关键词: 磷矿开采, 缓倾斜, 软夹层, 薄至中厚矿体, 分段留矿崩落法, 浅孔留矿法

Abstract: In order to determine the mining method for exploiting the deep ore body of No.2 pit in Jinning Phosphate Mine of Yunnan Phosphate Chemical Group Co.，Ltd.，and taking the deep slowly inclined-thin to medium thick-soft interlayer ore body of No.2 pit in the Mine as the research object，on basis of the field investigation，theoretical analysis and scheme comparison，the comprehensive analysis on the occurrence characteristics of ore body mining engineering，the technical conditions and the bottom characteristics of surrounding rock are made.The results show that:①the mixed mining way of ① seam，①1 seam and ①2 seam should have been carried out，and the ore grade could reach 22.97% with the high resource recovery after mixing the ores.②For the typical hard-to-mining ore body of No.2 pit in Jingning phosphate mine，it is very difficult to obtain the ideal economic and technical index by using a single mining method.The section shrinkage-caving method is the right one to take as the mining method to the hanging wall seam.Duo to the thin seam for the footwall seam，the shallow-hole shrinkage mining is taken as the better mining method.The related results provides certain reference for the deep mining of Yunnan phosphate group corporation and the open pit mining of phosphorus mines under similar conditions.

Key words: Mining of phosphate ore, Slowly inclination, Soft interlayer, Thin to medium thick ore-body, Section shrinkage-caving method, Shallow-hole shrinkage mining