Section 105(1) in The Coal Mines Regulations, 2017
(1)In alluvial soil, morum, gravel, clay, debris or other similar ground,-(a)the sides shall be sloped at an angle of safety not exceeding 45 degrees from the horizontal or such other angle as the Regional Inspector may permit by an order in writing and subject to such conditions as he may specify therein; or(b)the sides shall be kept benched and the height of any bench shall not exceed 1.5 meters and the breadth thereof shall not be less than the height:Provided that the Regional Inspector may, by an order in writing and subject to such conditions as he may specify therein, exempt from the operation of this clause in any working in the case of which special difficulties exist, which, in his opinion, make compliance with the provisions thereof not reasonably practicable.
