Acetylene & Ethylene Fuel Mine Fire - 4/29/2010
Toxic gases are still keeping investigators out of the West Virginia coal mine more than three weeks since 29 men died in an explosion.
Federal officials believe there is some kind of fire or other heat source within the Upper Big Branch mine. They cite signs of acetylene and ethylene.
Mine owner Massey Energy has already pumped 7 million cubic feet of nitrogen into the underground mine to suffocate any fire.
Investigators are searching for a cause behind the April 5 blast, the nation's worst coal mine disaster in 40 years.
Read more here.
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