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Note 37 - Group Entities (Tables)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Disclosure of interests in subsidiaries [text block]
   
Functional
currency
  
Country of
incorporation
  
Legal
shareholding
  
Intercompany balances
with holding company
              2020       2019       2020       2019  
Caledonia Holdings Zimbabwe (Private) Limited  
$
  
Zimbabwe
    
100
      
100
      
-
      
-
  
Caledonia Mining Services (Private) Limited  
$
  
Zimbabwe
    
100
      
100
      
-
      
-
  
Fintona Investments Proprietary Limited  
ZAR
  
South Africa
    
100
      
100
      
(14,859
 )    
(14,859
 )
Caledonia Mining South Africa Proprietary Limited  
ZAR
  
South Africa
    
100
      
100
      
612
      
1,750
  
Greenstone Management Services Holdings Limited  
$
  
United Kingdom
    
100
      
100
      
20,818
      
14,902
  
Blanket Mine (1983) (Private) Limited
(2)
  
$
  
Zimbabwe
    
64
      
49
      
(3,980
 )    
(400
 )
Blanket Employee Trust Services (Private) Limited (BETS)
(1)
  
$
  
Zimbabwe
    
-
      
-
      
-
      
-