Almatis
Alteo
AluChem, Inc.
Calucem
CMC Cometals
Electro Abrasives Corp.
FX Minerals, Inc.
Gorka Corp
Great Lakes Minerals
Imerys Refractory Minerals
Kerneos, Inc.
Kyanite Mining Corporation
Refractory Minerals Co., Inc.
Ribbon Technology Corporation
Sintertec
U.S. Electrofused Minerals, Inc.
US Three Stars Specialty Alumina
Washington Mills Electro Minerals Corp.
