Six miners were killed and at least 21 unaccounted for Monday in an explosion at an underground coal mine, the state mining director said. Ron Wooten said the blast was reported around 3 p.m. at Massey Energy Co.'s Upper Big Branch mine in Raleigh County, about 30 miles south of Charleston. The company did not provide details on the extent of the damage or if other miners had been rescued. A Boone County ambulance dispatcher also said he has the same number of fatalities and missing miners. The mine is operated by Massey subsidiary Performance Coal Co. It has caches of extra oxygen along emergency escape routes and airtight refuge chambers designed to provide enough air to keep miners alive for four days if they can't make their way out, according to Randy Harris, an engineering consultant who oversees installation of high-tech gear. Five highly trained mine rescue teams from Conso Energy and Massey were on the scene as well as part of the state Office of Miners' Health Safety and Training team, MSHA spokeswoman Amy Louviere said. The large mine produced 1.2 million tons of coal in 2009, according to the Mine Safety and Health Administration, and has about 200 employees, most of whom work underground. They would not have all been working the same shift. added by: Omnomynous
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