The Mining Methods Design Of Short Hole Shrinkage In Yinmusi Lead Zinc Mine

Shrinkage mining method is China's earliest use and widely applied methods of mining, is a strong adaptability and extreme flexibility mining method. For a long time, due to the low recovery,high dilution rate,flat field and the secondary breakup increasing the worker's labour intensity, the safety condition is bad,all of those have restricted the development of china's underground mines. In recent years the foreign promote the system that power maneuverability and high-intensive mining, this system simplified the structure of bottom ,reduced the phenomenon of drawing blocking, beneficial to improve the production capacity of mining.During the exploitation process,the short hole shrinkage damage the integrity of roof rock,during stoping and drawing ,lead to surrounding rock loose,formed the large area caving,produced mortal dilution.Blot support the two sides surrounding rock of room is the combination and development of technology of roof support and slope protection and further complement and complete for the short hole shrinkage method.Using bolt support is beneficial to prevention rib spalling and general collapse, decreased ore dilution.In this thesis, for Yinmusi lead-zinc mine, on the basis of analysis the present production system, ore block investigation, collections related data, from the technically and economic analysis the original mining method. From mining sequence, ore block arrangement, mining technology,labor organization. designed the 1305 and 1251 middle piece. Analysis the structure parameters of different stopes.Determined ore block arrangement and structure parameters. Using bolt support technology in the process improvement of short hole shrinkage of Yinmusi lead-zinc mine. Through the design, the short hole shrinkage method suitable for mining thickness of the ore body is less than 5 m.Using blot support reinforce upper and footwall, enhance the stability of the rock ore body. All of those is great significance for decreased ore dilution, funnel blockade, improve the safety factor of room operation.