Method for improving ore recovery rate of gentle dip ore body by non-pillar sublevel caving

A segmented caving method without pillars, which is applied in ground mining, earth square drilling, underground mining, etc.

Inactive Publication Date: 2013-05-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Description
  • Claims
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Problems solved by technology

[0006] Purpose of the invention: The purpose of the invention is to solve the effective problem of the footwall triangular ore cone in view of the application needs of the non-bottom column segmental caving method in the gently inclined medium-thick ore body. Problems such as back mining and effective recovery of residual ore in the footwall provide a feasible solution for improving the ore recovery effect of the sub-level caving method without bottom pillars in gently inclined medium-thick ore bodies

Method used

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  • Method for improving ore recovery rate of gentle dip ore body by non-pillar sublevel caving
  • Method for improving ore recovery rate of gentle dip ore body by non-pillar sublevel caving
  • Method for improving ore recovery rate of gentle dip ore body by non-pillar sublevel caving

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Embodiment Construction

[0011] In order to ensure a good recovery effect and safety in the mine, the normal recovery roadway is ahead of the auxiliary recovery roadway in the mining sequence. When the normal recovery roadway on both sides is finished and the ground pressure is fully released, the auxiliary mining roadway will be excavated and recovered. The auxiliary roadway is still mined row by row by vertical upward fan-shaped hole blasting, and so on until the mining of the residual ore at the triangular ore cone and its ridge is completed.

[0012] If the lower section corresponding to the stud has withdrawn to the design boundary, the auxiliary recovery approach only needs to be excavated to the caving area at this level, and there is no need to excavate the cutting groove. However, if the lower section has not retreated to the designed footwall boundary, the secondary recovery roadway can only be excavated to the distance of 1-2 rows of holes in the ore body direction of the footwall ore-rock ...

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Abstract

The invention discloses a method for improving ore recovery rate of a gentle dip ore body by non-pillar sublevel caving. The method is realized by secondary recovery of a triangular ore cone in a lower disc of the sublevel ore body as well as ore residues at the ridge of the upper part by means of paving assistant recovery accesses in a peach-shaped jamb between two accesses, wherein the specification of the assistant recovery accesses is smaller than dimension of a normal mining roadway and is 2.0*2.0m to 3.0*3.0m. According to the method, the ore recovery rate by the integral mining method is improved by about 5%, maximally about 8-10%; and the quantity of ore recovered in an accumulated manner and the waste ore mixing amount reduced are great, and the benefit is very remarkable.

Description

technical field [0001] The invention relates to a mining method in an underground mine, and belongs to the engineering technical field of improving the ore recovery rate of the bottom-pillar-free segmental caving method by using a new mining process. Background technique [0002] When the non-pillar segmental caving method is applied to gently inclined medium-thick ore body conditions, low ore recovery rate and high dilution rate are common phenomena, and the ore loss and dilution indicators are usually higher than those of steeply inclined thick and large mines. 10-20 percentage points higher than the body, seriously affecting the technical and economic effects of mining. [0003] The analysis shows that, for the segmental caving method with a relatively gentle dip angle and a vertical approach, even if the full coverage of the rock-cutting ore body footwall is achieved along the depth extension of the ore body, there is still a part of the triangular ore body (in the stri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 陈星明张志贵苏华友谭宝会孙文勇
Owner SOUTHWEAT UNIV OF SCI & TECH
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