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Acquisition of Barkerville Gold Mines Ltd (Narrative) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CAD ($)
$ / shares
shares
Disclosure of detailed information about business combination [line items]  
Number of share issued | shares 13,560,832
Acquisition of Barkerville $ 162,476
NSR royalty held on the Cariboo project prior to the acquisition of Barkerville 56,070
Share capital [Member]  
Disclosure of detailed information about business combination [line items]  
Acquisition of Barkerville $ 160,564
Barkerville [Member]  
Disclosure of detailed information about business combination [line items]  
Number of shares received by shareholders of acquired company per share of the company | $ / shares $ 0.0357
Acquisition of Barkerville, replacement share options $ 1,900
Number of share issued | shares 13,560,832
Number of replacement share options issued | shares 1,005,478
Number of warrants of Barkerville already held by Osisko and cancelled | shares 10,000,000
Estimated common share warrants cancelled $ 589
Transaction costs 1,513
Cash and cash equivalents acquired $ 8,312
Number of common shares of Barkerville held | shares 183,625,585
Net book value of shares in investment held $ 101,400
Fair value of shares in investment held 77,100
Investment consideration transaction loss $ 24,300
Net smelter return 4.00%
NSR royalty held on the Cariboo project prior to the acquisition of Barkerville $ 56,100
Total purchase price allocated to the assets acquired and the liabilities assumed 241,700
Barkerville [Member] | Share capital [Member]  
Disclosure of detailed information about business combination [line items]  
Acquisition of Barkerville $ 160,600