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Silica is the name given to a group of minerals composed of silicon and oxygen, the two most abundant elements in the earth's crust. Silica is found commonly in the crystalline state and rarely in an amorphous state. It is composed of one atom of silicon and two atoms of oxygen resulting in the chemical formula SiO2.

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mining, mineral processing, and surface mining, respectively. Finally, it must be stressed that after control technologies are implemented, the ultimate success of ongoing protection for workers is dependent upon continued maintenance of these controls.

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EPA promulgated the Mineral Mining and Processing Effluent Guidelines and Standards (40 CFR Part 436) in 1975, and amended the regulation in 1976, 1977, 1978, and 1979. The regulation covers wastewater discharges from mine drainage, mineral processing operations and stormwater runoff.

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Summary of the Silica Sand Processing Plant Equipment. In general most silica sands can be beneficiated to acceptable specifications by the flowsheet illustrated. Reagent cost for flotation is low, being in the order of 5 to 10 cents per ton of sand treated.

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What is Silica?

What is Silica? • Introduction: • Geology and occurrence of industrial silica • Physical and chemical properties • Processing technologies • Silica CAS-Numbers • Crystalline Silica registry numbers Introduction Silica is the name given to a group of minerals composed of silicon and oxygen, the two

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By Ronald F. Balazik - minerals.usgs.gov

polishing stones, which accounted for most or all of imported silica stone products in 1995. A portion of the finished products that were imported may have been made from crude novaculite produced within the United States and exported for processing. Outlook OTHER SOURCES OF INFORMATION U.S. Geological Survey Publications