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Financial obligations (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 27, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 09, 2015
Disclosure of Financial obligations [Line Items] |  |  |  |
Notional amount | $ 275,000,000 | $ 275,000,000 | $ 275,000,000 |
Borrowings, interest rate basis | Three-month Libor plus 3% |  |  |
Borrowings, adjustment to interest rate basis | 3.00% |  |  |
Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |
Borrowings, interest rate basis |  | Nine-month Libor plus 4.75 percent |  |
Banco de Credito del Peru [Member] |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |
Notional amount |  | $ 61,667,000 | $ 61,667,000 |
Banco de Credito del Peru [Member] | Empresa de Generacion Huanza S.A. [Member] |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |
Borrowings, adjustment to interest rate basis |  | 2.75% | 4.60% | 4.75%
Banco de Credito del Peru [Member] | Extended financial lease contract [Member] | Empresa de Generacion Huanza S.A. [Member] |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |
Borrowings, adjustment to interest rate basis |  | 2.75% | 4.70% |

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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