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Segmented Information (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure of entity's operating segments [Abstract]  
Disclosure of operating segments [text block]
Year Ended December 31, 2024
Young-DavidsonIsland Gold
Magino3
Mulatos1
Corporate /other2
Total
Operating revenues$415.3 $363.1 $81.2 $487.3 — $1,346.9 
Cost of sales
Mining and processing178.4 87.7 55.8 197.0 — 518.9 
Royalties6.2 3.2 2.0 2.4 — 13.8 
Amortization77.3 41.3 16.1 83.7 — 218.4 
261.9 132.2 73.9 283.1 — 751.1 
Expenses
Exploration3.0 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 gain8.0 
Unrealized loss on commodity derivatives(24.2)
Other loss(39.7)
Earnings before income taxes$502.2 
Year Ended December 31, 2023
Young-Davidson
Mulatos1
Island Gold
Corporate/other2
Total
Operating revenues$355.3 $420.2 $247.8 — $1,023.3 
Cost of sales
Mining and processing166.2 188.4 82.7 — 437.3 
Royalties5.3 2.2 2.7 — 10.2 
Amortization76.7 75.3 38.2 — 190.2 
248.2 265.9 123.6 — 637.7 
Expenses
Exploration2.9 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 gain1.9 
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 AssetsTotal liabilities
December 31, 2024December 31, 2023December 31, 2024December 31, 2023
Young-Davidson$1,758.6 $1,693.2 $459.8 $381.8 
Island Gold1,683.1 1,453.6 534.5 476.4 
Magino1,073.5 — 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