The United States hasn't built an oil refinery on a new site in more than 30 years, but a pair of projects eyeing out-of-the way corners of South Dakota and Arizona are slowly working their way up to the big leagues.

The journeyman is Arizona Clean Fuels Yuma, a $3 billion, 150,000-barrel-a-day refinery first pitched for the middle of the Arizona desert more than a decade ago.

Source: Associated Press

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