Cyprus-Amax, Miami Cyprus-Amax, Bagdad Golden Sunite Mine Phelps Dodge, Tyrone Cyprus-Amax Sierrita Magma Copper, San Manuel Indendence Mining Co., Elko Newmont Mining, NV Kennecott Copper-Salt Lake City, UT Asarco, Ray Mines Asarco, Southern Peru Copper Hycroft Resources Lewis Mine Magma Copper Pinto Valley Jim Walter Mines, Alb Peabody Mines, KY Consolidated Coal Company, KY Maple Leaf Mining Carlota Mine Texas Light Power Coal Cyprus Marion, III Cyprus Hazard, KY Cyprus King Mt., NC Cyprus Superior, WV Cyprus Fairdale, WV Cyprus Ark, KY Omar Mining Company Amax Coal Company-Wabash, IN FMC Wyoming Rocksprings, WY Kindill Mining-Kindill, IN Big River Electric Corp-Sebree, KY Indiana Michigan Power-Rockport, IN Drummond Company-Jasper, AL Stone Container Corp-Florence, SC Georgia-Pacific Cedar Springs, GA Zeigler Coal Company, WV US Steel Mining, WV

Ashland Coal Company, KY Arch Mineral Co, WV Tennessee Eastman, KY McCoy ElkHorn, KY Side Winder Coal Co, WV Chisholm Coal Co-KY Rhone-Poulene, Deer Park Waste Management, Chicago, IL Waste Management, Monroe LA BFI Houston, TX Andadarko, Liberal, KS Eco-Gas Dallas, TX Eco-Gas Houston, TX GSF-LA Fresh Kill Landfill, NY (Eco-Gas) BFI Landfill Fort Bend, TX Texas Farm Boy-Perryton, TX Rust Engineers-Greenvalley, IL National Seals-Monroe, LA National Seals-New Orleans, LA Owens Fiberglas-Owenston, KY BFI-Itasca, TX Asario Mine-Silver Bell Mine J.M. Huber Corp---Quincy, IL International Marble & Stone Co-Surrey BC, Canada Industrial Fillers Ltd-Montreal, Canada Georgia Marble Company—Kennesaw, GA Genstar Stone Products Company-Hunt Valley, MD Franklin Industrial Minerals-Nashville, TN Columbia River Carbonates-Woodland, WA Polar Minerals Inc.-Cleveland, OH Químicos y Minerales de Colombia, S.A., Barranquilla, Colombia Constructora lnmobiliaria de Monclova, S.A México Grupo Vic S.A. de C.V. Monclova, México