Method for intensified mining deep-dished strip mine

A technology of open-pit mine and section method, which is applied in surface mining, underground mining, special mining, etc. It can solve the problems of large amount of side expansion, slow decline of side expansion, and inability to solve the problem of stope depth extension

Inactive Publication Date: 2005-03-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of insufficient transportation capacity in the stope, the amount of side expansion is large

Method used

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  • Method for intensified mining deep-dished strip mine
  • Method for intensified mining deep-dished strip mine
  • Method for intensified mining deep-dished strip mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The first line has a width of 40 meters, with a total of 6 steps from -108m on the upper part to -180m on the lower part. In order to create more space for the bottom of the stope, the three steps of -120m, -132m, and -144m are combined into sections, and the three steps of -156m, -168m, and -180m are combined into sections. The slope angle of the steps after the section is 55 degrees, a 25m wide platform is left at the -144m level to prepare for the next strip mining.

[0012] The second strip has a width of 25 meters, and the upper step is from -72m to the lower part -180m, a total of 9 steps. In order to create more space for the bottom of the stope, three steps of -84m, -96m and -108m are combined, three steps of -120m, -132m and -144m are combined, and three steps of -156m, -168m and -180m are combined. The steps are merged, and the slope angle of the steps is 55 degrees after the merger. A 25m wide platform is left at the -144m level to prepare for the next strip...

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Abstract

The invention is a method for strengthening the mining of deep opencast pit, and its characteristic: it adopts strip mining method to make strip side expansion from inside to outside, where each strip is 20-60 m wide, retains the rest undigged, adopts a mode of combining vertical digging from top to bottom with horizontal digging, adopts a 2-4 stage combining mode as mining, reduces the number of steps, and increases side slope angle. By adopting strip mining method, it can advance the time of side expansion so as to use the side expansion to remedy the deficiency in the ore productivity in the stope bottom, thus making stable output transition on the deep opencast pit without reducing the output, able to enlarge the size of the stope bottom, creating the conditions of deepening the bottom stope for mine engineering, and reducing stocked ore.

Description

technical field [0001] The invention belongs to the field of mining, and in particular relates to a method for intensifying mining of deep concave open-pit mines. Background technique [0002] Most deep concave open-pit mines are designed and produced by staged mining. When the open-pit mine transitions from a small realm to a large realm, it is often affected by various factors such as insufficient vehicle transportation capacity, and the amount of expansion lags far behind the design requirements. Compared with the design, the amount of side expansion lags behind, resulting in smaller and smaller dimensions of the bottom of the stope and more and more crushed ore. The existing deep concave open-pit mine side expansion method is from top to bottom, which is basically a single step operation, descending level by level, and reaching the final level at one time. In the case of insufficient transportation capacity in the stope, the amount of side expansion is large and the spe...

Claims

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Application Information

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IPC IPC(8): E21C41/26
Inventor 李军财蔡美峰
Owner UNIV OF SCI & TECH BEIJING
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