narrative

Acquisition of Mason (Narrative) (Details) - Mason Resources Corp. ("Mason") $ / shares in Units, $ in Thousands, $ in Thousands	1 Months Ended
	Dec. 18, 2018USD ($)	Dec. 19, 2018USD ($)	Dec. 19, 2018CAD ($)$ / shares	Dec. 18, 2018CAD ($)
Statements [Line Items]
Acquisition cost per share			$ 0.40
Total cash consideration, including transaction costs		$ 20,797	$ 27,972
Cash		20,126	27,070
Transaction costs		$ 671	$ 902
Equity instruments held	$ 3,228			$ 4,342
Ownership percentage	13.80%

Revenue and expenses (Narrative

Revenue and expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Statements [Line Items]
Employee share purchase plan, matching contribution, percentage	75.00%	75.00%
Impairment loss recognised in profit or loss, property, plant and equipment	$ 11,320
Bottom of range [Member]
Statements [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	1.00%	1.00%
Top of range [Member]
Statements [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	10.00%	10.00%
Manitoba [Member]
Statements [Line Items]
Profit sharing plan, percentage	10.00%	10.00%
Peru [Member]
Statements [Line Items]
Profit sharing plan, percentage	8.00%	8.00%

Trade and other receivables (Na

Trade and other receivables (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Statutory receivables	$ 12,764	$ 13,961	$ 43,808
Peru [Member]
Statements [Line Items]
Statutory receivables	$ 11,670	$ 10,905	$ 42,273

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Cost of inventories recognised as expense during period	$ 975,354	$ 855,141

Property, plant and equipment_2

Property, plant and equipment (Narrative) (Details) - Cash-generating units [member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / lb	Dec. 31, 2016USD ($)$ / lb	Dec. 31, 2015USD ($)
Statements [Line Items]
Cash flow calculations utilized a copper price in 2019 /lb | $ / lb	3
Cash flow calculations utilized a copper price in 2020 /lb | $ / lb	3.10
Cash flow calculations utilized a copper price in 2021-2022 /lb | $ / lb	3.20
Cash Flow Calculations Utilized Long-Term Copper Price | $ / lb	3.10	3
Cash Flow Calculations Utilized Molybdenum Long-Term Prices | $ / lb	11	11
Peru [Member]
Statements [Line Items]
Explanation of period over which management has projected cash flows	18 years
Discount rate applied to cash flow projections	6.25%	7.50%
Estimated value of mineral resources not included in LOM | $	$ 237,500		$ 272,000
Decrease In Average LOM Copper Price	10.00%
Increase in real discount rate, number of percentage points	1
Decrease In FVLCD On Decrease In Average LOM Copper Price | $	$ (368,000)	$ (381,000)
Decrease In FVLCD On Increase In Real Discount Rate | $	(105,000)	(143,000)
Amount by which unit's recoverable amount exceeds its carrying amount | $	$ 165,000	$ 75,000
Arizona [Member]
Statements [Line Items]
Explanation of period over which management has projected cash flows	22 years
Discount rate applied to cash flow projections	7.50%	8.75%
Estimated value of mineral resources not included in LOM | $	$ 287,900		$ 212,000

Other financial liabilities (Na

Other financial liabilities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018warrant$ / shares
Statements [Line Items]
Number of warrants granted in share-based payment arrangement | warrant	22,391,490
Weighted average exercise price of warrants granted in share-based payment arrangement | $ / shares	$ 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 was equal to or above $1,400/oz on May 4, 2018.

Finance lease obligations (Narr

Finance lease obligations (Narrative) (Details) - Finance lease obligations [Member]	Dec. 31, 2018
Bottom of range [Member]
Statements [Line Items]
Borrowings, interest rate	1.95%
Top of range [Member]
Statements [Line Items]
Borrowings, interest rate	4.45%

Long-term debt (Narrative) (Det

Long-term debt (Narrative) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Senior unsecured notes [Member]
Statements [Line Items]
Face amount of debt instruments	$ 1,000,000
Senior Notes Due 2023 [Member]
Statements [Line Items]
Face amount of debt instruments	$ 400,000
Borrowings, interest rate	7.25%
Senior Notes Due 2025 [Member]
Statements [Line Items]
Face amount of debt instruments	$ 600,000
Borrowings, interest rate	7.625%
Senior secured revolving credit facilities [Member] | Manitoba [Member]
Statements [Line Items]
Letters of credit	$ 50,973
Senior secured revolving credit facilities [Member] | Peru [Member]
Statements [Line Items]
Letters of credit	$ 77,567

Deferred revenue (Narrative) (D

Deferred revenue (Narrative) (Details) - USD ($) $ in Thousands	Nov. 04, 2013	Feb. 28, 2010
Statements [Line Items]
Deposits from customers	$ 885,000	$ 230,000
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) $400 per ounce (for gold) and $5.90 per ounce (for silver), subject to 1% annual escalation after three years.	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.

Provisions (Narrative) (Details

Provisions (Narrative) (Details)	Dec. 31, 2018	Dec. 31, 2017
Bottom of range [Member]
Statements [Line Items]
Provision estimates, discount rate used	1.80%	1.43%
Top of range [Member]
Statements [Line Items]
Provision estimates, discount rate used	3.02%	2.74%

Pension obligations (Narrative)

Pension obligations (Narrative) (Details) - Pension obligations [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Year	Dec. 31, 2017USD ($)Year
Statements [Line Items]
Settlement payments from plan assets	$ (120,018)	$ 0
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 15,066
Weighted average duration of defined benefit obligation | Year	17.3	15.8
Return on plan assets, percentage	(2.60%)	11.50%
Active members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation | Year	17.6	18.4
Deferred members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation | Year	14	26.9
Retired members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation | Year	10.4	10.2
Actuarial assumption of discount rates [Member]
Statements [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	$ (16,427)
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 18,686
Actuarial assumption of expected rates of salary increases [Member]
Statements [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	$ 2,927
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (2,610)
Actuarial assumptions of life expectancy [Member]
Statements [Line Items]
Reasonably possible increase in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 1,705
Reasonably possible decrease in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (1,764)

Other employee benefits (Narrat

Other employee benefits (Narrative) (Details) - Other employee benefits [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)Year	Dec. 31, 2017Year
Statements [Line Items]
Weighted average duration of non-pension post employment obligation | Year	18.6	18.9
Inactive members [Member]
Statements [Line Items]
Weighted average duration of non-pension post employment obligation | Year	13.4	13.1
Active members [Member]
Statements [Line Items]
Weighted average duration of non-pension post employment obligation | Year	23.7	22.8
Actuarial assumption of discount rates [Member]
Statements [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	$ (7,754)
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 8,886
Actuarial assumption of health care cost trend rates [Member]
Statements [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	$ 18,013
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (14,029)
Actuarial assumptions of life expectancy [Member]
Statements [Line Items]
Reasonably possible increase in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3,417
Reasonably possible decrease in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (3,392)

Income and mining taxes (Narrat

Income and mining taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 569,254	$ 613,495
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 2018 and expire between 2026 and 2038. The Group incurred United States net operating losses between 2004 and 2018 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2014 to 2016 which have a four year carry forward period.
Mining tax effect of temporary differences recognized [Member]
Statements [Line Items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 8,469	$ 8,740

Share capital (Narrative) (Deta

Share capital (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended						12 Months Ended
	Feb. 19, 2019CAD ($)$ / shares	Sep. 28, 2018USD ($)	Mar. 29, 2018USD ($)	Sep. 29, 2017USD ($)	Sep. 27, 2017USD ($)shares	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018$ / shares	Dec. 31, 2017USD ($)	Dec. 31, 2017$ / shares
Statements [Line Items]
Increase (decrease) in number of shares outstanding | shares					24,000,000
Proceeds from issuing shares					$ 189,090
Dividends paid		$ 2,019	$ 2,026	$ 1,912		$ 1,774	$ 4,045		$ 3,686
Dividends declared, amount per share | $ / shares	$ 0.01							$ 0.01		$ 0.01
Dividends declared	$ 2,613

Share-based payments (Narrative

Share-based payments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Liability related to deferred share unit plan	$ 4,288	$ 6,623
Liability related to restricted share unit plan	$ 12,201	$ 19,409
Restricted share units vested, but unreleased and unpaid	1,842,837	587,633
Stock option plan [Member]
Statements [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. As of December 31, 2018, all options had either been exercised, or expired.
Maximum number of common shares purchaseable under stock option plan	13,000,000

Capital management (Narrative)

Capital management (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Long-term debt	$ 981,030	$ 979,575	$ 1,215,674
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864

Financial instruments (Narrativ

Financial instruments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)warrantTonneOunce$ / lb$ / shares$ / OZ$ / Tonne	Dec. 31, 2017USD ($)TonneOunce$ / lb$ / OZ$ / Tonne	Jan. 01, 2017USD ($)
Statements [Line Items]
Tonnes of copper fixed for floating swaps | Tonne	29,950	34,500
Average price recorded for copper fixed for floating swaps | $ / lb	2.77	3.10
Tonnes of zinc forward sales contracts | Tonne	2,925	2,808
Tonnes of copper contracts awaiting final provisional pricing | Tonne	30,519	38,027
Tonnes of zinc contracts awaiting final provisional pricing | Tonne	199	6,412
Ounces of gold contracts awaiting final provisional pricing | Ounce	15,528	24,553
Ounces of silver contracts awaiting final provisional pricing | Ounce	96,646	172,886
Average price recorded for copper contracts subject to final settlement | $ / lb	2.69	3.29
Average price recorded for zinc contracts subject to final settlement | $ / lb	1.13	1.51
Average price recorded for gold contracts subject to final settlement | $ / OZ	1,279	1,309
Average price recorded for silver contracts subject to final settlement | $ / OZ	15.45	17.10
Derivative financial assets	$ 6,628	$ 2,841	$ 3,397
Derivative financial liabilities	2,634	16,140	10,682
Aggregate fair value of other embedded derivatives	7,201	1,533	86
Prepayment option - embedded derivative	$ 3,664	$ 3,980	4,430
Warrants issued, acquisition | warrant	22,391,490
Warrants issued, acquisition, exercise price | $ / shares	15
Deposits and other investments with Schedule 1 Canadian banks, as a percentage of total cash and cash equivalents	74.00%	97.00%
Percentage of entity's trade receivables that are insured	95.00%	75.00%
Percentage of receivables that represent largest customers	78.00%	77.00%
Bottom of range [Member]
Statements [Line Items]
Range of zinc forward sales contracts prices | $ / Tonne	2,400	2,534
Top of range [Member]
Statements [Line Items]
Range of zinc forward sales contracts prices | $ / Tonne	3,203	3,292
Copper fixed for floating swaps [Member]
Statements [Line Items]
Derivative financial assets	$ 4,171
Derivative financial liabilities		$ 13,786	8,657
Non-hedge derivative zinc contracts [Member]
Statements [Line Items]
Derivative financial assets		487	1,372
Derivative financial liabilities	177
Provisional pricing - copper and zinc [Member]
Statements [Line Items]
Derivative financial assets		17,427	12,538
Derivative financial liabilities	6,351
Provisional Pricing Other Embedded Derivatives Member
Statements [Line Items]
Aggregate fair value of other embedded derivatives		1,533	$ 86
Pampacancha Delivery Obligation [Member]
Statements [Line Items]
Aggregate fair value of other embedded derivatives	$ 7,201

Commitments and contingencies_2

Commitments and contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Cost of operating leases recognized expense	$ 17,269	$ 4,972
Canada [Member]
Statements [Line Items]
Capital commitments	2,972
Peru [Member]
Statements [Line Items]
Capital commitments	38,784
Rosemont project in Arizona [Member]
Statements [Line Items]
Capital commitments	166,823
Rosemont project in Arizona [Member] | Amounts which cannot be terminated [Member]
Statements [Line Items]
Capital commitments	$ 83,180

Related parties (Narrative) (De

Related parties (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018
Statements [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 infor_3

Supplementary cash flow information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Increase to property, plant and equipment assets due to remeasurements of decommissioning and restoration liabilities	$ 8,998	$ 10,661
Additions related to capital additions under finance lease, property, plant and equipment	$ 10,588	3,234
Proceeds from sale leaseback		$ 67,275

Segmented information (Narrativ

Segmented information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer 1 [Member]
Statements [Line Items]
Percentage of entity's revenue	26.00%	27.00%
Customer 2 [Member]
Statements [Line Items]
Percentage of entity's revenue	9.00%	11.00%
Customer 3 [Member]
Statements [Line Items]
Percentage of entity's revenue	8.00%	11.00%
Customer 4 [Member]
Statements [Line Items]
Percentage of entity's revenue	7.00%	5.00%
Customer 5 [Member]
Statements [Line Items]
Percentage of entity's revenue	5.00%
Customer 6 [Member]
Statements [Line Items]
Percentage of entity's revenue	5.00%

Disclosure of detailed informat

Disclosure of detailed information about estimated useful life or depreciation rate explanatory (Details)	12 Months Ended
	Dec. 31, 2018
Equipments Member
Statements [Line Items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 21 years
Other plant assets [Member]
Statements [Line Items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 21 years / unit-of-production

Disclosure of new standards ado

Disclosure of new standards adopted, impact summary consolidated balance sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Property, plant and equipment	$ 3,819,812	$ 3,964,233	$ 3,953,752
Deferred tax assets	15,513	31,937	40,162
Deferred revenue (current)	86,256	107,194	87,411
Deferred revenue (non-current)	479,822	494,736	528,835
Deferred tax liabilities	324,090	309,403	328,263
Reserves	(41,254)	(26,463)	(53,633)
Retained earnings	$ 442,770	361,399	225,393
As previously reported [Member]
Statements [Line Items]
Property, plant and equipment		3,880,894	3,865,823
Deferred tax assets		35,989	45,103
Deferred revenue (current)		49,907	65,619
Deferred revenue (non-current)		448,137	472,233
Deferred tax liabilities		302,092	320,536
Reserves		(10,300)	(42,040)
Retained earnings		377,146	216,933
Adjustments due to IFRS 9 [Member]
Statements [Line Items]
Property, plant and equipment		0	0
Deferred tax assets		0	0
Deferred revenue (current)		0	0
Deferred revenue (non-current)		0	0
Deferred tax liabilities		0	0
Reserves		(10,424)	(5,025)
Retained earnings		10,424	5,025
Adjustments due to IFRS 15 [Member]
Statements [Line Items]
Property, plant and equipment		83,339	87,929
Deferred tax assets		(4,052)	(4,941)
Deferred revenue (current)		57,287	21,792
Deferred revenue (non-current)		46,599	56,602
Deferred tax liabilities		7,311	7,727
Reserves		(5,739)	(6,568)
Retained earnings		$ (26,171)	$ 3,435

Disclosure of new standards a_2

Disclosure of new standards adopted, impact summary consolidated income statement (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Revenue	$ 1,472,366	$ 1,402,339
Depreciation and amortization	332,667	297,470
Finance expenses	152,000	169,442
Other finance loss	(15,531)	13,000
Profit (loss) before tax	170,837	172,911
Tax expense	85,421	33,219
Profit for the year	85,416	139,692
Other comprehensive income for the year	$ (14,791)	$ 27,170
Earnings (loss) per share - Basic and diluted	$ 0.33	$ 0.57
As previously reported [Member]
Statements [Line Items]
Revenue		$ 1,362,553
Depreciation and amortization		292,880
Finance expenses		103,028
Other finance loss		18,401
Profit (loss) before tax		198,728
Tax expense		34,829
Profit for the year		163,899
Other comprehensive income for the year		$ 31,740
Earnings (loss) per share - Basic and diluted		$ 0.67
Adjustments due to IFRS 9 [Member]
Statements [Line Items]
Revenue		$ 0
Depreciation and amortization		0
Finance expenses		0
Other finance loss		(5,401)
Profit (loss) before tax		5,401
Tax expense		0
Profit for the year		5,401
Other comprehensive income for the year		$ (5,401)
Earnings (loss) per share - Basic and diluted		$ 0.02
Adjustments due to IFRS 15 [Member]
Statements [Line Items]
Revenue		$ 39,786
Depreciation and amortization		4,590
Finance expenses		66,414
Other finance loss		0
Profit (loss) before tax		(31,218)
Tax expense		(1,610)
Profit for the year		(29,608)
Other comprehensive income for the year		$ 831
Earnings (loss) per share - Basic and diluted		$ (0.12)

Disclosure of new standards a_3

Disclosure of new standards adopted, impact summary consolidated cash flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Profit for the year	$ 85,416	$ 139,692
Tax expense	85,421	33,219
Depreciation and amortization	333,144	297,825
Net finance expense	143,550	166,593
Change in deferred revenue related to stream	(93,382)	(88,744)
Gain on investments at FVTPL		(3,511)
Loss on available-for-sale investments	3,798	0
Other and foreign exchange	$ (8,571)	4,310
As previously reported [Member]
Statements [Line Items]
Profit for the year		163,899
Tax expense		34,829
Depreciation and amortization		293,235
Net finance expense		100,179
Change in deferred revenue related to stream		(48,958)
Gain on investments at FVTPL		0
Loss on available-for-sale investments		1,970
Other and foreign exchange		4,230
Adjustments due to IFRS 9 [Member]
Statements [Line Items]
Profit for the year		5,401
Tax expense		0
Depreciation and amortization		0
Net finance expense		0
Change in deferred revenue related to stream		0
Gain on investments at FVTPL		(3,511)
Loss on available-for-sale investments		(1,970)
Other and foreign exchange		80
Adjustments due to IFRS 15 [Member]
Statements [Line Items]
Profit for the year		(29,608)
Tax expense		(1,610)
Depreciation and amortization		4,590
Net finance expense		66,414
Change in deferred revenue related to stream		(39,786)
Gain on investments at FVTPL		0
Loss on available-for-sale investments		0
Other and foreign exchange		$ 0

Disclosure of detailed inform_2

Disclosure of detailed information about acquisition date fair value of the major classes of consideration (Details) - Mason Resources Corp. ("Mason") $ in Thousands, $ in Thousands	Dec. 19, 2018USD ($)	Dec. 19, 2018CAD ($)	Dec. 18, 2018USD ($)Share	Dec. 18, 2018CAD ($)Share
Statements [Line Items]
Cash	$ 20,126	$ 27,070
Transaction costs	671	902
Total cash consideration	20,797	27,972
Fair value of shares previously owned by the Group (10,854,170 shares)			$ 3,228	$ 4,342
Total consideration	$ 24,025	$ 32,314
Number of shares owned			10,854,170	10,854,170

Disclosure of detailed inform_3

Disclosure of detailed information about acquisition date fair value of the major classes of asset and liabilities (Details) - Mason Resources Corp. ("Mason") $ in Thousands	Dec. 19, 2018USD ($)
Statements [Line Items]
Fair value, Cash	$ 1,747
Fair value, Other assets	624
Fair value, Mineral properties	21,654
Fair value, Total assets acquired	$ 24,025

Disclosure of detailed inform_4

Disclosure of detailed information about revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Copper		$ 963,063	$ 927,029
Zinc		357,396	347,680
Gold		149,043	137,326
Silver		85,808	76,850
Molybdenum		20,995	9,381
Other		4,726	4,992
Revenue from sale of goods		1,581,031	1,503,258
Pricing and volume adjustments	[1]	(6,756)	5,147
Revenue excluding treatment and refining charges		1,574,275	1,508,405
Treatment and refining charges		(101,909)	(106,066)
Revenue		$ 1,472,366	$ 1,402,339
[1]	Pricing and volume adjustments represent mark-to-market adjustments on initial estimate of provisionally priced sales, realized and unrealized changes to fair value for non-hedge derivative contracts and adjustments to originally invoiced weights and assays.

Disclosure of depreciation and

Disclosure of depreciation and amortization expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Depreciation and amortization	$ 333,144	$ 297,825
Cost Of Sale [Member]
Statements [Line Items]
Depreciation and amortization	332,667	297,470
Selling and administrative expenses [Member]
Statements [Line Items]
Depreciation and amortization	$ 477	$ 355

Disclosure of detailed inform_5

Disclosure of detailed information about share-based payment expenses (recoveries) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Share-based payment expenses (recoveries)	$ (2,373)	$ 15,919
Cost Of Sale [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	160	1,946
Selling and administrative expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	(2,579)	12,649
Other operating expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	46	1,324
Restricted Share Unit [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	(496)	12,937
Restricted Share Unit [Member] | Cost Of Sale [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	160	1,946
Restricted Share Unit [Member] | Selling and administrative expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	(702)	9,667
Restricted Share Unit [Member] | Other operating expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	46	1,324
Deferred Share Unit [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	(1,877)	2,982
Deferred Share Unit [Member] | Cost Of Sale [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	0	0
Deferred Share Unit [Member] | Selling and administrative expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	(1,877)	2,982
Deferred Share Unit [Member] | Other operating expenses [Member]
Statements [Line Items]
Share-based payment expenses (recoveries)	$ 0	$ 0

Disclosure of detailed inform_6

Disclosure of detailed information about employee benefits expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Current employee benefits	$ 176,571	$ 147,760
Profit-sharing plan expense	9,228	19,757
Share-based payments	(2,373)	15,919
Employee share purchase plan	1,533	1,328
Defined benefit plans	12,295	10,132
Defined contribution plans	1,511	2,443
Past service costs	383	10,442
Other post-retirement employee benefits	9,248	7,250
Termination benefits	1,206	419
Employee benefits expense	209,602	215,450
Restricted Share Unit [Member]
Statements [Line Items]
Share-based payments	(496)	12,937
Deferred Share Unit [Member]
Statements [Line Items]
Share-based payments	$ (1,877)	$ 2,982

Disclosure of other operating e

Disclosure of other operating expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Other operating expenses (income)	$ 19,071	$ (12,440)
Regional costs [Member]
Statements [Line Items]
Other operating expenses (income)	4,673	4,308
Pampacancha Delivery Obligation [Member]
Statements [Line Items]
Other operating expenses (income)	7,218	0
Pension Settlement Loss [Member]
Statements [Line Items]
Other operating expenses (income)	2,163	0
Constancia insurance recovery [Member]
Statements [Line Items]
Other operating expenses (income)	0	(12,857)
Realized gain on contingent consideration of Balmat [Member]
Statements [Line Items]
Other operating expenses (income)	0	(6,400)
Loss On Disposals And Other [Member]
Statements [Line Items]
Other operating expenses (income)	$ 5,017	$ 2,509

Disclosure of finance cost (inc

Disclosure of finance cost (income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Finance income	$ (8,450)	$ (2,849)
Interest expense on long-term debt	77,783	87,819
Accretion on financial liabilities at amortized cost	1,244	1,302
Finance costs on deferred revenue	64,921	66,414
Unwinding of discounts on provisions	4,684	4,159
Withholding taxes	9,424	9,641
Other finance expense	7,116	13,256
Gross finance expense	165,172	182,591
Interest capitalized	(13,172)	(13,149)
Total Finance expense	152,000	169,442
Net foreign exchange (gains) losses	(11,067)	15,772
Hudbay warrants	(6,748)	(1,051)
Embedded derivatives	(1,514)	1,790
Investments	3,798	(3,511)
Total other finance (gains) losses	(15,531)	13,000
Net finance expense and other finance losses	$ 128,019	$ 179,593

Disclosure of detailed inform_7

Disclosure of detailed information about impairment loss by segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Statements [Line Items]
Asset impairment loss	$ 11,320
Manitoba [Member]
Statements [Line Items]
Asset impairment loss	11,320
Tax impact - recovery	(3,849)
After-tax impairment charge	$ 7,471

Disclosure of detailed inform_8

Disclosure of detailed information about cash and cash equivalents explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Cash on hand and demand deposits	$ 515,497	$ 356,499	$ 129,850
Short-term money market instruments with maturities of three months or less at acquisition date	0	0	17,014
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864

Disclosure of detailed inform_9

Disclosure of detailed information about trade and other receivables explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Trade receivables	$ 102,112	$ 136,482	$ 97,924
Statutory receivables	12,764	13,961	43,808
Receivable from joint venture partners	245	2,808	0
Other receivables	2,032	2,271	10,835
Total current trade and other receivables	117,153	155,522	152,567
Taxes receivable	17,199	14,394	12,424
Receivable from joint venture partners	20,404	16,414	18,681
Other receivables	1,518	1,651	1,543
Trade and other non-current receivables	39,121	32,459	32,648
Trade and other receivables	$ 156,274	$ 187,981	$ 185,215

Disclosure of detailed infor_10

Disclosure of detailed information about inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Stockpile	$ 5,463	$ 13,468	$ 9,368
Work in progress	1,762	14,552	9,100
Finished goods	62,546	71,906	54,583
Materials and supplies	48,703	41,756	39,413
Current Inventories	118,474	141,682	112,464
Non-current Stockpile	14,730	0	0
Non-current Materials and supplies	4,746	5,809	4,537
Non current Inventories	19,476	5,809	4,537
Total Inventories	$ 137,950	$ 147,491	$ 117,001

Disclosure of other financial a

Disclosure of other financial assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Derivative assets	$ 6,628	$ 2,841	$ 3,397
Current restricted cash	3,738	0	0
Other current financial assets	10,366	2,841	3,397
Investments at fair value through profit or loss	15,159	22,255	13,700
Restricted cash	0	206	17,148
Total other non-current financial assets	15,159	22,461	30,848
Total other financial assets	$ 25,525	$ 25,302	$ 34,245

Disclosure of detailed infor_11

Disclosure of detailed information about intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Balance, beginning of year	$ 5,575	$ 6,614
Balance, end of year	4,162	5,575	$ 6,614
Cost [Member]
Statements [Line Items]
Balance, beginning of year	19,169	16,998	16,179
Additions	590	1,203	407
Effects of movement in exchange rates	(1,202)	968	412
Balance, end of year	18,557	19,169	16,998
Accumulated amortization [Member]
Statements [Line Items]
Balance, beginning of year	13,594	10,384	7,320
Additions	1,793	2,541	2,882
Effects of movement in exchange rates	(992)	669	182
Balance, end of year	$ 14,395	$ 13,594	$ 10,384

Disclosure of detailed infor_12

Disclosure of detailed information about property, plant and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Balance, beginning of year	$ 3,964,233	$ 3,953,752
Decommissioning and restoration	8,998	10,661
Interest capitalised	13,172	13,149
Impairment		(11,320)
Balance, end of year	3,819,812	3,964,233
Cost [Member]
Statements [Line Items]
Balance, beginning of year	5,467,621	5,098,474
Additions	115,559	190,637
Acquisitions	21,654
Capitalized stripping and development	84,023	69,178
Decommissioning and restoration	8,998	10,661
Interest capitalised	13,172	13,149
Transfers and other movements	0	0
Impairment		(11,320)
Disposals	(14,991)	(11,199)
Effects of movement in exchange rates	(133,261)	100,687
Other	(2)	7,354
Balance, end of year	5,562,773	5,467,621
Accumulated depreciation [member]
Statements [Line Items]
Balance, beginning of year	1,503,388	1,144,722
Depreciation for the year	330,572	305,896
Disposals	(6,780)	(7,540)
Effects of movement in exchange rates	(83,680)	60,257
Other	(539)	53
Balance, end of year	1,742,961	1,503,388
Exploration and evaluation assets [Member]
Statements [Line Items]
Balance, beginning of year	23,010
Balance, end of year	52,206	23,010
Exploration and evaluation assets [Member] | Cost [Member]
Statements [Line Items]
Balance, beginning of year	23,010	15,015
Additions	9,950	7,000
Acquisitions	21,654
Capitalized stripping and development	0	0
Decommissioning and restoration	0	0
Interest capitalised	0	0
Transfers and other movements	0	0
Impairment		0
Disposals	(1,208)	0
Effects of movement in exchange rates	(1,197)	995
Other	(3)	0
Balance, end of year	52,206	23,010
Exploration and evaluation assets [Member] | Accumulated depreciation [member]
Statements [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
Capital works in progress [Member]
Statements [Line Items]
Balance, beginning of year	933,531
Balance, end of year	873,781	933,531
Capital works in progress [Member] | Cost [Member]
Statements [Line Items]
Balance, beginning of year	933,531	844,759
Additions	88,920	156,807
Acquisitions	0
Capitalized stripping and development	0	0
Decommissioning and restoration	15	51
Interest capitalised	13,172	13,149
Transfers and other movements	(152,781)	(79,671)
Impairment		(11,320)
Disposals	(4,034)	(13)
Effects of movement in exchange rates	(3,873)	2,955
Other	(1,169)	6,814
Balance, end of year	873,781	933,531
Capital works in progress [Member] | Accumulated depreciation [member]
Statements [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
Mining properties [Member]
Statements [Line Items]
Balance, beginning of year	1,291,878
Balance, end of year	1,217,685	1,291,878
Mining properties [Member] | Cost [Member]
Statements [Line Items]
Balance, beginning of year	1,975,061	1,852,705
Additions	0	0
Acquisitions	0
Capitalized stripping and development	84,023	69,178
Decommissioning and restoration	1,711	5,509
Interest capitalised	0	0
Transfers and other movements	2,132	0
Impairment		0
Disposals	0	(1,600)
Effects of movement in exchange rates	(65,434)	49,184
Other	946	85
Balance, end of year	1,998,439	1,975,061
Mining properties [Member] | Accumulated depreciation [member]
Statements [Line Items]
Balance, beginning of year	683,183	529,242
Depreciation for the year	141,218	122,444
Disposals	0	0
Effects of movement in exchange rates	(43,469)	31,516
Other	(178)	(19)
Balance, end of year	780,754	683,183
Plant and equipment [member]
Statements [Line Items]
Balance, beginning of year	1,715,814
Balance, end of year	1,676,140	1,715,814
Plant and equipment [member] | Cost [Member]
Statements [Line Items]
Balance, beginning of year	2,536,019	2,385,995
Additions	16,689	26,830
Acquisitions	0
Capitalized stripping and development	0	0
Decommissioning and restoration	7,272	5,101
Interest capitalised	0	0
Transfers and other movements	150,649	79,671
Impairment		0
Disposals	(9,749)	(9,586)
Effects of movement in exchange rates	(62,757)	47,553
Other	224	455
Balance, end of year	2,638,347	2,536,019
Plant and equipment [member] | Accumulated depreciation [member]
Statements [Line Items]
Balance, beginning of year	820,205	615,480
Depreciation for the year	189,354	183,452
Disposals	(6,780)	(7,540)
Effects of movement in exchange rates	(40,211)	28,741
Other	(361)	72
Balance, end of year	$ 962,207	$ 820,205

Disclosure of detailed infor_13

Disclosure of detailed information about trade and other payables explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Trade payables	$ 61,395	$ 71,336	$ 80,509
Accruals and payables	68,386	86,078	78,154
Accrued interest	34,662	34,848	4,300
Exploration and evaluation payables	185	186	64
Embedded derivatives - provisional pricing	0	373	86
Statutory payables	7,324	6,296	6,549
Trade and other payables	$ 171,952	$ 199,117	$ 169,662

Disclosure of other current lia

Disclosure of other current liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Provisions	$ 14,276	$ 27,370	$ 14,367
Pension liability	11,854	19,401	24,635
Other employee benefits	2,564	2,756	2,356
Unearned revenue	1,857	2,435	849
Other liabilities	$ 30,551	$ 51,962	$ 42,207

Disclosure of detailed infor_14

Disclosure of detailed information about other financial liabilities explanatory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Derivative liabilities	$ 2,634	$ 16,140	$ 10,682
Warrants at fair value through profit and loss, current	0	6,961	0
Contingent consideration - gold price option, current	0	732	0
Other financial liabilities at amortized cost, current	2,590	2,630	2,813
Embedded derivatives, current	7,201	297	0
Other financial liabilities, current	12,425	26,760	13,495
Contingent consideration - gold price option, non-current	0	0	570
Warrants at fair value through profit and loss, non-current	0	0	7,588
Other financial liabilities at amortized cost, non-current	18,771	19,938	20,185
Embedded derivatives, non-current	0	863	0
Other financial liabilities, non-current	18,771	20,801	28,343
Other financial liabilities	$ 31,196	$ 47,561	$ 41,838

Disclosure of additional inform

Disclosure of additional information about leasing activities for lessee (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Total minimum lease payments	$ 78,174	$ 89,750	$ 13,720
Effect of discounting	(3,939)	(5,177)	(788)
Present value of minimum lease payments	74,235	84,573	12,932
Less: current portion	(20,472)	(18,327)	(3,172)
Minimum finance lease payments payable noncurrent	53,763	66,246	9,760
Less than 12 months [Member]
Statements [Line Items]
Total minimum lease payments	18,448	20,186	3,508
13-36 months [Member]
Statements [Line Items]
Total minimum lease payments	40,615	40,253	6,667
37-60 months [Member]
Statements [Line Items]
Total minimum lease payments	$ 19,111	$ 29,311	$ 3,545

Disclosure of borrowings (Detai

Disclosure of borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Total debt	$ 981,030	$ 979,575	$ 1,232,164
Current portion of long-term debt			16,490
Non-current portion of long-term debt	981,030	979,575	1,215,674
Senior unsecured notes [Member]
Statements [Line Items]
Total debt	989,306	987,903	986,574
Equipment finance facility [Member]
Statements [Line Items]
Total debt	0	0	50,267
Senior secured revolving credit facilities [Member]
Statements [Line Items]
Total debt	0	0	202,075
Unamortized transaction costs - revolving credit facilities [Member]
Statements [Line Items]
Less: Unamortized transaction costs - revolving credit facilities	$ (8,276)	$ (8,328)	$ (6,752)

Disclosure of detailed infor_15

Disclosure of detailed information about borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Borrowings, beginning balance	$ 979,575	$ 1,232,164
Borrowings, ending balance	981,030	979,575
Senior unsecured notes [Member]
Statements [Line Items]
Borrowings, beginning balance	987,903	986,574
Transaction costs		(133)
Change in fair value of embedded derivative (prepayment option)	316	450
Accretion of transaction costs and premiums	1,087	1,012
Borrowings, ending balance	989,306	987,903
Equipment finance facility [Member]
Statements [Line Items]
Borrowings, beginning balance	0	50,267
Transaction costs		(326)
Payments made		(54,364)
Write-down of unamortized transaction costs		3,552
Accretion of transaction costs and premiums		871
Borrowings, ending balance	0	0
Senior secured revolving credit facilities [Member]
Statements [Line Items]
Borrowings, beginning balance	0	202,075
Addition to Principal		25,000
Payments made		(227,075)
Borrowings, ending balance	$ 0	$ 0

Disclosure of detailed infor_16

Disclosure of detailed information about unamortized transaction costs - revolving credit facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equipment finance facility [Member]
Statements [Line Items]
Accretion of transaction costs		$ (871)
New transaction costs		326
Senior unsecured notes [Member]
Statements [Line Items]
Accretion of transaction costs	$ (1,087)	(1,012)
New transaction costs		133
Unamortized transaction costs - revolving credit facilities [Member]
Statements [Line Items]
Unamortized transaction costs, beginning balance	8,328	6,752
Accretion of transaction costs	1,946	3,291
New transaction costs	1,894	4,867
Unamortized transaction costs, ending balance	$ 8,276	$ 8,328

Disclosure of changes in deferr

Disclosure of changes in deferred revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Stream accounting - Deferred revenue, beginning balance	$ 601,930	$ 616,246
Recognition of revenue		(88,744)
Amortization of deferred revenue
Liability drawdown	(96,038)
Variable consideration adjustment	2,656
Finance costs	64,921	66,414
Effects of changes in foreign exchange	(7,391)	8,014
Stream accounting - Deferred revenue, ending balance	$ 566,078	$ 601,930

Disclosure of detailed infor_17

Disclosure of detailed information about deferred revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Current	$ 86,256	$ 107,194	$ 87,411
Non-current	479,822	494,736	528,835
Deferred revenue	$ 566,078	$ 601,930	$ 616,246

Disclosure of changes in provis

Disclosure of changes in provisions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Provisions, beginning balance	$ 227,508	$ 194,069
Net additional provisions made	17,497	14,882
Amounts used	(7,393)	(7,135)
Unwinding of discount	4,684	4,159
Effect of change in discount rate	(462)	2,658
Effect of foreign exchange	(12,587)	11,147
Effect of change in share price	(10,323)	7,728
Provisions, ending balance	218,924	227,508
Decommissioning, restoration and similar liabilities [Member]
Statements [Line Items]
Provisions, beginning balance	200,041	177,296
Net additional provisions made	9,031	6,485
Amounts used	(188)	(69)
Unwinding of discount	4,684	4,159
Effect of change in discount rate	(462)	2,658
Effect of foreign exchange	(11,082)	9,512
Effect of change in share price	0	0
Provisions, ending balance	202,024	200,041
Deferred share units [Member]
Statements [Line Items]
Provisions, beginning balance	6,623	3,933
Net additional provisions made	973	868
Amounts used	0	(638)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	(458)	346
Effect of change in share price	(2,850)	2,114
Provisions, ending balance	4,288	6,623
Restricted share units [Member]
Statements [Line Items]
Provisions, beginning balance	19,409	11,052
Net additional provisions made	7,493	7,327
Amounts used	(6,435)	(5,491)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	(973)	1,194
Effect of change in share price	(7,293)	5,327
Provisions, ending balance	12,201	19,409
Other provisions [Member]
Statements [Line Items]
Provisions, beginning balance	1,435	1,788
Net additional provisions made	0	202
Amounts used	(770)	(937)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	(74)	95
Effect of change in share price	(180)	287
Provisions, ending balance	$ 411	$ 1,435

Disclosure of detailed infor_18

Disclosure of detailed information about provisions (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Current provisions	$ 14,276	$ 27,370	$ 14,367
Non-current provisions	204,648	200,138	179,702
Total provisions	218,924	227,508	194,069
Decommissioning, restoration and similar liabilities [Member]
Statements [Line Items]
Current provisions	1,234	2,344	1,054
Non-current provisions	200,790	197,697	176,242
Total provisions	202,024	200,041	177,296
Deferred share units [Member]
Statements [Line Items]
Current provisions	4,288	6,623	3,933
Non-current provisions	0	0	0
Total provisions	4,288	6,623	3,933
Restricted share units [Member]
Statements [Line Items]
Current provisions	8,412	17,119	8,451
Non-current provisions	3,789	2,290	2,601
Total provisions	12,201	19,409	11,052
Other provisions [Member]
Statements [Line Items]
Current provisions	342	1,284	929
Non-current provisions	69	151	859
Total provisions	$ 411	$ 1,435	$ 1,788

Disclosure of additional info_2

Disclosure of additional information about defined benefit plans (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Opening defined benefit obligation	$ 383,054	$ 349,165
Current service cost	11,032	10,707
Past service cost related to the new collective bargaining agreement	383	10,442
Interest cost	12,009	12,602
Benefits paid from plan	(29,499)	(33,721)
Benefits paid from employer	(1,998)	(999)
Participant contributions	98	93
Effects of movements in exchange rates	(32,015)	24,440
Arising from changes in demographic assumptions	0	1,598
Arising from changes in financial assumptions	(11,585)	9,402
Arising from experience adjustments	(2,112)	(675)
Settlement payments from plan assets	(120,018)	0
Loss on settlement	2,163	0
Closing defined benefit obligation	$ 211,512	$ 383,054

Disclosure of additional info_3

Disclosure of additional information about defined benefit plans, balance by member group (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Closing defined benefit obligation	$ 211,512	$ 383,054	$ 349,165
Active members [Member]
Statements [Line Items]
Closing defined benefit obligation	200,591	250,965	235,815
Deferred members [Member]
Statements [Line Items]
Closing defined benefit obligation	723	4,304	3,636
Retired members [Member]
Statements [Line Items]
Closing defined benefit obligation	$ 10,198	$ 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, 2018	Dec. 31, 2017
Statements [Line Items]
Opening fair value of plan assets	$ 341,432	$ 296,151
Interest income	11,033	11,005
Return on plan assets (excluding amounts included in net interest expense)	(15,296)	24,437
Contributions from the employer	17,020	22,484
Employer direct benefit payments	1,998	999
Contributions from plan participants	98	93
Benefit payment from employer	(1,998)	(999)
Administrative expenses paid from plan assets	(83)	(80)
Benefits paid	(29,499)	(33,721)
Settlement payments from plan assets	(120,018)	0
Effects of changes in foreign exchange rates	(28,892)	21,063
Closing fair value of plan assets	$ 175,795	$ 341,432

Disclosure of net defined benef

Disclosure of net defined benefit liability (asset) (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Present value of funded defined benefit obligation	$ 195,283	$ 365,655	$ 333,720
Fair value of plan assets	(175,795)	(341,432)	(296,151)
Present value of unfunded defined benefit obligation	16,229	17,399	15,445
Net liability arising from defined benefit obligation	$ 35,717	$ 41,622	$ 53,014

Disclosure of detailed infor_19

Disclosure of detailed information about pension obligation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Pension obligation - non-current	$ 23,863	$ 22,221	$ 28,379
Pension obligations [Member]
Statements [Line Items]
Pension obligation - current	11,854	19,401	24,635
Pension obligation - non-current	23,863	22,221	28,379
Net liability	$ 35,717	$ 41,622	$ 53,014

Disclosure of detailed infor_20

Disclosure of detailed information about pension expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Defined benefit pension expense	$ 12,295	$ 10,132
Defined contribution pension expense	1,511	2,443
Pension obligations [Member]
Statements [Line Items]
Current service cost	11,032	10,707
Past service cost and loss from settlements	383	10,442
Loss on settlement	2,163	0
Total service cost	13,578	21,149
Net interest expense	976	1,597
Administration cost	83	80
Defined benefit pension expense	14,637	22,826
Defined contribution pension expense	$ 1,469	$ 908

Disclosure of detailed infor_21

Disclosure of detailed information about remeasurement on the net defined benefit liability (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
(Return)/loss on plan assets (excluding amounts included in net interest expense)	$ 15,296	$ (24,437)
Actuarial gains arising from changes in demographic assumptions	0	1,598
Actuarial losses/(gains) arising from changes in financial assumptions	(11,585)	9,402
Actuarial gains arising from experience adjustments	(2,112)	(675)
Components recognized in statements of comprehensive income	1,599	(14,112)
Total pension cost	$ 17,705	$ 9,622

Disclosure of defined benefit p

Disclosure of defined benefit plan, assumptions used (Details) - Pension obligations [Member] - Year	Dec. 31, 2018	Dec. 31, 2017
Defined benefit cost [Member]
Statements [Line Items]
Expected rate of salary increase	2.75%	2.75%
Defined benefit cost [Member] | Males [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	21	20.9
Defined benefit cost [Member] | Females [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	23.7	23.3
Defined benefit cost [Member] | Benefit obligations [Member]
Statements [Line Items]
Discount rate	3.45%	3.69%
Defined benefit cost [Member] | Service cost [Member]
Statements [Line Items]
Discount rate	3.50%	3.82%
Defined benefit obligation [Member]
Statements [Line Items]
Discount rate	3.73%	3.45%
Expected rate of salary increase	2.75%	2.75%
Defined benefit obligation [Member] | Males [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	21.1	21
Average longevity at retirement age for current employees (future pensioners) (years)	23	22.9
Defined benefit obligation [Member] | Females [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.7
Average longevity at retirement age for current employees (future pensioners) (years)	25.6	25.5

Disclosure of fair value of pla

Disclosure of fair value of plan assets (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Plan assets, at fair value	$ 175,795	$ 341,432	$ 296,151
Level 1 [Member]
Statements [Line Items]
Plan assets, at fair value	56,401	120,652	125,618
Level 2 [Member]
Statements [Line Items]
Plan assets, at fair value	119,394	220,780	170,533
Level 3 [Member]
Statements [Line Items]
Plan assets, at fair value	0	0	0
Money market instruments [Member]
Statements [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	3,072	4,625	4,515
Money market instruments [Member] | Level 1 [Member]
Statements [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	3,072	4,625	4,515
Money market instruments [Member] | Level 2 [Member]
Statements [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0	0
Money market instruments [Member] | Level 3 [Member]
Statements [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0	0
Pooled equity funds [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	53,329	116,027	121,103
Pooled equity funds [Member] | Level 1 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	53,329	116,027	121,103
Pooled equity funds [Member] | Level 2 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Pooled equity funds [Member] | Level 3 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Pooled fixed income funds [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	91,854	189,964	143,489
Pooled fixed income funds [Member] | Level 1 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Pooled fixed income funds [Member] | Level 2 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	91,854	189,964	143,489
Pooled fixed income funds [Member] | Level 3 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Alternative investment funds [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	26,871	30,699	26,404
Alternative investment funds [Member] | Level 1 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Alternative investment funds [Member] | Level 2 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	26,871	30,699	26,404
Alternative investment funds [Member] | Level 3 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Balanced Fund Member
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	669	117	640
Balanced Fund Member | Level 1 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0	0
Balanced Fund Member | Level 2 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	669	117	640
Balanced Fund Member | Level 3 [Member]
Statements [Line Items]
Investment funds, amount contributed to fair value of plan assets	$ 0	$ 0	$ 0

Disclosure of additional info_4

Disclosure of additional information about other employee benefit plans (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statements [Line Items]
Opening defined benefit obligation	$ 107,829	$ 89,005
Current service cost	3,455	2,614
Past service cost	255	0
Interest cost	3,683	3,567
Effects of movements in exchange rates	(8,587)	7,026
Arising from changes in demographic assumptions	(9,996)	1,172
Arising from changes in financial assumptions	2,809	6,761
Arising from experience adjustments	(3,472)	(120)
Benefits paid	(2,448)	(2,196)	$ (1,949)
Closing defined benefit obligation	$ 93,528	$ 107,829

Disclosure of additional info_5

Disclosure of additional information about other employee benefit plans, balance by member group (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Closing defined benefit obligation	$ 93,528	$ 107,829	$ 89,005
Inactive members [Member]
Statements [Line Items]
Closing defined benefit obligation	46,279	43,369	36,394
Active members [Member]
Statements [Line Items]
Closing defined benefit obligation	$ 47,249	$ 64,460	$ 52,611

Disclosure of changes in fair_2

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Statements [Line Items]
Employer contributions	$ 2,448	$ 2,196	$ 1,949
Benefits paid	(2,448)	(2,196)	(1,949)
Plan assets, at fair value	$ 0	$ 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, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Unfunded benefit obligation	$ 93,528	$ 107,829	$ 89,005
Vacation accrual and other - non-current	2,664	3,324	2,624
Net liability	$ 96,192	$ 111,153	$ 91,629

Disclosure of detailed infor_22

Disclosure of detailed information about other employee benefits plan (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Other employee benefits liability - current	$ 2,564	$ 2,756	$ 2,356
Other employee benefits liability - non-current	93,628	108,397	89,273
Net liability	$ 96,192	$ 111,153	$ 91,629

Disclosure of detailed infor_23

Disclosure of detailed information about employee future benefit expense (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Current service cost	$ 3,710	$ 2,614
Net interest expense	3,683	3,567
Components recognized in income statements	$ 7,393	$ 6,181

Disclosure of detailed infor_24

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, 2018	Dec. 31, 2017
Statements [Line Items]
Actuarial (gains)/losses arising from changes in demographic assumptions	$ (9,996)	$ 1,172
Actuarial (gains)/losses arising from changes in financial assumptions	2,809	6,761
Actuarial gains arising from experience adjustments	(3,472)	(120)
Components recognized in statements of comprehensive income	(10,659)	7,813
Total other employee future benefit cost	$ (3,266)	$ 13,994

Disclosure of other employee be

Disclosure of other employee benefit plan, assumptions used (Details) - Other employee benefits [Member] - Year	Dec. 31, 2018	Dec. 31, 2017
Defined benefit cost [Member]
Statements [Line Items]
Discount rate	3.64%	4.03%
Defined benefit cost [Member] | Initial [Member]
Statements [Line Items]
Weighted average health care trend rate	5.97%	6.13%
Defined benefit cost [Member] | Ultimate [Member]
Statements [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit cost [Member] | Males [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	21	21.6
Defined benefit cost [Member] | Females [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	23.7	24.1
Defined benefit obligation [Member]
Statements [Line Items]
Discount rate	3.88%	3.64%
Defined benefit obligation [Member] | Initial [Member]
Statements [Line Items]
Weighted average health care trend rate	5.74%	5.97%
Defined benefit obligation [Member] | Ultimate [Member]
Statements [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit obligation [Member] | Males [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	21.1	21
Average longevity at retirement age for current employees (future pensioners) (years)	23	22.9
Defined benefit obligation [Member] | Females [Member]
Statements [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.7
Average longevity at retirement age for current employees (future pensioners) (years)	25.6	25.5

Disclosure of detailed infor_25

Disclosure of detailed information about effective income tax expense recovery (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Current income tax expense (Canada)	$ 5,251	$ 6,077
Current income tax expense (Peru)	19,103	24,523
Current Mining Taxes (Canada)	9,085	5,085
Current Mining Taxes (Peru)	11,030	14,706
Adjustments in respect of prior years	707	(448)
Current tax expense (income) and adjustments for current tax of prior periods	45,176	49,943
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Canada)	25,811	2,067
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Peru)	10,780	29,727
Income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (United States)	3,170	(46,908)
Deferred Canadian mining tax expense (income) relating to origination and reversal of temporary differences	414	467
Deferred Peruvian mining tax expense (income) relating to origination and reversal of temporary differences	(621)	(661)
Adjustments in respect of prior years	691	(1,416)
Deferred tax expense (income)	40,245	(16,724)
Tax expense (recovery)	$ 85,421	$ 33,219

Disclosure of deferred taxes (D

Disclosure of deferred taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Deferred income tax asset	$ 15,513	$ 31,937	$ 40,162
Deferred income tax liability	(324,090)	(309,403)	(328,263)
Net deferred tax liability balance	(308,577)	(277,466)	(288,101)
Income tax effect of temporary differences [Member]
Statements [Line Items]
Deferred income tax asset	15,513	31,937	40,162
Deferred income tax liability	(307,313)	(291,665)	(310,772)
Net deferred tax liability balance	(291,800)	(259,728)	(270,610)
Income tax effect of temporary differences [Member] | Canada [Member]
Statements [Line Items]
Deferred income tax asset	15,513	31,937	40,162
Income tax effect of temporary differences [Member] | Peru [Member]
Statements [Line Items]
Deferred income tax liability	(196,452)	(183,973)	(203,081)
Income tax effect of temporary differences [Member] | United States [Member]
Statements [Line Items]
Deferred income tax liability	(110,861)	(107,692)	(107,691)
Mining tax effect of temporary differences recognized [Member] | Canada [Member]
Statements [Line Items]
Deferred income tax liability	(5,119)	(5,614)	(4,706)
Net deferred tax liability balance	(5,119)	(5,614)	(4,706)
Mining tax effect of temporary differences recognized [Member] | Peru [Member]
Statements [Line Items]
Deferred income tax liability	(11,658)	(12,124)	(12,785)
Net deferred tax liability balance	$ (11,658)	$ (12,124)	$ (12,785)

Disclosure of changes in defe_2

Disclosure of changes in deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Net deferred tax liability balance, beginning of period	$ (277,466)	$ (288,101)
Deferred income tax recovery (expense)	(40,245)	16,724
OCI transactions	520	(3,845)
Items charged directly to equity	0	2,238
Foreign currency translation on the deferred tax liability	8,614	(4,482)
Net deferred tax liability balance, end of year	$ (308,577)	$ (277,466)

Disclosure of reconciliation to

Disclosure of reconciliation to statutory tax rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Statutory tax rate	27.00%	27.00%
Tax expense at statutory rate	$ 46,126	$ 46,685
Effect of Deductions related to mining taxes	(5,976)	(6,075)
Adjusted income taxes	40,150	40,610
Mining tax expense (recovery)	19,214	19,367
Adjusted income tax expense after mining tax expense (recovery)	59,364	59,977
Permanent differences related to capital items	(2,903)	1,462
Permanent differences related to other income tax permanent differences	(454)	338
Impact of remeasurement on decommissioning liability	3,898	15,290
Temporary income tax differences not recognized	4,449	15,376
Impact related to differences in tax rates in foreign operations	9,594	4,605
Impact of changes to statutory tax rate	45	(52,855)
Foreign exchange on non-monetary items	11,408	(9,387)
Impact related to tax assessments and tax return amendments	20	(1,587)
Tax expense (recovery)	$ 85,421	$ 33,219

Disclosure of temporary differe

Disclosure of temporary differences recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Deferred income tax asset	$ 15,513	$ 31,937	$ 40,162
Deferred income tax liability	324,090	309,403	328,263
Deferred income tax (liability) asset	(308,577)	(277,466)	(288,101)
Property, plant and equipment [Member]
Statements [Line Items]
Deferred income tax asset	(83,407)	(102,053)	(71,837)
Deferred income tax (recovery) expense	(18,646)	30,216
Deferred income tax liability	339,037	320,036	389,502
Deferred income tax expense (recovery)	25,456	(69,466)
Pension obligation [Member]
Statements [Line Items]
Deferred income tax asset	7,817	10,034	13,092
Deferred income tax (recovery) expense	2,739	(787)
Deferred income tax liability	0	0	(12,150)
Deferred income tax expense (recovery)	0	12,150
Other employee benefits [Member]
Statements [Line Items]
Deferred income tax asset	13,488	16,742	17,778
Deferred income tax (recovery) expense	3,254	1,036
Deferred income tax liability	240	192	(14,806)
Deferred income tax expense (recovery)	48	14,998
Asset retirement obligations [Member]
Statements [Line Items]
Deferred income tax liability	(918)	(789)	(11,357)
Deferred income tax expense (recovery)	(129)	10,568
Non-capital losses [Member]
Statements [Line Items]
Deferred income tax asset	72,470	91,495	59,034
Deferred income tax (recovery) expense	19,025	(32,461)
Deferred income tax liability	(27,374)	(27,539)	(46,500)
Deferred income tax expense (recovery)	165	18,961
Share issue and debt costs [Member]
Statements [Line Items]
Deferred income tax asset	10,896	15,707	16,319
Deferred income tax (recovery) expense	4,807	2,850
Other [Member]
Statements [Line Items]
Deferred income tax asset	(5,751)	12	5,776
Deferred income tax (recovery) expense	7,681	1,657
Deferred income tax liability	(3,672)	(235)	6,083
Deferred income tax expense (recovery)	(3,439)	(6,318)
Income tax effect of temporary differences [Member]
Statements [Line Items]
Deferred income tax asset	15,513	31,937	40,162
Deferred income tax (recovery) expense	18,860	2,511
Deferred income tax liability	307,313	291,665	310,772
Deferred income tax expense (recovery)	22,101	(19,107)
Deferred income tax (liability) asset	(291,800)	(259,728)	$ (270,610)
Net deferred income tax expense (recovery)	$ 40,961	$ (16,596)

Disclosure of temporary diffe_2

Disclosure of temporary differences not recognized (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Temporary differences not recognized	$ 569,254	$ 613,495
Property, plant and equipment [Member]
Statements [Line Items]
Temporary differences not recognized	0	32,089
Capital losses [Member]
Statements [Line Items]
Temporary differences not recognized	200,455	223,916
Other employee benefits [Member]
Statements [Line Items]
Temporary differences not recognized	77,166	78,871
Asset retirement obligations [Member]
Statements [Line Items]
Temporary differences not recognized	175,091	174,448
Non-capital losses [Member]
Statements [Line Items]
Temporary differences not recognized	$ 116,542	$ 104,171

Disclosure of temporary diffe_3

Disclosure of temporary differences - deferred mining tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Net deferred tax asset (liability)	$ (308,577)	$ (277,466)	$ (288,101)
Mining tax effect of temporary differences recognized [Member] | Canada [Member]
Statements [Line Items]
Net deferred tax asset (liability)	(5,119)	(5,614)	(4,706)
Mining tax effect of temporary differences recognized [Member] | Peru [Member]
Statements [Line Items]
Net deferred tax asset (liability)	$ (11,658)	$ (12,124)	$ (12,785)

Disclosure of detailed infor_26

Disclosure of detailed information about shares, activity explanatory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Beginning Balance	$ 2,112,345	$ 1,760,079
Equity issuance		195,295
Share issue costs, net of tax	(80)	(6,205)
Warrants exercised	11
Ending Balance	$ 2,178,856	$ 2,112,345
Share capital [Member]
Statements [Line Items]
Number of shares issued and fully paid, beginning balance	261,271,188	237,271,188
Beginning Balance	$ 1,777,409	$ 1,588,319
Equity issuance (in shares)	0	24,000,000
Equity issuance	$ 0	$ 195,295
Share issue costs, net of tax (in shares)	0	0
Share issue costs, net of tax	$ (80)	$ (6,205)
Warrants exercised (in share)	963	0
Warrants exercised	$ 11	$ 0
Number of shares issued and fully paid, ending balance	261,272,151	261,271,188
Ending Balance	$ 1,777,340	$ 1,777,409

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, 2018USD ($)Share	Dec. 31, 2018CAD ($)Share	Dec. 31, 2017USD ($)Share	Dec. 31, 2017CAD ($)Share
Deferred Share Unit [Member]
Statements [Line Items]
Number of units granted during the year	158,886	158,886	130,964	130,964
Weighted average price (C$/unit) | $		$ 7.91		$ 8.59
Expenses (recovery) recognized during the year related to the grant of deferred share units, as well as mark-to-market adjustments | $	$ (1,877)		$ 2,982
Payments made during the year | $	$ 0		$ 638
Restricted Share Unit [Member]
Statements [Line Items]
Number of restricted share units, beginning of year	3,405,713	3,405,713	3,492,408	3,492,408
Number of units granted during the year	1,031,701	1,031,701	987,194	987,194
Credits for dividends	9,724	9,724	8,156	8,156
Number of units forfeited during the year	(21,190)	(21,190)	(201,946)	(201,946)
Number of units vested	(759,081)	(759,081)	(880,099)	(880,099)
Number of restricted share units, end of year	3,666,867	3,666,867	3,405,713	3,405,713
Weighted average price (C$/unit) | $		$ 10.33		$ 10.60
Expenses (recovery) recognized during the year related to the grant of deferred share units, as well as mark-to-market adjustments | $	$ (496)		$ 12,937
Payments made during the year | $	$ 6,435		$ 5,491

Disclosure of number and weig_2

Disclosure of number and weighted average exercise prices of share options (Details)	12 Months Ended
	Dec. 31, 2018CAD ($)Share	Dec. 31, 2017CAD ($)Share
Statements [Line Items]
Number of shares subject to option, beginning of year | Share	523,352	1,470,377
Weighted average exercise price of share options outstanding in share-based payment arrangement, beginning of year | $	$ 15.86	$ 19.24
Number of shares subject to option, forfeited | Share	0	(20,002)
Weighted average exercise price of options forfeited | $	$ 0	$ 15.86
Number of shares subject to option, expired | Share	(523,352)	(927,023)
Weighted average exercise price of options expired | $	$ 15.86	$ 21.22
Number of shares subject to option, end of year | Share	0	523,352
Weighted average exercise price of share options outstanding in share-based payment arrangement, end of year | $	$ 0	$ 15.86

Disclosure of range of exercise

Disclosure of range of exercise prices of outstanding share options (Details)	Dec. 31, 2018CAD ($)Share	Dec. 31, 2017CAD ($)YearShare	Jan. 01, 2017CAD ($)Share
Statements [Line Items]
Exercise price of options		$ 15.86
Number of options outstanding | Share	0	523,352	1,470,377
Weighted average remaining contractual life (years) | Year		0.2
Weighted average exercise price (options outstanding)	$ 0	$ 15.86	$ 19.24
Number of options exercisable | Share		523,352
Weighted average exercise price (options exercisable)		$ 15.86

Earnings per share (Details)

Earnings per share (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Basic and diluted weighted average common shares outstanding	261,271,621	243,500,696

Disclosure of fair value measur

Disclosure of fair value measurement (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864
Non-hedge derivative assets	6,628	2,841	3,397
Prepayment option - embedded derivative	3,664	3,980	4,430
Investments at FVTPL	15,159	22,255	13,700
Other financial liabilities	31,196	47,561	41,838
Embedded derivatives	7,201	1,533	86
Warrant liabilities	0	6,961	7,588
Option liabilities	0	732	570
Non-hedge derivative liabilities	2,634	16,140	10,682
Fair value [Member]
Statements [Line Items]
Cash and cash equivalents	515,497	356,499	146,864
Restricted cash	3,738	206	17,148
Trade and other receivables	126,311	159,626	128,983
Non-hedge derivative assets	6,628	2,841	3,397
Prepayment option - embedded derivative	3,664	3,980	4,430
Investments at FVTPL	15,159	22,255	13,700
Total financial assets	670,997	545,407	314,522
Trade and other payables	164,628	192,448	163,027
Finance leases	74,235	84,573	12,932
Other financial liabilities	17,425	19,625	17,231
Senior unsecured notes	988,294	1,082,740	1,040,178
Equipment finance facility	0	0	50,267
Senior secured revolving credit facilities	0	0	202,075
Unamortized transaction costs	(8,276)	(8,328)	(6,752)
Embedded derivatives	7,201	1,533	86
Warrant liabilities	0	6,961	7,588
Option liabilities	0	732	570
Non-hedge derivative liabilities	2,634	16,140	10,682
Total financial liabilities	1,246,141	1,396,424	1,497,884
Net financial assets (liabilities)	(575,144)	(851,017)	(1,183,362)
Carrying Amounts [Member]
Statements [Line Items]
Cash and cash equivalents	515,497	356,499	146,864
Restricted cash	3,738	206	17,148
Trade and other receivables	126,311	159,626	128,983
Non-hedge derivative assets	6,628	2,841	3,397
Prepayment option - embedded derivative	3,664	3,980	4,430
Investments at FVTPL	15,159	22,255	13,700
Total financial assets	670,997	545,407	314,522
Trade and other payables	164,628	192,448	163,027
Finance leases	74,235	84,573	12,932
Other financial liabilities	21,361	22,568	22,998
Senior unsecured notes	992,970	991,883	991,004
Equipment finance facility	0	0	50,267
Senior secured revolving credit facilities	0	0	202,075
Unamortized transaction costs	(8,276)	(8,328)	(6,752)
Embedded derivatives	7,201	1,533	86
Warrant liabilities	0	6,961	7,588
Option liabilities	0	732	570
Non-hedge derivative liabilities	2,634	16,140	10,682
Total financial liabilities	1,254,753	1,308,510	1,454,477
Net financial assets (liabilities)	$ (583,756)	$ (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, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Non-hedge derivatives	$ 6,628	$ 2,841	$ 3,397
Investments at FVTPL	15,159	22,255	13,700
Prepayment option embedded derivative	3,664	3,980	4,430
Financial assets measured at fair value	25,451	29,076	21,527
Embedded derivatives	7,201	1,533	86
Non-hedge derivatives	2,634	16,140	10,682
Option liability	0	732	570
Warrant liabilities	0	6,961	7,588
Financial liabilities measured at fair value	9,835	25,366	18,926
Level 1 [Member]
Statements [Line Items]
Non-hedge derivatives	0	0	0
Investments at FVTPL	15,159	21,973	12,018
Prepayment option embedded derivative	0	0	0
Financial assets measured at fair value	15,159	21,973	12,018
Embedded derivatives	0	0	0
Non-hedge derivatives	0	0	0
Option liability	0	0	0
Warrant liabilities	0	6,961	7,588
Financial liabilities measured at fair value	0	6,961	7,588
Level 2 [Member]
Statements [Line Items]
Non-hedge derivatives	6,628	2,841	3,397
Investments at FVTPL	0	282	192
Prepayment option embedded derivative	3,664	3,980	4,430
Financial assets measured at fair value	10,292	7,103	8,019
Embedded derivatives	7,201	1,533	86
Non-hedge derivatives	2,634	16,140	10,682
Option liability	0	732	570
Warrant liabilities	0	0	0
Financial liabilities measured at fair value	9,835	18,405	11,338
Level 3 [Member]
Statements [Line Items]
Non-hedge derivatives	0	0	0
Investments at FVTPL	0	0	1,490
Prepayment option embedded derivative	0	0	0
Financial assets measured at fair value	0	0	1,490
Embedded derivatives	0	0	0
Non-hedge derivatives	0	0	0
Option liability	0	0	0
Warrant liabilities	0	0	0
Financial liabilities measured at fair value	$ 0	$ 0	$ 0

Disclosure of detailed infor_27

Disclosure of detailed information about foreign currency risk (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864
Other financial assets	25,525	25,302	34,245
Other financial liabilities	(31,196)	(47,561)	$ (41,838)
Currency risk [Member] | Amounts Held In CAD [Member]
Statements [Line Items]
Cash and cash equivalents	11,498	9,518
Trade and other receivables	711	530
Other financial assets	15,159	22,255
Trade and other payables	(5,341)	(6,115)
Other financial liabilities	0	(6,961)
Net financial assets (liabilities)	22,027	19,227
Currency risk [Member] | Amounts Held In USD [Member]
Statements [Line Items]
Cash and cash equivalents	29,740	20,597
Trade and other receivables	42,056	77,824
Other financial assets	0	0
Trade and other payables	(3,133)	(9,687)
Other financial liabilities	0	0
Net financial assets (liabilities)	68,663	88,734
Currency risk [Member] | Amounts Held In PEN [Member]
Statements [Line Items]
Cash and cash equivalents	13,934	3,692
Trade and other receivables	1,272	1,114
Other financial assets	0	0
Trade and other payables	(19,513)	(17,917)
Other financial liabilities	(21,361)	(22,568)
Net financial assets (liabilities)	$ (25,668)	$ (35,679)

Disclosure of foreign currency

Disclosure of foreign currency risk (Details) - Currency risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
USD / CAD exchange rate [Member]
Statements [Line Items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 5	$ 3.6
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(6)	(4.4)
Effect of variance decrease on other comprehensive income	$ 0	$ 0
USD / PEN exchange rate [Member]
Statements [Line Items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 1.5	$ 2.1
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(1.8)	(2.6)
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] $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)$ / lb	Dec. 31, 2017USD ($)$ / lb
Copper prices [Member]
Statements [Line Items]
Sensitivity analysis, variance, price | $ / lb	0.30	0.30
Effect of variance increase on after-tax profit	$ (3.1)	$ (2.3)
Effect of variance decrease on after-tax profit	$ 3.1	$ 2.3
Zinc prices [Member]
Statements [Line Items]
Sensitivity analysis, variance, price | $ / lb	0.10	0.10
Effect of variance increase on after-tax profit	$ 0.5	$ 0.9
Effect of variance decrease on after-tax profit	$ (0.5)	$ (0.9)

Disclosure of share price risk

Disclosure of share price risk explanatory (Details) - Share price risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Sensitivity analysis, variance, percentage	25.00%	25.00%
Effect of variance increase on after-tax profit	$ 3.8	$ 5
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	(3.8)	(5)
Effect of variance decrease on other comprehensive income	$ 0	$ 0

Disclosure of interest rate ris

Disclosure of interest rate risk (Details) - Interest rate risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Sensitivity analysis, variance, percentage	2.00%	2.00%
Effect of variance increase on after-tax profit	$ (3.3)	$ 0.4
Effect of variance increase on other comprehensive income	0	0
Effect of variance decrease on after-tax profit	3.2	(2.8)
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, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Cash and cash equivalents	$ 515,497	$ 356,499	$ 146,864
Non-hedge derivative assets	6,628	2,841	3,397
Other financial liabilities	(31,196)	(47,561)	(41,838)
Long-term debt, including embedded derivative	(981,030)	(979,575)	(1,232,164)
Warrant liabilities	0	(6,961)	(7,588)
Derivative financial liabilities	(2,634)	(16,140)	$ (10,682)
12 months or less
Statements [Line Items]
Cash and cash equivalents	515,497	356,499
Trade and other receivables	112,258	124,134
Non-hedge derivative assets	6,628	2,841
Assets used to manage liquidity risk	634,383	483,474
Trade and other payables, including embedded derivative	(164,628)	(192,821)
Other financial liabilities	(3,719)	(3,824)
Long-term debt, including embedded derivative	(79,263)	(79,715)
Finance lease liabilities	(18,448)	(20,186)
Non-derivative financial liabilities	(266,058)	(296,546)
Warrant liabilities		(6,961)
Gold option		(732)
Non-hedge derivative contracts	(2,634)	(15,263)
Derivative financial liabilities	(2,634)	(22,956)
13-36 months [Member]
Statements [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables	11,440	12,403
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	11,440	12,403
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(4,757)	(4,791)
Long-term debt, including embedded derivative	(156,933)	(159,430)
Finance lease liabilities	(40,615)	(40,253)
Non-derivative financial liabilities	(202,305)	(204,474)
Warrant liabilities		0
Gold option		0
Non-hedge derivative contracts	0	(877)
Derivative financial liabilities	0	(877)
37-60 months
Statements [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables	13,215	10,659
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	13,215	10,659
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(3,068)	(4,780)
Long-term debt, including embedded derivative	(535,000)	(152,396)
Finance lease liabilities	(19,111)	(29,311)
Non-derivative financial liabilities	(557,179)	(186,487)
Warrant liabilities		0
Gold option		0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
More than 60 months [Member]
Statements [Line Items]
Cash and cash equivalents	0	0
Trade and other receivables		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	(20,310)	(23,821)
Long-term debt, including embedded derivative	(668,625)	(1,128,875)
Finance lease liabilities	0	0
Non-derivative financial liabilities	(688,935)	(1,152,696)
Warrant liabilities		0
Gold option		0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
Carrying amount [Member]
Statements [Line Items]
Cash and cash equivalents	515,497	356,499
Trade and other receivables	126,311	159,626
Non-hedge derivative assets	6,628	2,841
Assets used to manage liquidity risk	648,436	518,966
Trade and other payables, including embedded derivative	(164,628)	(192,821)
Other financial liabilities	(21,361)	(22,568)
Long-term debt, including embedded derivative	(981,030)	(979,575)
Finance lease liabilities	(74,235)	(84,573)
Non-derivative financial liabilities	(1,241,254)	(1,279,537)
Warrant liabilities		(6,961)
Gold option		(732)
Non-hedge derivative contracts	(2,634)	(16,140)
Derivative financial liabilities	(2,634)	(23,833)
Contractual cash flows [Member]
Statements [Line Items]
Cash and cash equivalents	515,497	356,499
Trade and other receivables	136,913	147,196
Non-hedge derivative assets	6,628	2,841
Assets used to manage liquidity risk	659,038	506,536
Trade and other payables, including embedded derivative	(164,628)	(192,821)
Other financial liabilities	(31,854)	(37,216)
Long-term debt, including embedded derivative	(1,439,821)	(1,520,416)
Finance lease liabilities	(78,174)	(89,750)
Non-derivative financial liabilities	(1,714,477)	(1,840,203)
Warrant liabilities		(6,961)
Gold option		(732)
Non-hedge derivative contracts	(2,634)	(16,140)
Derivative financial liabilities	$ (2,634)	$ (23,833)

Disclosure of maturity analysis

Disclosure of maturity analysis of operating lease payments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 63,448	$ 19,754
Within one year [Member]
Statements [Line Items]
Minimum lease payments payable under non-cancellable operating lease	42,019	5,682
After one year but not more than five years [Member]
Statements [Line Items]
Minimum lease payments payable under non-cancellable operating lease	19,374	12,291
More than five years [Member]
Statements [Line Items]
Minimum lease payments payable under non-cancellable operating lease	$ 2,055	$ 1,781

Disclosure of subsidiaries (Det

Disclosure of subsidiaries (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
HudBay Marketing & Sales Inc. [Member]
Statements [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru Inc. [Member]
Statements [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru S.A.C. [Member]
Statements [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay (BVI) Inc. [Member]
Statements [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
Hudbay Arizona Inc. [Member]
Statements [Line Items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
Rosemont Copper Company [Member]
Statements [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, 2018	Dec. 31, 2017
Statements [Line Items]
Short-term employee benefits	$ 8,652	$ 8,654
Post-employment benefits	762	777
Long-term share-based awards	5,970	6,110
Total key management personnel compensation	$ 15,384	$ 15,541

Disclosure of detailed infor_28

Disclosure of detailed information about supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Trade and other receivables	$ 16,198	$ (8,979)
Other financial assets/liabilities	(17,290)	6,620
Inventories	(32)	(18,690)
Prepaid expenses	(38)	(4,619)
Trade and other payables	(19,608)	(6,336)
Change in taxes payable/receivable, net	7,881	39,326
Provisions and other liabilities	(1,030)	1,693
Increase (decrease) in working capital	$ (13,919)	$ 9,015

Disclosure of geographical area

Disclosure of geographical areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Revenue from external customers	$ 1,472,366	$ 1,402,339
Cost of sales
Mine operating costs	765,959	695,728
Depreciation and amortization	332,667	297,470
Gross profit	373,740	409,141
Selling and administrative expenses	27,243	42,283
Exploration and evaluation	28,570	15,474
Other operating expense (income)	19,071	(12,440)
Asset impairment		11,320
Results from operating activities	298,856	352,504
Finance income	(8,450)	(2,849)
Finance expenses	152,000	169,442
Other finance (gain) losses	(15,531)	13,000
Profit before tax	170,837	172,911
Tax expense	85,421	33,219
Profit for the year	85,416	139,692
Manitoba [Member]
Statements [Line Items]
Revenue from external customers	667,322	712,244
Cost of sales
Mine operating costs	412,760	392,863
Depreciation and amortization	121,515	118,770
Gross profit	133,047	200,611
Selling and administrative expenses	0	0
Exploration and evaluation	12,302	5,649
Other operating expense (income)	5,433	(56)
Asset impairment		11,320
Results from operating activities	115,312	183,698
Peru [Member]
Statements [Line Items]
Revenue from external customers	805,044	690,095
Cost of sales
Mine operating costs	353,199	302,865
Depreciation and amortization	211,152	178,700
Gross profit	240,693	208,530
Selling and administrative expenses	0	0
Exploration and evaluation	5,640	1,442
Other operating expense (income)	11,739	(6,612)
Asset impairment		0
Results from operating activities	223,314	213,700
Arizona [Member]
Statements [Line Items]
Revenue from external customers	0	0
Cost of sales
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross profit	0	0
Selling and administrative expenses	0	0
Exploration and evaluation	0	0
Other operating expense (income)	539	517
Asset impairment		0
Results from operating activities	(539)	(517)
Corporate and other activities [Member]
Statements [Line Items]
Revenue from external customers	0	0
Cost of sales
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross profit	0	0
Selling and administrative expenses	27,243	42,283
Exploration and evaluation	10,628	8,383
Other operating expense (income)	1,360	(6,289)
Asset impairment		0
Results from operating activities	$ (39,231)	$ (44,377)

Disclosure of geographical ar_2

Disclosure of geographical areas, assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Statements [Line Items]
Total assets	$ 4,685,635	$ 4,728,016	$ 4,505,164
Total liabilities	2,506,779	2,615,671	2,745,085
Property, plant and equipment	3,819,812	3,964,233	3,953,752
Manitoba [Member]
Statements [Line Items]
Total assets	621,253	738,967	730,240
Total liabilities	424,576	510,506	475,644
Property, plant and equipment	572,947	619,476	606,348
Peru [Member]
Statements [Line Items]
Total assets	2,751,525	2,750,114	2,808,370
Total liabilities	921,773	932,423	980,479
Property, plant and equipment	2,353,229	2,503,900	2,540,846
Arizona [Member]
Statements [Line Items]
Total assets	896,693	856,589	822,498
Total liabilities	115,470	110,945	158,236
Property, plant and equipment	868,921	836,759	800,542
Corporate and other activities [Member]
Statements [Line Items]
Total assets	416,164	382,346	144,056
Total liabilities	1,044,960	1,061,797	1,130,726
Property, plant and equipment	$ 24,715	$ 4,098	$ 6,016

Disclosure of geographical ar_3

Disclosure of geographical areas, additions to property, plant and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Additions to property, plant and equipment	$ 199,582	$ 259,815
Manitoba [Member]
Statements [Line Items]
Additions to property, plant and equipment	123,896	97,936
Peru [Member]
Statements [Line Items]
Additions to property, plant and equipment	55,818	143,372
Arizona [Member]
Statements [Line Items]
Additions to property, plant and equipment	19,846	18,507
Corporate and other activities [Member]
Statements [Line Items]
Additions to property, plant and equipment	$ 22	$ 0

Disclosure of geographical ar_4

Disclosure of geographical areas, revenue by customer location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements [Line Items]
Revenue from external customers	$ 1,472,366	$ 1,402,339
Canada [Member]
Statements [Line Items]
Revenue from external customers	553,411	461,033
United States [Member]
Statements [Line Items]
Revenue from external customers	211,681	159,085
Switzerland [Member]
Statements [Line Items]
Revenue from external customers	253,165	236,467
Germany [Member]
Statements [Line Items]
Revenue from external customers	52,530	144,684
China [Member]
Statements [Line Items]
Revenue from external customers	140,440	145,935
Peru [Member]
Statements [Line Items]
Revenue from external customers	65,721	101,033
Philippines [Member]
Statements [Line Items]
Revenue from external customers	84,687	120,199
United Kingdom [Member]
Statements [Line Items]
Revenue from external customers	68,346	0
Other [Member]
Statements [Line Items]
Revenue from external customers	$ 42,385	$ 33,903