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Expenses (Tables) | 12 Months Ended
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Dec. 31, 2024
EXPENSES [Abstract] |
Schedule of expenses by nature | (a) Operating expenses by nature
|  | Year ended December 31
(in millions of U.S. dollars) |  |  | 2024 | 2023
OPERATING EXPENSES BY NATURE |  |  |  |
Raw materials and consumables |  |  | 170.3 |  | 182.3 |
Salaries and employee benefits |  |  | 176.1 |  | 144.4 |
Contractors |  |  | 90.0 |  | 105.4 |
Repairs and maintenance |  |  | 69.0 |  | 67.0 |
General and administrative |  |  | 29.1 |  | 25.8 |
Leases |  |  | 9.4 |  | 4.5 |
Royalties |  |  | 9.3 |  | 8.4 |
Drilling and analytical |  |  | 3.5 |  | 6.8 |
Ore purchase costs |  |  | 1.8 |  | 6.8 |
Other |  |  | 9.5 |  | 11.3 |
Total production expenses |  |  | 568.0 |  | 562.7 |
Less: Production expenses capitalized |  |  | (121.6) |  | (112.1) |
Less: Change in inventories |  |  | (10.1) |  | (0.2) |
Total operating expenses |  |  | 436.3 |  | 450.4 |
Schedule of finance costs and income | (b) Finance costs and income
|  | Year ended December 31
(in millions of U.S. dollars) |  |  | 2024 | 2023
FINANCE INCOME |  |  |  |
Interest income |  |  | 6.9 |  | 7.5 |
FINANCE COSTS |  |  |  |
Interest on senior unsecured notes |  |  | 30.0 |  | 30.0 |
Accretion |  |  | 4.7 |  | 4.7 |
Other finance costs |  |  | 9.3 |  | 6.2 |
Total finance costs |  |  | 44.0 |  | 40.9 |
Less: amounts included in cost of qualifying assets |  |  | (26.9) |  | (27.7) |
Total finance costs |  |  | 17.1 |  | 13.2 |
Schedule of other (losses) and gains | (c) Other (losses) and gains
|  | Year ended December 31
(in millions of U.S. dollars) |  |  | 2024 | 2023
OTHER (LOSSES) AND GAINS |  |  |  |
Gain (loss) on foreign exchange |  |  | 13.0 |  | (3.1) |
Loss on disposal of assets |  |  | (1.3) |  | (0.3) |
Loss on revaluation of investments |  |  | (0.9) |  | (4.4) |
Unrealized loss on revaluation of non-current derivative financial liabilities (Note 10) |  |  | (130.6) |  | (108.2) |
Gain on extinguishment of New Afton free cash flow interest obligation (Note 10) |  |  | 42.3 |  | — |
(Loss) gain on foreign exchange derivative |  |  | (9.3) |  | 3.0 |
Gain (loss) on fuel hedge swap contracts |  |  | 1.1 |  | (1.4) |
Other |  |  | (3.2) |  | (0.9) |
Total other losses |  |  | (88.9) |  | (115.3) |

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