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Mineral Property Interests (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Mineral Property Interests [Line Items]    
Balance, beginning of the year $ 145,190 $ 160,693
Sale of Homestake Resources   (16,460)
Acquisition of additional ownership interest in ESJV   1,281
Option payment received (880) (310)
Dispositions (1,746)  
Change in estimate of provision for site reclamation and closure 75 (14)
Balance, end of the year 142,639 145,190
Quebec [Member]    
Disclosure Of Mineral Property Interests [Line Items]    
Balance, beginning of the year 125,656 125,094
Sale of Homestake Resources   0
Acquisition of additional ownership interest in ESJV   1,281
Option payment received (880) (310)
Dispositions (1,746)  
Change in estimate of provision for site reclamation and closure (52) (409)
Balance, end of the year 122,978 125,656
Nunavut [Member]    
Disclosure Of Mineral Property Interests [Line Items]    
Balance, beginning of the year 19,534 19,139
Sale of Homestake Resources   0
Acquisition of additional ownership interest in ESJV   0
Option payment received 0 0
Dispositions 0  
Change in estimate of provision for site reclamation and closure 127 395
Balance, end of the year 19,661 19,534
British Columbia [Member]    
Disclosure Of Mineral Property Interests [Line Items]    
Balance, beginning of the year 0 16,460
Sale of Homestake Resources   (16,460)
Acquisition of additional ownership interest in ESJV   0
Option payment received 0 0
Dispositions 0  
Change in estimate of provision for site reclamation and closure 0 0
Balance, end of the year $ 0 $ 0