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PROPERTY, PLANT AND EQUIPMENT - Additional Information for Rollforward (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 19, 2018 USD ($) | May 31, 2017 USD ($) | Jan. 16, 2017 USD ($) installment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2017 | Feb. 28, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Number of years purchaser allowed to evaluate project per option agreement |  |  |  | 3 years |  |  |
Discount rate used for future cash payments |  |  |  |  |  | 20.00% |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  |  | $ (2,466,000) |  |
Write-down of held for sale asset |  |  |  | $ 0 | 2,466,000 |  |
Puna Operations Inc. |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Useful life of property, plant and equipment |  | 8 years |  | 8 years |  |  |
Plant and equipment |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Construction in progress |  |  |  | $ 17,307,000 | 6,113,000 |  |
Mineral properties subject to depreciation |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Construction in progress |  |  |  | 3,715,000 | $ 1,833,000 |  |
Exploration and evaluation assets | Candelaria project |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Initial proceeds from sale of productive assets |  |  | $ 1,000,000 |  |  |  |
Number of annual installments per option agreement | installment |  |  | 3 |  |  |  |
Annual installment amount per option agreement | $ 1,000,000 |  | $ 1,000,000 |  |  |  |
Exploration and evaluation assets | Berenguela project |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  |  |  |  |  |  | 15.00%
Pirquitas plant assets |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  | 10.00% |  |  |  |  |
Amount unit's asset balance prior to impairments exceeds its carrying amount |  | $ 24,357,000 |  |  |  |  |
Impairment reversal recognized |  |  |  | $ 24,357,000 |  |  |
Seabee Gold Operation |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  |  |  | 2.30% | 2.30% |  |
Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Transfers |  |  |  | $ 0 | $ (10,564,000) |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | 1,646,000 |  |  |
Gross carrying amount | Plant and equipment |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Transfers |  |  |  | 0 | (144,000) |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | 0 |  |  |
Gross carrying amount | Mineral properties subject to depreciation |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Transfers |  |  |  | 45,295,000 | 52,753,000 |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | 747,000 |  |  |
Gross carrying amount | Mineral properties subject to depreciation, net of assets held-for-sale |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Transfers |  |  |  |  | 52,609,000 |  |
Gross carrying amount | Exploration and evaluation assets |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |
Transfers |  |  |  | 0 | $ (23,415,000) |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | $ 899,000 |  |  |

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