Section 37U(2)(iii) in The Rajasthan Minor Mineral Concession Rules, 1986
(iii)Wherever possible, use such waste rock or overburden or other rejects for back filling the worked out quarry or mine where mineral has been recovered up to the optimum depth, with a view to restore the land to its original use or desired alternate use. Where the backfilling is not feasible, the waste dumps shall be scientifically vegetated by suitable native species to prevent erosion and surface run off; and