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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Other Commitments [Line Items]    
Asset retirement obligation $ 11,688 $ 10,922
Mining Properties and Mineral Rights    
Other Commitments [Line Items]    
Renewal costs 1,010  
Canyon Project    
Other Commitments [Line Items]    
Loss contingency, estimate of possible loss 17,920 17,580
Asset retirement obligation $ 33,710 $ 33,380