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INVESTMENTS IN REHABILITATION OBLIGATION FUNDS - Environmental obligations (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Changes in investments in rehabilitation obligation funds movement [abstract]      
Opening balance, in environmental rehabilitation trust funds R 508.9 R 118.0  
FWGR Acquisition, in environmental rehabilitation trust funds 0.0 360.4 R 0.0
Growth, in environmental rehabilitation trust funds 33.3 30.5 7.5
Cash and cash equivalents, in environmental rehabilitation trust funds 542.2 508.9 118.0
Opening balance, for environmental rehabilitation guarantees 78.6 126.0  
Funds received, for environmental rehabilitation guarantees 0.0 (55.2) 0.0
Growth, for environmental rehabilitation guarantees 5.2 7.8 8.8
Closing balance, for environmental rehabilitation guarantees 83.8 78.6 R 126.0
Investments in rehabilitation obligation funds R 626.0 R 587.5