Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
COSTS AND EXPENSES
Mineral property expenditures	$ 4,487,537	$ 4,552,151	$ 4,120,388
General and administrative	10,142,035	11,407,206	10,241,681
Depreciation, amortization and accretion	347,441	354,624	497,728
Impairment loss on mineral properties			297,942
Inventory write-down			60,694
	14,977,013	16,313,981	15,218,433
LOSS FROM OPERATIONS	(14,977,013)	(16,313,981)	(15,218,433)
OTHER INCOME (EXPENSES)
Interest income	433,031	227,534	137,863
Interest expenses and finance costs	(3,249,881)	(2,952,202)	(2,914,862)
(Loss) income from equity-accounted investment	(1,103,356)	423,657
Other income	134,545	82,543	40,078
Gain (loss) on disposition of assets	1,595,513	(1,696)	(1,055)
Loss on settlement of liabilities			(49,002)
	(2,190,148)	(2,220,164)	(2,786,978)
LOSS BEFORE INCOME TAXES	(17,167,161)	(18,534,145)	(18,005,411)
DEFERRED TAX BENEFITS	14,372	707,511	34,355
NET LOSS FOR THE YEAR	(17,152,789)	(17,826,634)	(17,971,056)
OTHER COMPREHENSIVE INCOME, NET OF INCOME TAXES	12,461	118,343	28
TOTAL COMPREHENSIVE LOSS FOR THE YEAR	$ (17,140,328)	$ (17,708,291)	$ (17,971,028)
NET LOSS PER SHARE, BASIC AND DILUTED (in dollars per share)	$ (0.10)	$ (0.11)	$ (0.14)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED (in shares)	175,844,624	157,123,025	128,244,751