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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 66,690 $ 62,048
Less: accumulated depreciation (36,891) (35,925)
Property, plant and equipment, net 29,799 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 $ 29,756 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 $ 17,379 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 $ 3,650 3,256
Estimated Useful Lives 5 years  
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 1,773 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    
Property, Plant and Equipment [Line Items]    
Total property, plant and equipment $ 13,490 $ 13,627