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Asset Retirement Obligation - Reconciliation of Total Reclamation Liability for Asset Retirement Obligations (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2022
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
December 31, 2021 $ 16,155
Accretion expense 379
June 30, 2022 24,816
Additions and revisions of prior estimates $ 8,282