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OTHER INVESTMENTS - Sensitivity analysis (Details)
Jun. 30, 2025
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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase (0.20%)
% Change OCI, net of tax, decrease 0.20%
Prestige cash flow 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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase 0.10%
% Change OCI, net of tax, decrease (0.10%)
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 6.90%
Reasonably Possible Percentage Of Decrease Exchange Rate, OCI Net Of Tax, Increase (Decrease) (6.90%)
Commodity prices (gold and silver), increase 1.00%
Reasonably Possible Percentage Of Decrease Commodity Price (1.00%)
Commodity prices (gold and silver) increase, OCI net of tax 6.00%
Reasonably Possible Percentage Of Decrease Commodity Price OCI, Net Of Tax, Increase (Decrease) (6.00%)
Rand Refinery Proprietary Limited ("Rand Refinery") | Operating costs  
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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase (4.70%)
% Change OCI, net of tax, decrease 4.70%
Rand Refinery Proprietary Limited ("Rand Refinery") | Weighted average cost of capital  
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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase (13.30%)
% Change OCI, net of tax, decrease 13.30%
Rand Refinery Proprietary Limited ("Rand Refinery") | Minority discount  
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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase (3.60%)
% Change OCI, net of tax, decrease 3.60%
Rand Refinery Proprietary Limited ("Rand Refinery") | Marketability discount  
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%
Percentage Of Reasonably Possible Decrease In Unobservable Input (1.00%)
% Change OCI, net of tax, increase (3.50%)
% Change OCI, net of tax, decrease 3.50%