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Deconsolidation of Osisko Development and discontinued operations - Disclosure of results of operations presented as discontinued operations on the consolidated statements of loss (Details) - CAD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Results of discontinued operations:    
Net loss from discontinued operations $ 0 $ (268,475)
Osisko Development, discontinued operations [Member]    
Results from discontinued operations:    
Net loss on deconsolidation   (140,910)
Results of discontinued operations:    
Revenues   44,820
Impairment of mining assets   (81,000)
Other expenses, net   (89,895)
Net loss before income taxes   (126,075)
Deferred income tax (expense) recovery   (1,490)
Net loss   (127,565)
Net loss from discontinued operations   $ (268,475)
Net loss per share from discontinued operations    
Basic   $ (1.5)
Diluted   $ (1.5)