Research Of Efficient Mining Technology For Inclined Formedium-Thick And Fragmentary Ore Bodies In Linglong Gold Mine

Inclined (dip is between thirty degrees and fifty degrees)and medium thickness(true thickness is between eight and fifteen meters)ore body, making up a significant proportion of existing mines in our country. Inclined ore body’s ore-drawing depends on the weight of ore, it is difficult to achieve full recovery of the ore, dip is greater than 30 degrees, trackless equipment is difficult to use. Ore body is medium thickness, monolayer stoping is difficult to achieve, when layered stoping, mining preparation and cutting quantity would increase. Especially when the surrounding rock is broken of hanging wall, it is very difficult to mine, and it is difficult to adopt high efficiency mining method to recycling. This thesis regard Ling Long gold mine’s Da kaitou diggings ore body condition of Shan Dong Gold as the background, carrying on the study of high efficient mining technology about dipping medium thick broken ore body. It has great significance to improve the mining technology of this ore body, increase the production capacity and reduce costs.On the basis of fully analyzing the mining method and mining examples home and abroad of the inclined, medium thickness, broken ore body, the characteristics and applicable conditions of commonly used such as Sublevel room method, Slice stoping method and Filling method into the road were analyzed and summarized in this paper. Combined with Ling Long gold mine’s Da kaitou diggings ore body conditions, this paper has carried on the comparison and selection of mining method. On the basis of comparing the bottomless pillar sublevel caving method and the sublevel room method, this paper put forward the sublevel caving stage room method that controlling ore-drawing as stage. Combined with the reality of mining engineering, choosing the experiment stope, this paper has finished the mining design and stope design of the experiment ore block. Industrial test process, this paper has carried on the blasting vibration monitoring and stress field evolution analysis of stoping process. Through the field monitoring and laboratory analysis, this paper has optimized the parameters of stoping. Industrial test results show that the mining method has more advantages in the process of mining the inclined thick broken ore body.This thesis achieved the following useful conclusions through the study:(1) Inclined and medium thick ore body, The stage room method of the sublevel local control ore removal is adopted, using the synthesis technique of trapezoidal sublevel stoping、 local control ore removal、blast force carrying, Pressure of ballastless extrusion blasting、 induced caving and so on, effectively solved the exquisite mining technical problem of inclined medium thick broken ore body in Ling Long, making safety, high efficiency and low cost of mining come true, achieving the innovative achievements and economic benefit is remarkable.(2) In order to protect the rock mass’s stability of hanging wall, reduce the blasting damage to the rock mass of hanging wall, using the induced caving technology, through reserve two meters thick triangle pillar as a protective layer on the hanging wall of the ore body, when mining the under section of bord, as the stope mining operations from the hanging to the footwall, the triangle pillar would natural caving because of the excavation disturbance and stress concentration, So as to realize the recycling of temporary pillar. The induced caving technology not only protects the stability of the hanging wall but also effective recovery of the(3) Reducing the hanging wall caving ore residue is a technical problem in inclined ore body stoping. Using the mining operations from the hanging to the footwall、upper and lower segment forms the stoping sequence of bench mining,due to take full advantage of the function of explosive force, better solved the problem of a large amount of ore residual of footwall due to the ore body’s dip is slow,making the room stoping rate above 90%.(4) Pressure of ballastless extrusion blasting at each section, improving the blasting effect effectively, at the same time reducing vibration and impact damage on the hanging wall which come from the stope blasting.(5) Mining with medium-length hole blasting、ore is transported by scraper、more segmented work at the same time, and each piecewise partial out of the mine, meeting the requirement of safe and efficient mining; Satisfying the production supply of ore.