Abstract
Abstract This paper takes the deep ore body of Yunnan Phosphate Group Co. Ltd, the largest open-pit chemical mining enterprise in China, as the research background, and systematically introduces the technical problems recognised by many Chinese researchers in the past eight years on the open-pit to underground mining of gently inclined thin to medium-thick ore bodies with a soft interlayer. It shows that the mining of open-pit transferred to underground is a complex engineering system, and the underground stope surrounding rock and overlying strata present a nonlinear failure process. Through mining process innovation, mining method innovation and improvement, research was undertaken on new processes and technologies for phosphorus mining under complex conditions. The relevant research results not only have important economic value and academic significance for Yunnan Phosphate Group Co. Ltd. but also have important guidance and impetus to the exploitation of a large number of similar phosphate resources in China.
Highlights
The gently inclined orebody with thin-medium thickness occupies a considerable proportion in phosphate mining in China
The results show that the stress state of the floor and the surrounding rock of the roadway is a dynamic process with underground mining
Using the traditional filling method to mine the gently inclined thin to medium thick phosphate ore body with 3-5 m thick soft interlayer, it can solve the problem of high ore depletion rate, large loss rate and safety, but due to the lower grade of phosphate rock and the increase of impurity content, the economic value is lower and cannot withstand the mining cost of traditional filling method
Summary
The gently inclined orebody with thin-medium thickness occupies a considerable proportion in phosphate mining in China. (1) The dip angle of gently inclined phosphate orebody with thin-medium thickness is gentle, and the caving ore cannot be completely discharged at the bottom by means of its deadweight It requires mechanical handling or manual transportation, which causes high loss rate, high dilution rate and low resources recovery. This paper takes deep orebody, which is obtained from Yunnan Phosphating Group Corporation Limited Jinning Phosphate Mine No 2 and No 6 pitheads, Jianshan Phosphate Mine, Kunyang Phosphate Mine No. mining area, as the engineering background, for gently inclined orebody with thin-medium thickness containing soft interlayer transferring open pit into underground mining, it is a recognised technical problem in the mining industry, through some comprehensive research methods like the investigation of relevant literature, site investigation of similar phosphate mines at home and abroad, theoretical analysis, similarity simulation experiment, three-dimensional numerical calculation and engineering analogy, etc. Efforts are on to develop safe and efficient new mining processes and technologies for difficult mining phosphate deposits, and to provide strong technical support for the technological development of the mining industry in China
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