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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

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