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ASSET RETIREMENT OBLIGATIONS - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Asset retirement and mine closing liability    
Balance at the beginning of the period $ 150,443 $ 149,813
Accretion expense 4,528 4,433
Payments (1,770) (2,317)
Allocation of liability associated with mine development and change in assumptions 5,576 (1,486)
Balance at the end of the period $ 158,777 $ 150,443