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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 82,581 $ 62,048
Less: accumulated depreciation (39,033) (35,925)
Property, plant and equipment, net 43,548 26,123
Land    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment 642 642
Plant facilities    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 50,451 29,750
Plant facilities | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 12 years  
Plant facilities | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 15 years  
Mining equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 21,471 13,019
Mining equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 5 years  
Mining equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 10 years  
Light trucks and utility vehicles    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 3,905 3,256
Estimated Useful Lives 5 years  
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,909 1,754
Office furniture and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 4 years  
Office furniture and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated Useful Lives 7 years  
Construction-in-progress(1)    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 4,203 $ 13,627