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Share capital - Disclosure of detailed information about warrants, activity (Details)
12 Months Ended
Dec. 31, 2019
CAD ($)
Share
Dec. 31, 2018
CAD ($)
Share
Number of warrants    
Warrants outstanding, beginning | Share 23,876,800 25,454,600
Warrants issued | Share 0 516,800
Warrants exercised | Share (11,970,000) (1,525,000)
Warrants expired | Share (36,800) (569,600)
Warrants outstanding, ending | Share 11,870,000 23,876,800
Average exercise price    
Warrants outstanding, beginning | $ $ 0.20 $ 0.18
Warrants issued | $ 0 0.70
Warrants exercised | $ 0.10 0.08
Warrants expired | $ 0.70 0.46
Warrants outstanding, ending | $ $ 0.29 $ 0.20