中国矿山工程

A phosphate ore body belonging to a state company in Yichang has an average thickness of 17.71m and an average dip angle of 14.22°, which is a gently inclined massive phosphate ore body, with a loose structure of the ore bed and the roof, developed joints and poor stability; there are many dangerous rock bodies on the surface, which do not allow surface collapse; multiple poor and rich ore beds are distributed alternatively, which is not conducive to the classification and utilization of poor and rich ores. Overall, conventional mining is difficult. This paper describes in detail the panel layout, stoping sequence, secondary development and stoping process with room & pillar cut-and-fill method with subsequent filling under bolt and cable supporting roof and sublevel cutting roof. Production practice shows that this mining method has a larger production capacity than the original design, less secondary development quantity, high degree of automation, high safety factor, low ore loss and dilution rate, allowing for easy sectional mining, which can better meet the needs of mine production safety. The aim is to provide experience for the development of other similar mines.