C. Corwin Bromley

MarkWest Energy Partners LP engages in the business of gathering, processing and transportation of natural gas; the transportation, fractionation, storage and marketing of natural gas liquids; and the gathering and transportation of crude oil. It operates through four segments: Marcellus, Utica, Northeast and Southwest. The Southwest segment includes the operations of processing facilities in Corpus Christi, Texas. The Northeast segment assets include the Kenova, Boldman, Cobb, Kermit and the Langley natural gas processing complexes, NGL pipeline and Siloam NGL fractionation facility. The Marcellus segment includes gathering, processing and fractionation infrastructure in the liquids-rich area of the Marcellus Shale The Utica segment provides fractionation services. The company was founded in January 2002 and is headquartered in Denver, CO.

MarkWest Hydrocarbon LLC provides natural gas processing services. It also provides transportation, fractionation, and storage of natural gas liquids and transportation of crude oil. The company was founded by John M. Fox in April 1998 and is headquartered in Denver, CO.

Part of Marathon Petroleum Corp., MarkWest Energy GP LLC is a company that provides oil and gas field services not elsewhere classified. The company is based in Englewood, CO. The company was founded by John C. Mollenkopf.

Foundation Coal Holdings, Inc. engages in exploration of coal. It owns and operates mines in the central & northern Appalachia and the powder river basin. The company was founded in 1974 and is headquartered in Linthicum Heights, MD.

Part of Freeport-McMoRan, Inc., Cyprus Amax Minerals Co. is a company that engages in the production of molybdenum, lithium, copper, and coals. The company is based in Phoenix, AZ. Cyprus Amax Minerals was acquired by Phelps Dodge Corp. on December 02, 1999 for $1,816.19 million.

MPLX GP LLC owns, operates, develops and acquires pipelines for petroleum and energy industries. The company is headquartered in Findlay, OH.