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Financial risk management and financial instruments - Commodity Price Risk (Details) - $ / bbl | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Maximum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 137.64 | 76.44
Average |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 92.06 | 54.20
Minimum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 66.17 | 36.21

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