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OTHER INVESTMENTS - Fair value of investments (Details) - At fair value - Rand Refinery Proprietary Limited ("Rand Refinery") - ZAR (R) R in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Disclosure of fair value measurement of assets [line items] |  |
Balance at the beginning of the year | R 166.8 | R 156.3
Fair value adjustment on equity investments at fair value through OCI | 135.2 | 10.5
Balance at the end of the year | R 302.0 | R 166.8

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