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Identification and business activity (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating income |  |  |
Net sales | $ 1,223,942 | $ 1,015,670 | $ 846,269
Total income | 1,274,378 | 1,068,791 | 929,522
Operating costs |  |  |
Cost of sales, excluding depreciation and amortization | 980,254 | 824,973 | 922,572
Depreciation and amortization | (213,722) | (192,647) | (232,583)
Mining royalties | (31,217) | (27,611) | 27,188
Total operating costs | (980,254) | (824,973) | (922,572)
Gross loss | (294,124) | (243,818) | (6,950)
Operating income (expenses), net |  |  |
Impairment loss of long-lived assets, note 11(b) | 21,620 | 0 | 3,803
Administrative expenses | 83,597 | 81,692 | 84,372
Operating loss | (105,516) | (132,196) | 136,935
Reversal of Impairment loss of long-lived assets for sale of mining units and other assets | (11,770) | 0 | 0
Other, net | 258,826 | 24,107 | 26,739
Total operating expenses, net | 188,608 | 111,622 | 143,885
Other income (expense), net |  |  |
Finance costs, note 15(b) | 34,623 | 31,580 | 27,572
Net gain (loss) from currency exchange difference | (2,928) | (2,638) | 13,693
Total other expenses, net | (12,971) | (387,433) | (203,614)
Loss from discontinued operations | 10,098 | 19,073 | 20,233
Discontinued Operations Mining Activities [Member] |  |  |
Operating income |  |  |
Net sales | 0 | 1,149 | 22,740
Total income | 0 | 1,149 | 22,740
Operating costs |  |  |
Cost of sales, excluding depreciation and amortization | 0 | (4,842) | (19,540)
Exploration | 0 | (3,777) | (1,847)
Depreciation and amortization | 0 | (5,049) | (9,882)
Mining royalties | 0 | (11) | (223)
Total operating costs | 0 | (13,679) | (31,492)
Gross loss | 0 | (12,530) | (8,752)
Operating income (expenses), net |  |  |
Changes in provision for closure of mining units, note 15(b) | (12,701) | (3,365) | (45)
Net loss in sale of mining units | (18,550) | (3,014) | 0
Impairment loss of long-lived assets, note 11(b) | 0 | (2,043) | (7,452)
Administrative expenses | (941) | (111) | (2,234)
Reversal (provision) for contingencies | (423) | 901 | (381)
Operating loss | (9,406) | (18,049) | (19,469)
Gain (loss) for sale in other assets | (162) | 3,200 | 0
Reversal of Impairment loss of long-lived assets for sale of mining units and other assets | 17,197 | 0 | 0
Reversal of provision for closure of mining units for sale of mining units | 11,700 | 0 | 0
Reversal of provision for impairment of inventories | 1,345 | 706 | 1,474
Other, net | (6,871) | (1,793) | (2,079)
Total operating expenses, net | (9,406) | (5,519) | (10,717)
Other income (expense), net |  |  |
Finance costs, note 15(b) | (694) | (970) | (890)
Net gain (loss) from currency exchange difference | 2 | (50) | 129
Total other expenses, net | (692) | (1,020) | (761)
Loss before income tax | (10,098) | (19,069) | (20,230)
Income tax | 0 | (4) | (3)
Loss from discontinued operations | $ (10,098) | $ (19,073) | $ (20,233)
Loss from the discontinued operations, per basic and diluted share, express in U. S. dollars | $ (0.04) | $ (0.07) | $ (0.08)

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- Definition The amount recognised as an increase of the carrying amount of an asset or cash-generating unit to its recoverable amount when an impairment loss had been previously recognised. [Refer: Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The tax expense relating to the profit (loss) arising from ordinary activities of discontinued operations. [Refer: Discontinued operations [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2017-01-01 -Paragraph 33 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_ii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_h_ii&doctype=Standard -URIDate 2017-03-09 + Details
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