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Subsidiaries with material non-controlling interest (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | $ (761,134) | $ (701,862) |  |
Non-current assets | (3,456,087) | (3,630,951) |  |
Current liabilities | (399,182) | (521,194) |  |
Non-current liabilities | (788,474) | (747,992) |  |
Total shareholders' equity, net | 3,029,565 | 3,063,627 | $ 3,047,213 | $ 3,389,236
Shareholders of the parent | 2,808,328 | 2,848,037 |  |
Non-controlling interests | 221,237 | 215,590 |  |
Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 170,274 | 146,865 |  |
Non-current assets | 603,280 | 645,729 |  |
Current liabilities | (123,052) | (159,190) |  |
Non-current liabilities | (217,683) | (229,709) |  |
Total shareholders' equity, net | 432,819 | 403,695 |  |
Shareholders of the parent | 255,841 | 239,925 |  |
Non-controlling interests | 176,978 | 165,032 |  |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 7,154 | 6,640 |  |
Non-current assets | 0 | 0 |  |
Current liabilities | (2,653) | (2,407) |  |
Non-current liabilities | 0 | 0 |  |
Total shareholders' equity, net | 4,501 | 4,233 |  |
Shareholders of the parent | 2,701 | 2,540 |  |
Non-controlling interests | 1,800 | 1,693 |  |
Minera La Zanja S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 126,878 | 134,758 |  |
Non-current assets | 31,841 | 55,873 |  |
Current liabilities | (25,834) | (38,807) |  |
Non-current liabilities | (42,781) | (48,201) |  |
Total shareholders' equity, net | 90,104 | 103,623 |  |
Shareholders of the parent | 47,808 | 54,981 |  |
Non-controlling interests | 42,296 | 48,642 |  |
Apu Coropuna S.R.L. [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 2,263 | 1,440 |  |
Non-current assets | 182 | 189 |  |
Current liabilities | (1,165) | (143) |  |
Non-current liabilities | (740) | (740) |  |
Total shareholders' equity, net | 540 | 746 |  |
Shareholders of the parent | 377 | 523 |  |
Non-controlling interests | 163 | 223 |  |
Other minor subsidiaries [Member] |  |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |  |
Current assets | 0 | 665 |  |
Non-current assets | 0 | 30 |  |
Current liabilities | 0 | (29) |  |
Non-current liabilities | 0 | (2) |  |
Total shareholders' equity, net | 0 | 664 |  |
Shareholders of the parent | 0 | 664 |  |
Non-controlling interests | $ 0 | $ 0 |  |

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- Definition The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B12 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B12_b_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_66&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B10_b&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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