[Introduction]:

Open pit mining refers to ground mining preparation and stripping by excavating open trenches. Underground mining is to reach and explore the ore body through a number of underground shafts and tunnels.

[Introduction]:

Rock in the metallic and non-metallic mines is usually hard, so it is difficult to recover them via excavating equipment. The common practice is first crushing them into smaller blocks that meet the requirements through blasting and then transporting ore and waste rocks to the storage site and waste dump respectively. Therefore, as for open pit mining, the process of trenching, stripping and mining is almost the same.