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Note 4 - Mineral Rights and Properties (Tables)
12 Months Ended
Jul. 31, 2021
Notes Tables  
Schedule Of Mineral Rights and Property Acquisition Costs [Table Text Block]
   
July 31, 2021
   
July 31, 2020
 
Mineral Rights and Properties
 
 
 
 
 
 
 
 
Palangana Mine
 
$
6,027,784
    $
6,027,784
 
Goliad Project
 
 
8,689,127
     
8,689,127
 
Burke Hollow Project
 
 
1,495,750
     
1,495,750
 
Longhorn Project
 
 
116,870
     
116,870
 
Salvo Project
 
 
14,905
     
14,905
 
Anderson Project
 
 
3,470,373
     
3,470,373
 
Workman Creek Project
 
 
899,854
     
799,854
 
Los Cuatros Project
 
 
257,250
     
257,250
 
Slick Rock Project
 
 
60,000
     
30,000
 
Reno Creek Project
 
 
31,527,870
     
31,527,870
 
Diabase Project
 
 
546,938
     
546,938
 
Yuty Project
 
 
11,947,144
     
11,947,144
 
Oviedo Project
 
 
1,133,412
     
1,133,412
 
Alto Paraná Titanium Project
 
 
1,433,030
     
1,433,030
 
Other Property Acquisitions
 
 
91,080
     
91,080
 
   
 
67,711,387
     
67,581,387
 
Accumulated Depletion
 
 
(3,929,884
)
   
(3,929,884
)
   
 
63,781,503
     
63,651,503
 
                 
Databases and Land Use Agreements
 
 
2,458,808
     
2,458,808
 
Accumulated Amortization
 
 
(2,456,308
)
   
(2,454,808
)
   
 
2,500
     
4,000
 
   
$
63,784,003
    $
63,655,503
 
Schedule Of Mineral Property Expenditures Incurred by Major Projects [Table Text Block]
   
Year Ended July 31,
 
   
2021
   
2020
 
Mineral Property Expenditures
 
 
 
 
 
 
 
 
Palangana Mine
 
$
889,597
    $
1,342,927
 
Goliad Project
 
 
237,515
     
190,278
 
Burke Hollow Project
 
 
1,445,797
     
1,130,467
 
Longhorn Project
 
 
9,154
     
17,023
 
Salvo Project
 
 
31,209
     
28,318
 
Anderson Project
 
 
78,601
     
71,170
 
Workman Creek Project
 
 
32,700
     
32,700
 
Slick Rock Project
 
 
52,117
     
52,521
 
Reno Creek Project
 
 
672,225
     
596,551
 
Yuty Project
 
 
31,279
     
65,679
 
Oviedo Project
 
 
371,966
     
350,211
 
Alto Paraná Titanium Project
 
 
198,969
     
230,350
 
Other Mineral Property Expenditures
 
 
427,678
     
474,208
 
   
$
4,478,807
    $
4,582,403