The Mining Technology Research About The Inclined Thin Orebody Of Baiyan Gold Mine

Short-hold shrinkage is suitable for steeply inclined or inclined and moderately-stable above surrounding rock thin ore.This method is simple technology, cheaply and its technology is already relatively matures so it is widely used in metal mines in our country. As is shown by statistics, in the steeply inclined thin tungsten vein mining Short-hold shrinkage method occupy 85% above. In our 1000 metallurgical mines the user occupied 85% above. Mining quantity accounted for about 40%. Nonferrous quantity accounted for 15%.Surrounding rock of BAIYAN gold mine belong to medium solid and steep thin veins. The method has been used since the beginning of the operation in the year of 2007 in this mine. As is shown by statistics, the rate of recovery is 59.84%, dilution ratio is 18.44%, the stripping ratio is 13.87m/kt. Compared to the application situation of other mines at home and abroad, this mine has a larger loss dilution and stripping ratio, so it serious affect the business economic benefits. According to field survey research, the major reason is unreasonable structural parameter.On the basis of long producing experience and the study of geological detailed survey report, this paper estimates the rock mass quality classification index, and then depending on it have a study on the ascertainment of mechanical parameters of rock mass by use of the Hoek-Brown criterion. The result of mechanical parameters of rock mass shows rock test block mechanic parameters provided by geological detailed survey report generally high so it can't be directly defined as engineering design parameter. In order to obtain a satisfactory stope structure parameter, this paper carried out various simulation schemes by using Flac3D numerical analysis software and carried out numerical simulations on the basic of mechanical parameters of rock mass. Numerical analysis research concludes that length stope span from 32m to 40m and Increase the height of top pillar from 3m to 5m not only the top pillar is relative stable but also stope roof do not emerge high stress concentration zone or tension stress zone for?the lengthen of stope when other structural parameters is invariable. Stope roof is still in the affordability. At the same time, it can reduce stripping ratio and mining costs. In order to validate the rationality of the new scheme, commercial scale test was conducted in 952 level. The test proves that the new scheme make recovery ratio increased to70.31% from 59.84%, the increased is 16% and dilution rate reduced to9.80% from18.44%, the reduced is 19%. So this new scheme of stope structure parameter can effectively enhance the resource recovery rate reduce dilution rate and stripping ratio and therefore has certain economic efficiency. At the same time, the research in the thesis can also provide beneficial references to the similar mines.