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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
 9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following is a summary of property, plant and equipment, net:
September 30, 2023December 31, 2022
CostAccumulated
Depreciation		Net Book ValueCostAccumulated
Depreciation		Net Book
Value
Property, plant and equipment
Nichols Ranch$29,210 $(21,747)$7,463 $29,210 $(20,221)$8,989 
Pinyon Plain3,288 (846)2,442 1,617 (714)903 
Equipment and other22,895 (12,592)10,303 15,009 (12,239)2,770 
Property, plant and equipment total$55,393 $(35,185)$20,208 $45,836 $(33,174)$12,662 

As of December 31, 2022, the net book value of the property, plant and equipment attributable to the Alta Mesa ISR Project “Alta Mesa”), which the Company sold to enCore effective February 14, 2023, was $8.21 million and is included in Property, plant and equipment and other assets held for sale, net on the Condensed Consolidated Balance Sheets.
Schedule of Summary of Mineral Properties
The following is a summary of mineral properties:
 September 30, 2023December 31, 2022
Mineral properties
Sheep Mountain$34,183 $34,183 
Bahia Project29,130 — 
Nichols Ranch ISR Project25,974 25,974 
Roca Honda 22,095 22,095 
Pinyon Plain4,427 — 
Other 1,287 1,287 
Mineral properties total$117,096 $83,539