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Segmented Information - Additional Information (Details) - Customer Concentration Risk [member] - customer
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
100% of Concentrate and Silver and Gold Sales Revenue [member]    
Disclosure of operating segments [line items]    
Number of significant customers 23  
Sales Revenue [member]    
Disclosure of operating segments [line items]    
Number of significant customers 7 7
Customer A [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 15.00% 28.00%
Customer B [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 15.00% 14.00%
Customer C [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 13.00% 13.00%
Customer D [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 13.00% 10.00%
Customer E [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 9.00% 8.00%
Customer F [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 8.00% 8.00%
Customer G [member] | Sales Revenue [member]    
Disclosure of operating segments [line items]    
Concentration risk (percent) 8.00% 5.00%