CN109630116B - Mining method for inclined medium-thickness blind ore body - Google Patents

Abstract

The invention is a mining method of inclined medium-thick blind ore body, which regards the whole ore body as a ore block, the height of the ore block is the full height of the ore body, the width of the ore block is the strike length of the ore body, and no ore pillar is left in the ore block. From the transport tunnel every 5~10m, excavate the mine horizontal road to the bottom of the ore body, and excavate the ore ditch at the bottom of the ore body; 3~8m away from the boundary of the ore rock in the lower wall of the ore body, excavate the blind inclined shaft for rock drilling by pedestrians. The rock blind inclined shaft is connected to the return air lane; the track is set in the pedestrian rock drilling blind inclined shaft, and the hoist is set in the return air lane, and the hoist controls the rail cage to move up and down in the pedestrian rock drilling blind inclined shaft through the wire rope. The workers drill into the ore body in the railed cage and drill the fan-shaped blastholes in layers, and blast the fan-shaped blastholes in layers. Beneficial effects: It replaces a large number of mining accuracy projects in the staged open-field mining method, saves the investment of mining accuracy projects, and has a simple process and high efficiency.

Description

A mining method of inclined medium-thick blind ore body

technical field

The invention belongs to the technical field of underground mining methods, and in particular relates to a mining method for inclined medium-thick blind ore bodies.

Background technique

Compared with other major mining countries in the world, my country's mineral resources have obvious occurrences of copper, iron and other bulk mineral resources. The quantity of bulk mineral resources such as copper and iron is relatively insufficient, and rare minerals such as tungsten and antimony are abundant in mineral resources. Many other features. The special situation of resource occurrence in my country determines that small blind ore bodies that are not specified in the geological map are often found next to the main ore bodies in the production of mining enterprises. In the inclined medium-thick orebodies, the segmented open-field method is mostly used for mining, and a large number of mining projects are required to be arranged in the sub-segmented open-field mining. Because the inclined medium-thick blind orebodies have small strike extension and short inclination extension, these mining standards The project cannot be reused, and it is often useless once used, which increases the cost of ore body development. Therefore, it is necessary to find a mining method suitable for inclined medium-thick blind ore bodies.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a mining method for inclined medium-thick blind ore body in order to reduce mining cost and improve mining efficiency.

The technical scheme of the present invention is: an inclined medium-thick blind ore body mining method, the method is suitable for the inclined medium-thick blind ore body with a strike length of less than 100m, a dip extension of less than 50m, and a stable upper and lower wall surrounding rock, and the technical scheme is as follows:

A structural parameters: When such an ore body is found, after the prospecting confirms the strike length, burial depth, extension depth, shape, dip angle and thickness of the ore body, the entire ore body is regarded as a ore block, and the height of the ore block is the ore block. The full height of the ore block, the width of the ore block is the length of the ore body trend, and no ore pillars are left in the ore block;

B Mining and cutting project: First, excavate the ore outgoing horizontal roadway from the transport roadway to the bottom of the ore body at intervals of 5-10m, and excavate the ore ditch at the bottom of the ore body; The rock blind inclined shaft and pedestrian rock drilling blind inclined shaft are connected to the return air lane; the track is set in the pedestrian rock drilling blind inclined shaft, and the hoist is set in the return air lane. move;

C mining and mining project: workers drill layered fan-shaped blastholes into the ore body in the rail cage, layered blasting and layered fan-shaped blastholes, and the caving ore is transported from the mining trench by the scraper through the mining horizontal lane. Roadway out.

In order to further save the amount of explosives, reduce the mixing of waste rock, and in order to protect the pedestrian rock drilling blind inclined shaft from being damaged, when charging the fan-shaped blasthole in layers, only the blasthole section in the ore body is charged, and the blasthole section in the surrounding rock is charged. Do not charge.

The beneficial effects of the present invention are: the method replaces a large number of mining accuracy engineering in segmented open-field mining by lifting and lowering the cage in the pedestrian rock drilling blind inclined shaft, saves the investment of mining accuracy engineering, and has the advantages of simple process and high efficiency.

Description of drawings

1 is a schematic diagram of the mining method of the present invention;

Reference symbols in the figure: 1-transport roadway, 2-exit horizontal roadway, 3-exit mining trench, 4-pedestrian rock drilling blind inclined shaft, 5-air return road, 6-track, 7-hoist, 8- Steel wire rope, 9-railed cage, 10-layered chisel fan hole, 11-caving ore.

Detailed ways

The deep copper mine of Baiyin Company is a well-known large-scale copper deposit. There are often scattered blind small ore bodies exposed beside the main ore body in the deposit. The main ore body of the deep copper mine adopts the subsection caving method without bottom pillar, and the blind ore body adopts the subsection empty field method. The segmented open field method needs to excavate a large number of mining projects when mining the remote blind ore body of the mine, which increases the mining cost. Therefore, the mine has tested the mining method of the inclined medium-thick blind ore body according to the present invention in the mining of the 9# blind ore body in the middle section of 1785m in the western mining area. The method is described in detail with reference to the accompanying drawings:

A structural parameters: for the 9# blind ore body, the 9# blind ore body has a dip angle of 45°, the ore body thickness is 8m, and the ore body height is 30m. When mining, the entire 9# blind ore body is regarded as a ore block, and the ore block height is The overall height of the body is 30m, the width of the ore block is 80m and the length of the ore body is 80m, and there are no ore pillars in the ore block.

B mining quasi-cutting project: First, the 1785m middle section of the transport roadway 1 is excavated every 5m from the ore lateral roadway 2 to the bottom of the 9# blind ore body; The angle of the cutting ditch is 45°; the pedestrian rock drilling blind inclined shaft 4 is excavated at 8m outside the boundary of the ore rock in the lower wall of the 9# blind ore body. The pedestrian rock drilling blind inclined shaft 4 is 43m long and has an inclination angle of 45°, and returns to 1785m in sections. The air lane 5 is connected; the track 6 is set in the pedestrian rock drilling blind inclined shaft 4, and the hoist 7 is set in the 1785m section return air lane 5. move.

C mining and mining project: people drill into the 9# blind ore body in the rail cage 9, and drill the fan-shaped blast hole 10 in layers, the hole depth is 16~25m, and blast the fan-shaped blast hole 10 layer by layer, and the caving ore 11 is transported by shovel The machine is transported out of the transport tunnel 1 from the mining trench 3 through the mining lateral lane 2.

In order to further save the material cost, when the 10-layer blasting fan-shaped blasting hole is drilled in layers, only the blasting hole section in the 9# blind ore is charged, and the blasting section in the surrounding rock is not charged. This treatment not only ensures the blasting effect, but also saves money. amount of explosives.

Claims (2)

1. The mining method of the inclined medium-thickness blind ore body is suitable for the inclined medium-thickness blind ore body with the strike length of less than 100m, the inclined extension of less than 50m and the stable surrounding rocks of upper and lower plates, and the technical scheme is as follows:

structural parameters A: when such ore body is found, after the trend length, the burial depth, the extension depth, the shape, the inclination angle and the thickness of the ore body are confirmed through prospecting, the whole ore body is regarded as an ore block, the height of the ore block is the full height of the ore body, the width of the ore block is the trend length of the ore body, and no ore pillar is left in the ore block;

b, mining and cutting engineering: firstly, excavating ore removal cross roadways (2) to the bottom of an ore body from a transportation roadway (1) at intervals of 5-10 m, and excavating ore removal trenches (3) at the bottom of the ore body; tunneling a pedestrian rock drilling blind inclined shaft (4) at a position 3-8 m away from the boundary of ore body footwall ore rocks, wherein the pedestrian rock drilling blind inclined shaft (4) is communicated with an air return tunnel (5); a track (6) is arranged in the pedestrian rock drilling blind inclined shaft (4), a winch (7) is arranged in the return airway (5), and the winch (7) controls the rail cage (9) to move up and down in the pedestrian rock drilling blind inclined shaft (4) through a steel wire rope (8);

c, stoping and ore drawing engineering: workers drill fan-shaped blast holes (10) in a layered mode into a mine body in a rail cage (9), the fan-shaped blast holes (10) are drilled in a layered mode through layered blasting, and collapsed ores (11) are conveyed out of a haulage roadway (1) from an ore removal trench (3) through an ore removal cross drift (2) through a scraper.

2. The mining method of the inclined medium-thickness blind ore body according to claim 1, wherein the mining method comprises the following steps: when the layered drilling fan-shaped blast holes (10) are charged, only the blast hole sections in the ore body are charged, and the blast hole sections in the surrounding rocks are not charged.

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