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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 101,426   $ 101,426   $ 95,925
Less: accumulated depreciation (44,167)   (44,167)   (40,738)
Property, plant and equipment, net 57,259   57,259   55,187
Depreciation 1,250 $ 620 $ 2,430 $ 1,290  
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 $ 65,523   $ 65,523   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 $ 27,251   $ 27,251   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 $ 4,240   $ 4,240   4,081
Estimated Useful Lives 5 years   5 years    
Office furniture and equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 1,920   $ 1,920   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 $ 1,477   $ 1,477   $ 3,187
White Mesa Mill          
Property, Plant and Equipment [Line Items]          
Depreciation $ 530 $ 410 $ 1,000 $ 480