Occupational exposures to fibers and quartz at 19 crushed stone mining and milling operations.
Kullman-GJ; Greife-AL; Costello-J; Hearl-FJ
Am J Ind Med 1995 May; 27(5):641-660
Occupational exposures to fibers and quartz at crushed stone mining and milling operations were examined via cross sectional exposure assessment. Exposures to respirable dust, total dust, crystalline silica (14808607), asbestos (1332214), and mineral fibers were measured at 19 crushed stone operations in the United States. A stratified sample of operations was randomly selected by rock type (granite, limestone, traprock, or sandstone). Mineral fibers were detected at several facilities; fibers included serpentine (12001295), tremolite (77536686), hornblende (12178426), olivine, and magnesite (546930). Asbestos fibers were found only at one traprock facility. All sample measurements were below the Mine Safety and Health Administration permissible exposure limits for fibers; two of ten samples, however, exceeded NIOSH recommended exposure limits. A variety of silicate mineral fibers were detected in traprock operations and at one granite operation. Crystalline silica was detected at 17 of the studied facilities; significant overexposures were measured at the majority of these crushed stone operations. Job exposure zones with the most frequent and highest overexposures to crystalline silica included mill operators, mill laborers, and truck drivers. The authors conclude that many crushed stone quarries and mills present a significant silicosis hazard as well as a potential lung cancer risk.
NIOSH-Author; Asbestos-fibers; Dust-exposure; Exposure-levels; Occupational-exposure; Mining-industry; Milling-industry; Industrial-hygiene; Respirable-dust; Stone-processing; Occupational-respiratory-disease; Silica-dusts; Mineral-dusts; Industrial-medicine;
Author Keywords: crystalline silica; quartz; crushed stone mining; fibers; asbestos; occupational exposure
Gregory J. Kullman, Environmental Investigations Branch, Division of Respiratory Disease Studies, NIOSH, Centers for Disease Control and Prevention, 1095 Willowdale Rd., Morgantown, WV 26505-2845
14808-60-7; 1332-21-4; 12001-29-5; 77536-68-6; 12178-42-6; 546-93-0
American Journal of Industrial Medicine