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MINERAL PROPERTIES AND PROPERTY, PLANT AND EQUIPMENT - Schedule of Summary of Mineral Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | $ 279,400 | $ 119,581
Less: accumulated depletion | (1,070) | 0
Mineral properties, net | 278,330 | 119,581
Toliara Project |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 153,510 | 0
Sheep Mountain |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 34,183 | 34,183
Bahia Project |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 32,613 | 29,130
Nichols Ranch ISR Project |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 25,974 | 25,974
Roca Honda |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 22,095 | 22,095
Pinyon Plain |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | 9,338 | 6,512
Other |  |
Property, Plant and Equipment [Line Items] |  |
Total mineral properties | $ 1,687 | $ 1,687

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