desert. The Company also has iron ore mines in some other Mexican states. Products AHMSA manufactures high value-added steel products. AHMSA is a national leader in the production and commercialization of flat steel products including hot rolled coil used for machinery parts, wide plate, cold rolled coil, tinplate and tin-free steel, railroad tanks and bridge constructions, structural shapes... It also produces non-flat steel products like heavy shapes. AHMSA operates at an annual production rate of 3.5 million metric tons of liquid steel, with a workforce of 22,250 people, including its subsidiary companies. Subsidiaries As of April 2014, its subsidiaries included: Cia. Real de Monte y Pachuca (RDM) Hojalata Mexicana SA. de CV. (HOMESA) Linea Coahuila-Durango SA de CV Minera del Norte Nacional de Acero SA. de CV. (NASA) Unidad Cerro del Mercado Unidad Hercules Unidad MICARE Unidad MIMOSA Quality AHMSA received the following quality labels : "Clean Industry" certifications issued by Mexico’s Environmental Protection Department Environmental prize granted by the Mexican Chamber of Mining Environmental Excellence Award granted by the Latin American Mining Organism AHMSA also complies with the following standards : The hot rolling department was approved by the audit of the quality system based on the European Standard EN 10025:2004 AHMSA was recertified for three more years by the ISO 14001 standard Integrated systems were established for quality, health and environment in Cold Rolling 1, Structural Shapes and Maintenance and Services MICARE, MIMOSA, CEMESA, Hércules and La Perla were approved by the ISO 9001:2000 standard, without observations Since 1992, AHMSA leads an active social policy where its plants are active, maintaining permanent programs on the following fronts: Installation and modernization of state-of-the-art steelworks and mining equipment that incorporates antipollution systems. Operating and administrative practices in line with international environmental standards and certified by accredited external auditors. Agreements with the Federal Environmental Protection Agency (PROFEPA) and with the National Water Commission (CNA), committing to the fulfillment of specific activities, established in the area of pollution control. Voluntary adoption of best environmental practices developed at the international level by the industry and certified by the ISO14001 standard. Integral rehabilitation of mined areas, with soil regeneration and repopulation of regional flora and fauna, as well as improvement of surroundings. Integral support programs for communities where AHMSA companies operate in the Central, Carboniferous, Northern and Desert regions of the state of Coahuila, particularly through waste collection programs, operation of landfills, management and