联合开采急倾斜矿体时,在向地下开采过渡的区段上,要保持矿山设计能力,充分和高质量地回收资源相当困难。我们研究制订露天-地下联合开采新方法时,注意到利用露天开采和地下开采的技术成就提高露天-地下联合开采过渡区段及下部水平的回采矿石质量及充分回收资源。上述工艺决策的突出特点,是在开采矿田的一翼用露天方法将一部分矿量超前开采出来。由于向内部排土场运输岩石使运费减少,生产剥离量下降,以及征用土地减少,这 Joint mining of steep orebodies, mining transition to the underground section, to maintain the design capability of the mine, full and high-quality resources recovery is quite difficult. When we studied and developed a new open-underground joint mining method, we noticed that the technical achievements of using open-pit and underground mining have improved the quality of reclaimed ore from the open-underground joint mining transition section and the lower level and fully reclaimed resources. A prominent feature of the above process decision-making is the exploitation of a part of the ore amount ahead of time by the open-air method in the wing of the mining field. Due to the reduction of freight charges due to the transportation of rocks to the internal dumps, the decrease of production peel quantity and the reduction of requisitioned land, this