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Financial risk management and financial instruments - Derivatives Entered (Details) R in Millions, $ in Millions | 12 Months Ended |  |
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Jun. 30, 2019 ZAR (R) MT MMBbls | Jun. 30, 2018 USD ($) MT $ / T $ / gal $ / bbl R / $ MMBbls | Jun. 30, 2018 ZAR (R) MT MMBbls | Jun. 30, 2019 USD ($) $ / gal R / $ MMBbls | Jun. 30, 2019 ZAR (R) $ / gal R / $ MMBbls | Jun. 30, 2018 ZAR (R) MT $ / T $ / gal $ / bbl R / $ MMBbls
Crude oil options |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Premium paid | $ |  | $ 207 |  |  |  |
Number of barrels | MMBbls | 48 | 98 | 98 |  |  |
Number of barrels - open positions | MMBbls |  | 48 |  |  |  | 48
Number of barrels - settled | MMBbls | 48 | 50 | 50 |  |  |
Average Brent crude oil price floor, net of costs (in USD per barrel) | $ / bbl |  | 53.36 |  |  |  | 53.36
Realised (losses)/gains recognised in the income statement | R (1,857) |  | R (1,605) |  |  |
Unrealised (losses)/gains recognised in the income statement | 1,359 |  | (1,698) |  |  |
Amount included in the statement of financial position |  |  |  |  |  | R 482
Zero-cost collar |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Contract/Notional amount | $ |  | $ 4,000 |  | $ 4,000 |  |
Annual average floor (in Rand per USD) | R / $ |  | 13.14 |  | 13.84 | 13.84 | 13.14
Annual average cap (in Rand per USD) | R / $ |  | 15.14 |  | 16.63 | 16.63 | 15.14
Realised (losses)/gains recognised in the income statement | (610) |  | 2,772 |  |  |
Unrealised (losses)/gains recognised in the income statement | R 933 |  | R (1,836) |  |  |
Amount included in the statement of financial position |  |  |  |  | R 579 | R (338)
Coal swaps |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Number of tons hedged | MT | 1.40 | 4.20 | 4.20 |  |  |
Number of tons - open positions | MT |  | 1.40 |  |  |  | 1.40
Number of tons - settled | MT | 1.40 | 2.80 | 2.80 |  |  |
Average swap price | $ / T |  | 81.82 |  |  |  | 81.82
Realised (losses)/gains recognised in the income statement | R (337) |  | R (618) |  |  |
Unrealised (losses)/gains recognised in the income statement | R 428 |  | R (406) |  |  |
Amount included in the statement of financial position |  |  |  |  |  | R (414)
Ethane swaps |  |  |  |  |  |
Financial risk management and financial instruments |  |  |  |  |  |
Number of barrels | MMBbls | 16.00 | 5.80 | 5.80 |  |  |
Number of barrels - open positions | MMBbls |  | 3.50 |  | 12.50 | 12.50 | 3.50
Number of barrels - settled | MMBbls | 3.50 | 2.30 | 2.30 |  |  |
Average swap price | $ / gal |  | 0.27 |  | 0.28 | 0.28 | 0.27
Realised (losses)/gains recognised in the income statement | R 29 |  | R (1) |  |  |
Unrealised (losses)/gains recognised in the income statement | R (491) |  | R 30 |  |  |
Amount included in the statement of financial position |  |  |  |  | R (454) | R 33

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