Supreme Perlite Company, Portland, OR
Supreme Perlite Company
This site is located at 4600 North Suttle Road, Multnomah County, Portland, Oregon.
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 primarily received vermiculite from South African mines. Libby vermiculite was also known to be processed in the late 1960’s or early 1970’s. This site is currently operating.
This page last updated on December 08, 2008