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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
 3 Months Ended
Mar. 31, 2023
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following is a summary of property, plant and equipment, net:
March 31, 2023December 31, 2022
CostAccumulated
Depreciation		Net Book ValueCostAccumulated
Depreciation		Net Book
Value
Property, plant and equipment
Nichols Ranch$29,210 $(20,730)$8,480 $29,210 $(20,221)$8,989 
Pinyon Plain2,058 (746)1,312 1,617 (714)903 
Equipment and other17,196 (12,353)4,843 15,009 (12,239)2,770 
Property, plant and equipment total$48,464 $(33,829)$14,635 $45,836 $(33,174)$12,662 

As of December 31, 2022, the net book value of the property, plant and equipment attributable to Alta Mesa was $8.21 million, which was 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:
 March 31, 2023December 31, 2022
Mineral properties
Sheep Mountain$34,183 $34,183 
Bahia Project29,124 — 
Uranerz ISR properties 25,974 25,974 
Roca Honda 22,095 22,095 
Pinyon Plain1,171 — 
Other 1,287 1,287 
Mineral properties total$113,834 $83,539