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Financial risk management and financial instruments - Derivatives Entered (Details) $ in Thousands, € in Millions | 12 Months Ended |  |
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Jun. 30, 2025 USD ($) R / $ $ / bbl $ / € MMBbls | Jun. 30, 2024 USD ($) $ / bbl $ / € R / $ MMBbls | Jun. 30, 2025 EUR (€) R / $ $ / bbl $ / € MMBbls | Jun. 30, 2024 EUR (€) $ / bbl $ / € R / $ MMBbls
Crude oil put options purchased |  |  |  |
Financial risk management and financial instruments |  |  |  |
Number of barrels - open positions | MMBbls | 22.5 | 16.8 | 22.5 | 16.8
Number of barrels - settled | MMBbls | 16.8 | 18 | 16.8 | 18
Annual average price | $ / bbl | 59.8 | 58.7 | 59.8 | 58.7
Premium paid | $ 114,090 | $ 94,800 |  |
Forward exchange contracts | US Dollar |  |  |  |
Financial risk management and financial instruments |  |  |  |
Contract/Notional amount - open positions | $ 907,000 | $ 1,080,000 |  |
Annual average price | R / $ | 18.51 | 18.9 | 18.51 | 18.9
Forward exchange contracts | Euro |  |  |  |
Financial risk management and financial instruments |  |  |  |
Contract/Notional amount - open positions | € |  |  | € 54 | € 43
Annual average price | $ / € | 1.11 | 1.08 | 1.11 | 1.08
Foreign exchange zero cost collars |  |  |  |
Financial risk management and financial instruments |  |  |  |
Contract/Notional amount - open positions | $ 1,720,000 | $ 1,530,000 |  |
Contract/Notional amount - settled | $ 1,652,000 | $ 2,760,000 |  |
Annual average floor price | R / $ | 17.6 | 17.53 | 17.6 | 17.53
Annual average cap price | R / $ | 21.13 | 22.65 | 21.13 | 22.65

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