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Income tax and deferred taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Current tax assets, current |  | $ 32,291 | $ 51,632
Current tax assets, non-current |  | 32,179 | 32,179
Monthly provisional income tax payments, Chilean companies [Member] |  |  |
Current tax assets, current |  | 17,613 | 45,955
Current tax assets, non-current |  | 6,398 | 6,398
Monthly provisional payment Royalty [Member] |  |  |
Current tax assets, current |  | 588 | 3,542
Monthly provisional income tax payments, foreign companies [Member] |  |  |
Current tax assets, current |  | 1,644 | 1,323
Corporate tax credits [Member] |  |  |
Current tax assets, current | [1] | 944 | 748
Corporate tax absorbed by tax losses [Member] |  |  |
Current tax assets, current |  | 0 | 64
Taxes in recovery process [Member] |  |  |
Current tax assets, current |  | 11,502 | 0
Specific tax on mining activities paid on consignment [Member] |  |  |
Current tax assets, non-current |  | $ 25,781 | $ 25,781
[1] | These credits are available to companies and relate to the corporate tax payment in April of the following year. These credits include, amongst other items, training expense credits (SENCE) and property, plant and equipment acquisition credits that are equivalent to 4% of the property, plant and equipment purchases made during the year, In addition, some credits relate to the donations the Group has made during 2017 and 2016.

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