(a) Coal dust shall not be allowed to accumulate excessively along conveyor lines, roadways, at loading points or at underground tipples, but shall be loaded and sent out of the mines. Coal dust in dangerous quantities in abandoned areas shall, where practicable be rendered inert.
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(b) Where mining operations raise an excessive amount of dust into the air currents, water or water with a wetting agent added to it or other effective methods shall be used to allay such dust at its source.