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Finance Expense (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Finance Expense
4.
  
FINANCE EXPENSE
  
   
  
   
  
   
 
  
Interest expense - environmental rehabilitation
  
 
(11.7
) 
  
 
(11.7
) 
  
 
(12.1
) 
 
  
Unwinding of discount rate on silicosis settlement costs
  
 
(1.3
) 
  
 
(2.0
) 
  
 
(0.9
) 
 
  
Interest expense - lease liabilities (2018: finance lease liabilities)
  
 
(18.6
) 
  
 
(0.2
) 
  
 
—  
 
 
  
Interest expense - borrowings
  
 
(114.0
) 
  
 
(91.6
) 
  
 
(91.2
) 
 
  
Borrowing costs capitalised
3
  
 
43.4
 
  
 
17.5
 
  
 
22.9
 
 
  
Total finance expense
  
 
(102.2
) 
  
 
(88.0
) 
  
 
(81.3
) 
3
 
 
Borrowing costs capitalised of US$43.4 million comprise borrowing costs relating to general borrowings of US$31.0 million and specific borrowings of US$12.4 million. The specific borrowings of US$12.4 million relate to the Gruyere project and are included in additions to property, plant and equipment of US$612.5 million (refer note 13).