Still wearing their headlamps outside the confines of a coal mine, these two men were seated on a rail pull-car used to pull a string of coal bins, which would carry raw ore up, and out of the subterranean mine shafts. One of the men appears to be an industrial hygienist, for he was carrying what appeared to be an air-quality measuring device. The seated miner was wearing protective knee pads, which he'd need when maneauvering around in a crouched position in the small spaces inside the mine shaft. Looking at the coal dust pattern on the seated miner's face, it appeared that he hadn't been wearing a protective breathing mask. Due to the inescapable presence of airborne coal dust in the small confines of a mine, miners are predisposed to the long-term negative health effects of this profession such as 'black lung disease', or 'coal-workers' pneumoconiosis' (CWP). See PHIL 9551 for another view of these men.
CDC/ Barbara Jenkins, NIOSH
November 26, 2012
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