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Exploration and Evaluation Assets - Schedule of Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year $ 172,824  
Exploration and evaluation expense (30,239) $ (15,212)
Exploration and evaluation assets, end of year 168,684 172,824
Impairment loss (reversal of impairment loss) recognised in profit or loss (245,241) 0
Exploration and evaluation assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Impairment loss (reversal of impairment loss) recognised in profit or loss (22,500)  
Exploration and evaluation assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year 172,824 191,865
Capital expenditures 6,359 3,298
Property acquisitions 301 1,100
Divestitures (498) (166)
Property swaps 385 408
Impairment reversal 22,503 0
Exploration and evaluation expense (30,239) (15,212)
Transfers to oil and gas properties (8,496) (7,727)
Foreign currency translation 5,545 (742)
Exploration and evaluation assets, end of year $ 168,684 $ 172,824