Sublevel open stoping backfilling mining method for gentle-dipping and medium-thickness ore body

Abstract

The invention discloses a sublevel open stoping backfilling mining method for a gentle-dipping and medium-thickness ore body. The method comprises the following steps that ore blocks are arranged, wherein the ore body is divided into the ore blocks along the trend of the ore body, studs are reserved between the ore blocks, the ore blocks are divided into a plurality of strip-like stopes along thetrend of the ore body, filling ventilation liaison passages are formed in the studs, and each filling ventilation liaison passage is communicated with the corresponding strip-like stope through a stope filling ventilation well; the ore blocks are divided into a plurality of sublevel ore block bodies in the height direction, and ore withdrawal roadways are arranged outside lodes on the bottom of each sublevel ore block body respectively; a plurality of ore withdrawal inlet passages are tunneled along each ore withdrawal roadway, the ore withdrawal inlet passages laterally penetrate through thestrip-like stopes, and drilling drifts are tunneled from the ore withdrawal inlet passages; stoping for ore withdrawal is conducted, wherein blast holes are drilled in the drilling drifts and intensively filled with an explosive for blasting; the ore obtained after blasting is withdrawn into an ore pass through the ore withdrawal inlet passages and the ore withdrawal roadways; filling is conducted, wherein after stoping of the stopes in the same section is completed, one-time filling is intensively conducted. The method has the advantages that ore is efficiently and safely withdrawn and transported.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a segmented empty-stop-and-fill mining method for gently inclined medium-thick ore bodies. Background technique [0002] It has always been a technical problem at home and abroad to mine gently inclined medium-thick ore bodies with a dip angle of 15°-35° and a thickness of 10m-30m. Due to the slow inclination of the ore body, the ore cannot be slid out of the mine by itself, and it needs to be transported by machinery or scraped. However, the stope has a high ceiling, difficult to manage the roof, and there are potential safety hazards. [0003] According to statistics, the commonly used methods are the room-and-pillar method (accounting for 50%), layered filling mining method (accounting for 30%), and segmented open-field and subsequent filling mining method (accounting for 20%) for gently inclined medium-thick ore bodies. Wait. When the room-and-pillar method is used to mine g...

AI Technical Summary

Problems solved by technology

When the room-and-pillar method is used to mine gently inclined medium-thick ore bodies, because the inclination angle exceeds the climbing angle of the scraper, it is often necessary to arrange pseudo-sloped mine exit roadways, but this increases the distance of the scraper and reduces its operating efficiency, and generally Rock drilling is arranged in shallow holes, the mining efficiency of the scraper is low, the loss rate of the left pillar is high, the stress of the goaf is concentrated in the pillar, and the safety hazard is also relatively large; the layered filling mining method is widely used, Especially for the mining of high-grade ore deposits, in order to improve the ore recovery rate and control rock movement and roof pressure, more and more mines adopt the layered filling mining method

However, this kind of mining method cannot mine the full thickness at one time, and needs to carry out the mining and filling process in multiple times, and the operation efficiency is low; the two-step stope commonly used in the segmented open stop and then filled mining method for gently inclined medium-thick ore bodies is adopted at present The layout method has the disadvantages of large mining and cutting engineering volume, high dilution rate and loss rate, and its stope structure size is difficult to apply to the deep mining environment, and the mine application effect is poor

[0004] For the mining of gently inclined and medium-thick ore bodies, if the strip-shaped approach and layered filling mining method of first cutting the top and then mining the medium and deep holes are adopted, although the mining and cutting work in the vein is saved and the output of waste rock is small, the single mining The production efficiency of the field is low, and the scraper needs to change the working face continuously, so the efficiency is difficult to improve; if the existing two-step method is used for the mining of the gently inclined medium-thick ore body, the segmented open-site and then filling mining method is bound to reduce the segmental cost. height, the amount of mining and cutting works increases

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