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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 108,129   $ 108,129   $ 95,925
Less: accumulated depreciation (46,037)   (46,037)   (40,738)
Property, plant and equipment, net 62,092   62,092   55,187
Depreciation $ 1,300 $ 660 $ 3,730 $ 1,950  
Property, Plant, and Equipment, Additional Disclosures no   0.04 million    
Land          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 1,015   $ 1,015   1,015
Plant Facilities          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 65,538   $ 65,538   63,537
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 $ 29,884   $ 29,884   22,187
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 $ 4,468   $ 4,468   4,081
Estimated Useful Lives 5 years   5 years    
Office furniture and equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 1,965   $ 1,965   1,918
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 $ 5,259   $ 5,259   $ 3,187
White Mesa Mill          
Property, Plant and Equipment [Line Items]          
Depreciation $ 570 $ 460 $ 1,570 $ 940