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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