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Note 4 - Property, Plant and Equipment (Tables)
 3 Months Ended
Oct. 31, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
October 31, 2019
    
July 31, 2019
  
   
Cost
   
Accumulated
Depreciation
   
Net Book
Value
   
Cost
    
Accumulated
Depreciation
    
Net Book
Value
  
Hobson Processing Facility
  
$
6,642,835
    
$
(773,933
)
  
$
5,868,902
     $
6,642,835
     $
(773,933
 )   $
5,868,902
  
Mining Equipment
  
 
2,472,297
    
 
(2,407,572
)
  
 
64,725
      
2,467,557
      
(2,402,681
 )    
64,876
  
Logging Equipment and Vehicles
  
 
1,970,124
    
 
(1,743,359
)
  
 
226,765
      
1,950,229
      
(1,730,905
 )    
219,324
  
Computer Equipment
  
 
574,743
    
 
(550,632
)
  
 
24,111
      
572,551
      
(546,652
 )    
25,899
  
Furniture and Fixtures
  
 
170,701
    
 
(169,522
)
  
 
1,179
      
170,701
      
(169,379
 )    
1,322
  
Land and Buildings
  
 
889,606
    
 
(31,288
)
  
 
858,318
      
889,606
      
(27,570
 )    
862,036
  
   
$
12,720,306
    
$
(5,676,306
)
  
$
7,044,000
     $
12,693,479
     $
(5,651,120
 )   $
7,042,359