Face dust levels at deep-cut underground coal mines.
Potts-JD; Reed-WR; Colinet-JF
2011 SME Annual Meeting, February 27 - March 2, Denver, Colorado, Preprint 11-072. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2011 Feb; :1-11
Dust surveys were conducted at six underground coal mines to determine if deep-cutting practices expose face workers to higher levels of respirable dust. The surveyed mines were able to successfully mine deep cuts without significantly increasing the dust exposures of face workers. For exhausting face ventilation, field data indicate that scrubber airflow is the most important factor for controlling dust. Data collected for this study indicate that 20-mesh screens should be cleaned for every 40 ft of advance because 22% of the deep cuts surveyed for this study experienced a 20% to 35% decrease in scrubber airflow over the course of the cut. For blowing face ventilation, field data and past research indicate that dust control is aided by maintaining a proper curtain-to-scrubber airflow ratio of 1.0 (measured before scrubber activation) as well as a curtain setback distance that allows the miner operator to stand at the mouth of the curtain for the entire cut. Dust levels on the bolting faces did not appear to be affected by the longer cycles associated with deep-cut mining when good ventilation practices were used
Mining-industry; Underground-mining; Coal-mining; Coal-dust; Respirable-dust; Dust-exposure; Dust-control; Dust-control-equipment
2011 SME Annual Meeting, February 27 - March 2, Denver, Colorado, Preprint 11-072