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Available-for-sale financial assets (Details Textuals) - Minera Yanacocha SRL and subsidiary [Member] - USD ($) | 1 Months Ended | 12 Months Ended
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Nov. 30, 2008 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of available-for-sale financial assets [Line Items] |  |  |  |
Purchase of available-for-sale financial assets | $ 13 |  |  |
Non-current financial assets available-for-sale |  | $ 23,000,000 | $ 16,454,000 |
Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income |  | $ 3,244,000 | $ 651,000 | $ 757,000

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- Definition The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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