(a) No entry, slope, crosscut or panel shall be driven more than twenty (20) feet wide when roof bolts are the primary roof supports unless a greater distance is approved by the Advisory Council.

1. (1) The Advisory Council shall approve all mining plans and shall advise the Mining Commission of their decision.
2. (2) Diesel powered equipment shall be maintained according to manufacturers recommendations but shall be serviced at a minimum of each shift or eight hours, whichever is shorter.
3. (3) No diesel powered equipment shall be taken into any mine, slope or shaft that does not have a working and properly serviced scrubber and has been Bureau of Mines approved for use in gassy mines.
4. (4) Any time the scrubber does not remove the fumes or odors from the fuel, the diesel powered equipment must be removed from service.

(d) Coal dust, float coal dust, loose coal and other combustible materials shall not be permitted to accumulate in any mine.

1. (1) All crosscuts must be kept rock-dusted. All areas where coal has been extracted shall be rock-dusted to within forty (40) feet of the face.
2. (2) Rock-dust shall be applied to the floor, ribs and roof and shall be no less than sixty-five (65) percent of incombustible materials. Where methane is present the incombustible content shall be increased one (1) percent for each 0.1 percent of methane gas.
3. (3) The percentage of incombustible material in the returns shall be no less than eighty (80) percent. Where methane is present the incombustible content shall be increased 0.4 percent for each 0.1 percent of methane gas.
4. (4) Incombustible material requirements may not be applied if natural moisture can be squeezed from the accumulated dust.