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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Disclosure of significant accounting policies [Abstract] |
Schedule of Subsidiaries | These consolidated financial statements include the accounts of the Company and its subsidiaries. Subsidiaries are entities controlled by the Company, and are wholly-owned. Control exists when the Company is exposed, or has rights, to variable returns from its involvement with the investee and has the ability to affect those returns through its power over the investee. Subsidiaries are included in the consolidated financial results of the Company from the effective date of acquisition up to the effective date of disposition or loss of control. The Company's principal properties and material subsidiaries of the Company and their geographic locations at December 31, 2023 were as follows:
Direct parent company |  | Country of incorporation | Mining properties and projects owned
Alamos Gold Inc |  | Canada | Island Gold Mine Young-Davidson Mine Lynn Lake project
Minas de Oro Nacional, S.A. de C.V. |  | Mexico | The Mulatos District
Dogu Biga Madencilik Sanayi Ticaret AS |  | Türkiye | Turkish properties
Disclosure of detailed information about property, plant and equipment | Amortization rates applicable to each category of property, plant and equipment, with the exception of land, are as follows:
Asset | Useful life
Leasehold improvements | Lease term
Mobile equipment | 2-10 years
Other equipment | 2-20 years
Processing plant | Unit-of-production
Shaft, underground infrastructure and mineral properties | Unit-of-production
Vehicles | 3-7 years
Buildings | 7-20 years
Office equipment | 2-8 years
|  | Mineral property |  |
| Plant and equipment | Depletable | Non-depletable | Exploration and evaluation | Total
Cost |  |  |  |  |
At December 31, 2021 | $1,629.3 |  | $2,631.2 |  | $285.6 |  | $319.3 |  | $4,865.4 |
Additions | 40.2 |  | 143.8 |  | 123.7 |  | 22.1 |  | 329.8 |
Transfer of La Yaqui Grande assets 1 | 121.0 |  | 19.0 |  | (140.0) |  | — |  | — |
Revisions to decommissioning liabilities | — |  | 6.7 |  | — |  | — |  | 6.7 |
Disposals | (1.7) |  | — |  | — |  | — |  | (1.7) |
Sale of Esperanza Project | (0.4) |  | — |  | — |  | (89.6) |  | (90.0) |
At December 31, 2022 | $1,788.4 |  | $2,800.7 |  | $269.3 |  | $251.8 |  | $5,110.2 |
Additions | 51.5 |  | 109.5 |  | 174.7 |  | 32.2 |  | 367.9 |
Acquisition of Manitou Gold Inc. (i) | — |  | — |  | — |  | 20.0 |  | 20.0 |
Transfers | 4.0 |  | — |  | (4.0) |  | — |  | — |
Revisions to decommissioning liabilities (note 11) | — |  | 8.6 |  | — |  | — |  | 8.6 |
Disposals | (35.5) |  | (1.3) |  | — |  | (1.4) |  | (38.2) |
At December 31, 2023 | $1,808.4 |  | $2,917.5 |  | $440.0 |  | $302.6 |  | $5,468.5 |
Accumulated amortization and impairment charges |  |  |
At December 31, 2021 | $717.8 |  | $811.8 |  | 142.4 |  | $84.9 |  | $1,756.9 |
Amortization | 91.7 |  | 89.4 |  | — |  | — |  | 181.1 |
Disposals | (1.2) |  | — |  | — |  | — |  | (1.2) |
Impairment expense on Esperanza Project (iv) | — |  | — |  | — |  | 38.2 |  | 38.2 |
Sale of Esperanza Project (iv) | (0.4) |  | — |  | — |  | (38.2) |  | (38.6) |
At December 31, 2022 | $807.9 |  | $901.2 |  | $142.4 |  | $84.9 |  | $1,936.4 |
Amortization | 106.6 |  | 101.0 |  | — |  | — |  | 207.6 |
Disposals | (34.3) |  | (1.3) |  | — |  | — |  | (35.6) |
At December 31, 2023 | $880.2 |  | $1,000.9 |  | $142.4 |  | $84.9 |  | $2,108.4 |
Net carrying value |  |  |  |  |
At December 31, 2022 | $980.5 |  | $1,899.5 |  | $126.9 |  | $166.9 |  | $3,173.8 |
At December 31, 2023 | $928.2 |  | $1,916.6 |  | $297.6 |  | $217.7 |  | $3,360.1 |
1.La Yaqui Grande commenced commercial production on June 20, 2022. The net carrying values and capital additions by segment (note 17) are as follows:
| December 31, 2023 | December 31, 2022 |
| Mineral Property, Plant and Equipment | Capital additions for the year ended 1 | Mineral Property, Plant and Equipment | Capital additions for the year ended 1 |
Young-Davidson | $1,500.3 |  | $73.5 |  | 1,504.7 |  | 68.4 |  |
Island Gold | 1,397.7 |  | 243.4 |  | 1,174.6 |  | 185.1 |  |
Mulatos | 293.0 |  | 29.9 |  | 343.8 |  | 58.8 |  |
Corporate and other | 169.1 |  | 21.1 |  | 150.7 |  | 17.5 |  |
| $3,360.1 |  | $367.9 |  | $3,173.8 |  | $329.8 |  |
1.Segment capital additions are presented on an accrual basis. Mineral property, plant and equipment in the consolidated statements of cash flows are presented on a cash expenditure basis.
Schedule of Investments By Classification |
Asset / Liability |  |
Cash and cash equivalents |  | Amortized cost
Equity securities |  | Fair value through OCI
Amounts receivable |  | Amortized cost
Accounts payable and accrued liabilities |  | Amortized cost
Debt and financing obligations |  | Amortized cost
Non-hedged derivatives |  | Fair value through profit or loss
Cash flow hedging derivatives |  | Fair value through OCI
Esperanza Milestone Payments |  | Fair value through profit or loss

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