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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT (Tables) | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Schedule of Summary of Mineral Properties | The following table is a summary of mineral properties:
| September 30, 2025 |  | December 31, 2024
Toliara Project | $ | 180,109 |  |  | $ | 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 | $ | 305,999 |  |  | $ | 279,400 |
Less: accumulated depletion | (3,703) |  |  | (1,070) |
Mineral properties, net | $ | 302,296 |  |  | $ | 278,330 |
Schedule of Property, Plant and Equipment | The following table is a summary of property, plant and equipment, net:
| Estimated |  |  |  |
| Useful Lives |  | September 30, 2025 |  | December 31, 2024
Land | N/A |  | $ | 1,015 |  |  | $ | 1,015 |
Plant facilities(1) | 12 - 15 years |  | 65,538 |  |  | 63,537 |
Mining equipment | 5 - 10 years |  | 29,884 |  |  | 22,187 |
Light trucks and utility vehicles | 5 years |  | 4,468 |  |  | 4,081 |
Office furniture and equipment | 4 - 7 years |  | 1,965 |  |  | 1,918 |
Construction-in-progress | N/A |  | 5,259 |  |  | 3,187 |
Total property, plant and equipment |  |  | $ | 108,129 |  |  | $ | 95,925 |
Less: accumulated depreciation |  |  | (46,037) |  |  | (40,738) |
Property, plant and equipment, net |  |  | $ | 62,092 |  |  | $ | 55,187 |
(1) The Company capitalized the costs incurred for commissioning activities related to its Phase 1 REE separation circuit at the Mill, which was placed into service on October 1, 2024. Upon the sale of separated NdPr produced during commissioning, the Company offsets the costs capitalized during commissioning activities. During the nine months ended September 30, 2025, the Company offset the Phase 1 REE separation circuit against sales of NdPr of $0.04 million, related to the sale of NdPr. There were no sales of NdPr during the three months ended September 30, 2025.

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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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