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Commitments and Contingencies (Details)
2 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Jul. 11, 2016
Apr. 20, 2017
Feb. 21, 2017
Dec. 31, 2018
USD ($)
$ / pure
Jun. 29, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / pure
shares
tonne
Dec. 31, 2018
ARS ($)
shares
tonne
Dec. 31, 2017
USD ($)
Disclosure of contingent liabilities [line items]                  
Provision for decommissioning, restoration and rehabilitation costs       $ 70,600,000   $ 65,400,000 $ 70,600,000   $ 65,400,000
Number of shares issuable upon conversion of convertible debenture (shares) | shares             363,854 363,854  
Royalty expense             $ 20,673,000   24,510,000
Dolores mine [member]                  
Disclosure of contingent liabilities [line items]                  
Net Smelter Return Royalties, Silver Production, Percent             2.00% 2.00%  
Net Smelter Return Royalties, Gold Production, Percent             3.25% 3.25%  
Barrick Gold Corp. [Member] | Manantial Espejo mine [member]                  
Disclosure of contingent liabilities [line items]                  
Net Smelter Returns Royalty             0.50% 0.50%  
Royalty Expense Per Unit             $ 0.60    
Production Cap for Royalty Charge | tonne             1,000,000 1,000,000  
EMUSA [Member] | San Vicente mine [member]                  
Disclosure of contingent liabilities [line items]                  
Royalty expense             $ 700,000   900,000
Net Smelter Return Royalties, Silver Production, Percent             2.00% 2.00%  
Minimum Average Price per Ounce of Silver to Trigger Royalty             $ 9.00    
Royal Gold Inc. [Member]                  
Disclosure of contingent liabilities [line items]                  
Royalty expense             $ 6,800,000   5,500,000
Maverix Metals Inc. [member]                  
Disclosure of contingent liabilities [line items]                  
Proportion of ownership interest in associate 54.00% 41.00% 43.00% 29.00% 40.00% 40.00% 40.00% 40.00%  
Maverix Metals Inc. [member] | La Colorada mine [member]                  
Disclosure of contingent liabilities [line items]                  
Agreements to sell future gold production, percent of production (percent)             100.00% 100.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)       650     650    
Maverix Metals Inc. [member] | La Bolsa mine [member]                  
Disclosure of contingent liabilities [line items]                  
Agreements to sell future gold production, percent of production (percent)             5.00% 5.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)       450     450    
Agreements to Sell Future Silver Production, Price per Ounce       450     450    
Maverix Metals Inc. [member] | Pico Machay project [Member]                  
Disclosure of contingent liabilities [line items]                  
Net Smelter Returns Royalty             1.00% 1.00%  
ARGENTINA                  
Disclosure of contingent liabilities [line items]                  
Export Duty Amount             $ 1,600,000    
AverageSpecial Export Duty, Percent             8.00% 8.00%  
Export Duty, Percent             12.00% 12.00%  
Provincial Royalty, Operating Income, Percent             3.00% 3.00%  
ARGENTINA | ArgeninianGovernment [Member]                  
Disclosure of contingent liabilities [line items]                  
ARSExportDutyperUSDGoldExport               $ 4  
ARSExportDutyperUSDSilverExport               $ 3  
Province of Santa Cruz [Member] | Manantial Espejo mine [member]                  
Disclosure of contingent liabilities [line items]                  
Royalty, Operating Cash Flow, Percent             3.00% 3.00%  
BOLIVIA | San Vicente mine [member]                  
Disclosure of contingent liabilities [line items]                  
Royalty, Gross Metal Value of Sales, Silver, Percent             6.00% 6.00%  
BOLIVIA | Bolivian Government [Member] | San Vicente mine [member]                  
Disclosure of contingent liabilities [line items]                  
Royalty expense             $ 4,400,000   5,000,000
Royalty, Gross Metal Value of Sales, Zinc and Copper, Percent             5.00% 5.00%  
BOLIVIA | COMIBOL [Member] | San Vicente mine [member]                  
Disclosure of contingent liabilities [line items]                  
Royalty expense             $ 4,800,000   $ 8,500,000
Participation Fee, as Percentage of Operation Cash Flow             37.50% 37.50%  
Increase (Decrease) in Participation Fee, as Percentage of Operation Cash Flows             (75.00%) (75.00%)