Trial Mining Practice of 1212(1) Working Face Under Aquifer in Gubei Coal Mine of Huainan Mining Area

Through the research and practice for increasing mining upper limit and reducing waterproof coal pillars left in 1212(1) working face of Gubei Coal Mine, it carried out successful trial mining for 11-2 coal seam under the rich aqueous loose aquifer from medium to strong, which not only reduced the loss of national coal resources, but also improved economic benefits of coal mines.