Wheaton Precious Metals (WPM) 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]
Document Type	40-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	WPM
Entity Registrant Name	WHEATON PRECIOUS METALS CORP.
Entity Central Index Key	0001323404
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding	444,336,361

Consolidated Statements of Earn

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Profit or loss [abstract]
Sales		$ 794,012	$ 843,215
Cost of sales
Cost of sales, excluding depletion		245,794	243,801
Depletion		252,287	262,380
Total cost of sales		498,081	506,181
Gross margin		295,931	337,034
General and administrative	[1]	51,650	34,673
Impairment charges			228,680
Earnings from operations		244,281	73,681
Gain on disposal of mineral stream interest		(245,715)
Other (income) expense		5,826	(13,535)
Earnings before finance costs and income taxes		484,170	87,216
Finance costs		41,187	30,399
Earnings before income taxes		442,983	56,817
Income tax (expense) recovery		(15,868)	886
Net earnings		$ 427,115	$ 57,703
Basic earnings per share		$ 0.96	$ 0.13
Diluted earnings per share		$ 0.96	$ 0.13
Weighted average number of shares outstanding
Basic		443,407	441,961
Diluted		443,862	442,442
[1]	Equity settled stock based compensation (a non-cash item) included in general and administrative expenses $ 5,432 $ 5,051

Consolidated Statements of Ea_2

Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement [LineItems]
Equity settled stock based compensation (a non-cash item) included in general and administrative expenses	$ 5,432	$ 5,051
General and administrative expenses [member]
Statement [LineItems]
Equity settled stock based compensation (a non-cash item) included in general and administrative expenses	$ 5,432	$ 5,051

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Statement of comprehensive income [abstract]
Net earnings		$ 427,115	$ 57,703
Items that will not be reclassified to net earnings
(Loss) gain on LTIs	[1]	(39,985)	18,552
Income tax recovery (expense) related to LTIs	[1]	(2,662)	(1,091)
Total other comprehensive (loss) income	[2]	(42,647)	17,461
Total comprehensive income		$ 384,468	$ 75,164
[1]	LTIs = long-term investments - common shares held.
[2]	Definitions as follows: "OCI" = Other Comprehensive Income (Loss); "SBC" = Equity Settled Stock Based Compensation; "Options" = Share Purchase Options; "RSUs" = Restricted Share Units; "LTI's" = Long-Term Investments; "Warrants" = Share Purchase Warrants.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 75,767	$ 98,521
Accounts receivable	2,396	3,194
Other	1,541	1,700
Total current assets	79,704	103,415
Non-current assets
Mineral stream interests	6,156,839	5,423,277
Early deposit mineral stream interests	30,241	21,722
Mineral royalty interest	9,107	9,107
Long-term equity investments	164,753	95,732
Investment in associates	2,562	2,994
Convertible note receivable	12,899	15,777
Other	13,941	11,289
Total non-current assets	6,390,342	5,579,898
Total assets	6,470,046	5,683,313
Current liabilities
Accounts payable and accrued liabilities	19,883	12,118
Current taxes payable	3,361
Current portion of performance share units	5,578
Other	19	25
Total current liabilities	28,841	12,143
Non-current liabilities
Bank debt	1,264,000	770,000
Deferred income taxes	111	76
Performance share units	5,178	1,430
Total non-current liabilities	1,269,289	771,506
Total liabilities	1,298,130	783,649
Shareholders' equity
Issued capital	3,516,437	3,472,029
Reserves	7,893	77,007
Retained earnings	1,647,586	1,350,628
Total shareholders' equity	5,171,916	4,899,664
Total liabilities and shareholders' equity	6,470,046	5,683,313
Commitments and contingencies	$ 0	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net earnings	$ 427,115	$ 57,703
Adjustments for Depreciation and depletion	253,343	263,352
Gain on disposal of mineral stream interest	(245,715)
Impairment charges		228,680
Interest expense	35,839	24,993
Equity settled stock based compensation	5,432	5,051
Performance share units	9,517	140
Income tax expense (recovery)	15,868	(886)
Loss on fair value adjustment of share purchase warrants held	124	6
Receipt of shares in exchange for contractual modifications		(7,500)
Share in losses of associate	432
Fair value (gain) loss on convertible note receivable	2,878	(215)
Investment income recognized in net earnings	(829)	(467)
Other	(46)	(214)
Change in non-cash working capital	8,964	(6,346)
Cash generated from operations before income taxes and interest	512,922	564,297
Income taxes paid	(960)	(579)
Interest paid	(35,373)	(25,243)
Interest received	824	333
Cash generated from operating activities	477,413	538,808
Financing activities
Bank debt repaid	(330,500)	(423,000)
Bank debt drawn	824,500
Credit facility extension fees	(1,205)	(1,311)
Share purchase options exercised	1,027	1,181
Dividends paid	(132,915)	(121,934)
Cash (used for) generated from financing activities	360,907	(545,064)
Investing activities
Mineral stream interests	(1,116,955)
Early deposit mineral stream interests	(8,709)	(1,721)
Net proceeds on disposal of mineral stream interests	226,000	1,022
Acquisition of long-term investments	(5,863)	(129)
Acquisition of convertible note receivable		(15,562)
Investment in associate		(2,994)
Proceeds on disposal of long-term investments	47,734
Dividend income received	80	60
Other	(3,613)	(249)
Cash used for investing activities	(861,326)	(19,573)
Effect of exchange rate changes on cash and cash equivalents	252	55
Decrease in cash and cash equivalents	(22,754)	(25,774)
Cash and cash equivalents, beginning of year	98,521	124,295
Cash and cash equivalents, end of year	$ 75,767	$ 98,521

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Total	Number of Shares [member]	Issued Capital [member]	Share Purchase Warrants Reserve [member]	Share Purchase Options Reserve [member]	Reserves Restricted Share Units Reserve [member]	LTI revaluation reserve (net of tax) [member]		Total Reserves [member]		Retained Earnings [member]
Balance at beginning of period at Dec. 31, 2016		$ 4,939,988		$ 3,445,914	$ 83,077	$ 26,063	$ 3,669	$ (57,508)	[1]	$ 55,301		$ 1,438,773
Balance, shares at beginning of period at Dec. 31, 2016		441,456,217	441,456,000
Total comprehensive income
Net earnings		$ 57,703										57,703
OCI	[1]	17,461						17,461		17,461
Total comprehensive income (loss)		75,164						17,461	[1]	17,461		57,703
Income tax recovery (expense)		65		65
SBC expense	[1]	5,051				3,037	2,014			5,051
Options exercised	[1]	$ 1,330		1,631		(301)				(301)
Options exercised, shares		70,600	71,000
RSUs released	[1]			505			(505)			(505)
RSUs released, shares		21,975	22,000
Dividends (Note 18.2)		$ (121,934)		23,914								(145,848)
Dividends (Note 18.2), shares		1,175,517	1,175,000
Balance end of period at Dec. 31, 2017		$ 4,899,664		$ 3,472,029	83,077	28,799	5,178	(40,047)	[1]	77,007		1,350,628
Balance, shares at end of period at Dec. 31, 2017		442,724,309	442,724,000	442,724,309
Total comprehensive income
Net earnings		$ 427,115										427,115
OCI	[1]	(42,647)						(42,647)		(42,647)
Total comprehensive income (loss)		384,468						(42,647)	[1]	(42,647)		427,115
Income tax recovery (expense)		14,389		$ 14,389
SBC expense	[1]	5,432				2,401	3,031			5,432
Options exercised	[1]	$ 878		1,076		(198)				(198)
Options exercised, shares		46,800	47,000
RSUs released	[1]			2,239			(2,239)			(2,239)
RSUs released, shares		104,178	104,000
Dividends (Note 18.2)		$ (132,915)		26,704								(159,619)
Dividends (Note 18.2), shares		1,461,074	1,461,000
Realized gain on disposal of LTIs (Note 16)		$ 34,061						(29,462)	[1]	(29,462)	[1]	29,462	[1]
Balance end of period at Dec. 31, 2018		$ 5,171,916		$ 3,516,437	$ 83,077	$ 31,002	$ 5,970	$ (112,156)	[1]	$ 7,893		$ 1,647,586
Balance, shares at end of period at Dec. 31, 2018		444,336,361	444,336,000	444,336,361
[1]	Definitions as follows: "OCI" = Other Comprehensive Income (Loss); "SBC" = Equity Settled Stock Based Compensation; "Options" = Share Purchase Options; "RSUs" = Restricted Share Units; "LTI's" = Long-Term Investments; "Warrants" = Share Purchase Warrants.

Description of Business and Nat

Description of Business and Nature of Operations	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Description of Business and Nature of Operations	1. Description of Business and Nature of Operations Wheaton Precious Metals Corp. is a mining company which generates its revenue primarily from the sale of precious metals. Wheaton Precious Metals Corp. (“Wheaton” or the “Company”), which is the ultimate parent company of its consolidated group, is incorporated and domiciled in Canada, and its principal place of business is at Suite 3500 - 1021 West Hastings Street, Vancouver, British Columbia, V6E 0C3. The Company trades on the Toronto Stock Exchange (“TSX”) and the New York Stock Exchange (“NYSE”) under the symbol WPM. The Company has entered into 23 long-term purchase agreements (three of which are early deposit agreements), with 17 different mining companies, for the purchase of precious metals and cobalt (“precious metal purchase agreements” or “PMPA”) relating to 19 mining assets which are currently operating, 9 which are at various stages of development and 2 which have been placed in care and maintenance, located in 11 countries. Pursuant to the PMPAs, Wheaton acquires metal production from the counterparties for an initial upfront payment plus an additional cash payment for each ounce or pound delivered which is fixed by contract, generally at or below the prevailing market price. The consolidated financial statements of the Company for the year ended December 31, 2018 were authorized for issue as of March 20, 2019 in accordance with a resolution of the Board of Directors.

Basis of Presentation and State

Basis of Presentation and Statement of Compliance	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Basis of Presentation and Statement of Compliance	2. Basis of Presentation and 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”) on a historical cost basis, except for financial assets which are not held for the purpose of collecting contractual cash flows on specified dates and derivative assets and derivative liabilities which have been measured at fair value as at the relevant balance sheet date. The consolidated financial statements are presented in United States (“US”) dollars, which is the Company’s functional currency, and all values are expressed in thousands unless otherwise noted. References to “Cdn$” refer to Canadian dollars. The preparation of financial statements in accordance with IFRS requires the use of certain accounting estimates. It also requires management to exercise judgment in applying the Company’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the financial statements are disclosed in Note 4.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Significant Accounting Policies	3. Significant Accounting Policies 3.1. New Accounting Standards Effective in 2018 IFRS 9 – Financial Instruments (amended 2014): On January 1, 2018, the Company adopted IFRS 9 (2014) – Financial Instruments (amended 2014) (“IFRS 9 (2014)”). The Company had previously adopted IFRS 9 (2009) – Financial Instruments effective January 1, 2010. The adoption of IFRS 9 (2014) did not have a material impact on the accounting policies and methods of application relative to the Company’s financial instruments. IFRS 15 – Revenue from Contracts with Customers: On January 1, 2018, the Company adopted IFRS 15 – Revenue from Contracts with Customers (“IFRS 15”) which supersedes IAS 18 – Revenue (“IAS 18”). IFRS 15 establishes a single five-step model framework for determining the nature, amount, timing and uncertainty of revenue and cash flows arising from a contract with a customer. The standard is effective for annual periods beginning on or after January 1, 2018. IFRS 15 requires entities to recognize revenue when ‘control’ of goods or services transfers to the customer whereas the previous standard, IAS 18, required entities to recognize revenue when the ‘risks and rewards’ of the goods or services transfer to the customer. The Company concluded that there is no change in the timing of revenue recognition of its gold and silver credit sales and its gold and silver concentrate sales under IFRS 15 compared to the previous standard as the point of transfer of risks and rewards of the gold and silver and the transfer of control of the gold and silver occur at the same time. As such, no adjustment was required to the Company’s consolidated financial statements as at January 1, 2017 or for the year ended December 31, 2017. Additionally, IFRS 15 requires that variable consideration should only be recognized to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur. The Company concluded that the adjustments relating to the final assay results for the quantity of concentrate sold under the terms of the concentrate sales contracts are not significant and do not constrain the recognition of revenue. 3.2. Principles of Consolidation The consolidated financial statements include the accounts of the Company and its 100% owned subsidiaries Wheaton Precious Metals International Ltd., Silver Wheaton Luxembourg S.a.r.l. and Wheaton Precious Metals (Cayman) Co. Subsidiaries are fully consolidated from the date on which the Company obtains a controlling interest. Control is defined as an investor’s power over an investee with exposure, or rights, to variable returns from the investee and the ability to affect the investor’s returns through its power over the investee. Subsidiaries are included in the consolidated financial results of the Company from the effective date of acquisition up to the effective date of disposition or loss of control. The financial statements of the subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. Balances, transactions, income and expenses between the Company and its subsidiaries are eliminated on consolidation. 3.3. Cash and Cash Equivalents Cash and cash equivalents include cash and highly liquid money market investments including short-term deposits, treasury bills, commercial paper, bankers’ depository notes and bankers’ acceptances with terms to maturity of less than three months. 3.4. Revenue Recognition Revenue relating to the sale of precious metals is recognized when control of the precious metal is transferred to the customer in an amount that reflects the consideration the Company expects to receive in exchange for those products. In determining whether the Company has satisfied a performance obligation, it considers the indicators of the transfer of control, which include, but are not limited to, whether: the Company has a present right to payment; the customer has legal title to the asset; the Company has transferred physical possession of the asset to the customer; and the customer has the significant risks and rewards of ownership of the asset. Under certain PMPAs, precious metal is acquired from the mine operator in the form of gold, silver or palladium credits, which is then sold through a network of third party brokers or dealers. Revenue from precious metal credit sales is recognized at the time of the sale of such credits, which is also the date that control of the precious metal is transferred to the customer. The Company will occasionally enter into forward contracts in relation precious metal deliveries that it is highly confident will occur within a given quarter. No forward contracts were outstanding at December 31, 2018 or December 31, 2017. The sales price is fixed at the delivery date based on either the terms of these short-term forward sales contracts or the spot price of the precious metal. Under certain PMPAs, precious metal is acquired from the mine operator in concentrate form, which is then sold under the terms of the concentrate sales contracts to third-party smelters or traders. Where the Company acquires precious metals in concentrate form, final precious metal prices are set on a specified future quotational period (the “Quotational Period”) pursuant to the concentrate sales contracts with third-party smelters, typically one to three months after the shipment date, based on market prices for precious metals. The contracts, in general, provide for a provisional payment based upon provisional assays and quoted precious metal prices. Final settlement is based upon the average applicable price for the Quotational Period applied to the actual number of precious metal ounces recovered calculated using confirmed smelter weights and settlement assays. Revenues and the associated cost of sales are recorded on a gross basis under these contracts at the time title passes to the buyer, which is also the date that control of the precious metal is transferred to the customer. The Company has concluded that the adjustments relating to the final assay results for the quantity of concentrate sold and the retroactive pricing adjustment for the Quotational Period are not significant and do not constrain the recognition of revenue. 3.5. Financial Instruments In November 2009, the IASB introduced IFRS 9, Financial Instruments (“IFRS 9”), which is part of a project to replace IAS 39, Financial Instruments: Recognition and Measurement. Adoption of IFRS 9 was required by January 1, 2018, with early adoption permitted. The Company elected to adopt IFRS 9 (2009) and the related consequential amendments effective January 1, 2010. On January 1, 2018, the Company adopted IFRS 9 (2014) – Financial Instruments (amended 2014) (“IFRS 9 (2014)”). The adoption of IFRS 9 (2014) did not materially impact the accounting policies and methods of application relative to the Company’s financial instruments. Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Financial assets and financial liabilities are initially measured at fair value. Transaction costs that are directly attributable to the acquisition or issue of financial assets and financial liabilities (other than financial assets and financial liabilities at fair value through net earnings) are added to or deducted from the fair value of the financial assets or financial liabilities, as appropriate, on initial recognition. Transaction costs directly attributable to the acquisition of financial assets or financial liabilities at fair value through net earnings are recognized immediately in net earnings. 3.6. Financial Assets Financial assets are subsequently measured at either amortized cost or fair value, depending on the classification of the financial assets. Financial Assets at Fair Value Through Other Comprehensive Income (“FVTOCI”) The Company’s long-term investments in common shares held are for long-term strategic purposes and not for trading. Upon the adoption of IFRS 9, the Company made an irrevocable election to designate these long-term investments in common shares held as FVTOCI as it believes that this provides a more meaningful presentation for long-term strategic investments, rather than reflecting changes in fair value in net earnings. Long-term investments in common shares held are initially measured at fair value. Subsequently, they are measured at fair value with gains and losses arising from changes in fair value recognized as a component of other comprehensive income (“OCI”) and accumulated in the long-term investment revaluation reserve. The cumulative gain or loss will not be reclassified to net earnings on disposal of these long-term investments but is reclassified to retained earnings. Dividends on these long-term investments in common shares held are recognized as a component of net earnings in the period they are received under the classification Other (Income) Expense. Financial Assets at Fair Value Through Net Earnings (“FVTNE”) Cash and cash equivalents are stated at FVTNE. Warrants held by the Company for long-term investment purposes are classified as FVTNE. These warrants are measured at fair value at the end of each reporting period, with any gains or losses arising on remeasurement recognized as a component of net earnings under the classification Other (Income) Expense. The Kutcho Convertible Note receivable (Note 15) is classified as FVTNE and is measured at fair value at the end of each reporting period by discounting the stream of future interest and principal payments at the rate of interest prevailing at the balance sheet date for instruments of similar term and risk (the market interest rate), and adding this value to the value of the convertibility feature which is estimated using a Black-Scholes model based on assumptions including risk free interest rate, expected dividend yield, expected volatility and expected remaining life of the Kutcho Convertible Note receivable. The resulting gains or losses (if any) arising on remeasurement is recognized as a component of net earnings under the classification Other (Income) Expense. As discussed in Note 3.4, the Company’s provisionally priced sales contain an embedded derivative that is reflected at fair value at the end of each reporting period. Fair value gains and losses related to the embedded derivative are included in revenue in the period they occur. Financial Assets at Amortized Cost Other receivables are non-interest Foreign Exchange Gains and Losses The fair value of financial assets denominated in a foreign currency is determined in that foreign currency and translated at the spot rate at the end of each reporting period. The foreign exchange component forms part of its fair value gain or loss. Therefore, · For financial assets that are classified as FVTNE, the foreign exchange component is recognized as a component of net earnings; · For financial assets that are classified as FVTOCI, the foreign exchange component is recognized as a component of OCI; and · For financial assets that are denominated in a foreign currency and are measured at amortized cost at the end of each reporting period, the foreign exchange gains and losses are determined based on the amortized cost of the instruments and are recognized as a component of net earnings. Derecognition of Financial Assets The Company derecognizes a financial asset only when the contractual rights to cash flows from the asset expire, or when it transfers the financial asset and substantially all the risks and rewards of ownership of the asset to another entity. If the Company neither transfers nor retains substantially all the risks and rewards of ownership and continues to control the transferred asset, the Company recognizes its retained interest in the asset and an associated liability for amounts it may have to pay. If the Company retains substantially all the risks and rewards of ownership of a transferred financial asset, the Company continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received. On derecognition of a financial asset that is classified as FVTOCI, the cumulative gain or loss (net of tax) previously accumulated in the long-term investment revaluation reserve is not reclassified to net earnings, but is reclassified to retained earnings. 3.7. Financial Liabilities and Equity Instruments Debt and equity instruments issued by the Company are classified as either financial liabilities or as equity in accordance with the substance of the contractual arrangements and the definition of a financial liability and equity instrument. All financial liabilities are subsequently measured at amortized cost using the effective interest method or at FVTNE, depending on the classification of the instrument. Equity Instruments An equity instrument is a contract that evidences a residual interest in the assets of an entity after deducting all of its liabilities. Equity instruments issued by the Company are recognized at the proceeds received less direct issue costs (net of any current or deferred income tax recovery attributable to such costs). Share Purchase Warrants Issued Share purchase warrants issued with an exercise price denominated in the Company’s functional currency (US dollars) are considered equity instruments with the consideration received reflected within shareholders’ equity under the classification of share purchase warrants reserve. Upon exercise, the original consideration is reallocated from share purchase warrants reserve to issued share capital along with the associated exercise price. Bank Debt Bank debt is initially measured at fair value, net of transaction costs, and is subsequently measured at amortized cost using the effective interest method. The effective interest method is a method of calculating the amortized cost of a financial liability and of allocating interest expense over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash payments through the expected life of the financial liability, or (where appropriate) a shorter period, to the net carrying amount on initial recognition. Other Financial Liabilities Accounts payable and accrued liabilities are stated at amortized cost, which approximate fair values due to the short terms to maturity. Foreign Exchange Gains and Losses The fair value of financial liabilities denominated in a foreign currency is determined in that foreign currency and translated at the spot rate at the end of each reporting period. Therefore, · For financial liabilities that are denominated in a foreign currency and are measured at amortized cost at the end of each reporting period, the foreign exchange gains and losses are determined based on the amortized cost of the instruments and are recognized as a component of net earnings; and · For financial liabilities that are classified as FVTNE, the foreign exchange component forms part of the fair value gains or losses and is recognized as a component of net earnings. Derecognition of Financial Liabilities The Company derecognizes financial liabilities when the Company’s obligations are discharged, cancelled or they expire. The difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash 3.8. Mineral Stream Interests Agreements for which settlement is called for in gold, silver, palladium or cobalt, the amount of which is based on production at the mines, are stated at cost less accumulated depletion and accumulated impairment charges, if any. The cost of the asset is comprised of its purchase price, any closing costs directly attributable to acquiring the asset, and, for qualifying assets, borrowing costs. The purchase price is the aggregate cash amount paid and the fair value of any other non-cash Depletion The cost of these mineral stream interests is separately allocated to reserves, resources and exploration potential. The value allocated to reserves is classified as depletable and is depleted on a unit-of-production non-depletable Asset Impairment Management considers each PMPA to be a separate cash generating unit (“CGU”), which is the lowest level for which cash inflows are largely independent of those of other assets. At the end of each reporting period, the Company assesses each PMPA to determine whether any indication of impairment exists. If such an indication exists, the recoverable amount of the PMPA is estimated in order to determine the extent of the impairment (if any). The recoverable amount of each PMPA is the higher of fair value less cost of disposal (“FVLCD”) and value in use (“VIU”). In determining the recoverable amounts of each of the Company’s CGU’s, the Company uses the FVLCD as this will generally be greater than or equal to the VIU. To determine the FVLCD that could be received from each PMPA in an arm’s length transaction at the measurement date, the Company estimates a range of potential values using the net asset value (“NAV”) methodology and the net present value (“NPV”) methodology (as described below), and then selects a value within this range which is the most representative of the estimated recoverable amount of the stream. NAV is estimated by using an appropriate discount rate to calculate the present value of the expected future cash flows associated with each mineral category. The values are adjusted for each mineral category dependent on the likelihood of conversion from resources to reserves. A market multiple is applied to the NAV computed in order to assess the estimated fair value. Precious metal companies typically trade at a market capitalization that is based on a multiple of their underlying NAV, with this market multiple being generally understood to take account of a variety of additional value and risk factors such as the ability to find and produce more metal than what is currently included in the life of mine plan, the benefit of precious metal price optionality, the potential remaining mine life and adjustments for relative mine and country risk. Consequently, a market participant would generally apply a NAV multiple when estimating the fair value of a precious metal interest. NPV is estimated by using a nominal discount rate to calculate the present value of expected future cash flows. The expected future cash flows are management’s best estimates of expected future revenues and costs. Under each valuation methodology, expected future revenues reflect an estimate of future payable production for each mine at which the Company has a PMPA based on detailed life of mine plans received from each of the partners. Expected future revenues also reflect management’s estimated long-term metal prices. Estimated future cash costs are generally fixed based on the terms of each PMPA as disclosed in Note 26. If the carrying amount of the PMPA exceeds its recoverable amount, the PMPA is considered impaired and an impairment charge is reflected as a component of net earnings so as to reduce the carrying amount to its recoverable value. A previously recognized impairment charge is reversed only if there has been an indicator of a potential impairment reversal and the resulting assessment of the PMPA’s recoverable amount exceeds its carrying value. If this is the case, the carrying amount of the PMPA is increased to its recoverable amount. The increased amount cannot exceed the carrying amount that would have been determined, net of depletion, had no impairment charge been recognized for the PMPA in prior years. Such reversal is reflected as a component of net earnings. 3.9. Investments in Associates Investments over which the Company exercises significant influence and that the Company does not control or jointly control are associates. Investments in associates are accounted for using the equity method, except when classified as held for sale. The equity method involves recording the initial investment at cost and subsequently adjusting the carrying value of the investment for the Company’s proportionate share of the profit or loss, other comprehensive income or loss and any other changes in the associate’s net assets such as dividends. The Company’s proportionate share of the associate’s profit or loss and other comprehensive income or loss is based on its most recent publicly available financial statements. Adjustments are made to align any inconsistencies between the Company’s accounting policies and the associate’s policies before applying the equity method. Adjustments are also made to account for depreciable assets based on their fair values at the acquisition date of the investment and for any impairment losses recognized by the associate. If the Company’s share of the associate’s losses equals or exceeds the Company’s investment in the associate, recognition of further losses is discontinued. After the Company’s interest is reduced to zero, additional losses will be provided for and a liability recognized only to the extent that the Company has incurred legal or constructive obligations to provide additional funding or make payments on behalf of the associate. If the associate subsequently reports profits, the Company resumes recognizing the Company’s share of those profits only after the Company’s share of the profits equals the Company’s share of losses not recognized. At each balance sheet date, management considers whether there is objective evidence of impairment in associates. If there is such evidence, management determines the amount of impairment to record, if any, in relation to the associate. 3.10. Borrowing and Debt Issue Costs Borrowing costs allocable to qualifying assets, which are assets that necessarily take a substantial period of preparation for their intended use, are capitalized and included in the carrying amounts of the related assets until such time as the assets are substantially ready for their intended use. Borrowing costs that do not relate to the acquisition or construction of qualifying assets are reflected as a component of net earnings under the classification Finance Costs, as incurred. For the purposes of determining whether borrowing costs are allocable to qualifying assets, general borrowings are first considered to relate to qualifying assets to the extent of the cumulative investment made by the Company. Debt issue costs on non-revolving 3.11. Stock Based Payment Transactions The Company recognizes a stock based compensation expense for all share purchase options and restricted share units (“RSUs”) awarded to employees, officers and directors based on the fair values of the share purchase options and RSUs at the date of grant. The fair values of share purchase options and RSUs at the date of grant are expensed over the vesting periods of the share purchase options and RSUs, respectively, with a corresponding increase to equity. The fair value of share purchase options is determined using the Black-Scholes option pricing model with market related inputs as of the date of grant. Share purchase options with graded vesting schedules are accounted for as separate grants with different vesting periods and fair values. The fair value of RSUs is the market value of the underlying shares at the date of grant. At the end of each reporting period, the Company re-assesses The Company recognizes a stock based compensation expense for performance share units (“PSUs”) which are awarded to eligible employees and are settled in cash. Compensation expense for the PSUs is recorded on a straight-line basis over the three year vesting period. This estimated expense is reflected as a component of net earnings over the vesting period of the PSUs with the related obligation recorded as a liability on the balance sheet. The amount of compensation expense is adjusted at the end of each reporting period to reflect (i) the fair market value of common shares; (ii) the number of PSUs anticipated to vest; and (iii) the anticipated performance factor. 3.12. Income Taxes Income tax expense comprises current and deferred income tax. Current and deferred income taxes are recognized as a component of net earnings except to the extent that it relates to items recognized directly in equity or as a component of OCI. Current income tax is the expected tax payable on the taxable income for the year, using tax rates enacted or substantively enacted at the end of the reporting period, and any adjustment to tax payable in respect of previous years. Deferred income tax is recognized using the liability method on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. Deferred income tax assets and liabilities are measured using tax rates and laws that have been enacted or substantively enacted at the end of the reporting period and which are expected to apply when the related deferred income tax assets are realized or the deferred income tax liabilities are settled. Deferred income tax liabilities are generally recognized for all taxable temporary differences. Deferred income tax assets are generally recognized for all deductible temporary differences and the carry forward of unused tax losses and tax credits to the extent that it is probable that reversing taxable temporary differences or sufficient taxable income will be available against which those deductible temporary differences and the carry forward of unused tax losses and tax credits can be utilized. Deferred income tax liabilities are recognized for taxable temporary differences arising on investments in subsidiaries except where the reversal of the temporary difference can be controlled and it is probable that the difference will not reverse in the foreseeable future. Deferred income tax assets arising from deductible temporary differences associated with such investments are only recognized to the extent that it is probable that there will be sufficient taxable income against which to utilize the benefits of the temporary differences and they are expected to reverse in the foreseeable future. The carrying amount of deferred income tax assets are reviewed at the end of each reporting period and reduced to the extent that it is no longer probable that reversing taxable temporary differences or sufficient taxable income will be available to allow all or part of the deferred income tax assets to be recovered. Deferred income tax assets and liabilities are not recognized for temporary differences arising from the initial recognition (other than in a business combination) of assets and liabilities in a transaction which does not affect either the accounting income or the taxable income. In addition, deferred income tax liabilities are not recognized if the temporary difference arises from the initial recognition of goodwill. 3.13. Earnings Per Share Earnings per share calculations are based on the weighted average number of common shares and common share equivalents issued and outstanding during the year. Diluted earnings per share is calculated using the treasury method which requires the calculation of diluted earnings per share by assuming that outstanding share purchase options and warrants with an exercise price that exceeds the average market price of the common shares for the period are exercised, and the proceeds are used to repurchase shares of the Company at the average market price of the common shares for the period. 3.14. Foreign Currency Translation The functional currency is the currency of the primary economic environment in which an entity operates. The consolidated financial statements are presented in US dollars, which is the functional currency of the Company and its subsidiaries. Foreign currency monetary assets and liabilities are translated into US dollars at the exchange rates prevailing at the balance sheet date. Non-monetary 3.15. Leasing Leases are classified as finance leases whenever the terms of the lease transfer substantially all of the risks and rewards of ownership to the lessee. All other leases are classified as operating leases. At December 31, 2018 and December 31, 2017, the Company was not a party to any finance leases. The Company as the Lessee Operating lease payments are recognized on a straight-line basis over the term of the lease, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased assets are consumed. In the event that lease incentives are received to enter into operating leases, such incentives are recognized as a liability. The aggregate benefit of incentives is recognized as a reduction to rental expense on a straight-line basis over the term of the lease, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased assets are consumed. 3.16. Provisions Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that the Company will be required to settle the obligation, and a reliable estimate can be made of the amount required to settle the obligation. The amount recognized as a provision is the best estimate of the consideration required to settle the present obligation at the end of the reporting period, taking into account the risks and uncertainties surrounding the obligation. Where a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, a receivable is recognized as an asset if it is virtually certain that reimbursement will be received and the amount of the receivable can be measured reliably. 3.17. Future Changes in Accounting Policies The IASB has issued the following new or amended standards: Standards required to be applied for periods beginning on or after January 1, 2019: · IFRS 16 – Leases: In January 2016, the IASB and the FASB completed its joint project to address concerns by users of financial statements in respect of reduced comparability between financial statements due to the different accounting treatment applied to operating leases as compared to finance leases by removing the distinction between operating leases and finance leases and rather having all leases accounted for as a finance lease, subject to limited exceptions for short-term leases and leases of low value assets. The Company is currently evaluating the impact of this standard and anticipates that upon adoption of this standard, its leases will be capitalized under the classification Right-of-Use · IFRIC 23 – Uncertainty over Income Tax Treatments: In June 2017, the IASB issued IFRIC 23 which is effective for periods beginning on or after January 1, 2019. IFRIC 23 provides guidance on the accounting for current and deferred tax liabilities and assets in circumstances in which there is uncertainty over income tax treatments. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Statement of Earnings. Early adoption of the above standards is permitted.

Key Sources of Estimation Uncer

Key Sources of Estimation Uncertainty and Critical Accounting Judgments	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Key Sources of Estimation Uncertainty and Critical Accounting Judgments	4. Key Sources of Estimation Uncertainty and Critical Accounting Judgments The preparation of the Company’s consolidated financial statements in conformity with IFRS requires management to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities and contingent liabilities at the date of the consolidated financial statements and reported amounts of revenues and expenses during the reporting period. Estimates and assumptions are continuously evaluated and are based on management’s experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. However, actual outcomes can differ from these estimates. Information about significant areas of estimation uncertainty and judgments made by management in preparing the consolidated financial statements are described below. Key Sources of Estimation Uncertainty 4.1. Attributable Reserve, Resource and Exploration Potential Estimates Mineral stream interests are significant assets of the Company, with a carrying value of $6.2 billion at December 31, 2018. This amount represents the capitalized expenditures related to the acquisition of the mineral stream interests, net of accumulated depletion and accumulated impairment charges, if any. The Company estimates the reserves, resources and exploration potential relating to each agreement. Reserves are estimates of the amount of metals contained in ore that can be economically and legally extracted from the mining properties in respect of which the Company has PMPAs. Resources are estimates of the amount of metals contained in mineralized material for which there is a reasonable prospect for economic extraction from the mining properties in respect of which the Company has PMPAs. Exploration potential represents an estimate of additional reserves and resources which may be discovered through the mine operator’s exploration program. The Company adjusts its estimates of reserves, resources (where applicable) and exploration potential (where applicable) to reflect the Company’s percentage entitlement to metals produced from such mines. The Company compiles its estimates of its reserves and resources based on information supplied by appropriately qualified persons relating to the geological data on the size, density and grade of the ore body, and require complex geological and geostatistical judgments to interpret the data. The estimation of recoverable reserves and resources is based upon factors such as estimates of foreign exchange rates, commodity prices, future capital requirements, and production costs along with geological assumptions and judgments made in estimating the size and grade of the ore body. The Company estimates exploration potential based on assumptions surrounding the ore body continuity which requires judgement as to future success of any exploration programs undertaken by the mine operator. Changes in the reserve estimates, resource estimates or exploration potential estimates may impact upon the carrying value of the Company’s mineral stream interests and depletion charges. 4.2. Depletion As described in Note 3.8, the Company’s mineral stream interests are separately allocated to reserves, resources and exploration potential. The value allocated to reserves is classified as depletable and is depleted on a unit-of-production non-depletable 4.3. Impairment of Assets As more fully described in Note 3.8, the Company assesses each PMPA at the end of every reporting period to determine whether any indication of impairment or impairment reversal exists. If such an indication exists, the recoverable amount of the PMPA is estimated in order to determine the extent of the impairment or impairment reversal (if any). The calculation of the recoverable amount requires the use of estimates and assumptions such as long-term commodity prices, discount rates, recoverable ounces of attributable metals, and operating performance. The price of precious metals and cobalt has been extremely volatile over the past several years. The Company monitors spot and forward metal prices and if necessary re-evaluates re-evaluate 4.4. Valuation of Stock Based Compensation As more fully described in Note 3.11, the Company has various forms of stock based compensation, including share purchase options, restricted share units (“RSUs”) and performance share units (“PSUs”). The calculation of the fair value of share purchase options, RSUs and PSUs issued requires the use of estimates as more fully described in Notes 19.2, 19.3, and 20.1, respectively. 4.5. Valuation of Convertible Note Receivable As more fully described in Notes 3.6 and 5.8.3, the Company measures its convertible note receivable with Kutcho Copper Corp. at fair value for financial reporting purposes. This calculation requires the use of estimates and assumptions such as rate of interest prevailing at the balance sheet date for instruments of similar term and risk, expected dividend yield, expected volatility and expected remaining life of the convertible note receivable. 4.6. Valuation of Minto Derivative Liability As more fully described in Note 5.8.3, the Company’s Minto PMPA has a pricing mechanism whereby there is an increase to the production payment per ounce of gold delivered to Wheaton over the current fixed price in periods where the market price of copper is lower than $2.50 per pound. As this pricing mechanism meets the definition of a derivative, it is reflected at fair value for financial reporting purposes. This calculation requires the use of estimates and assumptions such as long-term price of copper, recoverable ounces of gold and operating performance. 4.7. Contingencies Due to the size, complexity and nature of the Company’s operations, various legal and tax matters are outstanding from time to time, including those matters described in Note 26. By their nature, contingencies will only be resolved when one or more future events occur or fail to occur. The assessment of contingencies inherently involves the exercise of significant judgment and estimates of the outcome of future events. If the Company is unable to resolve any of these matters favorably, there may be a material adverse impact on the Company’s financial performance, cash flows or results of operations. In the event that management’s estimate of the future resolution of these matters changes, the Company will recognize the effects of the changes in its consolidated financial statements in the appropriate period relative to when such changes occur. Critical Accounting Judgments 4.8. Functional Currency The functional currency for the Company and each of its subsidiaries is the currency of the primary economic environment in which the entity operates. As a result of the following factors, the Company has determined that the functional currency of each entity is the US dollar: · The entities’ revenues are denominated in US dollars; · The entities’ cash cost of sales are denominated in US dollars; · The majority of the entities’ cash is held in US dollars; and · The Company generally seeks to raise capital in US dollars. Determination of the functional currency may involve certain judgments to determine the primary economic environment and the Company reconsiders the functional currency of its entities if there is a change in events and conditions which determined the primary economic environment. 4.9. Significant Influence over Kutcho Note 14 describes Kutcho Copper Corp. (“Kutcho”) as an associate though the Company only owns an 11% ownership interest in Kutcho. The Company has determined it has significant influence over Kutcho by virtue of the convertible instruments of Kutcho that the Company owns. 4.10. Income Taxes The interpretation and application of existing tax laws, regulations or rules in Canada, the Cayman Islands, Barbados, Luxembourg, the Netherlands or any of the countries in which the Company’s subsidiaries or the mining operations are located or to which deliveries of precious metals, precious metal credits or cobalt are made requires the use of judgment. The likelihood that tax positions taken will be sustained is assessed based on facts and circumstances of the relevant tax position considering all available evidence. Differing interpretation of these laws, regulations or rules could result in an increase in the Company’s taxes, or other governmental charges, duties or impositions. Refer to Notes 23 and 26 for more information. In assessing the probability of realizing deferred income tax assets, the Company makes estimates related to expectations of future taxable income and expected timing of reversals of existing temporary differences. Such estimates are based on forecasted cash flows from operations which require the use of estimates and assumptions such as long-term commodity prices and recoverable metal ounces. The estimates and assumptions are consistent with those used in testing asset impairment of PMPAs. The amount of deferred income tax assets recognized on the balance sheet could be reduced if the actual results differ significantly from forecast. The Company reassesses its deferred income tax assets at the end of each reporting period.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Financial Instruments	5. Financial Instruments 5.1. Capital Risk Management The Company manages its capital to ensure that it will be able to continue as a going concern while maximizing the return to stakeholders through the optimization of the debt and equity balance. The capital structure of the Company consists of debt (Note 17) and equity attributable to common shareholders, comprising of issued capital (Note 18), accumulated reserves (Note 19) and retained earnings. The Company is not subject to any externally imposed capital requirements with the exception of complying with the minimum tangible net worth covenant under the credit agreement governing bank debt (Note 17). The Company is in compliance with the debt covenants at December 31, 2018, as described in Note 17.1. 5.2. Categories of Financial Assets and Liabilities Other receivables are non-interest Note December 31 December 31 (in thousands) 2018 2017 Financial assets Financial assets mandatorily measured at FVTNE Cash and cash equivalents $ 75,767 $ 98,521 Trade receivables from provisional concentrate sales, net of fair value adjustment 6, 9 1,332 1,398 Long-term investments - warrants held 16 - 124 Convertible note receivable 15 12,899 15,777 Investments in equity instruments designated as at FVTOCI Long-term investments - common shares held 16 164,753 95,608 Financial assets measured at amortized cost Other accounts receivable 9 1,064 1,796 Total financial assets $ 255,815 $ 213,224 Financial liabilities Financial liabilities at amortized cost Accounts payable and accrued liabilities 19,883 12,118 Bank debt 17 1,264,000 770,000 Total financial liabilities $ 1,283,883 $ 782,118 5.3. Credit Risk Credit risk is the risk that the counterparty to a financial instrument will cause a financial loss for the Company by failing to discharge its obligations. To mitigate exposure to credit risk on financial assets, the Company has established policies to limit the concentration of credit risk, to ensure counterparties demonstrate minimum acceptable credit worthiness and to ensure liquidity of available funds. The Company closely monitors its financial assets and does not have any significant concentration of credit risk. The Company invests surplus cash in short-term, high credit quality, money market instruments. In addition, counterparties used to sell precious metals are all large, international organizations with strong credit ratings and the balance of trade receivables owed to the Company in the ordinary course of business is not significant. Therefore, credit risk associated with trade receivables at December 31, 2018 is considered to be negligible. The Company’s maximum exposure to credit risk related to its financial assets is as follows: December 31 December 31 (in thousands) Note 2018 2017 Cash and cash equivalents $ 75,767 $ 98,521 Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,332 1,398 Other accounts receivables 9 1,064 1,796 Convertible note receivable 15 12,899 15,777 Maximum exposure to credit risk related to financial assets $ 91,062 $ 117,492 5.4. Liquidity Risk The Company has in place a rigorous planning and budgeting process to help determine the funds required to support the Company’s normal operating requirements on an ongoing basis and its expansionary plans. The Company ensures that there are sufficient committed loan facilities to meet its short-term business requirements, taking into account its anticipated cash flows from operations and its holdings of cash and cash equivalents. As at December 31, 2018, the Company had cash and cash equivalents of $76 million (December 31, 2017 - $99 million) and working capital of $51 million (December 31, 2017 - $91 million). The Company holds equity investments of several companies (Note 16) with a combined market value at December 31, 2018 of $165 million (December 31, 2017 - $96 million). The daily exchange traded volume of these shares, including the shares underlying the warrants, is not sufficient for the Company to liquidate its position in a short period of time without potentially affecting the market value of the shares. These shares and warrants are held for strategic purposes and are considered long-term investments and therefore, as part of the Company’s planning, budgeting and liquidity analysis process, these investments are not relied upon to provide operational liquidity. The following table summarizes the timing associated with the Company’s remaining contractual payments relating to its financial liabilities. The table reflects the undiscounted cash flows of financial liabilities based on the earliest date on which the Company can be required to pay (assuming that the Company is in compliance with all of its obligations). The table includes both interest and principal cash flows. To the extent that applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period. As at December 31, 2018 (in thousands) 2019 2020 2021 2022 2023 Total Non-derivative Bank debt ¹ $ - $ - $ - $ - $ 1,264,000 $ 1,264,000 Interest on bank debt ² 53,845 50,021 46,564 45,584 46,541 242,555 Accounts payable and accrued liabilities 19,883 - - - - 19,883 Performance share units 3 5,578 3,890 1,288 - - 10,756 Total $ 79,306 $ 53,911 $ 47,852 $ 45,584 $ 1,310,541 $ 1,537,194 1) Assumes the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. On February 27, 2019, the term of the revolving credit facility was extended by an additional year, with the facility now maturing on February 27, 2024. 2) As the applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period combined with the assumption that the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. 3) Assumes a weighted average performance factor of 141% (see Note 20.1). 5.5. Currency Risk The Company undertakes certain transactions denominated in Canadian dollars, including certain operating expenses and the acquisition of strategic long-term investments. As a result, the Company is exposed to fluctuations in the value of the Canadian dollar relative to the United States dollar. The carrying amounts of the Company’s Canadian dollar denominated monetary assets and monetary liabilities at the end of the reporting period are as follows: December 31 December 31 (in thousands) 2018 2017 Monetary assets Cash and cash equivalents $ 731 $ 453 Accounts receivable 637 71 Long-term investments - common shares held 161,421 90,003 Long-term investments - warrants held - 124 Convertible note receivable 12,899 15,777 Other long-term assets 1,105 717 Total Canadian dollar denominated monetary assets $ 176,793 $ 107,145 Monetary liabilities Accounts payable and accrued liabilities $ 16,128 $ 5,542 Current taxes payable 3,361 - Performance share units 8,808 1,165 Total Canadian dollar denominated monetary liabilities $ 28,297 $ 6,707 The following tables detail the Company’s sensitivity to a 10% increase or decrease in the Canadian dollar relative to the United States dollar, representing the sensitivity used when reporting foreign currency risk internally to key management personnel and represents management’s assessment of the reasonably possible change in exchange rates. As at December 31, 2018 Change in Canadian Dollar (in thousands) 10% Increase 10% Decrease Increase (decrease) in net earnings $ (1,292 ) $ 1,292 Increase (decrease) in other comprehensive income 16,142 (16,142 ) Increase (decrease) in total comprehensive income $ 14,850 $ (14,850 ) As at December 31, 2017 Change in Canadian Dollar (in thousands) 10% 10% Increase (decrease) in net earnings $ 1,043 $ (1,043) Increase (decrease) in other comprehensive income 9,000 (9,000) Increase (decrease) in total comprehensive income $ 10,043 $ (10,043) 5.6. Interest Rate Risk The Company is exposed to interest rate risk on its outstanding borrowings and short-term investments. Presently, all of the Company’s outstanding borrowings are at floating interest rates. The Company monitors its exposure to interest rates and has not entered into any derivative contracts to manage this risk. During the year ended December 31, 2018, the weighted average effective interest rate paid by the Company on its outstanding borrowings was 3.57% (2017 – 2.57%). During the years ended December 31, 2018 and December 31, 2017, a fluctuation in interest rates of 100 basis points (1 percent) would have impacted the amount of interest expensed by approximately $10 million. 5.7. Other Price Risk The Company is exposed to equity price risk as a result of holding long-term investments in common shares of various companies. The Company does not actively trade these investments. If equity prices had been 10% higher or lower at the respective balance sheet date, other comprehensive income for the years ended December 31, 2018 and December 31, 2017 would have increased/decreased by approximately $16 million and $10 million, respectively, as a result of changes in the fair value of common shares held. 5.8. Fair Value Estimation The Company classifies its fair value measurements within a fair value hierarchy, which reflects the significance of the inputs used in making the measurements as defined in IFRS 13 – Fair Value Measurements (“IFRS 13”). Level 1 - Unadjusted quoted prices at the measurement date for identical assets or liabilities in active markets. Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3 - Unobservable inputs which are supported by little or no market activity. The following table sets forth the Company’s financial assets and liabilities measured at fair value by level within the fair value hierarchy. As required by IFRS 13, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. December 31, 2018 (in thousands) Note Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 75,767 $ 75,767 $ - $ - Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,332 - 1,332 - Long-term investments - common shares held 16 164,753 164,753 - - Long-term investments - warrants held 16 - - - - Convertible note receivable 15 12,899 - - 12,899 $ 254,751 $ 240,520 $ 1,332 $ 12,899 December 31, 2017 (in thousands) Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 98,521 $ 98,521 $ - $ - Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,398 - 1,398 - Long-term investments - common shares held 16 95,608 95,608 - - Long-term investments - warrants held 16 124 - 124 - Convertible note receivable (Note 15) 15 15,777 - - 15,777 $ 211,428 $ 194,129 $ 1,522 $ 15,777 Other accounts receivables and accounts payables and accrued liabilities are non-interest The Company’s bank debt (Note 17.1) is reported at amortized cost using the effective interest method. The carrying value of the bank debt approximates its fair value. 5.8.1. Valuation Techniques for Level 1 Assets Cash and Cash Equivalents The Company’s cash and cash equivalents are valued using quoted market prices in active markets and, as such, are classified within Level 1 of the fair value hierarchy. Long-Term Investments in Common Shares Held The Company’s long-term investments in common shares held are valued using quoted market prices in active markets and, as such, are classified within Level 1 of the fair value hierarchy. The fair value of the long-term investments in common shares held is calculated as the quoted market price of the common share multiplied by the quantity of shares held by the Company. 5.8.2. Valuation Techniques for Level 2 Assets Accounts Receivable Arising from Sales of Metal Concentrates The Company’s trade receivables and accrued liabilities from provisional concentrate sales are valued based on forward prices of gold and silver to the expected date of final settlement (Note 6). As such, these receivables and/or liabilities are classified within Level 2 of the fair value hierarchy. Long-Term Investments in Warrants Held The fair value of the Company’s long-term investments in warrants held that are not traded in an active market are determined using a Black-Scholes model based on assumptions including risk free interest rate, expected dividend yield, expected volatility and expected warrant life which are supported by observable current market conditions and as such are classified within Level 2 of the fair value hierarchy. The use of reasonably possible alternative assumptions would not significantly affect the Company’s results. 5.8.3. Valuation Techniques for Level 3 Assets Convertible Note Receivable The fair value of the Kutcho Convertible Note receivable (Note 15), which is not traded in an active market, is determined by discounting the stream of future interest and principal payments at the rate of interest prevailing at the balance sheet date for instruments of similar term and risk (the market interest rate), and adding this value to the value of the convertibility feature which is estimated using a Black-Scholes model based on assumptions including risk free interest rate, expected dividend yield, expected volatility and expected remaining life of the Kutcho Convertible Note receivable. As the expected volatility and market interest rate are not observable inputs, the Kutcho Convertible Note receivable is classified within Level 3 of the fair value hierarchy and any changes in fair value are reflected on the Consolidated Statement of Earnings under the classification Other (Income) Expense (Note 8). Management estimates that the market interest rate on similar borrowings without the conversion feature was approximately 15% and has used an implied volatility of 30% in valuing the convertibility feature. Holding all other variables constant, a fluctuation in interest rates of 1% would have impacted the valuation by approximately $0.6 million while a fluctuation in the implied volatility used of 5% would have impacted the valuation by approximately $0.2 million. Minto Derivative Liability The production payment per ounce of gold delivered to Wheaton under the Minto PMPA is to be increased over the fixed price in periods where the market price of copper is lower than $2.50 per pound. As this pricing mechanism meets the definition of a derivative, it is reflected at fair value for financial reporting purposes. At December 31, 2018 and December 31, 2017, the Company estimated the fair value of this derivative liability to be $NIL. As per Capstone’s news release dated October 11, 2018, Capstone has elected to place the Minto mine on care and maintenance.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Revenue	6. Revenue Years Ended December 31 (in thousands) 2018 2017 Sales Gold Gold credit sales $ 431,618 54 % $ 394,809 47% Concentrate sales 9,575 1 % 29,132 3% $ 441,193 55 % $ 423,941 50% Silver Silver credit sales $ 290,152 37 % $ 365,251 43% Concentrate sales 53,427 7 % 54,023 7% $ 343,579 44 % $ 419,274 50% Palladium Palladium credit sales $ 9,240 1 % $ - 0% Total sales revenue $ 794,012 100 % $ 843,215 100% Gold, Silver and Palladium Credit Sales Under certain PMPAs, precious metal is acquired from the mine operator in the form of precious metal credits, which is then sold through a network of third party brokers or dealers. Revenue from precious metal credit sales is recognized at the time of the sale of such credits, which is also the date that control of the precious metal is transferred to the customer. During the year ended December 31, 2018, sales to 3 financial institutions accounted for 29%, 22% and 13% of the Company’s revenue as compared to sales to 3 financial institutions that accounted for 32%, 23% and 11% of the Company’s revenue during the comparable period of the previous year. The Company would not be materially affected should any of these financial institutions cease to buy precious metal credits from the Company as these sales would be redirected to alternate financial institutions. The Company will occasionally enter into forward contracts in relation to precious metal deliveries that it is highly confident will occur within a given quarter. No forward contracts were outstanding at December 31, 2018 or December 31, 2017. The sales price is fixed at the delivery date based on either the terms of these short-term forward sales contracts or the spot price of precious metal. Concentrate Sales Under certain PMPAs, gold and/or silver is acquired from the mine operator in concentrate form, which is then sold under the terms of the concentrate sales contracts to third-party smelters or traders. Where the Company acquires precious metal in concentrate form, final precious metal prices are set on a specified future quotational period (the “Quotational Period”) pursuant to the concentrate sales contracts with third-party smelters, typically one to three months after the shipment date, based on market prices for precious metal. The contracts, in general, provide for a provisional payment based upon provisional assays and quoted gold and silver prices. Final settlement is based upon the average applicable price for the Quotational Period applied to the actual number of precious metal ounces recovered calculated using confirmed smelter weights and settlement assays. Revenues and the associated cost of sales are recorded on a gross basis under these contracts at the time title passes to the buyer, which is also the date that control of the precious metal is transferred to the customer. The Company has concluded that the adjustments relating to the final assay results for the quantity of concentrate sold and the retroactive pricing adjustment for the Quotational Period are not significant and do not constrain the recognition of revenue. At December 31, 2018, the Company had outstanding provisionally priced sales of $7 million (December 31, 2017 - $4 million) where the quotational period pricing was estimated based on the forward price for gold and silver. These sales consisted of 500 ounces of gold and 0.4 million ounces of silver (December 31, 2017 - 800 ounces of gold and 0.2 million ounces of silver) which had a fair value gain adjustment of approximately $0.5 million (December 31, 2017 - fair value gain adjustment of approximately $0.3 million) associated with the embedded derivative. For each one dollar per ounce increase or decrease in the realized gold price, revenue would increase or decrease by approximately $500 (December 31, 2017 - $800) and for each one cent per ounce increase or decrease in the realized silver price, revenue would increase or decrease by approximately $4,500 (December 31, 2017 - $2,000).

General and Administrative

General and Administrative	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
General and Administrative	7. General and Administrative Years Ended December 31 (in thousands) Note 2018 2017 Salaries and benefits Salaries and benefits, excluding PSUs $ 14,397 $ 12,054 PSUs 1 20.1 9,517 140 Total salaries and benefits $ 23,914 $ 12,194 Depreciation 1,057 972 Donations 2,610 2,141 Professional fees 8,559 3,938 Other 10,078 10,377 General and administrative before equity settled stock based compensation $ 46,218 $ 29,622 Equity settled stock based compensation 2 Stock options 19.2 $ 2,401 $ 3,037 RSUs 19.3 3,031 2,014 Total equity settled stock based compensation $ 5,432 $ 5,051 Total general and administrative $ 51,650 $ 34,673 1) The PSU accrual related to the anticipated fair value of the PSUs issued uses a weighted average performance factor of 141% during the year ended December 31, 2018 as compared to 17% during the comparable period of 2017. 2) Equity settled stock based compensation is a non-cash

Other (Income) Expense

Other (Income) Expense	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Other (Income) Expense	8. Other (Income) Expense Years Ended December 31 (in thousands) Note 2018 2017 Interest income $ (750 ) $ (407 ) Dividends received from equity investments designated as FVTOCI relating to investments held at the end of the reporting period 16 (78 ) (60 ) Proceeds relative to the Mercator Minerals bankruptcy - (1,022 ) Guarantee fees - Primero Revolving Credit Facility (858 ) (2,683 ) Fees for contract amendments and reconciliations (248 ) (9,424 ) Share of losses of associate 14 432 - Foreign exchange (gain) loss (144 ) 270 Interest and penalties related to CRA Settlement 1 23 4,317 - Net gain/(loss) arising on financial assets mandatorily measured at FVTPL Loss on fair value adjustment of share purchase warrants held 16 124 6 Loss on fair value adjustment of Kutcho Convertible Note 15 2,878 (215 ) Other 153 - Total other (income) expense $ 5,826 $ (13,535 ) 1) Reference to the CRA Settlement refers to the settlement of the 2005 to 2010 tax dispute and the application of the CRA Settlement principles to the 2011 to 2017 taxation years. Refer to the discussion on page 108 for more information. Proceeds relative to the Mercator Minerals bankruptcy During the three months ended March 31, 2017, the Company received an additional $1 million settlement related to the bankruptcy of Mercator Minerals Ltd. (“Mercator”) with whom Wheaton had a PMPA relative to Mercator’s Mineral Park mine in the United States (the “Mercator Bankruptcy”). This silver interest was fully written off during the year ended December 31, 2014 and as such further proceeds, if any, will be recognized as a component of net earnings. Guarantee fees - Primero Revolving Credit Facility On March 30, 2017, Wheaton provided a guarantee to the lenders under Primero Mining Corp.’s (“Primero”) previously outstanding revolving credit facility for which Primero paid a fee of 5% per annum (the “Guarantee”). The Guarantee was cancelled on May 10, 2018, being the date First Majestic Silver Corp. (“First Majestic”) completed the acquisition of all of the issued and outstanding common shares of Primero. Fees for contract amendments and reconciliations During 2017, the Company received various fees and one-time

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Accounts Receivable	9. Accounts Receivable December 31 December 31 (in thousands) Note 2018 2017 Trade receivables from provisional concentrate sales, net of fair value adjustment 6 $ 1,332 $ 1,398 Other accounts receivables 1,064 1,796 Total accounts receivable $ 2,396 $ 3,194

Mineral Stream Interests

Mineral Stream Interests	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Mineral Stream Interests	10. Mineral Stream Interests Year Ended December 31, 2018 Cost Accumulated Depletion & Impairment 1 Carrying (in thousands) Balance Additions Disposal Balance Balance Depletion Disposal Balance Gold interests Sudbury 2 $ 623,864 $ - - $ 623,864 $ (243,876 ) $ (13,525 ) - $ (257,401 ) $ 366,463 Salobo 3,059,876 - - 3,059,876 (251,144 ) (102,672 ) - (353,816 ) 2,706,060 Constancia 136,058 - - 136,058 (14,007 ) (4,504 ) - (18,511 ) 117,547 San Dimas - 220,429 - 220,429 - (12,234 ) - (12,234 ) 208,195 Stillwater - 239,357 - 239,357 - (2,925 ) - (2,925 ) 236,432 Other 3 402,232 - - 402,232 (370,414 ) (10,459 ) - (380,873 ) 21,359 $ 4,222,030 $ 459,786 $ - $ 4,681,816 $ (879,441 ) $ (146,319 ) $ - $ (1,025,760 ) $ 3,656,056 Silver interests San Dimas $ 190,331 $ - $ (190,331 ) $ - $ (55,469 ) $ (3,575 ) $ 59,044 $ - $ - Peñasquito 524,626 - - 524,626 (121,376 ) (14,528 ) - (135,904 ) 388,722 Antamina 900,343 - - 900,343 (142,705 ) (47,561 ) - (190,266 ) 710,077 Constancia 302,948 - - 302,948 (41,145 ) (15,572 ) - (56,717 ) 246,231 Other 4 1,282,837 202 - 1,283,039 (759,702 ) (20,699 ) - (780,401 ) 502,638 $ 3,201,085 $ 202 $ (190,331 ) $ 3,010,956 $ (1,120,397 ) $ (101,935 ) $ 59,044 $ (1,163,288 ) $ 1,847,668 Palladium interests Stillwater $ - $ 263,726 - $ 263,726 $ - $ (4,033 ) - $ (4,033 ) $ 259,693 Cobalt interests Voisey’s Bay $ - $ 393,422 - $ 393,422 $ - $ - - $ - $ 393,422 $ 7,423,115 $ 1,117,136 $ (190,331 ) $ 8,349,920 $ (1,999,838 ) $ (252,287 ) $ 59,044 $ (2,193,081 ) $ 6,156,839 1) Includes cumulative impairment charges to December 31, 2018 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $338 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million. 2) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 3) Comprised of the Minto, Rosemont and 777 gold interests. 4) Comprised of the currently owned Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Rosemont and 777 silver interests in addition to the Lagunas Norte, Pierina and Veladero silver interests, all of which expired on March 31, 2018. Year Ended December 31, 2017 Cost Accumulated Depletion & Impairment 1 Carrying (in thousands) Balance Reductions² Disposal³ Balance 2017 Balance Depletion Disposal³ Impairment Balance Gold interests Sudbury 4 $ 623,864 $ - $ - $ 623,864 $ (222,329 ) $ (21,547 ) $ - $ - $ (243,876 ) $ 379,988 Salobo 3,059,876 - - 3,059,876 (155,041 ) (96,103 ) - - (251,144 ) 2,808,732 Constancia 136,058 - - 136,058 (10,388 ) (3,619 ) - - (14,007 ) 122,051 Other 5 402,232 - - 402,232 (350,999 ) (19,415 ) - - (370,414 ) 31,818 $ 4,222,030 $ - $ - $ 4,222,030 $ (738,757 ) $ (140,684 ) $ - $ - $ (879,441 ) $ 3,342,589 Silver interests San Dimas $ 190,331 $ - $ - $ 190,331 $ (49,756 ) $ (5,713 ) $ - $ - $ (55,469 ) $ 134,862 Peñasquito 524,626 - - 524,626 (106,549 ) (14,827 ) - - (121,376 ) 403,250 Antamina 900,343 - - 900,343 (84,537 ) (58,168 ) - - (142,705 ) 757,638 Constancia 302,948 - - 302,948 (26,977 ) (14,168 ) - - (41,145 ) 261,803 Other 3 1,329,731 (4,935 ) (41,959 ) 1,282,837 (544,161 ) (28,820 ) 41,959 (228,680 ) (759,702 ) 523,135 $ 3,247,979 $ (4,935 ) $ (41,959 ) $ 3,201,085 $ (811,980 ) $ (121,696 ) $ 41,959 $ (228,680 ) $ (1,120,397 ) $ 2,080,688 $ 7,470,009 $ (4,935 ) $ (41,959 ) $ 7,423,115 $ (1,550,737) $ (262,380) $ 41,959 $ (228,680) $ (1,999,838) $ 5,423,277 1) Includes cumulative impairment charges to December 31, 2017 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $338 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million. 2) On March 29, 2017, the Company amended its PMPA with Alexco Resource Corp. (“Alexco”) to adjust the silver production payment so that it will be a percentage of the spot silver price that increases with lower mill silver head grades and lower silver prices, and decreases with higher mill silver head grades and higher silver prices, subject to certain ceiling and floor grades and prices. In addition, the outside completion date was extended to December 31, 2019 and the area of interest was expanded to include properties currently owned by Alexco and properties acquired by Alexco in the future which fall within a one kilometer radius of existing Alexco holdings in the Keno Hill Silver District. As consideration, on April 10, 2017, Alexco issued 3 million shares to Wheaton which had a fair value of $5 million. The fair value of these shares have been reflected as a reduction to the cost base of the Keno Hill silver interest. 3) Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests. The Cozamin PMPA expired on April 4, 2017 and the fully depleted value of this contract has been reflected as a disposal. 4) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 5) Comprised of the Minto, Rosemont and 777 gold interests. The value allocated to reserves is classified as depletable upon a mining operation achieving first production and is depleted on a unit-of-production non-depletable December 31, 2018 December 31, 2017 (in thousands) Depletable Non- Depletable Total Depletable Non- Depletable Total Gold interests Sudbury 1 $ 308,041 $ 58,422 $ 366,463 $ 315,421 $ 64,567 $ 379,988 Salobo 2,171,292 534,768 2,706,060 2,224,133 584,599 2,808,732 Constancia 108,403 9,144 117,547 112,432 9,619 122,051 San Dimas 101,421 106,774 208,195 - - - Stillwater 209,569 26,863 236,432 - - - Other 2 21,359 - 21,359 31,818 - 31,818 $ 2,920,085 $ 735,971 $ 3,656,056 $ 2,683,804 $ 658,785 $ 3,342,589 Silver interests San Dimas $ - $ - $ - $ 38,110 $ 96,752 $ 134,862 Peñasquito 284,194 104,528 388,722 293,968 109,282 403,250 Antamina 353,679 356,398 710,077 380,738 376,900 757,638 Constancia 230,983 15,248 246,231 240,950 20,853 261,803 Other 3 87,386 415,252 502,638 90,366 432,769 523,135 $ 956,242 $ 891,426 $ 1,847,668 $ 1,044,132 $ 1,036,556 $ 2,080,688 Palladium interests Stillwater $ 248,299 $ 11,394 $ 259,693 $ - $ - $ - Cobalt interests Voisey’s Bay $ - $ 393,422 $ 393,422 $ - $ - $ - $ 4,124,626 $ 2,032,213 $ 6,156,839 $ 3,727,936 $ 1,695,341 $ 5,423,277 1) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 2) Comprised of the Minto, Rosemont and 777 gold interests. 3) Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests. The Cozamin PMPA expired on April 4, 2017 while the Lagunas Norte, Pierina and Veladero silver interests expired on March 31, 2018. Termination of the San Dimas Silver Interest and Acquisition of the San Dimas Gold Interest On October 15, 2004, the Company entered into an agreement with Goldcorp Inc. (“Goldcorp”) to acquire an amount equal to 100% of the silver produced by Goldcorp’s Luismin mining operations in Mexico, including the San Dimas mine. On August 6, 2010, Goldcorp completed the sale of San Dimas to Primero, and pursuant to the amended silver purchase agreement with Primero (the “San Dimas SPA”), the Company acquired 100% of the payable silver produced at San Dimas up to 6 million ounces annually, and 50% of any excess for the life of the mine. Goldcorp also provided a guarantee with respect to the delivery by Primero of all silver produced and owing to the Company until 2029 (the “Goldcorp Guarantee”). On May 10, 2018, First Majestic completed the previously disclosed acquisition of all the issued and outstanding common shares of Primero (the “Acquisition”). In connection with the Acquisition, on May 10, 2018, the Company terminated the San Dimas SPA and entered into a new precious metal purchase agreement with First Majestic relating to the San Dimas mine (the “San Dimas PMPA”). As consideration for terminating the San Dimas SPA, the Company received a cash payment of $220 million and 20,914,590 First Majestic common shares with a fair value of $151 million (the “First Majestic Shares 1 (in thousands) Cash received $ 220,000 Fair value of First Majestic shares received 151,000 Fee from Goldcorp in exchange for release from the 10,000 Total net proceeds from the disposal of the San Dimas SPA $ 381,000 Less: carrying value plus closing costs (135,285 ) Gain on disposal of the San Dimas SPA $ 245,715 Under the terms of the new San Dimas PMPA, for which the Company paid total upfront cash consideration of $220 million, the Company is entitled to an amount equal to 25% of the payable gold production plus an additional amount of gold equal to 25% of the payable silver production converted to gold at a fixed gold to silver exchange ratio of 70:1. 2 Acquisition of the Voisey’s Bay Cobalt Interest On June 11, 2018, the Company entered into an agreement to acquire from Vale S.A. (“Vale”) an amount of cobalt equal to 42.4% of the cobalt production from its Voisey’s Bay mine, located in Canada, until the delivery of 31 million pounds of cobalt and 21.2% of cobalt production thereafter for the life of mine for a total upfront cash payment of $390 million. In addition, Wheaton will make ongoing payments of 18% of the spot price of cobalt per pound of cobalt delivered under the agreement until the market value of cobalt delivered to Wheaton, net of the per pound cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price of cobalt thereafter. Payable rates for cobalt in concentrate have generally been fixed at 93.3%. Deliveries under the contract are scheduled to begin effective January 1, 2021. Acquisition of the Stillwater Gold and Palladium Interest On July 16, 2018, the Company entered into an agreement with Sibanye Gold Limited (“Sibanye-Stillwater”) to acquire an amount of gold and palladium equal to a fixed percentage of production from the Stillwater and East Boulder mines located in Montana in the United States (collectively referred to as the “Stillwater” mines) for a total upfront cash payment of $500 million. The Company is entitled to the attributable gold and palladium production for which an offtaker payment is received after July 1, 2018 at a fixed payable rate of 99% for gold and 99.6% for palladium. Under the terms of the agreement, the Company has acquired an amount of gold equal to 100% of the gold production for the life of the mine and an amount of palladium equal to 4.5% of the palladium production until 375,000 ounces are delivered to the Company, 2.25% of Stillwater palladium production thereafter until 550,000 ounces are delivered and 1% of Stillwater palladium production thereafter for the life of mine. In addition to the initial upfront cash consideration, the Company will make ongoing payments of 18% of the spot price of gold and palladium for each ounce of gold and palladium delivered under the agreement until the market value of gold and palladium delivered to Wheaton, net of the per ounce cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price thereafter 3 1 The First Majestic Shares represent approximately 11% of First Majestic’s current issued and outstanding shares and are subject to volume selling restrictions. 2 If the average gold to silver price ratio decreases to less than 50:1 or increases to more than 90:1 for a period of 6 months or more, then the “70” shall be revised to “50” or “90”, as the case may be, until such time as the average gold to silver price ratio is between 50:1 to 90:1 for a period of 6 months or more in which event the “70” shall be reinstated. 3 The production payment is subject to further downward adjustment based upon Sibanye-Stillwater’s leverage ratios.

Impairment of Mineral Stream In

Impairment of Mineral Stream Interests	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Impairment of Mineral Stream Interests	11. Impairment of Mineral Stream Interests As more fully described in Note 3.8, at every reporting period the Company assesses each PMPA to determine whether any indication of impairment or impairment reversal exists. Based on the Company’s analysis, the following PMPAs were determined to be impaired: Years Ended December 31 (in thousands) 2018 Silver interests Other silver interests Pascua-Lama $ - $ 228,680 Total impairment charges $ - $ 228,680 Pascua-Lama – Indicator of Impairment at December 31, 2017 In January 2018, the Company was notified that Barrick had received a revised resolution from Chile’s environmental regulator (the Superintendencia del Medio Ambiente, or “SMA”) in connection with the previously disclosed SMA regulatory sanctions requiring the closure of existing infrastructure on the Chilean side of the Pascua-Lama project. In light of the order to close surface facilities in Chile, Barrick reclassified Pascua-Lama’s proven and probable gold reserves of approximately 14 million ounces, which were based on an open pit mine plan, as measured and indicated resources. As a result, Wheaton also reclassified 151.7 million ounces of silver mineral reserves associated with Pascua-Lama as measured and indicated resources. As this resolution affects Barrick’s ability to advance the Pascua-Lama project as an open pit mine, coupled with the resulting reclassification of open-pit The Pascua-Lama PMPA had a carrying value at December 31, 2017 of $485 million. Management estimated that the recoverable amount at December 31, 2017 under the Pascua-Lama PMPA was $256 million, representing its FVLCD and resulting in an impairment charge of $229 million. The recoverable amount related to the Pascua-Lama PMPA was estimated using an average discount rate of 9% and a nominal silver price of $16.70 for the current year with a 2% inflationary factor being applied thereafter. As this valuation technique requires the use of estimates and assumptions such as long-term commodity prices, discount rates, recoverable ounces of silver and operating performance, it is classified within Level 3 of the fair value hierarchy.

Early Deposit Mineral Stream In

Early Deposit Mineral Stream Interests	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Early Deposit Mineral Stream Interests	12. Early Deposit Mineral Stream Interests Early deposit mineral stream interests represent agreements relative to early stage development projects whereby Wheaton can choose not to proceed with the agreement once certain documentation has been received including, but not limited to, feasibility studies, environmental studies and impact assessment studies (please see Note 26 for more information). Once Wheaton has elected to proceed with the agreement, the carrying value of the stream will be transferred to Mineral Stream Interests. The following table summarizes the early deposit mineral stream interests currently owned by the Company: Attributable Purchased Early Deposit Mineral Stream Mine Location of Upfront 1 Upfront 1, 2 Total Gold Silver Term of Toroparu Sandspring Guyana $ 15,500 $ 138,000 $ 153,500 10% 50% Life of Mine Cotabambas Panoro Peru 7,000 133,000 140,000 25% ³ 100% ³ Life of Mine Kutcho Kutcho Canada 7,000 58,000 65,000 100% 4 100% 4 Life of Mine $ 29,500 $ 329,000 $ 358,500 1) Expressed in thousands of United States dollars; excludes closing costs and capitalized interest, where applicable. 2) Please refer to Note 26 for details of when the remaining upfront consideration to be paid becomes due. 3) Once 90 million silver equivalent ounces attributable to Wheaton have been produced, the attributable production to be purchased will decrease to 66.67% of silver production and 16.67% of gold production for the life of mine. 4) Once 51,000 ounces of gold and 5.6 million ounces of silver have been delivered to Wheaton, the stream will decrease to 66.67% of gold and silver production for the life of mine.

Mineral Royalty Interest

Mineral Royalty Interest	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Mineral Royalty Interest	13. Mineral Royalty Interest On August 7, 2014, the Company purchased a 1.5% net smelter return royalty interest (the “Royalty”) in the Metates properties located in Mexico from Chesapeake Gold Corp. (“Chesapeake”) for the life of mine. Under the terms of the agreement, the Company paid total upfront cash consideration of $9 million and at any time prior to August 7, 2019, Chesapeake may reacquire two-thirds 2 3 To date, no revenue has been recognized and no depletion has been taken with respect to this royalty agreement.

Investment in Associate

Investment in Associate	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Investment in Associate	14. Investment in Associate Kutcho Effective December 14, 2017, in connection with the Kutcho Early Deposit Agreement (Note 12), the Company participated in an equity financing undertaken by Kutcho acquiring, by way of private placement, 6,153,846 common shares and warrants to acquire an additional 3,076,923 common shares of Kutcho for total consideration of $3 million (Cdn$4 million). Additionally, the Company advanced to Kutcho $16 million (Cdn$20 million) in exchange for a subordinated secured convertible term debt loan agreement receivable bearing interest at 10% per annum (the “Kutcho Convertible Note”) (see Note 15). As at December 31, 2018, Kutcho had 57,147,628 shares issued and outstanding, resulting in Wheaton owning approximately 11% of Kutcho on a non-diluted non-fully non-diluted Kutcho’s principal address of the Company is 1030 West Georgia Street, Suite 717, Vancouver, British Columbia, Canada, V6E 2Y3. A summary of the carrying value of the Kutcho Investment in Associate and the losses recognized as a component of the Company’s net earnings during 2018 and 2017 is presented below: December 31, 2018 (in thousands) Carrying Share of Investment in Associate - Kutcho $ 2,562 $ (432) December 31, 2017 (in thousands) Carrying Share of Investment in Associate - Kutcho $ 2,994 $ -

Convertible Note Receivable

Convertible Note Receivable	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Convertible Note Receivable	15. Convertible Note Receivable Kutcho Effective December 14, 2017, in connection with the Kutcho Early Deposit Agreement, the Company advanced to Kutcho $16 million (Cdn$20 million) and received the Kutcho Convertible Note. The Kutcho Convertible Note, which has a seven year term to maturity, carries interest at 10% per annum, compounded and payable semi-annually. Kutcho has the option to defer the first three interest payments until December 31, 2019, at which point one half of the deferred interest is payable in cash and the other half of the deferred interest can, at Kutcho’s option, either (i) be paid in cash; or (ii) be deferred for an additional period not to exceed 4 years. In the event Kutcho elects to make the second deferral, Wheaton can, at its option, convert the remaining deferred interest into common shares of Kutcho. At any time prior to the maturity date, the Company has the right to convert all or any part of the outstanding amount of the Kutcho Convertible Note into common shares of Kutcho at Cdn$0.8125 per share. Once the Kutcho Convertible Note has been outstanding for 24 months, Kutcho has the right to repay the Kutcho Convertible Note early, subject to the applicable pre-payment · 25% of the outstanding amount if pre-paid · 20% of the outstanding amount if pre-paid · 15% of the outstanding amount if pre-paid The Kutcho Convertible Note is revalued quarterly by discounting the stream of future interest and principal payments at the rate of interest prevailing at the balance sheet date for instruments of similar term and risk, and adding this value to the value of the convertibility feature which is estimated using a Black-Scholes model based on assumptions including risk free interest rate, expected dividend yield, expected volatility and expected remaining life of the Kutcho Convertible Note. A continuity schedule of the Kutcho Convertible Note from January 1, 2017 to December 31, 2018 is presented below: Convertible At January 1, 2017 $ - Amount advanced 15,562 Fair value gain (loss) reflected in net earnings 215 At December 31, 2017 $ 15,777 Fair value gain (loss) reflected in net earnings (2,878) At December 31, 2018 $ 12,899

Long-Term Equity Investments

Long-Term Equity Investments	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Long-Term Equity Investments	16. Long-Term Equity Investments December 31 December 31 (in thousands) 2018 2017 Common shares held $ 164,753 $ 95,608 Warrants held - 124 Total $ 164,753 $ 95,732 Common Shares Held December 31, 2018 (in thousands) Shares Percentage of Fair Value Fair Value Realized Bear Creek 13,264,305 13% $ 10,112 $ (11,247) $ - Sabina 11,700,000 4% 10,549 (10,622) - Arizona Mining n.a. n.a. - 20,153 34,061 First Majestic 20,914,590 11% 123,187 (27,813) - Other 20,905 (10,456) - $ 164,753 $ (39,985) $ 34,061 December 31, 2017 (in thousands) Shares Percentage of Fair Value Fair Value Bear Creek 13,264,305 13% $ 21,358 $ (1,859) Sabina 11,700,000 5% 21,171 12,631 Arizona Mining 10,000,000 3% 27,581 9,333 Other 25,498 (1,553) Total common shares held $ 95,608 $ 18,552 Warrants Held December 31, 2018 (in thousands) Fair Value Fair Value Warrants held - Kutcho $ - $ (124) December 31, 2017 (in thousands) Fair Value Fair Value Warrants held - Kutcho $ 124 $ (6) The Company’s long-term investments in common shares (“LTI’s”) are held for long-term strategic purposes and not for trading purposes. As such, the Company has elected to reflect any fair value adjustments, net of tax, as a component of other comprehensive income (“OCI”). The cumulative gain or loss will not be reclassified to net earnings on disposal of these long-term investments. While long-term investments in warrants are also held for long-term strategic purposes, they meet the definition of a derivative and therefore are classified as financial assets with fair value adjustments being recorded as a component of net earnings under the classification Other (Income) Expense. Warrants that do not have a quoted market price are valued using a Black-Scholes option pricing model. By holding these long-term investments, the Company is inherently exposed to various risk factors including currency risk, market price risk and liquidity risk. Acquisitions of Long-Term Investments On March 29, 2017, the Company amended its PMPA with Alexco to adjust the silver production payment so that it will be a percentage of the spot silver price that increases with lower mill silver head grades and lower silver prices, and decreases with higher mill silver head grades and higher silver prices, subject to certain ceiling and floor grades and prices. In addition, the outside completion date was extended to December 31, 2019 and the area of interest was expanded to include properties currently owned by Alexco and properties acquired by Alexco in the future which fall within a one kilometer radius of existing Alexco holdings in the Keno Hill Silver District. As consideration, on April 10, 2017 Alexco issued 3 million shares to Wheaton which had a fair value of $5 million. In October 2017, Capstone Mining Corp. (“Capstone”) issued 6.8 million shares to Wheaton with a value of $8 million as consideration for certain agreements made between the Company and Capstone, including amendments to the Minto PMPA (the “Minto PMPA Amendment”), with the primary modification being to increase the production payment per ounce of gold delivered to Wheaton over the current fixed price in periods where the market price of copper is lower than $2.50 per pound. In connection with the termination of the San Dimas SPA (Note 10), on May 10, 2018, the Company received 20,914,590 First Majestic common shares with a fair value of $151 million 1 On April 25, 2018, the Company invested $1 million by participating in a private placement undertaken by Tradewind Markets, Inc. On July 17, 2018, the Company acquired 7,093,392 common shares of Adventus Zinc Corporation (“Adventus”) in a private placement transaction, for total consideration of $5 million (Cdn$6 million), representing 9.99% of Adventus’ issued and outstanding common shares. Concurrently, the Company paid an additional Cdn$1 million to acquire a right of first refusal on any new streaming or royalty transactions on precious metals on the Adventus existing properties in Ecuador and a right of first offer on any subsequently acquired properties in Ecuador (the “Adventus ROFR”). The shares of Keno Hill, Capstone, Tradewind and Adventus have been classified as part of the Other long-term investments in these financial statements, while the Adventus ROFR has been classified as a component of Other non-current Disposal of Long-Term Investments On August 10, 2018, South32 Limited announced that it had completed its acquisition of all the issued and outstanding common shares of Arizona Mining Inc. (“Arizona Mining”), which resulted in a disposition of the Company’s investment in Arizona Mining for total proceeds of $48 million (Cdn$62 million), and a realized gain of $34 million.

Credit Facilities

Credit Facilities	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Credit Facilities	17. Credit Facilities 17.1. Bank Debt December 31 December 31 (in thousands) 2018 2017 Current portion $ - $ - Long-term portion 1,264,000 770,000 Gross bank debt outstanding 1 $ 1,264,000 $ 770,000 1) There is $6 million unamortized debt issue costs associated with the Revolving Facility which have been recorded as a long-term asset under the classification Other. On February 27, 2019, the term of the Company’s $2 billion revolving term loan (“Revolving Facility”) was extended by an additional year, with the facility now maturing on February 27, 2024. The Company incurred fees of $1 million in relation to this extension. The Company’s Revolving Facility has financial covenants which require the Company to maintain: (i) a net debt to tangible net worth ratio of less than or equal to 0.75:1; and (ii) an interest coverage ratio of greater than or equal to 3.00:1. Only cash interest expenses are included for the purposes of calculating the interest coverage ratio. The Company is in compliance with these debt covenants as at December 31, 2018. 1 The First Majestic Shares represent approximately 11% of First Majestic’s current issued and outstanding shares and are subject to volume selling restrictions. At the Company’s option, amounts drawn under the Revolving Facility incur interest based on the Company’s leverage ratio at either (i) LIBOR plus 1.20% to 2.20%; or (ii) the Bank of Nova Scotia’s Base Rate plus 0.20% to 1.20%. Undrawn amounts under the Revolving Facility are subject to a stand-by The Revolving Facility, which is classified as a financial liability and reported at amortized cost using the effective interest method, can be drawn down at any time to finance acquisitions, investments or for general corporate purposes. 17.2. Letters of Guarantee As more fully described in Note 23, on March 15, 2016, the Company entered into a letter of guarantee in favour of Her Majesty the Queen in Right of Canada, as represented by the Minister of National Revenue in the amount of Cdn$192 million. On March 15, 2017 and 2018, additional letters of guarantee in the amount of Cdn$11 million and Cdn$10 million, respectively, were delivered to the Canada Revenue Agency (“CRA”) as security for additional estimated interest for the respective following year. The letters of guarantee, which carried an annual fee of 100 basis points, were cancelled effective December 18, 2018 in connection with the CRA Settlement. 17.3. Finance Costs A summary of the Company’s finance costs relative to the above facilities during the period is as follows: Years Ended December 31 (in thousands) Note 2018 2017 Interest Expense During Period Average principle outstanding during period $ 1,005,222 $ 970,750 Average effective interest rate during period 17.1 3.57% 2.57% Total interest expense incurred during period $ 35,839 $ 24,993 Costs related to undrawn credit facilities 17.1 3,707 3,839 Letter of guarantee 17.2 1,641 1,567 Total finance costs $ 41,187 $ 30,399

Issued Capital

Issued Capital	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Issued Capital	18. Issued Capital December 31 December 31 (US dollars in thousands) Note 2018 2017 Issued capital Share capital issued and outstanding: 444,336,361 common shares (December 31, 2017: 442,724,309 common shares) 18.1 $ 3,516,437 $ 3,472,029 18.1. Shares Issued The Company is authorized to issue an unlimited number of common shares having no par value and an unlimited number of preference shares issuable in series. As at December 31, 2018, the Company had no preference shares outstanding. A continuity schedule of the Company’s issued and outstanding common shares from January 1, 2017 to December 31, 2018 is presented below: Number Weighted At January 1, 2017 441,456,217 Share purchase options exercised 1 70,600 Cdn$24.83 Restricted share units released 1 21,975 $0.00 Dividend reinvestment plan 2 1,175,517 US$20.34 At December 31, 2017 442,724,309 Share purchase options exercised 1 46,800 Cdn$24.28 Restricted share units released 1 104,178 $0.00 Dividend reinvestment plan 2 1,461,074 US$18.28 At December 31, 2018 444,336,361 1) The weighted average price of share purchase options exercised and restricted share units released represents the respective exercise price. 2) The Company has implemented a dividend reinvestment plan (“DRIP”) whereby shareholders can elect to have dividends reinvested directly into additional Wheaton common shares. The weighted average price for common shares issued under the DRIP represents the volume weighted average price of the common shares on the five trading days preceding the dividend payment date, less a discount of 3%. 18.2. Dividends Declared Years Ended December 31 2018 2017 Dividends declared per share $ 0.36 $ 0.33 Average number of shares eligible for dividend 443,386 441,962 Total dividends paid $ 159,619 $ 145,848 Paid as follows: Cash $ 132,915 83% $ 121,934 84% DRIP 2 26,704 17% 23,914 16% Total dividends paid $ 159,619 100% $ 145,848 100% Shares issued under the DRIP 1,461,074 1,175,517 1) US dollars in thousands, except per share amounts. 2) The Company has implemented a dividend reinvestment plan (“DRIP”) whereby shareholders can elect to have dividends reinvested directly into additional Wheaton common shares at a discount of 3% of the Average Market Price, as defined in the DRIP. 3) As at December 31, 2018, cumulative dividends of $918 million have been declared and paid by the Company.

Reserves

Reserves	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Reserves	19. Reserves Note December 31 December 31 (in thousands) 2018 2017 Reserves Share purchase warrants 19.1 $ 83,077 $ 83,077 Share purchase options 19.2 31,002 28,799 Restricted share units 19.3 5,970 5,178 Long-term investment revaluation reserve, net of tax 19.4 (112,156 ) (40,047 ) Total reserves $ 7,893 $ 77,007 19.1. Share Purchase Warrants The Company’s share purchase warrants (“warrants”) are presented below: Number of Weighted Exchange Share Warrants outstanding 10,000,000 $43.75 1.00 $ 83,077 The warrants, which expire on February 28, 2023, were valued using a Black-Scholes option pricing model. Each warrant entitles the holder the right to purchase one of the Company’s common shares. 19.2. Share Purchase Options The Company has established an equity settled share purchase option plan whereby the Company’s Board of Directors may, from time to time, grant options to employees or consultants. The maximum term of any share purchase option may be ten years, but generally options are granted with a term to expiry of five years. The exercise price of an option is not less than the closing price on the TSX on the last trading day preceding the grant date. The vesting period of the options is determined at the discretion of the Company’s Board of Directors at the time the options are granted, but generally vest over a period of two years. Each share purchase option converts into one common share of Wheaton on exercise. No amounts are paid or payable by the recipient on receipt of the option. The options do not carry rights to dividends or voting rights. Options may be exercised at any time from the date of vesting to the date of their expiry, subject to certain black-out The Company expenses the fair value of share purchase options that are expected to vest on a straight-line basis over the vesting period using the Black-Scholes option pricing model to estimate the fair value for each option at the date of grant. The Black-Scholes model was developed for use in estimating the fair value of traded options that have no vesting restrictions. The model requires the use of subjective assumptions, including expected share price volatility. Historical data has been considered in setting the assumptions. Expected volatility is determined by considering the trailing 30-month Years Ended December 31 2018 2017 Black-Scholes weighted average assumptions Grant date share price and exercise price Cdn$26.25 Cdn$27.37 Expected dividend yield 1.73% 1.15% Expected volatility 35% 36% Risk-free interest rate 1.91% 0.94% Expected option life, in years 2.5 2.5 Weighted average fair value per option granted Cdn$5.49 Cdn$5.85 Number of options issued during the period 549,210 508,360 Total fair value of options issued (000’s) $ 2,347 $ 2,236 The following table summarizes information about the options outstanding and exercisable at December 31, 2018: Exercise Price (Cdn$) Exercisable Non- Exercisable Total Options Weighted $23.26 916,800 - 916,800 2.2 years $24.11 4,220 4,220 8,440 3.6 years $24.45¹ 157,200 - 157,200 2.2 years $25.48 809,150 - 809,150 1.2 years $25.89¹ 6,500 6,500 13,000 3.6 years $26.07 713,000 - 713,000 0.2 years $26.24 - 442,770 442,770 4.2 years $27.51 203,200 203,200 406,400 3.2 years $27.58¹ 126,100 - 126,100 1.2 years $27.60 910 910 1,820 3.4 years $27.84¹ - 100,590 100,590 4.2 years $27.96 - 1,690 1,690 4.4 years $28.14¹ 33,700 35,250 68,950 3.2 years $29.86¹ - 2,190 2,190 4.4 years $31.74¹ 94,250 - 94,250 0.2 years $34.86¹ 13,000 - 13,000 0.6 years $39.52 8,000 - 8,000 2.6 years 3,086,030 797,320 3,883,350 1.5 years 1) US$ share purchase options converted to Cdn$ using the exchange rate of 1.3642, being the Cdn$/US$ exchange rate at December 31, 2018. A continuity schedule of the Company’s share purchase options reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Share At January 1, 2017 $ 26,063 Recognition of fair value of share purchase options issued 3,037 Share purchase options exercised (301) At December 31, 2017 $ 28,799 Recognition of fair value of share purchase options issued 2,401 Share purchase options exercised (198) At December 31, 2018 $ 31,002 At December 31, 2018, there were 3,883,350 share purchase options outstanding with a weighted average exercise price of Cdn$25.71 per option. For the comparable period in 2017, there were 4,232,260 share purchase options outstanding with a weighted average exercise price of Cdn$26.71 per option. A continuity schedule of the Company’s outstanding share purchase options from January 1, 2017 to December 31, 2018 is presented below: Number of Weighted At January 1, 2017 4,097,400 Cdn$27.36 Granted (fair value - $2 million or Cdn$5.85 per option) 508,360 27.37 Exercised (70,600) 24.83 Forfeited (6,500) 27.51 Expired (296,400) 34.67 At December 31, 2017 4,232,260 Cdn$26.71 Granted (fair value - $2 million or Cdn$5.49 per option) 549,210 26.25 Exercised (46,800) 24.28 Forfeited (7,320) 29.24 Expired (844,000) 32.70 At December 31, 2018 3,883,350 Cdn$25.71 As it relates to share purchase options, during the year ended December 31, 2018, the weighted average share price at the time of exercise was Cdn$28.10 per share, as compared to Cdn$27.80 per share per share during the comparable period in 2017. 19.3. Restricted Share Units (“RSUs”) The Company has established an RSU plan whereby RSUs will be issued to eligible employees or directors as determined by the Company’s Board of Directors or the Company’s Compensation Committee. RSUs give the holder the right to receive a specified number of common shares at the specified vesting date. RSUs generally vest over a period of two years. Compensation expense related to RSUs is recognized over the vesting period based upon the fair value of the Company’s common shares on the grant date and the awards that are expected to vest. The fair value is calculated with reference to the closing price of the Company’s common shares on the TSX on the business day prior to the date of grant. RSU holders receive a cash payment based on the dividends paid on the Company’s common shares in the event that the holder of a vested RSU has elected to defer the release of the RSU to a future date. This cash payment is reflected as a component of net earnings under the classification General and Administrative. A continuity schedule of the Company’s restricted share units reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Restricted Share At January 1, 2017 $ 3,669 Recognition of fair value of RSUs issued 2,014 Restricted share units released (505 ) At December 31, 2017 $ 5,178 Recognition of fair value of RSUs issued 3,031 Restricted share units released (2,239 ) At December 31, 2018 $ 5,970 During the year ended December 31, 2018, the Company issued 161,060 RSUs with a fair value of $3 million or Cdn$26.25 per RSU. For the same period in 2017, the Company issued 145,950 RSUs with a fair value of $3 million or Cdn$27.39 per RSU. As of December 31, 2018, there were 370,133 RSUs outstanding. For the comparable period in 2017, there were 313,846 RSUs outstanding. 19.4. Long-Term Investment Revaluation Reserve The Company’s long-term investments in common shares (Note 16) are held for long-term strategic purposes and not for trading purposes. Upon the application of IFRS 9, Financial Instruments, the Company has chosen to designate these long-term investments in common shares as financial assets with fair value adjustments being recorded as a component of OCI as it believes that this provides a more meaningful presentation for long-term strategic investments, rather than reflecting changes in fair value as a component of net earnings. As some of these long-term investments are denominated in Canadian dollars, changes in their fair value is affected by both the change in share price in addition to changes in the Cdn$/US$ exchange rate. Where the fair value of a long-term investment in common shares held exceeds its tax cost, the Company recognizes a deferred income tax liability. To the extent that the value of the long-term investment subsequently declines, the deferred income tax liability is reduced. However, where the fair value of the long-term investment decreases below the tax cost, the Company does not recognize a deferred income tax asset on the unrealized capital loss unless it is probable that the Company will generate future capital gains to offset the loss. A continuity schedule of the Company’s long-term investment revaluation reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Note Change in Fair Value Deferred Tax Recovery (Expense) Total At January 1, 2017 $ (56,662) $ (846) $ (57,508) Unrealized gain (loss) on LTIs 1 18,552 (1,091) 17,461 At December 31, 2017 $ (38,110 ) $ (1,937) $ (40,047) Unrealized gain (loss) on LTIs 1 (39,985) (2,662) (42,647) Reallocate reserve to retained earnings upon disposal of LTIs 1 16 (34,061) 4,599 (29,462) At December 31, 2018 $ (112,156) $ - $ (112,156) 1) LTIs refers to long-term investments in common shares held.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Stock Based Compensation	20. Stock Based Compensation The Company’s stock based compensation consists of share purchase options (Note 19.2), restricted share units (Note 19.3) and performance share units (Note 20.1). The accrued value of share purchase options and restricted share units are reflected as reserves in the shareholder’s equity section of the Company’s balance sheet while the accrued value associated with performance share units is reflected as an accrued liability. 20.1. Performance Share Units (“PSUs”) The Company has established a Performance Share Unit Plan (“the PSU plan”) whereby PSUs will be issued to eligible employees as determined by the Company’s Board of Directors or the Company’s Compensation Committee. PSUs issued under the PSU plan entitle the holder to a cash payment at the end of a three year performance period equal to the number of PSUs granted, multiplied by a performance factor and multiplied by the fair market value of a Wheaton common share on the expiry of the performance period. The performance factor can range from 0% to 200% and is determined by comparing the Company’s total shareholder return to those achieved by various peer companies, the Philadelphia Gold and Silver Index and the price of gold and silver. Compensation expense for the PSUs is recorded on a straight-line basis over the three year vesting period. The amount of compensation expense is adjusted at the end of each reporting period to reflect (i) the fair value of common shares; (ii) the number of PSUs anticipated to vest; and (iii) the anticipated performance factor. During the year ended December 31, 2018, the Company issued 220,260 PSUs as compared to 207,220 PSUs during the comparable period of the previous year. A continuity schedule of the Company’s outstanding PSUs (assuming a performance factor of 100% is achieved over the performance period) from January 1, 2017 to December 31, 2018 is presented below: Number of At January 1, 2017 717,564 Granted 207,220 Dividend equivalent participation 10,304 Paid 1 (275,439) Forfeited (3,050) At December 31, 2017 656,599 Granted 220,260 Paid 1 (218,615) Forfeited (2,517) At December 31, 2018 655,727 1) The PSUs paid out during the period had a performance factor of 0% resulting in a cash disbursement of $Nil.

Earnings per Share ("EPS") and

Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS")	12 Months Ended
	Dec. 31, 2018
Profit or loss [abstract]
Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS")	21. Earnings per Share (“EPS”) and Diluted Earnings per Share (“Diluted EPS”) Diluted earnings per share is calculated using the treasury method which assumes that outstanding share purchase options and warrants, with exercise prices that are lower than the average market price of the Company’s common shares for the relevant period, are exercised and the proceeds are used to purchase shares of the Company at the average market price of the common shares for the relevant period. Diluted EPS is calculated based on the following weighted average number of shares outstanding: Years Ended December 31 (in thousands) 2018 2017 Basic weighted average number of shares outstanding 443,407 441,961 Effect of dilutive securities Share purchase options 81 197 Restricted share units 374 284 Diluted weighted average number of shares outstanding 443,862 442,442 The following table lists the number of share purchase options and share purchase warrants excluded from the computation of diluted earnings per share because the exercise prices exceeded the average market value of the common shares of Cdn$25.32, compared to Cdn$26.54 for the comparable period in 2017. Years Ended December 31 (in thousands) 2018 2017 Share purchase options 2,801 1,372 Share purchase warrants 10,000 10,000 Total 12,801 11,372

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Supplemental Cash Flow Information	22. Supplemental Cash Flow Information Change in Non-Cash Working Capital Years Ended December 31 (in thousands) 2018 2017 Change in non-cash Accounts receivable $ 828 $ (729 ) Accounts payable and accrued liabilities 7,977 (5,398 ) Other 159 (219 ) Total change in non-cash $ 8,964 $ (6,346 ) Non-Cash Transactions – Receipt of Shares as Consideration for Contract Amendments As more fully described in notes 8, 10 and 16, during 2017 the company received 3 million shares of Alexco with a fair value of $5 million and 6.8 million shares of Capstone with a fair value of $8 million. As more fully described in note 10, during 2018 the company received 20,914,590 First Majestic common shares with a fair value of $151 million as partial consideration for the termination of the previously owned San Dimas SPA. Non-Cash Transactions – Payment of Dividends Under DRIP As more fully described in Note 18.2, during the year ended December 31, 2018, the Company declared and paid dividends to its shareholders in the amount of $0.36 per common share for total dividends of $160 million. Approximately 17% of shareholders elected to have their dividends reinvested in common shares of the Company under the Company’s dividend reinvestment plan (“DRIP”). As a result, $133 million of dividend payments were made in cash and $27 million in common shares issued. For the comparable period in 2017, the Company declared and paid dividends to its shareholders in the amount of $0.33 per common share for total dividends of $146 million, with the payment being comprised of $122 million in cash and $24 million in common shares issued.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Income Taxes	23. Income Taxes A summary of the Company’s income tax expense (recovery) is as follows: Income tax recognized in net earnings is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Current income tax expense related to foreign jurisdictions $ 86 $ 326 Deferred income tax expense (recovery) related to: Origination and reversal of temporary differences $ 841 $ 3,602 Reversal of write down of previously recognized temporary differences (5,393 ) (4,814 ) Total deferred income tax recovery from operations $ (4,552 ) $ (1,212 ) Total income tax recovery from operations $ (4,466 ) $ (886 ) Income tax expense related to CRA Settlement 1 Current income tax expense related to CRA Settlement $ 4,020 $ - Reversal of previously recognized non-capital losses 3,848 - Income tax expense offset by previously unrecognized non-capital losses recognized through Equity 12,466 - Total income tax expense related to CRA Settlement 2 $ 20,334 $ - Income tax expense (recovery) recognized in net earnings $ 15,868 $ (886 ) 1) Reference to the CRA Settlement in Note 23 refers to the settlement of the 2005 to 2010 tax dispute and the application of the CRA Settlement principles to the 2011 to 2017 taxation years. Refer to the discussion on page 108 for more information. 2) Net of an $18 million tax benefit relating to non-capital losses and other deductions recognized through net earnings. Income tax recognized as a component of OCI is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Income tax expense (recovery) related to LTIs - common shares held $ 2,662 $ 1,091 Income tax expense (recovery) recognized in OCI $ 2,662 $ 1,091 Income tax recognized directly in equity is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Income tax expense (recovery) related to share issue costs Origination and reversal of temporary differences $ 1,078 $ - Write down of previously recognized temporary differences (3,001 ) (65 ) Income tax expense (recovery) from operations $ (1,923 ) $ (65 ) Income tax recovery related to CRA Settlement Benefit of previously unrecognized non-capital losses related to share issue costs $ (12,466 ) $ - Income tax expense (recovery) recognized in equity $ (14,389 ) $ (65 ) The provision for income taxes differs from the amount that would be obtained by applying the statutory income tax rate to consolidated earnings before income taxes due to the following: Years Ended December 31 (in thousands) 2018 2017 Earnings before income taxes $ 442,983 $ 56,817 Canadian federal and provincial income tax rates 1 27.00% 26.00% Income tax expense based on above rates $ 119,605 $ 14,772 Non-deductible 4,676 2,206 Differences in tax rates in foreign jurisdictions (133,361 ) (16,605 ) Impact of tax rate changes - (47 ) Impact of CRA Settlement 20,334 - Current period unrecognized temporary differences 10,007 3,602 Write down (reversal of write down) of previously recognized temporary differences (5,393 ) (4,814 ) Income tax expense (recovery) $ 15,868 $ (886 ) 1) Effective January 1, 2018, the BC corporate tax rate increased from 11% to 12%, resulting in the Company’s statutory tax rate increasing to 27% for years 2018 and beyond. The majority of the Company’s income generating activities, including the sale of precious metals, is conducted by its 100% owned subsidiary Wheaton Precious Metals International Ltd., which operates in the Cayman Islands and is not subject to income tax. The recognized deferred income tax assets and liabilities are offset on the balance sheet and relate to Canada, except for the foreign withholding tax. The movement in deferred income tax assets and liabilities for the years ended December 31, 2018 and December 31, 2017, respectively, is shown below: Year Ended December 31, 2018 Opening Recovery LTI Recovery Recovery Closing Recognized deferred income Deferred tax assets Non-capital 1 $ 3,848 $ (2,057 ) $ - $ - $ 2,032 $ 3,823 Capital loss carryforward 1,965 2,633 (4,598 ) - - - Other 2 147 240 - - - 387 Deferred tax liabilities Interest capitalized for accounting (87 ) - - - - (87 ) Debt and share financing fees 3 (375 ) (107 ) - - (109 ) (591 ) Kutcho Convertible Note (29 ) 29 - - - - Unrealized gains on long-term investments (1,937 ) 1 4,598 (2,662 ) - - Mineral stream interests 4 (3,532 ) - - - - (3,532 ) Foreign withholding tax (76 ) (35 ) - - - (111 ) Total $ (76 ) $ 704 $ - $ (2,662 ) $ 1,923 $ (111 ) 1) As at December 31, 2018, the Company had recognized the tax effect on $14 million of non-capital 2) Includes: capital assets, charitable donation carryforward, and PSU accrual. 3) Debt and share financing fees are deducted over a five year period for Canadian income tax purposes. For accounting purposes, debt financing fees are deducted over the term of the credit facility and share financing fees are charged directly to issued capital. 4) The Company’s position, as reflected in its filed Canadian income tax returns, is that the cost of the precious metal acquired under the Canadian PMPAs is equal to the market value while a deposit is outstanding (where applicable to an agreement), and the cash cost thereafter, as provided for in the PMPAs. For accounting purposes, the cost of the mineral stream interests is depleted on a unit-of-production Year Ended December 31, 2017 Opening Recovery Recovery Recovery In Closing Recognized deferred income tax assets and liabilities Deferred tax assets Non-capital $ 3,508 $ 299 $ - $ 41 $ 3,848 Capital loss carryforward 846 1,119 - - 1,965 Other 43 104 - - 147 Deferred tax liabilities Interest capitalized for accounting (84 ) (3 ) - - (87 ) Debt and share financing fees 173 (572 ) - 24 (375 ) Kutcho Convertible Note - (29 ) - - (29 ) Unrealized gains on long-term investments (846 ) - (1,091 ) - (1,937 ) Mineral stream interests (3,640 ) 108 - - (3,532 ) Foreign withholding tax (262 ) 186 - - (76 ) Total $ (262 ) $ 1,212 $ (1,091 ) $ 65 $ (76 ) Deferred income tax assets in Canada not recognized are shown below: (in thousands) December 31 December 31 Non-capital 1 $ 7,209 $ 32,388 Debt and equity financing fees 4,474 7,451 Mineral stream interests 67,717 70,514 Other 3,656 1,366 Capital loss carryforward 2 7,723 10,356 Kutcho Convertible Note 648 - Unrealized losses on long-term investments 15,907 7,828 Total $ 107,334 $ 129,903 1) As at December 31, 2018, the Company had not recognized the tax effect on $27 million of non-capital 2) As at December 31, 2018, the Company had not recognized the tax effect on $29 million of net capital losses as a deferred tax asset. At December 31, 2018, the Company has available non-capital non-capital Settlement of the Canada Revenue Agency International Tax Dispute On September 24, 2015, the Company received Notices of Reassessment (the “Reassessments”) from the CRA totaling Cdn$353 million for federal and provincial tax, transfer pricing penalties, interest and other penalties for the 2005 to 2010 taxation years. The CRA’s position in the Reassessments was that the transfer pricing provisions under the Income Tax Act (Canada) (the “Act”) relating to income earned by the Company’s foreign subsidiaries outside of Canada should apply such that the income of the Company subject to tax in Canada should be increased by an amount equal to substantially all of the income earned outside of Canada by the Company’s foreign subsidiaries for the 2005 to 2010 taxation years. On January 8, 2016, the Company commenced an appeal in the Tax Court of Canada. The Company was required to make a deposit of 50% of the reassessed amounts of tax, interest and penalties. Additional deposits were required on an annual basis for additional interest accruing. Instead of making the deposits in cash, the Company posted security in the form of letters of guarantee totaling Cdn$213 million. On December 13, 2018, the Company reached a settlement with the CRA which provides for a final resolution of the Company’s tax appeal in connection with the reassessment of the 2005 to 2010 taxation years under transfer pricing rules related to the income generated by the Company’s foreign subsidiaries outside of Canada. Under the terms of the CRA Settlement: · Income earned outside of Canada by the Company’s foreign subsidiaries will not be subject to income tax in Canada. · The service fee charged by the Company for the services provided to its foreign subsidiaries will be adjusted to: (i) include capital-raising costs incurred by the Company for the purpose of funding streaming transactions entered into by the Company’s foreign subsidiaries; and (ii) increase the mark-up · Transfer pricing penalties in the Reassessments will be reversed. Interest will be adjusted consequentially to the adjustments described above, subject to some minor adjustments. · These transfer pricing principles will also apply to all taxation years after 2010, including the 2011 to 2015 taxation years which are currently under audit, and on a go forward basis, subject to there being no material change in facts or change in law or jurisprudence. The letters of guarantee totaling Cdn$213 million posted as security for the Reassessments were cancelled on December 18, 2018. After the application of non-capital non-capital A significant component of the non-capital 5-year

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Related Party Transactions	24. Related Party Transactions Compensation of Key Management Personnel Key management personnel compensation, including directors, is as follows: Years Ended December 31 (in thousands) 2018 2017 Short-term benefits 1 $ 7,402 $ 6,836 Post-employment benefits 56 55 PSUs 2 6,001 28 Equity settled stock based compensation (a non-cash 3 3,559 3,427 Total executive compensation $ 17,018 $ 10,346 1) Short-term employee benefits include salaries, bonuses payable within twelve months of the balance sheet date and other annual employee benefits. 2) As more fully disclosed in Note 20.1, PSU compensation expense is recorded on a straight-line basis over the three year vesting period, with the expense being adjusted at the end of each reporting period to reflect (i) the fair value of common shares; (ii) the number of PSUs anticipated to vest; and (iii) the anticipated performance factor. 3) As more fully disclosed in Notes 19.2 and 19.3, equity settled stock based compensation expense is recorded on a straight-line basis over the vesting period.

Post-Employment Benefit Costs

Post-Employment Benefit Costs	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Post-Employment Benefit Costs	25. Post-Employment Benefit Costs The Company sponsors a Group Registered Retirement Savings Plan (“RRSP”) for all qualified employees. Participants in the plan can elect to contribute up to the lesser of (i) 50% of the RRSP contribution limit as established under the Income Tax Act (Canada) or (ii) 9% of their annual base salary, and the Company will match this contribution. The assets of the Group RRSP are held separately from those of the Company in independently administered funds. General and administrative expense during 2018 included $226,000 of contributions to the Group RRSP plan made by the Company, as compared to $211,000 during 2017.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Commitments and Contingencies	26. Commitments and Contingencies Mineral Stream Interests The following table summarizes the Company’s commitments to make per-ounce Mineral Stream Interests Attributable Payable Production to be Purchased Per Unit of Measurement Cash Payment 1, 2 Term of Date of Gold Silver Palladium Cobalt Gold Silver Palladium Cobalt Peñasquito 0% 25% 0% 0% n/a $ 4.21 n/a n/a Life of Mine 24-Jul-07 Constancia 50% 3 100% 0% 0% $ 400 4 $ 5.90 4 n/a n/a Life of Mine 8-Aug-12 Salobo 75% 0% 0% 0% $ 404 n/a n/a n/a Life of Mine 28-Feb-13 Sudbury 70% 0% 0% 0% $ 400 n/a n/a n/a 20 years 28-Feb-13 Antamina 0% 33.75% 0% 0% n/a variable 5 n/a n/a Life of Mine 3-Nov-15 San Dimas variable 6 0% 6 0% 0% $ 600 n/a n/a n/a Life of Mine 10-May-18 Stillwater 100% 0% 4.5% 7 0% variable 8 n/a variable 8 n/a Life of Mine 16-Jul-18 Voisey’s Bay 0% 0% 0% 42.4% 9 n/a n/a n/a variable 10 Life of Mine 11-Jun-18 Other Los Filos 0% 100% 0% 0% n/a $ 4.39 n/a n/a 25 years 15-Oct-04 Zinkgruvan 0% 100% 0% 0% n/a $ 4.39 n/a n/a Life of Mine 8-Dec-04 Yauliyacu 0% 100% 11 0% 0% n/a $ 8.85 12 n/a n/a Life of Mine 23-Mar-06 Stratoni 0% 100% 0% 0% n/a $ 6.77 13 n/a n/a Life of Mine 23-Apr-07 Neves-Corvo 0% 100% 0% 0% n/a $ 4.26 n/a n/a 50 years 5-Jun-07 Aljustrel 0% 100% 14 0% 0% n/a variable 15 n/a n/a 50 years 5-Jun-07 Minto 100% 16 100% 16 0% 0% $ 325 17 $ 4.22 n/a n/a Life of Mine 20-Nov-08 Keno Hill 0% 25% 0% 0% n/a variable 18 n/a n/a Life of Mine 2-Oct-08 Pascua-Lama 0% 25% 0% 0% n/a $ 3.90 n/a n/a Life of Mine 8-Sep-09 Rosemont 100% 100% 0% 0% $ 450 $ 3.90 n/a n/a Life of Mine 10-Feb-10 Loma de La Plata 0% 12.5% 0% 0% n/a $ 4.00 n/a n/a Life of Mine n/a 19 777 50% 100% 0% 0% $ 416 4 $ 6.14 4 n/a n/a Life of Mine 8-Aug-12 Early Deposit Toroparu 10% 50% 0% 0% $ 400 $ 3.90 n/a n/a Life of Mine 11-Nov-13 Cotabambas 25% 20 100% 20 0% 0% $ 450 $ 5.90 n/a n/a Life of Mine 21-Mar-16 Kutcho 100% 21 100% 21 0% 0% variable 22 variable 22 n/a n/a Life of Mine 12-Dec-17 1) Subject to an annual inflationary adjustment with the exception of Loma de La Plata and Sudbury. 2) All amounts are measured on a per ounce basis with the exception of cobalt which is measured on a per pound basis. Should the prevailing market price for the applicable metal be lower than this amount, the per ounce or per pound cash payment will be reduced to the prevailing market price, with the exception of Yauliyacu where the per ounce cash payment will not be reduced below $4.35 per ounce, subject to an annual inflationary factor. 3) Gold recoveries will be set at 55% for the Constancia deposit and 70% for the Pampacancha deposit until 265,000 ounces of gold have been delivered to the Company. 4) Subject to an increase to $9.90 per ounce of silver and $550 per ounce of gold after the initial 40-year 5) The Company is committed to pay Glencore 20% of the spot price of silver for each ounce of silver delivered under the Antamina PMPA. 6) Under the terms of the San Dimas PMPA, the Company is entitled to an amount equal to 25% of the payable gold production plus an additional amount of gold equal to 25% of the payable silver production converted to gold at a fixed gold to silver exchange ratio of 70:1 from the San Dimas mine. If the average gold to silver price ratio decreases to less than 50:1 or increases to more than 90:1 for a period of 6 months or more, then the “70” shall be revised to “50” or “90”, as the case may be, until such time as the average gold to silver price ratio is between 50:1 to 90:1 for a period of 6 months or more in which event the “70” shall be reinstated. 7) The Company is committed to purchase 4.5% of Stillwater palladium production until 375,000 ounces are delivered to the Company, thereafter 2.25% of Stillwater palladium production until 550,000 ounces are delivered to the Company and 1% of Stillwater palladium production thereafter for the life of mine. 8) The Company is committed to pay Sibanye 18% of the spot price of gold and palladium for each ounce of gold and palladium delivered under the Stillwater mines PMPA until the market value of gold and palladium delivered to Wheaton, net of the per ounce cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price thereafter. 9) Once the Company has received 31 million pounds of cobalt, the Company’s attributable cobalt production to be purchased will be reduced to 21.2%. 10) The Company is committed to pay Vale 18% of the spot price of cobalt per pound of cobalt delivered under the agreement until the market value of cobalt delivered to Wheaton, net of the per pound cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price thereafter. 11) Wheaton is committed to purchase from Glencore a per annum amount equal to the first 1.5 million ounces of payable silver produced at Yauliyacu and 50% of any excess. 12) Should the market price of silver exceed $20 per ounce, in addition to the $8.85 per ounce, the Company is committed to pay Glencore an additional amount for each ounce of silver delivered equal to 50% of the excess, to a maximum of $10 per ounce, such that when the market price of silver is $40 or above, the Company will pay Glencore $18.85 per ounce of silver delivered. 13) In October 2015, in order to incentivize additional exploration and potentially extend the limited remaining mine life of Stratoni, Wheaton and Eldorado Gold agreed to modify the Stratoni PMPA. The primary modification is to increase the production price per ounce of silver delivered to Wheaton over the current fixed price by one of the following amounts: (i) $2.50 per ounce of silver delivered if 10,000 meters of drilling is completed outside of the existing ore body and within Wheaton’s defined area of interest (“Expansion Drilling”); (ii) $5.00 per ounce of silver delivered if 20,000 meters of Expansion Drilling is completed; and (iii) $7.00 per ounce of silver delivered if 30,000 meters of Expansion Drilling is completed. Drilling in all three cases must be completed by December 31, 2020, in order for the agreed upon increase in production price to be initiated. The figures in the above table reflect the fact that Eldorado completed 10,000 meters of Expansion Drilling in July 2018. 14) Wheaton only has the rights to silver contained in concentrate containing less than 15% copper at the Aljustrel mine. 15) During the second quarter of 2018, the Company agreed to amend the Aljustrel PMPA with Almina to increase the production payments to 50% of the amount received under the respective concentrate sales contracts and to fix silver payable rates for a period of two years and limit rate decreases thereafter. 16) The Company is committed to acquire 100% of the first 30,000 ounces of gold produced per annum and 50% thereafter. The Minto mine was placed into care and maintenance in October 2018. 17) The production payment per ounce of gold delivered to Wheaton is to be increased over the current fixed price in periods where the market price of copper is lower than $2.50 per pound. 18) The production payment related to the Keno Hill silver interest is a function of the silver head grade and silver spot price in the month in which the silver is produced. 19) Terms of the agreement not yet finalized. 20) Once 90 million silver equivalent ounces attributable to Wheaton have been produced, the attributable production to be purchased will decrease to 66.67% of silver production and 16.67% of gold production for the life of mine. 21) Once 51,000 ounces of gold and 5.6 million ounces of silver have been delivered to Wheaton, the stream will decrease to 66.67% of gold and silver production for the life of mine. 22) The Company is committed to pay Kutcho 20% of the spot price of gold and silver for each ounce of gold and silver delivered under the Kutcho Early Deposit Agreement. Other Contractual Obligations and Contingencies Obligations With Scheduled Payment Dates (in thousands) 2019 2020 - 2022 2023 - 2024 After 2024 Sub-Total Other Commitments Total Bank debt 1 $ - $ - $ 1,264,000 $ - $ 1,264,000 $ - $ 1,264,000 Interest 2 53,845 142,169 46,541 - 242,555 - 242,555 Mineral stream interest payments 3 Rosemont 4 - - - - - 231,150 231,150 Loma de La Plata - - - - - 32,400 32,400 Toroparu - - - - - 138,000 138,000 Cotabambas 1,500 4,500 1,000 - 7,000 126,000 133,000 Kutcho - - - - - 58,000 58,000 Operating leases 789 1,696 1,076 224 3,785 - 3,785 Total contractual obligations $ 56,134 $ 148,365 $ 1,312,617 $ 224 $ 1,517,340 $ 585,550 $ 2,102,890 1) At December 31, 2018, the Company had $1.3 billion drawn and outstanding on the Revolving Facility. 2) As the applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period combined with the assumption that the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. 3) Does not reflect the contingent payment due related to the Salobo gold purchase agreement (see the Salobo section on the following page). 4) Includes contingent transaction costs of $1 million. Rosemont Effective February 8, 2019, the Company amended the Rosemont PMPA. In connection with the amended Rosemont PMPA, the Company is committed to pay Hudbay total upfront cash payments of $230 million in two installments, with the first $50 million being advanced upon Hudbay’s receipt of permitting for the Rosemont project and other customary conditions and the balance of $180 million being advanced once project costs incurred on the Rosemont project exceed $98 million. Under the amendment, the Company is now permitted to elect to pay the deposit in cash or the delivery of common shares and Hudbay has provided a corporate guarantee. Additionally, the Company will be entitled to certain delay payments, including where construction ceases in any material respect, or if completion is not achieved within agreed upon timelines. On March 8, 2019, Hudbay announced that the U.S. Army Corps of Engineers has issued a Section 404 Water Permit for the Rosemont Project and that it expects to receive the Rosemont project’s Mine Plan of Operations from the U.S. Forest Service shortly. Loma de La Plata In connection with the Loma de La Plata PMPA, the Company is committed to pay Pan American Silver Corp. (“Pan American”) total upfront cash payments of $32 million following the satisfaction of certain conditions, including Pan American receiving all necessary permits to proceed with the mine construction. Toroparu In connection with the Toroparu Early Deposit Agreement, the Company is committed to pay Sandspring an additional $138 million, payable on an installment basis to partially fund construction of the mine. Following the delivery of certain feasibility documentation or after December 31, 2019 if the feasibility documentation has not been delivered to Wheaton by such date, Wheaton may elect not to proceed with the agreement or not pay the balance of the upfront consideration and reduce the gold stream percentage from 10% to 0.909% and the silver stream percentage from 50% to nil. If Wheaton elects to terminate, Wheaton will be entitled to a return of the amounts advanced less $2 million which is non-refundable re-scoping Cotabambas In connection with the Cotabambas Early Deposit Agreement, the Company is committed to pay Panoro a total cash consideration of $140 million, of which $7 million has been paid to date. Once certain conditions have been met, the Company will advance an additional $7 million to Panoro, spread over up to five years. Following the delivery of a bankable definitive feasibility study, environmental study and impact assessment, and other related documents (collectively, the “Cotabambas Feasibility Documentation”), and receipt of permits and construction commencing, the Company may then advance the remaining deposit or elect to terminate the Cotabambas Early Deposit Agreement. If the Company elects to terminate, the Company will be entitled to a return of the portion of the amounts advanced less $2 million payable upon certain triggering events occurring. Until January 1, 2020, Panoro has a one-time Kutcho In connection with the Kutcho Early Deposit Agreement, the Company is committed to pay Kutcho a total cash consideration of $65 million, of which $7 million has been paid to date. The remaining $58 million will be advanced on an installment basis to partially fund construction of the mine once certain conditions have been satisfied. The Company will be required to make an additional payment to Kutcho, of up to $20 million, if processing throughput is increased to 4,500 tonnes per day or more within 5 years of attaining commercial production. Salobo The Salobo mine currently has a mill throughput capacity of 24 million tonnes per annum (“Mtpa”). In October 2018 Vale’s Board of Directors approved the investment in the Salobo III mine expansion (the “Salobo Expansion”). The Salobo Expansion is proposed to include a third concentrator line and will use Salobo’s existing infrastructure. Vale anticipates that the Salobo Expansion, which is scheduled to start up in the first half of 2022 with a ramp-up If actual throughput is expanded above 28 Mtpa, then under the terms of the Salobo PMPA, Wheaton will be required to make an additional set payment to Vale based on the size of the expansion, the timing of completion and the grade of the material processed. The set payment ranges from $113 million if throughput is expanded beyond 28 Mtpa by January 1, 2036 up to $953 million if throughput is expanded beyond 40 Mtpa by January 1, 2021. Based on Vale’s estimated size and timing of the Salobo Expansion, the Company estimates that an expansion payment of between $550 million to $650 million would be payable. Given Vale’s proposed schedule, this payment would likely become payable in 2023 though the actual amount and timing of the expansion payment may significantly differ from this estimate. Canada Revenue Agency – 2013 Taxation Year Domestic Reassessment and Audit On July 24, 2018, the Company received a Notice of Reassessment for the 2013 taxation year (“the 2013 Domestic Reassessment”) in which the Canada Revenue Agency (“CRA”) is seeking to change the timing of the deduction of upfront payments with respect to the Company’s PMPAs in respect of Canadian mining assets, so that the cost of precious metal acquired under these Canadian PMPAs is equal to the cash cost paid on delivery plus an amortized amount of the upfront payment determined on a units-of-production Management believes the Company’s position is correct and that it has filed its tax returns and paid applicable taxes in compliance with Canadian tax law. On October 18, 2018, Wheaton filed a notice of objection under the Act challenging the 2013 Domestic Reassessment. The 2013 Domestic Reassessment resulted in no additional tax for the 2013 taxation year after applying non-capital If CRA were to apply the 2013 Domestic Reassessment methodology to the Company’s Canadian PMPAs for the 2014 to 2018 taxation years, the Company estimates the impact, after applying the principles of the CRA Settlement, to be approximately $2 million of tax, interest and penalties. The CRA is conducting a domestic audit for the 2014 and 2015 taxation years. The 2016 to 2018 taxation years remain open to a domestic audit. U.S. Shareholder Class Action During July 2015, after the Company disclosed that the CRA was proposing that they would issue the Reassessments, two putative securities class action lawsuits were filed against the Company in the U.S. District Court for the Central District of California in connection with the proposal (the “Complaints”). On October 19, 2015, the Complaints were consolidated into one action, In re Silver Wheaton Securities Litigation At a hearing on June 6, 2016, the Court denied the Defendants’ motion to dismiss. A denial of such a motion is not a ruling on the merits of the claims in the lawsuit. Certification of the class was granted by the Court on May 11, 2017. On March 27, 2018, the court granted Plaintiff’s motion for leave to file a Second Amended Complaint, which adds a claim under Section 10(b) against our auditors. Defendants have filed motions to dismiss the Second Amended Complaint and an initial hearing was held on December 17, 2018 to consider the motions to dismiss. The court has not yet issued a ruling on the motion to dismiss. No trial date is currently set for this matter. The Company believes the allegations are without merit and intends to vigorously defend against this matter. No amounts have been recorded for any potential liability arising from this matter, as the original Complaints do not specify a quantum of damages and the Company cannot reasonably predict the outcome. Canadian Shareholder Class Action By Notice of Action dated August 10, 2016 (as amended September 2, 2016), proposed representative plaintiff Suzan Poirier commenced proceedings pursuant to the Class Proceedings Act (Ontario) in the Ontario Superior Court of Justice against Wheaton Precious Metals Corp., Randy Smallwood, President and Chief Executive Officer and Gary Brown, Senior Vice President & Chief Financial Officer. The statement of claim filed alleges, among other things, misrepresentation pursuant to primary and secondary market civil liability provisions under the Securities Act (Ontario), common law negligence and negligent misrepresentation. The claim focuses on the Reassessments. The statement of claim purports to be brought on behalf of persons who (i) acquired Wheaton common shares in Wheaton’s March 2015 public offering, and (ii) acquired Wheaton common shares in the secondary market, other than in the United States, during an alleged class period of August 14, 2013 to July 6, 2015 inclusive. The Company believes that the allegations are without merit and intends to vigorously defend against this matter. No amounts have been recorded for potential liability arising from this claim as no value has been specified in the statement of claim and the Company cannot reasonably predict the outcome. Other Due to the size, complexity and nature of the Company’s operations, various legal and tax matters are outstanding from time to time, including audits. By their nature, contingencies will only be resolved when one or more future events occur or fail to occur. The assessment of contingencies inherently involves the exercise of significant judgment and estimates of the outcome of future events. If the Company is unable to resolve any of these matters favorably, there may be a material adverse impact on the Company’s financial performance, cash flows or results of operations. In the event that management’s estimate of the future resolution of these matters changes, the Company will recognize the effects of the changes in its consolidated financial statements in the appropriate period relative to when such changes occur.

Segmented Information

Segmented Information	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Segmented Information	27. Segmented Information Operating Segments The Company’s reportable operating segments, which are the components of the Company’s business where separate financial information is available and which are evaluated on a regular basis by the Company’s Chief Executive Officer (“CEO”), who is the Company’s chief operating decision maker, for the purpose of assessing performance, are summarized in the tables below: Year Ended December 31, 2018 Sales Cost Depletion Net Cash Flow Total (in thousands) Gold Sudbury 1, 5 $ 21,785 $ 6,804 $ 13,525 $ 1,456 $ 14,959 $ 366,463 Salobo 5 336,474 106,347 102,672 127,455 230,126 2,706,060 Constancia 5 15,259 4,818 4,504 5,937 10,441 117,547 San Dimas 2 26,943 13,177 12,234 1,532 13,766 208,195 Stillwater 6,777 1,215 2,925 2,637 5,562 236,432 Other 3, 5 33,955 10,367 10,459 13,129 22,162 21,359 Total gold interests $ 441,193 $ 142,728 $ 146,319 $ 152,146 $ 297,016 $ 3,656,056 Silver San Dimas 2 $ 40,594 $ 10,549 $ 3,575 $ 26,470 $ 30,045 $ - Peñasquito 5 77,691 20,501 14,528 42,662 57,190 388,722 Antamina 5 86,408 17,265 47,561 21,582 69,143 710,077 Constancia 5 34,082 12,863 15,572 5,647 21,219 246,231 Other 4, 5 104,804 40,232 20,699 43,873 64,645 502,638 Total silver interests $ 343,579 $ 101,410 $ 101,935 $ 140,234 $ 242,242 $ 1,847,668 Palladium Stillwater $ 9,240 $ 1,656 $ 4,033 $ 3,551 $ 7,584 $ 259,693 Cobalt Voisey’s Bay $ - $ - $ - $ - $ - $ 393,422 Total mineral stream interests $ 794,012 $ 245,794 $ 252,287 $ 295,931 $ 546,842 $ 6,156,839 Other General and administrative $ (51,650 ) $ (29,509 ) Finance costs (41,187 ) (40,363 ) Other (5,826 ) 1,403 Gain on disposal of the San Dimas SPA 245,715 - Income tax expense (15,868 ) (960 ) Total other $ 131,184 $ (69,429 ) $ 313,207 Consolidated $ 427,115 $ 477,413 $ 6,470,046 1) Comprised of the operating Coleman, Copper Cliff, Garson, Creighton and Totten gold interests, the non-operating 2) On May 10, 2018, the Company terminated the San Dimas SPA and concurrently entered into the new San Dimas PMPA. 3) Where a gold interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the gold interest has been summarized under Other gold interests. Other gold interests are comprised of the operating Minto and 777 gold interests and the non-operating 4) Where a silver interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the silver interest has been summarized under Other silver interests. Other silver interests are comprised of the operating Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Neves-Corvo, Minto, Aljustrel, and 777 silver interests, the non-operating 5) As it relates to mine operator concentration risk: a. The counterparty obligations under the Salobo, Sudbury and Voisey’s Bay PMPAs are guaranteed by the parent company Vale. Total revenues relative to Vale during the year ended December 31, 2018 were 45% of the Company’s total revenue. b. The counterparty obligations under the Antamina PMPA and the Yauliyacu PMPA (which is included as part of Other silver interests) are guaranteed by the parent company Glencore plc (“Glencore”) and its subsidiary. Total revenues relative to Glencore during the year ended December 31, 2018 were 15% of the Company’s total revenue. c. The counterparty obligations under the Penasquito PMPA and the Los Filos PMPA (which is included as part of Other silver interests) are guaranteed by Goldcorp. Total revenues relative to Goldcorp during the year ended December 31, 2018 were 10% of the Company’s total revenue. d. The counterparty obligations under the Constancia PMPA and the 777 PMPA (which is included as part of Other gold and silver interests) are guaranteed by the parent company Hudbay Minerals Inc. (“Hudbay”). Total revenues relative to Hudbay during the year ended December 31, 2018 were 10% of the Company’s total revenue. Should any of these mine operators become unable or unwilling to fulfill their obligations under their agreements with the Company, there could be a material adverse impact on the Company including, but not limited to, the Company’s revenue, net income and cash flows from operations. Year Ended December 31, 2017 Sales Cost of Sales Depletion Gross Impairment 1 Net Earnings (Loss) Cash Flow Total (in thousands) Gold Sudbury 2, 6 $ 35,253 $ 11,202 $ 21,547 $ 2,504 $ - $ 2,504 $ 24,042 $ 379,988 Salobo 6 317,596 100,946 96,103 120,547 - 120,547 216,650 2,808,732 Constancia 6 11,125 3,537 3,619 3,969 - 3,969 7,575 122,051 Other 3, 6 59,967 17,480 19,415 23,072 - 23,072 38,778 31,818 Total gold interests $ 423,941 $ 133,165 $ 140,684 $ 150,092 $ - $ 150,092 $ 287,045 $ 3,342,589 Silver San Dimas 4 $ 65,677 $ 16,790 $ 5,713 $ 43,174 $ - $ 43,174 $ 48,887 $ 134,862 Peñasquito 87,906 20,856 14,827 52,223 - 52,223 67,050 403,250 Antamina 6 100,617 20,183 58,168 22,266 - 22,266 80,434 757,638 Constancia 6 33,026 11,353 14,168 7,505 - 7,505 21,470 261,803 Other 5, 6 132,048 41,454 28,820 61,774 228,680 (166,906 ) 88,495 523,135 Total silver interests $ 419,274 $ 110,636 $ 121,696 $ 186,942 $ 228,680 $ (41,738 ) $ 306,336 $ 2,080,688 Total mineral stream interests $ 843,215 $ 243,801 $ 262,380 $ 337,034 $ 228,680 $ 108,354 $ 593,381 $ 5,423,277 Corporate General and administrative $ (34,673 ) $ (30,298 ) Finance costs (30,399 ) (29,570 ) Other 13,535 5,874 Income tax recovery 886 (579 ) Total corporate $ (50,651 ) $ (54,573 ) $ 260,036 Consolidated $ 57,703 $ 538,808 $ 5,683,313 1) See Note 11 for more information. 2) Comprised of the operating Coleman, Copper Cliff, Garson, Creighton and Totten gold interests, the non-operating 3) Where a gold interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the gold interest has been summarized under Other gold interests. Other gold interests are comprised of the operating Minto and 777 gold interests and the non-operating 4) On May 10, 2018, the Company terminated the San Dimas SPA and concurrently entered into the new San Dimas PMPA. 5) Where a silver interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the silver interest has been summarized under Other silver interests. Other silver interests are comprised of the operating Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Neves-Corvo, Minto, and 777 silver interests, the non-operating 6) As it relates to mine operator concentration risk: a. The counterparty obligations under the Salobo and Sudbury PMPAs are guaranteed by the parent company Vale. Total revenues relative to Vale during the year ended December 31, 2017 were 42% of the Company’s total revenue. b. The counterparty obligations under the Antamina PMPA and the Yauliyacu PMPA (which is included as part of Other silver interests) are guaranteed by the parent company Glencore and its subsidiary. Total revenues relative to Glencore during the year ended December 31, 2017 were 16% of the Company’s total revenue. c. The counterparty obligations under the Penasquito PMPA and the Los Filos PMPA (which is included as part of Other silver interests) are guaranteed by Goldcorp. Total revenues relative to Goldcorp during the year ended December 31, 2017 were 10% of the Company’s total revenue. d. The counterparty obligations under the Constancia PMPA and the 777 PMPA (which is included as part of Other gold and silver interests) are guaranteed by the parent company Hudbay. Total revenues relative to Hudbay during the year ended December 31, 2017 were 10% of the Company’s total revenue. Should any of these mine operators become unable or unwilling to fulfill their obligations under their agreements with the Company, there could be a material adverse impact on the Company including, but not limited to, the Company’s revenue, net income and cash flows from operations. Geographical Areas The Company’s geographical information, which is based on the location of the mining operations to which the mineral stream interests relate, are summarized in the tables below: Carrying Amount at Dec 31, 2018 (in thousands) Sales: Gold Silver Palladium Cobalt Total North America Canada $ 64,589 8 % $ 387,823 $ 33,901 $ - $ 393,422 $ 815,146 13 % United States 16,018 2 % 236,432 551 259,693 - 496,676 8 % Mexico 147,274 19 % 208,194 390,079 - - 598,273 10 % Europe Greece 8,020 1 % - 5,884 - - 5,884 0 % Portugal 20,484 2 % - 22,420 - - 22,420 0 % Sweden 24,188 3 % - 37,371 - - 37,371 1 % South America Argentina/Chile 1 4,444 1 % - 264,401 - - 264,401 4 % Brazil 336,474 42 % 2,706,061 - - - 2,706,061 44 % Peru 172,521 22 % 117,546 1,093,061 - - 1,210,607 20 % Consolidated $ 794,012 100 % $ 3,656,056 $ 1,847,668 $ 259,693 $ 393,422 $ 6,156,839 100 % 1)   Includes the Pascua-Lama project, which straddles the border of Argentina and Chile.     Carrying Amount at Dec 31, 2017 (in thousands) Sales: Gold Silver Palladium Cobalt Total North America Canada $ 106,733 13 % $ 411,807 $ 36,798 $ - $ - $ 448,605 8 % United States - 0 % - 433 - - 433 0 % Mexico 162,390 19 % - 539,620 - - 539,620 10 % Europe Greece 8,756 1 % - 9,036 - - 9,036 0 % Portugal 8,616 1 % - 23,725 - - 23,725 0 % Sweden 27,569 3 % - 39,614 - - 39,614 1 % South America Argentina/Chile 1 12,041 1 % - 266,989 - - 266,989 5 % Brazil 317,597 38 % 2,808,731 - - - 2,808,731 52 % Peru 199,513 24 % 122,051 1,164,473 - - 1,286,524 24 % Consolidated $ 843,215 100 % $ 3,342,589 $ 2,080,688 $ - $ - $ 5,423,277 100 % 1) Includes the Pascua-Lama project, which straddles the border of Argentina and Chile.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Subsequent Events	28. Subsequent Events Declaration of Dividend Under the Company’s dividend policy, the quarterly dividend per common share is targeted to equal approximately 30% of the average cash flow generated by operating activities in the previous four quarters divided by the Company’s then outstanding common shares, all rounded to the nearest cent. To minimize volatility in quarterly dividends, the Company has set a minimum quarterly dividend of $0.09 per common share for the duration of 2019. The declaration, timing, amount and payment of future dividends remain at the discretion of the Board of Directors. On March 20, 2019, the Board of Directors declared a dividend in the amount of $0.09 per common share, with this dividend being payable to shareholders of record on April 5, 2019 and is expected to be distributed on or about April 18, 2019. The Company has implemented a dividend reinvestment plan (“DRIP”) whereby shareholders can elect to have dividends reinvested directly into additional Wheaton common shares at a discount of 3% of the Average Market Price, as defined in the DRIP.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
New Accounting Standards Effective in 2018	3.1. New Accounting Standards Effective in 2018 IFRS 9 – Financial Instruments (amended 2014): On January 1, 2018, the Company adopted IFRS 9 (2014) – Financial Instruments (amended 2014) (“IFRS 9 (2014)”). The Company had previously adopted IFRS 9 (2009) – Financial Instruments effective January 1, 2010. The adoption of IFRS 9 (2014) did not have a material impact on the accounting policies and methods of application relative to the Company’s financial instruments. IFRS 15 – Revenue from Contracts with Customers: On January 1, 2018, the Company adopted IFRS 15 – Revenue from Contracts with Customers (“IFRS 15”) which supersedes IAS 18 – Revenue (“IAS 18”). IFRS 15 establishes a single five-step model framework for determining the nature, amount, timing and uncertainty of revenue and cash flows arising from a contract with a customer. The standard is effective for annual periods beginning on or after January 1, 2018. IFRS 15 requires entities to recognize revenue when ‘control’ of goods or services transfers to the customer whereas the previous standard, IAS 18, required entities to recognize revenue when the ‘risks and rewards’ of the goods or services transfer to the customer. The Company concluded that there is no change in the timing of revenue recognition of its gold and silver credit sales and its gold and silver concentrate sales under IFRS 15 compared to the previous standard as the point of transfer of risks and rewards of the gold and silver and the transfer of control of the gold and silver occur at the same time. As such, no adjustment was required to the Company’s consolidated financial statements as at January 1, 2017 or for the year ended December 31, 2017. Additionally, IFRS 15 requires that variable consideration should only be recognized to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur. The Company concluded that the adjustments relating to the final assay results for the quantity of concentrate sold under the terms of the concentrate sales contracts are not significant and do not constrain the recognition of revenue.
Principles of Consolidation	3.2. Principles of Consolidation The consolidated financial statements include the accounts of the Company and its 100% owned subsidiaries Wheaton Precious Metals International Ltd., Silver Wheaton Luxembourg S.a.r.l. and Wheaton Precious Metals (Cayman) Co. Subsidiaries are fully consolidated from the date on which the Company obtains a controlling interest. Control is defined as an investor’s power over an investee with exposure, or rights, to variable returns from the investee and the ability to affect the investor’s returns through its power over the investee. Subsidiaries are included in the consolidated financial results of the Company from the effective date of acquisition up to the effective date of disposition or loss of control. The financial statements of the subsidiaries are prepared for the same reporting period as the parent company, using consistent accounting policies. Balances, transactions, income and expenses between the Company and its subsidiaries are eliminated on consolidation.
Cash and Cash Equivalents	3.3. Cash and Cash Equivalents Cash and cash equivalents include cash and highly liquid money market investments including short-term deposits, treasury bills, commercial paper, bankers’ depository notes and bankers’ acceptances with terms to maturity of less than three months.
Revenue Recognition	3.4. Revenue Recognition Revenue relating to the sale of precious metals is recognized when control of the precious metal is transferred to the customer in an amount that reflects the consideration the Company expects to receive in exchange for those products. In determining whether the Company has satisfied a performance obligation, it considers the indicators of the transfer of control, which include, but are not limited to, whether: the Company has a present right to payment; the customer has legal title to the asset; the Company has transferred physical possession of the asset to the customer; and the customer has the significant risks and rewards of ownership of the asset. Under certain PMPAs, precious metal is acquired from the mine operator in the form of gold, silver or palladium credits, which is then sold through a network of third party brokers or dealers. Revenue from precious metal credit sales is recognized at the time of the sale of such credits, which is also the date that control of the precious metal is transferred to the customer. The Company will occasionally enter into forward contracts in relation precious metal deliveries that it is highly confident will occur within a given quarter. No forward contracts were outstanding at December 31, 2018 or December 31, 2017. The sales price is fixed at the delivery date based on either the terms of these short-term forward sales contracts or the spot price of the precious metal. Under certain PMPAs, precious metal is acquired from the mine operator in concentrate form, which is then sold under the terms of the concentrate sales contracts to third-party smelters or traders. Where the Company acquires precious metals in concentrate form, final precious metal prices are set on a specified future quotational period (the “Quotational Period”) pursuant to the concentrate sales contracts with third-party smelters, typically one to three months after the shipment date, based on market prices for precious metals. The contracts, in general, provide for a provisional payment based upon provisional assays and quoted precious metal prices. Final settlement is based upon the average applicable price for the Quotational Period applied to the actual number of precious metal ounces recovered calculated using confirmed smelter weights and settlement assays. Revenues and the associated cost of sales are recorded on a gross basis under these contracts at the time title passes to the buyer, which is also the date that control of the precious metal is transferred to the customer. The Company has concluded that the adjustments relating to the final assay results for the quantity of concentrate sold and the retroactive pricing adjustment for the Quotational Period are not significant and do not constrain the recognition of revenue.
Financial Instruments	3.5. Financial Instruments In November 2009, the IASB introduced IFRS 9, Financial Instruments (“IFRS 9”), which is part of a project to replace IAS 39, Financial Instruments: Recognition and Measurement. Adoption of IFRS 9 was required by January 1, 2018, with early adoption permitted. The Company elected to adopt IFRS 9 (2009) and the related consequential amendments effective January 1, 2010. On January 1, 2018, the Company adopted IFRS 9 (2014) – Financial Instruments (amended 2014) (“IFRS 9 (2014)”). The adoption of IFRS 9 (2014) did not materially impact the accounting policies and methods of application relative to the Company’s financial instruments. Financial assets and financial liabilities are recognized when the Company becomes a party to the contractual provisions of the instrument. Financial assets and financial liabilities are initially measured at fair value. Transaction costs that are directly attributable to the acquisition or issue of financial assets and financial liabilities (other than financial assets and financial liabilities at fair value through net earnings) are added to or deducted from the fair value of the financial assets or financial liabilities, as appropriate, on initial recognition. Transaction costs directly attributable to the acquisition of financial assets or financial liabilities at fair value through net earnings are recognized immediately in net earnings.
Financial Assets	3.6. Financial Assets Financial assets are subsequently measured at either amortized cost or fair value, depending on the classification of the financial assets. Financial Assets at Fair Value Through Other Comprehensive Income (“FVTOCI”) The Company’s long-term investments in common shares held are for long-term strategic purposes and not for trading. Upon the adoption of IFRS 9, the Company made an irrevocable election to designate these long-term investments in common shares held as FVTOCI as it believes that this provides a more meaningful presentation for long-term strategic investments, rather than reflecting changes in fair value in net earnings. Long-term investments in common shares held are initially measured at fair value. Subsequently, they are measured at fair value with gains and losses arising from changes in fair value recognized as a component of other comprehensive income (“OCI”) and accumulated in the long-term investment revaluation reserve. The cumulative gain or loss will not be reclassified to net earnings on disposal of these long-term investments but is reclassified to retained earnings. Dividends on these long-term investments in common shares held are recognized as a component of net earnings in the period they are received under the classification Other (Income) Expense. Financial Assets at Fair Value Through Net Earnings (“FVTNE”) Cash and cash equivalents are stated at FVTNE. Warrants held by the Company for long-term investment purposes are classified as FVTNE. These warrants are measured at fair value at the end of each reporting period, with any gains or losses arising on remeasurement recognized as a component of net earnings under the classification Other (Income) Expense. The Kutcho Convertible Note receivable (Note 15) is classified as FVTNE and is measured at fair value at the end of each reporting period by discounting the stream of future interest and principal payments at the rate of interest prevailing at the balance sheet date for instruments of similar term and risk (the market interest rate), and adding this value to the value of the convertibility feature which is estimated using a Black-Scholes model based on assumptions including risk free interest rate, expected dividend yield, expected volatility and expected remaining life of the Kutcho Convertible Note receivable. The resulting gains or losses (if any) arising on remeasurement is recognized as a component of net earnings under the classification Other (Income) Expense. As discussed in Note 3.4, the Company’s provisionally priced sales contain an embedded derivative that is reflected at fair value at the end of each reporting period. Fair value gains and losses related to the embedded derivative are included in revenue in the period they occur. Financial Assets at Amortized Cost Other receivables are non-interest Foreign Exchange Gains and Losses The fair value of financial assets denominated in a foreign currency is determined in that foreign currency and translated at the spot rate at the end of each reporting period. The foreign exchange component forms part of its fair value gain or loss. Therefore, · For financial assets that are classified as FVTNE, the foreign exchange component is recognized as a component of net earnings; · For financial assets that are classified as FVTOCI, the foreign exchange component is recognized as a component of OCI; and · For financial assets that are denominated in a foreign currency and are measured at amortized cost at the end of each reporting period, the foreign exchange gains and losses are determined based on the amortized cost of the instruments and are recognized as a component of net earnings. Derecognition of Financial Assets The Company derecognizes a financial asset only when the contractual rights to cash flows from the asset expire, or when it transfers the financial asset and substantially all the risks and rewards of ownership of the asset to another entity. If the Company neither transfers nor retains substantially all the risks and rewards of ownership and continues to control the transferred asset, the Company recognizes its retained interest in the asset and an associated liability for amounts it may have to pay. If the Company retains substantially all the risks and rewards of ownership of a transferred financial asset, the Company continues to recognize the financial asset and also recognizes a collateralized borrowing for the proceeds received. On derecognition of a financial asset that is classified as FVTOCI, the cumulative gain or loss (net of tax) previously accumulated in the long-term investment revaluation reserve is not reclassified to net earnings, but is reclassified to retained earnings.
Financial Liabilities and Equity Instruments	3.7. Financial Liabilities and Equity Instruments Debt and equity instruments issued by the Company are classified as either financial liabilities or as equity in accordance with the substance of the contractual arrangements and the definition of a financial liability and equity instrument. All financial liabilities are subsequently measured at amortized cost using the effective interest method or at FVTNE, depending on the classification of the instrument. Equity Instruments An equity instrument is a contract that evidences a residual interest in the assets of an entity after deducting all of its liabilities. Equity instruments issued by the Company are recognized at the proceeds received less direct issue costs (net of any current or deferred income tax recovery attributable to such costs). Share Purchase Warrants Issued Share purchase warrants issued with an exercise price denominated in the Company’s functional currency (US dollars) are considered equity instruments with the consideration received reflected within shareholders’ equity under the classification of share purchase warrants reserve. Upon exercise, the original consideration is reallocated from share purchase warrants reserve to issued share capital along with the associated exercise price. Bank Debt Bank debt is initially measured at fair value, net of transaction costs, and is subsequently measured at amortized cost using the effective interest method. The effective interest method is a method of calculating the amortized cost of a financial liability and of allocating interest expense over the relevant period. The effective interest rate is the rate that exactly discounts estimated future cash payments through the expected life of the financial liability, or (where appropriate) a shorter period, to the net carrying amount on initial recognition. Other Financial Liabilities Accounts payable and accrued liabilities are stated at amortized cost, which approximate fair values due to the short terms to maturity. Foreign Exchange Gains and Losses The fair value of financial liabilities denominated in a foreign currency is determined in that foreign currency and translated at the spot rate at the end of each reporting period. Therefore, · For financial liabilities that are denominated in a foreign currency and are measured at amortized cost at the end of each reporting period, the foreign exchange gains and losses are determined based on the amortized cost of the instruments and are recognized as a component of net earnings; and · For financial liabilities that are classified as FVTNE, the foreign exchange component forms part of the fair value gains or losses and is recognized as a component of net earnings. Derecognition of Financial Liabilities The Company derecognizes financial liabilities when the Company’s obligations are discharged, cancelled or they expire. The difference between the carrying amount of the financial liability derecognized and the consideration paid and payable, including any non-cash
Mineral Stream Interests	3.8. Mineral Stream Interests Agreements for which settlement is called for in gold, silver, palladium or cobalt, the amount of which is based on production at the mines, are stated at cost less accumulated depletion and accumulated impairment charges, if any. The cost of the asset is comprised of its purchase price, any closing costs directly attributable to acquiring the asset, and, for qualifying assets, borrowing costs. The purchase price is the aggregate cash amount paid and the fair value of any other non-cash Depletion The cost of these mineral stream interests is separately allocated to reserves, resources and exploration potential. The value allocated to reserves is classified as depletable and is depleted on a unit-of-production non-depletable Asset Impairment Management considers each PMPA to be a separate cash generating unit (“CGU”), which is the lowest level for which cash inflows are largely independent of those of other assets. At the end of each reporting period, the Company assesses each PMPA to determine whether any indication of impairment exists. If such an indication exists, the recoverable amount of the PMPA is estimated in order to determine the extent of the impairment (if any). The recoverable amount of each PMPA is the higher of fair value less cost of disposal (“FVLCD”) and value in use (“VIU”). In determining the recoverable amounts of each of the Company’s CGU’s, the Company uses the FVLCD as this will generally be greater than or equal to the VIU. To determine the FVLCD that could be received from each PMPA in an arm’s length transaction at the measurement date, the Company estimates a range of potential values using the net asset value (“NAV”) methodology and the net present value (“NPV”) methodology (as described below), and then selects a value within this range which is the most representative of the estimated recoverable amount of the stream. NAV is estimated by using an appropriate discount rate to calculate the present value of the expected future cash flows associated with each mineral category. The values are adjusted for each mineral category dependent on the likelihood of conversion from resources to reserves. A market multiple is applied to the NAV computed in order to assess the estimated fair value. Precious metal companies typically trade at a market capitalization that is based on a multiple of their underlying NAV, with this market multiple being generally understood to take account of a variety of additional value and risk factors such as the ability to find and produce more metal than what is currently included in the life of mine plan, the benefit of precious metal price optionality, the potential remaining mine life and adjustments for relative mine and country risk. Consequently, a market participant would generally apply a NAV multiple when estimating the fair value of a precious metal interest. NPV is estimated by using a nominal discount rate to calculate the present value of expected future cash flows. The expected future cash flows are management’s best estimates of expected future revenues and costs. Under each valuation methodology, expected future revenues reflect an estimate of future payable production for each mine at which the Company has a PMPA based on detailed life of mine plans received from each of the partners. Expected future revenues also reflect management’s estimated long-term metal prices. Estimated future cash costs are generally fixed based on the terms of each PMPA as disclosed in Note 26. If the carrying amount of the PMPA exceeds its recoverable amount, the PMPA is considered impaired and an impairment charge is reflected as a component of net earnings so as to reduce the carrying amount to its recoverable value. A previously recognized impairment charge is reversed only if there has been an indicator of a potential impairment reversal and the resulting assessment of the PMPA’s recoverable amount exceeds its carrying value. If this is the case, the carrying amount of the PMPA is increased to its recoverable amount. The increased amount cannot exceed the carrying amount that would have been determined, net of depletion, had no impairment charge been recognized for the PMPA in prior years. Such reversal is reflected as a component of net earnings.
Investments in Associates	3.9. Investments in Associates Investments over which the Company exercises significant influence and that the Company does not control or jointly control are associates. Investments in associates are accounted for using the equity method, except when classified as held for sale. The equity method involves recording the initial investment at cost and subsequently adjusting the carrying value of the investment for the Company’s proportionate share of the profit or loss, other comprehensive income or loss and any other changes in the associate’s net assets such as dividends. The Company’s proportionate share of the associate’s profit or loss and other comprehensive income or loss is based on its most recent publicly available financial statements. Adjustments are made to align any inconsistencies between the Company’s accounting policies and the associate’s policies before applying the equity method. Adjustments are also made to account for depreciable assets based on their fair values at the acquisition date of the investment and for any impairment losses recognized by the associate. If the Company’s share of the associate’s losses equals or exceeds the Company’s investment in the associate, recognition of further losses is discontinued. After the Company’s interest is reduced to zero, additional losses will be provided for and a liability recognized only to the extent that the Company has incurred legal or constructive obligations to provide additional funding or make payments on behalf of the associate. If the associate subsequently reports profits, the Company resumes recognizing the Company’s share of those profits only after the Company’s share of the profits equals the Company’s share of losses not recognized. At each balance sheet date, management considers whether there is objective evidence of impairment in associates. If there is such evidence, management determines the amount of impairment to record, if any, in relation to the associate.
Borrowing and Debt Issue Costs	3.10. Borrowing and Debt Issue Costs Borrowing costs allocable to qualifying assets, which are assets that necessarily take a substantial period of preparation for their intended use, are capitalized and included in the carrying amounts of the related assets until such time as the assets are substantially ready for their intended use. Borrowing costs that do not relate to the acquisition or construction of qualifying assets are reflected as a component of net earnings under the classification Finance Costs, as incurred. For the purposes of determining whether borrowing costs are allocable to qualifying assets, general borrowings are first considered to relate to qualifying assets to the extent of the cumulative investment made by the Company. Debt issue costs on non-revolving
Stock Based Payment Transactions	3.11. Stock Based Payment Transactions The Company recognizes a stock based compensation expense for all share purchase options and restricted share units (“RSUs”) awarded to employees, officers and directors based on the fair values of the share purchase options and RSUs at the date of grant. The fair values of share purchase options and RSUs at the date of grant are expensed over the vesting periods of the share purchase options and RSUs, respectively, with a corresponding increase to equity. The fair value of share purchase options is determined using the Black-Scholes option pricing model with market related inputs as of the date of grant. Share purchase options with graded vesting schedules are accounted for as separate grants with different vesting periods and fair values. The fair value of RSUs is the market value of the underlying shares at the date of grant. At the end of each reporting period, the Company re-assesses The Company recognizes a stock based compensation expense for performance share units (“PSUs”) which are awarded to eligible employees and are settled in cash. Compensation expense for the PSUs is recorded on a straight-line basis over the three year vesting period. This estimated expense is reflected as a component of net earnings over the vesting period of the PSUs with the related obligation recorded as a liability on the balance sheet. The amount of compensation expense is adjusted at the end of each reporting period to reflect (i) the fair market value of common shares; (ii) the number of PSUs anticipated to vest; and (iii) the anticipated performance factor.
Income Taxes	3.12. Income Taxes Income tax expense comprises current and deferred income tax. Current and deferred income taxes are recognized as a component of net earnings except to the extent that it relates to items recognized directly in equity or as a component of OCI. Current income tax is the expected tax payable on the taxable income for the year, using tax rates enacted or substantively enacted at the end of the reporting period, and any adjustment to tax payable in respect of previous years. Deferred income tax is recognized using the liability method on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. Deferred income tax assets and liabilities are measured using tax rates and laws that have been enacted or substantively enacted at the end of the reporting period and which are expected to apply when the related deferred income tax assets are realized or the deferred income tax liabilities are settled. Deferred income tax liabilities are generally recognized for all taxable temporary differences. Deferred income tax assets are generally recognized for all deductible temporary differences and the carry forward of unused tax losses and tax credits to the extent that it is probable that reversing taxable temporary differences or sufficient taxable income will be available against which those deductible temporary differences and the carry forward of unused tax losses and tax credits can be utilized. Deferred income tax liabilities are recognized for taxable temporary differences arising on investments in subsidiaries except where the reversal of the temporary difference can be controlled and it is probable that the difference will not reverse in the foreseeable future. Deferred income tax assets arising from deductible temporary differences associated with such investments are only recognized to the extent that it is probable that there will be sufficient taxable income against which to utilize the benefits of the temporary differences and they are expected to reverse in the foreseeable future. The carrying amount of deferred income tax assets are reviewed at the end of each reporting period and reduced to the extent that it is no longer probable that reversing taxable temporary differences or sufficient taxable income will be available to allow all or part of the deferred income tax assets to be recovered. Deferred income tax assets and liabilities are not recognized for temporary differences arising from the initial recognition (other than in a business combination) of assets and liabilities in a transaction which does not affect either the accounting income or the taxable income. In addition, deferred income tax liabilities are not recognized if the temporary difference arises from the initial recognition of goodwill.
Earnings Per Share	3.13. Earnings Per Share Earnings per share calculations are based on the weighted average number of common shares and common share equivalents issued and outstanding during the year. Diluted earnings per share is calculated using the treasury method which requires the calculation of diluted earnings per share by assuming that outstanding share purchase options and warrants with an exercise price that exceeds the average market price of the common shares for the period are exercised, and the proceeds are used to repurchase shares of the Company at the average market price of the common shares for the period.
Foreign Currency Translation	3.14. Foreign Currency Translation The functional currency is the currency of the primary economic environment in which an entity operates. The consolidated financial statements are presented in US dollars, which is the functional currency of the Company and its subsidiaries. Foreign currency monetary assets and liabilities are translated into US dollars at the exchange rates prevailing at the balance sheet date. Non-monetary
Leasing	3.15. Leasing Leases are classified as finance leases whenever the terms of the lease transfer substantially all of the risks and rewards of ownership to the lessee. All other leases are classified as operating leases. At December 31, 2018 and December 31, 2017, the Company was not a party to any finance leases. The Company as the Lessee Operating lease payments are recognized on a straight-line basis over the term of the lease, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased assets are consumed. In the event that lease incentives are received to enter into operating leases, such incentives are recognized as a liability. The aggregate benefit of incentives is recognized as a reduction to rental expense on a straight-line basis over the term of the lease, except where another systematic basis is more representative of the time pattern in which economic benefits from the leased assets are consumed.
Provisions	3.16. Provisions Provisions are recognized when the Company has a present obligation (legal or constructive) as a result of a past event, it is probable that the Company will be required to settle the obligation, and a reliable estimate can be made of the amount required to settle the obligation. The amount recognized as a provision is the best estimate of the consideration required to settle the present obligation at the end of the reporting period, taking into account the risks and uncertainties surrounding the obligation. Where a provision is measured using the cash flows estimated to settle the present obligation, its carrying amount is the present value of those cash flows. When some or all of the economic benefits required to settle a provision are expected to be recovered from a third party, a receivable is recognized as an asset if it is virtually certain that reimbursement will be received and the amount of the receivable can be measured reliably.
Future Changes in Accounting Policies	3.17. Future Changes in Accounting Policies The IASB has issued the following new or amended standards: Standards required to be applied for periods beginning on or after January 1, 2019: · IFRS 16 – Leases: In January 2016, the IASB and the FASB completed its joint project to address concerns by users of financial statements in respect of reduced comparability between financial statements due to the different accounting treatment applied to operating leases as compared to finance leases by removing the distinction between operating leases and finance leases and rather having all leases accounted for as a finance lease, subject to limited exceptions for short-term leases and leases of low value assets. The Company is currently evaluating the impact of this standard and anticipates that upon adoption of this standard, its leases will be capitalized under the classification Right-of-Use · IFRIC 23 – Uncertainty over Income Tax Treatments: In June 2017, the IASB issued IFRIC 23 which is effective for periods beginning on or after January 1, 2019. IFRIC 23 provides guidance on the accounting for current and deferred tax liabilities and assets in circumstances in which there is uncertainty over income tax treatments. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Statement of Earnings. Early adoption of the above standards is permitted.

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Classification of Financial Assets and Liabilities	The following table summarizes the classification of the Company’s financial assets and liabilities: Note December 31 December 31 (in thousands) 2018 2017 Financial assets Financial assets mandatorily measured at FVTNE Cash and cash equivalents $ 75,767 $ 98,521 Trade receivables from provisional concentrate sales, net of fair value adjustment 6, 9 1,332 1,398 Long-term investments - warrants held 16 - 124 Convertible note receivable 15 12,899 15,777 Investments in equity instruments designated as at FVTOCI Long-term investments - common shares held 16 164,753 95,608 Financial assets measured at amortized cost Other accounts receivable 9 1,064 1,796 Total financial assets $ 255,815 $ 213,224 Financial liabilities Financial liabilities at amortized cost Accounts payable and accrued liabilities 19,883 12,118 Bank debt 17 1,264,000 770,000 Total financial liabilities $ 1,283,883 $ 782,118
Maximum Exposure to Credit Risk Related to Financial Assets	The Company’s maximum exposure to credit risk related to its financial assets is as follows: December 31 December 31 (in thousands) Note 2018 2017 Cash and cash equivalents $ 75,767 $ 98,521 Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,332 1,398 Other accounts receivables 9 1,064 1,796 Convertible note receivable 15 12,899 15,777 Maximum exposure to credit risk related to financial assets $ 91,062 $ 117,492
Timing Associated with Remaining Contractual Payments Relating to Financial Liabilities	The table includes both interest and principal cash flows. To the extent that applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period. As at December 31, 2018 (in thousands) 2019 2020 2021 2022 2023 Total Non-derivative Bank debt ¹ $ - $ - $ - $ - $ 1,264,000 $ 1,264,000 Interest on bank debt ² 53,845 50,021 46,564 45,584 46,541 242,555 Accounts payable and accrued liabilities 19,883 - - - - 19,883 Performance share units 3 5,578 3,890 1,288 - - 10,756 Total $ 79,306 $ 53,911 $ 47,852 $ 45,584 $ 1,310,541 $ 1,537,194 1) Assumes the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. On February 27, 2019, the term of the revolving credit facility was extended by an additional year, with the facility now maturing on February 27, 2024. 2) As the applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period combined with the assumption that the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. 3) Assumes a weighted average performance factor of 141% (see Note 20.1).
Summary of Carrying Amounts of Canadian Dollar Denominated Monetary Assets and Monetary Liabilities	The carrying amounts of the Company’s Canadian dollar denominated monetary assets and monetary liabilities at the end of the reporting period are as follows: December 31 December 31 (in thousands) 2018 2017 Monetary assets Cash and cash equivalents $ 731 $ 453 Accounts receivable 637 71 Long-term investments - common shares held 161,421 90,003 Long-term investments - warrants held - 124 Convertible note receivable 12,899 15,777 Other long-term assets 1,105 717 Total Canadian dollar denominated monetary assets $ 176,793 $ 107,145 Monetary liabilities Accounts payable and accrued liabilities $ 16,128 $ 5,542 Current taxes payable 3,361 - Performance share units 8,808 1,165 Total Canadian dollar denominated monetary liabilities $ 28,297 $ 6,707
Summary of Sensitivity to 10% Increase or Decrease in Canadian Dollar	The following tables detail the Company’s sensitivity to a 10% increase or decrease in the Canadian dollar relative to the United States dollar, representing the sensitivity used when reporting foreign currency risk internally to key management personnel and represents management’s assessment of the reasonably possible change in exchange rates. As at December 31, 2018 Change in Canadian Dollar (in thousands) 10% Increase 10% Decrease Increase (decrease) in net earnings $ (1,292 ) $ 1,292 Increase (decrease) in other comprehensive income 16,142 (16,142 ) Increase (decrease) in total comprehensive income $ 14,850 $ (14,850 ) As at December 31, 2017 Change in Canadian Dollar (in thousands) 10% 10% Increase (decrease) in net earnings $ 1,043 $ (1,043) Increase (decrease) in other comprehensive income 9,000 (9,000) Increase (decrease) in total comprehensive income $ 10,043 $ (10,043)
Summary of Financial Assets and Liabilities Measured at Fair Value by Level within Fair Value Hierarchy	The following table sets forth the Company’s financial assets and liabilities measured at fair value by level within the fair value hierarchy. As required by IFRS 13, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. December 31, 2018 (in thousands) Note Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 75,767 $ 75,767 $ - $ - Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,332 - 1,332 - Long-term investments - common shares held 16 164,753 164,753 - - Long-term investments - warrants held 16 - - - - Convertible note receivable 15 12,899 - - 12,899 $ 254,751 $ 240,520 $ 1,332 $ 12,899 December 31, 2017 (in thousands) Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 98,521 $ 98,521 $ - $ - Trade receivables from provisional concentrate sales, net of fair value adjustment 9 1,398 - 1,398 - Long-term investments - common shares held 16 95,608 95,608 - - Long-term investments - warrants held 16 124 - 124 - Convertible note receivable (Note 15) 15 15,777 - - 15,777 $ 211,428 $ 194,129 $ 1,522 $ 15,777

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Revenue	Years Ended December 31 (in thousands) 2018 2017 Sales Gold Gold credit sales $ 431,618 54 % $ 394,809 47% Concentrate sales 9,575 1 % 29,132 3% $ 441,193 55 % $ 423,941 50% Silver Silver credit sales $ 290,152 37 % $ 365,251 43% Concentrate sales 53,427 7 % 54,023 7% $ 343,579 44 % $ 419,274 50% Palladium Palladium credit sales $ 9,240 1 % $ - 0% Total sales revenue $ 794,012 100 % $ 843,215 100%

General and Administrative (Tab

General and Administrative (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of General and Administrative Expense	Years Ended December 31 (in thousands) Note 2018 2017 Salaries and benefits Salaries and benefits, excluding PSUs $ 14,397 $ 12,054 PSUs 1 20.1 9,517 140 Total salaries and benefits $ 23,914 $ 12,194 Depreciation 1,057 972 Donations 2,610 2,141 Professional fees 8,559 3,938 Other 10,078 10,377 General and administrative before equity settled stock based compensation $ 46,218 $ 29,622 Equity settled stock based compensation 2 Stock options 19.2 $ 2,401 $ 3,037 RSUs 19.3 3,031 2,014 Total equity settled stock based compensation $ 5,432 $ 5,051 Total general and administrative $ 51,650 $ 34,673 1) The PSU accrual related to the anticipated fair value of the PSUs issued uses a weighted average performance factor of 141% during the year ended December 31, 2018 as compared to 17% during the comparable period of 2017. 2) Equity settled stock based compensation is a non-cash

Other (Income) Expense (Tables)

Other (Income) Expense (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Other (Income) Expense	Years Ended December 31 (in thousands) Note 2018 2017 Interest income $ (750 ) $ (407 ) Dividends received from equity investments designated as FVTOCI relating to investments held at the end of the reporting period 16 (78 ) (60 ) Proceeds relative to the Mercator Minerals bankruptcy - (1,022 ) Guarantee fees - Primero Revolving Credit Facility (858 ) (2,683 ) Fees for contract amendments and reconciliations (248 ) (9,424 ) Share of losses of associate 14 432 - Foreign exchange (gain) loss (144 ) 270 Interest and penalties related to CRA Settlement 1 23 4,317 - Net gain/(loss) arising on financial assets mandatorily measured at FVTPL Loss on fair value adjustment of share purchase warrants held 16 124 6 Loss on fair value adjustment of Kutcho Convertible Note 15 2,878 (215 ) Other 153 - Total other (income) expense $ 5,826 $ (13,535 ) 1) Reference to the CRA Settlement refers to the settlement of the 2005 to 2010 tax dispute and the application of the CRA Settlement principles to the 2011 to 2017 taxation years. Refer to the discussion on page 108 for more information.

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Accounts Receivable	December 31 December 31 (in thousands) Note 2018 2017 Trade receivables from provisional concentrate sales, net of fair value adjustment 6 $ 1,332 $ 1,398 Other accounts receivables 1,064 1,796 Total accounts receivable $ 2,396 $ 3,194

Mineral Stream Interests (Table

Mineral Stream Interests (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Mineral Stream Interests	Year Ended December 31, 2018 Cost Accumulated Depletion & Impairment 1 Carrying (in thousands) Balance Additions Disposal Balance Balance Depletion Disposal Balance Gold interests Sudbury 2 $ 623,864 $ - - $ 623,864 $ (243,876 ) $ (13,525 ) - $ (257,401 ) $ 366,463 Salobo 3,059,876 - - 3,059,876 (251,144 ) (102,672 ) - (353,816 ) 2,706,060 Constancia 136,058 - - 136,058 (14,007 ) (4,504 ) - (18,511 ) 117,547 San Dimas - 220,429 - 220,429 - (12,234 ) - (12,234 ) 208,195 Stillwater - 239,357 - 239,357 - (2,925 ) - (2,925 ) 236,432 Other 3 402,232 - - 402,232 (370,414 ) (10,459 ) - (380,873 ) 21,359 $ 4,222,030 $ 459,786 $ - $ 4,681,816 $ (879,441 ) $ (146,319 ) $ - $ (1,025,760 ) $ 3,656,056 Silver interests San Dimas $ 190,331 $ - $ (190,331 ) $ - $ (55,469 ) $ (3,575 ) $ 59,044 $ - $ - Peñasquito 524,626 - - 524,626 (121,376 ) (14,528 ) - (135,904 ) 388,722 Antamina 900,343 - - 900,343 (142,705 ) (47,561 ) - (190,266 ) 710,077 Constancia 302,948 - - 302,948 (41,145 ) (15,572 ) - (56,717 ) 246,231 Other 4 1,282,837 202 - 1,283,039 (759,702 ) (20,699 ) - (780,401 ) 502,638 $ 3,201,085 $ 202 $ (190,331 ) $ 3,010,956 $ (1,120,397 ) $ (101,935 ) $ 59,044 $ (1,163,288 ) $ 1,847,668 Palladium interests Stillwater $ - $ 263,726 - $ 263,726 $ - $ (4,033 ) - $ (4,033 ) $ 259,693 Cobalt interests Voisey’s Bay $ - $ 393,422 - $ 393,422 $ - $ - - $ - $ 393,422 $ 7,423,115 $ 1,117,136 $ (190,331 ) $ 8,349,920 $ (1,999,838 ) $ (252,287 ) $ 59,044 $ (2,193,081 ) $ 6,156,839 1) Includes cumulative impairment charges to December 31, 2018 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $338 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million. 2) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 3) Comprised of the Minto, Rosemont and 777 gold interests. 4) Comprised of the currently owned Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Rosemont and 777 silver interests in addition to the Lagunas Norte, Pierina and Veladero silver interests, all of which expired on March 31, 2018. Year Ended December 31, 2017 Cost Accumulated Depletion & Impairment 1 Carrying (in thousands) Balance Reductions² Disposal³ Balance 2017 Balance Depletion Disposal³ Impairment Balance Gold interests Sudbury 4 $ 623,864 $ - $ - $ 623,864 $ (222,329 ) $ (21,547 ) $ - $ - $ (243,876 ) $ 379,988 Salobo 3,059,876 - - 3,059,876 (155,041 ) (96,103 ) - - (251,144 ) 2,808,732 Constancia 136,058 - - 136,058 (10,388 ) (3,619 ) - - (14,007 ) 122,051 Other 5 402,232 - - 402,232 (350,999 ) (19,415 ) - - (370,414 ) 31,818 $ 4,222,030 $ - $ - $ 4,222,030 $ (738,757 ) $ (140,684 ) $ - $ - $ (879,441 ) $ 3,342,589 Silver interests San Dimas $ 190,331 $ - $ - $ 190,331 $ (49,756 ) $ (5,713 ) $ - $ - $ (55,469 ) $ 134,862 Peñasquito 524,626 - - 524,626 (106,549 ) (14,827 ) - - (121,376 ) 403,250 Antamina 900,343 - - 900,343 (84,537 ) (58,168 ) - - (142,705 ) 757,638 Constancia 302,948 - - 302,948 (26,977 ) (14,168 ) - - (41,145 ) 261,803 Other 3 1,329,731 (4,935 ) (41,959 ) 1,282,837 (544,161 ) (28,820 ) 41,959 (228,680 ) (759,702 ) 523,135 $ 3,247,979 $ (4,935 ) $ (41,959 ) $ 3,201,085 $ (811,980 ) $ (121,696 ) $ 41,959 $ (228,680 ) $ (1,120,397 ) $ 2,080,688 $ 7,470,009 $ (4,935 ) $ (41,959 ) $ 7,423,115 $ (1,550,737) $ (262,380) $ 41,959 $ (228,680) $ (1,999,838) $ 5,423,277 1) Includes cumulative impairment charges to December 31, 2017 as follows: Keno Hill silver interest - $11 million; Pascua-Lama silver interest - $338 million; 777 silver interest - $64 million; 777 gold interest - $151 million; and Sudbury gold interest - $120 million. 2) On March 29, 2017, the Company amended its PMPA with Alexco Resource Corp. (“Alexco”) to adjust the silver production payment so that it will be a percentage of the spot silver price that increases with lower mill silver head grades and lower silver prices, and decreases with higher mill silver head grades and higher silver prices, subject to certain ceiling and floor grades and prices. In addition, the outside completion date was extended to December 31, 2019 and the area of interest was expanded to include properties currently owned by Alexco and properties acquired by Alexco in the future which fall within a one kilometer radius of existing Alexco holdings in the Keno Hill Silver District. As consideration, on April 10, 2017, Alexco issued 3 million shares to Wheaton which had a fair value of $5 million. The fair value of these shares have been reflected as a reduction to the cost base of the Keno Hill silver interest. 3) Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests. The Cozamin PMPA expired on April 4, 2017 and the fully depleted value of this contract has been reflected as a disposal. 4) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 5) Comprised of the Minto, Rosemont and 777 gold interests.
Classification of Mining Interest Between Depletable and Non-depletable	December 31, 2018 December 31, 2017 (in thousands) Depletable Non- Depletable Total Depletable Non- Depletable Total Gold interests Sudbury 1 $ 308,041 $ 58,422 $ 366,463 $ 315,421 $ 64,567 $ 379,988 Salobo 2,171,292 534,768 2,706,060 2,224,133 584,599 2,808,732 Constancia 108,403 9,144 117,547 112,432 9,619 122,051 San Dimas 101,421 106,774 208,195 - - - Stillwater 209,569 26,863 236,432 - - - Other 2 21,359 - 21,359 31,818 - 31,818 $ 2,920,085 $ 735,971 $ 3,656,056 $ 2,683,804 $ 658,785 $ 3,342,589 Silver interests San Dimas $ - $ - $ - $ 38,110 $ 96,752 $ 134,862 Peñasquito 284,194 104,528 388,722 293,968 109,282 403,250 Antamina 353,679 356,398 710,077 380,738 376,900 757,638 Constancia 230,983 15,248 246,231 240,950 20,853 261,803 Other 3 87,386 415,252 502,638 90,366 432,769 523,135 $ 956,242 $ 891,426 $ 1,847,668 $ 1,044,132 $ 1,036,556 $ 2,080,688 Palladium interests Stillwater $ 248,299 $ 11,394 $ 259,693 $ - $ - $ - Cobalt interests Voisey’s Bay $ - $ 393,422 $ 393,422 $ - $ - $ - $ 4,124,626 $ 2,032,213 $ 6,156,839 $ 3,727,936 $ 1,695,341 $ 5,423,277 1) Comprised of the Coleman, Copper Cliff, Garson, Stobie, Creighton, Totten and Victor gold interests. 2) Comprised of the Minto, Rosemont and 777 gold interests. 3) Comprised of the Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Keno Hill, Cozamin, Neves-Corvo, Minto, Aljustrel, Loma de La Plata, Pascua-Lama, Lagunas Norte, Pierina, Veladero, Rosemont and 777 silver interests. The Cozamin PMPA expired on April 4, 2017 while the Lagunas Norte, Pierina and Veladero silver interests expired on March 31, 2018.
Disclosure of Gain on Disposal of Mineral Stream Interest	(in thousands) Cash received $ 220,000 Fair value of First Majestic shares received 151,000 Fee from Goldcorp in exchange for release from the 10,000 Total net proceeds from the disposal of the San Dimas SPA $ 381,000 Less: carrying value plus closing costs (135,285 ) Gain on disposal of the San Dimas SPA $ 245,715

Impairment of Mineral Stream _2

Impairment of Mineral Stream Interests (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Impairment of Mineral Stream Interests	Years Ended December 31 (in thousands) 2018 Silver interests Other silver interests Pascua-Lama $ - $ 228,680 Total impairment charges $ - $ 228,680

Early Deposit Mineral Stream _2

Early Deposit Mineral Stream Interests (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Early Deposit Mineral Stream Interests	The following table summarizes the early deposit mineral stream interests currently owned by the Company: Attributable Purchased Early Deposit Mineral Stream Mine Location of Upfront 1 Upfront 1, 2 Total Gold Silver Term of Toroparu Sandspring Guyana $ 15,500 $ 138,000 $ 153,500 10% 50% Life of Mine Cotabambas Panoro Peru 7,000 133,000 140,000 25% ³ 100% ³ Life of Mine Kutcho Kutcho Canada 7,000 58,000 65,000 100% 4 100% 4 Life of Mine $ 29,500 $ 329,000 $ 358,500 1) Expressed in thousands of United States dollars; excludes closing costs and capitalized interest, where applicable. 2) Please refer to Note 26 for details of when the remaining upfront consideration to be paid becomes due. 3) Once 90 million silver equivalent ounces attributable to Wheaton have been produced, the attributable production to be purchased will decrease to 66.67% of silver production and 16.67% of gold production for the life of mine. 4) Once 51,000 ounces of gold and 5.6 million ounces of silver have been delivered to Wheaton, the stream will decrease to 66.67% of gold and silver production for the life of mine.

Investment in Associate (Tables

Investment in Associate (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Disclosure of Investment in Associate	A summary of the carrying value of the Kutcho Investment in Associate and the losses recognized as a component of the Company’s net earnings during 2018 and 2017 is presented below: December 31, 2018 (in thousands) Carrying Share of Investment in Associate - Kutcho $ 2,562 $ (432) December 31, 2017 (in thousands) Carrying Share of Investment in Associate - Kutcho $ 2,994 $ -

Convertible Note Receivable (Ta

Convertible Note Receivable (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of the Company's Convertible Note Receivable	A continuity schedule of the Kutcho Convertible Note from January 1, 2017 to December 31, 2018 is presented below: Convertible At January 1, 2017 $ - Amount advanced 15,562 Fair value gain (loss) reflected in net earnings 215 At December 31, 2017 $ 15,777 Fair value gain (loss) reflected in net earnings (2,878) At December 31, 2018 $ 12,899

Long-Term Equity Investments (T

Long-Term Equity Investments (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Long-Term Equity Investments	December 31 December 31 (in thousands) 2018 2017 Common shares held $ 164,753 $ 95,608 Warrants held - 124 Total $ 164,753 $ 95,732 Common Shares Held December 31, 2018 (in thousands) Shares Percentage of Fair Value Fair Value Realized Bear Creek 13,264,305 13% $ 10,112 $ (11,247) $ - Sabina 11,700,000 4% 10,549 (10,622) - Arizona Mining n.a. n.a. - 20,153 34,061 First Majestic 20,914,590 11% 123,187 (27,813) - Other 20,905 (10,456) - $ 164,753 $ (39,985) $ 34,061 December 31, 2017 (in thousands) Shares Percentage of Fair Value Fair Value Bear Creek 13,264,305 13% $ 21,358 $ (1,859) Sabina 11,700,000 5% 21,171 12,631 Arizona Mining 10,000,000 3% 27,581 9,333 Other 25,498 (1,553) Total common shares held $ 95,608 $ 18,552 Warrants Held December 31, 2018 (in thousands) Fair Value Fair Value Warrants held - Kutcho $ - $ (124) December 31, 2017 (in thousands) Fair Value Fair Value Warrants held - Kutcho $ 124 $ (6)

Credit Facilities (Tables)

Credit Facilities (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Details of Bank Debt	December 31 December 31 (in thousands) 2018 2017 Current portion $ - $ - Long-term portion 1,264,000 770,000 Gross bank debt outstanding 1 $ 1,264,000 $ 770,000 1) There is $6 million unamortized debt issue costs associated with the Revolving Facility which have been recorded as a long-term asset under the classification Other.
Summary of Company's Finance Costs	A summary of the Company’s finance costs relative to the above facilities during the period is as follows: Years Ended December 31 (in thousands) Note 2018 2017 Interest Expense During Period Average principle outstanding during period $ 1,005,222 $ 970,750 Average effective interest rate during period 17.1 3.57% 2.57% Total interest expense incurred during period $ 35,839 $ 24,993 Costs related to undrawn credit facilities 17.1 3,707 3,839 Letter of guarantee 17.2 1,641 1,567 Total finance costs $ 41,187 $ 30,399

Issued Capital (Tables)

Issued Capital (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Capital Issued	December 31 December 31 (US dollars in thousands) Note 2018 2017 Issued capital Share capital issued and outstanding: 444,336,361 common shares (December 31, 2017: 442,724,309 common shares) 18.1 $ 3,516,437 $ 3,472,029
Summary of Common Shares Issued and Outstanding	A continuity schedule of the Company’s issued and outstanding common shares from January 1, 2017 to December 31, 2018 is presented below: Number Weighted At January 1, 2017 441,456,217 Share purchase options exercised 1 70,600 Cdn$24.83 Restricted share units released 1 21,975 $0.00 Dividend reinvestment plan 2 1,175,517 US$20.34 At December 31, 2017 442,724,309 Share purchase options exercised 1 46,800 Cdn$24.28 Restricted share units released 1 104,178 $0.00 Dividend reinvestment plan 2 1,461,074 US$18.28 At December 31, 2018 444,336,361 1) The weighted average price of share purchase options exercised and restricted share units released represents the respective exercise price. 2) The Company has implemented a dividend reinvestment plan (“DRIP”) whereby shareholders can elect to have dividends reinvested directly into additional Wheaton common shares. The weighted average price for common shares issued under the DRIP represents the volume weighted average price of the common shares on the five trading days preceding the dividend payment date, less a discount of 3%.
Schedule of Dividends Declared	Years Ended December 31 2018 2017 Dividends declared per share $ 0.36 $ 0.33 Average number of shares eligible for dividend 443,386 441,962 Total dividends paid $ 159,619 $ 145,848 Paid as follows: Cash $ 132,915 83% $ 121,934 84% DRIP 2 26,704 17% 23,914 16% Total dividends paid $ 159,619 100% $ 145,848 100% Shares issued under the DRIP 1,461,074 1,175,517 1) US dollars in thousands, except per share amounts. 2) The Company has implemented a dividend reinvestment plan (“DRIP”) whereby shareholders can elect to have dividends reinvested directly into additional Wheaton common shares at a discount of 3% of the Average Market Price, as defined in the DRIP. 3) As at December 31, 2018, cumulative dividends of $918 million have been declared and paid by the Company.

Reserves (Tables)

Reserves (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Reserves	Note December 31 December 31 (in thousands) 2018 2017 Reserves Share purchase warrants 19.1 $ 83,077 $ 83,077 Share purchase options 19.2 31,002 28,799 Restricted share units 19.3 5,970 5,178 Long-term investment revaluation reserve, net of tax 19.4 (112,156 ) (40,047 ) Total reserves $ 7,893 $ 77,007
Summary of Share Purchase Warrants	The Company’s share purchase warrants (“warrants”) are presented below: Number of Weighted Exchange Share Warrants outstanding 10,000,000 $43.75 1.00 $ 83,077
Summary of Fair Value of Share Purchase Options	The weighted average fair value of share purchase options granted and principal assumptions used in applying the Black-Scholes option pricing model are as follows: Years Ended December 31 2018 2017 Black-Scholes weighted average assumptions Grant date share price and exercise price Cdn$26.25 Cdn$27.37 Expected dividend yield 1.73% 1.15% Expected volatility 35% 36% Risk-free interest rate 1.91% 0.94% Expected option life, in years 2.5 2.5 Weighted average fair value per option granted Cdn$5.49 Cdn$5.85 Number of options issued during the period 549,210 508,360 Total fair value of options issued (000’s) $ 2,347 $ 2,236
Disclosure of Information About Options Outstanding and Exercisable	The following table summarizes information about the options outstanding and exercisable at December 31, 2018: Exercise Price (Cdn$) Exercisable Non- Exercisable Total Options Weighted $23.26 916,800 - 916,800 2.2 years $24.11 4,220 4,220 8,440 3.6 years $24.45¹ 157,200 - 157,200 2.2 years $25.48 809,150 - 809,150 1.2 years $25.89¹ 6,500 6,500 13,000 3.6 years $26.07 713,000 - 713,000 0.2 years $26.24 - 442,770 442,770 4.2 years $27.51 203,200 203,200 406,400 3.2 years $27.58¹ 126,100 - 126,100 1.2 years $27.60 910 910 1,820 3.4 years $27.84¹ - 100,590 100,590 4.2 years $27.96 - 1,690 1,690 4.4 years $28.14¹ 33,700 35,250 68,950 3.2 years $29.86¹ - 2,190 2,190 4.4 years $31.74¹ 94,250 - 94,250 0.2 years $34.86¹ 13,000 - 13,000 0.6 years $39.52 8,000 - 8,000 2.6 years 3,086,030 797,320 3,883,350 1.5 years 1) US$ share purchase options converted to Cdn$ using the exchange rate of 1.3642, being the Cdn$/US$ exchange rate at December 31, 2018.
Disclosure of Share Purchase Options Reserve	A continuity schedule of the Company’s share purchase options reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Share At January 1, 2017 $ 26,063 Recognition of fair value of share purchase options issued 3,037 Share purchase options exercised (301) At December 31, 2017 $ 28,799 Recognition of fair value of share purchase options issued 2,401 Share purchase options exercised (198) At December 31, 2018 $ 31,002
Disclosure of Outstanding Share Purchase Options	A continuity schedule of the Company’s outstanding share purchase options from January 1, 2017 to December 31, 2018 is presented below: Number of Weighted At January 1, 2017 4,097,400 Cdn$27.36 Granted (fair value - $2 million or Cdn$5.85 per option) 508,360 27.37 Exercised (70,600) 24.83 Forfeited (6,500) 27.51 Expired (296,400) 34.67 At December 31, 2017 4,232,260 Cdn$26.71 Granted (fair value - $2 million or Cdn$5.49 per option) 549,210 26.25 Exercised (46,800) 24.28 Forfeited (7,320) 29.24 Expired (844,000) 32.70 At December 31, 2018 3,883,350 Cdn$25.71
Disclosure of Restricted Share Units Reserve	A continuity schedule of the Company’s restricted share units reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Restricted Share At January 1, 2017 $ 3,669 Recognition of fair value of RSUs issued 2,014 Restricted share units released (505 ) At December 31, 2017 $ 5,178 Recognition of fair value of RSUs issued 3,031 Restricted share units released (2,239 ) At December 31, 2018 $ 5,970
Disclosure of Long Term Investment Revaluation Reserve	A continuity schedule of the Company’s long-term investment revaluation reserve from January 1, 2017 to December 31, 2018 is presented below: (in thousands) Note Change in Fair Value Deferred Tax Recovery (Expense) Total At January 1, 2017 $ (56,662) $ (846) $ (57,508) Unrealized gain (loss) on LTIs 1 18,552 (1,091) 17,461 At December 31, 2017 $ (38,110 ) $ (1,937) $ (40,047) Unrealized gain (loss) on LTIs 1 (39,985) (2,662) (42,647) Reallocate reserve to retained earnings upon disposal of LTIs 1 16 (34,061) 4,599 (29,462) At December 31, 2018 $ (112,156) $ - $ (112,156) 1) LTIs refers to long-term investments in common shares held.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of the Company's Outstanding PSUs	A continuity schedule of the Company’s outstanding PSUs (assuming a performance factor of 100% is achieved over the performance period) from January 1, 2017 to December 31, 2018 is presented below: Number of At January 1, 2017 717,564 Granted 207,220 Dividend equivalent participation 10,304 Paid 1 (275,439) Forfeited (3,050) At December 31, 2017 656,599 Granted 220,260 Paid 1 (218,615) Forfeited (2,517) At December 31, 2018 655,727 1) The PSUs paid out during the period had a performance factor of 0% resulting in a cash disbursement of $Nil.

Earnings per Share ("EPS") an_2

Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS") (Tables)	12 Months Ended
	Dec. 31, 2018
Profit or loss [abstract]
Summary of Diluted EPS Calculated Based on Weighted Average Number of Shares Outstanding	Diluted EPS is calculated based on the following weighted average number of shares outstanding: Years Ended December 31 (in thousands) 2018 2017 Basic weighted average number of shares outstanding 443,407 441,961 Effect of dilutive securities Share purchase options 81 197 Restricted share units 374 284 Diluted weighted average number of shares outstanding 443,862 442,442
Summary of Share Purchase Options and Share Purchase Warrants Excluded From Computation of Diluted Earnings Per Share	The following table lists the number of share purchase options and share purchase warrants excluded from the computation of diluted earnings per share because the exercise prices exceeded the average market value of the common shares of Cdn$25.32, compared to Cdn$26.54 for the comparable period in 2017. Years Ended December 31 (in thousands) 2018 2017 Share purchase options 2,801 1,372 Share purchase warrants 10,000 10,000 Total 12,801 11,372

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Cash Flow Information	Change in Non-Cash Working Capital Years Ended December 31 (in thousands) 2018 2017 Change in non-cash Accounts receivable $ 828 $ (729 ) Accounts payable and accrued liabilities 7,977 (5,398 ) Other 159 (219 ) Total change in non-cash $ 8,964 $ (6,346 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Income Tax Expense (Recovery)	Income tax recognized in net earnings is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Current income tax expense related to foreign jurisdictions $ 86 $ 326 Deferred income tax expense (recovery) related to: Origination and reversal of temporary differences $ 841 $ 3,602 Reversal of write down of previously recognized temporary differences (5,393 ) (4,814 ) Total deferred income tax recovery from operations $ (4,552 ) $ (1,212 ) Total income tax recovery from operations $ (4,466 ) $ (886 ) Income tax expense related to CRA Settlement 1 Current income tax expense related to CRA Settlement $ 4,020 $ - Reversal of previously recognized non-capital losses 3,848 - Income tax expense offset by previously unrecognized non-capital losses recognized through Equity 12,466 - Total income tax expense related to CRA Settlement 2 $ 20,334 $ - Income tax expense (recovery) recognized in net earnings $ 15,868 $ (886 ) 1) Reference to the CRA Settlement in Note 23 refers to the settlement of the 2005 to 2010 tax dispute and the application of the CRA Settlement principles to the 2011 to 2017 taxation years. Refer to the discussion on page 108 for more information. 2) Net of an $18 million tax benefit relating to non-capital losses and other deductions recognized through net earnings.
Schedule of Income Tax Recognized as Component of OCI	Income tax recognized as a component of OCI is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Income tax expense (recovery) related to LTIs - common shares held $ 2,662 $ 1,091 Income tax expense (recovery) recognized in OCI $ 2,662 $ 1,091
Schedule of Income Tax Recognized Directly in Equity	Income tax recognized directly in equity is comprised of the following: Years Ended December 31 (in thousands) 2018 2017 Income tax expense (recovery) related to share issue costs Origination and reversal of temporary differences $ 1,078 $ - Write down of previously recognized temporary differences (3,001 ) (65 ) Income tax expense (recovery) from operations $ (1,923 ) $ (65 ) Income tax recovery related to CRA Settlement Benefit of previously unrecognized non-capital losses related to share issue costs $ (12,466 ) $ - Income tax expense (recovery) recognized in equity $ (14,389 ) $ (65 )
Schedule of Provision for Income taxes	The provision for income taxes differs from the amount that would be obtained by applying the statutory income tax rate to consolidated earnings before income taxes due to the following: Years Ended December 31 (in thousands) 2018 2017 Earnings before income taxes $ 442,983 $ 56,817 Canadian federal and provincial income tax rates 1 27.00% 26.00% Income tax expense based on above rates $ 119,605 $ 14,772 Non-deductible 4,676 2,206 Differences in tax rates in foreign jurisdictions (133,361 ) (16,605 ) Impact of tax rate changes - (47 ) Impact of CRA Settlement 20,334 - Current period unrecognized temporary differences 10,007 3,602 Write down (reversal of write down) of previously recognized temporary differences (5,393 ) (4,814 ) Income tax expense (recovery) $ 15,868 $ (886 ) 1) Effective January 1, 2018, the BC corporate tax rate increased from 11% to 12%, resulting in the Company’s statutory tax rate increasing to 27% for years 2018 and beyond.
Deferred Income Tax Assets and Liabilities Recognized	The movement in deferred income tax assets and liabilities for the years ended December 31, 2018 and December 31, 2017, respectively, is shown below: Year Ended December 31, 2018 Opening Recovery LTI Recovery Recovery Closing Recognized deferred income Deferred tax assets Non-capital 1 $ 3,848 $ (2,057 ) $ - $ - $ 2,032 $ 3,823 Capital loss carryforward 1,965 2,633 (4,598 ) - - - Other 2 147 240 - - - 387 Deferred tax liabilities Interest capitalized for accounting (87 ) - - - - (87 ) Debt and share financing fees 3 (375 ) (107 ) - - (109 ) (591 ) Kutcho Convertible Note (29 ) 29 - - - - Unrealized gains on long-term investments (1,937 ) 1 4,598 (2,662 ) - - Mineral stream interests 4 (3,532 ) - - - - (3,532 ) Foreign withholding tax (76 ) (35 ) - - - (111 ) Total $ (76 ) $ 704 $ - $ (2,662 ) $ 1,923 $ (111 ) 1) As at December 31, 2018, the Company had recognized the tax effect on $14 million of non-capital 2) Includes: capital assets, charitable donation carryforward, and PSU accrual. 3) Debt and share financing fees are deducted over a five year period for Canadian income tax purposes. For accounting purposes, debt financing fees are deducted over the term of the credit facility and share financing fees are charged directly to issued capital. 4) The Company’s position, as reflected in its filed Canadian income tax returns, is that the cost of the precious metal acquired under the Canadian PMPAs is equal to the market value while a deposit is outstanding (where applicable to an agreement), and the cash cost thereafter, as provided for in the PMPAs. For accounting purposes, the cost of the mineral stream interests is depleted on a unit-of-production Year Ended December 31, 2017 Opening Recovery Recovery Recovery In Closing Recognized deferred income tax assets and liabilities Deferred tax assets Non-capital $ 3,508 $ 299 $ - $ 41 $ 3,848 Capital loss carryforward 846 1,119 - - 1,965 Other 43 104 - - 147 Deferred tax liabilities Interest capitalized for accounting (84 ) (3 ) - - (87 ) Debt and share financing fees 173 (572 ) - 24 (375 ) Kutcho Convertible Note - (29 ) - - (29 ) Unrealized gains on long-term investments (846 ) - (1,091 ) - (1,937 ) Mineral stream interests (3,640 ) 108 - - (3,532 ) Foreign withholding tax (262 ) 186 - - (76 ) Total $ (262 ) $ 1,212 $ (1,091 ) $ 65 $ (76 )
Schedule of Deferred Income Tax Assets Unrecognized	Deferred income tax assets in Canada not recognized are shown below: (in thousands) December 31 December 31 Non-capital 1 $ 7,209 $ 32,388 Debt and equity financing fees 4,474 7,451 Mineral stream interests 67,717 70,514 Other 3,656 1,366 Capital loss carryforward 2 7,723 10,356 Kutcho Convertible Note 648 - Unrealized losses on long-term investments 15,907 7,828 Total $ 107,334 $ 129,903 1) As at December 31, 2018, the Company had not recognized the tax effect on $27 million of non-capital 2) As at December 31, 2018, the Company had not recognized the tax effect on $29 million of net capital losses as a deferred tax asset.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Key Management Personnel Compensation, Including Directors	Key management personnel compensation, including directors, is as follows: Years Ended December 31 (in thousands) 2018 2017 Short-term benefits 1 $ 7,402 $ 6,836 Post-employment benefits 56 55 PSUs 2 6,001 28 Equity settled stock based compensation (a non-cash 3 3,559 3,427 Total executive compensation $ 17,018 $ 10,346 1) Short-term employee benefits include salaries, bonuses payable within twelve months of the balance sheet date and other annual employee benefits. 2) As more fully disclosed in Note 20.1, PSU compensation expense is recorded on a straight-line basis over the three year vesting period, with the expense being adjusted at the end of each reporting period to reflect (i) the fair value of common shares; (ii) the number of PSUs anticipated to vest; and (iii) the anticipated performance factor. 3) As more fully disclosed in Notes 19.2 and 19.3, equity settled stock based compensation expense is recorded on a straight-line basis over the vesting period.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Commitments to Purchase Mineral Stream	The following table summarizes the Company’s commitments to make per-ounce Mineral Stream Interests Attributable Payable Production to be Purchased Per Unit of Measurement Cash Payment 1, 2 Term of Date of Gold Silver Palladium Cobalt Gold Silver Palladium Cobalt Peñasquito 0% 25% 0% 0% n/a $ 4.21 n/a n/a Life of Mine 24-Jul-07 Constancia 50% 3 100% 0% 0% $ 400 4 $ 5.90 4 n/a n/a Life of Mine 8-Aug-12 Salobo 75% 0% 0% 0% $ 404 n/a n/a n/a Life of Mine 28-Feb-13 Sudbury 70% 0% 0% 0% $ 400 n/a n/a n/a 20 years 28-Feb-13 Antamina 0% 33.75% 0% 0% n/a variable 5 n/a n/a Life of Mine 3-Nov-15 San Dimas variable 6 0% 6 0% 0% $ 600 n/a n/a n/a Life of Mine 10-May-18 Stillwater 100% 0% 4.5% 7 0% variable 8 n/a variable 8 n/a Life of Mine 16-Jul-18 Voisey’s Bay 0% 0% 0% 42.4% 9 n/a n/a n/a variable 10 Life of Mine 11-Jun-18 Other Los Filos 0% 100% 0% 0% n/a $ 4.39 n/a n/a 25 years 15-Oct-04 Zinkgruvan 0% 100% 0% 0% n/a $ 4.39 n/a n/a Life of Mine 8-Dec-04 Yauliyacu 0% 100% 11 0% 0% n/a $ 8.85 12 n/a n/a Life of Mine 23-Mar-06 Stratoni 0% 100% 0% 0% n/a $ 6.77 13 n/a n/a Life of Mine 23-Apr-07 Neves-Corvo 0% 100% 0% 0% n/a $ 4.26 n/a n/a 50 years 5-Jun-07 Aljustrel 0% 100% 14 0% 0% n/a variable 15 n/a n/a 50 years 5-Jun-07 Minto 100% 16 100% 16 0% 0% $ 325 17 $ 4.22 n/a n/a Life of Mine 20-Nov-08 Keno Hill 0% 25% 0% 0% n/a variable 18 n/a n/a Life of Mine 2-Oct-08 Pascua-Lama 0% 25% 0% 0% n/a $ 3.90 n/a n/a Life of Mine 8-Sep-09 Rosemont 100% 100% 0% 0% $ 450 $ 3.90 n/a n/a Life of Mine 10-Feb-10 Loma de La Plata 0% 12.5% 0% 0% n/a $ 4.00 n/a n/a Life of Mine n/a 19 777 50% 100% 0% 0% $ 416 4 $ 6.14 4 n/a n/a Life of Mine 8-Aug-12 Early Deposit Toroparu 10% 50% 0% 0% $ 400 $ 3.90 n/a n/a Life of Mine 11-Nov-13 Cotabambas 25% 20 100% 20 0% 0% $ 450 $ 5.90 n/a n/a Life of Mine 21-Mar-16 Kutcho 100% 21 100% 21 0% 0% variable 22 variable 22 n/a n/a Life of Mine 12-Dec-17 1) Subject to an annual inflationary adjustment with the exception of Loma de La Plata and Sudbury. 2) All amounts are measured on a per ounce basis with the exception of cobalt which is measured on a per pound basis. Should the prevailing market price for the applicable metal be lower than this amount, the per ounce or per pound cash payment will be reduced to the prevailing market price, with the exception of Yauliyacu where the per ounce cash payment will not be reduced below $4.35 per ounce, subject to an annual inflationary factor. 3) Gold recoveries will be set at 55% for the Constancia deposit and 70% for the Pampacancha deposit until 265,000 ounces of gold have been delivered to the Company. 4) Subject to an increase to $9.90 per ounce of silver and $550 per ounce of gold after the initial 40-year 5) The Company is committed to pay Glencore 20% of the spot price of silver for each ounce of silver delivered under the Antamina PMPA. 6) Under the terms of the San Dimas PMPA, the Company is entitled to an amount equal to 25% of the payable gold production plus an additional amount of gold equal to 25% of the payable silver production converted to gold at a fixed gold to silver exchange ratio of 70:1 from the San Dimas mine. If the average gold to silver price ratio decreases to less than 50:1 or increases to more than 90:1 for a period of 6 months or more, then the “70” shall be revised to “50” or “90”, as the case may be, until such time as the average gold to silver price ratio is between 50:1 to 90:1 for a period of 6 months or more in which event the “70” shall be reinstated. 7) The Company is committed to purchase 4.5% of Stillwater palladium production until 375,000 ounces are delivered to the Company, thereafter 2.25% of Stillwater palladium production until 550,000 ounces are delivered to the Company and 1% of Stillwater palladium production thereafter for the life of mine. 8) The Company is committed to pay Sibanye 18% of the spot price of gold and palladium for each ounce of gold and palladium delivered under the Stillwater mines PMPA until the market value of gold and palladium delivered to Wheaton, net of the per ounce cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price thereafter. 9) Once the Company has received 31 million pounds of cobalt, the Company’s attributable cobalt production to be purchased will be reduced to 21.2%. 10) The Company is committed to pay Vale 18% of the spot price of cobalt per pound of cobalt delivered under the agreement until the market value of cobalt delivered to Wheaton, net of the per pound cash payment, exceeds the initial upfront cash deposit, and 22% of the spot price thereafter. 11) Wheaton is committed to purchase from Glencore a per annum amount equal to the first 1.5 million ounces of payable silver produced at Yauliyacu and 50% of any excess. 12) Should the market price of silver exceed $20 per ounce, in addition to the $8.85 per ounce, the Company is committed to pay Glencore an additional amount for each ounce of silver delivered equal to 50% of the excess, to a maximum of $10 per ounce, such that when the market price of silver is $40 or above, the Company will pay Glencore $18.85 per ounce of silver delivered. 13) In October 2015, in order to incentivize additional exploration and potentially extend the limited remaining mine life of Stratoni, Wheaton and Eldorado Gold agreed to modify the Stratoni PMPA. The primary modification is to increase the production price per ounce of silver delivered to Wheaton over the current fixed price by one of the following amounts: (i) $2.50 per ounce of silver delivered if 10,000 meters of drilling is completed outside of the existing ore body and within Wheaton’s defined area of interest (“Expansion Drilling”); (ii) $5.00 per ounce of silver delivered if 20,000 meters of Expansion Drilling is completed; and (iii) $7.00 per ounce of silver delivered if 30,000 meters of Expansion Drilling is completed. Drilling in all three cases must be completed by December 31, 2020, in order for the agreed upon increase in production price to be initiated. The figures in the above table reflect the fact that Eldorado completed 10,000 meters of Expansion Drilling in July 2018. 14) Wheaton only has the rights to silver contained in concentrate containing less than 15% copper at the Aljustrel mine. 15) During the second quarter of 2018, the Company agreed to amend the Aljustrel PMPA with Almina to increase the production payments to 50% of the amount received under the respective concentrate sales contracts and to fix silver payable rates for a period of two years and limit rate decreases thereafter. 16) The Company is committed to acquire 100% of the first 30,000 ounces of gold produced per annum and 50% thereafter. The Minto mine was placed into care and maintenance in October 2018. 17) The production payment per ounce of gold delivered to Wheaton is to be increased over the current fixed price in periods where the market price of copper is lower than $2.50 per pound. 18) The production payment related to the Keno Hill silver interest is a function of the silver head grade and silver spot price in the month in which the silver is produced. 19) Terms of the agreement not yet finalized. 20) Once 90 million silver equivalent ounces attributable to Wheaton have been produced, the attributable production to be purchased will decrease to 66.67% of silver production and 16.67% of gold production for the life of mine. 21) Once 51,000 ounces of gold and 5.6 million ounces of silver have been delivered to Wheaton, the stream will decrease to 66.67% of gold and silver production for the life of mine. 22) The Company is committed to pay Kutcho 20% of the spot price of gold and silver for each ounce of gold and silver delivered under the Kutcho Early Deposit Agreement.
Summary of Other Contractual Obligations and Contingencies	Other Contractual Obligations and Contingencies Obligations With Scheduled Payment Dates (in thousands) 2019 2020 - 2022 2023 - 2024 After 2024 Sub-Total Other Commitments Total Bank debt 1 $ - $ - $ 1,264,000 $ - $ 1,264,000 $ - $ 1,264,000 Interest 2 53,845 142,169 46,541 - 242,555 - 242,555 Mineral stream interest payments 3 Rosemont 4 - - - - - 231,150 231,150 Loma de La Plata - - - - - 32,400 32,400 Toroparu - - - - - 138,000 138,000 Cotabambas 1,500 4,500 1,000 - 7,000 126,000 133,000 Kutcho - - - - - 58,000 58,000 Operating leases 789 1,696 1,076 224 3,785 - 3,785 Total contractual obligations $ 56,134 $ 148,365 $ 1,312,617 $ 224 $ 1,517,340 $ 585,550 $ 2,102,890 1) At December 31, 2018, the Company had $1.3 billion drawn and outstanding on the Revolving Facility. 2) As the applicable interest rates are floating in nature, the interest charges are estimated based on market-based forward interest rate curves at the end of the reporting period combined with the assumption that the principal balance outstanding at December 31, 2018 does not change until the debt maturity date. 3) Does not reflect the contingent payment due related to the Salobo gold purchase agreement (see the Salobo section on the following page). 4) Includes contingent transaction costs of $1 million.

Segmented Information (Tables)

Segmented Information (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Operating Segments	The Company’s reportable operating segments, which are the components of the Company’s business where separate financial information is available and which are evaluated on a regular basis by the Company’s Chief Executive Officer (“CEO”), who is the Company’s chief operating decision maker, for the purpose of assessing performance, are summarized in the tables below: Year Ended December 31, 2018 Sales Cost Depletion Net Cash Flow Total (in thousands) Gold Sudbury 1, 5 $ 21,785 $ 6,804 $ 13,525 $ 1,456 $ 14,959 $ 366,463 Salobo 5 336,474 106,347 102,672 127,455 230,126 2,706,060 Constancia 5 15,259 4,818 4,504 5,937 10,441 117,547 San Dimas 2 26,943 13,177 12,234 1,532 13,766 208,195 Stillwater 6,777 1,215 2,925 2,637 5,562 236,432 Other 3, 5 33,955 10,367 10,459 13,129 22,162 21,359 Total gold interests $ 441,193 $ 142,728 $ 146,319 $ 152,146 $ 297,016 $ 3,656,056 Silver San Dimas 2 $ 40,594 $ 10,549 $ 3,575 $ 26,470 $ 30,045 $ - Peñasquito 5 77,691 20,501 14,528 42,662 57,190 388,722 Antamina 5 86,408 17,265 47,561 21,582 69,143 710,077 Constancia 5 34,082 12,863 15,572 5,647 21,219 246,231 Other 4, 5 104,804 40,232 20,699 43,873 64,645 502,638 Total silver interests $ 343,579 $ 101,410 $ 101,935 $ 140,234 $ 242,242 $ 1,847,668 Palladium Stillwater $ 9,240 $ 1,656 $ 4,033 $ 3,551 $ 7,584 $ 259,693 Cobalt Voisey’s Bay $ - $ - $ - $ - $ - $ 393,422 Total mineral stream interests $ 794,012 $ 245,794 $ 252,287 $ 295,931 $ 546,842 $ 6,156,839 Other General and administrative $ (51,650 ) $ (29,509 ) Finance costs (41,187 ) (40,363 ) Other (5,826 ) 1,403 Gain on disposal of the San Dimas SPA 245,715 - Income tax expense (15,868 ) (960 ) Total other $ 131,184 $ (69,429 ) $ 313,207 Consolidated $ 427,115 $ 477,413 $ 6,470,046 1) Comprised of the operating Coleman, Copper Cliff, Garson, Creighton and Totten gold interests, the non-operating 2) On May 10, 2018, the Company terminated the San Dimas SPA and concurrently entered into the new San Dimas PMPA. 3) Where a gold interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the gold interest has been summarized under Other gold interests. Other gold interests are comprised of the operating Minto and 777 gold interests and the non-operating 4) Where a silver interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the silver interest has been summarized under Other silver interests. Other silver interests are comprised of the operating Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Neves-Corvo, Minto, Aljustrel, and 777 silver interests, the non-operating 5) As it relates to mine operator concentration risk: a. The counterparty obligations under the Salobo, Sudbury and Voisey’s Bay PMPAs are guaranteed by the parent company Vale. Total revenues relative to Vale during the year ended December 31, 2018 were 45% of the Company’s total revenue. b. The counterparty obligations under the Antamina PMPA and the Yauliyacu PMPA (which is included as part of Other silver interests) are guaranteed by the parent company Glencore plc (“Glencore”) and its subsidiary. Total revenues relative to Glencore during the year ended December 31, 2018 were 15% of the Company’s total revenue. c. The counterparty obligations under the Penasquito PMPA and the Los Filos PMPA (which is included as part of Other silver interests) are guaranteed by Goldcorp. Total revenues relative to Goldcorp during the year ended December 31, 2018 were 10% of the Company’s total revenue. d. The counterparty obligations under the Constancia PMPA and the 777 PMPA (which is included as part of Other gold and silver interests) are guaranteed by the parent company Hudbay Minerals Inc. (“Hudbay”). Total revenues relative to Hudbay during the year ended December 31, 2018 were 10% of the Company’s total revenue. Should any of these mine operators become unable or unwilling to fulfill their obligations under their agreements with the Company, there could be a material adverse impact on the Company including, but not limited to, the Company’s revenue, net income and cash flows from operations. Year Ended December 31, 2017 Sales Cost of Sales Depletion Gross Impairment 1 Net Earnings (Loss) Cash Flow Total (in thousands) Gold Sudbury 2, 6 $ 35,253 $ 11,202 $ 21,547 $ 2,504 $ - $ 2,504 $ 24,042 $ 379,988 Salobo 6 317,596 100,946 96,103 120,547 - 120,547 216,650 2,808,732 Constancia 6 11,125 3,537 3,619 3,969 - 3,969 7,575 122,051 Other 3, 6 59,967 17,480 19,415 23,072 - 23,072 38,778 31,818 Total gold interests $ 423,941 $ 133,165 $ 140,684 $ 150,092 $ - $ 150,092 $ 287,045 $ 3,342,589 Silver San Dimas 4 $ 65,677 $ 16,790 $ 5,713 $ 43,174 $ - $ 43,174 $ 48,887 $ 134,862 Peñasquito 87,906 20,856 14,827 52,223 - 52,223 67,050 403,250 Antamina 6 100,617 20,183 58,168 22,266 - 22,266 80,434 757,638 Constancia 6 33,026 11,353 14,168 7,505 - 7,505 21,470 261,803 Other 5, 6 132,048 41,454 28,820 61,774 228,680 (166,906 ) 88,495 523,135 Total silver interests $ 419,274 $ 110,636 $ 121,696 $ 186,942 $ 228,680 $ (41,738 ) $ 306,336 $ 2,080,688 Total mineral stream interests $ 843,215 $ 243,801 $ 262,380 $ 337,034 $ 228,680 $ 108,354 $ 593,381 $ 5,423,277 Corporate General and administrative $ (34,673 ) $ (30,298 ) Finance costs (30,399 ) (29,570 ) Other 13,535 5,874 Income tax recovery 886 (579 ) Total corporate $ (50,651 ) $ (54,573 ) $ 260,036 Consolidated $ 57,703 $ 538,808 $ 5,683,313 1) See Note 11 for more information. 2) Comprised of the operating Coleman, Copper Cliff, Garson, Creighton and Totten gold interests, the non-operating 3) Where a gold interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the gold interest has been summarized under Other gold interests. Other gold interests are comprised of the operating Minto and 777 gold interests and the non-operating 4) On May 10, 2018, the Company terminated the San Dimas SPA and concurrently entered into the new San Dimas PMPA. 5) Where a silver interest represents less than 10% of the Company’s sales, gross margin or aggregate asset book value and is not evaluated on a regular basis by the Company’s CEO for the purpose of assessing performance, the silver interest has been summarized under Other silver interests. Other silver interests are comprised of the operating Los Filos, Zinkgruvan, Yauliyacu, Stratoni, Neves-Corvo, Minto, and 777 silver interests, the non-operating 6) As it relates to mine operator concentration risk: a. The counterparty obligations under the Salobo and Sudbury PMPAs are guaranteed by the parent company Vale. Total revenues relative to Vale during the year ended December 31, 2017 were 42% of the Company’s total revenue. b. The counterparty obligations under the Antamina PMPA and the Yauliyacu PMPA (which is included as part of Other silver interests) are guaranteed by the parent company Glencore and its subsidiary. Total revenues relative to Glencore during the year ended December 31, 2017 were 16% of the Company’s total revenue. c. The counterparty obligations under the Penasquito PMPA and the Los Filos PMPA (which is included as part of Other silver interests) are guaranteed by Goldcorp. Total revenues relative to Goldcorp during the year ended December 31, 2017 were 10% of the Company’s total revenue. d. The counterparty obligations under the Constancia PMPA and the 777 PMPA (which is included as part of Other gold and silver interests) are guaranteed by the parent company Hudbay. Total revenues relative to Hudbay during the year ended December 31, 2017 were 10% of the Company’s total revenue. Should any of these mine operators become unable or unwilling to fulfill their obligations under their agreements with the Company, there could be a material adverse impact on the Company including, but not limited to, the Company’s revenue, net income and cash flows from operations.
Schedule of Company's Geographical Information	The Company’s geographical information, which is based on the location of the mining operations to which the mineral stream interests relate, are summarized in the tables below: Carrying Amount at Dec 31, 2018 (in thousands) Sales: Gold Silver Palladium Cobalt Total North America Canada $ 64,589 8 % $ 387,823 $ 33,901 $ - $ 393,422 $ 815,146 13 % United States 16,018 2 % 236,432 551 259,693 - 496,676 8 % Mexico 147,274 19 % 208,194 390,079 - - 598,273 10 % Europe Greece 8,020 1 % - 5,884 - - 5,884 0 % Portugal 20,484 2 % - 22,420 - - 22,420 0 % Sweden 24,188 3 % - 37,371 - - 37,371 1 % South America Argentina/Chile 1 4,444 1 % - 264,401 - - 264,401 4 % Brazil 336,474 42 % 2,706,061 - - - 2,706,061 44 % Peru 172,521 22 % 117,546 1,093,061 - - 1,210,607 20 % Consolidated $ 794,012 100 % $ 3,656,056 $ 1,847,668 $ 259,693 $ 393,422 $ 6,156,839 100 % 1)   Includes the Pascua-Lama project, which straddles the border of Argentina and Chile.     Carrying Amount at Dec 31, 2017 (in thousands) Sales: Gold Silver Palladium Cobalt Total North America Canada $ 106,733 13 % $ 411,807 $ 36,798 $ - $ - $ 448,605 8 % United States - 0 % - 433 - - 433 0 % Mexico 162,390 19 % - 539,620 - - 539,620 10 % Europe Greece 8,756 1 % - 9,036 - - 9,036 0 % Portugal 8,616 1 % - 23,725 - - 23,725 0 % Sweden 27,569 3 % - 39,614 - - 39,614 1 % South America Argentina/Chile 1 12,041 1 % - 266,989 - - 266,989 5 % Brazil 317,597 38 % 2,808,731 - - - 2,808,731 52 % Peru 199,513 24 % 122,051 1,164,473 - - 1,286,524 24 % Consolidated $ 843,215 100 % $ 3,342,589 $ 2,080,688 $ - $ - $ 5,423,277 100 % 1) Includes the Pascua-Lama project, which straddles the border of Argentina and Chile.

Description of Business and N_2

Description of Business and Nature of Operations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018AgreementAsset
Description of business and nature of operations [abstract]
Number of long-term purchase agreements | Agreement	23
Number of early deposit long-term purchase agreements | Agreement	3
Number of mining companies engaged in precious metal purchase agreements | Agreement	17
Number of currently operating mining assets	19
Number of mining assets under various stages of development	9
Number of countries operating mining assets	11
Number of mining assets placed in care and maintenance	2

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Detail) - USD ($)	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of significant accounting policies [line items]
Proportion of ownership interest in subsidiary		100.00%
Cash and cash equivalents maximum maturity period		3 months
Vesting period		3 years
Performance share units (PSUs) [member]
Disclosure of significant accounting policies [line items]
Vesting period		3 years
Adoption of IFRS 16 [member]
Disclosure of significant accounting policies [line items]
Right of uses assets under IFRS 16	$ 5,000,000
Reduction in operating cash out flow upon adoption of IFRS 16	$ 1,000,000
Forward contract [member]
Disclosure of significant accounting policies [line items]
Forward contracts		$ 0	$ 0
Wheaton Precious Metals International Ltd [member]
Disclosure of significant accounting policies [line items]
Proportion of ownership interest in subsidiary		100.00%
Wheaton Precious Metals (Cayman) Co [member]
Disclosure of significant accounting policies [line items]
Proportion of ownership interest in subsidiary		100.00%
Silver Wheaton Luxembourg S.a.r.l [member]
Disclosure of significant accounting policies [line items]
Proportion of ownership interest in subsidiary		100.00%

Key Sources of Estimation Unc_2

Key Sources of Estimation Uncertainty and Critical Accounting Judgments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of key sources of estimation uncertainty [line items]
Mineral stream interests	$ 6,156,839,000	$ 5,423,277,000
Kutcho Copper Corp [member]
Disclosure of key sources of estimation uncertainty [line items]
Percentage of ownership interest in associate	11.00%
Minto derivative liability [member] | Consensus pricing [member]
Disclosure of key sources of estimation uncertainty [line items]
Analyst consensus copper price per pound exceeds	$ 2.50

Financial Instruments - Classif

Financial Instruments - Classification of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial assets
Cash and cash equivalents	$ 75,767	$ 98,521	$ 124,295
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Long-term investments - warrants held		124
Convertible note receivable	12,899	15,777
Long-term investments - common shares held	164,753	95,608
Other accounts receivable	1,064	1,796
Total financial assets	255,815	213,224
Financial liabilities
Accounts payable and accrued liabilities	19,883	12,118
Bank debt	1,264,000	770,000
Total financial liabilities	1,283,883	782,118
Financial assets at fair value through net earnings, category [member]
Financial assets
Cash and cash equivalents	75,767	98,521
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Long-term investments - warrants held		124
Convertible note receivable	12,899	15,777
Financial assets at fair value through other comprehensive income, category [member]
Financial assets
Long-term investments - common shares held	164,753	95,608
Financial assets at amortized cost, category [member]
Financial assets
Other accounts receivable	1,064	1,796
Financial liabilities at amortized cost, category [member]
Financial liabilities
Accounts payable and accrued liabilities	19,883	12,118
Bank debt	$ 1,264,000	$ 770,000

Financial Instruments - Maximum

Financial Instruments - Maximum Exposure to Credit Risk Related to Financial Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 75,767	$ 98,521	$ 124,295
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Other accounts receivables	1,064	1,796
Convertible note receivable	12,899	15,777
Maximum exposure to credit risk [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	75,767	98,521
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Other accounts receivables	1,064	1,796
Convertible note receivable	12,899	15,777
Maximum exposure to credit risk related to financial assets	$ 91,062	$ 117,492

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 75,767,000	$ 98,521,000		$ 124,295,000
Working capital	51,000,000	91,000,000
Long-term investments-equity investments held	164,753,000	95,608,000
Increased/decreased in other comprehensive income on assumption	$ 16,000,000	$ 10,000,000
Interest rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Weighted average effective interest rate paid on its outstanding borrowings, percentage	3.57%	2.57%
Change in interest rate, percentage	1.00%	1.00%
Impacted in interest expense due to fluctuation in interest rates	$ 10,000,000	$ 10,000,000
Minto derivative liability [member]
Disclosure of detailed information about financial instruments [line items]
Minimum market price of copper before Minto top up payment is required	2.50	2.50	$ 2.50
Fair value of Minto derivative liability	0	0
Financial assets at fair value through other comprehensive income, category [member]
Disclosure of detailed information about financial instruments [line items]
Long-term investments-equity investments held	$ 164,753,000	$ 95,608,000
Kutcho [member]
Disclosure of detailed information about financial instruments [line items]
Non convertible debt interest rate	15.00%
Volatility rate	30.00%
Non convertible debt interest rate, fluctuation	1.00%
Effect of one percent change in interest rates on fair value of convertible debt	$ 600,000
Convertible debt volatility rate, fluctuation	5.00%
Effect of changing implied volatility by five percent on fair value of convertible debt	$ 200,000

Financial Instruments - Timing

Financial Instruments - Timing Associated with Remaining Contractual Payments Relating to Financial Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-derivative financial liabilities
Bank debt	$ 1,264,000	$ 770,000
Accounts payable and accrued liabilities	19,883	$ 12,118
Non-Derivative Financial Instrument [Member]
Non-derivative financial liabilities
Bank debt	1,264,000
Interest on bank debt	242,555
Accounts payable and accrued liabilities	19,883
Performance share units	10,756
Financial liabilities and contractual commitments, undiscounted cash flows	1,537,194
Non-Derivative Financial Instrument [Member] | 2019 [member]
Non-derivative financial liabilities
Interest on bank debt	53,845
Accounts payable and accrued liabilities	19,883
Performance share units	5,578
Financial liabilities and contractual commitments, undiscounted cash flows	79,306
Non-Derivative Financial Instrument [Member] | 2020 [member]
Non-derivative financial liabilities
Interest on bank debt	50,021
Performance share units	3,890
Financial liabilities and contractual commitments, undiscounted cash flows	53,911
Non-Derivative Financial Instrument [Member] | 2021 [member]
Non-derivative financial liabilities
Interest on bank debt	46,564
Performance share units	1,288
Financial liabilities and contractual commitments, undiscounted cash flows	47,852
Non-Derivative Financial Instrument [Member] | 2022 [member]
Non-derivative financial liabilities
Interest on bank debt	45,584
Financial liabilities and contractual commitments, undiscounted cash flows	45,584
Non-Derivative Financial Instrument [Member] | 2023 [member]
Non-derivative financial liabilities
Bank debt	1,264,000
Interest on bank debt	46,541
Financial liabilities and contractual commitments, undiscounted cash flows	$ 1,310,541

Financial Instruments - Timin_2

Financial Instruments - Timing Associated with Remaining Contractual Payments Relating to Financial Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Revolving facility [member]
Disclosure of detailed information about financial commitments [line items]
Revolving credit facility extended maturity	. 2, 2024

Financial Instruments - Summary

Financial Instruments - Summary of Carrying Amounts of Canadian Dollar Denominated Monetary Assets and Monetary Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Monetary assets
Cash and cash equivalents	$ 75,767	$ 98,521	$ 124,295
Accounts receivable	2,396	3,194
Long-term investments - common shares held	164,753	95,608
Long-term investments - warrants held		124
Convertible note receivable	12,899	15,777
Other long-term assets	13,941	11,289
Monetary liabilities
Accounts payable and accrued liabilities	19,883	12,118
Current taxes payable	3,361
Currency risk [member]
Monetary assets
Cash and cash equivalents	731	453
Accounts receivable	637	71
Long-term investments - common shares held	161,421	90,003
Long-term investments - warrants held		124
Convertible note receivable	12,899	15,777
Other long-term assets	1,105	717
Total Canadian dollar denominated monetary assets	176,793	107,145
Monetary liabilities
Accounts payable and accrued liabilities	16,128	5,542
Current taxes payable	3,361
Performance share units	8,808	1,165
Total Canadian dollar denominated monetary liabilities	$ 28,297	$ 6,707

Financial Instruments - Summa_2

Financial Instruments - Summary of Sensitivity to 10% Increase or Decrease in Canadian Dollar Relative to United States Dollar (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of sensitivity to ten percentage increase or decrease in exchange rate [abstract]
Increase (decrease) in net earnings	$ (1,292)	$ 1,043
Increase (decrease) in other comprehensive income	16,142	9,000
Increase (decrease) in total comprehensive income	14,850	10,043
Increase (decrease) in net earnings	1,292	(1,043)
Increase (decrease) in other comprehensive income	(16,142)	(9,000)
Increase (decrease) in total comprehensive income	$ (14,850)	$ (10,043)

Financial Instruments - Summa_3

Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value by Level within Fair Value Hierarchy (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurements of assets and liabilities [line items]
Cash and cash equivalents	$ 75,767	$ 98,521	$ 124,295
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Long-term investments - common shares held	164,753	95,608
Long-term investments - warrants held		124
Convertible note receivable	12,899	15,777
Total net financial assets measured at fair value	254,751	211,428
Investments in equity instruments designated at fair value through other comprehensive income [member]
Disclosure of fair value measurements of assets and liabilities [line items]
Long-term investments - common shares held	164,753	95,608
Level 1 [member]
Disclosure of fair value measurements of assets and liabilities [line items]
Cash and cash equivalents	75,767	98,521
Total net financial assets measured at fair value	240,520	194,129
Level 1 [member] | Investments in equity instruments designated at fair value through other comprehensive income [member]
Disclosure of fair value measurements of assets and liabilities [line items]
Long-term investments - common shares held	164,753	95,608
Level 2 [member]
Disclosure of fair value measurements of assets and liabilities [line items]
Trade receivables from provisional concentrate sales, net of fair value adjustment	1,332	1,398
Long-term investments - warrants held		124
Total net financial assets measured at fair value	1,332	1,522
Level 3 [member]
Disclosure of fair value measurements of assets and liabilities [line items]
Convertible note receivable	12,899	15,777
Total net financial assets measured at fair value	$ 12,899	$ 15,777

Revenue - Summary of Revenue (D

Revenue - Summary of Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue [abstract]
Gold credit sales	$ 431,618	$ 394,809
Concentrate sales	9,575	29,132
Revenue from sale of gold	441,193	423,941
Silver credit sales	290,152	365,251
Concentrate sales	53,427	54,023
Revenue from sale of silver	343,579	419,274
Palladium credit sales	9,240
Total sales revenue	$ 794,012	$ 843,215
Gold
Gold credit sales	54.00%	47.00%
Concentrate sales	1.00%	3.00%
Revenue from sale	55.00%	50.00%
Silver
Silver credit sales	37.00%	43.00%
Concentrate sales	7.00%	7.00%
Revenue from sale	44.00%	50.00%
Palladium
Palladium credit sales	1.00%	0.00%
Total sales revenue	100.00%	100.00%

Revenue - Additional Informatio

Revenue - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)Contractoz	Dec. 31, 2017USD ($)Contractoz
Disclosure of revenue [line items]
Number of forward contracts outstanding | Contract	0	0
Outstanding provisionally priced sales of silver and gold	$ 7,000,000	$ 4,000,000
Ounces of silver sold relative to outstanding provisionally priced sales | oz	400,000	200,000
Ounces of gold sold relative to outstanding provisionally priced sales | oz	500	800
Increase or decrease in revenue associated with outstanding provisionally priced silver sales invoices for each one cent per ounce increase or decrease in the realized silver price	$ 4,500	$ 2,000
Increase or decrease in revenue associated with outstanding provisionally priced gold sales invoices for each one dollar per ounce increase or decrease in the realized gold price	$ 500	$ 800
Customer A [member]
Disclosure of revenue [line items]
Risk Revenue	29.00%	32.00%
Customer B [member]
Disclosure of revenue [line items]
Risk Revenue	22.00%	23.00%
Customer C [member]
Disclosure of revenue [line items]
Risk Revenue	13.00%	11.00%
Provisionally prices sales of silver and gold [member]
Disclosure of revenue [line items]
Fair value gain adjustment associated with embedded derivative	$ 500,000	$ 300,000

General and Administrative - Su

General and Administrative - Summary of General and Administrative Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Salaries and benefits
Salaries and benefits, excluding PSUs		$ 14,397	$ 12,054
PSUs		9,517	140
Total salaries and benefits		23,914	12,194
Depreciation		1,057	972
Donations		2,610	2,141
Professional fees		8,559	3,938
Other		10,078	10,377
General and administrative before equity settled stock based compensation		46,218	29,622
Total equity settled stock based compensation		5,432	5,051
Total general and administrative	[1]	51,650	34,673
Employee stock options [member]
Salaries and benefits
Total equity settled stock based compensation		2,401	3,037
Restricted stock units [member]
Salaries and benefits
Total equity settled stock based compensation		$ 3,031	$ 2,014
[1]	Equity settled stock based compensation (a non-cash item) included in general and administrative expenses $ 5,432 $ 5,051

General and Administrative - _2

General and Administrative - Summary of General and Administrative Expense (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Significant non cash charges [abstract]
Average performance factor used to calculate the accrual related to the anticipated fair value of the PSUs issue	141.00%	17.00%

Other (Income) Expense - Summar

Other (Income) Expense - Summary of Other (Income) Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other operating income [line items]
Interest income		$ (750)	$ (407)
Proceeds relative to the Mercator Minerals bankruptcy	$ (1,000)		(1,022)
Guarantee fees - Primero Revolving Credit Facility		(858)	(2,683)
Fees for contract amendments and reconciliations		(248)	(9,424)
Share of losses of associate		432
Foreign exchange (gain) loss		(144)	270
Interest and penalties related to CRA Settlement		4,317
Loss on fair value adjustment of share purchase warrants held		124	6
Other		153
Total other (income) expense		5,826	(13,535)
Kutcho [member]
Disclosure of other operating income [line items]
Loss on fair value adjustment of Kutcho Convertible Note		2,878	(215)
Investments in equity instruments designated at fair value through other comprehensive income [member]
Disclosure of other operating income [line items]
Dividends received from equity investments designated as FVTOCI relating to investments held at the end of the reporting period		$ (78)	$ (60)

Other (Income) Expense - Additi

Other (Income) Expense - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other operating income [line items]
Proceeds relative to the Mercator Minerals bankruptcy		$ 1,000		$ 1,022
Fees for contract amendments and reconciliations			$ 248	9,424
Minto [member] | Capstone [member]
Disclosure of other operating income [line items]
Fees for contract amendments and reconciliations				$ 8,000
Primero Mining Corp [member]
Disclosure of other operating income [line items]
Guarantee fee as percentage of outstanding loan in connection with guarantee and extensions of guarantee	5.00%

Accounts Receivable - Summary o

Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Trade and other receivables [abstract]
Trade receivables from provisional concentrate sales, net of fair value adjustment	$ 1,332	$ 1,398
Other accounts receivables	1,064	1,796
Total accounts receivable	$ 2,396	$ 3,194

Mineral Stream Interests - Sche

Mineral Stream Interests - Schedule of Mineral Stream Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	$ 5,423,277
Ending balance	6,156,839	$ 5,423,277
Depletion	(252,287)	(262,380)
Impairment		(228,680)
Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	3,342,589
Ending balance	3,656,056	3,342,589
Depletion	(146,319)	(140,684)
Gold interests [member] | Sudbury [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	379,988
Ending balance	366,463	379,988
Gold interests [member] | Salobo [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	2,808,732
Ending balance	2,706,060	2,808,732
Gold interests [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	122,051
Ending balance	117,547	122,051
Gold interests [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	208,195
Gold interests [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	236,432
Gold interests [member] | Other gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	31,818
Ending balance	21,359	31,818
Gold interests [member] | Cost [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	4,222,030	4,222,030
Additions	459,786
Ending balance	4,681,816	4,222,030
Gold interests [member] | Cost [member] | Sudbury [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	623,864	623,864
Ending balance	623,864	623,864
Gold interests [member] | Cost [member] | Salobo [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	3,059,876	3,059,876
Ending balance	3,059,876	3,059,876
Gold interests [member] | Cost [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	136,058	136,058
Ending balance	136,058	136,058
Gold interests [member] | Cost [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Additions	220,429
Ending balance	220,429
Gold interests [member] | Cost [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Additions	239,357
Ending balance	239,357
Gold interests [member] | Cost [member] | Other gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	402,232	402,232
Ending balance	402,232	402,232
Gold interests [member] | Accumulated Depletion & Impairment [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(879,441)	(738,757)
Ending balance	(1,025,760)	(879,441)
Depletion	(146,319)	(140,684)
Gold interests [member] | Accumulated Depletion & Impairment [member] | Sudbury [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(243,876)	(222,329)
Ending balance	(257,401)	(243,876)
Depletion	(13,525)	(21,547)
Gold interests [member] | Accumulated Depletion & Impairment [member] | Salobo [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(251,144)	(155,041)
Ending balance	(353,816)	(251,144)
Depletion	(102,672)	(96,103)
Gold interests [member] | Accumulated Depletion & Impairment [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(14,007)	(10,388)
Ending balance	(18,511)	(14,007)
Depletion	(4,504)	(3,619)
Gold interests [member] | Accumulated Depletion & Impairment [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	(12,234)
Depletion	(12,234)
Gold interests [member] | Accumulated Depletion & Impairment [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	(2,925)
Depletion	(2,925)
Gold interests [member] | Accumulated Depletion & Impairment [member] | Other gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(370,414)	(350,999)
Ending balance	(380,873)	(370,414)
Depletion	(10,459)	(19,415)
Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	2,080,688
Ending balance	1,847,668	2,080,688
Depletion	(101,935)	(121,696)
Impairment		(228,680)
Silver interests [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	134,862
Ending balance		134,862
Silver interests [member] | Penasquito [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	403,250
Ending balance	388,722	403,250
Silver interests [member] | Antamina [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	757,638
Ending balance	710,077	757,638
Silver interests [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	261,803
Ending balance	246,231	261,803
Silver interests [member] | Other silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	523,135
Ending balance	502,638	523,135
Silver interests [member] | Cost [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	3,201,085	3,247,979
Additions	202
Disposal	(190,331)	(41,959)
Ending balance	3,010,956	3,201,085
Reductions		(4,935)
Silver interests [member] | Cost [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	190,331	190,331
Disposal	(190,331)
Ending balance		190,331
Silver interests [member] | Cost [member] | Penasquito [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	524,626	524,626
Ending balance	524,626	524,626
Silver interests [member] | Cost [member] | Antamina [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	900,343	900,343
Ending balance	900,343	900,343
Silver interests [member] | Cost [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	302,948	302,948
Ending balance	302,948	302,948
Silver interests [member] | Cost [member] | Other silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	1,282,837	1,329,731
Additions	202
Disposal		(41,959)
Ending balance	1,283,039	1,282,837
Reductions		(4,935)
Silver interests [member] | Accumulated Depletion & Impairment [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(1,120,397)	(811,980)
Disposal	59,044	41,959
Ending balance	(1,163,288)	(1,120,397)
Depletion	(101,935)	(121,696)
Impairment		(228,680)
Silver interests [member] | Accumulated Depletion & Impairment [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(55,469)	(49,756)
Disposal	59,044
Ending balance		(55,469)
Depletion	(3,575)	(5,713)
Silver interests [member] | Accumulated Depletion & Impairment [member] | Penasquito [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(121,376)	(106,549)
Ending balance	(135,904)	(121,376)
Depletion	(14,528)	(14,827)
Silver interests [member] | Accumulated Depletion & Impairment [member] | Antamina [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(142,705)	(84,537)
Ending balance	(190,266)	(142,705)
Depletion	(47,561)	(58,168)
Silver interests [member] | Accumulated Depletion & Impairment [member] | Constancia [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(41,145)	(26,977)
Ending balance	(56,717)	(41,145)
Depletion	(15,572)	(14,168)
Silver interests [member] | Accumulated Depletion & Impairment [member] | Other silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(759,702)	(544,161)
Disposal		41,959
Ending balance	(780,401)	(759,702)
Depletion	(20,699)	(28,820)
Impairment		(228,680)
Palladium interest [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	259,693
Palladium interest [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	259,693
Palladium interest [member] | Cost [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Additions	263,726
Ending balance	263,726
Palladium interest [member] | Accumulated Depletion & Impairment [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	(4,033)
Depletion	(4,033)
Cobalt Interests [member]
Disclosure Of Mineral Stream Interests [line items]
Ending balance	393,422
Cobalt Interests [member] | Cost [member]
Disclosure Of Mineral Stream Interests [line items]
Additions	393,422
Ending balance	393,422
Mineral Stream Interests [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	5,423,277
Ending balance	6,156,839	5,423,277
Depletion	(252,287)	(262,380)
Impairment		(228,680)
Mineral Stream Interests [member] | Cost [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	7,423,115	7,470,009
Additions	1,117,136
Disposal	(190,331)	(41,959)
Ending balance	8,349,920	7,423,115
Reductions		(4,935)
Mineral Stream Interests [member] | Accumulated Depletion & Impairment [member]
Disclosure Of Mineral Stream Interests [line items]
Beginning balance	(1,999,838)	(1,550,737)
Disposal	59,044	41,959
Ending balance	(2,193,081)	(1,999,838)
Depletion	$ (252,287)	(262,380)
Impairment		$ (228,680)

Mineral Stream Interests - Sc_2

Mineral Stream Interests - Schedule of Mineral Stream Interests (Parenthetical) (Detail) - USD ($) shares in Millions, $ in Millions	Apr. 10, 2017	Dec. 31, 2018	Dec. 31, 2017
Alexco Resource Corp [member]
Disclosure Of Mineral Stream Interests [line items]
Common shares received	3
Fair value of shares received	$ 5
Accumulated impairment [member] | Gold interests [member] | Sudbury [member]
Disclosure Of Mineral Stream Interests [line items]
Cumulative impairment charges		$ 120	$ 120
Accumulated impairment [member] | Gold interests [member] | Seven hundred and seventy seven [member]
Disclosure Of Mineral Stream Interests [line items]
Cumulative impairment charges		151	151
Accumulated impairment [member] | Silver interests [member] | Keno Hill [member]
Disclosure Of Mineral Stream Interests [line items]
Cumulative impairment charges		11	11
Accumulated impairment [member] | Silver interests [member] | Pascua-Lama [member]
Disclosure Of Mineral Stream Interests [line items]
Cumulative impairment charges		338	338
Accumulated impairment [member] | Silver interests [member] | Seven hundred and seventy seven [member]
Disclosure Of Mineral Stream Interests [line items]
Cumulative impairment charges		$ 64	$ 64

Mineral Stream Interests - Clas

Mineral Stream Interests - Classification of Mining Interest (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	$ 2,920,085	$ 2,683,804
Non-Depletable	735,971	658,785
Total	3,656,056	3,342,589
Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	956,242	1,044,132
Non-Depletable	891,426	1,036,556
Total	1,847,668	2,080,688
Mineral Stream Interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	4,124,626	3,727,936
Non-Depletable	2,032,213	1,695,341
Total	6,156,839	5,423,277
Voisey's Bay [member] | Cobalt Interests [member]
Disclosure Of Mineral Stream Interests [line items]
Non-Depletable	393,422
Total	393,422
Stillwater [member] | Palladium interest [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	248,299
Non-Depletable	11,394
Total	259,693
San Dimas [member] | Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable		38,110
Non-Depletable		96,752
Total		134,862
Penasquito [member] | Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	284,194	293,968
Non-Depletable	104,528	109,282
Total	388,722	403,250
Antamina [member] | Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	353,679	380,738
Non-Depletable	356,398	376,900
Total	710,077	757,638
Constancia [member] | Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	230,983	240,950
Non-Depletable	15,248	20,853
Total	246,231	261,803
Other silver interests [member] | Silver interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	87,386	90,366
Non-Depletable	415,252	432,769
Total	502,638	523,135
Sudbury [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	308,041	315,421
Non-Depletable	58,422	64,567
Total	366,463	379,988
Salobo [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	2,171,292	2,224,133
Non-Depletable	534,768	584,599
Total	2,706,060	2,808,732
Constancia [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	108,403	112,432
Non-Depletable	9,144	9,619
Total	117,547	122,051
San Dimas [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	101,421
Non-Depletable	106,774
Total	208,195
Stillwater [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	209,569
Non-Depletable	26,863
Total	236,432
Other gold interests [member] | Gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Depletable	21,359	31,818
Total	$ 21,359	$ 31,818

Mineral Stream Interests - Addi

Mineral Stream Interests - Additional Information (Detail) $ in Thousands, oz in Millions, lb in Millions	Jul. 16, 2018USD ($)	Jun. 11, 2018USD ($)lb	May 10, 2018USD ($)shares	Dec. 31, 2018USD ($)$ / ozshares	Aug. 06, 2010oz	Oct. 15, 2004
Disclosure Of Mineral Stream Interests [line items]
Upfront cash consideration paid				$ 29,500
Restructuring of san dimas precious metal purchase agreement [member] | Silver and gold interests [member]
Disclosure Of Mineral Stream Interests [line items]
Exchange ratio description				If the average gold to silver price ratio decreases to less than 501 or increases to more than 901 for a period of 6 months or more, then the "70" shall be revised to "50" or "90", as the case may be, until such time as the average gold to silver price ratio is between 501 to 901 for a period of 6 months or more in which event the "70" shall be reinstated.
San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Cash consideration received upon disposal of mineral stream interest				$ 220,000
First Majestic [member]
Disclosure Of Mineral Stream Interests [line items]
Percentage of outstanding shares owned				11.00%
First Majestic [member] | Restructuring of san dimas precious metal purchase agreement [member]
Disclosure Of Mineral Stream Interests [line items]
Number of common shares received | shares			20,914,590
Percentage of outstanding shares owned				11.00%
First Majestic [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Number of common shares received | shares				20,914,590
Fair value of shares received				$ 151,000
Goldcorp Inc. [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Cash consideration received upon terminating silver delivery guarantee				$ 10,000
Silver interests [member] | San Dimas [member] | Restructuring of san dimas precious metal purchase agreement [member]
Disclosure Of Mineral Stream Interests [line items]
Cash consideration received upon disposal of mineral stream interest			$ 220,000
Gain on disposal of silver streaming interest			246,000
Silver interests [member] | First Majestic [member] | San Dimas [member] | Restructuring of san dimas precious metal purchase agreement [member]
Disclosure Of Mineral Stream Interests [line items]
Fair value of shares received			151,000
Silver interests [member] | Goldcorp Inc. [member] | San Dimas [member] | Restructuring of san dimas precious metal purchase agreement [member]
Disclosure Of Mineral Stream Interests [line items]
Cash consideration received upon terminating silver delivery guarantee			$ 10,000
Silver [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased					100.00%	100.00%
Number of silver ounces to be delivered before sharing mechanism applies | oz					6
Attributable Payable Production to be Purchased there after					50.00%
Silver [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				0.00%
Silver [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				0.00%
Gold [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				25.00%
Upfront cash consideration paid				$ 220,000
Percentage of silver production to be Converted to gold and purchased				25.00%
Gold to silver exchange ratio				70
Per Ounce Cash Payment | $ / oz				600
Gold [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				100.00%
Fixed payable rate	99.00%
Percentage of production	100.00%
Per ounce cash payment as a percentage of the spot price of metal delivered	18.00%			18.00%
Per ounce cash payment as a percentage of the spot price of metal delivered after upfront deposit reduced to NIL				22.00%
Gold and palladium [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Upfront cash consideration paid	$ 500,000
Palladium [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				0.00%
Palladium [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				4.50%
Fixed payable rate	99.60%
Percentage of production	4.50%			4.50%
Number of ounces to be delivered before first step down in entitlement percentage	375,000			375,000
Percentage of production to be purchased after first step down	2.25%			2.25%
Number of ounces to be delivered before second step down in entitlement percentage	550,000			550,000
Percentage of production to be purchased after second step down	1.00%			1.00%
Per ounce cash payment as a percentage of the spot price of metal delivered	18.00%			18.00%
Per ounce cash payment as a percentage of the spot price of metal delivered after upfront deposit reduced to NIL	22.00%			22.00%
Cobalt [member] | Voisey's Bay [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased		42.40%
Upfront cash consideration paid		$ 390,000
Cobalt pounds to be delivered before entitlement step down takes effect | lb		31
Percentage of metal production at the mine which WPM is entitled to after step down		21.20%
Per pound cash payment as a percentage of the spot price of metal delivered		18.00%
Percentage of spot price of metal thereafter		22.00%
Fixed payable rate		93.30%
Cobalt [member] | San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				0.00%
Cobalt [member] | Stillwater [member]
Disclosure Of Mineral Stream Interests [line items]
Attributable Payable Production to be Purchased				0.00%

Mineral Stream Interests - Disc

Mineral Stream Interests - Disclosure of Gain on Disposal of Mineral Stream Interest (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Disclosure Of Mineral Stream Interests [line items]
Gain on disposal of the San Dimas SPA	$ 245,715
San Dimas [member]
Disclosure Of Mineral Stream Interests [line items]
Cash received	220,000
Total net proceeds from the disposal of the San Dimas SPA	381,000
Less: carrying value plus closing costs	(135,285)
Gain on disposal of the San Dimas SPA	245,715
San Dimas [member] | First Majestic [member]
Disclosure Of Mineral Stream Interests [line items]
Fair value of First Majestic shares received	151,000
San Dimas [member] | Goldcorp Inc. [member]
Disclosure Of Mineral Stream Interests [line items]
Fee from Goldcorp in exchange for release from the guarantee of deliveries relative to San Dimas	$ 10,000

Impairment of Mineral Stream _3

Impairment of Mineral Stream Interests - Schedule of Impairment of Mineral Stream Interests (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Total impairment charges	$ 228,680
Silver interests [member]
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Total impairment charges	228,680
Silver interests [member] | Other silver interests [member] | Pascua-Lama [member]
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Total impairment charges	$ 228,680

Impairment of Mineral Stream _4

Impairment of Mineral Stream Interests - Additional Information (Detail) $ in Thousands, oz in Millions	12 Months Ended
	Jan. 31, 2018oz	Dec. 31, 2017USD ($)$ / oz
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Total impairment charges		$ 228,680
Silver interests [member]
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Total impairment charges		228,680
Other silver interests [member] | Silver interests [member] | Pascua-Lama [member]
Disclosure of Impairment Loss and Reversal of Impairment Loss [Line Items]
Gold reserves reclassified to gold resources | oz	14
Silver reserves reclassified to silver resources | oz	151.7
Precious metal purchase agreement carrying value		485,000
Recoverable amount		256,000
Total impairment charges		$ 228,680
Discount rate		9.00%
Inflationary factor applied on gold and silver nominal prices thereafter for the NPV methodology		2.00%
Nominal silver price per ounce used to calculate the fair value less cost of disposal of each silver interest using the NPV methodology | $ / oz		16.70

Early Deposit Mineral Stream _3

Early Deposit Mineral Stream Interests - Summary of Early Deposit Mineral Stream Interests (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Disclosure Of Mineral Stream Interests [line items]
Upfront Consideration Paid to Date	$ 29,500
Upfront Consideration to be Paid	329,000
Total Upfront Consideration	$ 358,500
Cotabambas [member]
Disclosure Of Mineral Stream Interests [line items]
Name of mine owner	Panoro
Location of Mine	Peru
Upfront Consideration Paid to Date	$ 7,000
Upfront Consideration to be Paid	133,000
Total Upfront Consideration	$ 140,000
Gold	25.00%
Silver	100.00%
Term of Agreement	Life of Mine
Toroparu [member]
Disclosure Of Mineral Stream Interests [line items]
Name of mine owner	Sandspring
Location of Mine	Guyana
Upfront Consideration Paid to Date	$ 15,500
Upfront Consideration to be Paid	138,000
Total Upfront Consideration	$ 153,500
Gold	10.00%
Silver	50.00%
Term of Agreement	Life of Mine
Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Name of mine owner	Kutcho
Location of Mine	Canada
Upfront Consideration Paid to Date	$ 7,000
Upfront Consideration to be Paid	58,000
Total Upfront Consideration	$ 65,000
Gold	100.00%
Silver	100.00%
Term of Agreement	Life of Mine

Early Deposit Mineral Stream _4

Early Deposit Mineral Stream Interests - Summary of Early Deposit Mineral Stream Interests (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018oz
Cotabambas [member]
Disclosure Of Mineral Stream Interests [line items]
Percentage of silver production at the mine which WPM is entitled to after step down	66.67%
Percentage of gold production at the mine which WPM is entitled to after step down	16.67%
Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Percentage of silver production at the mine which WPM is entitled to after step down	66.67%
Gold [member] | Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Gold ounces to be delivered before entitlement step down takes effect	51,000
Silver [member] | Cotabambas [member]
Disclosure Of Mineral Stream Interests [line items]
Silver Equivalent ounces to be delivered before entitlement step down takes effect	90,000,000
Silver [member] | Kutcho [member]
Disclosure Of Mineral Stream Interests [line items]
Silver ounces to be delivered before entitlement step down takes effect	5,600,000

Mineral Royalty Interest - Addi

Mineral Royalty Interest - Additional Information (Detail) - Metates Properties [member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Aug. 07, 2014
Disclosure Of Royalty Arrangements [line items]
Net smelter return royalty percentage	1.50%
Upfront cash payment for Royalty interest	$ 9,000,000	$ 9,000,000
Ratio of royalty which may be reacquired by the Mine Operator	66.66%
Net smelter return royalty percentage which may be repurchased	1.00%
Total consideration owed by Mine Operator upon election of reacquisition of royalty interest	$ 9,000,000
Revenues recognized in royalty agreement	0
Depletion in royalty agreement	$ 0

Investment in Associate - Addit

Investment in Associate - Additional Information (Detail) $ in Thousands, $ in Millions	Dec. 14, 2017USD ($)	Dec. 14, 2017CAD ($)	Dec. 31, 2018shares	Dec. 31, 2017USD ($)	Dec. 14, 2017CAD ($)
Disclosure of associates and joint ventures [line items]
Total consideration				$ 2,994
Amount advanced in exchange for convertible note receivable				$ (15,562)
Equity investment [member] | Kutcho [member]
Disclosure of associates and joint ventures [line items]
Number of shares of associate owned			6,153,846
Total consideration	$ 3,000	$ 4
Amount advanced in exchange for convertible note receivable	$ 16,000				$ 20
Coupon rate on convertible note receivable	10.00%				10.00%
Number of shares issued and outstanding by associate | shares			57,147,628
Fully diluted ownership percentage of associate			33.00%
Non-fully diluted potential ownership percentage of associate			40.00%
Undiluted ownership percentage of associate			11.00%
Investment in warrants [member] | Kutcho [member]
Disclosure of associates and joint ventures [line items]
Number of share purchase warrants of associate owned			3,076,923

Investment in Associate - Discl

Investment in Associate - Disclosure of Investment in Associate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of associates and joint ventures [line items]
Carrying Value	$ 2,562	$ 2,994
Share of Associates Losses Included in Net Earnings	(432)
Equity investment [member] | Kutcho [member]
Disclosure of associates and joint ventures [line items]
Carrying Value	2,562	$ 2,994
Share of Associates Losses Included in Net Earnings	$ (432)

Convertible Note Receivable - A

Convertible Note Receivable - Additional Information (Detail) $ / shares in Units, $ in Thousands, $ in Millions	Dec. 14, 2017USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 14, 2017CAD ($)$ / shares
Convertible note receivable [line items]
Amount advanced in exchange for convertible note receivable | $		$ 12,899	$ 15,777
Convertible note receivable [member] | Kutcho [member]
Convertible note receivable [line items]
Amount advanced in exchange for convertible note receivable	$ 16,000			$ 20
Coupon rate on convertible note receivable	10.00%			10.00%
Convertible note original term to maturity	7 year
Maximum interest payment deferral period	4 years
Option to defer interest payment criteria	Kutcho has the option to defer the first three interest payments until December 31, 2019, at which point one half of the deferred interest is payable in cash and the other half of the deferred interest can, at Kutcho's option, either (i) be paid in cash; or (ii) be deferred for an additional period not to exceed 4 years.
Conversion price per share | $ / shares				$ 0.8125
Minimum period required for early repayment	24 months
Prepayment cash penalty as a percentage of the outstanding loan amount if pre-paid on or after 24 months until 36 months	25.00%			25.00%
Loan amount outstanding period for covering 25% of prepayment penalty	After 24 months until 36 months
Prepayment cash penalty as a percentage of the outstanding loan amount if pre-paid on or after 36 months until 60 months	20.00%			20.00%
Loan amount outstanding period for covering 20% of prepayment penalty	After 36 months until 60 months
Prepayment cash penalty as a percentage of the outstanding loan amount if pre-paid on or after 60 months until maturity	15.00%			15.00%
Loan amount outstanding period for covering 15% of prepayment penalty	After 60 months until maturity

Convertible Note Receivable - S

Convertible Note Receivable - Schedule of Company's Convertible Note Receivable (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Convertible note receivable [abstract]
Beginning balance		$ 0
Amount advanced		15,562
Fair value gain (loss) reflected in net earnings	$ (2,878)	215
Ending balance	$ 12,899	$ 15,777

Long-Term Equity Investments -

Long-Term Equity Investments - Summary of Long-Term Equity Investments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long term investments 1 [abstract]
Long-term investments - common shares held	$ 164,753	$ 95,608
Long-term investments - warrants held		124
Long-term investments	$ 164,753	$ 95,732

Long-Term Equity Investments _2

Long-Term Equity Investments - Summary of Common Shares Held (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Long term investments - common shares held [line items]
Fair value		$ 164,753	$ 95,608
Fair value adjustment gains (losses) included in OCI	[1]	(39,985)	$ 18,552
Realized gain on disposal		$ 34,061
Bear Creek [member]
Long term investments - common shares held [line items]
Shares owned		13,264,305	13,264,305
Percentage of outstanding shares owned		13.00%	13.00%
Fair value		$ 10,112	$ 21,358
Fair value adjustment gains (losses) included in OCI		$ (11,247)	$ (1,859)
Sabina [member]
Long term investments - common shares held [line items]
Shares owned		11,700,000	11,700,000
Percentage of outstanding shares owned		4.00%	5.00%
Fair value		$ 10,549	$ 21,171
Fair value adjustment gains (losses) included in OCI		(10,622)	$ 12,631
Arizona Mining [member]
Long term investments - common shares held [line items]
Shares owned			10,000,000
Percentage of outstanding shares owned			3.00%
Fair value			$ 27,581
Fair value adjustment gains (losses) included in OCI		20,153	9,333
Realized gain on disposal		$ 34,061
First Majestic [member]
Long term investments - common shares held [line items]
Shares owned		20,914,590
Percentage of outstanding shares owned		11.00%
Fair value		$ 123,187
Fair value adjustment gains (losses) included in OCI		(27,813)
Other investments [member]
Long term investments - common shares held [line items]
Fair value		20,905	25,498
Fair value adjustment gains (losses) included in OCI		$ (10,456)	$ (1,553)
[1]	LTIs = long-term investments - common shares held.

Long-Term Equity Investments _3

Long-Term Equity Investments - Summary of Warrants Held (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long Term Investments - warrants held [line items]
Long-term investments - warrants held		$ 124
Fair value adjustment on share purchase warrants held	$ (124)	(6)
Kutcho [member]
Long Term Investments - warrants held [line items]
Long-term investments - warrants held		124
Fair value adjustment on share purchase warrants held	$ (124)	$ (6)

Long-Term Equity Investments _4

Long-Term Equity Investments - Additional Information (Detail) $ in Millions	Aug. 10, 2018USD ($)	Aug. 10, 2018CAD ($)	Jul. 17, 2018USD ($)shares	May 10, 2018USD ($)shares	Apr. 10, 2017USD ($)shares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares	Jul. 17, 2018CAD ($)shares	Apr. 25, 2018USD ($)	Oct. 31, 2017USD ($)shares
Long term investments - common shares held [line items]
Fair value						$ 164,753,000	$ 95,608,000
Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities						47,734,000
Disposition of investments, Realised gain						245,715,000
Minto derivative liability [member]
Long term investments - common shares held [line items]
Minimum market price of copper before Minto top up payment is required						2.50	$ 2.50			$ 2.50
San Dimas [member]
Long term investments - common shares held [line items]
Disposition of investments, Realised gain						245,715,000
First Majestic [member]
Long term investments - common shares held [line items]
Fair value						$ 123,187,000
Percentage of outstanding shares owned						11.00%
First Majestic [member] | San Dimas [member]
Long term investments - common shares held [line items]
Number of common shares received | shares						20,914,590
Fair value of shares received						$ 151,000,000
First Majestic [member] | Silver interests [member] | San Dimas [member]
Long term investments - common shares held [line items]
Number of common shares received | shares				20,914,590
Fair value of shares received				$ 151,000,000
Percentage of outstanding shares owned				11.00%
Tradewind Markets, Inc [member]
Long term investments - common shares held [line items]
Fair value									$ 1,000,000
Alexco [member]
Long term investments - common shares held [line items]
Number of common shares received | shares					3,000,000		3,000,000
Fair value of shares received					$ 5,000,000		$ 5,000,000
Capstone [member]
Long term investments - common shares held [line items]
Number of common shares received | shares							6,800,000			6,800,000
Fair value of shares received							$ 8,000,000
Fair value										$ 8,000,000
Adventus Zinc [member]
Long term investments - common shares held [line items]
Fair value			$ 5,000,000					$ 6
Number of shares acquired | shares			7,093,392					7,093,392
Percentage of issued and outstanding common shares			9.99%
Adventus Zinc [member] | Other intangible assets [member]
Long term investments - common shares held [line items]
Price paid for right of first refusal on new streaming agreements								$ 1
Arizona Mining Inc. [member]
Long term investments - common shares held [line items]
Other cash receipts from sales of equity or debt instruments of other entities, classified as investing activities	$ 48,000,000	$ 62
Disposition of investments, Realised gain	$ 34,000,000

Credit Facilities - Bank Debt (

Credit Facilities - Bank Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Bank Debt Facilities
Gross bank debt outstanding 1	$ 1,264,000	$ 770,000
Revolving Term Loan [member]
Disclosure Of Bank Debt Facilities
Current portion	0	0
Long-term portion	1,264,000	770,000
Gross bank debt outstanding 1	$ 1,264,000	$ 770,000

Credit Facilities - Bank Debt_2

Credit Facilities - Bank Debt (Parenthetical) (Detail) $ in Millions	Dec. 31, 2018USD ($)
Revolving Term Loan [member]
Disclosure Of Bank Debt Facilities
Unamortized debt issue	$ 6

Credit Facilities - Additional

Credit Facilities - Additional Information (Detail) $ in Thousands, $ in Millions	Feb. 27, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 15, 2018CAD ($)	Dec. 31, 2017USD ($)	Mar. 15, 2017CAD ($)	Mar. 15, 2016CAD ($)
Disclosure Of Bank Debt Facilities
Amount		$ 1,264,000		$ 770,000
Revolving Term Loan [member]
Disclosure Of Bank Debt Facilities
Information about covenants imposed by lenders on credit facilities		The Company’s Revolving Facility has financial covenants which require the Company to maintain: (i) a net debt to tangible net worth ratio of less than or equal to 0.75:1; and (ii) an interest coverage ratio of greater than or equal to 3.00:1. Only cash interest expenses are included for the purposes of calculating the interest coverage ratio. The Company is in compliance with these debt covenants as at June 30, 2018.
Maximum net debt to tangible net worth ratio		75.00%
Minimum interest coverage ratio		3
Amount		$ 1,264,000		$ 770,000
Revolving Term Loan [member] | Extension of revolving term loan [member]
Disclosure Of Bank Debt Facilities
Credit facility extension fees	$ 1,000
Maximum available credit under revolving term loan	$ 2,000,000
Revolving Term Loan [member] | Bottom of range [member]
Disclosure Of Bank Debt Facilities
Stand-by fees rate charged for undrawn facilities		0.24%
Revolving Term Loan [member] | Bottom of range [member] | LIBOR [member]
Disclosure Of Bank Debt Facilities
Basis spread		1.20%
Revolving Term Loan [member] | Bottom of range [member] | Bank of Nova Scotia Base Rate [member]
Disclosure Of Bank Debt Facilities
Basis spread		0.20%
Revolving Term Loan [member] | Top of range [member]
Disclosure Of Bank Debt Facilities
Stand-by fees rate charged for undrawn facilities		0.44%
Revolving Term Loan [member] | Top of range [member] | LIBOR [member]
Disclosure Of Bank Debt Facilities
Basis spread		2.20%
Revolving Term Loan [member] | Top of range [member] | Bank of Nova Scotia Base Rate [member]
Disclosure Of Bank Debt Facilities
Basis spread		1.20%
Letter of Guarantee in favour of Her Majesty the Queen in Right of Canada [member]
Disclosure Of Bank Debt Facilities
Annual fee associated with Letter of Credit		1.00%
Amount			$ 10		$ 11	$ 192
Letter of credit, cancellation date		Dec. 18, 2018

Credit Facilities - Summary of

Credit Facilities - Summary of Company's Finance Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Finance Cost [abstract]
Average principle outstanding during period	$ 1,005,222	$ 970,750
Average effective interest rate during period	3.57%	2.57%
Total interest expense incurred during period	$ 35,839	$ 24,993
Costs related to undrawn credit facilities	3,707	3,839
Letter of guarantee	1,641	1,567
Total finance costs	$ 41,187	$ 30,399

Issued Capital - Summary of Cap

Issued Capital - Summary of Capital Issued (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Capital and Reserve [line items]
Issued capital	$ 3,516,437	$ 3,472,029
Issued Capital [member]
Disclosure of Capital and Reserve [line items]
Issued capital	$ 3,516,437	$ 3,472,029

Issued Capital - Summary of C_2

Issued Capital - Summary of Capital Issued (Parenthetical) (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Capital and Reserve [line items]
Common shares outstanding	444,336,361	442,724,309	441,456,217
Issued Capital [member]
Disclosure of Capital and Reserve [line items]
Common shares issued	444,336,361	442,724,309
Common shares outstanding	444,336,361	442,724,309

Issued Capital - Additional Inf

Issued Capital - Additional Information (Detail)	Dec. 31, 2018$ / sharesshares
Disclosure of classes of share capital [abstract]
Par value per common share | $ / shares	$ 0
Preference shares outstanding | shares	0

Issued Capital - Summary of Com

Issued Capital - Summary of Common Shares Issued and Outstanding (Detail)	12 Months Ended
	Dec. 31, 2018$ / sharesshares	Dec. 31, 2018$ / sharesshares	Dec. 31, 2017$ / sharesshares	Dec. 31, 2017$ / sharesshares
Disclosure of classes of share capital [abstract]
Balance, shares at beginning of period	442,724,309	442,724,309	441,456,217	441,456,217
Share purchase options exercised | $ / shares	$ 24.28		$ 24.83
Restricted share units released | $ / shares		$ 0		$ 0
Dividend reinvestment plan | $ / shares		$ 18.28		$ 20.34
Share purchase options exercised	46,800	46,800	70,600	70,600
Restricted share units released	104,178	104,178	21,975	21,975
Dividend reinvestment plan	1,461,074	1,461,074	1,175,517	1,175,517
Balance, shares at end of period	444,336,361	444,336,361	442,724,309	442,724,309

Issued Capital - Summary of C_3

Issued Capital - Summary of Common Shares Issued and Outstanding (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Disclosure of classes of share capital [abstract]
Discount applied to average share price in determining number of shares to be issued under DRIP	3.00%

Issued Capital - Schedule of Di

Issued Capital - Schedule of Dividends Declared (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended		96 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Disclosure of Dividends [line items]
Dividends declared per share	$ 0.36	$ 0.33
Average number of shares eligible for dividend	443,386	441,962
Total dividends paid	$ 132,915	$ 121,934	$ 918,000
Shares issued under the DRIP	$ 1,461,074	$ 1,175,517
Cash percentage	83.00%	84.00%
DRIP percentage	17.00%	16.00%
Total dividends paid percentage	100.00%	100.00%
Retained Earnings [member]
Disclosure of Dividends [line items]
Total dividends paid	$ 159,619	$ 145,848
Dividends Paid in Cash [member]
Disclosure of Dividends [line items]
Total dividends paid	132,915	121,934
Dividends Paid in DRIP [member]
Disclosure of Dividends [line items]
Total dividends paid	$ 26,704	$ 23,914

Issued Capital - Schedule of _2

Issued Capital - Schedule of Dividends Declared (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended		96 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Disclosure of dividend [abstract]
Dividend declared	$ 132,915	$ 121,934	$ 918,000
Dividend reinvested discount rate	3.00%

Reserves - Summary of Reserves

Reserves - Summary of Reserves (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Reserves
Share purchase warrants	$ 83,077	$ 83,077
Share purchase options	31,002	28,799
Restricted share units	5,970	5,178
Long-term investment revaluation reserve, net of tax	(112,156)	(40,047)
Total reserves	$ 7,893	$ 77,007

Reserves - Summary of Share Pur

Reserves - Summary of Share Purchase Warrants (Detail) $ / shares in Units, $ in Thousands	Dec. 31, 2018USD ($)Exchange_Ratio$ / sharesshares	Dec. 31, 2017USD ($)
Disclosure of reserves within equity [abstract]
Number of warrants | shares	10,000,000
Exercise Price of Outstanding Share Purchase Warrants, Ending balance | $ / shares	$ 43.75
Exchange Ratio | Exchange_Ratio	1
Share Purchase Warrants Reserve | $	$ 83,077	$ 83,077

Reserves - Additional Informati

Reserves - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)shares	Dec. 31, 2018CAD ($)Option$ / sharesshares	Dec. 31, 2017USD ($)shares	Dec. 31, 2017CAD ($)Option$ / sharesshares	Dec. 31, 2016CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Warrant holders right to purchase common shares	Each warrant entitles the holder the right to purchase one of the Company's common shares.
Share purchase options outstanding		3,883,350		4,232,260	4,097,400
Options outstanding weighted average exercise price		$ 25.71		$ 26.71	$ 27.36
Stock Options [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Maximum term of share purchase option	Ten years
Vesting period	Two years
Trailing period for expected volatility	30 months
Description of share option grants	The Company expenses the fair value of share purchase options that are expected to vest on a straight-line basis over the vesting period using the Black-Scholes option pricing model to estimate the fair value for each option at the date of grant.
Share purchase options outstanding | Option		3,883,350		4,232,260
Options outstanding weighted average exercise price		$ 25.71		$ 26.71
Stock Options [member] | Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Description of Typical Term Of options issued	Five years
RSU [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	Two years
Number of RSU issued | shares	161,060		145,950
Weighted average fair value per RSU granted | $ / shares		$ 26.25		$ 27.39
Fair value of RSUs issued during the year	$ 3		$ 3
RSUs outstanding at reporting date | shares		370,133		313,846

Reserves - Summary of Fair Valu

Reserves - Summary of Fair Value of Share Purchase Options (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)yrshares	Dec. 31, 2018CAD ($)yr$ / sharesshares	Dec. 31, 2017USD ($)yrshares	Dec. 31, 2017CAD ($)yr$ / sharesshares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average fair value per option granted | $ / shares		$ 5.49		$ 5.85
Total fair value of options issued	$ 2,000		$ 2,000
Black-Scholes Weighted Average Assumptions [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Grant date share price and exercise price		$ 26.25		$ 27.37
Expected dividend yield	1.73%	1.73%	1.15%	1.15%
Expected volatility	35.00%	35.00%	36.00%	36.00%
Risk-free interest rate	1.91%	1.91%	0.94%	0.94%
Expected option life, in years | yr	2.5	2.5	2.5	2.5
Weighted average fair value per option granted | $ / shares		$ 5.49		$ 5.85
Number of options issued during the period | shares	549,210	549,210	508,360	508,360
Total fair value of options issued	$ 2,347		$ 2,236

Reserves - Disclosure of Inform

Reserves - Disclosure of Information About Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2018Optionyr$ / shares	Dec. 31, 2017	Dec. 31, 2016
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Total Options Outstanding	3,883,350	4,232,260	4,097,400
Options [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercisable Options | Option	3,086,030
Non-Exercisable Options	797,320
Total Options Outstanding	3,883,350
Weighted Average Remaining Contractual Life	1.5
Options [member] | 23.26 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 23.26
Exercisable Options | Option	916,800
Total Options Outstanding	916,800
Weighted Average Remaining Contractual Life	2.2
Options [member] | 24.11 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 24.11
Exercisable Options | Option	4,220
Non-Exercisable Options	4,220
Total Options Outstanding	8,440
Weighted Average Remaining Contractual Life	3.6
Options [member] | 24.45 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 24.45
Exercisable Options | Option	157,200
Total Options Outstanding	157,200
Weighted Average Remaining Contractual Life	2.2
Options [member] | 25.48 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 25.48
Exercisable Options | Option	809,150
Total Options Outstanding	809,150
Weighted Average Remaining Contractual Life	1.2
Options [member] | 25.89 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 25.89
Exercisable Options | Option	6,500
Non-Exercisable Options	6,500
Total Options Outstanding	13,000
Weighted Average Remaining Contractual Life	3.6
Options [member] | 26.07 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 26.07
Exercisable Options | Option	713,000
Total Options Outstanding	713,000
Weighted Average Remaining Contractual Life	0.2
Options [member] | 26.24 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 26.24
Non-Exercisable Options	442,770
Total Options Outstanding	442,770
Weighted Average Remaining Contractual Life	4.2
Options [member] | 27.51 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 27.51
Exercisable Options | Option	203,200
Non-Exercisable Options	203,200
Total Options Outstanding	406,400
Weighted Average Remaining Contractual Life	3.2
Options [member] | 27.58 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 27.58
Exercisable Options | Option	126,100
Total Options Outstanding	126,100
Weighted Average Remaining Contractual Life	1.2
Options [member] | 27.60 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 27.60
Exercisable Options | Option	910
Non-Exercisable Options	910
Total Options Outstanding	1,820
Weighted Average Remaining Contractual Life	3.4
Options [member] | 27.84 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 27.84
Non-Exercisable Options	100,590
Total Options Outstanding	100,590
Weighted Average Remaining Contractual Life	4.2
Options [member] | 27.96 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 27.96
Non-Exercisable Options	1,690
Total Options Outstanding	1,690
Weighted Average Remaining Contractual Life	4.4
Options [member] | 28.14 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 28.14
Exercisable Options | Option	33,700
Non-Exercisable Options	35,250
Total Options Outstanding	68,950
Weighted Average Remaining Contractual Life	3.2
Options [member] | 29.86 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 29.86
Non-Exercisable Options	2,190
Total Options Outstanding	2,190
Weighted Average Remaining Contractual Life	4.4
Options [member] | 31.74 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 31.74
Exercisable Options | Option	94,250
Total Options Outstanding	94,250
Weighted Average Remaining Contractual Life	0.2
Options [member] | 34.86 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 34.86
Exercisable Options | Option	13,000
Total Options Outstanding	13,000
Weighted Average Remaining Contractual Life	0.6
Options [member] | 39.52 [member]
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]
Exercise Price | $ / shares	$ 39.52
Exercisable Options | Option	8,000
Total Options Outstanding	8,000
Weighted Average Remaining Contractual Life	2.6

Reserves - Disclosure of Info_2

Reserves - Disclosure of Information About Options Outstanding and Exercisable (Parenthetical) (Detail)	Dec. 31, 2018ExchangeRate
Disclosure of number and weighted average remaining contractual life of outstanding share options [abstract]
Cdn$/US$ exchange rate	1.3642

Reserves - Disclosure of Share

Reserves - Disclosure of Share Purchase Options Reserve (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Share Purchase Options Reserve [line items]
Beginning balance		$ 28,799
Share purchase options exercised	[1]	(878)	$ (1,330)
Ending balance		31,002	28,799
Share Purchase Options Reserve [member]
Disclosure Of Share Purchase Options Reserve [line items]
Beginning balance		28,799	26,063
Recognition of fair value of share purchase options issued		2,401	3,037
Share purchase options exercised		(198)	(301)
Ending balance		$ 31,002	$ 28,799
[1]	Definitions as follows: "OCI" = Other Comprehensive Income (Loss); "SBC" = Equity Settled Stock Based Compensation; "Options" = Share Purchase Options; "RSUs" = Restricted Share Units; "LTI's" = Long-Term Investments; "Warrants" = Share Purchase Warrants.

Reserves - Disclosure of Outsta

Reserves - Disclosure of Outstanding Share Purchase Options (Detail)	12 Months Ended
	Dec. 31, 2018CAD ($)	Dec. 31, 2017CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Number of Options Outstanding, Beginning balance	4,232,260	4,097,400
Number of Options Outstanding, Granted	549,210	508,360
Number of Options Outstanding, Exercised	(46,800)	(70,600)
Number of Options Outstanding, Forfeited	(7,320)	(6,500)
Number of Options Outstanding, Expired	(844,000)	(296,400)
Number of Options Outstanding, Ending balance	3,883,350	4,232,260
Weighted Average Exercise Price, Beginning balance	$ 26.71	$ 27.36
Weighted Average Exercise Price, Granted	26.25	27.37
Weighted Average Exercise Price, Exercised	24.28	24.83
Weighted Average Exercise Price, Forfeited	29.24	27.51
Weighted Average Exercise Price, Expired	32.70	34.67
Weighted Average Exercise Price, Ending balance	$ 25.71	$ 26.71

Reserves - Disclosure of Outs_2

Reserves - Disclosure of Outstanding Share Purchase Options (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2018$ / shares	Dec. 31, 2017USD ($)	Dec. 31, 2017$ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Fair value per option granted | $ / shares		$ 5.49		$ 5.85
Fair value of options issued during the year | $	$ 2		$ 2

Reserves - Disclosure of Restri

Reserves - Disclosure of Restricted Share Units Reserve (Detail) - RSU [member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of restricted share units reserve [line items]
Restricted Share Units Reserve, Beginning Balance	$ 5,178	$ 3,669
Recognition of fair value of RSUs issued	3,031	2,014
Restricted share units released	(2,239)	(505)
Restricted Share Units Reserve, Ending balance	$ 5,970	$ 5,178

Reserves - Disclosure of Long T

Reserves - Disclosure of Long Term Investment Revaluation Reserve (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Long Term Investment Revaluation Reserve [line items]
Unrealized gain (loss) on LTIs	[1]	$ (42,647)	$ 17,461
Reallocate reserve to retained earnings upon disposal of LTIs		34,061
LTI revaluation reserve (net of tax) [member]
Disclosure Of Long Term Investment Revaluation Reserve [line items]
Long-term investment revaluation reserve at beginning of period		(40,047)	(57,508)
Unrealized gain (loss) on LTIs		(42,647)	17,461
Reallocate reserve to retained earnings upon disposal of LTIs		(29,462)
Long-term investment revaluation reserve at end of period		(112,156)	(40,047)
Change in Fair Value [Member] | LTI revaluation reserve (net of tax) [member]
Disclosure Of Long Term Investment Revaluation Reserve [line items]
Long-term investment revaluation reserve at beginning of period		(38,110)	(56,662)
Unrealized gain (loss) on LTIs		(39,985)	18,552
Reallocate reserve to retained earnings upon disposal of LTIs		(34,061)
Long-term investment revaluation reserve at end of period		(112,156)	(38,110)
Deferred Tax Recovery Expense [member] | LTI revaluation reserve (net of tax) [member]
Disclosure Of Long Term Investment Revaluation Reserve [line items]
Long-term investment revaluation reserve at beginning of period		(1,937)	(846)
Unrealized gain (loss) on LTIs		(2,662)	(1,091)
Reallocate reserve to retained earnings upon disposal of LTIs		$ 4,599
Long-term investment revaluation reserve at end of period			$ (1,937)
[1]	Definitions as follows: "OCI" = Other Comprehensive Income (Loss); "SBC" = Equity Settled Stock Based Compensation; "Options" = Share Purchase Options; "RSUs" = Restricted Share Units; "LTI's" = Long-Term Investments; "Warrants" = Share Purchase Warrants.

Stock Based Compensation - Perf

Stock Based Compensation - Performance Share Units - Additional Information (Detail) - PSU	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Disclosure of information relative to Performance Share Units [line items]
Number of performance share units granted		220,260	207,220
Performance share units (PSUs) [member]
Disclosure of information relative to Performance Share Units [line items]
PSUs vesting period		3 years
Number of performance share units granted		220,260	207,220
Performance share units (PSUs) [member] | Bottom of range [member]
Disclosure of information relative to Performance Share Units [line items]
Potential Performance Factors	0.00%
Performance share units (PSUs) [member] | Top of range [member]
Disclosure of information relative to Performance Share Units [line items]
Potential Performance Factors	200.00%

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of the Company's Outstanding PSUs (Detail) - PSU	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Other Equity Instruments - Performance Share Units [abstract]
Beginning balance	656,599	717,564
Granted	220,260	207,220
Dividend equivalent participation		10,304
Paid	(218,615)	(275,439)
Forfeited	(2,517)	(3,050)
Ending balance	655,727	656,599

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of the Company's Outstanding PSUs (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017
Performance share units (PSUs) [member]
Disclosure of other equity instruments [line items]
Actual performance factor achieved during completed performance period	0.00%

Earnings per Share ("EPS") an_3

Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS") - Summary of Diluted EPS Calculated Based on Weighted Average Number of Shares Outstanding (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [line items]
Basic weighted average number of shares outstanding	443,407	441,961
Diluted weighted average number of shares outstanding	443,862	442,442
Share purchase options [member]
Earnings per share [line items]
Restricted share units	81	197
Restricted stock units [member]
Earnings per share [line items]
Restricted share units	374	284

Earnings per Share ("EPS") an_4

Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS") - Additional Information (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [abstract]
Average market value of common shares	$ 25.32	$ 26.54

Earnings per Share ("EPS") an_5

Earnings per Share ("EPS") and Diluted Earnings per Share ("Diluted EPS") - Summary of Share Purchase Options and Share Purchase Warrants Excluded From Computation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings per share [line items]
Share options not included in calculation of diluted earnings per share	12,801	11,372
Share purchase options [member]
Earnings per share [line items]
Share options not included in calculation of diluted earnings per share	2,801	1,372
Share purchase warrants [member]
Earnings per share [line items]
Share options not included in calculation of diluted earnings per share	10,000	10,000

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Summary of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Change in non-cash working capital
Accounts receivable	$ 828	$ (729)
Accounts payable and accrued liabilities	7,977	(5,398)
Other	159	(219)
Total change in non-cash working capital	$ 8,964	$ (6,346)

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Apr. 10, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Oct. 31, 2017
Disclosure of cash flow statement [line items]
Dividends declared per share		$ 0.36	$ 0.33
Total dividends paid		$ 132,915	$ 121,934	$ 918,000
DRIP percentage		17.00%	16.00%
Retained Earnings [member]
Disclosure of cash flow statement [line items]
Total dividends paid		$ 159,619	$ 145,848
Dividends Paid in Cash [member]
Disclosure of cash flow statement [line items]
Total dividends paid		132,915	121,934
Dividends Paid in DRIP [member]
Disclosure of cash flow statement [line items]
Total dividends paid		$ 26,704	$ 23,914
Alexco [member]
Disclosure of cash flow statement [line items]
Number of common shares received	3,000,000		3,000,000
Fair value of shares received	$ 5,000		$ 5,000
Capstone [member]
Disclosure of cash flow statement [line items]
Number of common shares received			6,800,000		6,800,000
Fair value of shares received			$ 8,000
First Majestic [member] | San Dimas [member]
Disclosure of cash flow statement [line items]
Number of common shares received		20,914,590		20,914,590
Fair value of shares received		$ 151,000

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Expense (Recovery) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income tax [line items]
Reversal of previously recognized differences	$ (5,393)	$ (4,814)
Total deferred income tax recovery from operations	4,552	(1,212)
Income tax expense (recovery)	15,868	(886)
Foreign jurisdictions [member]
Income tax [line items]
Current income tax expense related to CRA Settlement	86	326
CRA [member]
Income tax [line items]
Origination and reversal of temporary differences	841	3,602
Reversal of previously recognized differences	(5,393)	(4,814)
Total deferred income tax recovery from operations	(4,552)	(1,212)
Income tax expense (recovery)	(4,466)	$ (886)
Impact of CRA Settlement [member] | CRA [member]
Income tax [line items]
Current income tax expense related to CRA Settlement	4,020
Reversal of previously recognized differences	3,848
Income tax expense offset by previously unrecognized non-capital losses recognized through Equity	12,466
Income tax expense (recovery)	$ 20,334

Income Taxes - Schedule of In_2

Income Taxes - Schedule of Income Tax Expense (Recovery) (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
2005 - 2017 taxation year [member] | Impact of CRA Settlement [member]
Income tax [line items]
Non-tax effected deductible temporary differences which gave rise to a deferred tax asset being recognized	$ 18

Income Taxes - Schedule of In_3

Income Taxes - Schedule of Income Tax Recognized as Component of OCI (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Income tax relating to components of other comprehensive income [abstract]
Income tax expense (recovery) related to LTIs - common shares held		$ 2,662	$ 1,091
Income tax expense (recovery) recognized in OCI	[1]	$ 2,662	$ 1,091
[1]	LTIs = long-term investments - common shares held.

Income Taxes - Schedule of In_4

Income Taxes - Schedule of Income Tax Recognized Directly in Equity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current and deferred tax relating to items charged or credited directly to equity [line items]
Income tax expense (recovery) from operations	$ (14,389)	$ (65)
Origination and reversal of temporary differences [member]
Current and deferred tax relating to items charged or credited directly to equity [line items]
Income tax expense (recovery) from operations	1,078
Write-down of previously recognized temporary differences [member]
Current and deferred tax relating to items charged or credited directly to equity [line items]
Income tax expense (recovery) from operations	(3,001)	(65)
Income Tax Recovery [member]
Current and deferred tax relating to items charged or credited directly to equity [line items]
Income tax expense (recovery) from operations	(1,923)	$ (65)
Impact of CRA Settlement [member] | 2005 - 2017 taxation year [member]
Current and deferred tax relating to items charged or credited directly to equity [line items]
Income tax expense (recovery) recognized in equity	$ (12,466)

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Earnings before income taxes	$ 442,983	$ 56,817
Canadian federal and provincial income tax rates	27.00%	26.00%
Income tax expense based on above rates	$ 119,605	$ 14,772
Non-deductible stock based compensation and other	4,676	2,206
Differences in tax rates in foreign jurisdictions	(133,361)	(16,605)
Impact of tax rate changes		(47)
Impact of CRA Settlement	20,334
Current period unrecognized temporary differences	10,007	3,602
Write down (reversal of write down) of previously recognized temporary differences	(5,393)	(4,814)
Income tax expense (recovery)	$ 15,868	$ (886)

Income Taxes - Schedule of Pr_2

Income Taxes - Schedule of Provision for Income Taxes (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
BC corporate tax rate in 2017	11.00%
BC corporate tax rate starting in 2018	12.00%
Combined statutory tax rate for years 2018 and beyond	27.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) $ in Millions, $ in Millions	Dec. 13, 2018	Sep. 24, 2015CAD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018CAD ($)
Income tax [line items]
Name of subsidiary			Wheaton Precious Metals International Ltd.	Wheaton Precious Metals International Ltd.
Proportion of ownership interest in subsidiary			100.00%	100.00%
Canada [member]
Income tax [line items]
Capital losses			$ 29
2038 expiration [member] | Canada [member]
Income tax [line items]
Non Capital Losses			41
Canada revenue agency [member] | 2005-2010 taxation year [member]
Income tax [line items]
Reassessment penalities		$ 353
Percentage of assessed tax required to be deposited		50.00%
Letters of guarantee as security		$ 213
Details and Impact of CRA Settlement [member]
Income tax [line items]
Revised mark up on cost of services provided to subsidiaries after CRA settlement	30.00%
Increase in capital raising costs current	20.00%
Impact of CRA Settlement [member] | 2005 - 2017 taxation year [member]
Income tax [line items]
Current Tax Expense related to CRA settlement			4	$ 5.5
Interest and penalties related to CRA settlement			4.3	$ 5.9
Income tax expense offset by previously unrecognized tax loss credited directly to equity			$ 12

Income Taxes - Deferred Income

Income Taxes - Deferred Income Tax Assets and Liabilities Recognized (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets And Liabilities [line items]
Opening Balance		$ (76)	$ (262)
Recovery (Expense) Recognized In Net Earnings		(4,552)	1,212
Recovery (Expense) Recognized In OCI	[1]	(2,662)	(1,091)
Recovery (Expense) Recognized In Shareholders' Equity		14,389	65
Closing Balance		(111)	(76)
Non-capital loss carryforwards [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		3,848	3,508
Recovery (Expense) Recognized In Net Earnings		(2,057)	299
Recovery (Expense) Recognized In Shareholders' Equity		2,032	41
Closing Balance		3,823	3,848
Capital losses carryforward [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		1,965	846
Recovery (Expense) Recognized In Net Earnings		2,633	1,119
LTI Disposition		(4,598)
Closing Balance			1,965
Deferred tax assets other [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		147	43
Recovery (Expense) Recognized In Net Earnings		240	104
Closing Balance		387	147
Interest capitalized for accounting [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(87)	(84)
Recovery (Expense) Recognized In Net Earnings			(3)
Closing Balance		(87)	(87)
Debt and share financing fees [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(375)	173
Recovery (Expense) Recognized In Net Earnings		(107)	(572)
Recovery (Expense) Recognized In Shareholders' Equity		(109)	24
Closing Balance		(591)	(375)
Kutcho convertible note [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(29)
Recovery (Expense) Recognized In Net Earnings		29	(29)
Closing Balance			(29)
Unrealized gains on long term investments [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(1,937)	(846)
Recovery (Expense) Recognized In Net Earnings		1
LTI Disposition		4,598
Recovery (Expense) Recognized In OCI		(2,662)	(1,091)
Closing Balance			(1,937)
Mineral stream interest [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(3,532)	(3,640)
Recovery (Expense) Recognized In Net Earnings			108
Closing Balance		(3,532)	(3,532)
Foreign withholding tax [member]
Deferred Tax Assets And Liabilities [line items]
Opening Balance		(76)	(262)
Recovery (Expense) Recognized In Net Earnings		(35)	186
Closing Balance		$ (111)	$ (76)
[1]	LTIs = long-term investments - common shares held.

Income Taxes - Deferred Incom_2

Income Taxes - Deferred Income Tax Assets and Liabilities Recognized (Parenthetical) (Detail) $ in Millions	Dec. 31, 2018USD ($)
Deferred tax assets and liabilities [abstract]
Non-tax effected deductible temporary differences which gave rise to a deferred tax asset being recognized	$ 14

Income Taxes -Schedule of Defer

Income Taxes -Schedule of Deferred Income Tax Assets Unrecognized (Detail) - Canada [member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Unrecognized deferred tax assets [line items]
Deferred tax assets	$ 107,334	$ 129,903
Non-capital losses [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	7,209	32,388
Financing fees [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	4,474	7,451
Mineral stream interest [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	67,717	70,514
Deferred tax assets other [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	3,656	1,366
Capital losses [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	7,723	10,356
Convertible note receivable [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	648
Unrealized losses on long term investments [member]
Unrecognized deferred tax assets [line items]
Deferred tax assets	$ 15,907	$ 7,828

Income Taxes -Schedule of Def_2

Income Taxes -Schedule of Deferred Income Tax Assets Unrecognized (Parenthetical) (Detail) - Canada [member] $ in Millions	Dec. 31, 2018USD ($)
Non-capital losses [member]
Unrecognized deferred tax assets [line items]
Non-tax effected deductible temporary differences for which no deferred tax asset is recognized	$ 27
Capital losses [member]
Unrecognized deferred tax assets [line items]
Non-tax effected deductible temporary differences for which no deferred tax asset is recognized	$ 29

Related Party Transactions - Sc

Related Party Transactions - Schedule of Key Management Personnel Compensation, Including Directors (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Short-term benefits	$ 7,402	$ 6,836
Post-employment benefits	56	55
Equity settled stock based compensation (a non-cash expense)	3,559	3,427
Total executive compensation	17,018	10,346
Performance share units (PSUs) [member]
Disclosure of transactions between related parties [line items]
Equity settled stock based compensation (a non-cash expense)	$ 6,001	$ 28

Related Party Transactions - _2

Related Party Transactions - Schedule of Key Management Personnel Compensation, Including Directors (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Vesting period of performance share units	3 years

Post-Employment Benefit Costs -

Post-Employment Benefit Costs - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of defined contribution retirement savings plan [abstract]
Percentage of Registered Retirement Savings Plan contribution limit	50.00%	50.00%
Percentage of employee salary eligible for Registered Retirement Savings Plan contribution	9.00%	9.00%
Employer contributions to group RRSP	$ 226,000	$ 211,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Commitments to Purchase Mineral Stream (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)$ / oz
Penasquito [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Jul. 24, 2007
Penasquito [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Penasquito [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	25.00%
Per Unit of Measurement Cash Payment	4.21
Penasquito [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Penasquito [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Constancia [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Aug. 8, 2012
Constancia [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	50.00%
Per Unit of Measurement Cash Payment	400
Constancia [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	5.90
Constancia [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Constancia [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Salobo [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Feb. 28, 2013
Salobo [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	75.00%
Per Unit of Measurement Cash Payment	404
Salobo [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Salobo [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Salobo [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Sudbury [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	20 years
Date of Original Contract	Feb. 28, 2013
Sudbury [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	70.00%
Per Unit of Measurement Cash Payment	400
Sudbury [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Sudbury [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Sudbury [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Nov. 3, 2015
Antamina [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Antamina [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	33.75%
Antamina [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Antamina [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	May 10, 2018
San Dimas [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased, description	variable
Percentage of production to be purchased	25.00%
Per Unit of Measurement Cash Payment | $ / oz	600
San Dimas [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
San Dimas [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
San Dimas [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Stillwater [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Jul. 16, 2018
Stillwater [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	100.00%
Stillwater [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Stillwater [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	4.50%
Stillwater [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Voisey's Bay [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Jun. 11, 2018
Voisey's Bay [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Voisey's Bay [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Voisey's Bay [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Voisey's Bay [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	42.40%
Los Filos [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	25 years
Date of Original Contract	Oct. 15, 2004
Los Filos [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Los Filos [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	4.39
Los Filos [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Los Filos [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Zinkgruvan [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Dec. 8, 2004
Zinkgruvan [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Zinkgruvan [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	4.39
Zinkgruvan [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Zinkgruvan [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Mar. 23, 2006
Yauliyacu [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Yauliyacu [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	8.85
Yauliyacu [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Yauliyacu [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Stratoni [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Apr. 23, 2007
Stratoni [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Stratoni [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	6.77
Stratoni [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Stratoni [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Neves-Corvo [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	50 years
Date of Original Contract	Jun. 5, 2007
Neves-Corvo [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Neves-Corvo [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	4.26
Neves-Corvo [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Neves-Corvo [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	50 years
Date of Original Contract	Jun. 5, 2007
Aljustrel [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Aljustrel [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	100.00%
Aljustrel [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Aljustrel [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Minto [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Nov. 20, 2008
Minto [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	325
Minto [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	4.22
Minto [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Minto [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Keno Hill [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Oct. 2, 2008
Keno Hill [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Keno Hill [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	25.00%
Keno Hill [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Keno Hill [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Pascua-Lama [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Sep. 8, 2009
Pascua-Lama [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Pascua-Lama [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	25.00%
Per Unit of Measurement Cash Payment	3.90
Pascua-Lama [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Pascua-Lama [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Rosemont [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Feb. 10, 2010
Rosemont [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	450
Rosemont [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	3.90
Rosemont [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Rosemont [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
777 [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Aug. 8, 2012
777 [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	50.00%
Per Unit of Measurement Cash Payment	416
777 [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	6.14
777 [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
777 [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Toroparu [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Nov. 13, 2013
Toroparu [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	10.00%
Per Unit of Measurement Cash Payment	400
Toroparu [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	50.00%
Per Unit of Measurement Cash Payment	3.90
Toroparu [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Toroparu [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Mar. 21, 2016
Cotabambas [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	25.00%
Per Unit of Measurement Cash Payment	450
Cotabambas [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	100.00%
Per Unit of Measurement Cash Payment	5.90
Cotabambas [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Cotabambas [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Date of Original Contract	Dec. 12, 2017
Kutcho [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	100.00%
Kutcho [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	variable
Percentage of production to be purchased	100.00%
Kutcho [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Kutcho [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Loma de La Plata [member]
Disclosure of contractual obligations and commitments [line items]
Term of Agreement	Life of Mine
Loma de La Plata [member] | Gold [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Loma de La Plata [member] | Silver [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased	12.50%
Per Unit of Measurement Cash Payment	4
Loma de La Plata [member] | Palladium [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%
Loma de La Plata [member] | Cobalt [member]
Disclosure of contractual obligations and commitments [line items]
Per Unit of Measurement Cash Payment, description	n/a
Percentage of production to be purchased	0.00%

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Commitments to Purchase Mineral Stream (Parenthetical) (Detail) lb in Millions	Jul. 16, 2018	Jul. 01, 2018	Dec. 31, 2018USD ($)$ / ozozlb
Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Minimum market price of silver on a per ounce basis before top up payment is required | $ / oz			20
Maximum market price of silver on a per ounce basis before top up payment is capped | $ / oz			40
Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Maximum percentage of copper included in concentrate			15.00%
Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Cumulative silver equivalent ounces to be produced before reduction in stream percentage | oz			90,000,000
Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Per ounce cash payment as a percentage of the spot price of metal delivered			20.00%
Constancia and 777 [member]
Disclosure of contractual obligations and commitments [line items]
Initial term of contract			40 years
Silver interests [member] | Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Per ounce cash payment as a percentage of the spot price of metal delivered			20.00%
Gold interests [member] | San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			25.00%
Percentage of silver production to be Converted to gold and purchased			25.00%
Gold to silver exchange ratio			70
Gold to silver price ratio minimum limit for revisiting stated exchange rate			50
Gold to silver price ratio maximum limit for revisiting stated exchange rate			90
Exchange ratio to be fixed when price ratio reach minimum limit for six months			50
Exchange ratio to be fixed when price ratio reach maximum limit for six months			90
Gold to silver exchange ratio, description			If the average gold to silver price ratio decreases to less than 50:1 or increases to more than 90:1 for a period of 6 months or more, then the “70” shall be revised to “50” or “90”, as the case may be, until such time as the average gold to silver price ratio is between 50:1 to 90:1 for a period of 6 months or more in which event the “70” shall be reinstated.
Gold interests [member] | Minto [member]
Disclosure of contractual obligations and commitments [line items]
Minimum market price of copper before Minto top up payment is required | $ / oz			2.50
Gold [member] | Constancia [member]
Disclosure of contractual obligations and commitments [line items]
Fixed rate gold recoveries			55.00%
Percentage of production to be purchased			50.00%
Per Ounce Cash Payment			400
Gold [member] | Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Gold [member] | San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			25.00%
Percentage of silver production to be Converted to gold and purchased			25.00%
Gold to silver exchange ratio			70
Per Ounce Cash Payment | $ / oz			600
Gold [member] | Stillwater [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Percentage of production	100.00%
Per ounce cash payment as a percentage of the per ounce price received related to metal delivered	18.00%		18.00%
Balance of upfront cash deposit required for price change to take place			$ 0
Per ounce cash payment as a percentage of the spot price of metal delivered after upfront deposit reduced to NIL			22.00%
Gold [member] | Voisey's Bay [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Gold [member] | Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Gold [member] | Stratoni [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Gold [member] | Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Gold [member] | Minto [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Number of ounces to be delivered before sharing mechanism applies | oz			30,000
Attributable Payable Production to be Purchased there after			50.00%
Per Ounce Cash Payment			325
Gold [member] | Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			25.00%
Attributable Payable Production to be Purchased after stream percentage reduction			16.67%
Per Ounce Cash Payment			450
Gold [member] | Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Attributable Payable Production to be Purchased after stream percentage reduction			66.67%
Cumulative gold ounces to be delivered before reduction in stream percentage | oz			51,000
Gold [member] | Constancia deposit at constancia mine [member]
Disclosure of contractual obligations and commitments [line items]
Fixed rate gold recoveries			55.00%
Gold [member] | Pampacancha deposit at constancia mine [member]
Disclosure of contractual obligations and commitments [line items]
Fixed rate gold recoveries			70.00%
The end of fixed rate recoveries | oz			265,000
Gold [member] | Constancia and 777 [member]
Disclosure of contractual obligations and commitments [line items]
Price per ounce after the initial 40 year term | $ / oz			550
Silver [member] | Constancia [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Per Ounce Cash Payment			5.90
Silver [member] | Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			33.75%
Silver [member] | San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Silver [member] | Stillwater [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Silver [member] | Voisey's Bay [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Silver [member] | Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Price floor on a per ounce basis			4.35
Percentage of production to be purchased			100.00%
Number of silver ounces to be delivered before sharing mechanism applies | oz			1,500,000
Top up payment to be paid on a per ounce basis as a percentage of the difference between the actual price per ounce and the Minimum price per ounce			50.00%
Purchase commitments percentage			50.00%
Minimum market price of silver on a per ounce basis before top up payment is required | $ / oz			20
Per Ounce Cash Payment			8.85
Maximum top up payment | $ / oz			10
Price cap on a per ounce basis | $ / oz			18.85
Silver [member] | Stratoni [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Per Ounce Cash Payment			6.77
Area of drilling completed level 1			10,000
Area of drilling completed level 2			20,000
Area of drilling completed level 3			30,000
Top up payment on a per ounce basis - level 1			2.50
Top up payment on a per ounce basis - level 2			5
Top up payment on a per ounce basis - level 3			7
Area of drilling completed		10,000
Silver [member] | Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Per ounce cash payment as a percentage of the per ounce price received related to metal delivered			50.00%
Period that payable rates are fixed			2 years
Silver [member] | Minto [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Per Ounce Cash Payment			4.22
Silver [member] | Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Attributable Payable Production to be Purchased after stream percentage reduction			66.67%
Per Ounce Cash Payment			5.90
Silver [member] | Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			100.00%
Attributable Payable Production to be Purchased after stream percentage reduction			66.67%
Cumulative silver ounces to be delivered before reduction in stream percentage | oz			5,600,000
Silver [member] | Constancia and 777 [member]
Disclosure of contractual obligations and commitments [line items]
Price per ounce after the initial 40 year term | $ / oz			9.90
Palladium [member] | Constancia [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Stillwater [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			4.50%
Percentage of production	4.50%		4.50%
Number of ounces to be delivered before first step down in entitlement percentage	375,000		375,000
Percentage of production to be purchased after first step down	2.25%		2.25%
Number of ounces to be delivered before second step down in entitlement percentage	550,000		550,000
Percentage of production to be purchased after second step down	1.00%		1.00%
Per ounce cash payment as a percentage of the per ounce price received related to metal delivered	18.00%		18.00%
Balance of upfront cash deposit required for price change to take place			$ 0
Per ounce cash payment as a percentage of the spot price of metal delivered after upfront deposit reduced to NIL	22.00%		22.00%
Palladium [member] | Voisey's Bay [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Stratoni [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Minto [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Palladium [member] | Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Constancia [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Antamina [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | San Dimas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Stillwater [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Voisey's Bay [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			42.40%
Per ounce cash payment as a percentage of the per ounce price received related to metal delivered			18.00%
Balance of upfront cash deposit required for percentage entitlement step down to take place			$ 0
Per ounce cash payment as a percentage of the spot price of metal delivered after upfront deposit reduced to NIL			22.00%
Cobalt pounds to be delivered before entitlement step down takes effect | lb			31
Percentage of metal production at the mine which WPM is entitled to after step down			21.20%
Cobalt [member] | Yauliyacu [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Stratoni [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Aljustrel [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Minto [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Cotabambas [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%
Cobalt [member] | Kutcho [member]
Disclosure of contractual obligations and commitments [line items]
Percentage of production to be purchased			0.00%

Commitments and Contingencies_3

Commitments and Contingencies - Summary of Other Contractual Obligations and Contingencies (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Disclosure of contractual obligations [line items]
Total contractual obligations	$ 2,102,890
Bank debt [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,264,000
Interest expense [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	242,555
Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	3,785
Rosemont [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	231,150
Loma de La Plata [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	32,400
Toroparu [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	138,000
Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	133,000
Kutcho [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	58,000
2019 [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	56,134
2019 [member] | Interest expense [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	53,845
2019 [member] | Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	789
2019 [member] | Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,500
2022 - 2023 [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,312,617
2022 - 2023 [member] | Bank debt [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,264,000
2022 - 2023 [member] | Interest expense [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	46,541
2022 - 2023 [member] | Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,076
2022 - 2023 [member] | Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,000
2019 - 2021 [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	148,365
2019 - 2021 [member] | Interest expense [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	142,169
2019 - 2021 [member] | Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,696
2019 - 2021 [member] | Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	4,500
After 2023 [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	224
After 2023 [member] | Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	224
Sub-Total [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,517,340
Sub-Total [member] | Bank debt [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	1,264,000
Sub-Total [member] | Interest expense [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	242,555
Sub-Total [member] | Operating leases [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	3,785
Sub-Total [member] | Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	7,000
No scheduled due date [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	585,550
No scheduled due date [member] | Rosemont [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	231,150
No scheduled due date [member] | Loma de La Plata [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	32,400
No scheduled due date [member] | Toroparu [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	138,000
No scheduled due date [member] | Cotabambas [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	126,000
No scheduled due date [member] | Kutcho [member] | Mineral stream interest payments [member]
Disclosure of contractual obligations [line items]
Total contractual obligations	$ 58,000

Commitments and Contingencies_4

Commitments and Contingencies - Summary of Other Contractual Obligations and Contingencies (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of contractual obligations [line items]
Outstanding on the Revolving Facility	$ 1,264,000	$ 770,000
2022 - 2023 [member] | Bank debt [member]
Disclosure of contractual obligations [line items]
Outstanding on the Revolving Facility	1,300,000
No scheduled due date [member] | Rosemont [member]
Disclosure of contractual obligations [line items]
Contingent transaction costs	$ 1,000

Commitments and Contingencies_5

Commitments and Contingencies - Additional Information (Detail) Tonnes_Per_Day in Millions	Feb. 08, 2019USD ($)	Dec. 31, 2018USD ($)MillionTonnesPerAnnumTonnes_Per_Day
Disclosure of contingent liabilities [line items]
Upfront cash consideration to be paid		$ 329,000,000
Upfront cash consideration paid to date		29,500,000
Reassessment interest and penalties		$ 1,000,000
Percentage of reassessments interest and penalties		50.00%
Decrease in reassessment interest and penalties		$ 2,000,000
2014-2018 taxation year [member]
Disclosure of contingent liabilities [line items]
Potential estimated cash taxes, interest and penalties		$ 2,000,000
Canada [member]
Disclosure of contingent liabilities [line items]
Relevant years		2014 to 2018 taxation years
Loma de La Plata [member]
Disclosure of contingent liabilities [line items]
Upfront cash consideration to be paid		$ 32,000,000
Rosemont [member] | Entering Into Significant Commitments or Contingent Liabilities [Member]
Disclosure of contingent liabilities [line items]
Upfront cash consideration to be paid	$ 230,000,000
First installment payable on permitting projet	50,000,000
Balance installment amount payable once project costs incurred exceeds specified amount	180,000,000
Project costs incurred to trigger balance installment payable	$ 98,000,000
Toroparu [member]
Disclosure of contingent liabilities [line items]
Upfront cash consideration to be paid		$ 138,000,000
Reduced stream percentage of gold		0.909%
Current stream percentage of gold		10.00%
Current stream percentage of silver		50.00%
Reduced stream percentage of silver		2.00%
Amount of non-refundable advance		$ 2,000,000
Cotabambas [member]
Disclosure of contingent liabilities [line items]
Total upfront cash payment for early deposit silver streaming interest		140,000,000
Upfront cash consideration paid to date		7,000,000
Unpaid upfront cash consideration with scheduled payment dates		7,000,000
Cash not returned on discontinuing precious metal purchase agreement		$ 2,000,000
Option repurchase precious metal stream, percentage		50.00%
Kutcho [member]
Disclosure of contingent liabilities [line items]
Total upfront cash payment for early deposit silver streaming interest		$ 65,000,000
Upfront cash consideration paid to date		7,000,000
Unpaid upfront cash consideration with no scheduled payment dates		58,000,000
Additional upfront consideration		$ 20,000,000
Mill throughput capacity | Tonnes_Per_Day		4,500
Additional payment condition		If processing throughput is increased to 4,500 tonnes per day or more within 5 years of attaining commercial production.
Salobo [member]
Disclosure of contingent liabilities [line items]
Mill throughput capacity | MillionTonnesPerAnnum		24
Salobo [member] | Bottom of range [member] | Mill Throughput Capacity Expansion [member]
Disclosure of contingent liabilities [line items]
Additional payment condition		Expansion payment due If throughput is expanded beyond 28 Mtpa by January 1, 2036.
Expanded Mill throughput capacity | MillionTonnesPerAnnum		28
Estimated expansion payments		$ 113,000,000
Salobo [member] | Bottom of range [member] | Mill Throughput Capacity Expansion [member] | Salobo Three Expansion [member]
Disclosure of contingent liabilities [line items]
Estimated expansion payments		$ 550,000,000
Salobo [member] | Top of range [member] | Mill Throughput Capacity Expansion [member]
Disclosure of contingent liabilities [line items]
Additional payment condition		Expansion payment due If throughput is expanded beyond40 Mtpa by January 1, 2021.
Expanded Mill throughput capacity | MillionTonnesPerAnnum		40
Estimated expansion payments		$ 953,000,000
Salobo [member] | Top of range [member] | Mill Throughput Capacity Expansion [member] | Salobo Three Expansion [member]
Disclosure of contingent liabilities [line items]
Estimated expansion payments		$ 650,000,000

Segmented Information - Schedul

Segmented Information - Schedule of Operating Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of operating segments [line items]
Sales	$ 794,012	$ 843,215
Cost of sales, excluding depletion	245,794	243,801
Depletion	252,287	262,380
Gross margin	295,931	337,034
Impairment charges		228,680
Net earnings	427,115	57,703
Cash Flow From Operations	477,413	538,808
Total Assets	6,470,046	5,683,313
General and administrative material reconciling items [member]
Disclosure of operating segments [line items]
Net earnings	(51,650)	(34,673)
Cash Flow From Operations	(29,509)	(30,298)
Finance costs material reconciling items [member]
Disclosure of operating segments [line items]
Net earnings	(41,187)	(30,399)
Cash Flow From Operations	(40,363)	(29,570)
Other material reconciling Items [member]
Disclosure of operating segments [line items]
Net earnings	(5,826)	13,535
Cash Flow From Operations	1,403	5,874
Income tax recovery material reconciling items [member]
Disclosure of operating segments [line items]
Net earnings		886
Cash Flow From Operations		(579)
Aggregate material reconciling items [member]
Disclosure of operating segments [line items]
Net earnings	131,184	(50,651)
Cash Flow From Operations	(69,429)	(54,573)
Total Assets	313,207	260,036
Gain on disposal of the san dimas spa [member]
Disclosure of operating segments [line items]
Net earnings	245,715
Income tax expense material reconciling items[member]
Disclosure of operating segments [line items]
Net earnings	(15,868)
Cash Flow From Operations	(960)
Gold interests [member]
Disclosure of operating segments [line items]
Sales	441,193	423,941
Cost of sales, excluding depletion	142,728	133,165
Depletion	146,319	140,684
Gross margin		150,092
Net earnings	152,146	150,092
Cash Flow From Operations	297,016	287,045
Total Assets	3,656,056	3,342,589
Gold interests [member] | Sudbury [member]
Disclosure of operating segments [line items]
Sales	21,785	35,253
Cost of sales, excluding depletion	6,804	11,202
Depletion	13,525	21,547
Gross margin		2,504
Net earnings	1,456	2,504
Cash Flow From Operations	14,959	24,042
Total Assets	366,463	379,988
Gold interests [member] | Salobo [member]
Disclosure of operating segments [line items]
Sales	336,474	317,596
Cost of sales, excluding depletion	106,347	100,946
Depletion	102,672	96,103
Gross margin		120,547
Net earnings	127,455	120,547
Cash Flow From Operations	230,126	216,650
Total Assets	2,706,060	2,808,732
Gold interests [member] | Constancia [member]
Disclosure of operating segments [line items]
Sales	15,259	11,125
Cost of sales, excluding depletion	4,818	3,537
Depletion	4,504	3,619
Gross margin		3,969
Net earnings	5,937	3,969
Cash Flow From Operations	10,441	7,575
Total Assets	117,547	122,051
Gold interests [member] | Other gold interests [member]
Disclosure of operating segments [line items]
Sales	33,955	59,967
Cost of sales, excluding depletion	10,367	17,480
Depletion	10,459	19,415
Gross margin		23,072
Net earnings	13,129	23,072
Cash Flow From Operations	22,162	38,778
Total Assets	21,359	31,818
Gold interests [member] | San Dimas [member]
Disclosure of operating segments [line items]
Sales	26,943
Cost of sales, excluding depletion	13,177
Depletion	12,234
Net earnings	1,532
Cash Flow From Operations	13,766
Total Assets	208,195
Gold interests [member] | Stillwater [member]
Disclosure of operating segments [line items]
Sales	6,777
Cost of sales, excluding depletion	1,215
Depletion	2,925
Net earnings	2,637
Cash Flow From Operations	5,562
Total Assets	236,432
Silver interests [member]
Disclosure of operating segments [line items]
Sales	343,579	419,274
Cost of sales, excluding depletion	101,410	110,636
Depletion	101,935	121,696
Gross margin		186,942
Impairment charges		228,680
Net earnings	140,234	(41,738)
Cash Flow From Operations	242,242	306,336
Total Assets	1,847,668	2,080,688
Silver interests [member] | Constancia [member]
Disclosure of operating segments [line items]
Sales	34,082	33,026
Cost of sales, excluding depletion	12,863	11,353
Depletion	15,572	14,168
Gross margin		7,505
Net earnings	5,647	7,505
Cash Flow From Operations	21,219	21,470
Total Assets	246,231	261,803
Silver interests [member] | San Dimas [member]
Disclosure of operating segments [line items]
Sales	40,594	65,677
Cost of sales, excluding depletion	10,549	16,790
Depletion	3,575	5,713
Gross margin		43,174
Net earnings	26,470	43,174
Cash Flow From Operations	30,045	48,887
Total Assets		134,862
Silver interests [member] | Penasquito [member]
Disclosure of operating segments [line items]
Sales	77,691	87,906
Cost of sales, excluding depletion	20,501	20,856
Depletion	14,528	14,827
Gross margin		52,223
Net earnings	42,662	52,223
Cash Flow From Operations	57,190	67,050
Total Assets	388,722	403,250
Silver interests [member] | Antamina [member]
Disclosure of operating segments [line items]
Sales	86,408	100,617
Cost of sales, excluding depletion	17,265	20,183
Depletion	47,561	58,168
Gross margin		22,266
Net earnings	21,582	22,266
Cash Flow From Operations	69,143	80,434
Total Assets	710,077	757,638
Silver interests [member] | Other silver interests [member]
Disclosure of operating segments [line items]
Sales	104,804	132,048
Cost of sales, excluding depletion	40,232	41,454
Depletion	20,699	28,820
Gross margin		61,774
Impairment charges		228,680
Net earnings	43,873	(166,906)
Cash Flow From Operations	64,645	88,495
Total Assets	502,638	523,135
Mineral Stream Interests [member]
Disclosure of operating segments [line items]
Sales	794,012	843,215
Cost of sales, excluding depletion	245,794	243,801
Depletion	252,287	262,380
Gross margin		337,034
Impairment charges		228,680
Net earnings	295,931	108,354
Cash Flow From Operations	546,842	593,381
Total Assets	6,156,839	$ 5,423,277
Palladium interest [member] | Stillwater [member]
Disclosure of operating segments [line items]
Sales	9,240
Cost of sales, excluding depletion	1,656
Depletion	4,033
Net earnings	3,551
Cash Flow From Operations	7,584
Total Assets	259,693
Cobalt Interests [member] | Voisey's Bay [member]
Disclosure of operating segments [line items]
Total Assets	$ 393,422

Segmented Information - Sched_2

Segmented Information - Schedule of Operating Segments (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Salobo and Sudbury [member] | Vale [member]
Disclosure of operating segments [line items]
Percentage of entity's revenue relative to Mine Operator	45.00%	42.00%
Antamina and Yauliyacu [member] | Glencore plc [member]
Disclosure of operating segments [line items]
Percentage of entity's revenue relative to Mine Operator	15.00%	16.00%
Penasquito [member] | Goldcorp Corp [member]
Disclosure of operating segments [line items]
Percentage of entity's revenue relative to Mine Operator	10.00%	10.00%
Constancia and 777 [member] | Hudbay Minerals Inc. [member]
Disclosure of operating segments [line items]
Percentage of entity's revenue relative to Mine Operator	10.00%	10.00%
Gold interests [member]
Disclosure of operating segments [line items]
Percentage of sales	10.00%	10.00%
Silver interests [member]
Disclosure of operating segments [line items]
Percentage of sales	10.00%	10.00%
Silver interests [member] | Veladero and Lagunas Norte and Pierina [member]
Disclosure of operating segments [line items]
Agreement Expiration Date	March 31, 2018	March 31, 2018

Segmented Information - Sched_3

Segmented Information - Schedule of Company's Geographical Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of geographical areas [line items]
Sales	$ 794,012	$ 843,215
Percentage of revenue derived from mineral stream interests located in geographic area	100.00%	100.00%
Mineral stream interest	$ 6,156,839	$ 5,423,277
Percentage of mineral stream interests located in geographic area	100.00%	100.00%
Canada [member]
Disclosure of geographical areas [line items]
Sales	$ 64,589	$ 106,733
Percentage of revenue derived from mineral stream interests located in geographic area	8.00%	13.00%
Mineral stream interest	$ 815,146	$ 448,605
Percentage of mineral stream interests located in geographic area	13.00%	8.00%
United States [member]
Disclosure of geographical areas [line items]
Sales	$ 16,018
Percentage of revenue derived from mineral stream interests located in geographic area	2.00%	0.00%
Mineral stream interest	$ 496,676	$ 433
Percentage of mineral stream interests located in geographic area	8.00%	0.00%
Mexico [member]
Disclosure of geographical areas [line items]
Sales	$ 147,274	$ 162,390
Percentage of revenue derived from mineral stream interests located in geographic area	19.00%	19.00%
Mineral stream interest	$ 598,273	$ 539,620
Percentage of mineral stream interests located in geographic area	10.00%	10.00%
Greece [member]
Disclosure of geographical areas [line items]
Sales	$ 8,020	$ 8,756
Percentage of revenue derived from mineral stream interests located in geographic area	1.00%	1.00%
Mineral stream interest	$ 5,884	$ 9,036
Percentage of mineral stream interests located in geographic area	0.00%	0.00%
Portugal [member]
Disclosure of geographical areas [line items]
Sales	$ 20,484	$ 8,616
Percentage of revenue derived from mineral stream interests located in geographic area	2.00%	1.00%
Mineral stream interest	$ 22,420	$ 23,725
Percentage of mineral stream interests located in geographic area	0.00%	0.00%
Sweden [member]
Disclosure of geographical areas [line items]
Sales	$ 24,188	$ 27,569
Percentage of revenue derived from mineral stream interests located in geographic area	3.00%	3.00%
Mineral stream interest	$ 37,371	$ 39,614
Percentage of mineral stream interests located in geographic area	1.00%	1.00%
Argentina / Chile [member]
Disclosure of geographical areas [line items]
Sales	$ 4,444	$ 12,041
Percentage of revenue derived from mineral stream interests located in geographic area	1.00%	1.00%
Mineral stream interest	$ 264,401	$ 266,989
Percentage of mineral stream interests located in geographic area	4.00%	5.00%
Brazil [member]
Disclosure of geographical areas [line items]
Sales	$ 336,474	$ 317,597
Percentage of revenue derived from mineral stream interests located in geographic area	42.00%	38.00%
Mineral stream interest	$ 2,706,061	$ 2,808,731
Percentage of mineral stream interests located in geographic area	44.00%	52.00%
Peru [member]
Disclosure of geographical areas [line items]
Sales	$ 172,521	$ 199,513
Percentage of revenue derived from mineral stream interests located in geographic area	22.00%	24.00%
Mineral stream interest	$ 1,210,607	$ 1,286,524
Percentage of mineral stream interests located in geographic area	20.00%	24.00%
Gold interests [member]
Disclosure of geographical areas [line items]
Sales	$ 441,193	$ 423,941
Mineral stream interest	3,656,056	3,342,589
Gold interests [member] | Canada [member]
Disclosure of geographical areas [line items]
Mineral stream interest	387,823	411,807
Gold interests [member] | United States [member]
Disclosure of geographical areas [line items]
Mineral stream interest	236,432
Gold interests [member] | Mexico [member]
Disclosure of geographical areas [line items]
Mineral stream interest	208,194
Gold interests [member] | Brazil [member]
Disclosure of geographical areas [line items]
Mineral stream interest	2,706,061	2,808,731
Gold interests [member] | Peru [member]
Disclosure of geographical areas [line items]
Mineral stream interest	117,546	122,051
Silver interests [member]
Disclosure of geographical areas [line items]
Sales	343,579	419,274
Mineral stream interest	1,847,668	2,080,688
Silver interests [member] | Canada [member]
Disclosure of geographical areas [line items]
Mineral stream interest	33,901	36,798
Silver interests [member] | United States [member]
Disclosure of geographical areas [line items]
Mineral stream interest	551	433
Silver interests [member] | Mexico [member]
Disclosure of geographical areas [line items]
Mineral stream interest	390,079	539,620
Silver interests [member] | Greece [member]
Disclosure of geographical areas [line items]
Mineral stream interest	5,884	9,036
Silver interests [member] | Portugal [member]
Disclosure of geographical areas [line items]
Mineral stream interest	22,420	23,725
Silver interests [member] | Sweden [member]
Disclosure of geographical areas [line items]
Mineral stream interest	37,371	39,614
Silver interests [member] | Argentina / Chile [member]
Disclosure of geographical areas [line items]
Mineral stream interest	264,401	266,989
Silver interests [member] | Peru [member]
Disclosure of geographical areas [line items]
Mineral stream interest	1,093,061	$ 1,164,473
Palladium interest [member]
Disclosure of geographical areas [line items]
Mineral stream interest	259,693
Palladium interest [member] | United States [member]
Disclosure of geographical areas [line items]
Mineral stream interest	259,693
Cobalt Interests [member]
Disclosure of geographical areas [line items]
Mineral stream interest	393,422
Cobalt Interests [member] | Canada [member]
Disclosure of geographical areas [line items]
Mineral stream interest	$ 393,422

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	Mar. 20, 2019	Dec. 31, 2018
Disclosure of Events After Reporting Period [line items]
Declaration of quarterly dividend rate description		Under the Company's dividend policy, the quarterly dividend per common share is targeted to equal approximately 30% of the average cash flow generated by operating activities in the previous four quarters divided by the Company's then outstanding common shares, all rounded to the nearest cent.
Dividend reinvested discount rate		3.00%
Major Ordinary Share Transactions [member]
Disclosure of Events After Reporting Period [line items]
Dividend per share	$ 0.09
Dividend payable, date of record	Apr. 5, 2019
Dividend reinvested discount rate	3.00%
Dividend payable date	Apr. 18, 2019
Quarterly dividend [member]
Disclosure of Events After Reporting Period [line items]
Dividend per share		$ 0.09