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WARRANT LIABILITIES (Tables)
12 Months Ended
Apr. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Fair Value of Derivative Liabilities
  $
   
Balance, April 30, 2018 95,570
   
Bonus warrants issuable pursuant to promissory notes (Note 5) 1,602
Change in fair value of warrant derivatives (97,172)
   
Balance, April 30, 2019 -