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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, 2018 | Dec. 31, 2017
Cost |  |
Balance at December 31 | $ 133,664 |
Disposals | (107) |
Reclassifications | 194 | $ 1,701
Balance at December 31 | 192,200 | 133,664
Accumulated Impairment |  |
Balance at December 31 | 133,664 |
Balance at December 31 | 192,200 | 133,664
Accumulated Depreciation |  |
Balance at December 31 | 133,664 |
Balance at December 31 | 192,200 | 133,664
NET BOOK VALUE at December 31, | 133,664 | 133,664
Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 221,649 | 215,446
Additions | 79,131 | 14,900
Changes in rehabilitation provision | 550 | 312
Disposals | (2,243) | (9,006)
Reclassifications |  | (3)
Balance at December 31 | 299,087 | 221,649
Accumulated Impairment |  |
Balance at December 31 | 221,649 | 215,446
Balance at December 31 | 299,087 | 221,649
Accumulated Depreciation |  |
Balance at December 31 | 221,649 | 215,446
Balance at December 31 | 299,087 | 221,649
NET BOOK VALUE at December 31, | 221,649 | 215,446
Accumulated impairment [member] |  |
Cost |  |
Balance at December 31 |  | 22,770
Disposals |  | (76)
Accumulated Impairment |  |
Balance at December 31 |  | 22,770
Impairment reversal (note 14) |  | (22,694)
Accumulated Depreciation |  |
Balance at December 31 |  | 22,770
Impairment reversal (note 14) |  | (22,694)
NET BOOK VALUE at December 31, |  | 22,770
Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance at December 31 | 87,985 | 61,813
Disposals | (2,040) | (5,045)
Balance at December 31 | 106,887 | 87,985
Accumulated Impairment |  |
Balance at December 31 | 87,985 | 61,813
Impairment reversal (note 14) |  | 10,437
Balance at December 31 | 106,887 | 87,985
Accumulated Depreciation |  |
Balance at December 31 | 87,985 | 61,813
Impairment reversal (note 14) |  | 10,437
Balance at December 31 | 106,887 | 87,985
NET BOOK VALUE at December 31, | 87,985 | 61,813
Mineral Properties and Exploration and Evaluation Assets [member] |  |
Cost |  |
Balance at December 31 | 296,612 |
Balance at December 31 | 312,800 | 296,612
Accumulated Impairment |  |
Balance at December 31 | 296,612 |
Balance at December 31 | 312,800 | 296,612
Accumulated Depreciation |  |
Balance at December 31 | 296,612 |
Balance at December 31 | 312,800 | 296,612
NET BOOK VALUE at December 31, | 296,612 | 296,612
Mineral Properties and Exploration and Evaluation Assets [member] | Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 421,171 | 384,323
Additions | 38,704 | 36,229
Changes in rehabilitation provision | 1,010 | 818
Disposals |  | (202)
Reclassifications |  | 3
Balance at December 31 | 460,885 | 421,171
Accumulated Impairment |  |
Balance at December 31 | 421,171 | 384,323
Balance at December 31 | 460,885 | 421,171
Accumulated Depreciation |  |
Balance at December 31 | 421,171 | 384,323
Balance at December 31 | 460,885 | 421,171
NET BOOK VALUE at December 31, | 421,171 | 384,323
Mineral Properties and Exploration and Evaluation Assets [member] | Accumulated impairment [member] |  |
Cost |  |
Balance at December 31 |  | 31,900
Accumulated Impairment |  |
Balance at December 31 |  | 31,900
Impairment reversal (note 14) |  | (31,900)
Accumulated Depreciation |  |
Balance at December 31 |  | 31,900
Impairment reversal (note 14) |  | (31,900)
NET BOOK VALUE at December 31, |  | 31,900
Mineral Properties and Exploration and Evaluation Assets [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance at December 31 | 124,559 | 88,888
Balance at December 31 | 148,085 | 124,559
Accumulated Impairment |  |
Balance at December 31 | 124,559 | 88,888
Impairment reversal (note 14) |  | 13,038
Balance at December 31 | 148,085 | 124,559
Accumulated Depreciation |  |
Balance at December 31 | 124,559 | 88,888
Impairment reversal (note 14) |  | 13,038
Depletion | 23,526 | 22,633
Balance at December 31 | 148,085 | 124,559
NET BOOK VALUE at December 31, | 124,559 | 88,888
Caylloma Plant and Mine Equipment [member] | Depletable [member] |  |
Cost |  |
Balance at December 31 | 51,616 |
Balance at December 31 | 53,418 | 51,616
Accumulated Impairment |  |
Balance at December 31 | 51,616 |
Balance at December 31 | 53,418 | 51,616
Accumulated Depreciation |  |
Balance at December 31 | 51,616 |
Balance at December 31 | 53,418 | 51,616
NET BOOK VALUE at December 31, | 51,616 | 51,616
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 112,669 | 100,630
Additions | 8,240 | 10,599
Changes in rehabilitation provision | 716 | 1,448
Reclassifications |  | (8)
Balance at December 31 | 121,625 | 112,669
Accumulated Impairment |  |
Balance at December 31 | 112,669 | 100,630
Balance at December 31 | 121,625 | 112,669
Accumulated Depreciation |  |
Balance at December 31 | 112,669 | 100,630
Balance at December 31 | 121,625 | 112,669
NET BOOK VALUE at December 31, | 112,669 | 100,630
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Accumulated impairment [member] |  |
Cost |  |
Balance at December 31 |  | 31,900
Accumulated Impairment |  |
Balance at December 31 |  | 31,900
Impairment reversal (note 14) |  | (31,900)
Accumulated Depreciation |  |
Balance at December 31 |  | 31,900
Impairment reversal (note 14) |  | (31,900)
NET BOOK VALUE at December 31, |  | 31,900
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance at December 31 | 61,053 | 42,059
Balance at December 31 | 68,207 | 61,053
Accumulated Impairment |  |
Balance at December 31 | 61,053 | 42,059
Impairment reversal (note 14) |  | 13,038
Balance at December 31 | 68,207 | 61,053
Accumulated Depreciation |  |
Balance at December 31 | 61,053 | 42,059
Impairment reversal (note 14) |  | 13,038
Depletion | 7,154 | 5,956
Balance at December 31 | 68,207 | 61,053
NET BOOK VALUE at December 31, | 61,053 | 42,059
San Jose Property Plant and Mine Equipment [member] | Gross carrying amount [member] |  |
Cost |  |
Additions | 1,796 |
San Jose Property Plant and Mine Equipment [member] | Depletable [member] |  |
Cost |  |
Balance at December 31 | 100,692 |
Balance at December 31 | 95,731 | 100,692
Accumulated Impairment |  |
Balance at December 31 | 100,692 |
Balance at December 31 | 95,731 | 100,692
Accumulated Depreciation |  |
Balance at December 31 | 100,692 |
Balance at December 31 | 95,731 | 100,692
NET BOOK VALUE at December 31, | 100,692 | 100,692
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 164,198 | 151,259
Additions | 12,035 | 13,888
Changes in rehabilitation provision | (624) | (931)
Reclassifications |  | (18)
Balance at December 31 | 175,609 | 164,198
Accumulated Impairment |  |
Balance at December 31 | 164,198 | 151,259
Balance at December 31 | 175,609 | 164,198
Accumulated Depreciation |  |
Balance at December 31 | 164,198 | 151,259
Balance at December 31 | 175,609 | 164,198
NET BOOK VALUE at December 31, | 164,198 | 151,259
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance at December 31 | 63,506 | 46,829
Balance at December 31 | 79,878 | 63,506
Accumulated Impairment |  |
Balance at December 31 | 63,506 | 46,829
Balance at December 31 | 79,878 | 63,506
Accumulated Depreciation |  |
Balance at December 31 | 63,506 | 46,829
Depletion | 16,372 | 16,677
Balance at December 31 | 79,878 | 63,506
NET BOOK VALUE at December 31, | 63,506 | 46,829
Lindero Project [member] | Gross carrying amount [member] |  |
Cost |  |
Additions | 59,356 |
Lindero Project [member] | Non Depletable [member] |  |
Cost |  |
Balance at December 31 | 140,154 |
Balance at December 31 | 155,854 | 140,154
Accumulated Impairment |  |
Balance at December 31 | 140,154 |
Balance at December 31 | 155,854 | 140,154
Accumulated Depreciation |  |
Balance at December 31 | 140,154 |
Balance at December 31 | 155,854 | 140,154
NET BOOK VALUE at December 31, | 140,154 | 140,154
Lindero Project [member] | Non Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 140,154 | 130,590
Additions | 14,782 | 9,234
Changes in rehabilitation provision | 918 | 301
Reclassifications |  | 29
Balance at December 31 | 155,854 | 140,154
Accumulated Impairment |  |
Balance at December 31 | 140,154 | 130,590
Balance at December 31 | 155,854 | 140,154
Accumulated Depreciation |  |
Balance at December 31 | 140,154 | 130,590
Balance at December 31 | 155,854 | 140,154
NET BOOK VALUE at December 31, | 140,154 | 130,590
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member] |  |
Cost |  |
Balance at December 31 | 4,150 |
Balance at December 31 | 7,797 | 4,150
Accumulated Impairment |  |
Balance at December 31 | 4,150 |
Balance at December 31 | 7,797 | 4,150
Accumulated Depreciation |  |
Balance at December 31 | 4,150 |
Balance at December 31 | 7,797 | 4,150
NET BOOK VALUE at December 31, | 4,150 | 4,150
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance at December 31 | 4,150 | 1,844
Additions | 3,647 | 2,508
Disposals |  | (202)
Balance at December 31 | 7,797 | 4,150
Accumulated Impairment |  |
Balance at December 31 | 4,150 | 1,844
Balance at December 31 | 7,797 | 4,150
Accumulated Depreciation |  |
Balance at December 31 | 4,150 | 1,844
Balance at December 31 | 7,797 | 4,150
NET BOOK VALUE at December 31, | $ 4,150 | $ 1,844

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