克里沃罗格矿区露天矿的设计深度规定在300～350米范围内,实际上是200～270米。经过研究确定,矿床用露天方法开采一直采到500米或更深,在目前条件下也是合理的。增加露天矿的设计深度,必须对固定帮进行扩帮。这是一个复杂的组织和技术课题。通常,露天矿固定帮是由两个台阶和10～12米宽的安全平台组成的。当最终阶段坡面角为60°时,固定帮的帮坡角可达45°,而 The depth of the design of the Krivovodsk open-pit mine is specified in the range of 300 to 350 meters, which is in fact 200 to 270 meters. After research, it has been determined that open-pit mining of mining deposits has been taken to 500 meters or more, which is reasonable under the current conditions. Increasing the design depth of open-pit mines, we must expand the help to help fixed. This is a complicated organizational and technical issue. In general, the open pit fixed gang consists of two steps and a safety platform of 10 to 12 meters wide. When the slope angle of the final stage is 60 °, the helical slope angle of the fixed helix reaches 45 °