Environmental Assessment of the Homestake Goldmine.
Industrial Hygiene for Mining and Tunneling 1978 Nov:36-44
Working conditions at the Homestake Goldmine in South Dakota were surveyed in 1977. Throughout a 2 week period, samples of air and ore were analyzed. Time weighted average (TWA) exposures derived from samples on different ledges within the mine ranged from 0.5 to 2.4 million particles per cubic foot. These dust concentrations were similar to those measured in 1953. Only 1 of 53 composite samples analyzed for arsenic (7440382) exceeded the OSHA standard of 10 micrograms per cubic meter. The TWA was 2.0 micrograms per cubic meter. Radon (10043922) daughter concentrations were below the Mine Enforcement and Safety Administration (MESA) standard of 4 working level months per year. Asbestos (1332214) concentrations did not exceed the MESA TWA standard of 2 fibers per cubic centimeter, but most samples exceeded the NIOSH standard of 0.1 fibers per cubic centimeter. Trace metals, free silica (7631869), and arsenic were not detectable or were found in only negligible amounts in three composite ore samples. The authors note that a retrospective mortality study of workers in this mine is underway.
Mine-workers; Health-surveys; Dust-analysis; Radioactive-materials; Asbestos-dusts; Industrial-hygiene; Air-sampling;
7440-38-2; 10043-92-2; 1332-21-4; 7631-86-9;
Industrial Hygiene for Mining and Tunneling