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Provisions (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of changes in other provisions [Roll Forward] |  |  |
Balance at beginning | S/ 53,753 | S/ 61,518 |
Additions, notes 21 and 25 | 32,955 | 36,268 |
Change in estimates, note 22 | 522 | 5,259 |
Unwinding of discount, note 24 | (522) | (345) | S/ (788)
Payments and advances | (34,362) | (49,637) |
Balance at end | 52,868 | 53,753 | 61,518
Current portion | 24,575 | 31,711 |
Non-current portion | 28,293 | 22,042 |
Provisions | 52,868 | 53,753 |
Worker' Profit-Sharing [Member] |  |  |
Reconciliation of changes in other provisions [Roll Forward] |  |  |
Balance at beginning | 17,018 | 21,273 |
Additions, notes 21 and 25 | 21,554 | 18,692 |
Change in estimates, note 22 |  |  |
Payments and advances | (18,425) | (22,947) |
Balance at end | 20,147 | 17,018 | 21,273
Current portion | 20,147 | 17,018 |
Non-current portion |  |  |
Provisions | 20,147 | 17,018 |
Long-term Incentive Plan [Member] |  |  |
Reconciliation of changes in other provisions [Roll Forward] |  |  |
Balance at beginning | 34,368 | 36,906 |
Additions, notes 21 and 25 | 11,401 | 16,088 |
Change in estimates, note 22 | 477 |  |
Unwinding of discount, note 24 |  | 345 |
Payments and advances | (15,924) | (18,971) |
Balance at end | 30,322 | 34,368 | 36,906
Current portion | 4,200 | 13,817 |
Non-current portion | 26,122 | 20,551 |
Provisions | 30,322 | 34,368 |
Rehabilitation Provision [Member] |  |  |
Reconciliation of changes in other provisions [Roll Forward] |  |  |
Balance at beginning | 2,367 | 3,339 |
Additions, notes 21 and 25 |  | 1,488 |
Change in estimates, note 22 | 45 | 5,259 |
Payments and advances | (13) | (7,719) |
Balance at end | 2,399 | 2,367 | S/ 3,339
Current portion | 228 | 876 |
Non-current portion | 2,171 | 1,491 |
Provisions | S/ 2,399 | S/ 2,367 |

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- Definition The amount of current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase in existing other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase in other provisions through adjustments arising from the passage of time. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + Details
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