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Cost of Sales (Schedule of Cost of Sales) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Direct mining costs $ 101,734 $ 99,648
Salaries and benefits 15,040 13,192
Workers' Participation 6,011 6,164
Depletion and depreciation 44,358 44,473
Royalties 4,135 3,248
Impairment of inventories 1,328  
Cost of sales 172,606 166,725
Depletion and depreciation, right-of-use 2,262 0
Caylloma M&I Property [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Direct mining costs 35,712 38,788
Salaries and benefits 7,557 7,303
Workers' Participation 717 1,726
Depletion and depreciation 13,621 12,222
Royalties 750 218
Impairment of inventories 93  
Cost of sales 58,450 60,257
San Jose M&I Property [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Direct mining costs 66,022 60,860
Salaries and benefits 7,483 5,889
Workers' Participation 5,294 4,438
Depletion and depreciation 30,737 32,251
Royalties 3,385 3,030
Impairment of inventories 1,235  
Cost of sales $ 114,156 $ 106,468