Abstract: Searching for the deposit associated with concealed granite is the goal and difficulty of prospecting in the deep and periphery of Limu mining area. Previous prospecting and exploration mainly focused on the third stage granite with shallow emplacement， while the understanding of the second stage granite with deep emplacement is limited to its upper vein-type orebody， which restricts further prospecting breakthrough.According to geological characteristics of granite type deposits，the characteristics of vertical zoning are resummarized in the ore-bearing granite in Limu Orefield.The vertical zoning includes the inner zone and outer zone of granite body，and contains three genetic types and five industrial deposit types.This paper reveals the influence of tectonic activity on the vertical zoning and mineralization of Limu granite.When the second stage of granite intrudes into the deeper part， deposits are often composed of multi-layer ore bodies and dikes or vein orebodies are mostly located in the far upper part of granites.However， when the third stage of granite intrudes into the superficial part，dikes or vein orebodies are mostly located in the proximal upper part of granite and even connected with granites.According to vertical zoning in the Limu granite，the altered granite type W-Sn deposits are discovered in the second stage granite for the first time，such as Yucai Deposit and Sangehuangniu Deposit.The scale of Yucai Deposit is medium-sized and Sangehuangniu Deposit is small-sized，in addition，new understanding of vein type deposits in the outer zone of granite is obtained.It is a breakthrough in prospecting that Sn-W veins with industrial significance are discovered in the periphery of Limu mining area.The above practice shows that Limu Orefield still has great potential and two prospecting targets for the next step are proposed.One is relative protrusion of low-lying places within shape of concealed granites in deep edge of old mining area，in addition，southeast of Shuiximiao，the other is the deep of the sections of Xiangfenchang，Huangtongjie-Gougualei in the west of mining area.

Key words: deep prospecting, concealed granite, vertical zoning, prospecting prediction, prospecting target area, prospecting breakthrough