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INCOME AND MINING TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018
INCOME AND MINING TAXES. |  |  |
Statutory tax rate (as a percent) | 35.00% |  | 21.00%
Deferred income tax recovery due to increased explorations | $ 1.2 | $ 1.6 |

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