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silica mining effect onthe enviorment coal crusher net

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Description:Sep 28, 2010018332Enhanced Coal Workers’ Health Surveillance Program • SMINER Bill proposed reduced dust standards – 1.0 mgm 3 coal mine dust standard – 50 gm 3 silica dust standard • MSHA has placed coal dust on regulatory agenda for 2010 and silica dust on regulatory agenda for 2011 • As mining becomes more efficient and production increases, the

SourceAccess Heavy Industries Co., Ltd. China(Mainland)

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