(1) The overburden and waste material obtained during mining operations shall not be allowed to be mixed with non-salable or subgrade minerals/ores. They shall be dumped and stacked separately on the ground earmarked for the purpose.
(2) The ground selected for dumping of overburden, waste material, the subgrade or nonsalable ores/minerals shall be away from working pit. It shall be proved for absence or presence of underlying mineral deposits before it is brought into use for dumping.
(3) Before starting mining operations, the ultimate size of the pit shall be determined and the dumping ground shall be so selected that the dumping is not carried out within the limits of the ultimate size of the pit except in cases where concurrent back filling is proposed.