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Dec 08, 2018· In Tanzania, respirable silica exposures exceeded occupational limits for all tasks monitored with an average exposure of 16.85 mg m −3 for underground mining with power drilling that was 337-fold greater than the US exposure limit (PEL) and 0.19 mg m −3 for dry processing operations or 4-fold greater than the PEL.
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decades. There is no effective treatment even after cessation of exposure. Hazardous silica dust is released into the air from drilling, chipping, cutting, grinding, sanding, polishing or crushing and screening natural rock and ore as in granite, sandstone, slate quarries and in mining.
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Sep 28, 2010· Silica Dust • 2 nd most common element in the earth's crust (27.7%) • Found in many types of rock and ore • Respirable-sized silica particles liberated during drilling, crushing, loading, and dumping Silica particles embedded in limestone THIN SECTION 200x MAGNIFICATION
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