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Related Parties - Narrative (Details) - ZAR (R) R in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Rand Refinery |  |
Disclosure of transactions between related parties [line items] |  |
Ownership interest (as a percent) | 10.38% |
Modise Motloba, Harmony’s deputy chairman |  |
Disclosure of transactions between related parties [line items] |  |
Value of contract per annum (up to) | R 5 |
Value of contract that has been paid | R 4 | R 6
Notice period | 30 days |

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