A method of converting gently inclined orebody from open-pit to underground mining based on Gebion artificial pillar

Abstract

Disclosed is a gently inclined ore body open-pit-to-underground mining method based on Gebeng artificial ore pillars. During gently inclined ore body open-pit-to-underground mining, ore bodies have been exposed out of the ground surface at the bottom of an open mining pit, at the bottom of an open mining area, an internal-pulse accurate mining inclined drift is arranged in the moving direction perpendicular to the final side slope, the Gebeng artificial ore pillars are erected along with ore block stoping to conduct roof temporary support, and roof supporting anchor rods are arranged during stoping. After a certain length of ore blocks are stoped, the mining area is closed through the Gebeng artificial ore pillars to conduct waste ore filling, roof-contacted filling is conducted on the portion close to a roof through cemented filing bodies or concrete mortar, and the effect of roof permanent supporting is achieved. Circulating is conducted till the mining mode of the ore bodies is completely switched into underground mining. According to the gently inclined ore body open-pit-to-underground mining method, underground mining is in open air, rock drilling, blasting and ore removal canbe conducted through original open-pit-mining equipment, and the open-pit-to-underground mining method which is free of basic construction time, low in waste ore produced quantity, small in ore bodyloss, low in depletion, convenient in artificial ore pillar mounting, low in cost and high in production capacity is created.

Description

technical field [0001] The invention relates to a mining method, in particular to an open-pit-to-underground mining method for a gently inclined ore body based on a Gabion artificial ore pillar. Background technique [0002] In my country's gently inclined orebody open-pit to underground mining mines, the existing mining methods generally have the following technical difficulties: ①Continuing to use the open-pit mining method to mine the shallow gently inclined orebody may cause excessive production stripping ratio and economic stripping. The mining ratio is inappropriate; ②Underground mining method is used to leave a permanent security pillar on the roof, especially for gently inclined ore bodies, and the ore body loss is large; ③Conventional open-pit to underground mining takes a long time to construct infrastructure, the process connection is complicated, and the organization task is heavy; ④The production capacity of conventional underground mining equipment is smaller tha...

AI Technical Summary

Problems solved by technology

[0002] In my country's gently inclined orebody open-pit to underground mining mines, the existing mining methods generally have the following technical difficulties: ①Continuing to use the open-pit mining method to mine the shallow gently inclined orebody may cause excessive production stripping ratio and economic stripping. The mining ratio is inappropriate; ②Underground mining method is used to leave a permanent security pillar on the roof, especially for gently inclined ore bodies, and the ore body loss is large; ③Conventional open-pit to underground mining takes a long time to construct infrastructure, the process connection is complicated, and the organization task is heavy; ④The production capacity of conventional underground mining equipment is smaller than that of open-pit mining equipment, and the transfer is not flexible; ⑤Reserved ore pillars are used for conventional gently inclined ore bodies. Influenced by the filling bodies on both sides, it will also cause a large ore dilution; ⑥The conventional artificial pillar replacement method, on the one hand, the cost of artificial pillars is high and the implementation process is complicated, on the other hand, it is easy to cause safety problems when replacing

[0003] In view of the above problems, there is an urgent need for a method that can effectively solve the problem of long underground infrastructure construction time, many mining waste rocks, large ore body loss, high ore dilution, high cost of artificial pillars, and low production capacity in traditional gently inclined ore bodies. Mining methods for low-level problems

Images