A mining method for mining steeply inclined thick ore bodies with broken hanging wall rocks

Abstract

The invention discloses a mining method for stoping broken steeply inclined thick ore bodies in hanging side surrounding rock. Stope rooms are firstly mined in ore blocks, then ore pillars are recycled, when the stope rooms are stoped, and the ore bodies are divided into two layers in the thickness direction to be mined, and a layering, close to the hanging side, with the thickness being 1-2 m isfirstly mined; with the advance of a working face from bottom to top, the hanging side surrounding rock is strengthened by adopting advanced small pipes grouting and rock bolting, arch pillars are blasted into peach-shaped pillars, and using a wide opening funnel formed between the two peach-shaped pillars, and part of ore not released in the flat base of the upper middle section are put into themiddle section; and then a layering, close to a heading side, in the stope rooms is mined, undercutting is carried out in the bottom of the stop, and deep hole basting in the horizontal sector is carried out by an undercutting layer is as the free face. Compared to a blasthole stopping method and a caving method, the mining method for stoping the broken steeply inclined thick ore bodies in the hanging side surrounding rock is low in dilution ratio, less in mining engineering quantity, and high in resource recovery rate; and compared to a filling method, the mining method for stoping the brokensteeply inclined thick ore bodies in the hanging side surrounding rock is low in mining cost.

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 sharply inclined thick ore body with broken upper wall surrounding rocks. Background technique [0002] At present, metal and non-metallic underground mines mostly use segmental caving method or layered filling method to mine steeply inclined thick ore bodies with broken hanging wall rocks, and some mines also use open-field mining rooms such as stage mine method to back and forth to mine the upper wall enclosure Steeply inclined thick orebodies with medium fractures. When this type of ore body is mined by the sub-caving method, the mined ore is mined under the cover of the collapsed rocks on the hanging wall. During the ore extraction process, the rock and ore are mixed with each other, resulting in a significant drop in the ore grade. This further affects the significant increase in the cost of mineral processing, es...

AI Technical Summary

Problems solved by technology

When this type of ore body is mined by the sub-caving method, the mined ore is mined under the cover of the collapsed rocks on the hanging wall. During the ore extraction process, the rock and ore are mixed with each other, resulting in a significant drop in the ore grade. This further affects the significant increase in the cost of mineral processing, especially when mining low-grade ore, a large amount of waste rock mixed in will directly lead to the failure of the mined ore to be selected, and if it is discarded, it will lead to a large waste of resources; when the filling method is used to mine this type of ore body, It is also necessary to build a supporting filling system and prepare corresponding filling materials. The mining cost is significantly increased, and the filling method has a long construction period and low production capacity, which is extremely unfavorable for the mining of sub-marginal economic minerals.

Some mines use the stage mine method to mine steeply inclined thick ore bodies with moderately broken hanging wall rocks. When carrying out medium and deep hole blasting, due to the impact of blasting vibration on the hanging wall rocks, the roof collapses and waste rocks are mixed in. Seriously affected the ore grade. In addition, when using medium and deep hole blasting, due to poor control of the ore-rock boundary, it is easy to cause the loss index to be too large

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