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Note 35 - Group Entities (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of interests in subsidiaries [text block]
    Functional currency   Country of incorporation   Legal shareholding   Intercompany balances with holding company  
            2019   2018   2019     2018  
Subsidiaries of the Company           %   %            
Caledonia Holdings Zimbabwe (Private) Limited  
$
  
Zimbabwe
  
100
  
100
  
-
    
-
  
Caledonia Mining Services 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
    
1,750
      
(565
 )
Greenstone Management Services Holdings Limited  
$
  
United Kingdom
  
100
  
100
    
14,902
      
9,813
  
Blanket Mine (1983) (Private) Limited  
$
  
Zimbabwe
  
(2)
49		  
(2)
49		    
(400
 )    
-
  
Blanket Employee Trust Services (Private) Limited (BETS)
(1)
  
$
  
Zimbabwe
  
-
  
-
    
-
      
-