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OTHER INVESTMENTS - Key observable/unobservable inputs (Details) - R / kg
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
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]    
Forecast average gold price 1,060,562 880,207
Forecast average silver price 13,460 11,209
Average South African CPI 4.50% 4.40%
South African long-term government bond rate 10.51% 10.26%
Terminal growth rate | 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]    
Significant unobservable input, investments in other entities, percentage 0.045 0.044
Weighted average cost of capital | 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]    
Significant unobservable input, investments in other entities, percentage 0.170 0.159
Discount period | Investment in Prestige Bullion    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Significant unobservable input, investments in other entities, years 10 years 11 years
Cost of equity | Investment in Prestige Bullion    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Significant unobservable input, investments in other entities, percentage 0.170 0.142