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Segmented Information (Tables) | 12 Months Ended
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Dec. 31, 2024
Disclosure of entity's operating segments [Abstract] |
Disclosure of operating segments [text block] |
Year Ended December 31, 2024
| Young-Davidson | Island Gold | Magino 3 | Mulatos 1 | Corporate /other 2 | Total
Operating revenues | $415.3 |  | $363.1 |  | $81.2 |  | $487.3 |  | — |  | $1,346.9 |
Cost of sales |  |  |  |  |  |
Mining and processing | 178.4 |  | 87.7 |  | 55.8 |  | 197.0 |  | — |  | 518.9 |
Royalties | 6.2 |  | 3.2 |  | 2.0 |  | 2.4 |  | — |  | 13.8 |
Amortization | 77.3 |  | 41.3 |  | 16.1 |  | 83.7 |  | — |  | 218.4 |
| 261.9 |  | 132.2 |  | 73.9 |  | 283.1 |  | — |  | 751.1 |
Expenses |  |  |  |  |  |
Exploration | 3.0 |  | 5.0 |  | 0.7 |  | 13.1 |  | 4.9 |  | 26.7 |
Corporate and administrative | — |  | — |  | — |  | — |  | 32.6 |  | 32.6 |
Share-based compensation | — |  | — |  | — |  | — |  | 31.7 |  | 31.7 |
Reversal of impairment | (57.1) |  | — |  | — |  | — |  | — |  | (57.1) |
Earnings (loss) from operations | $207.5 |  | $225.9 |  | $6.6 |  | $191.1 |  | ($69.2) |  | $561.9 |
Finance expense |  |  |  |  |  | (3.8) |
Foreign exchange gain |  |  |  |  |  | 8.0 |
Unrealized loss on commodity derivatives |  |  |  |  |  | (24.2) |
Other loss |  |  |  |  |  | (39.7) |
Earnings before income taxes |  |  |  |  |  | $502.2 |
Year Ended December 31, 2023
| Young-Davidson | Mulatos 1 | Island Gold | Corporate/other 2 | Total
Operating revenues | $355.3 |  | $420.2 |  | $247.8 |  | — |  | $1,023.3 |
Cost of sales |  |  |  |  |
Mining and processing | 166.2 |  | 188.4 |  | 82.7 |  | — |  | 437.3 |
Royalties | 5.3 |  | 2.2 |  | 2.7 |  | — |  | 10.2 |
Amortization | 76.7 |  | 75.3 |  | 38.2 |  | — |  | 190.2 |
| 248.2 |  | 265.9 |  | 123.6 |  | — |  | 637.7 |
Expenses |  |  |  |  |
Exploration | 2.9 |  | 9.9 |  | 3.7 |  | 1.7 |  | 18.2 |
Corporate and administrative | — |  | — |  | — |  | 27.6 |  | 27.6 |
Share-based compensation | — |  | — |  | — |  | 21.7 |  | 21.7 |
Earnings (loss) from operations | $104.2 |  | $144.4 |  | $120.5 |  | ($51.0) |  | $318.1 |
Finance expense |  |  |  |  | (2.5) |
Foreign exchange gain |  |  |  |  | 1.9 |
Unrealized loss on commodity derivatives |  |  |  |  | (0.9) |
Other loss |  |  |  |  | (22.9) |
Earnings before income taxes |  |  |  |  | $293.7 |
1. Mulatos includes the La Yaqui Grande operation. 2. Corporate and other consists of corporate balances and exploration, development projects and mines in reclamation. 3. The results for Magino are for Alamos’ ownership period from July 12, 2024 to December 31, 2024. (b) Segment assets and liabilities
| Total Assets | Total liabilities
| December 31, 2024 | December 31, 2023 | December 31, 2024 | December 31, 2023
Young-Davidson | $1,758.6 |  | $1,693.2 |  | $459.8 |  | $381.8 |
Island Gold | 1,683.1 |  | 1,453.6 |  | 534.5 |  | 476.4 |
Magino | 1,073.5 |  | — |  | 37.9 |  | — |
Mulatos 1 | 540.9 |  | 631.5 |  | 160.4 |  | 172.7 |
Corporate/other 2 | 280.0 |  | 222.9 |  | 559.3 |  | 46.8 |
Total assets and liabilities | $5,336.1 | $4,001.2 | $1,751.9 | $1,077.7
1. Mulatos includes the La Yaqui Grande operation. 2. Corporate and other consists of corporate balances, exploration and development projects and mines in reclamation

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- Definition The disclosure of operating segments. [Refer: Operating segments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23&doctype=Standard -URIDate 2024-03-27 + Details
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