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Mining interests and plant and equipment - Disclosure of plant and equipment movements by category (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Acquisition of Tintic by Osisko Development $ 182,229 $ 0
Additions 50,986 190,100
Depreciation (12,935) (7,814)
Transfers 0 0
Disposals and others (6,191) (213)
Land and buildings [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 24,332  
Acquisition of Tintic by Osisko Development 6,940  
Additions 1,418  
Depreciation (2,387)  
Transfers (133)  
Disposals and others (964)  
Currency translation adjustments 550  
Deconsolidation of Osisko Development (22,885)  
Closing balance 6,871 24,332
Land and buildings [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance 10,877  
Land and buildings [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance (4,006)  
Machinery and equipment [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 43,121  
Acquisition of Tintic by Osisko Development 4,420  
Additions 9,592  
Depreciation (8,163)  
Transfers 5,526  
Disposals and others (3,668)  
Currency translation adjustments 2,060  
Deconsolidation of Osisko Development (52,812)  
Closing balance 76 43,121
Machinery and equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance 1,012  
Machinery and equipment [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance (936)  
Construction-in-progress [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 24,249  
Acquisition of Tintic by Osisko Development 1,694  
Additions 3,222  
Depreciation 0  
Transfers (5,393)  
Disposals and others 0  
Currency translation adjustments 774  
Deconsolidation of Osisko Development (24,546)  
Closing balance 0 24,249
Construction-in-progress [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance 0  
Construction-in-progress [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Closing balance 0  
Total Plant and equipment [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 91,702 30,209
Acquisition of Tintic by Osisko Development 13,054 0
Additions 14,232 58,192
Depreciation (10,550) (7,814)
Transfers 0 11,221
Disposals and others (4,632) (213)
Currency translation adjustments 3,384  
Deconsolidation of Osisko Development (100,243)  
Closing balance 6,947 91,702
Total Plant and equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance 105,112  
Closing balance 11,889 105,112
Total Plant and equipment [Member] | Accumulated depreciation [Member]    
Disclosure of detailed information about property, plant and equipment and Mining interests [line items]    
Beginning balance (13,410)  
Closing balance $ (4,942) $ (13,410)