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Segment report - Mining Segment (Details)
R in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
ZAR (R)
item
MT
R / T
Dec. 31, 2019
ZAR (R)
Jun. 30, 2021
item
MT
R / T
Jun. 30, 2020
ZAR (R)
Disclosure of operating segments        
EBIT | R R 21,650 R 9,853   R (111,030)
Mining        
Disclosure of operating segments        
Increase (decrease) in productivity (as a percent) 2.00%      
Productivity rate (in tons per continuous miner per shift) | item 1,162      
Increase (decrease) in export sales (as a percent) 8.00%      
Increase (decrease) in EBIT (as a percent) 26.00%      
EBIT | R R 1,732 R 1,374   R 2,756
Increase (decrease) in normalised unit cost (as a percent) 2.00%      
Normalised unit cost | R / T 351      
Mining | Minimum        
Disclosure of operating segments        
Targeted stockpile levels | MT 1.5      
Mining | Maximum        
Disclosure of operating segments        
Targeted stockpile levels | MT 2.0      
Mining | Forecast        
Disclosure of operating segments        
Sales volume | MT     3.2  
Mining | Forecast | Minimum        
Disclosure of operating segments        
Productivity rate (in tons per continuous miner per shift) | item     1,160  
Normalised unit cost | R / T     340  
Mining | Forecast | Maximum        
Disclosure of operating segments        
Productivity rate (in tons per continuous miner per shift) | item     1,210  
Normalised unit cost | R / T     360