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Financial obligations (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 27, 2016 | Dec. 31, 2015 | Dec. 02, 2009
--- | --- | --- | --- | --- | --- | ---
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | $ 275,000,000 | $ 275,000,000 |  | $ 275,000,000 |  |
Debt issuance costs | (3,618,000) | (2,425,000) |  |  |  |
Borrowings | 271,382,000 | 272,575,000 |  |  |  |
Financial liabilities | 587,062,000 | 633,083,000 | $ 592,342,000 |  | $ 353,710,000 |
Classification by maturity: |  |  |  |  |  |
Current portion | 46,166,000 | 83,991,000 |  |  |  |
Non-current portion (f) | 540,896,000 | 549,092,000 |  |  |  |
Financial Liabilities | 587,062,000 | 633,083,000 | $ 592,342,000 |  | $ 353,710,000 |
Empresa de Generacion Huanza S.A. [Member] |  |  |  |  |  |
Classification by maturity: |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | $ 119,000,000
Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Debt issuance costs | (976,000) | (1,377,000) |  |  |  |
Financial liabilities | 168,514,000 | 198,087,000 |  |  |  |
Classification by maturity: |  |  |  |  |  |
Financial Liabilities | 168,514,000 | 198,087,000 |  |  |  |
Finance lease liabilities | 93,514,000 | 118,087,000 |  |  |  |
BBVA Banco Continental S.A. [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 61,667,000 | 61,667,000 |  |  |  |
BBVA Banco Continental S.A. [Member] | Contacto Corredores de Seguros S.A. [Member] |  |  |  |  |  |
Classification by maturity: |  |  |  |  |  |
Finance lease liabilities | 0 | 10,000 |  |  |  |
Banco de Credito del Peru [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 61,667,000 | 61,667,000 |  |  |  |
CorpBanca New York Branch [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 61,666,000 | 61,666,000 |  |  |  |
Banco Internacional del Peru [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 30,000,000 | 30,000,000 |  |  |  |
Banco Internacional del Peru [Member] | Empresa de Generacion Huanza S.A. [Member] |  |  |  |  |  |
Classification by maturity: |  |  |  |  |  |
Finance lease liabilities | 94,490,000 | 119,464,000 |  |  |  |
Banco Internacional del Peru [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |  |  |
Classification by maturity: |  |  |  |  |  |
Finance lease liabilities | 147,166,000 | 162,411,000 |  |  |  |
ICBC Peru Bank [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 25,000,000 | 25,000,000 |  |  |  |
Banco Latinoamericano de Comercio Exterior S.A. [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 20,000,000 | 20,000,000 |  |  |  |
Banco de Sabadell, Miami Branch [Member] |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |
Notional amount | 15,000,000 | 15,000,000 |  |  |  |
Mid-term financial obligation [Member] | Sociedad Minera El Brocal S.A.A. [Member] |  |  |  |  |  |
Classification by maturity: |  |  |  |  |  |
Finance lease liabilities | $ 75,000,000 | $ 80,000,000 |  |  |  |

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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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