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Morbidity and mortality of vermiculite miners and millers exposed to tremolite-actinolite: Part I. Exposure estimates

Journal Article · · Am. J. Ind. Med.; (United States)
; ; ;
The vermiculite ore and concentrate of a mine and mill near Libby, Montana, was found to be contaminated with fibrous tremolite-actinolite. Of 599 fibers (length greater than 5 microns and width greater than 0.45 micron) counted in eight airborne membrane filter samples, 96% had an aspect ratio greater than 10 and 16% had an aspect ratio greater than 50. Additionally, 73% of the fibers were longer than 10 microns, 36% were longer than 20 microns, and 10% were longer than 40 microns. Estimates of exposure before 1964 in the dry mill were 168 fibers/cc for working areas, 182 fibers/cc for sweepers, 88 fibers/cc for skipping, and 13 fibers/cc for the quality control laboratory. In 1964-1971, exposure estimates for these areas were 33, 36, 17, and 3 fibers/cc, respectively. Estimates of exposures in the mine before 1971 ranged from 9-23 fibers/cc for drillers and were less than 2 fibers/cc for nondrilling jobs. All 8-hr TWA job exposure estimates decreased from 1972-1976, and from 1977-1982 were less than 1 fiber/cc.
Research Organization:
National Institute for Occupational Safety and Health, Morgantown, WV
OSTI ID:
6934800
Journal Information:
Am. J. Ind. Med.; (United States), Journal Name: Am. J. Ind. Med.; (United States) Vol. 1; ISSN AJIMD
Country of Publication:
United States
Language:
English

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