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RECLAMATION AND REMEDIATION LIABILITIES - Reclamation and Remediation Liabilities rollforward (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Changes in the reclamation and remediation liability    
Reclamation and remediation liabilities, beginning balance $ 46,063 $ 43,021
Acquisitions and divestitures   256
Settlements (341) (740)
Accretion of liability 1,535 2,757
Revisions to estimates and discount rate (244) 1,959
Foreign exchange revaluation 916 (1,190)
Reclamation and remediation liabilities, ending balance 47,929 46,063
Less: current portion 6,875 4,988
Long-term portion $ 41,054 $ 41,075