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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, Plant and Equipment
The following is a summary of property, plant and equipment, net:
EstimatedDecember 31,
Useful Lives20242023
LandN/A$1,015 $642 
Plant facilities
12 - 15 years
63,537 29,750 
Mining equipment
5 - 10 years
22,187 13,019 
Light trucks and utility vehicles5 years4,081 3,256 
Office furniture and equipment
4 - 7 years
1,918 1,754 
Construction-in-progress(1)
N/A3,187 13,627 
Total property, plant and equipment$95,925 $62,048 
Less: accumulated depreciation(40,738)(35,925)
Property, plant and equipment, net$55,187 $26,123 
(1) Costs incurred for commissioning activities for the Company's 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. The Company's Phase 1 REE separation circuit was placed into service on October 1, 2024.
Schedule of Summary of Mineral Properties
The following is a summary of mineral properties:
December 31,
 20242023
Toliara Project$153,510 $— 
Sheep Mountain34,183 34,183 
Bahia Project32,613 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$279,400 $119,581 
Less: accumulated depletion(1,070)— 
Mineral properties, net$278,330 $119,581