ASARCO Incorporated of New York, and Doe Run Company of St.
Louis are the major players.
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The acronym ASARCO stands the American Smelting and Refining
Company. ASARCO is a mining, smelting, and refining company based
in Tucson, Arizona, mainly mines and processes copper.
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In the United States, only ASARCO, Incorporated produces primary
bismuth, while a number of smaller firms produce secondary bismuth
product mainly from scrap.
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ASARCO's Windsor Avenue facility operated in Columbus from 1971
until 1986
http://www.epa.ohio.gov/portals/47/nr/2010/january/asarco.pdf
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In the end, two mergers were inked: Phelps/Dodge with Cyprus
Amax, and Asarco with Grupo Mexico.