Why is a former vermiculite processing plant site being evaluated?
ATSDR is evaluating a number of sites throughout the United States where
facilities received vermiculite from a mine in Libby, Montana. Vermiculite from Libby plants was found to
contain asbestos.
The former Zonolite/W.R. Grace facility in St. Louis received Libby vermiculite between the late 1940s and 1988.