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Financial risk management and financial instruments - Commodity Price Risk (Details) - $ / bbl | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Maximum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 89.1 | 97.92
Average |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 74.59 | 84.74
Minimum |  |
Financial risk management and financial instruments |  |
Dated Brent Crude price | 61.09 | 73.56

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