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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, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Changes in investments in rehabilitation obligation funds movement [abstract] |  |  |
Opening balance, in environmental rehabilitation trust funds | R 542.2 | R 508.9 |
FWGR Acquisition, in environmental rehabilitation trust funds | 0.0 | 0.0 |
Growth, in environmental rehabalitation trust funds | 22.5 | 33.3 | R 30.5
Cash and cash equivalents, in environmental rehabilitation trust funds | 564.7 | 542.2 | 508.9
Opening balance, for environmental rehabilitation guarantees | 83.8 | 78.6 |
Growth, for environmental rehabilitation guarantees | 3.7 | 5.2 | 7.9
Closing balance, for environmental rehabilitation guarantees | 87.5 | 83.8 | R 78.6
Investments in rehabilitation obligation funds | R 652.2 | R 626.0 |

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