ABSTRACT. Silica and noise are highly prevalent occupational exposures in the stone processing industry. Monitoring for silica and noise are expensive tasks that may be especially difficult to perform in low-resource settings, but exposure awareness is vital for protecting worker health.
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Crystalline silica is a naturally occurring mineral found abundantly in the earth's crust. It occurs in several forms with quartz being the most common form. It is a component of sand, stone and rock and thus also a component of manmade materials such as concrete, brick, block, and mortar. In the stone industry, exposure to crystalline silica
produced during stone countertop fabrication and installation. On average, granite naturally contains 72% crystalline silica by weight [Blatt and Tracy 1997], and engineered quartz stone contains about 90% quartz grains by mass in a polymer matrix [Phillips et al., 2013]. An outbreak of silicosis was reported in Israel [Kramer
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Four silica categories are covered in this report—industrial sand and gravel, quartz crystals, special silica stone products, and tripoli. Most of the stone covered in the special silica stone products section is novaculite. The section on tripoli includes tripoli and other fine-grained, porous silica .
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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
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National Institute for Occupational Safety and Health (NIOSH) researchers conducted a field survey at a small manufacturer of stone monuments (mainly cemetery markers) to characterize workers' exposures to respirable crystalline silica and to evaluate exposure control methods.
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always" during their monitored shift (57.7% of stone workersand12.8%ofnon-stoneloaders),andtenwork-ers (evenly split between stone loaders and non-stone loaders) reported ringing or muffled hearing following theirshift. Silica Five silica samples were discarded based on post-calibrationflowratefailures,ninewerediscardeddueto