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REPORTABLE SEGMENTS - Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]        
Revenues (Note 17) $ 25,108 $ 4,212 $ 60,946 $ 21,110
Costs applicable to revenues 10,690 3,655 32,165 21,779
Exploration, development and processing (excluding share-based compensation) 8,115 9,075 16,209 15,521
Standby 2,872 1,780 6,208 3,647
Accretion of asset retirement obligations 3,711 862 4,308 1,935
Selling, general and administrative 15,922 12,130 29,292 25,106
Share-based compensation 3,641 2,885 7,152 5,490
Transaction and integration related costs 10,732 0 13,115 0
Total operating costs and expenses 55,683 30,387 108,449 73,478
Operating loss (30,575) (26,175) (47,503) (52,368)
Depletion, depreciation and amortization     3,095 2,611
Operating Segments | Uranium Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 25,108 3,934 60,946 5,289
Costs applicable to revenues 10,690 2,659 32,165 2,659
Exploration, development and processing (excluding share-based compensation) 6,238 4,729 12,528 9,925
Standby 2,872 1,780 6,208 3,647
Accretion of asset retirement obligations 391 356 771 702
Selling, general and administrative 3,487 2,534 6,202 7,193
Share-based compensation 1,159 520 2,354 1,408
Transaction and integration related costs 0   0  
Total operating costs and expenses 24,837 12,578 60,228 25,534
Operating loss 271 (8,644) 718 (20,245)
Depletion, depreciation and amortization 790 790 1,550 1,410
Operating Segments | Heavy Mineral Sands Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 0 278 0 15,821
Costs applicable to revenues 0 996 0 19,120
Exploration, development and processing (excluding share-based compensation) 1,333 3,329 2,597 4,579
Standby 0 0 0 0
Accretion of asset retirement obligations 3,320 506 3,537 1,233
Selling, general and administrative 7,698 6,535 14,399 11,741
Share-based compensation 1,225 1,801 2,166 3,015
Transaction and integration related costs 0   0  
Total operating costs and expenses 13,576 13,167 22,699 39,688
Operating loss (13,576) (12,889) (22,699) (23,867)
Depletion, depreciation and amortization 110 50 190 100
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 and processing (excluding share-based compensation) 544 1,017 1,084 1,017
Standby 0 0 0 0
Accretion of asset retirement obligations 0 0 0 0
Selling, general and administrative 4,737 3,061 8,691 6,172
Share-based compensation 1,257 564 2,632 1,067
Transaction and integration related costs 0   0  
Total operating costs and expenses 6,538 4,642 12,407 8,256
Operating loss (6,538) (4,642) (12,407) (8,256)
Depletion, depreciation and amortization 770 $ 590 1,360 $ 1,100
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Revenues (Note 17) 0   0  
Costs applicable to revenues 0   0  
Exploration, development and processing (excluding share-based compensation) 0   0  
Standby 0   0  
Accretion of asset retirement obligations 0   0  
Selling, general and administrative 0   0  
Share-based compensation 0   0  
Transaction and integration related costs 10,732   13,115  
Total operating costs and expenses 10,732   13,115  
Operating loss $ (10,732)   $ (13,115)