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Property, Plant and Equipment - Disclosure of Gold Price, Silver Price and Exchange Rates Assumptions (Details) | Jun. 30, 2019 R / $ | Jun. 30, 2019 R / kg | Jun. 30, 2019 $ / oz | Jun. 30, 2019 K / $ | Jun. 30, 2018 R / $ | Jun. 30, 2018 R / kg | Jun. 30, 2018 $ / oz | Jun. 30, 2018 K / $ | Jun. 30, 2017 R / $ | Jun. 30, 2017 R / kg | Jun. 30, 2017 $ / oz | Jun. 30, 2017 K / $
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Disclosure Of Commodity Prices And Exchange Rate Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange rate (R/USD and PGK/USD) | K / $ |  |  |  | 3.34 |  |  |  | 3.17 |  |  |  | 3.16
Year 1 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Commodity Prices And Exchange Rate Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gold price (in USD per oz and R/kg) |  | 615,000 | 1,325 |  |  | 535,000 | 1,250 |  |  | 525,000 | 1,200 |
Exchange rate (R/USD and PGK/USD) | 14.43 |  |  |  | 13.30 |  |  |  | 13.61 |  |  |
Year 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Commodity Prices And Exchange Rate Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gold price (in USD per oz and R/kg) |  | 600,000 | 1,310 |  |  | 535,000 | 1,250 |  |  | 525,000 | 1,200 |
Exchange rate (R/USD and PGK/USD) | 14.25 |  |  |  | 13.30 |  |  |  | 13.61 |  |  |
Year 1 and year 2 |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Commodity Prices And Exchange Rate Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Silver price (in USD per oz) | $ / oz |  |  | 15.75 |  |  |  | 17.00 |  |  |  | 17.00 |
Long term (year 3 onwards) |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Commodity Prices And Exchange Rate Assumptions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gold price (in USD per oz and R/kg) |  | 585,000 | 1,290 |  |  | 535,000 | 1,250 |  |  | 525,000 | 1,200 |
Silver price (in USD per oz) | $ / oz |  |  | 17.00 |  |  |  | 17.00 |  |  |  | 17.00 |
Exchange rate (R/USD and PGK/USD) | 14.11 |  |  |  | 13.30 |  |  |  | 13.61 |  |  |

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