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Health hazard evaluation report: MHETA-81-108-9004, Climax Molybdenum Company, Climax, Colorado.
Morgantown, WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, MHETA-81-108-9004, 1982 Nov; :1-19
Employee exposure to diesel emissions at the Climax Molybdenum Company Mine (SIC-1061) in Climax, Colorado, was investigated. The study was requested by the Oil, Chemical and Atomic Workers Union and was performed on September 23 and 24, 1981. The mine employed about 1200 people in underground operations. Environmental air samples were taken for nitrogen-dioxide (10102440), sulfur-dioxide (7446095), polynuclear aromatic compounds, formaldehyde (50000), respirable particulates and free silica (14808607), carbon-monoxide (630080), and carbon-dioxide (124389). Seventy four percent of the environmental samples collected for diesel particulates contained an average of 0.3 percent polynuclear aromatic compounds by weight as the cyclohexane soluble fraction. Thirty six percent of the free silica samples equaled or exceeded the NIOSH recommended limit of million of nitrogen-dioxide was present, although long term exposures may have exceeded the NIOSH recommended limit of 1 part per million. The remaining substances were either not detected or were well below the recommended criteria. The author concludes that the potential for a health hazard exists from exposure to free silica and polynuclear compounds.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; Region-8; MHETA-81-108-9004; Hazards-Confirmed; Underground-mining; Mining-industry; Miners; Organic-compounds; Polycyclic-aromatic-hydrocarbons; Air-sampling; Metal-oxides; Molybdenum-compounds
10102-44-0; 7446-09-5; 50-00-0; 14808-60-7; 630-08-0; 124-38-9
Field Studies; Hazard Evaluation and Technical Assistance
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division