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Cash Generated by Operations | 12 Months Ended
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Dec. 31, 2020
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Cash Generated by Operations |
28. |  | CASH GENERATED BY OPERATIONS |  |  |  |  |  |  |  |  |  |  |  |
|  | Profit/(loss) f or the year |  |  | 745.4 |  |  |  | 174.7 |  |  |  | (344.8 | )
|  | Mining and income taxation |  |  | 432.5 |  |  |  | 175.6 |  |  |  | (65.9 | )
|  | Royalties |  |  | 105.0 |  |  |  | 73.7 |  |  |  | 62.5 |
|  | Interest expense |  |  | 127.7 |  |  |  | 132.6 |  |  |  | 91.8 |
|  | Interest received |  |  | (7.6 | ) |  |  | (6.6 | ) |  |  | (6.8 | )
|  | Amortisation and depreciation |  |  | 661.3 |  |  |  | 610.0 |  |  |  | 668.4 |
|  | Interest expense - environmental rehabilitation |  |  | 10.7 |  |  |  | 11.7 |  |  |  | 11.7 |
|  | Non-cash rehabilitation expense/(income) |  |  | 1.5 |  |  |  | 13.4 |  |  |  | (0.9 | )
|  | Interest received - environmental trust funds |  |  | (0.7 | ) |  |  | (0.7 | ) |  |  | (0.6 | )
|  | Impairment, net of reversal of impairment of investments and assets |  |  | (50.6 | ) |  |  | 9.8 |  |  |  | 520.3 |
|  | Write-off of exploration and evaluation assets |  |  | 16.9 |  |  |  | 30.0 |  |  |  | 37.7 |
|  | (Profit)/loss on disposal of assets |  |  | 0.2 |  |  |  | (1.2 | ) |  |  | 51.6 |
|  | Gain on acquisition of Asanko |  |  | — |  |  |  | — |  |  |  | (51.8 | )
|  | Unrealised (gain)/loss and prior year mark-to-market reversals on derivative contracts |  |  | (176.4 | ) |  |  | 112.6 |  |  |  | 36.6 |
|  | Fair value gain on Maverix warrants |  |  | (1.3 | ) |  |  | (4.2 | ) |  |  | (3.8 | )
|  | Profit on disposal of Maverix |  |  | — |  |  |  | (14.6 | ) |  |  | (4.0 | )
|  | Silicosis settlement costs |  |  | 0.3 |  |  |  | (1.6 | ) |  |  | (4.5 | )
|  | Share-based payments |  |  | 14.5 |  |  |  | 20.5 |  |  |  | 37.5 |
|  | Long-term incentive plan expense |  |  | 51.3 |  |  |  | 9.1 |  |  |  | 1.1 |
|  | Payment of long-term incentive plan |  |  | — |  |  |  | — |  |  |  | (17.8 | )
|  | Borrowing costs capitalised |  |  | (13.2 | ) |  |  | (43.4 | ) |  |  | (17.5 | )
|  | Share of results of equity-accounted investees, net of taxation |  |  | 1.0 |  |  |  | (4.5 | ) |  |  | 0.2 |
|  | Tarkwa expected credit loss |  |  | 29.0 |  |  |  | — |  |  |  | — |
|  | Other |  |  | (13.6 | ) |  |  | 5.9 |  |  |  | (3.0 | )
|  | Total cash generated by operations |  |  | 1,933.9 |  |  |  | 1,302.8 |  |  |  | 998.0 |
1 | Refer note 13 for further details.
2 | Derivative financial liabilities of US$127.6 million at 31 December 2019 were previously disclosed as part of the trade and other payables balance.
3 | Relates to the Australian (US$2.6 million) and Ghanaian (US$4.7 million) oil derivative contracts which are for the period January 2022 to December 2022.

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