use of waste water, etc. Creation of 5 management units for wild flora and fauna conservation, registered with permits as Animal Management Units (UMAs). These policies and activities have positioned AHMSA and its companies as benchmarks in the field of Mexican steelworks and mining, establishing it as an example of high social responsibility Ticker Symbols AHMSA; IAM (ADR) NAICs Codes 212111 Bituminous Coal and Lignite Surface Mining 212112 Bituminous Coal Underground Mining 21221 Iron Ore Mining 331111 Iron & Steel Mills 331221 Cold-Rolled Steel Shape Manufacturing 331222 Steel Wire Drawing. References External links Corporate Website Manufacturing companies established in 1942 Mining companies of Mexico Non-renewable resource companies established in 1942 Mexican companies established in 1942