91D3On Mining LLC, 3611 Rickshire Dr, Cincinnati, OH 45248, US

Martin Marietta Materials is one of the leading producers of construction aggregates for the construction of highways and other infrastructure projects. It serves the domestic, commercial and residential construction industries. The company has a network of more than 280 quarries, distribution yards and plants in the Bahamas and the Caribbean Islands, as well as in Canada and over 25 U.S. states. Martin Marietta Materials produces magnesia-based chemicals used in industrial, agricultural and environmental applications. It also offers dolomitic lime and structural composite products to the steel industry. The company serves residents in Ohio, Michigan and North Carolina. Martin Marietta Materials has operates in nearly 30 countries worldwide and is comprised of approximately 5,300 employees.