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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 126,079   $ 126,079   $ 117,754
Less: accumulated depreciation (51,889)   (51,889)   (47,959)
Property, plant and equipment, net 74,190   74,190   69,795
Depreciation 1,450 $ 1,250 2,790 $ 2,430  
Land          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 7,416   7,416   7,416
Plant facilities          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 66,934   $ 66,934   66,053
Plant facilities | Minimum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 12 years   12 years    
Plant facilities | Maximum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 15 years   15 years    
Mining equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 30,229   $ 30,229   28,329
Mining equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 5 years   5 years    
Mining equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 10 years   10 years    
Light trucks and utility vehicles          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 5,004   $ 5,004   4,635
Estimated Useful Lives 5 years   5 years    
Office furniture and equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 2,128   $ 2,128   1,985
Office furniture and equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 4 years   4 years    
Office furniture and equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Estimated Useful Lives 7 years   7 years    
Construction-in-progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 14,368   $ 14,368   $ 9,336