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Closure and Reclamation Provisions (Schedule of Closure and Rehabilitation Provisions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Current portion $ 3,257 $ 841
Non-current provisions 27,868 15,102
Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 15,943 14,233
Changes in estimate 14,670 1,538
Incurred and charged against the provision (351) (682)
Accretion 726 852
Effect of foreign exchange changes 137 2
Balance at ending 31,125 15,943
Current portion 3,257 841
Non-current provisions 27,868 15,102
Caylloma M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 10,800 9,624
Changes in estimate 394 1,266
Incurred and charged against the provision (201) (559)
Accretion 331 469
Balance at ending 11,324 10,800
Current portion 3,048 682
Non-current provisions 8,276 10,118
San Jose M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 3,716 4,100
Changes in estimate 886 (624)
Incurred and charged against the provision (150) (123)
Accretion 259 361
Effect of foreign exchange changes 137 2
Balance at ending 4,848 3,716
Current portion 209 159
Non-current provisions 4,639 3,557
Lindero Project [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance at beginning 1,427 509
Changes in estimate 13,390 896
Accretion 136 22
Balance at ending 14,953 1,427
Non-current provisions $ 14,953 $ 1,427