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CASH FLOW ITEMS (Tables) | 12 Months Ended
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Dec. 31, 2024
Cash Flow Statement [Abstract] |
Adjustments for Other Non-cash Items Within Operating Activities | (a)Adjustments for other non-cash items within operating activities
|  |  | Years ended December 31,
| Notes |  |  | 2024 | 2023
Share-based compensation |  |  |  | $ | 5.7 |  | $ | 6.2 |
9.7% of Côté Gold pre-Commercial Production gold received by SMM | 31 |  |  | (18.4) |  | — |
9.7% of Côté Gold expenses funded by SMM | 31 |  |  | 6.6 |  | — |
Write-down (reversal) of inventories |  |  |  | 3.6 |  | 5.9 |
Changes in estimates of asset retirement obligations at closed sites | 29 |  |  | (13.4) |  | 9.7 |
Derivative (gain) loss |  |  |  | (20.4) |  | (22.9) |
Interest income | 31 |  |  | (16.1) |  | (27.8) |
Gain on sale of Pitangui and Acurui Projects | 31 |  |  | — |  | (15.5) |
Effects of exchange rate fluctuation on cash and cash equivalents |  |  |  | 7.0 |  | (1.3) |
Effects of exchange rate fluctuation on restricted cash |  |  |  | 4.1 |  | (2.8) |
Insurance recoveries | 31 |  |  | (27.3) |  | (0.6) |
Other |  |  |  | (12.0) |  | 6.6 |
|  |  |  | $ | (80.6) |  | $ | (42.5) |
Movements in Non-cash Working Capital Items and Non-current Ore Stockpiles | Movements in non-cash working capital items and non-current ore stockpiles
|  | Years ended December 31,
|  |  | 2024 | 2023
Receivables and other current assets |  |  | $ | (45.6) |  | $ | 18.0 |
Inventories and non-current ore stockpiles |  |  | (51.4) |  | (76.6) |
Accounts payable and accrued liabilities |  |  | (17.4) |  | 43.7 |
|  |  | $ | (114.4) |  | $ | (14.9) |
Schedule of Other Investing Activities | Other investing activities
|  |  | Years ended December 31,
| Notes |  |  | 2024 | 2023
Interest received |  |  |  | $ | 18.1 |  | $ | 26.3 |
Fayolle royalty payment |  |  |  | — |  | (1.1) |
(Increase) decrease in restricted cash |  |  |  | (6.2) |  | (31.0) |
Capital expenditures for exploration and evaluation assets |  |  |  | (1.0) |  | — |
Disposal of marketable securities |  |  |  | 8.2 |  | (0.4) |
Other |  |  |  | (0.6) |  | 0.9 |
|  |  |  | $ | 18.5 |  | $ | (5.3) |
Schedule Of Other Financing Activities | Other financing activities
|  |  | Years ended December 31,
| Notes |  |  | 2024 | 2023
Interest paid | 30 |  |  | $ | (13.8) |  | $ | — |
Dividends paid to non-controlling interests |  |  |  | (18.0) |  | (13.7) |
Proceeds from issuance of flow-through common shares | 23(b) |  |  | 5.9 |  | — |
Repayment of equipment loans | 18(d) |  |  | (5.1) |  | (9.2) |
Payment of lease obligations | 15 |  |  | (20.6) |  | (6.0) |
Common shares issued for cash on exercise of stock options |  |  |  | 6.1 |  | 0.4 |
Other |  |  |  | (13.5) |  | (18.9) |
|  |  |  | $ | (59.0) |  | $ | (47.4) |
Reconciliation of Long-term Debt Arising From Financing Activities | Reconciliation of long-term debt arising from financing activities
|  | Equipment loans | 5.75% senior notes | Credit facility | Term Loan | Total
Balance, January 1, 2023 |  | $ | 16.1 |  | $ | 447.6 |  | $ | 455.0 |  | $ | — |  | $ | 918.7 |
Cash changes: |  |  |  |  |  |
Proceeds |  | — |  | — |  | — |  | 400.0 |  | 400.0 |
Deferred transaction costs |  | — |  | — |  | — |  | (23.0) |  | (23.0) |
Repayments |  | (9.2) |  | — |  | (455.0) |  | — |  | (464.2) |
Non-cash changes: |  |  |  |  |  |
Amortization of deferred financing charges |  | 0.1 |  | 0.9 |  | — |  | 2.8 |  | 3.8 |
Foreign currency translation |  | 0.2 |  | — |  | — |  | — |  | 0.2 |
Change in fair value of embedded derivative |  | — |  | — |  | — |  | (4.1) |  | (4.1) |
Other |  | — |  | (0.5) |  | — |  | (0.1) |  | (0.6) |
Balance, December 31, 2023 |  | $ | 7.2 |  | $ | 448.0 |  | $ | — |  | $ | 375.6 |  | $ | 830.8 |
Cash changes: |  |  |  |  |  |
Draws |  | — |  | — |  | 280.0 |  | — |  | 280.0 |
Repayments |  | (5.1) |  | — |  | (60.0) |  | — |  | (65.1) |
Non-cash changes: |  |  |  |  |  |
Amortization of deferred financing charges |  | — |  | 0.9 |  | — |  | 4.4 |  | 5.3 |
Change in fair value of embedded derivative |  | — |  | — |  | — |  | (21.6) |  | (21.6) |
Other |  | — |  | (0.5) |  | — |  | — |  | (0.5) |
Balance, December 31, 2024 |  | $ | 2.1 |  | $ | 448.4 |  | $ | 220.0 |  | $ | 358.4 |  | $ | 1,028.9 |

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