Abstract: Taking the Xinjiang Hami Huangtupo Copper Zinc Mine as the research object,there exists series of problems in the first phase mining,such as high loss and dilution rate,poor ventilation.Aiming at these problems,the new scheme of two steps mining method for exploration of deep mineral resources is put forward.That is,according to the vertical direction of the ore block（thickness of ore-body is 10 m or higher),ore block is divided into the room and pillar.Two-step mining method is adopted,firstly recovering room,and then pillar; For ore room,the sublevel stoping method with subsequent backfill is used.For ore pillar,the upwards horizontal layered stoping with backfill is adopted.Based on FLAC3D,the mining process at the second step of the new scheme is numerically simulated.At the second step of mining,there is no caving and collapse of the roof.Through industrial tests of step one and step two,it is found that the new scheme has advantages of working concentration,high utilization rate of equipment,small exposed roof area at stoping,high security in the operation,lower loss at pillar stoping,and moderate mining costs.The mining recovery rate and dilution rate were 93.50% and 7.69% separately.It greatly improves the economic benefits of the mine.

Key words: Gently inclined medium thick ore body, Two steps mining methods, Numerical simulation, Economic benefit