8/11/2023 0 Comments Oem rcmdThe mineralogy and particle size distribution of RCMD vary both within a single mine and from mine to mine depending on the local geology, rock dusting practices, mining methods, and the use of engineering controls. RCMD is generated by a number of mining activities including mining coal, loading and transporting coal, applying rock dust (i.e., a dust composed mostly of finely milled limestone), and most importantly for potential quartz exposure, mining or drilling into geologic strata overlying the coal seam or interbedded with the coal seam. RCMD is most commonly comprised of micron and submicron particles of coal, quartz, pyrite, calcite, dolomite, clay minerals, and diesel particulate matter. The term respirable coal mine dust or “RCMD” refers to the part of coal mine dust that is composed of these small particles. Some airborne dust particles are small enough to remain suspended in the air for long periods of time and can be inhaled deep into the lung.
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