FILE - In an April 5, 2010 file photo, West Virginia State 

FILE - In an April 5, 2010 file photo, West Virginia State Police direct traffic at the entrance to Massey Energy's Upper Big Branch Coal Mine in Montcoal, W.Va.  An independent investigation concludes the West Virginia coal mine explosion that killed 29 men last year was the result of safety failings by owner Masey Energy Co and rejects the company’s argument that a sudden gas buildup caused the deadliest U.S. coalfield disaster since 1970. The report released Thursday, May 19, 2011 and commissioned by the state’s former governor said Masey violated basic safety practices, including not ventilating the tunnels enough. It supported the federal government's theory that methane gas mixed with huge volumes of explosive coal dust turned a small fireball into a preventable earth-shattering explosion.  (AP Photo/Jeff Gentner, File)
Associated Press
FILE - In an April 5, 2010 file photo, West Virginia State Police direct traffic at the entrance to Massey Energy's Upper Big Branch Coal Mine in Montcoal, W.Va. An independent investigation concludes the West Virginia coal mine explosion that killed 29 men last year was the result of safety failings by owner Masey Energy Co and rejects the company’s argument that a sudden gas buildup caused the deadliest U.S. coalfield disaster since 1970. The report released Thursday, May 19, 2011 and commissioned by the state’s former governor said Masey violated basic safety practices, including not ventilating the tunnels enough. It supported the federal government's theory that methane gas mixed with huge volumes of explosive coal dust turned a small fireball into a preventable earth-shattering explosion.
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