OTHER INVESTMENTS - Sensitivity analysis (Details)	Jun. 30, 2020
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	2.10%
Rand US Dollar exchange rate in OCI net of tax, decrease	(2.20%)
Commodity prices (gold and silver) increase, OCI net of tax	1.70%
Commodity prices (gold and silver) decrease , OCI net of tax	1.80%
Volumes [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	2.00%
% Change OCI, net of tax, decrease	(2.00%)
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	(1.70%)
% Change OCI, net of tax, decrease	2.00%
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	(1.30%)
% Change OCI, net of tax, decrease	1.40%
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	0.40%
% Change OCI, net of tax, decrease	(0.40%)

Percentage of reasonably possible decrease in unobservable input.

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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.

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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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