关键词: 采场结构, 爆破参数, 出矿管理, 损失贫化控制

Abstract: The sublevel caving method is widely used in metal mines at home and abroad for its safety，efficiency and strong adaptability.However，this method has problems of high ore loss and dilution，which have not been well resolved for many years.To solve this problem，the ore loss and dilution in the process of mining recovery and the approach of ore loss and dilution control should be studied.The effects of non-rhombus layout of drifts，the destruction of the eyebrow line，the blasting partition，the ore-drawing holes blocked by large ores on the pattern of the extraction ellipsoid and its resulting in reduction of coincidence degree of the geometric forms of the caved ores granular were analyzed.And it is founded that it was these common phenomena that restricted the moving range and the overall drawing speed of caved ore，increased the remnant amount of the caved ores and the amount of mixed rock of extracted ores，and gave rise to high ore loss and dilution.Therefore，the detail control method，with the aim of adding one more recovery drifts，controlling blasting holes length without charging，timely dispose large ores and staggering production drifts，was proposed.This method was adopted in Beiminghe Iron Mine (in Handan) and Xiaowanggou Iron Mine (in Dengta)，with remarkable experimental effect.

Key words: Stope structure, Blasting parameter, Drawing management, Loss and dilution control