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Warrants (Tables)
12 Months Ended
Dec. 31, 2019
Warrants [Abstract]  
Disclosure of detailed information about warrants, activity [Table Text Block]
      2019     2018  
                  Weighted                 Weighted  
                  average                 average  
      Number of           exercise     Number of           exercise  
      Warrants(i),(ii)     Amount     price     Warrants(i),(ii)     Amount     price  
            $     $           $     $  
Balance - January 1   11,195,500     30,901     27.61     11,195,500     30,901     27.61  
  Expired (i)   (5,715,500 )   (12,829 )   19.08     -     -     -  
Balance - December 31   5,480,000     18,072     36.50     11,195,500     30,901     27.61  

(i) 5,715,500 warrants entitling the holder to purchase one common share of Osisko at a price of $19.08 expired unexercised on February 26, 2019.

(ii) 5,480,000 warrants entitling the holder to purchase one common share of Osisko at a price of $36.50 until March 5, 2022.