Vermiculite ore mined near Libby, Montana, which accounted for more than half the worldwide production of vermiculite from 1925 to 1990, was contaminated with asbestos and asbestoslike fibers. Workplace exposure to these fibers caused a serious health problem in local miners and millers, as well as some downstream workers.
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Vermiculite ore mined near Libby, Montana, which accounted for more than half the worldwide production of vermiculite from 1925 to 1990, was contaminated with asbestos and asbestoslike fibers. Workplace exposure to these fibers caused a serious health problem in local miners and millers, as well as some downstream workers.
Vermiculite ore from a mine near Libby, Montana, is known to be contaminated with amphibole asbestos primarily winchite, richterite, and tremolite, which is liberated in the mining and processing of the ore Agency for Toxic Substances and Disease Registry ATSDR 2008 Meeker et al. 2003. The mining and processing of vermiculite in Libby
Jul 01, 2010018332Mortality in a cohort of vermiculite miners exposed to fibrous amphibole in Libby, Montana. Occup Environ Med 614363366 15031396. Crossref, Medline, Google Scholar McDonald JC, Sebastien P, Armstrong B. 1986. Radiological survey of past and present vermiculite miners exposed to tremolite. Br J Ind Med 437445449 3013279. Medline, Google ...
Disease Progression in Persons Exposed to Asbestos Contaminated Vermiculite Ore in Marysville, Ohio R01 CDCs Procurement and Grants Office has published a funding opportunity announcement entitled, quotDisease Progression in Persons Exposed to Asbestos Contaminated Vermiculite Ore in Marysville, Ohio R01.quot Approximately 500,000 will be available in fiscal year 2009 to fund one award.
with asbestos from vermiculite ore that was received from Libby, Montana and processed at the former Vermiculite Northwest facility in Portland, Oregon. The evaluation focused on ways that people could have been or may be exposed to asbestos from vermiculite processed at this site from 1967 until it …
None of the ore bodies currently used by major vermiculite producers pose an asbestos health risk to workers when the material is processed in accordance with the applicable MSDS. In August 2000, the United States Environmental Protection Agency EPA issued a report regarding vermiculite …
Vermiculite is a mineral that rapidly expands when heated. Expanded vermiculite is used in construction and consumer materials. Vermiculite mined near Libby, Montana, which accounted for more than half the worldwide production of vermiculite from 1925 to 1990, was contaminated with asbestos and asbestoslike fibers.
Jun 17, 2019018332What is vermiculite Vermiculite is a mineral that was used for insulation. If your home was built before 1990, you might have vermiculite insulation in your walls or attic. Up to 85 percent of all vermiculite insulation in the U.S. came from a mine in Libby, Montana, sold under the name Zonolite.
By now many people are familiar with the story of the W.R. Grace vermiculite mine in Libby, Montana. Grace owned and operated the mine from 1960 to 1993, mining an ore that is heated, crushed and then used for insulation products. The vermiculite in the Libby mine is contaminated with tremolite asbestos.
The story can be traced back to 1919 when companies first started pulling vermiculite out of mines in Libby. Known commercially as Zonolite, vermiculite was used in a variety of construction materials, including insulation for homes and buildings. Decades of mining the vermiculite exposed workers and residents to toxic asbestos dust.
Vermiculite ore deposits, like most other rocks, contain an assemblage of other minerals besides the vermiculite Addison and Davies 1990. There may be major components such as feldspars, pyroxenes, amphiboles, carbonates, and quartz, as well as minor components such as phosphates, iron oxides, titanium oxides and zircon Atkinson et al 1982.
The plant utilized vermiculite ore from Libby for much of those 50 to 60 years, meaning many of the plant’s workers and nearby residents were at risk. Approximately 6,000 people who worked at or lived near the plant during that time were included in a recent …
Vermiculite from South Africa and South Carolina are minimally contaminated with asbestos, unlike vermiculite mined in Montana and Quebec. In these latter two areas, vermiculite ore deposits contain other minerals including tremolite. It is the tremolite and other asbestiform fibers that have significant implication to human health.
Mar 07, 2009018332When WR Grace bought the mine in 1963 it was producing 80 of the worlds vermiculite and Libby was proud of it. But naturally occurring amid the mineral were traces of a dangerous form of asbestos.
N2 Community exposure to asbestos from contaminated vermiculite ore from Libby, Montana, occurred in many processing sites in the United States, including a densely populated urban residential neighborhood of Minneapolis, Minnesota.
People may be occupationally exposed to vermiculite in workrelated activities involving insulation and other construction or home materials, agricultural and horticultural materials such as potting mixes and soil conditioners, brake shoes and pads, and other products. ... show that vermiculite ore mined near Libby until 1990 was contaminated ...
Products made from vermiculite ore produced by the Libby Mine were not widely used after the mid1980’s and have not been on the market in Canada since 1990. Asbestos can cause lung disease including lung cancer in people who are exposed to airborne particles. Asbestos poses health risks only when fibers are present in the air that people ...
The exfoliation, or popping, of vermiculite ore at Vermiculite NW released significant amounts of asbestos fibers inside the facility and vented contaminated asbestos dust outside that may have been carried into the nearby neighborhood. Onsite soil samples revealed detectable levels of asbestos, and offsite samples showed trace levels of ...
The vermiculite ore as fed to the mill contained 46 of amphibole fibre in the tremolite series. Vital status was established in all but one of the 406 and ... Cohort study of mortality of vermiculite miners exposed to tremolite 439 MINERALOGY It is well established that the vermiculite deposit in Libby is contaminated by asbestiform fibres.17 ...
W.R. Grace bought the vermiculite mine in Libby in 1963 from the Zonolite Company. More than 1.5 billion pounds of raw contaminated ore was sent to processing plants across Canada. From a third to a half of the vermiculite from this mine was sold as attic insulation from the 1940s until 1984, when its sale by the company was discontinued.
an ore called quotvermiculitequot exposed workers, their families, and thousands of town residents to a toxic form of asbestos, creating what the Environmental Protection Agency EPA has called the worst case of industrial poisoning of a whole community in American history. 2. Play the video clip, “Working at the Mine” length 1212 and ask
Libby Amphibole asbestos LAA is a mixture of amphibole fibers present in ore from the vermiculite mine near Libby, MT 1. Workers and community residents were exposed to LAA at the mining operations in Libby, MT 2, 3, as well as at vermiculite processing facilities in Marysville, OH 4, 5, and Minneapolis, MN 6. Epidemiologic studies of these populations indicate that exposure to LAA ...
Sep 12, 2020018332The potential for health risks to humans exposed to the asbestos minerals continues to be a public health concern. Although the production and use of …
Sizes of vermiculite products range from very fine particles to large coarse pieces nearly an inch long. Top of Page. Concerns about Asbestoscontaminated Vermiculite Insulation. A mine near Libby, Montana, was the source of over 70 percent of all vermiculite sold in …
The company has been sued by nearly 200 former workers or their families, and is now the subject of a class action lawsuit representing some 26,000 people exposed to asbestos from contaminated vermiculite ore, including mineworkers, processing plant employees and Libby residents.
Vermiculite is a mineral with a flaky, fluffylooking structure. Previous studies revealed that the vermiculite ore mined in Libby, Mont., contained increased levels of an asbestoslike mineral ...
Prior to the early 1990s, between 50 to 80 of the worlds supply of vermiculite ore was mined near Libby, Montana, where sodiccalcic elongate amphiboles 1 were a common mineral impurity ATSDR ...
The Centers for Disease Control concluded in a report last week that 28 plants across the nation that processed large amounts of vermiculite ore. from Libby exposed workers, families and some ...
Workers Exposed To Libby Vermiculite Ore Have High Rate Of Chest Wall Abnormalities. SAN DIEGO More than onequarter of tested workers at an Ohio manufacturing plant historically exposed to asbestoscontaining vermiculite ore exhibited signs of scarring of the chest wall lining, a study by researchers from the University of Cincinnati has found.
Tremolite asbestos is a contaminant of vermiculite—an ore resembling mica that is used in housing insulation Zonolite, soil conditioners, fertilizers, cement mixtures and as an ingredient in animal feed Verxite. From 1924 to 1990, Zonolite Mountain in Libby, Montana, was the site of a vermiculite …
The vermiculite workers are an example of the effect of amphibole asbestos at concentrations of ≈1 in the ore. The mortality experience of the two asbestosexposed groups are distinctly similar. Each shows an elevated risk of lung cancer, mesothelioma, and asbestosis a nonmalignant respiratory disease.
Jul 01, 2010018332McDonald JC, Harris J, Armstrong B. 2004. Mortality in a cohort of vermiculite miners exposed to fibrous amphibole in Libby, Montana. Occup Environ Med 614363366. McDonald JC, Sebastien P, Armstrong B. 1986. Radiological survey of past and present vermiculite miners exposed to tremolite. Br J Ind Med 437445449.
Libby, Montana, was home to the largest vermiculite ore mine in the United States. The processing, use, and transport of the ore, which was contaminated with amphibole asbestos, led to generalized ...
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