CAPITAL STOCK AND ADDITIONAL PAID-IN-CAPITAL (Details)	3 Months Ended
	Oct. 31, 2019 $ / shares shares
Stock Option [Member]
Number of Shares | shares	110,000
Exercise Price | $ / shares	$ 1.50
Expiry Date	Mar. 22, 2021
Stock Option [Member]
Number of Shares | shares	58,660
Exercise Price | $ / shares	$ 2.00
Expiry Date	Aug. 08, 2021
Stock Option [Member]
Number of Shares | shares	214,254
Exercise Price | $ / shares	$ 2.40
Expiry Date	Dec. 27, 2021
Stock Option [Member]
Number of Shares | shares	90,000
Exercise Price | $ / shares	$ 2.80
Expiry Date	Apr. 20, 2020
Stock Option [Member]
Number of Shares | shares	613,100
Exercise Price | $ / shares	$ 1.20
Expiry Date	Apr. 19, 2023
Stock Option [Member]
Number of Shares | shares	280,000
Exercise Price | $ / shares	$ 1.00
Expiry Date	Nov. 29, 2023
Stock Option [Member]
Number of Shares | shares	751,284
Exercise Price | $ / shares	$ 0.70
Expiry Date	Aug. 21, 2024
Stock Option [Member]
Number of Shares | shares	2,117,298
Exercise Price | $ / shares	$ 1.22
Warrant [Member]
Number of Shares | shares	678,886
Exercise Price | $ / shares	$ 2.50
Expiry Date	Dec. 27, 2019
Warrant [Member]
Number of Shares | shares	13,333
Exercise Price | $ / shares	$ 2.50
Expiry Date	Jan. 03, 2020
Warrant [Member]
Number of Shares | shares	2,100
Exercise Price | $ / shares	$ 1.50
Expiry Date	Apr. 18, 2020
Warrant [Member]
Number of Shares | shares	3,516,100
Exercise Price | $ / shares	$ 1.50
Expiry Date	Apr. 18, 2021
Warrant [Member]
Number of Shares | shares	288,125
Exercise Price | $ / shares	$ 1.20
Expiry Date	Aug. 30, 2021
Warrant [Member]
Number of Shares | shares	200,313
Exercise Price | $ / shares	$ 1.20
Expiry Date	Sep. 17, 2021
Warrant [Member]
Number of Shares | shares	962,500
Exercise Price | $ / shares	$ 1.30
Expiry Date	Oct. 16, 2020
Warrant [Member]
Number of Shares | shares	375,000
Exercise Price | $ / shares	$ 1.30
Expiry Date	Nov. 05, 2020
Warrant [Member]
Number of Shares | shares	933,686
Exercise Price | $ / shares	$ 1.30
Expiry Date	Mar. 01, 2021
Warrant [Member]
Number of Shares | shares	518,407
Exercise Price | $ / shares	$ 1.00
Expiry Date	Jul. 03, 2022
Warrant [Member]
Number of Shares | shares	2,302,518
Exercise Price | $ / shares	$ 1.00
Expiry Date	Aug. 19, 2022
Warrant [Member]
Number of Shares | shares	1,150,000
Exercise Price | $ / shares	$ 1.00
Expiry Date	Sep. 03, 2022
Warrant [Member]
Number of Shares | shares	10,940,968
Exercise Price | $ / shares	$ 1.30