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Prepaid expenses | 12 Months Ended
--- | ---
Dec. 31, 2017
Disclosure of Prepaid expenses [Abstract] |
Disclosure of prepayments and other assets [text block] |
9. | Prepaid expenses
| (a) | This caption is made up as follows:
|  | 2017 |  | 2016 |
|  | US$(000) |  | US$(000) |
Prepaid rentals (b) |  |  | 28,349 |  |  | 29,235 |
Prepaid insurances |  |  | 12,401 |  |  | 6,055 |
Deferred costs of works for taxes |  |  | 2,013 |  |  | 1,801 |
Deferred royalties and rentals of mining concessions |  |  | 387 |  |  | 2,377 |
Other prepaid expenses |  |  | 1,956 |  |  | 2,355 |
|  |  | 45,106 |  |  | 41,823 |
Classification by maturity: |  |  |  |  |  |  |
Current portion |  |  | 17,551 |  |  | 11,392 |
Non-current portion |  |  | 27,555 |  |  | 30,431 |
|  |  | 45,106 |  |  | 41,823 |
| (b) | This item corresponds to the balance of an original prepayment of US$31 million for the lease of hydraulic installations by the subsidiary Empresa de Generacion Huanza S.A. This prepayment is being charged to results during the life of the underlying assets (35 years) since January 2015.

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- Definition The disclosure of prepayments and other assets. [Refer: Other assets; Prepayments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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