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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)

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