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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating income      
Sales of goods $ 637,619 $ 821,930 $ 1,106,329
Cost of sales (652,613) (799,582) (967,696)
Gross profit (loss) (23,929) (68,306) (183,019)
Operating income (expenses), net      
Reversal (provision) of contingent and others     (11,248)
Administrative expenses (67,185) (76,297) (77,099)
Reversal of Impairment loss of long-lived assets, note 11(b) 2,083 (2,083) 5,693
Total operating expenses, net (105,203) (126,319) (124,721)
Operating profit (loss) 81,274 58,013 (58,298)
Other income (expense), net      
Finance costs, note 15(b) (37,822) (42,173) (38,422)
Net gain (loss) from currency exchange difference 4,116 734 1,384
Profit (loss) from discontinued operations (5,409) 10,514 11,808
Discontinued Operations Mining Activities [Member]      
Operating income      
Sales of goods (1) 97 16,666
Cost of sales 0 (2) (15,261)
Gross profit (loss) (1) 95 1,405
Operating income (expenses), net      
Income from sale of development costs, property, plant and equipment (sale of Mallay mining unit) 7,976    
Reversal of provision for closure of mining unit (sale of Mallay mining unit), nota 15(b) 5,093    
Reversal of provision for impairment of value of inventory (sale of Mallay mining unit), note 8(c) 1,220    
Income from sale of supplies (sale of Mallay mining unit) 606    
Reversal (provision) of contingent and others 13 (134) (9)
Cost of sale of development costs, property, plant and equipment, nota 11(a) (3,099) (44) (5,100)
Administrative expenses (3,243) (8,048) (1,661)
Cost of sale of supplies (sale of Mallay mining unit) (1,711)    
Provision for impairment of value of inventory, note 8(c) (377) (320)  
Changes in provision for closure of mining units (58) (1,912) (6,013)
Reversal of Impairment loss of long-lived assets, note 11(b) 0   2,837
Others, net (846) 117 (3,162)
Total operating expenses, net 5,574 (10,341) (13,108)
Operating profit (loss) 5,573 (10,246) (11,703)
Other income (expense), net      
Finance costs, note 15(b) (176) (266) (88)
Net gain (loss) from currency exchange difference 12 (2) 30
Profit (loss) before income tax 5,409 (10,514) (11,761)
Income tax 0   (47)
Profit (loss) from discontinued operations $ 5,409 $ (10,514) $ (11,808)
Profit (loss) from the discontinued operations, per basic and diluted share, express in U. S. dollars $ 0.03 $ (0.04) $ (0.03)