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RECLAMATION PROVISION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
RECLAMATION PROVISION |  |
Long-term, beginning of year | $ 265,308 |
Current, beginning of year | 9,193 |
Reclassification from long-term to current, end of year | (10,038) | $ (9,193)
Long-term, end of year | 345,268 | 265,308
Asset retirement obligation |  |
RECLAMATION PROVISION |  |
Long-term, beginning of year | 259,706 | 269,068
Current, beginning of year | 5,953 | 4,443
Current year additions and changes in estimate, net | 58,891 | (9,112)
Current year accretion | 5,247 | 3,847
Liabilities settled | (1,115) | (1,113)
Foreign exchange revaluation | 21,004 | (1,474)
Reclassification from long-term to current, end of year | (8,609) | (5,953)
Long-term, end of year | 341,077 | 259,706
Environmental remediation liability |  |
RECLAMATION PROVISION |  |
Long-term, beginning of year | 5,602 | 7,231
Current, beginning of year | 3,240 | 1,802
Current year additions and changes in estimate, net | 850 | 243
Liabilities settled | (4,559) | (1,606)
Foreign exchange revaluation | 487 | 1,172
Reclassification from long-term to current, end of year | (1,429) | (3,240)
Long-term, end of year | $ 4,191 | $ 5,602
Minimum |  |
RECLAMATION PROVISION |  |
Discount rate used in reclamation provision | 1.14% | 0.74%
Maximum |  |
RECLAMATION PROVISION |  |
Discount rate used in reclamation provision | 2.39% | 2.35%

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