vermiculite ore contaminated

STRATEGY FOR FURTHER ASSESSMENT OF VERMICULITE ORE ...

An estimated 105 exfoliation facilities in the US received vermiculite ore from the Libby mine. Because environmental contamination is more likely, exfoliation facilities (both former and current) that are thought to have received asbestos-contaminated ore from …

Libby, Montana — The Asbestos Outbreak

Libby, Montana, is the site of one of America's worst man-made environmental disasters. Toxic asbestos dust from the vermiculite mines that helped the town prosper for decades has killed hundreds of residents, sickening thousands more.

Vermiculite - Wikipedia

Vermiculite is a hydrous phyllosilicate mineral. It undergoes significant expansion when heated. Exfoliation occurs when the mineral is heated sufficiently, and the effect is routinely produced in commercial furnaces. Vermiculite is formed by weathering or hydrothermal alteration of biotite or …

Dallas Home to Asbestos Contaminated Horticultural ...

Sep 18, 2018· Unfortunately, Libby vermiculite, unlike vermiculite ore from other mines, is contaminated with asbestos and was a ubiquitous ingredient in hundreds of applications from attic insulation, insulating cements, acoustical plasters and other construction products in addition to horticultural uses prior to 1990.

W.R Grace Libby, Montana Asbestos Contamination - 1612 ...

It is considered the worst asbestos contamination site in the United States of America. The contamination was caused by W.R Grace, which was a mining company that operated a vermiculite mine in the town from 1963 to 1990 (Peacock, 2008, p. 23). There were asbestos fibers in the vermiculite ore that was extracted in Libby.

U.S. Government Accountability Office

According to the plant manager, both International Vermiculite and Thermic Refractories had received vermiculite ore from the Libby mine and the ore was exfoliated at the site. The manager said, to his knowledge, waste material was not disposed of on-site and that Thermic Refractories had stopped using Libby ore around 1985 or 1986.

EPA refused to warn of asbestos dangers - seattlepi.com

The ore and the finished vermiculite product were sold by W.R. Grace & Co., often under the brand name Zonolite. It's impossible to know how many homes contain insulation made from the ore.

Asbestos Contamination: Health Impacts Of One Of The ...

Nov 02, 2009· Over nearly a century, thousands of residents and workers in Libby, Mont., have been exposed to asbestos-contaminated vermiculite ore, leading to markedly higher rates of …

Vermiculite Intermountain HC-02-27-2007release

Vermiculite ore from Libby, Montana mine contained high levels of amphibole asbestos, and asbestiform fibers and has been associated with asbestos related disease among Libby residents. Human exposure to the contaminated vermiculite has possibly occurred in

An examination of I Arbertor National eview I

An examination of sites receiving asbestos-contaminated vermiculite ore from Libby, Montana I National Arbertor dl ~ 4 I i I I eview I 1 Toll-free Information: 1-888-422-8737 p>

W.R. Grace indicted in Libby asbestos deaths - seattlepi.com

Exposure to the tremolite asbestos fibers, which contaminate the vermiculite ore, has caused hundreds of cases of asbestosis, lung cancer and mesothelioma in Libby and an untold number at hundreds ...

Schundler Company Vermiculite Technical Information ...

Dec 07, 2014· Finally because of the current confusion about vermiculite and asbestos, our plant was inspected recently (February 7, 2000) by representatives of the federal Environmental Protection Agency. Twelve samples of our vermiculite were taken from random areas of our ore piles, and then tested by Lockheed Martin Technology Services Group.

Hazardous Substance Tools: What about vermiculite?

Only a few vermiculite ores contain asbestos. However, between 1960 and 1990, 70 percent of the world’s vermiculite ore came from a mine in Libby, MT, and was marketed as Zonolite. That particular ore is contaminated with tremolite, one of the six asbestos mineral forms.

New Asbestos Testing Method For Vermiculite Accurate And ...

Much of the world’s supply of vermiculite that has been mined over the years (circa 1920 through 1990) came from a mine in Libby, Mont., and this vermiculite ore was contaminated with low amounts of asbestos (namely tremolite, an amphibole asbestos, and sometimes chrysotile, serpentine asbestos).

Study of Asbestos Contamination of Former Vermiculite ...

----- Abstract The Environmental Protection Agency (EPA) has determined that vermiculite ore mined at the former W.R. Grace vermiculite mine in Libby, Montana, is contaminated with asbestos. Libby ore was processed at vermiculite exfoliation plants across …

Vermiculite - Wikipedia, the free encyclopedia

possibility of asbestos contamination, particularly with US mined vermiculite ore.[citation needed] Ironically, both sides were defending against lawsuits in the asbestos litigation and eventually stopped pointing out these particular weak spots about one another. Most affected manufacturers are

Vermiculite - an overview | ScienceDirect Topics

This mine had a natural deposit of asbestos, which resulted in the vermiculite being contaminated with asbestos. Attic insulation produced using vermiculite ore, particularly ore that originated from the Libby mine, may contain asbestos fibers.

Vermiculite Health, Safety and Environmental Aspects

Vermiculite and other ore bodies can contain a variety of associated minerals such as mica, quartz, feldspar, etc. ... vermiculites contaminated with trace amounts of asbestiform material. Vermiculite ore ... Information given in this booklet is only intended as an introduction to health, safety and environmental aspects of vermiculite. It does ...

Exposure to Asbestos-Containing Vermiculite Ore and ...

Jul 01, 2010· 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 contamination of the community. The mine closed in 1990.

Big Tex Asbestos Contamination Resolved

May 15, 2012· Vermiculite ore is refined by rapidly expanding the ore with heat, a process known as exfoliation. As water in the ore becomes steam, it causes the rock to explode. The result is a lightweight, fire-resistant construction material. Vermiculite contaminated with asbestos can release airborne asbestos fibers and they can be inhaled by anyone ...

GAO-03-469 Hazardous Materials: EPA's Cleanup of Asbestos ...

Libby vermiculite ore processed to remove impurities remained contaminated with asbestos. Nonetheless, EPA misjudged the extent of contamination at Libby and focused instead on higher-priority asbestos contamination issues at other locations. Although EPA had received citizen complaints about potential health risks with this vermiculite ore

What is vermiculite insulation? my attic? Do I have ...

supply of vermiculite came from a mine near Libby, Montana. This mine had a natural deposit of asbestos which resulted in the vermiculite being contaminated with asbestos. Attic insulation produced using vermiculite ore, particularly ore that originated from the Libby mine, may contain asbestos fibers. Today, vermiculite is mined at

Supreme Perlite Portland, Oregon

with asbestos from vermiculite ore that was received from Libby, Montana and processed at Supreme Perlite 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 1968 through 1974. This factsheet outlines some of the important findings from

Hazardous Materials: EPA May Need to Reassess Sites ...

Oct 12, 2007· Between 1923 and the early 1990s, a mine near Libby, Montana, shipped millions of tons of asbestos-contaminated vermiculite ore to sites throughout the United States. In 2000, the Environmental Protection Agency (EPA) began to clean up asbestos contamination at the Libby mine and evaluate those sites that received the ore to determine if they were contaminated.

Radiographic Evidence of Nonoccupational Asbestos Exposure ...

Vermiculite ore from a mine near Libby, Montana, is known to be contaminated with amphibole asbestos (primarily winchite, rich-terite, 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

Vermiculite, Respiratory Disease, and Asbestos Exposure in ...

Jan 03, 2007· Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of …

GAO-08-71 Hazardous Materials: EPA May Need to Reassess ...

Asbestos-Contaminated Ore from Libby, Montana, Highlights of . GAO-08-71, a report to and Should Improve Its Public Notification Process. congressional requesters Between 1923 and the early 1990s, a mine near Libby, Montana, shipped millions of tons of asbestos-contaminated vermiculite ore to sites throughout the United States.

VERMICULITE IS NOT ASBESTOS

• All vermiculite ores contain a range of other minerals that were formed along with the vermiculite in the rock. Vermiculite ores from some sources were even found to contain asbestos minerals but asbestos is not intrinsic to vermiculite and only a few ore bodies have been found to contain more than tiny trace amounts.

Libby vermiculite exposure and risk of developing asbestos ...

The vermiculite ore formerly mined in Libby, Montana, contains asbestiform amphibole fibers of winchite, richterite, and tremolite asbestos. Because of the public health impact of widespread occupational and nonoccupational exposure to amphiboles in Libby vermiculite…

Vermiculite, Respiratory Disease, and Asbestos Exposure in ...

Jan 03, 2007· Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of homes in …

Protect Your Family from Asbestos-Contaminated Vermiculite ...

Sizes of vermiculite products range from very fine particles to large (coarse) pieces nearly an inch long. Top of Page. Concerns about Asbestos-contaminated Vermiculite Insulation. A mine near Libby, Montana, was the source of over 70 percent of all vermiculite sold in …

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