Upper Big Branch Mine Upper Big Branch Mine

Former Massey Energy CEO Don Blankenship, left, walks out of the Robert C. Byrd U.S. Courthouse on Nov. 24, 2015, after the jury deliberated for a fifth full day in his trial in Charleston, W.Va. Chris Tilley/AP hide caption

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Chris Tilley/AP

Federal prosecutors said Don Blankenship operated Massey Energy as a "lawless enterprise." He's seen here leaving a federal courthouse in Charleston, W.Va., on Nov. 17, when the jury began deliberations. Kara Lofton/West Virginia Public Broadcasting hide caption

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Kara Lofton/West Virginia Public Broadcasting