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Tax situation (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Profit before income tax | $ 92,545 | $ (255,237) | $ (340,549)
Income tax rate | 29.50% | 32.00% | 32.00%
Expected income tax expense | $ 12,797 | $ 46,710 | $ 10,957
Non - deductible expenses |  |  | 19,534
Royalty case |  |  | 0
Special mining tax and mining royalties |  |  | (4,672)
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 26% to 29.5%) | 0 | (1,431) | 2,347
Income tax true - ups |  |  | (6,082)
Others | 16,513 | 6,577 | 4,447
Current and deferred income tax charges to results | 263,433 | 222,594 | 31,183
Mining taxes charged to results |  |  | 14,599
Supplementary retirement fund charged to results | 9,330 | 2,725 | 464
Tax expense (income), continuing operations | 18,012 | 53,504 | 14,763
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Profit before income tax | $ 835,924 | $ 603,989 | $ 79,530
Income tax rate | 32.00% | 32.00% | 32.00%
Expected income tax expense | $ 267,496 | $ 193,276 |
Non - deductible expenses | 25,217 | 27,788 |
Royalty case | (12,029) | 0 |
Special mining tax and mining royalties | (21,704) | (12,084) |
Income tax rate change effect on deferred taxes for change in Peruvian tax law once the current Stability Contract expires (from 26% to 29.5%) | (1,632) | 13,850 |
Income tax true - ups | 10,210 | 1,677 |
Others | (4,125) | (1,913) |
Current and deferred income tax charges to results | 263,433 | 222,594 | $ 31,183
Mining taxes charged to results | 213,280 | 37,763 | 14,599
Supplementary retirement fund charged to results | 9,330 | 2,725 | 464
Tax expense (income), continuing operations | $ (486,043) | $ (263,082) | $ (46,246)
Effective income tax | 58.14% | 43.56% | 58.15%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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