Name: Asbestos Mineral Occurrences

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Description: This database includes occurrences of asbestos minerals found in mining districts in New Mexico that have been reported in the literature or in unpublished reports and field notes at the New Mexico Bureau of Geology and Mineral Resources, as of 2015. Any economic potential or health risk associated with these occurrences is not implied and each area must be examined by a qualified geologist. Asbestos is a mineral group that consists of six different silicate minerals that can be fibrous in crystalline form. OSHA defines asbestos fiber as any particle that is 5 microns or longer, with a length-to-width ratio of 3 to 1 or longer. Asbestos minerals can be found in bundles of fibers, which can be separated from the host matrix. The fibers have high tensile strength. The aspect ratios range from 20 to 100. The fibers are flexible and can be spun. Asbestos minerals are found in a variety of mineral deposits and can pose a health risk, specifically asbestosis, lung cancer, and mesothemlioma. In New Mexico, asbestos minerals are found in small amounts in some limestones adjacent to Laramide Cu and Pb-Zn skarn deposits, Laramide (polymetallic) vein deposits, Mo-W-Be contact metasomatic deposits, and porphyry copper deposits. Asbestos minerals are found in serpentinized ultramafic and mafic rocks in some Proterozoic terranes in New Mexico and can be associated with talc deposits. The amount of asbestos is so small in these areas in New Mexico that it is unlikely that significant quantities of asbestos minerals would be found in any alluvial deposits adjacent to these areas. There has been no eported production of asbestos minerals from New Mexico. However, nonfibrous ricolite (a form of serpentine) has been produced from the Ricolite district in the Redrock area (Ricolite district) of the Burro Mountains for carving, decorative, and dimension stone. Fibrous ricolite also is found in the Redrock area. The amount of asbestos is so small in these areas that it is unlikely that any health risk exists for residents and visitors in these areas. However, workers and others that could be exposed to dust in these areas that could contain asbestos minerals should have the dust examined for potential asbestos minerals and, if present, follow appropriate protection recommendations. For more information see http://geoinfo.nmt.edu/resources/minerals/industrial/asbestos/home.html

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