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OTHER INVESTMENTS - Key observable/unobservable inputs (Details)
12 Months Ended
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 852,098
Average silver price 9,453
Average South African CPI 0.048
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, entity's own equity instruments 0.05
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, entity's own equity instruments 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, entity's own equity instruments | yr 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, entity's own equity instruments 0.132