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Presplitting type wall cutting and filling stoping method for thin ore vein

A backfill mining method, a technology of thin ore veins, applied in the fields of backfill, surface mining, mining equipment, etc., can solve the problems of increasing crushing cost and lifting pressure, increasing tailings discharge pressure, worsening beneficiation process indicators, etc., to reduce tailings. The effect of stacking pressure, reducing crushing and improving beneficiation process indicators

Inactive Publication Date: 2016-07-06
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A high dilution rate not only increases the crushing cost and lifting pressure, but also deteriorates the beneficiation process indicators and increases the tailings discharge pressure

Method used

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  • Presplitting type wall cutting and filling stoping method for thin ore vein
  • Presplitting type wall cutting and filling stoping method for thin ore vein
  • Presplitting type wall cutting and filling stoping method for thin ore vein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 , image 3 with Figure 4 , first use the pre-splitting blasting technology to collapse the surrounding rock and fill it on the spot, and then collapse the ore body (vein)

[0024] After the bottoming of the ore block is completed, the surrounding rock is firstly collapsed (according to the stability of the surrounding rock, the surrounding rock of the upper wall can be collapsed, and the surrounding rock of the lower wall can also be collapsed). Construct pre-splitting holes along the ore-rock interface according to the requirements of pre-splitting blasting. The distance between the pre-splitting holes is 8 to 12 times the diameter of the blast hole, and there is no charge or less charge. The thickness of the collapsed surrounding rock is determined according to the minimum working face space requirements of the ore block (stope), and the blasting parameters of the surrounding rock are designed according to the normal stope blasting. The pre-splitting...

Embodiment 2

[0027] see figure 2 , image 3 with Figure 5 , first use the pre-splitting blasting technology to caving the ore body (vein), after the ore is out, then caving the surrounding rock and filling it on the spot

[0028] If the thickness of the ore body (vein) exceeds 0.8 to 1m, the ore body (vein) can also be collapsed first after the work of pulling the bottom of the ore block is completed. Construct pre-splitting holes along the ore-rock interface according to the requirements of pre-splitting blasting. The distance between the pre-splitting holes is 8 to 12 times the diameter of the blast hole, and there is no charge or less charge. The blasting parameters of the ore body (vein) are designed according to the normal stope blasting. The pre-splitting hole is detonated at the same time as the caving hole (main blast hole) of the ore body (vein), and the pre-splitting hole is detonated before the main blast hole to form a pre-crack, which reduces the impact of the detonation...

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Abstract

The invention discloses a presplitting type wall cutting and filling stoping method for a thin ore vein. The presplitting type wall cutting and filling stoping method for the thin ore vein comprises the steps that a presplitting hole is drilled in the interface of the thin ore vein and surrounding rock on the hanging side or heading side of the wall to be cut, presplitting blasting is conducted, the ore vein and the surrounding rock of the cut wall are blasted at different times, and ore drawing or filling is conducted independently; and all the steps are circulated till a whole ore block is extracted. Simultaneous millisecond blasting is conducted on the presplitting hole and an ore body blasted in the early stage or the surrounding rock of the cut wall, namely the presplitting hole is blasted firstly and then the ore body or the surrounding rock of the cut wall is blasted. After ore drawing (under the condition that mining is conducted firstly) or filling (under the condition that wall cutting is conducted firstly), secondary blasting of the surrounding rock is conducted for on-site filling or the ore body is blasted for ore drawing. All the steps are circulated till the whole ore block is extracted. According to the presplitting type wall cutting and filling stoping method for the thin ore vein, by introducing the presplitting blasting technique into the wall cutting and filling method, separate stoping of ore and wall rock of the thin ore vein is achieved in the true sense, the dilution rate of extraction of the thin ore vein is greatly decreased, and the probability of breakage and cost increase which are caused by excessive dilution of ore is lowered; in addition, the mineral separation technological index can be improved easily, the tailing stacking pressure is relieved, and high economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to a non-coal underground mining method, in particular to a safe and high-efficiency mining method for separating ore and rock with a low dilution rate and applicable to thin veins. Background technique [0002] Many gold deposits and non-ferrous metal deposits belong to extremely thin to thin veins. Due to the small mining width of these veins, in order to ensure sufficient working space, wall cutting and filling methods are generally used for back mining. Ordinary wall-cutting filling method inevitably collapses the hanging wall or footwall of the ore vein at the same time, resulting in serious ore depletion. The ore depletion rate is as high as 30-50%, and even some mines have an ore depletion rate of over 80%. Even if the surrounding rock of the vein and hanging wall (or footwall) is blasted in stages (that is, separate mining), it is easy to cause high dilution due to the small thickness of the vein. A high dilution rate not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/22E21F15/00F42D3/04E21F13/06
CPCE21C41/22E21F15/00F42D3/04
Inventor 王新民张钦礼潘常甲刘恒亮张德明田明华赵建文陈秋松柯愈贤杨力杨建
Owner CENT SOUTH UNIV
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