A separate mining and filling mining method for steeply inclined ultra-thin veins with upper and lower cut walls

Abstract

The invention discloses a mining method for separate mining and filling of steeply inclined extremely thin ore veins with upper and lower wall cutting ore rocks. The bottom-drawing space is excavated from the pedestrian ventilation patios on both sides along the upper boundary of the bottom column (15) to the inside of the ore block, and the middle section of the transport roadway ( 10) Excavate a number of downhill chutes (13) upwards near the footwall of the ore body as mine chutes, drill wall-cutting holes (4) in the wall-cutting surrounding rocks (8) of the upper and lower walls respectively, and drill holes in the ultra-thin veins (1) In the ore-falling hole (9), pre-splitting holes (3) are drilled on the ore-rock contact surface (2), and the upper and lower wall wall-cut surrounding rocks (8) after the collapse form a waste rock filling body (6), which is then cemented with tailings Filling to form a tailings cemented filling body (5), and then implement the pre-splitting hole (3) and the ore-falling hole (9) at the same time differential blasting, the pre-splitting hole (3) is blasted ahead of the ore-falling hole (9), and a small scraper is used Or the electric rake transports the ore to the drop shaft (13) along the way, and then transports it to the bottom of the well by the middle section of the transport roadway (10). The invention improves the strength of the mixed filling body, realizes the purpose of controlling the deformation of surrounding rocks, and utilizes the tailing sand cemented filling body (5) as an ore falling platform to avoid secondary dilution of ore.

Description

technical field [0001] The invention belongs to the technical field of underground mine mining, and in particular relates to a method for filling and mining thin veins, which is particularly suitable for layered filling and mining of extremely thin veins with a steep slope of less than 0.8 meters in thickness and a dip angle of ≥ 65°. Background technique [0002] Generally, the occurrence conditions of ultra-thin veins are more complex. Data analysis shows that the current domestic mining methods for ultra-thin veins mostly use the comprehensive method, ore-retaining mining method, wall cutting and filling mining method and their deformation schemes, and other mining methods are used less. There is a considerable gap. Common problems in mining such ore bodies are: low degree of mechanization, high labor intensity, low stope production capacity, high loss and dilution rate, and potential safety hazards. [0003] In my country's metal mines, thin veins occupy a certain propo...

AI Technical Summary

Problems solved by technology

[0002] Generally, the occurrence conditions of extremely thin veins are more complicated

Data analysis shows that the current domestic mining methods for ultra-thin veins mostly use the comprehensive method, ore-retaining mining method, wall cutting and filling mining method and their deformation schemes, and other mining methods are used less. There is a considerable gap. Common problems in mining such ore bodies are: low degree of mechanization, high labor intensity, low stope production capacity, high loss and dilution rate, and potential safety hazards, etc.

[0005] (1) The location of the secondary rock drilling operation of the ore lode is located at the boundary of the surrounding rock of the hanging wall or the footwall, resulting in low drilling efficiency, and the blasting effect of the secondary ore fall is poor due to the clamping effect;

[0006] (2) Although the ore body and surrounding rock were blasted in stages, separate mining of the ore and rock was not achieved, resulting in a high ore dilution rate;

[0007] (3) The waste rock is completely used to fill the goaf, and the effect of controlling the deformation of the surrounding rock is poor

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