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为了在铬矿24群投产前维持铬矿石生产能力,延长22群服务年限,给国家提供更多的铬矿石。铬矿决定通过浅井开采14群、8群等小矿群。8群原有一口竖井,只要清理修复再延深一点即可投入使用。14群需另选竖井位置。一般用作提升竖井工程布置必须在移动带以外,而移动带的圈定与采区上部岩石强度、层理和节理发育情况、坑内开采所用的采矿方法和开采深度有关。常用的圈定方法是以上盘岩石40°～60°为崩落角;下盘岩石以45°～70°为崩落角。矿体两端崩落角在80°以上。用这种方法来圈定的矿山在开采倾斜和急倾斜厚矿体,尤其是用崩落法回采矿体时是非常必要的。而我矿小矿群与上述情况则大不相同,如果用上述方法圈定崩落
In order to maintain the production capacity of chrome ore before the production of 24 chrome ore mines, the Group extended the service life of 22 mines and provided more chrome ore to the country. Chromium ore is decided to mine 14, 8, and other small groups through shallow wells. The original group of 8 shaft, as long as the repair and then deepen a little bit can be put into use. 14 groups need to choose another shaft position. Generally, the layout of the shaft for lifting the shaft must be outside the moving belt. The delineation of the moving belt is related to the rock strength, bedding and joint development in the upper part of the mining area, and the mining method and mining depth used in the pit mining. Commonly used method of delineation is based on the plate rock 40 ° ~ 60 ° as the collapse angle; the next rock to 45 ° ~ 70 ° as the collapse angle. Ore collapse at both ends of the ore body is above 80 °. Mines delineated in this way are necessary for the mining of sloped and steep thick ore bodies, especially when using the caving method to recover the ore body. And mine mine group and the above situation is very different, if the above method of delineation of avalanches