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Share capital (Narrative) (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
share
shares
Dec. 31, 2022
CAD ($)
$ / shares
Rate
shares
Dec. 31, 2022
USD ($)
$ / shares
Rate
shares
Disclosure of classes of share capital [line items]      
Proceeds from issuing shares $ 0 $ 311,962  
Income taxes on share issue costs   $ 3,700  
NCIB description In December 2023, Osisko renewed its normal course issuer bid ("NCIB") program. Under the terms of the NCIB program, Osisko may acquire up to 9,258,298 of its common shares from time to time in accordance with the normal course issuer bid procedures of the TSX. Under the terms of the previous NCIB program, Osisko was allowed to acquire up to 18,293,240 of its common shares from time to time, from December 12, 2022 to December 11, 2023. Under the terms of the previous NCIB program, Osisko was allowed to acquire up to 18,293,240 of its common shares from time to time, from December 12, 2022 to December 11, 2023.
Daily purchases of common shares, limit | shares 94,834 81,963 81,963
Normal course issuer bid purchase of common shares (shares) | shares   1,694,658 1,694,658
Normal course issuer bid purchase of common shares   $ 22,135  
Average acquisition price per share | $ / shares   $ 13.06  
Accordion feature $ 200,000    
Share capital [Member]      
Disclosure of classes of share capital [line items]      
Number of shares issued | share 185,346,524    
Normal course issuer bid purchase of common shares   $ 18,911  
Bought deal private placement [Member]      
Disclosure of classes of share capital [line items]      
Number of common shares issued on a bought deal basis | shares   18,600,000 18,600,000
Price per share issued | $ / shares     $ 13.45
Proceeds from issuing shares   $ 312,000 $ 250.2
Share issue expenses   13,900  
Share issue expenses net   10,200  
Income taxes on share issue costs   $ 3,700  
Underwriters commission | Rate   4.00% 4.00%
Dividend reinvestment plan [Member]      
Disclosure of classes of share capital [line items]      
Common shares elected to participate in dividend reinvestment plan | shares 12.7    
Dividends payable $ 800    
Common shares issued under DRIP | shares 140,405 118,639 118,639
Discount under dividend reinvestment plan 3.00% 3.00% 3.00%
Dividend reinvestment plan [Member] | January 15, 2024 [Member]      
Disclosure of classes of share capital [line items]      
Common shares issued under DRIP | shares 42,011    
Discount under dividend reinvestment plan 3.00%