Recovery of long thick ore body hanging side ore and mining method in the transition period from open pit to underground

Abstract

The present invention relates to the recovery of hanging side ore bodies and the open-pit to underground mining technology, especially Recovery of long-thick ore body hanging side ore and mining method in the transition period from open-pit to underground . At the end of the open-pit mining, the hanging side ore body at the other end of the pit is divided into the transitional underground mining area, the transitional open-pit mining area and the isolated ore pillar; After the body is exposed, the open-pit method is used for mining; at the end of the open-pit mining, starting from the end of the pit without hanging side ore, the method of backfilling the empty area with waste rocks is used to form covering layers along the direction of the ore body, and the open-pit method is mined in sections. After the hanging side mine is completed, in the area where the covering layer meets the thickness requirements, the ore pillars left during the mining of the hanging side ore body will be collapsed. After the covering layer is formed, the mining intensity will be increased, and the second section of the deep ore body will be mined. Cutting and mining work is gradually carried out. The invention realizes the transition from open-pit mining to underground mining, and recovers the hanging side ore body outside the open-pit, avoiding waste of resources.

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 accumul...

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

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