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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) - USD ($)
6 Months Ended
Sep. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 23, 2026
Dec. 31, 2025
Mar. 31, 2014
Other Commitments [Line Items]            
Licensing condition, obligated stevedoring charge per tonne           $ 1
Damages sought, value $ 4,600,000          
Damages paid, value 1,400,000          
Damages held in escrow, value $ 3,200,000          
Loss contingency, estimate of possible loss   $ 22,850,000     $ 22,470,000  
Asset retirement obligation   23,531,000     22,195,000  
Deferred financing costs paid   3,993,000 $ 0      
Secured Debt | Commitment Letter            
Other Commitments [Line Items]            
Aggregate principal amount       $ 250,000,000    
Deferred financing costs paid   3,750,000        
Mining Properties and Mineral Rights            
Other Commitments [Line Items]            
Renewal costs   2,410,000        
Canyon Project            
Other Commitments [Line Items]            
Asset retirement obligation   $ 47,520,000     $ 50,490,000