Safety inspectors concluded as recently as last month thatconditions at Massey Energy Co.'s Upper Big Branch mine posedsubstantial and significant risks to miner well-being before aMonday explosion killed at least 12 miners and trapped nearly 10.
In March alone, U.S. Mine Safety and Health Administrationofficials cited the mine, which is owned by Massey subsidiaryPerformance Coal Co., for failing to control dust; improperlyplanning to ventilate the mine of dust and the combustible gasmethane; inadequate protection from roof falls; failing to maintainproper escapeways; and allowing the accumulation of combustiblematerials.
Since 1995, there have been more than 3,000 …
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