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Royalty, stream and other interests (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Rate
Dec. 31, 2022
USD ($)
Rate
Dec. 31, 2021
CAD ($)
Royalties
Dec. 31, 2021
USD ($)
Royalties
Royalty, Stream And Other Interests [Line Items]        
Number of royalties acquired | Royalties     6 6
Investments in royalty, payment     $ 32.6 $ 26,000,000
Long term gold price per ounce       $ 700
Marimaca Copper Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 1.00% 1.00%    
Investments in royalty, payment $ 20.3 $ 15,500,000    
Cascabel Copper Gold Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 0.60% 0.60%    
Investments in royalty, payment $ 67.2 $ 50,000,000    
Minimum annual royalty payments   $ 4,000,000    
CSA Silver Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 100.00% 100.00%    
Description of revised binding agreement Under the revised CSA Silver Stream agreement, the upfront cash payment payable by Osisko Bermuda to MAC has been reduced from US$90.0 million to US$75.0 million (the "Silver Deposit"). In the event the silver price averages at least US$25.50 per ounce over the ten business days immediately prior to the closing of the transaction, the Silver Deposit will be increased by US$15.0 million to a total of US$90.0 million. Under the revised CSA Silver Stream agreement, the upfront cash payment payable by Osisko Bermuda to MAC has been reduced from US$90.0 million to US$75.0 million (the "Silver Deposit"). In the event the silver price averages at least US$25.50 per ounce over the ten business days immediately prior to the closing of the transaction, the Silver Deposit will be increased by US$15.0 million to a total of US$90.0 million.    
Investments in royalty, payment   $ 90,000,000    
Equity of Metals Acquisition Corp   15,000,000    
Potential Backstop Copper Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Payment of up-front cash deposit   75,000,000    
Equity of Metals Acquisition Corp   $ 25,000,000    
Potential Backstop Copper Stream [Member] | First Threshold Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 3.00% 3.00%    
Potential Backstop Copper Stream [Member] | Second Threshold Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired | Rate 4.875% 4.875%    
Potential Backstop Copper Stream [Member] | Remaining life of mine [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 2.25% 2.25%    
Cariboo Property [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 5.00% 5.00%    
San Antonio Property [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 15.00% 15.00%    
Description of cash payments on-going per-ounce cash payments equal to 15% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal on-going per-ounce cash payments equal to 15% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal    
Tintic Property [Member]        
Royalty, Stream And Other Interests [Line Items]        
Description of cash payments on-going per-ounce cash payments equal to 25% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal on-going per-ounce cash payments equal to 25% of the applicable spot metal price on the business day immediately preceding the date of delivery of such refined metal    
Tintic Property [Member] | First Threshold Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 2.50% 2.50%    
Tintic Property [Member] | Second Threshold Stream [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired 2.00% 2.00%    
Spring Valley Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     0.50% 0.50%
Number of royalties acquired | Royalties     4 4
Spring Valley Project [Member] | Minimum [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     2.50% 2.50%
Spring Valley Project [Member] | Maximum [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     3.00% 3.00%
Moonlight Exploration Property [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     1.00% 1.00%
Almaden Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     0.50% 0.50%
Gold and silver offtake right acquired     30.00% 30.00%
Sailfish Royalty Corp.[Member] | Tocantinzinho Gold Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Investments in royalty, payment     $ 12.6 $ 10,000,000
Royalty interest after buy-down payment option     0.75% 0.75%
Falco Resources Ltd. [Member]        
Royalty, Stream And Other Interests [Line Items]        
Additional investments in royalty, stream and other interests     $ 10.0  
Amount of second installment payment     $ 20.0  
Barrick TZ Limited [Member] | AfriOre and Gold Rim [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     2.00% 2.00%
Investments in royalty, payment       $ 11,800,000
Barrick TZ Limited [Member] | Frontier Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     1.00% 1.00%
Barrick TZ Limited [Member] | Central Hounde Project [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of NSR acquired     1.00% 1.00%
GoGold Resources Inc [Member]        
Royalty, Stream And Other Interests [Line Items]        
Percentage of gold and silver from tailings piles     2.40% 2.40%
Percentage of transfer price of gold and silver spot prices     30.00% 30.00%