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Note 15 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Jul. 31, 2019
Jul. 31, 2018
Mineral properties $ 1,256,327 $ 1,587,220
Exploration costs 6,551,403 6,556,355
Stock option expense 4,570,905 4,266,067
Depreciable property (937,614) (255,544)
Inventories (3,343,361) (3,894,552)
Asset retirement obligations 20,561  
Asset retirement obligations   (28,925)
Other 35,983 57,060
Section 163(j) interest expense carry forwards 384,109
Loss carry forward 43,198,434 42,075,593
51,736,747 50,363,274
Valuation allowance (51,739,873) (50,366,411)
Deferred tax assets (3,126) (3,137)
Deferred tax assets, other comprehensive loss 3,126 3,137
Mineral properties (550,551) (564,923)
Net deferred tax liabilities $ (550,551) $ (564,923)