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Provision for Reclamation Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Provision for Reclamation Liabilities (Details) [Line Items]    
Estimated discounted cash flows of future reclamation costs $ 10.8 $ 8.4
Undiscounted future cash outflows $ 11.5 $ 8.6
Nominal discount rate 4.07% 0.90%
Reclamation disbursements $ 4.5 $ 3.3
Rehabilitation expenses 6.6 5.4
Deposit with financial institution pledged as security 7.9 3.0
Reclamation Liabilities [Member]    
Provision for Reclamation Liabilities (Details) [Line Items]    
Deposit with financial institution pledged as security 20.6 $ 15.2
KSM [Member]    
Provision for Reclamation Liabilities (Details) [Line Items]    
Deposit with financial institution pledged as security $ 5.4