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Mineral Properties and Exploration and Evaluation Assets (Schedule Related to Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cost    
Balance at December 31 $ 375,656  
Balance at December 31 405,410 $ 375,656
Accumulated Depreciation    
Balance at December 31 375,656  
Balance at December 31 405,410 375,656
NET BOOK VALUE at December 31, 405,410 375,656
Gross carrying amount [member]    
Cost    
Balance at December 31 509,638 306,403
Additions 59,138 204,189
Changes in closure and reclamation provision 682 171
Disposals (1,744) (1,125)
Balance at December 31 567,714 509,638
Accumulated Depreciation    
Balance at December 31 509,638 306,403
Disposals 1,744 1,125
Balance at December 31 567,714 509,638
NET BOOK VALUE at December 31, 567,714 509,638
Accumulated depreciation and amortisation [member]    
Cost    
Balance at December 31 (133,982) (106,887)
Disposals 1,126 825
Balance at December 31 (162,304) (133,982)
Accumulated Depreciation    
Balance at December 31 (133,982) (106,887)
Disposals (1,126) (825)
Balance at December 31 (162,304) (133,982)
NET BOOK VALUE at December 31, (162,304) (133,982)
Mineral Properties and Exploration and Evaluation Assets [member]    
Cost    
Balance at December 31 353,519  
Balance at December 31 385,717 353,519
Accumulated Depreciation    
Balance at December 31 353,519  
Balance at December 31 385,717 353,519
NET BOOK VALUE at December 31, 385,717 353,519
Mineral Properties and Exploration and Evaluation Assets [member] | Gross carrying amount [member]    
Cost    
Balance at December 31 524,376 460,885
Additions 45,947 51,371
Changes in closure and reclamation provision 8,657 14,636
Write-downs (1,421)  
Disposals   (2,516)
Balance at December 31 577,559 524,376
Accumulated Depreciation    
Balance at December 31 524,376 460,885
Disposals   2,516
Balance at December 31 577,559 524,376
NET BOOK VALUE at December 31, 577,559 524,376
Mineral Properties and Exploration and Evaluation Assets [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance at December 31 (170,857) (148,085)
Disposals 543  
Balance at December 31 (191,842) (170,857)
Accumulated Depreciation    
Balance at December 31 (170,857) (148,085)
Disposals (543)  
Depletion 21,528 22,772
Balance at December 31 (191,842) (170,857)
NET BOOK VALUE at December 31, (191,842) (170,857)
Mineral Properties [member]    
Cost    
Balance at December 31 7,933 7,797
Additions 1,298 2,652
Write-downs (188) (2,516)
Balance at December 31 9,043 7,933
Accumulated Depreciation    
Balance at December 31 7,933 7,797
Balance at December 31 9,043 7,933
NET BOOK VALUE at December 31, 9,043 7,933
Caylloma Plant and Mine Equipment [member] | Depletable [member]    
Cost    
Balance at December 31 53,809  
Balance at December 31 53,297 53,809
Accumulated Depreciation    
Balance at December 31 53,809  
Balance at December 31 53,297 53,809
NET BOOK VALUE at December 31, 53,297 53,809
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member]    
Cost    
Balance at December 31 128,244 121,625
Additions 3,833 6,396
Changes in closure and reclamation provision 2,599 223
Balance at December 31 134,676 128,244
Accumulated Depreciation    
Balance at December 31 128,244 121,625
Balance at December 31 134,676 128,244
NET BOOK VALUE at December 31, 134,676 128,244
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance at December 31 (74,435) (68,207)
Balance at December 31 (81,379) (74,435)
Accumulated Depreciation    
Balance at December 31 (74,435) (68,207)
Depletion 6,944 6,228
Balance at December 31 (81,379) (74,435)
NET BOOK VALUE at December 31, (81,379) (74,435)
San Jose Property Plant and Mine Equipment [member] | Depletable [member]    
Cost    
Balance at December 31 87,911  
Balance at December 31 82,275 87,911
Accumulated Depreciation    
Balance at December 31 87,911  
Balance at December 31 82,275 87,911
NET BOOK VALUE at December 31, 82,275 87,911
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member]    
Cost    
Balance at December 31 184,333 175,609
Additions 8,310 7,838
Changes in closure and reclamation provision 1,328 886
Write-downs (1,233)  
Balance at December 31 192,738 184,333
Accumulated Depreciation    
Balance at December 31 184,333 175,609
Balance at December 31 192,738 184,333
NET BOOK VALUE at December 31, 192,738 184,333
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member]    
Cost    
Balance at December 31 (96,422) (79,878)
Disposals 543  
Balance at December 31 (110,463) (96,422)
Accumulated Depreciation    
Balance at December 31 (96,422) (79,878)
Disposals (543)  
Depletion 14,584 16,544
Balance at December 31 (110,463) (96,422)
NET BOOK VALUE at December 31, (110,463) (96,422)
Lindero Project [member] | Non Depletable [member]    
Cost    
Balance at December 31 203,866  
Balance at December 31 241,102 203,866
Accumulated Depreciation    
Balance at December 31 203,866  
Balance at December 31 241,102 203,866
NET BOOK VALUE at December 31, 241,102 203,866
Lindero Project [member] | Non Depletable [member] | Gross carrying amount [member]    
Cost    
Balance at December 31 203,866 155,854
Additions 32,506 34,485
Changes in closure and reclamation provision 4,730 13,527
Balance at December 31 241,102 203,866
Accumulated Depreciation    
Balance at December 31 203,866 155,854
Balance at December 31 241,102 203,866
NET BOOK VALUE at December 31, 241,102 203,866
Other Mineral Properties and Exploration and Evaluation Assets [member]    
Cost    
Balance at December 31 225 73
Additions 967 152
Write-downs (188)  
Balance at December 31 1,004 225
Accumulated Depreciation    
Balance at December 31 225 73
Balance at December 31 1,004 225
NET BOOK VALUE at December 31, 1,004 225
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member]    
Cost    
Balance at December 31 7,933  
Balance at December 31 9,043 7,933
Accumulated Depreciation    
Balance at December 31 7,933  
Balance at December 31 9,043 7,933
NET BOOK VALUE at December 31, 9,043 7,933
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member] | Gross carrying amount [member]    
Cost    
Balance at December 31 7,933 7,797
Additions 1,298 2,652
Write-downs (188)  
Disposals   (2,516)
Balance at December 31 9,043 7,933
Accumulated Depreciation    
Balance at December 31 7,933 7,797
Disposals   2,516
Balance at December 31 9,043 7,933
NET BOOK VALUE at December 31, 9,043 7,933
Tlacolula E&EA | MEXICO    
Cost    
Balance at December 31 3,516 3,298
Additions 209 218
Balance at December 31 3,725 3,516
Accumulated Depreciation    
Balance at December 31 3,516 3,298
Balance at December 31 3,725 3,516
NET BOOK VALUE at December 31, 3,725 3,516
Pachuca E&EA | MEXICO    
Cost    
Additions   962
Write-downs   (962)
Arizaro E&EA | ARGENTINA    
Cost    
Balance at December 31 936 934
Additions   2
Balance at December 31 936 936
Accumulated Depreciation    
Balance at December 31 936 934
Balance at December 31 936 936
NET BOOK VALUE at December 31, 936 936
Esperanza E&EA | ARGENTINA    
Cost    
Balance at December 31   788
Write-downs   (788)
Accumulated Depreciation    
Balance at December 31   788
NET BOOK VALUE at December 31,   788
Incachule E&EA | ARGENTINA    
Cost    
Balance at December 31   766
Write-downs   (766)
Accumulated Depreciation    
Balance at December 31   766
NET BOOK VALUE at December 31,   766
Barje E&EA [Member] | SERBIA    
Cost    
Balance at December 31 3,256 1,938
Additions 122 1,318
Balance at December 31 3,378 3,256
Accumulated Depreciation    
Balance at December 31 3,256 1,938
Balance at December 31 3,378 3,256
NET BOOK VALUE at December 31, $ 3,378 $ 3,256