Abstract: Combined with the current dumping site of an opencast mine,and in view of potential safety hazard in the existing high-bench dumping site,the current dumping site with a large single high step was adjusted to a multi-step dumping site that consists of more than two benches by adjusting the dumping process.Through the detailed discussion on four kinds of dumping schemes that can form the lower benches,including the gravity glide and automobile combined dumping,the direct automobile dumpling,the field-transferred dumping by dumping truck,and the dumping tuck and electric shovel combined dumpling method,it is concluded from comparison and analysis on safety feasibility,investment costs,operating costs of each scheme,that the upper bench still adopt the current dumping process and equipment,and the lower bench adopts the process of chute - auto combined dumping,so as to finally meet the requirements of keeping safety and stability of the dumping site.

Key words: Dumping site, Bench height, Slope angle, Chute