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Restricted Cash and Investments (Details) - CAD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Statement [Line Items] |  |
Restricted cash and investments | $ 11,624 | $ 11,231
Cash and cash equivalents |  |
Statement [Line Items] |  |
Restricted cash and investments | 3,652 | 3,259
Investments |  |
Statement [Line Items] |  |
Restricted cash and investments | 7,972 | 7,972
Elliot Lake reclamation trust fund |  |
Statement [Line Items] |  |
Restricted cash and investments | 3,652 | 3,259
Letters of credit facility pledged assets |  |
Statement [Line Items] |  |
Restricted cash and investments | $ 7,972 | $ 7,972

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