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v3.26.1

Background and basis of preparation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Investments subject to significant influence |  |  |
Proceeds from sale of a subsidiary | $ 0 | $ 9,696 |
Revision of Prior Period, Error Correction, Adjustment |  |  |
Investments subject to significant influence |  |  |
Proceeds from sale of a subsidiary |  | $ 9,700 |
Subsidiaries | VRB Energy Inc |  |  |
Investments subject to significant influence |  |  |
Subsidiary, ownership percentage, parent | 90.00% |  | 90.00%
Subsidiaries | Computational Geosciences Inc |  |  |
Investments subject to significant influence |  |  |
Subsidiary, ownership percentage, parent | 94.30% |  | 94.30%
Subsidiaries | Cordoba Minerals Corp |  |  |
Investments subject to significant influence |  |  |
Subsidiary, ownership percentage, parent | 59.30% |  | 60.80%
Maaden Joint Venture |  |  |
Investments subject to significant influence |  |  |
Ownership percentage | 50.00% |  |
VRB China | VRB Energy Inc |  |  |
Investments subject to significant influence |  |  |
Ownership percentage | 49.00% |  |

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