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Reclamation Liability - Movements in the environmental reclamation liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reclamation Liability    
Additions   $ 1,524
Work performed on early action items   (2,289)
Balance at end of year $ 534  
Administrative Settlement Agreement and Order on Consent    
Reclamation Liability    
Balance at beginning of year $ 0 765
Additions   $ 1,524
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag true true
Work performed on early action items $ 0 $ (2,289)
Balance at end of year $ 0 $ 0