Section 147(3) in The Coal Mines Regulations, 2011
(3)Every part of mine which is not naturally wet throughout or which is not isolated by explosion-proof stoppings shall be treated -(i)with fine incombustible dust in such manner and at such intervals as will ensure that the dust on the floor, roof and sides and any support or structure shall always consist of a mixture containing not less than 75% of incombustible matter in case of coal seams containing less than 30% volatile matter (on dry ash free basis) and 85% of incombustible matter in case of coal seams containing more than 30% of such volatile matter; or(ii)with water in such manner and at such intervals as will ensure that the dust on the floor, roof and sides or any support or structure is always combined with not less than 30% by weight of water in intimate mixture; or(iii)in such manner as the Regional Inspector may approve by an order in writing.
