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· First listed in the Sixth Annual Report on Carcinogens ... nonmining industries and 722,708 workers in mining industries potentially were exposed to respirable crystalline silica in 1986. Potential exposure to respirable crystalline silica has been studied in metal and nonmetal mining and milling operations. Workers in sandstone, clay, shale, and miscellaneous nonmetallic mineral mills had ...
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The Environmental Protection Agency describes sand and gravel as granulated material that results "from the natural disintegration of rock or stone." The deposits of these materials are generally near the surface of the Earth and in wet areas. The locations are suitable for open pit mining and dredging ...
Frac sand mining boomed in Wisconsin between 2010 and 2015 with companies from around the United States building mines, processing plants and rail loading facilities in hopes of capitalizing on the state''s reserves of silica sand the industry calls "Northern White." It was prized for its strength and roundness, and deposits in places like Chippewa, Barron and Trempealeau counties were easy to ...
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In 2001 June, Xinhai company completed the South Korean glass Fuchang silica sand project;In October 2001, Xinhai obtained the right of import and export In May 2002, Xinhai obtained the titles of "provincial hightech enterprise" and "trustworthy enterprise" of Shandong Province.
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Applications for silica differ depending on the particle size, which is divided into three general size categories: lump silica, – 15 cm; sand, 75 μm – 3 mm; and flour, < 75 μm. Lump silica is used as flux for smelting operations, in silicon and ferrosilicon alloys, and for silica brick. This size fraction is not of concern for health ...
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The chief of a Manitoba First Nation adjacent to a future frack sand mine says his community''s leadership doesn''t share environmental concerns raised by others about the development.