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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)

9 Months Ended

Sep. 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 Lives						September 30, 2024						December 31, 2023
Land			N/A						$	642					$	642
Plant facilities			12 - 15 years						50,451						29,750
Mining equipment			5 - 10 years						21,471						13,019
Light trucks and utility vehicles			5 years						3,905						3,256
Office furniture and equipment			4 - 7 years						1,909						1,754
Construction-in-progress(1)			N/A						4,203						13,627
Total property, plant and equipment									$	82,581					$	62,048
Less: accumulated depreciation									(39,033)						(35,925)
Property, plant and equipment, net									$	43,548					$	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.

Schedule of Summary of Mineral Properties

The following is a summary of mineral properties:

			September 30, 2024						December 31, 2023
Sheep Mountain			$	34,183					$	34,183
Bahia Project			32,613						29,130
Nichols Ranch ISR Project			25,974						25,974
Roca Honda			22,095						22,095
Pinyon Plain			9,338						6,512
Other			1,687						1,687
Total mineral properties			$	125,890					$	119,581
Less: accumulated depletion			$	(1,034)					$	—
Mineral properties, net			$	124,856					$	119,581

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Schedule of Summary of Mineral Properties

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

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