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1 The angle of the open slope of the section affected by underground mining shall be appropriately reduced according to the degree of influence;
2 In the range of rock mass mining in underground mining, open-pit mining should not be carried out at the same time . When it is required to open both underground and underground,
Effective technical measures should be taken;
3 The order of recovery of the open and underground sections shall be specified in the design.
2. The order of mining in the open air and underground mining shall comply with the following provisions:
1 Underground mining should be backwards from the end of the ore body to the open slope;
2 When the pit is filled with cement, the underground mining can be recovered from the bottom of the open pit.
3. Simultaneous mining in the open air and underground, the selection of underground mining methods should meet the following requirements:
1 inclined or steeply inclined ore body, when the ore rock is stable, it is advisable to use the empty field and post-filling method to recover the ore. The empty field method can also be used to return the mining room to temporarily retain the pillar. When the ore is medium-stable, it is better to use the upward horizontal layered filling. Method or sectional filling method for recovery; when the ore is not stable, it is recommended to use the downward cementation filling method to recover;
2 The ore body that is gently inclined and deepened can be recovered by the room column method or the filling method.
4. When the open and underground work in the same vertical plane, the vertical spacing between the two working faces shall be determined by rock mechanics calculation, but shall not be less than 50m .
5. When conditions permit, the ore transportation or transfer system for simultaneous mining in the open and underground areas should be arranged in a coordinated manner.
6. When the local mining is carried out by Pingshuo, the water in the open pit can be discharged to the surface by drilling holes or patios. When it cannot be discharged by the flat raft, it should be discharged from the open pit and drained through the underground pumping station.
A technical and economic comparison should be made. 
The interior rearview mirror can not only determine the distance from the vehicle behind, but also observe the vehicle behind when turning. In addition, it can effectively prevent rear end collisions and avoid scratches. For vehicles following closely behind your car, due to the presence of blind spots, the left and right rearview mirrors cannot be seen, and can only be seen through the inside rearview mirror.
1. When mining in the open air and underground, the following provisions shall be complied with: