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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
Jun. 30, 2023
Jun. 30, 2022
Disclosure of fair value measurement of assets [line items]    
Balance at the beginning of the year R 136.1 R 119.3
Fair value adjustment on equity investments at fair value through other comprehensive income 20.2 16.8
Balance at the end of the year R 156.3 R 136.1