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Share capital (Narrative) (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
share
$ / shares
Rate
shares
Dec. 31, 2022
USD ($)
$ / shares
Rate
shares
Dec. 31, 2021
CAD ($)
$ / shares
shares
Disclosure of classes of share capital [line items]      
Proceeds from issuing shares $ 311,962   $ 0
Income taxes on share issue costs 3,700    
Exercise of share options and shares issued under the share purchase plan $ 4,387   $ 14,544
NCIB description In December 2022, Osisko renewed its normal course issuer bid ("NCIB") program. Under the terms of the 2022 NCIB program, Osisko may acquire up to 18,293,240 of its common shares from time to time in accordance with the normal course issuer bid procedures of the TSX. In December 2022, Osisko renewed its normal course issuer bid ("NCIB") program. Under the terms of the 2022 NCIB program, Osisko may acquire up to 18,293,240 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 2021 NCIB program, Osisko was allowed to acquire up to 16,530,688 of its common shares from time to time, from December 12, 2021 to December 11, 2022.
Daily purchases of common shares, limit | shares 81,963 81,963 87,264
Average daily trading volume | shares 327,853 327,853 349,057
Normal course issuer bid purchase of common shares (shares) | shares 1,694,658 1,694,658 2,103,366
Normal course issuer bid purchase of common shares $ 22,135   $ 30,791
Average acquisition price per share | $ / shares $ 13.06   $ 14.64
Accordion feature $ 200,000   $ 100,000
Share capital [Member]      
Disclosure of classes of share capital [line items]      
Number of shares issued | share 184,037,728    
Normal course issuer bid purchase of common shares $ 18,911   $ 22,471
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 6.7 6.7  
Dividends payable $ 400    
Common shares issued under DRIP | shares 118,639 118,639 120,523
Discount under dividend reinvestment plan 3.00% 3.00% 3.00%
Dividend reinvestment plan [Member] | January 16, 2023 [Member]      
Disclosure of classes of share capital [line items]      
Common shares issued under DRIP | shares 22,012 22,012  
Discount under dividend reinvestment plan 3.00% 3.00%