Section 29(3) in Bihar Minerals (Concession, Prevention of Illegal Mining, Transportation & Storage) Rules, 2019
(3)Maximum depth of Sand Mining. - The maximum depth of mining in the river bed shall not exceed 3 (three) meters measured from the unlined bed level at that point of time or the water level whichever is less. All such pits formed during the course of excavation shall be filled on a regular basis.
