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Asset Retirement Obligation - Reconciliation of Total Reclamation Liability for Asset Retirement Obligations (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2025
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
December 31, 2024 $ 21,292
Accretion expense 562
June 30, 2025 $ 21,854