摘要: Worker exposures to free silica (7631869), radon (10043922) daughters, arsenic (7440382), and asbestos (1332214) fibers were determined at the Homestake Mining Company (SIC-1041) in Lead, South Dakota from July 12 to 23, 1977. The... 展开 Worker exposures to free silica (7631869), radon (10043922) daughters, arsenic (7440382), and asbestos (1332214) fibers were determined at the Homestake Mining Company (SIC-1041) in Lead, South Dakota from July 12 to 23, 1977. The mining operation was being investigated due to an elevated incidence of deaths from malignant and nonmalignant respiratory diseases in the mining population. About 968 employees worked in the underground operations on 35 levels from 1700 to 8000 feet. Approximately 170 employees representing 90 percent of the job titles were sampled for an entire work shift using personal filters. Data for free silica was used from a survey conducted in 1976 for the mine. Midget impinger samples were collected for dust. Samples were collected from 448 miners during an entire work shift with each crew over a two week period. Work practices were documented. The authors conclude that mean exposures for free silica, radon daughters, arsenic, and asbestos fibers are within OSHA standards for most job classifications. They suggest that the potentiating effect of the contaminants could predispose some workers to respiratory diseases. They recommend a continuing education program for job hazards, maintenance procedures, and cleanup methods, and to ensure that they understand how to use respiratory protective equipment and protective clothing. They suggest sealants to contain radioactive contamination from rock, and reduction of dust concentrations. 收起