Ohio Rev. Code § 1563.25: Accumulation of combustible materials prohibited.

Coal dust, loose coal, and other combustible materials shall not be permitted to accumulate in any active workings. Where mining operations raise an excessive amount of dust into the air, water or water with a wetting agent added to it, or other effective methods, shall be used to allay such dust at its source.

No operator of a mine shall refuse or neglect to comply with this section.