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Financial Income (Tables) | 12 Months Ended
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Dec. 31, 2018
Financial Income [Abstract] |
Disclosure of detailed Information About Finance Income [Table Text Block] | This item is made up as follows:
|  | For the year ended December 31, 2018 |  |  | For the year ended December 31, 2017 |  |  | For the year ended December 31, 2016 |
|  | US$(000) |  |  | US$(000) |  |  | US$(000) |
Special Mining Burden (GEM) (a) |  |  | 18,574 |  |  |  | - |  |  |  | - |
Other financial income |  |  | 9,515 |  |  |  | 5,350 |  |  |  | 954 |
|  |  | 28,089 |  |  |  | 5,350 |  |  |  | 954 |
| (a) | Represents interest related to the GEM refund from the period October 2012 through December 2013 of US$18.6 million (see note 13(d)).

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