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Silica Refining And Mining

Mining unions call for a new msha silica standard ,jun 19, 2019 In addition, silica causes both lung cancer and silicosis, another deadly dust disease, which has not been eliminated in metal and mineral mines. osha set a new silica standard in 2016, cutting the permissible exposure limit in half, but msha has yet to follow suit. black lung afflicts thousands of coal miners, roberts said.

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