关键词: 露天矿, 陷落柱, 露天开采, 可行性研究

Abstract: In order to study the feasibility of mining collapse column in Hequ open pit mine, the formation causes and strata occurrence of collapse column are analyzed in detail; Numerical simulation software is used to analyze the stability of the north slope, south slope and west slope of the collapse column, and the reasonable slope angle of each slope is given; Based on the basic principle of open-pit mining, the economic and reasonable stripping ratio of Hequ open-pit mine is calculated, and the collapse column mining scheme is further proposed and optimized. The research results show that the reasonable slope angles of the north, South and west slopes of the collapse column are 41 °, 43 ° and 30 ° respectively, and the economic and reasonable stripping ratio of Hequ open-pit mine is 6.2m3/t. The proposed collapse column resources are fully exploited, partially exploited and without mining. The stripping ratio of the three schemes are 2.51m3/t, 2.37m3/t and 4.02m3/t respectively. Are less than the economic and reasonable stripping ratio. Therefore, the resources inside the collapse column are economically recoverable, and the economic benefit of all resources mining scheme is the best.