1. The methods of developing underground mines include excavating soil to form a hole, excavating materials from the pit from the material transportation system, discharging one or more tunnels from the bottom of the pit, and disposing of excavated materials. (n) Tunnel excavation.

摘要

To develop a method that includes forming an underground Mine Pit Mining digging the Earth to form a Hole,Remove the material excavated from the hole by a Conveyor SystemThrow one or more Tunnels from a bottom of the well and remove the material excavated from the excavation of the Tunnel.