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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS - DISAGGREGATION OF REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues (Note 17)	$ 25,108	$ 4,212	$ 60,946	$ 21,110
Revenues	25,108	4,212	60,946	21,110
Uranium Segment | Uranium concentrates
Disaggregation of Revenue [Line Items]
Revenues (Note 17)	24,951	3,850		3,850
Uranium Segment | Alternate Feed Materials, processing and other
Disaggregation of Revenue [Line Items]
Revenues (Note 17)	157	84	275	1,439
Heavy Mineral Sands Segment | Uranium concentrates
Disaggregation of Revenue [Line Items]
Revenues (Note 17)			60,671
Heavy Mineral Sands Segment | Heavy mineral sands
Disaggregation of Revenue [Line Items]
Revenues (Note 17)	$ 0	$ 278	$ 0	$ 15,821

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