Martin Marietta Materials is a natural resource-based building materials company. It supplies aggregates, such as crushed stone, sand, and gravel for use in agricultural, utility, and environmental applications and as railroad ballast. The company also provides cement and downstream products, including ready mixed concrete, asphalt, and paving services for infrastructure, nonresidential, and residential construction projects. In addition, Martin Marietta produces magnesia-based chemical products for industrial, agricultural and environmental applications, as well as dolomitic lime sold primarily to customers in the steel and mining industries.