W.R. Grace/Solomon’s Mines
This site is located at 4220 West Glenrosa Avenue, Maricopa County, Phoenix, Arizona.
While the actual years of operations for the Phase 1 sites vary overall, we do know that the Libby, Montana mine operated from the 1920s until 1990. These Phase 1 sites may have received vermiculite from Libby at any time during these years. All Phase 1 sites ceased processing of the vermiculite by in the early 1990’s. This site ceased processing of Libby vermiculite in 1992 and is currently operating.
This page last updated on December 08, 2008