Mining method for recycling long-thick ore body hanging wall ore and transforming strip mine to underground mine

Abstract

The invention relates to a mining technique for recycling hanging wall ore body and transforming a strip mine to an underground mine, in particular to a mining method for recycling long-thick ore body hanging wall ore and transforming the strip mine to the underground mine. The method comprises the following steps: dividing the hanging wall ore on the other end of a mining pit into a transitional-period underground mining area, a transitional-period strip mining area and an isolation ore pillar at the later period of the strip mining; simultaneously mining the ore in the transitional-period strip mining area and the transitional-period underground mining area, and backstoping an upper side of hanging wall ore after being disclosed by adopting a open-stope method; and sequentially forming a cover layer along the trend of the ore body from the end of the pit without the hanging wall ore by utilizing a method for backfilling a dead zone with waste stone, breaking the ore pillar reserved when the upper side of hanging wall ore is mined in the area with the cover layer reaching the thickness requirement after the backstoping of the upper side of hanging wall ore is ended by adopting the fragmental open-stope method, improving the mining intensity after the cover layer is formed, and gradually carrying out the mining, cut and backstoping work of a second section of deep ore. By adopting the method, the transition from the strip mining to the underground mining is realized, the reserved hanging wall ore reserved in the strip mining can be recycled, and the waste of mineral resource can be avoided.

Description

technical field [0001] The present invention relates to a technology for recovering a sidewall ore body and converting from open-pit to underground mining, in particular to the methods of open-pit mining, underground mining, mining of sidewall ore bodies under high and steep slopes, and the formation of covering layers and their temporal and spatial correlations during the transition period , especially suitable for open-pit-to-underground mines with large ore body thickness and strike length. Background technique [0002] Relevant statistics show that after open-pit mining, the amount of ore remaining outside the open-pit boundary accounts for 5% to 16% of the total reserves of open-pit mining. If it is not recycled, it will cause a serious waste of resources. In recent years, in order to reduce the stripping ratio, many open-pit mines at home and abroad have adopted the steep side mining method. With the increase of mining depth, the hanging side ore body gradually accu...

AI Technical Summary

Problems solved by technology

The key technologies of the transitional mining are embodied in the safe mining technology of the open-pit transitional area, the safe mining technology of the underground transitional area, the safe recovery technology of hanging side ore bodies and isolated pillars, and the technology of overburden formation. The temporal and spatial relationships of these four key technologies are intricate. , Improper handling can easily lead to production capacity imbalance and safety accidents

Images