Hospital backs Hyperion plan Argus Leader Staff Reports Mercy Medical Center of Sioux City has endorsed the Hyperion Energy plan to build an oil refinery north of Elk Point. The statement recently was filed with the South Dakota Department of Environment and Natural Resources. The refinery project goes to a public vote June 3 in Union County. It then would need about two years to clear hurdles in the permitting process. Construction could begin in 2010. |

