Kentucky Revised Statutes Title XXVIII. Mines and Minerals § 352.060.Rock-dusting

(1) All mines, or parts of mines, or sections thereof, shall be rock-dusted if conditions are found to be dusty or hazardous, after proper inspection. In the event such conditions are found to exist, then the commissioner or his authorized representative shall require the necessary rock-dusting to make the mine, part of the mine, or section safe.

(2) In all mines, accumulations of excessive loose coal and fine dry coal dust shall be removed from the mine, and all operating sections kept thoroughly rock-dusted, and the dust on the mine floor allayed by methods approved by the commissioner, but in every mine, or in any part or section thereof, rock-dusting shall be applied to maintain at all times a minimum percentage of sixty-five percent (65%) of noncombustible matter to within forty (40) feet of the faces, including last open crosscuts, and under certain special conditions the department may require that places be rock-dusted to the faces, and that additional rock-dust be added.