Dearborn, MI
Zonolite Company/W.R. Grace

This site is located at 14300 Henn Street, Wayne County, Dearborn, Michigan.

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 operations in 1990.