Since the mining is from the top to the bottom, the upper steps are firstly mined to the realm, and some of the fixed slopes are formed, and it is required to remain stable for a long time without a large number of landslides. In operation, the smaller the final slope angle, the safer it is. However, if the slope angle is too small, a large amount of rock-peeling will be increased during the mining process, resulting in deterioration of the economic benefits of the mine. If the final slope angle is increased, it will exceed the angle of safety and stability, which will cause slope landslide and endanger the safety of the stop workers. A large open pit mine in the country has hundreds of thousands of m 3 landslide accident occurred, causing great economic losses to the mines, and therefore can not blindly increase the final slope angle, to prevent accidents. The final slope angle of some mines in China varies from 35° to 65°.
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