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Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenues (Note 17) $ 17,710 $ 4,047 $ 38,820 $ 38,192
Costs applicable to revenues 12,784 1,847 34,563 16,580
Exploration, Development, Permitting And Land Holding 12,446 3,619 27,967 8,911
Standby 2,525 1,645 6,172 4,641
Accretion of asset retirement obligations 687 327 2,622 916
Selling, general and administrative (excluding share-based compensation) 12,634 6,033 37,740 17,549
Share-based compensation 3,300 1,027 8,790 3,784
Transactions and integration related costs 0 1,462 0 4,747
Total operating costs and expenses 44,376 15,960 117,854 57,128
Operating loss (26,666) (11,913) (79,034) (18,936)
Depletion, depreciation and amortization     4,001 1,999
Operating Segments | Uranium Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 17,710 4,047 22,999 38,192
Costs applicable to revenues 12,784 1,847 15,443 16,580
Exploration, Development, Permitting And Land Holding 7,406 2,097 17,331 3,054
Standby 2,525 1,645 6,172 4,641
Accretion of asset retirement obligations 364 327 1,066 916
Selling, general and administrative (excluding share-based compensation) 2,591 3,156 9,785 9,251
Share-based compensation 800 545 2,207 2,063
Transactions and integration related costs   0   0
Total operating costs and expenses 26,470 9,617 52,004 36,505
Operating loss (8,760) (5,570) (29,005) 1,687
Depletion, depreciation and amortization 720 610 2,130 1,720
Operating Segments | Heavy Mineral Sands Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 0 0 15,821 0
Costs applicable to revenues 0 0 19,120 0
Exploration, Development, Permitting And Land Holding 4,160 607 8,739 1,537
Standby 0 0 0 0
Accretion of asset retirement obligations 323 0 1,556 0
Selling, general and administrative (excluding share-based compensation) 6,710 915 18,451 2,950
Share-based compensation 1,677 142 4,692 525
Transactions and integration related costs   0   0
Total operating costs and expenses 12,870 1,664 52,558 5,012
Operating loss (12,870) (1,664) (36,737) (5,012)
Depletion, depreciation and amortization 50 60 150 160
Operating Segments | Rare Earth Elements Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 0 0 0 0
Costs applicable to revenues 0 0 0 0
Exploration, Development, Permitting And Land Holding 880 915 1,897 4,320
Standby 0 0 0 0
Accretion of asset retirement obligations 0 0 0 0
Selling, general and administrative (excluding share-based compensation) 3,333 1,962 9,504 5,348
Share-based compensation 823 340 1,891 1,196
Transactions and integration related costs   0   0
Total operating costs and expenses 5,036 3,217 13,292 10,864
Operating loss (5,036) (3,217) (13,292) (10,864)
Depletion, depreciation and amortization $ 620 0 $ 1,720 70
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Revenues (Note 17)   0   0
Costs applicable to revenues   0   0
Exploration, Development, Permitting And Land Holding   0   0
Standby   0   0
Accretion of asset retirement obligations   0   0
Selling, general and administrative (excluding share-based compensation)   0   0
Share-based compensation   0   0
Transactions and integration related costs   1,462   4,747
Total operating costs and expenses   1,462   4,747
Operating loss   $ (1,462)   $ (4,747)