CAPITAL STOCK AND ADDITIONAL PAID-IN-CAPITAL (Details) - $ / shares	3 Months Ended
	Oct. 31, 2020	Jul. 31, 2020
Stock Option [Member]
Number of Shares	110,000
Exercise Price	$ 1.5
Expiry Date	Mar. 22, 2021
Stock Option [Member]
Number of Shares	75,000
Exercise Price	$ 0.5
Expiry Date	Mar. 17, 2023
Stock Option [Member]
Number of Shares	350,000
Exercise Price	$ 1.2
Expiry Date	Apr. 19, 2023
Stock Option [Member]
Number of Shares	180,000
Exercise Price	$ 1
Expiry Date	Nov. 30, 2023
Stock Option [Member]
Number of Shares	290,000
Exercise Price	$ 0.7
Expiry Date	Aug. 21, 2024
Stock Option [Member]
Number of Shares	2,343,500
Exercise Price	$ 1.11
Expiry Date	Sep. 22, 2025
Stock Option [Member]
Number of Shares	1,338,500	11,676,166
Exercise Price	$ 1.20	$ 1.27
Warrant [Member]
Number of Shares	3,516,100
Exercise Price	$ 1.5
Expiry Date	Apr. 18, 2021
Warrant [Member]
Number of Shares	288,125
Exercise Price	$ 1.2
Expiry Date	Aug. 30, 2021
Warrant [Member]
Number of Shares	200,313
Exercise Price	$ 1.2
Expiry Date	Sep. 17, 2021
Warrant [Member]
Number of Shares	166,666
Exercise Price	$ 1.36
Expiry Date	Sep. 21, 2022
Warrant [Member]
Number of Shares	375,000
Exercise Price	$ 1.3
Expiry Date	Nov. 05, 2020
Warrant [Member]
Number of Shares	933,686
Exercise Price	$ 1.3
Expiry Date	Mar. 01, 2021
Warrant [Member]
Number of Shares	518,407
Exercise Price	$ 1
Expiry Date	Jul. 03, 2022
Warrant [Member]
Number of Shares	2,302,517
Exercise Price	$ 1
Expiry Date	Aug. 19, 2022
Warrant [Member]
Number of Shares	1,150,000
Exercise Price	$ 1
Expiry Date	Sep. 03, 2022
Warrant [Member]
Number of Shares	2,225,352
Exercise Price	$ 1.36
Expiry Date	Jul. 31, 2022