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REVENUE BY GEOGRAPHIC LOCATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from External Customers by Geographic Areas [Line Items]      
Revenues $ 78,114 $ 37,928 $ 12,515
Revenue from Contract with Customer, Excluding Assessed Tax 78,114 37,928 12,515
Uranium | Customer 1      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 15,026 10,472 0
Uranium | Customer 3      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 8,590 0 0
Uranium | Customer 4      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 18,470 0
Uranium | Customer 5      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 4,335 0
Uranium | Customer 6      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 470
Uranium | Customer 7      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 866 8,778
Uranium | Customer 8      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 445
Heavy Mineral Sands | Customer 2      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 10,896 0 0
Rare Earth Elements | Customer 6      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 2,848 2,122
UNITED STATES | Uranium      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 24,333 34,514 9,473
UNITED STATES | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 270 0 0
CHINA | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 17,303 0 0
JAPAN | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 12,409 0 0
NETHERLANDS | Uranium      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 5,275 0 0
NETHERLANDS | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 6,481 0 0
GERMANY | Uranium      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 8,590 0 0
SPAIN | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,245 0 0
KOREA, REPUBLIC OF | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 1,169 0 0
MEXICO | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 806 0 0
KENYA | Heavy Mineral Sands      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 191 0 0
ESTONIA | Uranium      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 470
ESTONIA | Rare Earth Elements      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 0 2,848 2,122
CANADA | Uranium      
Revenue from External Customers by Geographic Areas [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 42 $ 566 $ 450