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Health hazard evaluation report: HETA-88-031-1894, Camp Bird Ventures, Ouray, Colorado.
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 88-031-1894, 1988 May; :1-17
In response to a request from Camp Bird Ventures (SIC-1041), Ouray, Colorado, an evaluation was made of possible hazardous working conditions with particular attention given to lead (7439921) exposures. Camp Bird Ventures was engaged in underground mining for gold and silver; fire assays were performed on ore samples. Two employees had been found to have excessive blood lead levels. Personal protective equipment worn by employees engaged in fire assay work in the furnace and storage rooms included disposable full body suits, boot covers, and half face respirators. One worker had a full beard, which would interfere with the respirator seal and another had a torn protective suit, which would allow entry of lead dust. Time weighted average (8 hour) lead concentrations in personal air samples were 113 and 40 micrograms per cubic meter (microg/m3) for the assayer and scale operator, respectively. The OSHA permissible exposure limit for lead was 50microg/m3 as an 8 hour time weighted average. Area air concentrations of lead were 100microg/m3 in the furnace room, 58microg/m3 in the storage room, and 46microg/m3 in the office. The author concludes that a potential health hazard existed from employee exposure to lead in the fire assay operations. The author makes recommendations concerning air monitoring, mechanical ventilation, respiratory protection, personal protective clothing hygiene facilities and practices, housekeeping, and medical monitoring.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-88-031-1894; Region-8; Hazard-Confirmed; Dust-inhalation; Mining-industry; Heavy-metals; Lead-poisoning; Author Keywords: gold ores; fire assay; gold assay; lead; blood lead; litharge; ventilation
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division