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RECLAMATION LIABILITIES - Change in Reclamation Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclamation Liabilities [Roll Forward]      
Balance, beginning of year  $ 125,044 $ 104,744  
Reclamation expenditures  (1,221) (243)  
Accretion expense   6,035 4,821 $ 3,815
Additions, changes in estimate and other 34,189 15,722  
Balance, end of year  164,047 125,044 $ 104,744
Less: current portion  (10,075) (2,384)  
Non-current reclamation liabilities $ 153,972 $ 122,660