Medium deep hole presplitting blasting mining method of steeply inclined thin-to-ultrathin-lode ore body

Abstract

The invention discloses a medium deep hole presplitting blasting mining method of a steeply inclined thin-to-ultrathin-lode ore body. A stope drift along a lode and a layered rock drilling drift in the lode are excavated in the ore body lode along the trend; during ore break down and rock drilling blasting in each time, a pre-splitting blast hole in a hanging side ore and rock boundary surface inan inclination direction of the ore body is drilled along a hanging side ore and rock boundary line in the stope drift or the layered rock drilling drift, and a pre-splitting blast hole in a heading side ore and rock boundary surface in the inclination direction of the ore body is drilled along a heading side ore and rock boundary line in the stope drift or the rock layered drilling drift; and theore rock within about 2 to 4 m along the stope trend at a current layer is enabled to be cut during each time of pre-splitting blasting. The medium deep hole presplitting blasting mining method of the steeply inclined thin-to-ultrathin-lode ore body breaks through the applicable ore body thickness boundary of a stage room mining method, and thereby can be applied to mining of the steeply inclinedthin-to-ultrathin-lode ore body; rock drilling and ore break down on a muck pile under a suspended ceiling when a waste-lifting filling ore mining method or a shrinkage method is used are avoided; the safety of operators is improved; and large-scale and high-efficiency flat-bottom structure ore removal by a method similar to the stage room mining method and by using a carry-scraper or a muck loader can be realized.

Description

technical field [0001] The invention belongs to the technical field of mining, in particular to a medium-deep hole pre-splitting blasting mining method for steeply inclined thin-vein to extremely thin-vein ore bodies. Background technique [0002] Generally, wall cutting and filling mining method or shallow hole ore retention method are adopted to mine ore bodies with an inclination angle of 55° and above, extremely thin to thin veins, and stable to moderately stable surrounding rocks. When the ore body is buried deep or close to the ground, the surrounding rock roof is prone to unpredictable delamination, collapse and roof fall under the action of high ground pressure or the broken and loose belt near the ground, which not only endangers the suspended roof The safety of ore falling by rock drilling and blasting, and large-area roof collapse often occur in the process of large-scale concentrated ore extraction, resulting in serious dilution of ore ore, and even cannot be rel...

AI Technical Summary

Problems solved by technology

When the ore body is buried deep or close to the ground, the surrounding rock roof is prone to unpredictable delamination, collapse and roof fall under the action of high ground pressure or the broken and loose belt near the ground, which not only endangers the suspended roof Drilling and blasting the safety of ore falling, and in the process of large-scale concentrated ore extraction, the roof often collapses in a large area, resulting in serious dilution of the ore, and it is even impossible to release the ore.

The existing steep-inclined and thin-vein medium-deep hole mining technology basically uses optimized blasting parameters to reduce the blasting clamping force, reduce the unit consumption of explosives, and damage the surrounding rock, which not only cannot avoid blasting damage to the surrounding rock roof, It causes the roof surrounding rock to collapse during the mining process and seriously dilutes the ore, and the effect of reducing the unit consumption of explosives is very limited

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