| http://www.w3.org/ns/prov#value | - In response, commenters questioned what MSHA meant by the term ``effectively.'' In the September 2010 PIB, MSHA emphasized that mine operators are responsible for applying rock dust in areas of underground bituminous coal mines to inert coal and float coal dust, loose coal, and other combustible materials to comply with the ETS. Miners are exposed to grave hazards in these underground mines.
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