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Fair value measurement (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Fair value measurement liabilities [Abstract] |  |  |  |
- Embedded derivatives for concentrates sales, net | $ 0 | $ 1,524 |  |
- Contingent consideration liability | 17,570 | 19,343 | $ 16,994 | $ 23,026
- Hedge instruments | 28,705 | (3,863) |  |
Level 1 of fair value hierarchy [member] |  |  |  |
Fair value measurement liabilities [Abstract] |  |  |  |
- Embedded derivatives for concentrates sales, net | 0 | 0 |  |
- Contingent consideration liability | 0 | 0 |  |
- Hedge instruments | 0 | 0 |  |
Level 2 of fair value hierarchy [member] |  |  |  |
Fair value measurement liabilities [Abstract] |  |  |  |
- Embedded derivatives for concentrates sales, net | 7,424 | 1,524 |  |
- Contingent consideration liability | 0 | 0 |  |
- Hedge instruments | 28,705 | 3,863 |  |
Level 3 of fair value hierarchy [member] |  |  |  |
Fair value measurement liabilities [Abstract] |  |  |  |
- Embedded derivatives for concentrates sales, net | 0 | 0 |  |
- Contingent consideration liability | 17,570 | 19,343 |  |
- Hedge instruments | $ 0 | $ 0 |  |

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- Definition The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + 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 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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