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COMMON STOCK (Details 1) - CAD / shares
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Risk-free interest rate 0.75% 0.75% 1.25%
Expected dividend yield 0.00% 0.00% 0.00%
Expected stock price volatility (historical basis) 92.90% 98.20% 105.60%
Expected option life in years 2 years 1 month 24 days 2 years 1 month 24 days 2 years 1 month 24 days
CAD      
Fair value per option granted during the period (C$) CAD 0.42 CAD 0.30 CAD 0.42