CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
COSTS AND EXPENSES
Mineral property expenditures	$ 4,552,151	$ 4,120,388	$ 4,061,159
General and administrative	11,407,206	10,241,681	9,297,746
Depreciation, amortization and accretion	354,624	497,728	875,724
Impairment loss on mineral properties	0	297,942	97,114
Inventory write-down	0	60,694	0
Total Operating Expenses	16,313,981	15,218,433	14,331,743
LOSS FROM OPERATIONS	(16,313,981)	(15,218,433)	(14,331,743)
OTHER INCOME (EXPENSES)
Interest income	227,534	137,863	24,177
Interest expenses and finance costs	(2,952,202)	(2,914,862)	(3,005,391)
Share of gain from equity-accounted investment	423,657	0	0
Other income	82,543	40,078	0
Loss on disposition of assets	(1,696)	(1,055)	(2,186)
Loss on settlement of liabilities	0	(49,002)	(46,968)
Total Non-Operating Income Expense	(2,220,164)	(2,786,978)	(3,030,368)
LOSS BEFORE INCOME TAXES	(18,534,145)	(18,005,411)	(17,362,111)
DEFERRED TAX BENEFITS	707,511	34,355	32,239
NET LOSS FOR THE YEAR	(17,826,634)	(17,971,056)	(17,329,872)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF INCOME TAXES	118,343	28	(99)
TOTAL COMPREHENSIVE LOSS FOR THE YEAR	$ (17,708,291)	$ (17,971,028)	$ (17,329,971)
NET LOSS PER SHARE, BASIC AND DILUTED	$ (0.11)	$ (0.14)	$ (0.16)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING, BASIC AND DILUTED	157,123,025	128,244,751	106,086,782