San Manuel is a census-designated place in Pinal County, Arizona, United States. The population was 3,551 at the 2010 census. San Manuel was built in 1953 by Del E. Webb Construction Company as a company town to serve the then-new San Manuel copper mine, mill and smelter complex. In 1955 the San Manuel Arizona Railroad was built to connect with the …San Manuel is a census-designated place in Pinal County, Arizona, United States. The population was 3,551 at the 2010 census. San Manuel was built in 1953 by Del E. Webb Construction Company as a company town to serve the then-new San Manuel copper mine, mill and smelter complex. In 1955 the San Manuel Arizona Railroad was built to connect with the Copper Basin Railway at Hayden. When copper prices fell in the late 1990s, BHP, the owner of the mine and smelter complex shuttered both operations in June 1999. The closing saw 2,500 people lose their jobs. The mine and smelter were permanently closed in 2003.
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