A kind of mining method for back mining the steeply inclined thick ore body with medium or higher stable ore body

Abstract

The invention discloses a mining method for stoping a high-dipping thick orebody with the medium and above stability in an ore mass. The method comprises the steps that an inverted-stepped mining faceis arranged in the thickness direction of the orebody in an ore room, mining is advanced from bottom to top, the mining face part close to a hanging wall is ahead of the mining face part close to a lying wall by a certain height, the advanced mining height of the mining face part close to the hanging wall is utilized to provide an operation space, a shallow hole is drilled upwards in the operation space, and a horizontally parallel medium-length hole is drilled in the direction of the lying wall to blast and break ores; and an anchor rod is used for anchoring partial unstable rocks on the hanging wall in the operation space, a part of the mined ores is temporarily left in the ore room to serve as a protective bottom column and a buffer layer of the hanging wall and provide a standing platform for upward operation and temporarily bearing hanging wall rocks, and a large quantity of ores are removed after ore room exploration is completed. The mining method is beneficial for reducing mixing of waste rocks in the mining process of the high-dipping thick orebody and improving the recycling ratio of resources, the blackness of the ores is even, the stope preparation work amount is less,and rock drilling and blast working are easy to organize.

Description

technical field [0001] The invention belongs to the technical field of non-coal underground mining, and in particular relates to a mining method for mining a steeply inclined thick ore body with medium or above stable ore rock. Background technique [0002] In non-coal underground mines, the staged mine method or the segmented mine method is often used to mine steeply inclined thick ore bodies above the middle of the rock, and a vertical cutting groove is opened in the middle of the mine room, and the cutting groove is used as the free surface to implement upward fanning. Medium and deep hole blasting ore falling. The main problems of these mining methods are: using fan-shaped medium and deep hole blasting to drop ore, it is difficult to accurately control the hole bottom position and hole bottom distance of each blast hole when drilling blast holes, and it is easy to have a large loss rate and waste during blasting. If the ore is mixed in, the block degree of the ore is al...

AI Technical Summary

Problems solved by technology

The main problems existing in these mining methods are: using fan-shaped medium and deep hole blasting to drop ore, it is difficult to accurately control the hole bottom position and hole bottom distance of each blast hole when drilling blast holes, and it is easy to have a large loss rate and waste during blasting. If the ore is mixed in, the lumpiness of the ore is also very uneven, and the large lump rate is high; the length and azimuth angle of each hole in the fan-shaped blasthole vary greatly, which makes the construction organization of rock drilling and blasting more complicated, and the quality of rock drilling and blasting is difficult to be guaranteed. , low efficiency, and thus affect the economic benefits of the mine; during the mining process, the local unstable surrounding rocks on the hanging wall collapsed into the ore due to the impact of blasting vibrations, etc., resulting in a serious decrease in the ore grade; The room method needs to excavate more rock-drilling roadways or chambers, so the amount of mining work is relatively large, and the mining cost is relatively high

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