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A Risk Assessment for Exposure to Grunerite Asbestos (Amosite) in an Iron Ore Mine
Pages 3412-3419

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From page 3412...
... In 1955, Sir Richard Doll published a comprehensive epidemiological survey of employees of chrysotile asbestos textile plant in Rochdale, England (3~. Individuals employed for 20 or more years experienced lung cancer ~14 times more frequently than the general population (11 cases observed/0.8 expected)
From page 3413...
... The patterns of mesothelioma depending on asbestos fiber type are strikingly different in that a high mortality for mesothelioma is never found among individuals exposed only to chrysotile asbestos (5) , although from time to time, individuals present with pleural mesothelioma and high concentrations of chrysotile are found to be present in the pulmonary tissue by lung content analysis (64.
From page 3414...
... of Air sample samples Area During mining During blasting Total Personal Drilling Shovel Production truck Track dozer Blast Unidentified Sample Total Total samples analyzed Field Laboratory Unspecified Not analyzed Total samples taken TValues given as arithmetic mean + SD the fiber concentrations a log normal. "Controls, values are fibers per mm2 of filter area.
From page 3415...
... United States regulations concerning occupational exposure to asbestos fiber 2.0 0.2 0.1 Regulatory agency MSHA OSHA* oSHAt Standard for an 8-hour time-weighted average, asbestos fibers per ml Excursion level, fibers per ml =10t None Allowed None Allowed All data refer to all fibers-5 ,um.
From page 3416...
... Comparison of Occupational Cohorts Exposed to Iron Ore and Asbestos. The American and Canadian asbestos insulation workers are generally thought to have had exposure to the three principal commercial asbestos fiber types grunerite asbestos, crocidolite, and chrysotile (12~.
From page 3417...
... Of the 43 cases in which sufficient tissue was available for fiber analysis, grunerite asbestos was present at a 20-fold higher concentration than the three other commercial asbestos fiber types. In both the lung cancer and mesothelioma cases, ~97% of the total fiber burden was grunerite asbestos (Table 7~.
From page 3418...
... Lifetime risk for two mining scenarios in the iron ore mine compared to selected relative risks* Activity Lifetime risk per lOO,000 Iron Ore Mining Scenario I Nonsmokers Smokers Scenario II Nonsmokers Smokers Lung cancer heavy cigarette smoking US motor vehicles, all deaths Drowning deaths, nontransport caused Upper limit of risk EPA claims to regulate *
From page 3419...
... Airborne Asbestos Health Assessment Update.


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