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v3.19.2

Cost of sales and expenses by their nature (Schedule of Cost of Sales and Administration Expenses) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Expenses by nature [abstract] |  |  |
Raw materials and consumables | $ 15,565,242 | $ 11,268,400 | $ 10,968,932
Electrical energy | 2,536,387 | 2,123,658 | 1,767,149
Ferroalloys | 1,973,586 | 1,734,914 | 1,403,206
Refractories | 613,563 | 492,781 | 466,815
Oxygen | 279,272 | 213,838 | 211,051
Electrodes | 1,463,091 | 419,741 | 276,473
Gas and fuels | 766,163 | 612,605 | 518,072
Labor | 3,181,556 | 2,699,414 | 2,931,108
Operation materials | 954,415 | 1,000,752 | 890,002
Depreciation and amortization | 1,112,418 | 1,465,759 | 1,429,380
Maintenance | 2,243,255 | 2,586,507 | 2,565,772
Other expenses | 954,379 | 615,100 | 625,120
Total expense | 31,643,327 | 25,233,469 | 24,053,080
Cost of sales | 30,563,315 | 23,994,526 | 22,775,593
Administrative expenses | $ 1,080,012 | $ 1,238,943 | $ 1,277,487

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