DOE Selects Projects to Reduce Mercury Emissions from Coal-Fired Power Plants Focus is on Cost-Effective Technology to Achieve 90 Percent Mercury Removal

DOE Selects Projects to Reduce Mercury Emissions from Coal-Fired Power Plants Focus is on Cost-Effective Technology to Achieve 90 Percent Mercury Removal

BALTIMORE, Maryland - March 8, 2006 - Martin Marietta Magnesia Specialties, LLC will participate in an industry group led by CONSOL Energy to field test the Low Temperature Mercury Control (LTMC) method at PPL electrical generating plant in Martins Creek, Pennsylvania. The LTMC process, which cools flue gas temperatures and adsorbs mercury to the carbon in the fly ash, will be examined to determine the system's mercury removal performance and assess overall impacts. The project is to begin later this year.

Magnesia Specialties manufactures an extensive range of magnesia-based products used in industrial, environmental, water treatment, flame retardant, plastic and rubber, specialty and agricultural applications.

Martin Marietta Magnesia Specialties, LLC, a subsidiary of Raleigh, North Carolina based, Martin Marietta Materials, Inc. (NYSE:MLM), is a leading global producer of magnesium oxide and magnesium hydroxide products.

For more information on Martin Marietta Magnesia Specialties' products and services, visit www.magspecialties.com.