v3.25.2

Investments in associates - Disclosure of associates (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Disclosure of associates [line items] |  |  |  |  |
Current assets |  | $ 147,684 | $ 63,814 |  |
Current liabilities |  | (32,632) | (14,616) |  |
Revenues |  | 277,370 | 191,157 |  |
Other comprehensive income |  | 93,345 | (57,822) |  |
Comprehensive loss |  | $ 299,433 | $ (41,555) |  |
Osisko Development Corp. [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Current assets |  |  |  | $ 42,949 |
Non-current assets |  |  |  | 525,269 |
Current liabilities |  |  |  | (90,842) |
Non-current liabilities |  |  |  | (85,590) |
Net assets |  |  |  | 391,786 | $ 538,570
Revenues |  |  |  | 8,421 |
Net loss |  |  |  | (153,087) |
Other comprehensive income | $ 1,100 |  |  | 1,440 |
Comprehensive loss |  |  |  | $ (151,647) |

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