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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following is a summary of property, plant and equipment, net:

Estimated
Useful LivesJune 30, 2024December 31, 2023
LandN/A$642 $642 
Plant facilities
12 - 15 years
30,195 29,750 
Mining equipment
5 - 10 years
18,437 13,019 
Light trucks and utility vehicles5 years3,880 3,256 
Office furniture and equipment
4 - 7 years
1,888 1,754 
Construction-in-progress(1)
N/A23,236 13,627 
Total property, plant and equipment$78,278 $62,048 
Less: accumulated depreciation(37,922)(35,925)
Property, plant and equipment, net$40,356 $26,123 
(1)    Costs incurred for commissioning activities for the Companys Phase 1 REE separation circuit at the Mill are capitalized. The Company will offset these costs upon sale of separated neodymium-praseodymium (NdPr) that is produced during commissioning of the Phase 1 REE separation circuit.
Schedule of Summary of Mineral Properties
The following is a summary of mineral properties:
 June 30, 2024December 31, 2023
Sheep Mountain$34,183 $34,183 
Bahia Project31,130 29,130 
Nichols Ranch ISR Project25,974 25,974 
Roca Honda22,095 22,095 
Pinyon Plain9,338 6,512 
Other1,687 1,687 
Total mineral properties$124,407 $119,581 
Less: accumulated depletion$(567)$— 
Mineral properties, net$123,840 $119,581