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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Cost $ 51,920 $ 45,836
Accumulated Depreciation (34,493) (33,174)
Net Book Value 17,427 12,662
Nichols Ranch    
Property, Plant and Equipment [Line Items]    
Cost 29,210 29,210
Accumulated Depreciation (21,238) (20,221)
Net Book Value 7,972 8,989
Alta Mesa(1)    
Property, Plant and Equipment [Line Items]    
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment   8,210
Pinyon Plain    
Property, Plant and Equipment [Line Items]    
Cost 2,437 1,617
Accumulated Depreciation (784) (714)
Net Book Value 1,653 903
Equipment and other    
Property, Plant and Equipment [Line Items]    
Cost 20,273 15,009
Accumulated Depreciation (12,471) (12,239)
Net Book Value $ 7,802 $ 2,770