Recovery of Level Pillar between Open-pit and Underground Mine by Using Underhand Heading Fill Method

查看全文 作　　者：Sijing Cai, Hai Zhao,Shangjun Ying 1) Civil and Environmental Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2)Fujia Mine, him Nickel Corporation, Jilin 132311, China 出　　处：《Journal of University of Science and Technology Beijing》索引2001年第8卷第4期,共4页 摘　　要：The upper part of the Fujia deposit was mined out by open-pit, and the lower part is being mined underground. The level pillar between open-pit and underground mine had a thickness of 24 m, a length of 300 m and a maximum width of 35 m. As the level pillar contained about 5.2 million ton ore of high nickel grade, it was necessary to recover the level pillar. Because of special need of safety, underhand heading cut-and-fill stoping method was used. For the first two layers of heading, the cemented fill materials were a mix of water and high-aluminum-content cement with silicate gelling agent; and for other heading layers, total tailings was added into the fill mix in order to reduce the cement consumption. Finally, the level pillar was recovered successfully. 关 键 词：level pillar underhand heading method fill materials with silicate gelling agent