Author：Huada Quarrying Machine FROM：Stone quarry machine manufacturer TIME：2021-12-27
Open-pit mining is a stone mine in which the covering layer and weathered layer on the surface of the stone ore body must be stripped before it can be mined. Digging open trenches from the ground and creating a mining face, extracting blocks from the face.
Generally, it means that the ore body distribution presents a certain angle with the horizontal ground. At this time, the mining face must be built on a sloping hillside.
Recessed open-pit mining is the ore body is in a horizontal state, with a large area exposed to the surface. The mining of this type of terrain requires mining from the surface to the underground layer by layer.
Pit mining is actually a special case of sunken open-pit mining. With the continuous deepening of the mining operations of stone mines, many stone mines have gradually evolved from the hillside open-pit type to the sunken open-pit type, and finally into the well-type mining. Many pit mines in the world have a depth of more than 50 meters, and even 80 meters or more.