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Note 16 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($)
Jul. 31, 2021
Jul. 31, 2020
Mineral properties $ 1,277,053 $ 1,270,292
Exploration costs 6,546,397 6,384,265
Stock option expense 4,623,357 4,594,159
Depreciable property (1,163,533) (1,157,934)
Inventories (3,607,772) (3,550,814)
Asset retirement obligations 107,499 62,626
Other 80,834 58,559
Section 163(j) interest expense carry forwards 1,061,263 733,343
Loss carry forwards 49,987,843 46,552,687
Deferred Tax Assets, Gross, Total 58,912,941 54,947,183
Valuation allowance (58,912,941) (54,973,300)
Deferred tax assets (26,117)
Deferred tax assets, other comprehensive loss 26,117
Mineral properties (540,992) (545,000)
Net deferred tax liabilities $ (540,992) $ (545,000)