TAX REFORM AND INCOME TAXES (Details 3) - USD ($)	Jul. 31, 2018	Jul. 31, 2017
Deferred tax assets (liabilities)
Mineral properties	$ 1,587,220	$ 2,533,819
Exploration costs	6,556,355	10,950,241
Stock option expense	4,266,067	7,031,732
Depreciable property	(255,544)	(367,164)
Inventories	(3,894,552)	(5,471,486)
Asset retirement obligations	(28,925)	(130,740)
Other	57,060	179,518
Loss carry forward	42,075,593	57,989,069
Deferred Tax Assets, Gross	50,363,274	72,714,989
Valuation allowance	(50,366,411)	(72,720,198)
Deferred tax assets	(3,137)	(5,209)
Deferred tax assets, other comprehensive loss	3,137	5,209
Deferred tax liabilities
Mineral properties	(564,923)	(609,470)
Net deferred tax liabilities	$ (564,923)	$ (609,470)