OTHER INVESTMENTS - Sensitivity analysis (Details)	Jun. 30, 2022
Rand Refinery Operation [member]
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%)
Commodity prices (gold and silver), increase	1.00%
Commodity prices (gold and silver), decrease	(1.00%)
Rand US Dollar exchange rate in OCI net of tax, increase	3.30%
Rand US Dollar exchange rate in OCI net of tax, decrease	(3.30%)
Commodity prices (gold and silver) increase, OCI net of tax	2.80%
Commodity prices (gold and silver) decrease , OCI net of tax	(2.80%)
Operating costs [member] \| Rand Refinery Operation [member]
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	(2.60%)
% Change OCI, net of tax, decrease	2.60%
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]
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%
Minority discount [member] \| Rand Refinery Operation [member]
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 [member] \| Rand Refinery Operation [member]
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 [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]
Increase in unobservable input	1.00%
Decrease in unobservable input,	(1.00%)
% Change OCI, net of tax, increase	(1.00%)
% Change OCI, net of tax, decrease	1.00%
Prestige Bullion dividend forecast [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]
Increase in unobservable input	1.00%
Decrease in unobservable input,	(1.00%)
% Change OCI, net of tax, increase	0.30%
% Change OCI, net of tax, decrease	(0.30%)

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Percentage of reasonably possible decrease in unobservable input, Oci net of tax.

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Percentage of reasonably possible increase in unobservable input, Oci net of tax.

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Reasonably possible percentage of the decrease commodity price, OCI net of tax.

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Reasonably possible percentage of the decrease exchange rate.

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Reasonably possible percentage of the decrease exchange rate, OCI net of tax.

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Reasonably possible percentage of the increase commodity price OCI, net of tax

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Reasonably possible percentage of the increase in exchange rate.

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Reasonably possible percentage of the increase exchange rate, OCI net of tax.

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Reasonably possible percentage of the decrease commodity price

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Reasonably possible percentage of the increase in commodity price.

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