Cabot Corporation
Location of Plants served or currently serving: Illinois, Malaysia
FMC Corporation
Location of Plants served or currently serving: Idaho
Getchell Gold Corporation
Location of Plants served or currently serving: Nevada
Kennecott Corporation
Location of Plants served or currently serving: Wyoming
Kerr McGee Chemical Corporation
Location of Plants served or currently serving: Idaho
Omya
Location of Plants served or currently serving: California and Arizona
Schoenmann Produce Co.
Location of Plants served or currently serving: Texas and Colorado
Simplot Co.
Location of Plants served or currently serving: Idaho and Nevada
Specialty Minerals, Inc., Barretts Minerals, Inc., and Minteq International, Inc.
Location of Plants served or currently serving: California, Michigan, Montana, Maine, Arizona, Connecticut, Pennsylvania, Brazil, and China
Thompson Creek Mining Co.
Location of Plants served or currently serving: Idaho
World Minerals (Division of Imerys)
Location of Plants served or currently serving: California, Utah, Nevada, Washington, and Mexico