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Significant accounting principles and policies (Details Textual) | Dec. 31, 2017 | Dec. 31, 2016
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Written put options [member] |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |
Closing foreign exchange rate | 0.3082 | 0.2976
Purchased call options [member] |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |
Closing foreign exchange rate | 0.3088 | 0.2983
Sociedad Minera Cerro Verde S.A.A. [Member] | Written put options [member] |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |
Closing foreign exchange rate | 3.245 | 3.360
Sociedad Minera Cerro Verde S.A.A. [Member] | Purchased call options [member] |  |
DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory [Line Items] |  |
Closing foreign exchange rate | 3.238 | 3.352

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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