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Commitments and Contractual Obligations - Additional Information (Details)
 1 Months Ended 3 Months Ended
Dec. 31, 2018
T
Jul. 01, 2018
$ / oz
Apr. 30, 2007
USD ($)
$ / oz
Jun. 30, 2018
$ / oz
m
Disclosure of contingent liabilities [line items]        
Consideration paid | $     $ 57,500,000.0  
Silver price ($/oz) | $ / oz   6.77 3.90 2.50
Expansion drilling (in meters) | m       10,000
Zinc [member]        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes 52,500      
Lead/Silver Concentrates [member]        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes 5,250      
Gold Concentrate [member]        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes 241,000      
Subsidiaries [member] | Gold Concentrate [member]        
Disclosure of contingent liabilities [line items]        
Number of dry metric tonnes 45,000