Martin Marietta Materials
Martin Marietta Materials, Inc., a natural resource-based building materials company, supplies aggregates and heavy-side building materials to the construction industry in the United States and internationally. It offers crushed stone, sand, and gravel products; ready mixed concrete and asphalt; paving products and services; and Portland and specialty cement for use in the infrastructure projects, and nonresidential and residential construction markets, as well as in the railroad, agricultural, utility, and environmental industries. The company also produces magnesia-based chemicals products, dolomitic lime primarily to customers for steel production and soil stabilization. Its chemical products are used in flame retardants, wastewater treatment, pulp and paper production, and other environmental applications. The company was founded in 1939 and is headquartered in Raleigh, North Carolina.
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Southern Copper Corporation engages in mining, exploring, smelting, and refining copper and other minerals in Peru, Mexico, Argentina, Ecuador, and Chile. The company is involved in the mining, milling, and flotation of copper ore to produce copper and molybdenum concentrates; smelting of copper concentrates to produce blister and anode copper; refining of anode copper to produce copper cathodes; production of molybdenum concentrate and sulfuric acid; production of refined silver, gold, and other materials; and mining and processing of copper, molybdenum, zinc, silver, gold and lead. It operates the Toquepala and Cuajone open-pit mines, and smelter and refinery in Peru; and La Caridad, an open-pit copper mine, as well as copper ore concentrator, SX-EW plant, smelter, refinery, and rod plant in Mexico. The company also operates Buenavista, an open-pit copper mine, as well as copper concentrators and operating SX-EW plants in Mexico. In addition, it operates underground mines that produce zinc, lead, copper, silver, and gold; coal mine; and zinc refinery. The company has interests in 156,818 hectares and 502,688 hectares of concessions in Peru and Mexico; and 168,200 hectares and 28,453 hectares of exploration concessions in Argentina and Chile. Southern Copper Corporation was incorporated in 1952 and is based in Phoenix, Arizona. Southern Copper Corporation is a subsidiary of Americas Mining Corporation.
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