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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 120,384   $ 117,754
Less: accumulated depreciation (49,951)   (47,959)
Property, plant and equipment, net 70,433   69,795
Depreciation 1,340 $ 1,180  
Land      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 7,416   7,416
Plant facilities      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 67,025   66,053
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 $ 29,725   28,329
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 $ 4,865   4,635
Estimated Useful Lives 5 years    
Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 2,086   1,985
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 $ 9,267   $ 9,336