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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, 2017 | Dec. 31, 2016
Cost |  |
Balance, January 1 | $ 130,863 |
Balance, December 31 | 133,664 | $ 130,863
Accumulated Impairment |  |
Balance, January 1 | 130,863 |
Impairment reversal (note 14) | 31,119 |
Balance, December 31 | 133,664 | 130,863
Accumulated Depreciation |  |
Balance, January 1 | 130,863 |
Impairment reversal (note 14) | 31,119 |
Balance, December 31 | 133,664 | 130,863
NET BOOK VALUE, December 31, | 130,863 | 130,863
Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 215,446 | 183,528
Acquisition of subsidiary |  | 6,954
Additions | 15,212 | 26,296
Disposals | (9,006) | (456)
Reclassifications | (3) | (876)
Balance, December 31 | 221,649 | 215,446
Accumulated Impairment |  |
Balance, January 1 | 215,446 | 183,528
Balance, December 31 | 221,649 | 215,446
Accumulated Depreciation |  |
Balance, January 1 | 215,446 | 183,528
Balance, December 31 | 221,649 | 215,446
NET BOOK VALUE, December 31, | 215,446 | 183,528
Accumulated impairment [member] |  |
Cost |  |
Balance, January 1 | 22,770 | 22,826
Disposals | (76) | (56)
Balance, December 31 |  | 22,770
Accumulated Impairment |  |
Balance, January 1 | 22,770 | 22,826
Impairment reversal (note 14) | (22,694) |
Balance, December 31 |  | 22,770
Accumulated Depreciation |  |
Balance, January 1 | 22,770 | 22,826
Impairment reversal (note 14) | (22,694) |
Balance, December 31 |  | 22,770
NET BOOK VALUE, December 31, | 22,770 | 22,826
Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance, January 1 | 61,813 | 47,019
Disposals | (5,045) | (390)
Balance, December 31 | 87,985 | 61,813
Accumulated Impairment |  |
Balance, January 1 | 61,813 | 47,019
Impairment reversal (note 14) | 10,437 |
Balance, December 31 | 87,985 | 61,813
Accumulated Depreciation |  |
Balance, January 1 | 61,813 | 47,019
Impairment reversal (note 14) | 10,437 |
Balance, December 31 | 87,985 | 61,813
NET BOOK VALUE, December 31, | 61,813 | 47,019
Mineral Properties and Exploration and Evaluation Assets [member] |  |
Cost |  |
Balance, January 1 | 263,535 |
Balance, December 31 | 296,612 | 263,535
Accumulated Impairment |  |
Balance, January 1 | 263,535 |
Balance, December 31 | 296,612 | 263,535
Accumulated Depreciation |  |
Balance, January 1 | 263,535 |
Balance, December 31 | 296,612 | 263,535
NET BOOK VALUE, December 31, | 263,535 | 263,535
Mineral Properties and Exploration and Evaluation Assets [member] | Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 384,323 | 231,172
Acquisition of subsidiary |  | 128,687
Additions | 36,229 | 24,440
Change in rehabilitation provision | 818 | 291
Disposals | (202) | (1,143)
Reclassifications | 3 | 876
Balance, December 31 | 421,171 | 384,323
Accumulated Impairment |  |
Balance, January 1 | 384,323 | 231,172
Balance, December 31 | 421,171 | 384,323
Accumulated Depreciation |  |
Balance, January 1 | 384,323 | 231,172
Balance, December 31 | 421,171 | 384,323
NET BOOK VALUE, December 31, | 384,323 | 231,172
Mineral Properties and Exploration and Evaluation Assets [member] | Accumulated impairment [member] |  |
Cost |  |
Balance, January 1 | 31,900 | 31,900
Balance, December 31 |  | 31,900
Accumulated Impairment |  |
Balance, January 1 | 31,900 | 31,900
Impairment reversal (note 14) | (31,900) |
Balance, December 31 |  | 31,900
Accumulated Depreciation |  |
Balance, January 1 | 31,900 | 31,900
Impairment reversal (note 14) | (31,900) |
Balance, December 31 |  | 31,900
NET BOOK VALUE, December 31, | 31,900 | 31,900
Mineral Properties and Exploration and Evaluation Assets [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance, January 1 | 88,888 | 70,552
Balance, December 31 | 124,559 | 88,888
Accumulated Impairment |  |
Balance, January 1 | 88,888 | 70,552
Impairment reversal (note 14) | 13,038 |
Balance, December 31 | 124,559 | 88,888
Accumulated Depreciation |  |
Balance, January 1 | 88,888 | 70,552
Impairment reversal (note 14) | 13,038 |
Depletion | 22,633 | 18,336
Balance, December 31 | 124,559 | 88,888
NET BOOK VALUE, December 31, | 88,888 | 70,552
Caylloma Plant and Mine Equipment [member] | Depletable [member] |  |
Cost |  |
Balance, January 1 | 26,671 |
Balance, December 31 | 51,616 | 26,671
Accumulated Impairment |  |
Balance, January 1 | 26,671 |
Balance, December 31 | 51,616 | 26,671
Accumulated Depreciation |  |
Balance, January 1 | 26,671 |
Balance, December 31 | 51,616 | 26,671
NET BOOK VALUE, December 31, | 26,671 | 26,671
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 100,630 | 92,973
Additions | 10,599 | 7,060
Change in rehabilitation provision | 1,448 | 597
Reclassifications | (8) |
Balance, December 31 | 112,669 | 100,630
Accumulated Impairment |  |
Balance, January 1 | 100,630 | 92,973
Balance, December 31 | 112,669 | 100,630
Accumulated Depreciation |  |
Balance, January 1 | 100,630 | 92,973
Balance, December 31 | 112,669 | 100,630
NET BOOK VALUE, December 31, | 100,630 | 92,973
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Accumulated impairment [member] |  |
Cost |  |
Balance, January 1 | 31,900 | 31,900
Balance, December 31 |  | 31,900
Accumulated Impairment |  |
Balance, January 1 | 31,900 | 31,900
Impairment reversal (note 14) | (31,900) |
Balance, December 31 |  | 31,900
Accumulated Depreciation |  |
Balance, January 1 | 31,900 | 31,900
Impairment reversal (note 14) | (31,900) |
Balance, December 31 |  | 31,900
NET BOOK VALUE, December 31, | 31,900 | 31,900
Caylloma Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance, January 1 | 42,059 | 37,552
Balance, December 31 | 61,053 | 42,059
Accumulated Impairment |  |
Balance, January 1 | 42,059 | 37,552
Impairment reversal (note 14) | 13,038 |
Balance, December 31 | 61,053 | 42,059
Accumulated Depreciation |  |
Balance, January 1 | 42,059 | 37,552
Impairment reversal (note 14) | 13,038 |
Depletion | 5,956 | 4,507
Balance, December 31 | 61,053 | 42,059
NET BOOK VALUE, December 31, | 42,059 | 37,552
San Jose Property Plant and Mine Equipment [member] | Depletable [member] |  |
Cost |  |
Balance, January 1 | 104,430 |
Balance, December 31 | 100,692 | 104,430
Accumulated Impairment |  |
Balance, January 1 | 104,430 |
Balance, December 31 | 100,692 | 104,430
Accumulated Depreciation |  |
Balance, January 1 | 104,430 |
Balance, December 31 | 100,692 | 104,430
NET BOOK VALUE, December 31, | 104,430 | 104,430
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 151,259 | 136,666
Additions | 13,888 | 14,643
Change in rehabilitation provision | (931) | (414)
Disposals |  | (512)
Reclassifications | (18) | 876
Balance, December 31 | 164,198 | 151,259
Accumulated Impairment |  |
Balance, January 1 | 151,259 | 136,666
Balance, December 31 | 164,198 | 151,259
Accumulated Depreciation |  |
Balance, January 1 | 151,259 | 136,666
Balance, December 31 | 164,198 | 151,259
NET BOOK VALUE, December 31, | 151,259 | 136,666
San Jose Property Plant and Mine Equipment [member] | Depletable [member] | Accumulated depreciation and amortisation [member] |  |
Cost |  |
Balance, January 1 | 46,829 | 33,000
Balance, December 31 | 63,506 | 46,829
Accumulated Impairment |  |
Balance, January 1 | 46,829 | 33,000
Balance, December 31 | 63,506 | 46,829
Accumulated Depreciation |  |
Balance, January 1 | 46,829 | 33,000
Depletion | 16,677 | 13,829
Balance, December 31 | 63,506 | 46,829
NET BOOK VALUE, December 31, | 46,829 | 33,000
Lindero Project [member] | Non Depletable [member] |  |
Cost |  |
Balance, January 1 | 130,590 |
Balance, December 31 | 140,154 | 130,590
Accumulated Impairment |  |
Balance, January 1 | 130,590 |
Balance, December 31 | 140,154 | 130,590
Accumulated Depreciation |  |
Balance, January 1 | 130,590 |
Balance, December 31 | 140,154 | 130,590
NET BOOK VALUE, December 31, | 130,590 | 130,590
Lindero Project [member] | Non Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 130,590 |
Acquisition of subsidiary |  | 128,687
Additions | 9,234 | 1,795
Change in rehabilitation provision | 301 | 108
Reclassifications | 29 |
Balance, December 31 | 140,154 | 130,590
Accumulated Impairment |  |
Balance, January 1 | 130,590 |
Balance, December 31 | 140,154 | 130,590
Accumulated Depreciation |  |
Balance, January 1 | 130,590 |
Balance, December 31 | 140,154 | 130,590
NET BOOK VALUE, December 31, | 130,590 | 130,590
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member] |  |
Cost |  |
Balance, January 1 | 1,844 |
Balance, December 31 | 4,150 | 1,844
Accumulated Impairment |  |
Balance, January 1 | 1,844 |
Balance, December 31 | 4,150 | 1,844
Accumulated Depreciation |  |
Balance, January 1 | 1,844 |
Balance, December 31 | 4,150 | 1,844
NET BOOK VALUE, December 31, | 1,844 | 1,844
Other Mineral Properties and Exploration and Evaluation Assets [member] | Non Depletable [member] | Gross carrying amount [member] |  |
Cost |  |
Balance, January 1 | 1,844 | 1,533
Additions | 2,508 | 942
Disposals | (202) | (631)
Balance, December 31 | 4,150 | 1,844
Accumulated Impairment |  |
Balance, January 1 | 1,844 | 1,533
Balance, December 31 | 4,150 | 1,844
Accumulated Depreciation |  |
Balance, January 1 | 1,844 | 1,533
Balance, December 31 | 4,150 | 1,844
NET BOOK VALUE, December 31, | $ 1,844 | $ 1,533

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