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OTHER INVESTMENTS - Key observable/unobservable inputs (Details)
 12 Months Ended
Jun. 30, 2021
yr
R / kg
Jun. 30, 2020
yr
R / kg
Rand Refinery Operation [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Average gold price 847,317 852,098
Average silver price 11,751 9,453
Average South African CPI 0.044 0.048
South African long-term government bond rate 9.50% 9.50%
Terminal growth rate [member] | Rand Refinery Operation [member]    
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 0.044 0.050
Weighted average cost of capital [member] | Rand Refinery Operation [member]    
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 0.151 0.151
Discount period [member] | Investment in Prestige Bullion [member]    
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 | yr 12 13
Cost of equity [member] | Investment in Prestige Bullion [member]    
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 0.165 0.132