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Low dilution sublevel caving mining method of steep inclined medium thick orebody

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

Active Publication Date: 2018-07-06
ANSTEEL GRP MINING CO LTD
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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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  • Low dilution sublevel caving mining method of steep inclined medium thick orebody
  • Low dilution sublevel caving mining method of steep inclined medium thick orebody
  • Low dilution sublevel caving mining method of steep inclined medium thick orebody

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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 Chute 17 and roadway 15 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 16 roof of the mining approach along the vein and the footwall of the ore body according to the formula, and 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 Apparent discharge angle of ore, °;

[0030...

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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 Applications(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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