Assessment of respirable quartz dust exposures at roof bolters in underground coal mining.
J Mine Vent Soc S Afr 2003 Apr/Jun; 56(2):50-54
Roof bolter occupations in underground coal mines have long been susceptible to overexposures to respirable quartz. Data gathered from a series of underground studies showed that high exposures to respirable quartz dust arose from infrequent maintenance of the vacuum dust collection system and operation of the roof bolter downwind of the continuous mining machine. Data boxes and filters were not routinely cleaned, which allowed dust to accumulate and eventually bypass the final filters. This not only increased dust levels around the roof bolter, but contaminated the intake airway of the continuous mining machine working downwind. High quartz dust levels in the intake airway of the roof bolter were measured when working downwind of the mining machine. Dust from the mining process flowed downwind and increased respirable quartz dust levels in the intake of the roof bolter.
Respirable-dust; Dusts; Quartz-dust; Dust-exposure; Underground-mining; Coal-mining; Mine-workers; Underground-miners; Coal-miners; Dust-sampling; Dust-samplers; Sampling; Samplers; Filters; Dust-collection; Dust-collectors
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Journal of the Mine Ventilation Society of South Africa