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FINANCE COSTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Borrowing costs [abstract] |  |
Interest expense1 | $ 0.0 | $ 9.1
Credit facility fees | 5.2 | 4.8
Accretion Expense, Gold Prepayment | 0.0 | 9.3
Accretion expense - gold prepayment1 | 9.9 | 9.3
Accretion expense - other | 0.0 | 0.1
Finance costs | 5.2 | $ 23.3
Capitalized interest expense | $ 30.6 |

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