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Note 4 - Mineral Rights and Properties - Mineral Rights and Property Acquisition Costs (Details) - USD ($) | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 30, 2020
--- | --- | --- | ---
Mineral Properties | $ 67,711,387 | $ 67,581,387 |
Accumulated Depletion | (3,929,884) | (3,929,884) |
Mineral Properties Excluding Mineral Rights, Net | 63,781,503 | 63,651,503 |
Mineral Properties, Net, Total | 63,784,003 | 63,655,503 | $ 63,655,503
Palangana Mine [Member] |  |  |
Mineral Properties | 6,027,784 | 6,027,784 |
Goliad Project [Member] |  |  |
Mineral Properties | 8,689,127 | 8,689,127 |
Burke Hollow Project [Member] |  |  |
Mineral Properties | 1,495,750 | 1,495,750 |
Longhorn Project [Member] |  |  |
Mineral Properties | 116,870 | 116,870 |
Salvo Project [Member] |  |  |
Mineral Properties | 14,905 | 14,905 |
Anderson Project [Member] |  |  |
Mineral Properties | 3,470,373 | 3,470,373 |
Workman Creek Project [Member] |  |  |
Mineral Properties | 899,854 | 799,854 |
Los Cuatros Project [Member] |  |  |
Mineral Properties | 257,250 | 257,250 |
Slick Rock Project [Member] |  |  |
Mineral Properties | 60,000 | 30,000 |
Reno Creek Project [Member] |  |  |
Mineral Properties | 31,527,870 | 31,527,870 |
Diabase Project [Member] |  |  |
Mineral Properties | 546,938 | 546,938 |
Yuty Project [Member] |  |  |
Mineral Properties | 11,947,144 | 11,947,144 |
Oviedo Project [Member] |  |  |
Mineral Properties | 1,133,412 | 1,133,412 |
Alto Parana Titanium Project [Member] |  |  |
Mineral Properties | 1,433,030 | 1,433,030 |
Other Property Acquisitions [Member] |  |  |
Mineral Properties | 91,080 | 91,080 |
Mineral Rights Databases and Land Use Agreements [Member] |  |  |
Databases and Land Use Agreements | 2,458,808 | 2,458,808 |
Mineral Rights, Databases [Member] |  |  |
Accumulated Amortization | (2,456,308) | (2,454,808) |
Mineral Rights | 2,500 | 4,000 |
Land Use Agreements [Member] |  |  |
Mineral Properties, Net, Total | $ 63,784,003 | $ 63,655,503 |

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