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Other assets | 12 Months Ended
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Dec. 31, 2018
Other assets abstract |
Other assets | 12. Other assets Other assets comprise the following at December 31:
|  | 2018 |  | 2017
|  | Non- |  |  |  |  |  | Non- |  |  |  |
|  | Current |  | Current |  | Total |  | Current |  | Current |  | Total
|  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000 |  | US$'000
Guarantees and deposits given |  | 2,208 |  | 11 |  | 2,219 |  | 2,022 |  | 8 |  | 2,030
Prepayments and accrued income |  | 16 |  | 3,672 |  | 3,688 |  | — |  | 2,977 |  | 2,977
Biological assets |  | 7,790 |  | — |  | 7,790 |  | 27,279 |  | — |  | 27,279
Other assets |  | 472 |  | 5,130 |  | 5,602 |  | 758 |  | 6,941 |  | 7,699
Total |  | 10,486 |  | 8,813 |  | 19,299 |  | 30,059 |  | 9,926 |  | 39,985
Biological assets comprise timber farms in South Africa, which are a source of raw materials used for the production of silicon metal. The biological assets are measured at fair value (see Note 28).

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