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Closure and Reclamation Provisions (Schedule of Closure and Rehabilitation Provisions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Current portion $ 380 $ 3,257
Non-current provisions 39,970 27,868
Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 31,125 15,943
Changes in estimate 9,098 14,670
Incurred and charged against the provision (341) (351)
Accretion 754 726
Effect of foreign exchange changes (286) 137
Balance at ending 40,350 31,125
Current portion (380) (3,257)
Non-current provisions 39,970 27,868
Caylloma M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 11,324 10,800
Changes in estimate 3,288 394
Incurred and charged against the provision (114) (201)
Accretion 256 331
Effect of foreign exchange changes 7  
Balance at ending 14,761 11,324
Current portion (142) (3,048)
Non-current provisions 14,619 8,276
Increase (decrease) to other provisions 3,179  
San Jose M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 4,848 3,716
Changes in estimate 1,328 886
Incurred and charged against the provision (227) (150)
Accretion 249 259
Effect of foreign exchange changes (293) 137
Balance at ending 5,905 4,848
Current portion (238) (209)
Non-current provisions 5,667 4,639
Lindero Project [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 14,953 1,427
Changes in estimate 4,482 13,390
Accretion 249 136
Balance at ending 19,684 14,953
Non-current provisions $ 19,684 $ 14,953