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Financial Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finance income |  | $ 9,686 | $ 5,517 | $ 6,830
Special Mining Burden [Member] |  |  |  |
Finance income | [1] | 18,574 | 0 | 0
Other financial income [Member] |  |  |  |
Finance income |  | $ 9,515 | $ 5,350 | $ 954
[1] | 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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