Section 147(6) in The Coal Mines Regulations, 2011
(6)Where any place or part of the mine is to be treated with incombustible dust -(i)before treating with incombustible dust, all coal dust shall be cleaned, as far as practicable, from the roof, sides, floor, props, cogs, bars, brattice cloth or any other objects or structure or place on which coal dust may deposit, and all dust so collected shall be removed to the surface within 24 hours;(ii)incombustible dust shall be spread on the objects, structure and places aforesaid in adequate quantity and at such intervals as may be necessary to censure compliance with the provisions of this sub-regulation;(iii)the cleaning of coal dust and spreading of incombustible dust shall be carried out in the direction of the flow of the air;(iv)a sufficient supply of incombustible dust shall be kept readily available at suitable places in the mine, and any deficiency in the supply of dust underground shall immediately be brought to the notice of the manager; and(v)incombustible dust stacked at different places and kept on pans or on dust barriers in the mine shall be changed whenever it is no longer readily dispersible or whenever fever it becomes coated with coal dust, such dust shall be removed.
