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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
INCOME TAXES. |  |  |  |
Statutory tax rate (as a percent) |  |  | 35.00% |
Deferred income tax expense due to increased explorations and deferred income tax recovery due to currency devaluation | $ (0.2) |  | $ 2.5 |
Deferred income tax recovery due to currency devaluation |  | $ 0.9 |  | $ 2.7

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