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Segment information (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues from external customers | S/ 1,225,639 | S/ 1,240,169 | S/ 1,231,015
Gross profit margin | 492,683 | 503,639 | 535,258
Other operating income, net | (4,357) | 2,444 | 3,913
Administrative expenses | (195,617) | (193,376) | (179,723)
Selling and distribution expenses | (46,567) | (39,899) | (31,481)
Impairment on brine project | (47,582) |  |
Finance costs | (73,759) | (75,397) | (36,807)
Finance income | 5,842 | 3,240 | 3,416
(Loss) gain from exchange difference, net | (2,226) | (2,541) | 12,194
Profit before income tax | 128,417 | 198,110 | 306,770
Income tax expense | (47,032) | (78,627) | (89,383)
Net income from continuing operations | 81,385 | 119,483 | 217,387
Loss for the year from discontinued operations | (754) | (6,589) | (5,720)
Profit for the year | 80,631 | 112,894 | 211,667
Cement, concrete and blocks [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues from external customers | 1,076,648 | 1,103,426 | 1,089,232
Gross profit margin | 476,919 | 487,671 | 517,266
Other operating income, net | (4,127) | 1,907 | 3,877
Administrative expenses | (174,087) | (173,200) | (161,950)
Selling and distribution expenses | (44,223) | (38,070) | (29,687)
Impairment on brine project |  |  |
Finance costs | (73,759) | (75,397) | (36,807)
Finance income | 5,779 | 3,194 | 3,384
(Loss) gain from exchange difference, net | (2,012) | (2,238) | 11,141
Profit before income tax | 184,490 | 203,867 | 307,224
Income tax expense | (67,568) | (80,912) | (89,515)
Net income from continuing operations | 116,922 | 122,955 | 217,709
Loss for the year from discontinued operations |  |  |
Profit for the year | 116,922 | 122,955 | 217,709
Construction supplies [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues from external customers | 66,442 | 59,888 | 75,565
Gross profit margin | 1,873 | 1,220 | 2,506
Other operating income, net | 36 | 136 | 4
Administrative expenses | (1,499) | (1,051) | (1,228)
Selling and distribution expenses | (2,287) | (1,643) | (1,519)
Impairment on brine project |  |  |
Finance costs |  |  |
Finance income | 48 | 24 | 32
(Loss) gain from exchange difference, net | (17) | (19) | 19
Profit before income tax | (1,846) | (1,333) | (186)
Income tax expense | 676 | 529 | 54
Net income from continuing operations | (1,170) | (804) | (132)
Loss for the year from discontinued operations |  |  |
Profit for the year | (1,170) | (804) | (132)
Quicklime [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues from external customers | 80,707 | 75,090 | 64,140
Gross profit margin | 13,671 | 14,216 | 15,116
Other operating income, net |  |  |
Administrative expenses | (15,613) | (14,464) | (11,306)
Selling and distribution expenses |  |  |
Impairment on brine project |  |  |
Finance costs |  |  |
Finance income |  |  |
(Loss) gain from exchange difference, net | (183) | (118) | 969
Profit before income tax | (2,125) | (366) | 4,779
Income tax expense | 778 | 145 | (1,392)
Net income from continuing operations | (1,347) | (221) | 3,387
Loss for the year from discontinued operations |  |  |
Profit for the year | (1,347) | (221) | 3,387
Other [Member] |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenues from external customers | 1,842 | 1,765 | 2,078
Gross profit margin | 220 | 532 | 370
Other operating income, net | (266) | 401 | 32
Administrative expenses | (4,418) | (4,661) | (5,239)
Selling and distribution expenses | (57) | (186) | (275)
Impairment on brine project | (47,582) |  |
Finance costs |  |  |
Finance income | 15 | 22 |
(Loss) gain from exchange difference, net | (14) | (166) | 65
Profit before income tax | (52,102) | (4,058) | (5,047)
Income tax expense | 19,082 | 1,611 | 1,470
Net income from continuing operations | (33,020) | (2,447) | (3,577)
Loss for the year from discontinued operations | (754) | (6,589) | (5,720)
Profit for the year | S/ (33,774) | S/ (9,036) | S/ (9,297)

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