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NOTE 8 - WARRANTS (Tables)
9 Months Ended
Jan. 31, 2020
Share-based Payment Arrangement [Abstract]  
Warrant activity
   Warrants  Weighted average exercise price
 Balance outstanding at April 30, 2018 and April 30, 2019     30,654,249   $0.16 
 Expired    (1,614,400)   (0.23)
 Balance outstanding at January 31, 2020    29,039,849   $0.16 
Warrants outstanding
Issue Date  Expiration Date  Warrants  Exercise Price  Remaining life (years)
October 12, 2015  October 12, 2020   4,241,000   $0.20    0.70 
October 12, 2016  October 12, 2021   14,000,000    0.15    1.70 
October 31, 2017  October 31, 2020   10,798,849    0.15    0.75 
       29,039,849   $0.16    1.20