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Note 4 - Mineral Rights and Properties (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2016
Annual Property Maintenance Fees | $ 3,400,000 |  |
Palangana Mine [Member] |  |  |
Mining Lease and Surface Use Agreements Realted to Royalty, Term (Year) | 5 years |  |
Depletion, Total | $ 0 | $ 0 |
Goliad Project [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 5 years |  |
Burke Hollow Project [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 5 years |  |
Longhorn Project [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 5 years |  |
Salvo Project [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 5 years |  |
Anderson Project [Member] |  |  |
Interest on Mineral Properties | 100.00% |  |
Workman Creek Project [Member] |  |  |
Interest on Mineral Properties | 100.00% |  |
Net Smelter Royalty, Percent | 3.00% |  |
Annual Advance Royalty Payment | $ 100,000 |  | $ 50,000
Right and Option to Acquire Net Smelter Royalty, Percent |  | 1.50% |
Right and Option to Acquire Royalty, Amount | $ 1,000,000 |  |
Additional Right and Option to Acquire Net Smelter Royalty Held by Certain Individuals, Percent | 0.50% |  |
Amount of Royalty Interest Acquired | $ 333,340 |  |
Payments for Advance Royalties | $ 100,000 | $ 100,000 |
Los Cuatros Project [Member] |  |  |
Interest on Mineral Properties | 100.00% |  |
Slick Rock Project [Member] |  |  |
Interest on Mineral Properties | 100.00% |  |
Payments for Advance Royalties | $ 30,000 | $ 30,000 |
Slick Rock Project [Member] | Minimum [Member] |  |  |
Net Smelter Royalty, Percent | 1.00% |  |
Slick Rock Project [Member] | Maximum [Member] |  |  |
Net Smelter Royalty, Percent | 3.00% |  |
Reno Creek Project [Member] | Minimum [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 5 years |  |
Reno Creek Project [Member] | Maximum [Member] |  |  |
Mineral Leases and Surface Use Agreements, Term (Year) | 20 years |  |
Diabase Project [Member] |  |  |
Interest on Mineral Properties | 100.00% |  |
Yuty Project [Member] |  |  |
Overriding Royalty Per Pound | 0.21 |  |
Oviedo Project [Member] |  |  |
Percentage of Gross Overriding Royalty | 1.50% |  |
Percentage of Gross Overriding Royalty, Exclusive Right and Option | 0.50% |  |
Overriding Royalty, Exclusive Right and Option to Acquire | $ 166,667 |  |
Percentage of Gross Overriding Royalty, Remaining | 1.00% |  |
Alto Parana Titanium Project [Member] |  |  |
Royalties Percentage | 1.50% |  |
Percentage of Net Smelter Royalty, Right to Acquire | 0.50% |  |
Payments to Acquire Smelter Royalty | $ 500,000 |  |

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