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Spin-out transaction of the mining activities (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 CAD ($) share shares $ / shares
Barolo Ventures Corp [Member] | RTO Financing [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Transaction costs related to the RTO transaction | $ |  | $ 1.3
Osisko Development Corp [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Ownership interest | 75.10% | 84.10%
Osisko Development Corp [Member] | Cariboo gold project And Bonanza Ledge II gold project [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Net smelter return |  | 5.00%
Osisko Development Corp [Member] | San Antonio gold project [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Percentage of gold and silver stream |  | 15.00%
Osisko Development Corp [Member] | James Bay and Guerrero exploration properties [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Net smelter return |  | 3.00%
Osisko Development Corp [Member] | RTO Financing [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Number of shares issued | shares |  | 13,350,000
Subscription price per share | $ / shares |  | $ 7.50
Proceeds from issuing other equity instruments | $ |  | $ 100.1
Number of instrument converted into common shares | shares |  | 13,350,000
Number of instrument converted into common shares purchase warrants | shares |  | 6,675,000
Exercise price of warrants granted | $ / shares |  | $ 10
Transaction costs related to the RTO transaction including underwriters commission | $ |  | $ 3.0
Number of shares of subsidiary held | shares |  | 100,000,100
Ownership interest |  | 88.00%
Osisko Development Corp [Member] | Brokered private placement [Member] |  |
Disclosure of Spin-out transaction of the mining activities [Line Items] |  |
Number of shares issued | share |  | 5,367,050
Subscription price per share | $ / shares |  | $ 7.50
Proceeds from issuing other equity instruments | $ |  | $ 40.2
Exercise price of warrants granted | $ / shares |  | $ 10.00
Number of shares of subsidiary held | shares |  | 100,000,100
Ownership interest |  | 84.10%
Transaction costs related to brokered private placement including underwriters commission | $ |  | $ 2.1

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