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A low-loss and sub-cave mining method for steeply inclined medium-thick ore bodies

A segmented caving and thick ore body technology, applied in surface mining, underground mining, special mining, etc., can solve problems such as the impact of mining blasting, achieve the effects of reducing the large block rate, improving mining economic benefits, and improving ore recovery conditions

Active Publication Date: 2019-08-27
ANSTEEL GRP MINING CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] The existing problem is: the current production actual loss rate and dilution rate values ​​are still much larger than the theoretical values, and the reason is mainly caused by the impact of mining blasting

Method used

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  • A low-loss and sub-cave mining method for steeply inclined medium-thick ore bodies
  • A low-loss and sub-cave mining method for steeply inclined medium-thick ore bodies
  • A low-loss and sub-cave mining method for steeply inclined medium-thick ore bodies

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Embodiment Construction

[0025] Such as Figure 2-4 As shown, a low-loss segmental caving mining method of a steeply inclined medium-thick ore body of the present invention includes segmental mining of the ore body in the stage from top to bottom, arranging footwall transport roadways in segments, ore drawing The chute 17 and the connecting roadway 16 through the veins are characterized in that: comprise the following steps:

[0026] (1) Determine the position of the recovery route along the vein

[0027] Calculate the horizontal distance between the central line of the 15th roof and the ore body footwall of the mining approach along the vein according to the formula, and then excavate the mining approach along the vein,

[0028] d=(H-h)(cotα-cotθ)

[0029] In the formula, d-horizontal distance from the center line of the roof of the approach to the footwall of the ore body, m, H-segment height, m; h-height of the mining approach, m; α-inclination angle of the ore body footwall, °, θ-caving Apparen...

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Abstract

The invention relates to a low dilution sublevel caving mining method of steep inclined medium thick orebody. The mining method comprises the stage of mining the orebody from top to bottom in sections, a lower side wall transportation road, a ore drawing chute and a vein crossing roadway. The method comprises the following steps of, determining the position of a vein mining approach; driving a cutting lane to an upper wall boundary of an orebody and a cutting well in a route along a vein; arranging upward parallel blast holes in the cutting lane, and blasting row by row to form a cutting groove; arranging an upward fan-shaped hole in the route along the vein, wherein a short blast hole of 2 - 4m is arranged in the lower side wall. The sequence of initiation of fan-shaped holes is that, blasting the lower side wall side hole first and then blasting the upper side wall side hole to reduce accumulation of blasting gas and the size of blasting cavity; pouring the ore after blasting into the ore drawing chute through the vein connection tunnel and transporting it out through the stage transportation system. The method has the advantages of improving the ore recovery rate and reducing the ore dilution rate.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a low-loss sub-caving mining method of a steeply inclined medium-thick ore body. Background technique [0002] In the underground mining of metal deposits, steeply inclined medium-thick ore bodies account for about 20%. When using the segmented caving method to mine steeply inclined medium-thick ore bodies, the stope structure of the along-vein mining approach is usually adopted. The position selection of the along-vein approach in the vertical direction and the horizontal direction has a great impact on ore loss and dilution. [0003] Existing technology: In recent years, the horizontal position and section height of the mining approach have been determined based on the principle that the shape of the ejected body is consistent with the overall shape of the caving body + residual body, which has effectively alleviated ore loss and dilution. [0004] The existing prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/22
Inventor 宫国慧郭海涛任凤玉马东付煜郑海峰高常胜李君
Owner ANSTEEL GRP MINING CO LTD
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