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RECLAMATION AND REMEDIATION LIABILITIES - Reclamation and Remediation Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Reclamation Liabilities [Roll Forward]          
Balance as of January 1     $ 345,837 $ 173,819  
Additions     220,974 261,674  
Changes in estimate and other     65,363 11,054  
Expenditures      (17,291) (127,219)  
Accretion expense     18,249 7,243  
Balance as of September 30 $ 633,132 $ 326,571 633,132 326,571  
Less: current  portion  (28,307) (94,110) (28,307) (94,110) $ (33,166)
Non-current reclamation and remediation liabilities 604,825 232,461 604,825 232,461 $ 312,671
Çöpler Incident          
Reclamation Liabilities [Roll Forward]          
Changes in estimate and other     12,900    
Reclamation          
Reclamation Liabilities [Roll Forward]          
Balance as of January 1     209,923 173,819  
Additions     220,974 0  
Changes in estimate and other     11,856 11,054  
Expenditures      (4,259) (1,913)  
Accretion expense 7,059 2,414 18,249 7,243  
Balance as of September 30 456,743 190,203 456,743 190,203  
Less: current  portion  (13,228) (11,765) (13,228) (11,765)  
Non-current reclamation and remediation liabilities 443,515 178,438 443,515 178,438  
Reclamation | Çöpler Incident          
Reclamation Liabilities [Roll Forward]          
Changes in estimate and other     9,400    
Remediation          
Reclamation Liabilities [Roll Forward]          
Balance as of January 1     135,914 0  
Additions     0 261,674  
Changes in estimate and other     53,507 0  
Expenditures      (13,032) (125,306)  
Accretion expense     0 0  
Balance as of September 30 176,389 136,368 176,389 136,368  
Less: current  portion  (15,079) (82,345) (15,079) (82,345)  
Non-current reclamation and remediation liabilities $ 161,310 $ 54,023 161,310 $ 54,023  
Remediation | Marigold          
Reclamation Liabilities [Roll Forward]          
Changes in estimate and other     2,500    
Remediation | Çöpler Incident          
Reclamation Liabilities [Roll Forward]          
Changes in estimate and other     $ 53,500