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OTHER INVESTMENTS - Narratives (Details) R in Millions | 12 Months Ended
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Jun. 30, 2020 ZAR (R)
Disclosure of financial assets [line items] |
Marketability unobservable inputs rate | 16.50%
Minority discounts unobservable input rate | 17.00%
Rand Refinery Proprietary Limited ("Rand Refinery") [member] |
Disclosure of financial assets [line items] |
Proportion of ownership interest in associate | 11.30%
Investments in equity instruments designated at fair value through other comprehensive income | R 178.4

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