关键词: 缓倾斜极厚矿体, 低价值矿种, 房柱法, 采矿成本, 贫化率

Abstract: The minerals of a wollastonite mine in Zhejiang Province are calcite and wollastonite，and the orebodies is generally very thick and gently inclined with stable rock.At present，the roomandpillar mining method used in mines has some problems，such as large amount of mining engineering，relatively high mining cost，general safety and high dilution rate. So the method of one room and one column，the layout of upper and lower layers，and the method of shallow hole falling ore are adopted to optimize the parameters design of ore block，the layout of mining and cutting engineering，the simplification of mining procedure， and the management of ground pressure in the goaf of mining room，so as to make the mining of this kind of low value and gently inclined extremely thick orebodies more safe，economical and efficient. Thus，the safety condition of mining operation is greatly improved，the mining quantity and cutting cost are reduced，and also the ore dilution rate is controlled，which provides certain reference for the subsequent mining of low value and gently inclined extremely thick ore body.

Key words: gently inclined and extremely thick orebodies, low value minerals, the room and pillar min? ing method, the ore dilution rate