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OTHER INVESTMENTS - Sensitivity analysis (Details)
Jun. 30, 2024
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]  
Rand US Dollar exchange rate, increase 1.00%
Rand US Dollar exchange rate, decrease (1.00%)
Rand US Dollar exchange rate in OCI net of tax, increase 3.20%
Rand US Dollar exchange rate in OCI net of tax, decrease 3.20%
Commodity prices (gold and silver), increase 1.00%
Commodity prices (gold and silver), decrease (1.00%)
Commodity prices (gold and silver) increase, OCI net of tax 2.50%
Commodity prices (gold and silver) decrease, OCI net of tax 2.50%
Operating costs | 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]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase (2.90%)
% Change OCI, net of tax, decrease 2.90%
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]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase (3.70%)
% Change OCI, net of tax, decrease 3.70%
Minority discount | 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]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase (1.20%)
% Change OCI, net of tax, decrease 1.20%
Marketability discount | 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]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase (1.20%)
% Change OCI, net of tax, decrease 1.20%
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]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase (0.40%)
% Change OCI, net of tax, decrease 0.40%
Prestige Bullion dividend forecast | Investment in Prestige Bullion  
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]  
Increase in unobservable input 1.00%
Decrease in unobservable input (1.00%)
% Change OCI, net of tax, increase 0.10%
% Change OCI, net of tax, decrease (0.10%)