Courtesy of the Mine Safety and Health Administration

Relatives of Dean Jones, one of the 29 miners killed in the April 5 explosion of the Upper Big Branch mine, gathered for a vigil on April 10 with other families of the blast victims. From left are Julie Jones, Cassie Jones and Susan England. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

West Virginia State Police direct traffic at the entrance to Massey Energy's Upper Big Branch coal mine in Montcoal, W.Va., on April 5. Jeff Gentner/AP hide caption

itoggle caption Jeff Gentner/AP

Massey Energy decided to close its Freedom Mine in Kentucky after it was targeted by federal regulators for the toughest enforcement action ever. Howard Berkes/NPR hide caption

itoggle caption Howard Berkes/NPR