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Conversion from IFRS to US GAAP - Summary of Conversion (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Operations                
Net loss $ (19,080) $ (18,115) $ (23,904) $ (6,894) $ (67,993) $ (25,611) $ (23,155)  
Revenue 13,362 9,258 5,320 30,394 58,334 22,148 4,245  
Cost of goods sold 13,650 10,600 10,428 30,863 65,541 19,573 2,656  
Mineral property expenditures 12,522 3,112 10,233 3,896 29,763 14,224 10,054  
General and administrative 4,871 9,973 5,953 6,259 27,056 19,914 12,378  
Depreciation, amortization and accretion 958 792 783 836 3,369 5,696 736  
Gain on sale of mineral properties         0 11,837 1,852  
Provision for income taxes 0 0 0 (5,929) (5,929) (467) (165)  
Balance Sheet                
Inventory 20,967 27,408 26,756 10,784 20,967 9    
Mineral rights and properties, net 271,922 273,961 274,490 274,490 271,922 274,490 154,765  
Right of use assets - operating lease 310 378 423 403 310 459    
Total assets 392,722 398,184 408,123 422,500 392,722 326,567    
Deferred tax liability 26,980       26,980 27,959    
Total liabilities 74,180 65,675 62,525 62,300 74,180 64,601    
Common stock 380,325 377,753 375,070 367,518 380,325 308,198    
Additional paid-in-capital 59,856 58,417 50,954 50,087 59,856 41,203    
Accumulated deficit (150,848) (134,321) (118,191) (95,892) (150,848) (89,456)    
Total equity 318,542 332,509 345,598 360,200 318,542 261,966 195,577 $ 137,573
Nonrelated party                
Balance Sheet                
Accounts payable and accrued liabilities 7,464 $ 5,579 $ 3,157 $ 3,520 7,464 3,582    
IFRS                
Statement of Operations                
Net loss         (58,787) (20,175) (16,615)  
Balance Sheet                
Inventory 21,315       21,315      
Mineral rights and properties, net 286,587       286,587 272,511    
Right of use assets - operating lease 293       293 444    
Total assets 407,718       407,718 324,573    
Deferred tax liability 0       0 0    
Total liabilities 47,157       47,157 36,639    
Common stock 397,622       397,622 333,122    
Additional paid-in-capital 52,431       52,431 19,308    
Accumulated deficit (118,702)       (118,702) (66,516)    
Total equity 360,560       360,560 287,935    
IFRS | Nonrelated party                
Balance Sheet                
Accounts payable and accrued liabilities 7,421       7,421 3,579    
Adjustments                
Statement of Operations                
Revenue         0 22,148 4,245  
Cost of goods sold         2,584 (19,573) (2,656)  
Mineral property expenditures         (19,576) (11,075) (9,897)  
General and administrative         1,666 1,721 1,322  
Depreciation, amortization and accretion         191 167 89  
Impairment of mineral properties         0 1,538 0  
Gain on sale of uranium         0 (2,575) (35)  
Gain on sale of mineral properties         0 1,746 227  
Provision for income taxes         5,929 467 $ 165  
Balance Sheet                
Inventory (348)       (348)      
Mineral rights and properties, net (14,665)       (14,665) 1,979    
Right of use assets - operating lease 17       17 15    
Total assets (14,996)       (14,996) 1,994    
Deferred tax liability 26,980       26,980 27,959    
Total liabilities 27,023       27,023 27,962    
Common stock (17,297)       (17,297) (24,924)    
Additional paid-in-capital 7,425       7,425 21,895    
Accumulated deficit (32,146)       (32,146) (22,940)    
Total equity (42,018)       (42,018) (25,969)    
Adjustments | Nonrelated party                
Balance Sheet                
Accounts payable and accrued liabilities $ 43       $ 43 $ 3