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Property, plant and equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | $ 80,548 |
Impairments | 204 |
Balance | 100,301 | 80,548
Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 185,055 | 178,057
Asset additions | 19,557 | 7,972
Property purchase option acquired | 7,108 |
Change in decommissioning provision | 1 | (891)
Disposals |  | (83)
Reclassification |  |
Balance | 211,721 | 185,055
Accumulated depreciation and depletion [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 104,507 | 97,182
Depreciation/depletion for the year | 6,709 | 7,388
Impairments | 204 |
Disposals |  | (63)
Balance | 111,420 | 104,507
Carrying value [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 80,548 |
Balance | 100,301 | 80,548
Mining interests [Member] | Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 67,571 | 63,954
Asset additions | 5,233 | 4,569
Property purchase option acquired |  |
Change in decommissioning provision | (37) | (952)
Disposals |  |
Reclassification | 31,595 |
Balance | 104,362 | 67,571
Mining interests [Member] | Accumulated depreciation and depletion [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 31,410 | 28,298
Depreciation/depletion for the year | 3,438 | 3,112
Impairments |  |
Disposals |  |
Balance | 34,848 | 31,410
Mining interests [Member] | Carrying value [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 36,161 |
Balance | 69,514 | 36,161
Non-producing properties [Member] | Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 77,390 | 75,746
Asset additions | 5,526 | 1,583
Property purchase option acquired | 7,108 |
Change in decommissioning provision | 38 | 61
Disposals |  |
Reclassification | (31,595) |
Balance | 58,467 | 77,390
Non-producing properties [Member] | Accumulated depreciation and depletion [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 50,502 | 50,502
Depreciation/depletion for the year |  |
Impairments |  |
Disposals |  |
Balance | 50,502 | 50,502
Non-producing properties [Member] | Carrying value [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 26,888 |
Balance | 7,965 | 26,888
Plant and equipment [Member] | Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 40,013 | 38,196
Asset additions | 8,795 | 1,817
Property purchase option acquired |  |
Change in decommissioning provision |  |
Disposals |  |
Reclassification |  |
Balance | 48,808 | 40,013
Plant and equipment [Member] | Accumulated depreciation and depletion [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 22,566 | 18,305
Depreciation/depletion for the year | 3,261 | 4,261
Impairments | 204 |
Disposals |  |
Balance | 26,031 | 22,566
Plant and equipment [Member] | Carrying value [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 17,447 |
Balance | 22,777 | 17,447
Corporate Office equipment [Member] | Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 81 | 161
Asset additions | 3 | 3
Property purchase option acquired |  |
Change in decommissioning provision |  |
Disposals |  | (83)
Reclassification |  |
Balance | 84 | 81
Corporate Office equipment [Member] | Accumulated depreciation and depletion [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 29 | 77
Depreciation/depletion for the year | 10 | 15
Impairments |  |
Disposals |  | (63)
Balance | 39 | 29
Corporate Office equipment [Member] | Carrying value [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance | 52 |
Balance | $ 45 | $ 52

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