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Health hazard evaluation report: HETA-88-104-2207, ASARCO - Troy Unit Mine, Troy, Montana.
Morgantown, WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 88-104-2207, 1992 Apr; :1-48
In response to a request from the United Mine Workers of America, an investigation was made of possible exposures to diesel exhaust, silica (14808607) and noise at the ASARCO Troy Unit Mine (SIC-1044), Troy, Montana. This silver mine was also a significant copper producer. Approximately 314 persons were employed in two basic operations of mining and ore concentration. The ore was mined by the room and pillar method. Extraction calls for drilling, blasting, scaling and roof bolting, mucking and hauling. Exposures to nitrogen-dioxide (10102440) ranged from 0.16 to 4.61 parts per million (ppm) some of which were in excess of the recommended NIOSH limit of 1ppm. Coal-tar-pitch volatiles ranged in concentration from to 3.99mg/m3 with a mean concentration of 1.60mg/m3. Respirable dust concentrations ranged from 0.26 to 16.74mg/m3 with a mean of 2.24mg/m3. The mean quartz content of surface dust samples was 24% and of underground samples was 7%. Noise exposures ranged from 65.5 to 103.8 decibels-A for the 8 hour time weighted average samples. Of the 22 personal dosimeter readings obtained underground, 21 exceeded the limits as did six of the 19 readings taken on the surface. The authors conclude that a health hazard existed due to exposures to respirable silica, noise and diesel combustion products. The authors recommend specific measures to reduce the potential hazardous exposures and enhance the company's medical surveillance program.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-88-104-2207; Region-8; Hazard-Confirmed; Mining-industry; Underground-miners; Mineral-dusts; Airborne-dusts; Air-quality-monitoring; Noise-exposure; Occupational-exposure; Diesel-emissions;
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