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OTHER INVESTMENTS - Investments in other entities (Details) - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Investments in other entities | R 168.6 | R 151.4 |
Fair value adjustment on equity instruments at fair value through OCI | 17.2 | (15.7) | R (28.2)
Dividends received on equity instruments at fair value through OCI | (78.3) | (71.5) | R (76.1)
Listed investments (Fair value hierarchy Level 1) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Investments in other entities | 7.2 | 10.7 |
Unlisted investments (Fair value hierarchy Level 3) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Investments in other entities | 161.4 | 140.7 |
West Wits Mining Limited ("WWM") |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Fair value adjustment on equity instruments at fair value through OCI | R (3.5) | (32.8) |
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Shares held in other entities (in shares) | 47,812,500 |  |
Investments in other entities | R 7.2 | 10.7 |
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1) | Top of range |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Percentage of interest held | 2.40% |  |
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1) | Bottom of range |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Percentage of interest held | 2.10% |  |
Rand Refinery Proprietary Limited ("Rand Refinery") |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Dividends received on equity instruments at fair value through OCI | R (77.4) | (70.1) |
Rand Refinery Proprietary Limited ("Rand Refinery") | At fair value |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Fair value adjustment on equity instruments at fair value through OCI | R 20.2 | 16.8 |
Rand Refinery Proprietary Limited ("Rand Refinery") | Unlisted investments (Fair value hierarchy Level 3) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Shares held in other entities (in shares) | 44,438 |  |
Percentage of interest held | 11.30% |  |
Investments in other entities | R 156.3 | 136.1 |
Rand Mutual Assurance Company Limited |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Fair value adjustment on equity instruments at fair value through OCI | 0.5 | 0.3 |
Dividends received on equity instruments at fair value through OCI | R (0.9) | (1.4) |
Rand Mutual Assurance Company Limited | Unlisted investments (Fair value hierarchy Level 3) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Shares held in other entities (in shares) | 12,659 |  |
Percentage of interest held | 1.30% |  |
Investments in other entities | R 4.9 | 4.4 |
Guardrisk Insurance Company Limited (Cell Captive A170) | Unlisted investments (Fair value hierarchy Level 3) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Shares held in other entities (in shares) | 20 |  |
Percentage of interest held | 100.00% |  |
Investments in other entities | R 0.1 | 0.1 |
Chamber of Mines Building Company Proprietary Limited | Unlisted investments (Fair value hierarchy Level 3) |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Shares held in other entities (in shares) | 42,292 |  |
Percentage of interest held | 4.50% |  |
Investments in other entities | R 0.1 | R 0.1 |

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