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Exploration and evaluation - Disclosure of detailed information about exploration assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statements Line Items    
Beginning balance $ 3,635 $ 42,519
Acquisition of Tintic by Osisko Development 38,508 0
Additions 4,519 3,784
Impairment 0 (42,668)
Other adjustments (417) 0
Currency translation adjustments 3,138 0
Deconsolidation of Osisko Development (49,383) 0
Ending balance 0 3,635
Cost [Member]    
Statements Line Items    
Beginning balance 104,492  
Ending balance 0 104,492
Accumulated depreciation [Member]    
Statements Line Items    
Beginning balance (100,857)  
Ending balance $ 0 $ (100,857)