CAPITAL STOCK AND ADDITIONAL PAID-IN CAPITAL - Share-based Payment Arrangement, Warrants, Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Apr. 30, 2022	Jul. 31, 2021	Jul. 31, 2020
Number of Warrants
Beginning Balance	6,851,380	12,472,000	8,196,524
Warrants issued	6,017,500	166,666	5,677,869
Warrants expired	(488,438)	(5,787,286)	(1,402,393)
Ending Balance	12,380,442	6,851,380	12,472,000
Weighted Average Exercise Price
Beginning Balance	$ 1.14	$ 1.27	$ 1.57
Warrants issued	0.76	1.36	1
Warrants expired	(1.2)	(1.3)	(2.5)
Ending Balance	$ 0.95	$ 1.14	$ 1.27