Analysis of Quartz Exposure Data Obtained from Underground and Surface Coal Mining Operations
نویسنده
چکیده
been compiled and analyzed to characterize current occupational expo~urcs to quartz: to determine if the quartz percentages of samples collected for different occupations have changed during the period 1985 through 1992; and to study the intranline variability associated \'vid1 quartz sample percentages of selected occupations. Analysis of the occupational data shows that regardless of the type of coal extraction process used, there are a substantial number of occupational samples that contain greater than 5 percent quartz and show quartz exposures that exceed 100 /lg/m-1 • In underground mining operations, apprm.;mately 30 percent of the samples collected at the continuous-miner operator and continuous-miner helper occupations on
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