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INVESTMENTS IN REHABILITATION OBLIGATION FUNDS - Environmental obligations (Details) - ZAR (R) R in Millions | 12 Months Ended
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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 |

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