Section 147(1) in The Coal Mines Regulations, 2011
(1)There shall be maintained at every mine having working belowground a dust plan on a scale having representative factor of not less than 2000 : 1, clearly showing by distinctive colours, code letter and or numbers, the separate areas: -(i)which are naturally wet;(ii)which require treatment with water indicating the system of water pipe lines laid down for the purpose; and(iii)which require treatment with incombustible dust at such intervals of 24 hours, 7 days, 14 days, 30 days, three months or other specified period as the case may be.Explanation: The intervals referred to in clause (iii) shall be based on the results of analysis of routine mine dust samples collected from the areas concerned.
