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PROVISION FOR ENVIRONMENTAL REHABILITATION - Narrative (Details) - ZAR (R)
R in Millions
Jun. 30, 2021
Jun. 30, 2020
Provision for environmental rehabilitation [abstract]    
Discount Rate, maximum 9.00% 9.50%
Discount Rate, minimum 8.90% 8.10%
Inflation rate used in calculation of net present value of rehabilitation liability 5.20% 5.10%
Undiscounted rehabilitation cost R 742.2 R 752.5