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IMPAIRMENT AND IMPAIRMENT REVERSALS (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 $ / $ $ / oz | Dec. 31, 2016 USD ($) $ / $ $ / oz
Canadian Malartic joint operation |  |
Impairment Reversals |  |
Nominal discount rate (as a percent) |  | 6.00%
Estimate of future gold price | $ / oz | 1,300 | 1,250
Inflation rate (as a percent) | 2.00% |
Canadian Malartic joint operation | Minimum |  |
Impairment Reversals |  |
Nominal discount rate (as a percent) | 5.75% |
Foreign exchange rates | 0.78 | 0.75
Canadian Malartic joint operation | Maximum |  |
Impairment Reversals |  |
Nominal discount rate (as a percent) | 9.00% |
Foreign exchange rates | 0.80 | 0.80
Meadowbank mine |  |
Impairment Reversals |  |
Nominal discount rate (as a percent) |  | 7.25%
Estimate of future gold price | $ / oz |  | 1,250
Inflation rate (as a percent) | 2.00% |
Impairment loss | $ |  | $ 0
Gain on impairment reversal | $ |  | 37,200
Net of tax for gain on impairment reversal | $ |  | $ 27,600
Meadowbank mine | Minimum |  |
Impairment Reversals |  |
Foreign exchange rates |  | 0.75
Meadowbank mine | Maximum |  |
Impairment Reversals |  |
Foreign exchange rates |  | 0.80
Meliadine project |  |
Impairment Reversals |  |
Nominal discount rate (as a percent) |  | 9.00%
Estimate of future gold price | $ / oz |  | 1,250
Inflation rate (as a percent) | 2.00% |
Gain on impairment reversal | $ |  | $ 83,000
Net of tax for gain on impairment reversal | $ |  | $ 53,600
Meliadine project | Minimum |  |
Impairment Reversals |  |
Foreign exchange rates |  | 0.75
Meliadine project | Maximum |  |
Impairment Reversals |  |
Foreign exchange rates |  | 0.80

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