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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Cost $ 59,126 $ 57,915
Accumulated Depreciation (37,611) (35,932)
Net Book Value 21,515 21,983
Nichols Ranch    
Property, Plant and Equipment [Line Items]    
Cost 29,210 29,210
Accumulated Depreciation (19,203) (18,185)
Net Book Value 10,007 11,025
Alta Mesa    
Property, Plant and Equipment [Line Items]    
Cost 13,626 13,626
Accumulated Depreciation (5,451) (4,996)
Net Book Value 8,175 8,630
Equipment and other    
Property, Plant and Equipment [Line Items]    
Cost 16,290 15,079
Accumulated Depreciation (12,957) (12,751)
Net Book Value $ 3,333 $ 2,328