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Cost of Sales (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Cost of Sale
2.
  
COST OF SALES
  
   
  
   
  
   
 
  
Salaries and wages
  
 
(334.8
) 
  
 
(392.8
) 
  
 
(414.7
) 
 
  
Consumable stores
  
 
(270.4
) 
  
 
(280.0
) 
  
 
(346.7
) 
 
  
Utilities
  
 
(131.5
) 
  
 
(148.3
) 
  
 
(150.1
) 
 
  
Mine contractors
  
 
(511.0
) 
  
 
(365.3
) 
  
 
(307.4
) 
 
  
Other
  
 
(218.8
) 
  
 
(204.4
) 
  
 
(207.6
) 
 
  
Cost of sales before gold inventory change and amortisation and depreciation
  
 
(1,466.5
) 
  
 
(1,390.8
) 
  
 
(1,426.5
) 
 
  
Gold inventory change
  
 
43.0
 
  
 
16.2
 
  
 
69.5
 
 
  
Cost of sales before amortisation and depreciation
  
 
(1,423.5
) 
  
 
(1,374.6
) 
  
 
(1,357.0
) 
 
  
Amortisation and depreciation
  
 
(610.0
) 
  
 
(668.4
) 
  
 
(748.1
) 
 
  
Total cost of sales
  
 
(2,033.5
) 
  
 
(2,043.0
) 
  
 
(2,105.1
)