A-Mark Precious Metals — founded in 1965 as A Mark Coin Company [1] — is a precious metals trading company. It was the first company allowed to make and sell coins from the metals recovered in the shipwreck of SS Gairsoppa.[1] As of 2018 it was a Fortune 500 company.[4] It offers gold, silver, platinum and palladium products for storage and delivery. This can be stored via bars, coins, grain and wafers.[5] Greg Manning Auctions Inc. bought a majority stake in A-Mark for $16 million in 2005.[6] Thereafter, the firm changed its name to Escala Group,[7] then to Spectrum Group International Inc.[8] In 2009, it purchased the remainder of A-Mark.[1] In 2014, Spectrum spun off A-Mark so that it could be publicly traded.

Alcoa Corporation (a portmanteau of Aluminum Company of America) is an American industrial corporation. It is the world’s eighth largest producer of aluminum,[2] with corporate headquarters in Pittsburgh, Pennsylvania.[3] Alcoa conducts operations in 10 countries. Alcoa is a major producer of primary aluminum, fabricated aluminum, and alumina combined, through its active and growing participation in all major aspects of the industry: technology, mining, refining, smelting, fabricating, and recycling.[4] In May 2007 Alcoa Inc. made a US$27 billion hostile takeover bid for Alcan in an attempt to form the world’s largest aluminum producer.[5] The bid was withdrawn when Alcan announced a friendly takeover by Rio Tinto in July 2007.[6] On November 1, 2016, Alcoa Inc. split into two new entities: Alcoa Corporation, which is engaged in the mining and manufacture of raw aluminium, and Arconic, which processes aluminum and other metals.[7] Alcoa moved its headquarters back to Pittsburgh effective September 1, 2017.[8] In October 2018, Alcoa announced plans to move from Pittsburgh’s North Shore to a more downtown Pittsburgh location.

Newmont Goldcorp Corporation, based in Greenwood Village, Colorado, USA, is an American mining company that traces its roots to the diversified holding company William Boyce Thompson established in 1916. Incorporated in 1921, it has active gold mines in Nevada, Australia, Ghana, Peru, and Suriname. Holdings include Santa Fe Gold, Battle Mountain Gold, Normandy Mining, Franco-Nevada Corp and Fronteer Gold. Newmont also has many joint venture relationships. Newmont is the world’s second-largest producer of gold. On January 14, 2019, Newmont successfully arranged a merger acquisition of Goldcorp, the world’s fourth-largest producer of gold, with the merged “Newmont Goldcorp” to be the world’s largest producer once the transaction is complete. In addition to gold, Newmont mines copper and silver. Newmont has approximately 24,660 employees and contractors worldwide, and is the only gold company in the Standard & Poor’s 500.

Kiewit Corporation is an employee-owned Fortune 500 contractor based in Omaha, Nebraska. Privately held, it is one of the largest construction and engineering organizations in North America. Recent projects have included several bridge retrofittings in the San Francisco Bay Area, Interstate H-3 project in Hawaii, rebuilding the spillway at Oroville Dam, and building the world’s largest geodesic dome at Henry Doorly Zoo in Omaha. Along with significant mining and off-shore operations, the company also contracts small grading (dirt moving) projects for residential or commercial development.