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Identification and business activity - Results of the discontinued operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating income      
Net sales $ 821,930 $ 1,106,329 $ 1,187,206
Cost of sales (799,582) (967,696) (947,953)
Gross loss (68,306) (183,019) (289,689)
Operating income (expenses), net      
Administrative expenses (76,297) (77,099) (80,666)
Total operating expenses, net (126,319) (124,721) (184,134)
Operating loss 58,013 (58,298) (105,555)
Other income (expense), net      
Finance costs, note 15(b) (42,173) (38,422) (34,551)
Net gain (loss) from currency exchange difference 734 1,384 (2,939)
Total other expenses, net 14,478 (31,265) (12,888)
Loss from discontinued operations 10,514 11,808 10,344
Discontinued Operations Mining Activities [Member]      
Operating income      
Net sales 97 16,666 36,736
Cost of sales (2) (15,261) (32,301)
Gross loss 95 1,405 4,435
Operating income (expenses), net      
Administrative expenses (8,048) (1,661) (3,872)
Changes in provision for closure of mining units, note 15(b) (1,912) (6,013) (12,701)
Reversal of provision for impairment of inventories, note 8(c) (320) 0 1,345
Reversal (provision) for contingencies (134) (9) (562)
Derecognition of long lived assets (44) (5,100) 0
Net loss in sale of mining units 0 0 (18,550)
Reversal of impairment loss 0 2,837 17,197
Reversal of provision for closure of mining units for sale of mining units 0 0 11,700
Others, net 117 (3,162) (8,438)
Total operating expenses, net (10,341) (13,108) (13,881)
Operating loss (10,246) (11,703) (9,446)
Other income (expense), net      
Finance costs, note 15(b) (266) (88) (766)
Net gain (loss) from currency exchange difference (2) 30 (10)
Total other expenses, net (268) (58) (776)
Loss before income tax (10,514) (11,761) (10,222)
Income tax 0 (47) (122)
Loss from discontinued operations $ (10,514) $ (11,808) $ (10,344)
Loss from the discontinued operations, per basic and diluted share, express in U. S. dollars $ (0.04) $ (0.03) $ (0.04)