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Altos Hornos De Mexico SA (AHMSA) steel plant

mothballed

Monclova, North America, Mexico

GEM wiki

Process Route

BFBOFEAF

Timeline

Operating1944
Idled2022

Emissions

2025

2.57 Mt CO₂e

1.23 t CO₂e per tonne of steel

Typical BF-BOF route: 1.8–2.0 t/t

Modelled estimate (Climate TRACE), not reported data. Methodology

Capacity (ttpa)

Crude Steel

5,500

EAF

1,200

BOF

4,300

Blast Furnace

4,380

Sinter

2,263

Coking

821

Pelletising

4,200

Production

Crude steelproduction, GEM-compiled (Global Iron & Steel Tracker). Dashed line shows nominal capacity.

Iron Units

BF
BF 5mothballed
2,628 ttpa2210 m³ · relined 2014wiki
BF
BF 6mothballed
1,752 ttpa1392 m³wiki

Steel Units

EAF
unknown EAF (1)mothballed
1,200 ttpa160 twiki
BOF
unknown BOF (1)mothballed
300 ttpawiki
BOF
unknown BOF (2)mothballed
300 ttpawiki
BOF
unknown BOF (3)mothballed
300 ttpawiki
BOF
unknown BOF (4)mothballed
1,700 ttpawiki
BOF
unknown BOF (5)mothballed
1,700 ttpawiki

Inputs & Energy

Power 40 MW onsite gas-fired power plant (generates more than 50% of steel plant's electricity)

Iron ore MINOSA & CEMESA Mexican iron mining subsidiaries

Met coal MICARE & MIMOSA Mexican coal-mining subsidiaries

Steel Products

sheet, profile, plate

Ownership

Owner Altos Hornos de Mexico SAB de CV

Parent Grupo Acerero del Norte SA de CV [64.0%]; small shareholder(s) [36.0%]

Workforce 7,366 employees

Country Context

Mexico crude steel production (USGS). Plant line shows nominal capacity, not output.

Explore

Plant data sourced from the Global Iron & Steel Tracker (March 2026), Global Energy Monitor. Licensed under CC BY 4.0.

Production data: USGS Minerals Yearbook — Raw Steel: World Production by Country or Locality (2019 edition; 2022 and 2023 early release tables). U.S. Geological Survey, public domain. EAF/BOF splits: USGS Minerals Yearbook (2023 estimates).

Facility emissions estimates from Climate TRACE. Licensed under CC BY 4.0.