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Investments in associates (Details 5) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Investments in associates [Line Items] |  |  |
Revenue | $ 1,274,378 | $ 1,068,791 | $ 929,522
Cost of sales | (980,254) | (824,973) | (922,572)
Sales expenses | (24,088) | (21,733) | (19,365)
Other operating expenses, net | (13,589) | 18,957 | (5,340)
Finance costs | 34,623 | 31,580 | 27,572
Finance income | 5,517 | 6,830 | 11,026
Net gain (loss) of exchange difference | 2,928 | 2,638 | (13,693)
Profit before income taxes | 92,545 | (255,237) | (340,549)
Income tax | 18,012 | 53,504 | 14,763
Net profit, reported | 64,435 | (327,814) | (375,545)
Group’s interest (19.584%) | 13,207 | (365,321) | (173,375)
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of Investments in associates [Line Items] |  |  |
Revenue | 3,202,931 | 2,384,154 | 1,115,617
Cost of sales | (1,768,238) | (1,553,040) | (862,004)
Sales expenses | (141,669) | (131,391) | (56,215)
Other operating expenses, net | (258,826) | (24,107) | (26,600)
Finance costs | (216,912) | (80,438) | (16,010)
Finance income | 5,350 | 954 | 512
Net gain (loss) of exchange difference | 13,288 | 7,857 | (75,770)
Profit before income taxes | 835,924 | 603,989 | 79,530
Income tax | (486,043) | (263,082) | (46,246)
Net profit, reported | 349,881 | 340,907 | 33,284
Group’s interest (19.584%) | $ 68,521 | $ 66,763 | $ 6,518

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_99&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_103&doctype=Standard -URIDate 2017-03-09 + Details
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