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Acquisition of additional interest in Cigar Lake Joint Venture (CLJV) (Disclosure Of Detailed Information About Business Combinations) (Details)
 12 Months Ended
May 19, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
lb
Dec. 31, 2021
CAD ($)
Disclosure Of Business Combinations [Line Items]      
Reclamation provision   $ (2,528,000)  
Sales contracts   (9,000,000) $ 0
Bargain purchase gain   22,802,000 $ 0
Cigar Lake Joint Venture [Member]      
Disclosure Of Business Combinations [Line Items]      
Property, plant and equipment $ 97,930,000    
Deferred tax asset 28,196,000    
Inventory 9,909,000    
Working capital (24,000)    
Reclamation provision (2,528,000)    
Sales contracts (9,000,000)    
Net assts acquired 124,483,000    
Cash paid 101,681,000    
Bargain purchase gain $ 22,802,000    
Consideration held in escrow   $ 3,000,000  
Additional interest 4.522%    
Uranium production | lb   296,000  
Acquisition costs   $ 1,495,000  
Cigar Lake Joint Venture [Member] | Before acquiring additional interest in Joint Venture [Member]      
Disclosure Of Business Combinations [Line Items]      
Ownership stake 50.025%    
Cigar Lake Joint Venture [Member] | After acquiring additional interest in Joint Venture [Member]      
Disclosure Of Business Combinations [Line Items]      
Ownership stake 54.547%    
Cigar Lake Joint Venture [Member] | Idemitsu [Member]      
Disclosure Of Business Combinations [Line Items]      
Ownership stake 7.875%