XML 120 R106.htm IDEA: XBRL DOCUMENT v3.8.0.1
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)