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Contingencies (Details)
12 Months Ended
Jul. 11, 2016
Dec. 31, 2019
USD ($)
$ / pure
shares
tonne
Dec. 31, 2019
ARS ($)
shares
tonne
Dec. 31, 2018
USD ($)
Disclosure of contingent liabilities [line items]        
Provision for decommissioning, restoration and rehabilitation costs   $ 188,500,000   $ 70,600,000
Number of shares issuable upon conversion of convertible debenture (shares) | shares   363,854 363,854  
Royalty expense   $ 26,721,000   20,673,000
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   $ 800,000   700,000
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   $ 7,000,000   $ 6,800,000
Maverix Metals Inc. [member]        
Disclosure of contingent liabilities [line items]        
Proportion of ownership interest in associate 54.00% 26.00% 26.00% 34.00%
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    
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    
Agreements to Sell Future Silver Production, Price per Ounce   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   $ 3,500,000   $ 1,600,000
AverageSpecial Export Duty, Percent   6.00% 6.00% 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   $ 5,500,000   $ 4,400,000
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   $ 5,100,000   $ 4,800,000
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%)