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INCOME AND MINING TAXES - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | $ 728.2 | $ 783.9
Other temporary differences [member] |  |
INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | 40.3 |
Mining Tax [Member] |  |
INCOME AND MINING TAXES |  |
Unused tax losses for which no deferred tax asset recognised | 534.1 | $ 634.6
Canada [Member] |  |
INCOME AND MINING TAXES |  |
Unused Capital Losses For Which No Deferred Tax Assets Recognized | 139.9 |
Canada [Member] | Unused Capital Losses [Member] |  |
INCOME AND MINING TAXES |  |
Unused Capital Losses For Which No Deferred Tax Assets Recognized | $ 139.9 |

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