近年来,露天矿采运设备迅速大型化,尤其是电铲能力的提高速度超过了矿山规模扩大的速度,因而露天台阶轮流开采从调节工况的临时性措施上升为正规的陡帮开采。因为,陡帮开采能使工作帮坡角大大提高,特别是开采倾斜、急倾斜矿体时,有希望获得前低后高的剥岩量时间分布。所以,这种方法在西方国家的斑岩 In recent years, the open pit mining equipment has been rapidly enlarged. In particular, the capacity of electric shovel has increased faster than the scale of the mine. As a result, the open-pit step mining has risen from a temporary adjustment of adjustment conditions to a regular steep mining. Because the steep rock mining can make the working slope angle greatly improved, especially when mining inclined and steeply inclined ore bodies, there is hope to obtain the pre-low-high post-mortem rock mass distribution. So, this method is porphyry in western countries