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Financial risk management and financial instruments - Sensitivity (Details) R in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 ZAR (R) R / $ R / shares $ / shares | Jun. 30, 2022 ZAR (R) R / $ | Jun. 30, 2021 ZAR (R) | Jun. 30, 2023 USD ($) R / $ R / shares $ / shares | Nov. 30, 2022 USD ($) | Nov. 08, 2022 USD ($) R / $ R / shares $ / shares
Disclosure of financial instruments |  |  |  |  |  |
Fair value loss recognised in other operating expenses and income | R (3,287) | R 18,325 | R (2,282) |  |  |
Unsecured debt | US Dollar Convertible Bond, November 2027 |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Contract amount | 14,123 |  |  | $ 750 | $ 750 | $ 750
Commodity and currency derivative assets and liabilities | Rand/USD spot price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | (964) |  |  |  |  |
Oxygen supply contract embedded derivative assets and liabilities |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Balance at the beginning of the year | (339) | (373) |  |  |  |
Amounts settled during the year | 22 | 98 |  |  |  |
Fair value loss recognised in other operating expenses and income | 794 | (64) | (2,058) |  |  |
Balance at the end of the year | R 477 | R (339) | R (373) |  |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand/USD spot price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase in price or rate assumption | R / $ | 1 | 1 |  | 1 |  |
Decrease in price or rate assumption | R / $ | (1) | (1) |  | (1) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R (478) | R (513) |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 478 | R 513 |  |  |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase in significant input variable (as a percent) | 0.10% | 0.10% |  | 0.10% |  |
Decrease in significant input variable (as a percent) | (0.10%) | (0.10%) |  | (0.10%) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R 87 | R 86 |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R (89) | R (87) |  |  |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase in significant input variable (as a percent) | 1.00% | 1.00% |  | 1.00% |  |
Decrease in significant input variable (as a percent) | (1.00%) | (1.00%) |  | (1.00%) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R (734) | R (786) |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | 848 | R 911 |  |  |  |
Convertible bond embedded derivative liability |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Recognition of embedded derivative upon issue of bond | 2,089 |  |  |  |  |
Fair value loss recognised in other operating expenses and income | (867) |  |  |  |  |
Translation of foreign operations | 80 |  |  |  |  |
Balance at the end of the year | R 1,302 |  |  |  |  |
Convertible bond embedded derivative liability | Rand/USD spot price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Significant inputs liabilities | R / $ | 18.83 |  |  | 18.83 |  | 18.23
Convertible bond embedded derivative liability | Conversion price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Significant inputs liabilities | $ / shares | 19.86 |  |  | 19.86 |  | 20.39
Convertible bond embedded derivative liability | Spot share price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Significant inputs liabilities | R / shares | 233.26 |  |  | 233.26 |  | 285.95
Convertible bond embedded derivative liability | Observable bond market price |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Significant inputs liabilities | 0.947 |  |  | 0.947 |  | 1
Convertible bond embedded derivative liability | Credit spread |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase in significant input variable (as a percent) | 1.00% |  |  | 1.00% |  |
Decrease in significant input variable (as a percent) | (1.00%) |  |  | (1.00%) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R (433) |  |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 455 |  |  |  |  |
Significant inputs liabilities | 0.0460 |  |  | 0.0460 |  | 0.0427
Convertible bond embedded derivative liability | Volatility |  |  |  |  |  |
Disclosure of financial instruments |  |  |  |  |  |
Increase in significant input variable (as a percent) | 5.00% |  |  | 5.00% |  |
Decrease in significant input variable (as a percent) | (5.00%) |  |  | (5.00%) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R (377) |  |  |  |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 364 |  |  |  |  |
Significant inputs liabilities | 0.2784 |  |  | 0.2784 |  | 0.2844

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