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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT (Tables) | 3 Months Ended
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Mar. 31, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Summary of Mineral Properties | The following table is a summary of mineral properties:
| March 31, 2025 |  | December 31, 2024
Toliara Project | $ | 159,092 |  |  | $ | 153,510 |
Sheep Mountain | 34,183 |  |  | 34,183 |
Bahia Project | 32,613 |  |  | 32,613 |
Nichols Ranch ISR Project | 25,974 |  |  | 25,974 |
Roca Honda | 22,095 |  |  | 22,095 |
Pinyon Plain | 9,338 |  |  | 9,338 |
Other | 1,687 |  |  | 1,687 |
Total mineral properties | $ | 284,982 |  |  | $ | 279,400 |
Less: accumulated depletion | (1,607) |  |  | (1,070) |
Mineral properties, net | $ | 283,375 |  |  | $ | 278,330 |
Schedule of Property, Plant and Equipment | The following table is a summary of property, plant and equipment, net:
| Estimated |  |  |  |
| Useful Lives |  | March 31, 2025 |  | December 31, 2024
Land | N/A |  | $ | 1,015 |  |  | $ | 1,015 |
Plant facilities | 12 - 15 years |  | 65,068 |  |  | 63,537 |
Mining equipment(1) | 5 - 10 years |  | 25,408 |  |  | 22,187 |
Light trucks and utility vehicles | 5 years |  | 4,025 |  |  | 4,081 |
Office furniture and equipment | 4 - 7 years |  | 1,936 |  |  | 1,918 |
Construction-in-progress | N/A |  | 1,961 |  |  | 3,187 |
Total property, plant and equipment |  |  | $ | 99,413 |  |  | $ | 95,925 |
Less: accumulated depreciation |  |  | (42,382) |  |  | (40,738) |
Property, plant and equipment, net |  |  | $ | 57,031 |  |  | $ | 55,187 |
(1) Costs incurred for commissioning activities for the Company’s Phase 1 REE separation circuit at the Mill were capitalized. The Company offsets these costs upon sale of separated NdPr that is produced during commissioning of the Phase 1 REE separation circuit. During the three months ended March 31, 2025, the Company offset $0.04 million related to the sale of NdPr.

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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 + Details
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