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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Text block [abstract] |
Summary of Carrying Amounts and Fair Values of Financial Assets and Financial Liabilities | The following tables show the carrying amounts and fair values of financial assets and financial liabilities.
|  | United States Dollar |
|  | Carrying amount |  |  | Carrying Amount |  |  | Fair value |
Figures in millions unless otherwise stated |  | Fair value through profit or loss |  |  | Fair value through OCI |  |  | Financal assets measured at amortised cost |  |  | Other financial liabilities measured at amortised cost |  |  | Total |  |  | Total |
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets measured at fair value |
- Environmental trust funds |  |  | 7.4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7.4 |  |  |  | 7.4 |
- Trade receivables from provisional copper sales |  |  | 23.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 23.7 |  |  |  | 23.7 |
- Investments |  |  | — |  |  |  | 42.4 |  |  |  | — |  |  |  | — |  |  |  | 42.4 |  |  |  | 42.4 |
- Asanko redeemable preference shares |  |  | — |  |  |  | 92.6 |  |  |  | — |  |  |  | — |  |  |  | 92.6 |  |  |  | 92.6 |
- Warrants |  |  | 12.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 12.9 |  |  |  | 12.9 |
- Gold and foreign currency derivatives contracts |  |  | 113.3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 113.3 |  |  |  | 113.3 |
Total |  |  | 157.3 |  |  |  | 135.0 |  |  |  | — |  |  |  | — |  |  |  | 292.3 |  |  |  | 292.3 |
Financial assets not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Environmental trust funds |  |  | — |  |  |  | — |  |  |  | 71.9 |  |  |  | — |  |  |  | 71.9 |  |  |  | 71.9 |
- Loan advanced - contractor |  |  | — |  |  |  | — |  |  |  | 68.4 |  |  |  | — |  |  |  | 68.4 |  |  |  | 68.4 |
- Trade and other receivables |  |  | — |  |  |  | — |  |  |  | 29.5 |  |  |  | — |  |  |  | 29.5 |  |  |  | 29.5 |
- Cash and cash equivalents |  |  | — |  |  |  | — |  |  |  | 886.8 |  |  |  | — |  |  |  | 886.8 |  |  |  | 886.8 |
Total |  |  | — |  |  |  | — |  |  |  | 1,056.6 |  |  |  | — |  |  |  | 1,056.6 |  |  |  | 1,056.6 |
Financial liabilities measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Copper and oil derivative contracts |  |  | 29.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 29.1 |  |  |  | 29.1 |
Total |  |  | 29.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 29.1 |  |  |  | 29.1 |
Financial liabilities not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Borrowings |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,526.9 |  |  |  | 1,526.9 |  |  |  | 1,689.8 |
- Trade and other payables |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 452.0 |  |  |  | 452.0 |  |  |  | 452.0 |
- Lease liabilities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 429.0 |  |  |  | 429.0 |  |  |  | 429.0 |
Total |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,407.9 |  |  |  | 2,407.9 |  |  |  | 2,570.8 |
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial assets measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Environmental trust funds |  |  | 7.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7.2 |  |  |  | 7.2 |
- Trade receivables from provisional copper sales |  |  | 22.8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22.8 |  |  |  | 22.8 |
- Investments |  |  | — |  |  |  | 47.9 |  |  |  | — |  |  |  | — |  |  |  | 47.9 |  |  |  | 47.9 |
- Asanko redeemable preference shares |  |  | — |  |  |  | 95.5 |  |  |  | — |  |  |  | — |  |  |  | 95.5 |  |  |  | 95.5 |
- Warrants |  |  | 11.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11.7 |  |  |  | 11.7 |
- Oil derivatives contracts |  |  | 1.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1.1 |  |  |  | 1.1 |
Total |  |  | 42.8 |  |  |  | 143.4 |  |  |  | — |  |  |  | — |  |  |  | 186.2 |  |  |  | 186.2 |
Financial assets not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Environmental trust funds |  |  | — |  |  |  | — |  |  |  | 62.3 |  |  |  | — |  |  |  | 62.3 |  |  |  | 62.3 |
- Trade and other receivables |  |  | — |  |  |  | — |  |  |  | 51.4 |  |  |  | — |  |  |  | 51.4 |  |  |  | 51.4 |
- Cash and cash equivalents |  |  | — |  |  |  | — |  |  |  | 515.0 |  |  |  | — |  |  |  | 515.0 |  |  |  | 515.0 |
Total |  |  | — |  |  |  | — |  |  |  | 628.7 |  |  |  | — |  |  |  | 628.7 |  |  |  | 628.7 |
Financial liabilities measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Gold and foreign exchange derivative contracts |  |  | 127.6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 127.6 |  |  |  | 127.6 |
Total |  |  | 127.6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 127.6 |  |  |  | 127.6 |
Financial liabilities not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Borrowings |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,845.8 |  |  |  | 1,845.8 |  |  |  | 1,952.4 |
- Trade and other payables |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 385.3 |  |  |  | 385.3 |  |  |  | 385.3 |
- Lease liabilities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 332.9 |  |  |  | 332.9 |  |  |  | 332.9 |
Total |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,564.0 |  |  |  | 2,564.0 |  |  |  | 2,670.6 |
Summary of Assets and Liabilities Measured at Fair Value by Level within Fair Value Hierarchy | The following table sets out the Group’s financial assets and financial liabilities by level within the fair value hierarchy at the reporting date:
|  | United States Dollar |
|  | 2020 |  |  | 2019 |
Figures in millions unless otherwise stated |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Financial assets measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental trust funds |  |  | 7.4 |  |  |  | — |  |  |  | 7.4 |  |  |  | — |  |  |  | 7.2 |  |  |  | — |  |  |  | 7.2 |  |  |  | — |
Trade receivables from provisional copper sales |  |  | 23.7 |  |  |  | — |  |  |  | 23.7 |  |  |  | — |  |  |  | 22.8 |  |  |  | — |  |  |  | 22.8 |  |  |  | — |
Investments - listed |  |  | 42.4 |  |  |  | 42.4 |  |  |  | — |  |  |  | — |  |  |  | 47.9 |  |  |  | 47.9 |  |  |  | — |  |  |  | — |
Asanko redeemable preference shares |  |  | 92.6 |  |  |  | — |  |  |  | — |  |  |  | 92.6 |  |  |  | 95.5 |  |  |  | — |  |  |  | — |  |  |  | 95.5 |
Warrants |  |  | 12.9 |  |  |  | — |  |  |  | 12.9 |  |  |  | — |  |  |  | 11.7 |  |  |  | — |  |  |  | 11.7 |  |  |  | — |
Gold derivative contracts |  |  | 27.3 |  |  |  | — |  |  |  | 27.3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign currency derivative contracts |  |  | 86.0 |  |  |  | — |  |  |  | 86.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Oil derivative contracts |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1.1 |  |  |  | — |  |  |  | 1.1 |  |  |  | — |
Financial assets not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental trust funds |  |  | 71.9 |  |  |  | — |  |  |  | 71.9 |  |  |  | — |  |  |  | 62.3 |  |  |  | — |  |  |  | 62.3 |  |  |  | — |
Loan advanced - contractor |  |  | 68.4 |  |  |  |  |  |  |  | — |  |  |  | 68.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial liabilities measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Copper derivative contracts |  |  | 14.0 |  |  |  | — |  |  |  | 14.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Oil derivative contracts |  |  | 15.1 |  |  |  | — |  |  |  | 15.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Gold derivative contracts |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 127.3 |  |  |  | — |  |  |  | 127.3 |  |  |  | — |
Foreign currency derivative contracts |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |  |  |  | — |
Financial liabilities not measured at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  | 1,689.8 |  |  |  | 1,156.3 |  |  |  | — |  |  |  | 533.5 |  |  |  | 1,952.4 |  |  |  | 1,700.4 |  |  |  | — |  |  |  | 252.0 |

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