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Financial risk management and financial instruments - Commodity Price Risk (Details) - $ / bbl | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Maximum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 76.44 | 69.96
Average |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 54.20 | 51.22
Minimum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 36.21 | 13.24

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