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SEGMENT INFORMATION (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure of entity's operating segments [Abstract]

Disclosure of operating segments

						Year ended December 31, 2020
						Steel						Mining						Inter-segment eliminations						Total
IFRS
Net sales						8,679,513						390,541						(334,619)						8,735,435
Cost of sales						(7,172,635)						(268,905)						341,617						(7,099,923)
Gross profit						1,506,878						121,636						6,998						1,635,512
Selling, general and administrative expenses						(740,056)						(22,826)						—						(762,882)
Other operating income, net						208,965						(2,122)						—						206,843
Operating income - IFRS						975,787						96,688						6,998						1,079,473
Management view
Net sales						8,679,513						384,255						(328,333)						8,735,435
Operating income						1,046,623						101,937						689						1,149,249
Reconciliation items:
Differences in Cost of sales																								(69,776)
Operating income - IFRS																								1,079,473
Financial income (expense), net																								22,331
Equity in earnings (losses) of non-consolidated companies																								57,555
Income before income tax expense - IFRS																								1,159,359
Depreciation and amortization - IFRS						(580,807)						(50,244)						—						(631,051)

						Year ended December 31, 2019
						Steel						Mining						Inter-segment eliminations						Total
IFRS
Net sales						10,186,171						364,058						(357,411)						10,192,818
Cost of sales						(8,552,493)						(259,535)						359,588						(8,452,440)
Gross profit						1,633,679						104,523						2,177						1,740,378
Selling, general and administrative expenses						(885,146)						(12,330)						—						(897,475)
Other operating expenses, net						21,931						(268)						—						21,663
Operating income - IFRS						770,466						91,924						2,177						864,566
Management view
Net sales						10,230,650						417,619						(410,972)						10,237,297
Operating income						841,169						146,636						2,177						989,982
Reconciliation items:
Differences in Cost of sales																								99,315
Effect of inflation adjustment (Note 3 (cc))																								(224,731)
Operating income - IFRS																								864,566
Financial income (expense), net																								(98,969)
Equity in earnings (losses) of non-consolidated companies																								60,967
Income before income tax expense - IFRS																								826,564
Depreciation and amortization - IFRS						(612,744)						(48,368)						—						(661,112)

4.    SEGMENT INFORMATION (continued)

						Year ended December 31, 2018
						Steel						Mining						Inter-segment eliminations						Total
IFRS
Net sales						11,453,420						282,000						(280,613)						11,454,807
Cost of sales						(8,524,890)						(239,893)						281,455						(8,483,328)
Gross profit						2,928,530						42,107						842						2,971,479
Selling, general and administrative expenses						(860,881)						(15,883)						—						(876,764)
Other operating expenses, net						12,950						706						—						13,656
Operating income - IFRS						2,080,599						26,930						842						2,108,371
Management view
Net sales						11,723,883						333,892						(332,505)						11,725,270
Operating income						1,768,115						91,418						(6,213)						1,853,319
Reconciliation items:
Differences in Cost of sales																								541,492
Effect of inflation adjustment (Note 3 (cc))																								(286,440)
Operating income - IFRS																								2,108,371
Financial income (expense), net																								(179,576)
Equity in earnings (losses) of non-consolidated companies																								102,772
Income before income tax expense - IFRS																								2,031,567
Depreciation and amortization - IFRS						(537,885)						(51,415)						—						(589,299)

Disclosure of geographical areas

						Year ended December 31, 2020
						Mexico						Southern region						Brazil and Other markets						Total
Net sales						4,660,278						1,762,785						2,312,372						8,735,435
Non-current assets (1)						4,726,342						919,490						1,767,432						7,413,264

						Year ended December 31, 2019
						Mexico						Southern region						Brazil and Other markets						Total
Net sales						5,477,690						1,704,132						3,010,996						10,192,818
Non-current assets (1)						4,584,802						1,008,860						1,889,757						7,483,419

						Year ended December 31, 2018
						Mexico						Southern region						Brazil and Other markets						Total
Net sales						6,345,137						1,941,168						3,168,502						11,454,807
Non-current assets (1)						4,093,288						1,071,705						1,665,140						6,830,133

(1) Includes Property, plant and equipment and Intangible assets.

Disclosure of products and services

						Year ended December 31,
						2020						2019						2018
Semi-finished (1)						3,632						51,496						103,099
Slabs						1,047,311						1,753,090						1,818,235
Hot rolled (2)						2,880,055						3,275,941						3,961,144
Cold rolled						1,101,963						1,165,406						1,264,940
Coated (3)						3,015,132						3,263,463						3,506,040
Roll-formed and tubular (4)						413,337						380,688						437,514
Other products (5)						274,005						302,734						363,835
TOTAL SALES						8,735,435						10,192,818						11,454,807

(1)Semi-finished includes billets and round bars.

(2)Hot rolled includes hot rolled flat products, merchant bars, reinforcing bars, stirrups and rods.

(3)Coated includes tin plate and galvanized products.

(4)Roll-formed and tubular includes tubes, beams, insulated panels, roofing and cladding, roof tiles, steel decks and pre-engineered metal building systems.

(5)Other products include mainly sales of energy and pig iron.

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