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Commitments and Contractual Obligations (Details)
m in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 01, 2019
$ / oz
Apr. 30, 2007
USD ($)
$ / oz
Jun. 30, 2019
$ / oz
m
Dec. 31, 2019
T
Disclosure of contingent liabilities [line items]        
Consideration paid | $   $ 57.5    
Silver price ($/oz) | $ / oz 9.27 3.90 2.50  
Expansion drilling (in meters) | m     20  
Tuprag Metal Madencilik Sanayi Ve Ticaret AS | Gold Concentrate        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes       61,000
Hellas | Zinc        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes       17,000
Hellas | Lead And Silver Concentrates        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes       2,750
Hellas | Gold Concentrate        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes       96,000