| http://www.w3.org/ns/prov#value | - The Upper Big Branch mine was cited for more than 600 violations in the year and a half leading up to the accident, including problems with its methane ventilation system, dust accumulation and other issues.Tony Oppegard, a mine safety advocate and former regulator who practices law in Kentucky, said prosecutors would look at whether Massey employees knew of hazardous conditions and decided not to
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