Knife River Corporation
Knife River Corporation, together with its subsidiaries, provides aggregates-led construction materials and contracting services in the United States. It operates through Pacific, Northwest, Mountain, Central, and Energy Services segments. The company mines, processes, and sells construction aggregates, including crushed stone and sand, and gravel; and produces and sells asphalt and ready-mix concrete. It also provides contracting service, such as heavy-civil construction, asphalt and concrete paving, and site development and grading. In addition, the company sells cement, merchandise, and other building materials and related services; and produces and supplies liquid asphalt for use in asphalt road construction. The company sells its construction materials to public and private-sector customers comprising federal, state, and municipal governments; industrial, commercial, and residential developers, as well as other private parties; and provides its contracting services to public-sector customers for the development and servicing of highways, local roads, bridges, and other public-infrastructure projects. Knife River Corporation was founded in 1917 and is headquartered in Bismarck, North Dakota.
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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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