WebVermiculite 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 … WebVermiculite was mined in Libby, Montana, from the 1920s until the mine closed in 1990. While in operation, the mine in Libby produced most of the world’s supply of …
Expanded vermiculite ores examined in this study
WebLibby is a city in northwestern Montana, United States and the county seat of Lincoln County. The population was 2,775 at the 2024 census.. Libby suffered from the area's contamination from nearby vermiculite mines … Web01. sep 2006. · Location 7, sample 18 Libby Middle School track Douglas fir 0.13 million 0.13 million 0.25 million. ... From the tree bark samples collected surrounding the abandoned vermiculite mine in Libby, ... distance from new york to myrtle beach
Site Profile - WR Grace River Road - EPA OSC Response
Web01. mar 2001. · Then, in the fall of 1999, after more than 60 years of operation as a vermiculite mine (first owned by the Zonolite Company and then by W. R. Grace & amp; Company, which purchased it in 1963 and ... WebAbstract Mining operations began at a world-class ver-miculite deposit at Vermiculite Mountain near Libby, Montana, circa 1920 and ended in 1990. Fibrous and as-bestiform amphiboles intergrown with vermiculite ore are suspected to be a causative factor in an abnormally high number of cases of respiratory diseases in former mine and Web01. mar 2001. · Though the company's vermiculite mine closed in 1990, W. R. Grace has maintained a presence in Libby. Last year, the company helped fund a community health clinic to the tune of $260,000 a year ... distance from new york to minnesota