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Commitments (Narrative) (Details) - 12 months ended Dec. 31, 2021
$ in Millions, $ in Millions
USD ($)
Ounce
CAD ($)
Ounce
Disclosure Of Commitments [Line Items]    
Amount payable for mining equipment and service contracts | $   $ 40.9
Amount payable for mining equipment and service contracts in 2022 | $   33.3
Amount payable for mining equipment and service contracts in 2023 | $   $ 7.6
Amulsar stream [Member]    
Disclosure Of Commitments [Line Items]    
Delivery of gold, ounces 89,034  
Delivery of silver, ounces 434,093  
Credit bid transaction percentage 35.60%  
Amulsar stream [Member] | 1st Anniversary [Member]    
Disclosure Of Commitments [Line Items]    
Buy-back option, percentage 50.00%  
Buy-back option | $ $ 34.4  
Amulsar stream [Member] | 2nd and 3rd anniversary [Member]    
Disclosure Of Commitments [Line Items]    
Buy-back option, percentage 50.00%  
Buy-back option | $ $ 31.3  
Amulsar offtake [Member]    
Disclosure Of Commitments [Line Items]    
Potential offtake percentage 84.87%  
Delivery of gold, ounces 2,110,425  
Description of offtake percentage increase Offtake percentage will increase to 84.87% if the operator elects to reduce the gold stream  
Gold per ounces, attributable to OBL (less any ounces delivered pursuant to the Amulsar stream) 1,853,751  
Back Forty stream [Member]    
Disclosure Of Commitments [Line Items]    
Delivery of gold, ounces 105,000  
Back Forty stream [Member] | After reaching 105,000 ounces of gold [Member]    
Disclosure Of Commitments [Line Items]    
Potential stream percentage 9.25%  
Mantos Blancos stream [Member]    
Disclosure Of Commitments [Line Items]    
Delivery of silver, ounces 19,300,000  
Silver ounces delivered as of December 31, 2021   2,700,000
Potential stream percentage 100.00%  
Mantos Blancos stream [Member] | After reaching 19.3 million ounces of silver [Member]    
Disclosure Of Commitments [Line Items]    
Potential stream percentage 40.00%  
Gibraltar mine's production [Member]    
Disclosure Of Commitments [Line Items]    
Delivery of silver, ounces 5,900,000  
Gibraltar stream [Member]    
Disclosure Of Commitments [Line Items]    
Delivery of silver, ounces 900,000  
Potential stream percentage 75.00%  
Gibraltar stream [Member] | After reaching 5.9 million ounces of silver [Member]    
Disclosure Of Commitments [Line Items]    
Potential stream percentage - Gibco's share 35.00%