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PROVISIONS - Narrative (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2007
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Export duty, percentage |  |  |  |  |  |  | 10.00%
Tax moratorium, settlement amount |  | $ 1,057,444 |  |  |  |  |
Tax moratorium, settlement amount, undiscounted cash flows |  | $ 68,621 |  |  |  |  |
Tax moratorium, down payment percentage |  | 5.00% |  |  |  |  |
Tax moratorium, installment payment period |  | 60 months |  |  |  |  |
Tax moratorium liability, interest rate |  | 1.50% |  |  |  |  |
Export duties paid |  |  | $ 6,646 | $ 6,646 |  |  |
Total liabilities |  |  | 513,526 | 513,526 | $ 536,809 |  |
Discount rate used for future cash payments |  | 20.00% |  |  |  |  |
Tax moratorium, down payment amount |  | $ 3,431 |  |  |  |  |
Tax moratorium, principal and interest paid |  |  | 13,455 |  |  |  |
Interest expense on tax liabilities |  |  | 7,616 |  |  |  |
Provision for decommissioning, restoration and rehabilitation costs |  |  | $ 58,330 | $ 58,330 | $ 63,909 | $ 58,920 |
Change in the discount rate |  |  |  | 1.00% |  |  |
Increase (decrease) through change in discount rate, other provisions |  |  |  | $ 4,573 |  |  |
Marigold mine |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  |  | 2.60% | 2.60% | 2.60% |  |
Length of settlement |  |  |  | 21 years |  |  |
Puna Operations |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  |  | 9.90% | 9.90% | 9.90% |  |
Length of settlement |  |  |  | 16 years |  |  |
Seabee Gold Operation |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Discount rate used for future cash payments |  |  | 2.30% | 2.30% | 2.30% |  |
Length of settlement |  |  |  | 12 years |  |  |
Gross carrying amount |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Change in estimate of close down and restoration provision |  |  |  | $ (9,128) | $ (42) |  |
Provision for export duty | Amortized cost |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Total liabilities |  | $ (4,303) | $ 67,130 | $ 67,130 |  |  |
Puna Operations Inc. |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |
Useful life of property, plant and equipment | 8 years |  |  | 8 years |  |  |
Provision for decommissioning, restoration and rehabilitation costs |  |  | $ (8,317) | $ (8,317) |  |  |
Amount recorded against carrying value of plant |  |  |  | 8,458 |  |  |
Benefit recognized in income statement |  |  |  | $ 141 |  |  |

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