Sublevel open-stoping mining method with subsequent backfilling for long-hole caving in thin ore bodies

Abstract

The invention discloses a sublevel open-stoping mining method with subsequent backfilling for long-hole caving in thin ore bodies. The sublevel open-stoping mining method with subsequent backfilling is characterized by comprising the following steps: arranging ore blocks along the orientation of the ore bodies, and dividing the ore block into ore chambers and ore pillars; dividing the ore blocks into segments in a vertical direction by sublevel drilling gate ways with an interval of 15-20m; drilling upward parallel or fan-shaped and downward parallel or fan-shaped medium-depth holes in the sublevel drilling gate ways to recover, wherein different sublevel caving sequences can be adopted according to the stabilization condition of the hanging wall surrounding rocks of the ore bodies; laterally loading ores by using a carry scraper from a bottom trench; locally anchoring the unstable areas of the hanging walls of the ore bodies, and drilling the anchored holes along with the caved holes; after the ores are recovered from the ore chambers, recovering the ore pillars according to the condition of the adjacent ore blocks, and finally filling goaf with waste rocks. The method has the prominent effects of good labour conditions, safety in working, high operation efficiency and high production capacity, and can realize intensified mining and ore mucking, and effectively control ore losses and dilution rate.

Description

technical field [0001] The invention relates to the field of mining, in particular to a thin ore body middle-deep hole avalanche segmented empty space and subsequent filling mining method. It is suitable for mining of steeply inclined thin ore bodies. Background technique [0002] The shallow hole retention method is one of the most widely used mining methods in underground mining in my country. It is not only widely used in steeply inclined thin veins, but also widely used in medium-thick ore veins; even in some deposits where the ore retention method is not suitable (such as unstable ore rocks, not steep dip angles, or ore agglomeration), ore retention is reluctantly used. Law. [0003] The characteristic of the shallow hole ore retention method is that the workers work directly on the ore retention pile under the exposed surface of the mine house, mining in layers from bottom to top, and the layer height is 2-3m. About one-third of it, and the rest is temporarily kept ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from this that the main disadvantage of the shallow hole ore retention method is that workers need to carry out a series of operations such as rock drilling, blasting, and field leveling under the exposed surface of the empty field of several hundred square meters, and the safety degree is low; according to statistics, the number of small and medium-sized metal mines Roof fall accidents in stopes generally account for about 30% of the total number of accidents in underground mines, ranking first in casualty accidents in underground mines

[0005] It is difficult to mechanize a series of operations such as the flat field of the shallow hole ore retention method, and the labor intensity is high and the production efficiency is low

[0006] When the surrounding rock on the ore body wall is unstable, if the shallow hole ore retention method is adopted for mining, when a large amount of ore is drawn, the increase in the exposed surface of the surrounding rock will often cause a large number of surrounding rocks to fall off, and the loss of ore dilution will increase; even the stope will be scrapped.

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