ST. LOUIS, June 18, 2012 /PRNewswire/ -- Arch Coal, Inc. (NYSE: ACI) today announced that Paul T. Hanrahan, 54, has been elected to its board of directors, effective June 12. Hanrahan will serve on the board's audit and nominating and corporate governance committees."We are very pleased to welcome Paul to our board," said John W. Eaves
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