| US$'000 | 2018 | 2017 |
| Finance income | ||
| Bank interest income | (3,511) | (3,651) |
| Other interest income | (2) | - |
| Total finance income | (3,513) | (3,651) |
| Finance costs | ||
| Interest on Borrowings | ||
| Secured bank loans | 26,343 | 26,375 |
| Unsecured convertible bonds | 6,534 | 6,400 |
| Other secured borrowings | 2,154 | 2,149 |
| Net (gains)/losses on interest rate swap contracts | (187) | 919 |
| Other finance charges | 1,022 | 528 |
| 35,866 | 36,371 | |
| Less: amounts capitalised as PP&E (Note 6(c)) | - | (373) |
| Total finance costs | 35,866 | 35,998 |
| Finance costs, net | 32,353 | 32,347 |