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Anonymous Proxy

#1 Jan 25, 2012
link, off topic, Gold miners discovered vermiculite in Libby in 1881; in the 1920s the Zonolite Company formed and began mining the vermiculite. In 1963, W.R. Grace bought the Zonolite mining operations. The mine closed in 1990.

While in operation, the Libby mine may have produced 80 percent of the world's supply of vermiculite. Vermiculite has been used in building insulation and as a soil conditioner, the vermiculite from the Libby mine was contaminated with a toxic form of naturally-occurring asbestos called tremolite-actinolite asbestiform mineral fibers.

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