| http://www.w3.org/ns/prov#value | - Investigators suspect methane gas and excessive coal dust caused the massive April 5 blast at Massey's Upper Big Branch mine.The purpose of these inspections is to provide assurance that no imminent dangers, explosions, hazards or other serious health or safety conditions and practices are present at these mines, MSHA director Joe Main said.Rick Abraham, whose mine was on the inspection list, de
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