Method for mining the lower edge of a high cut and fill trench

Abstract

The method for stoping the edge ore body of the lower wall of a high cut and groove comprises the following steps: constructing a vein outside connecting lane to the upper and lower walls of the ore body from the vein outside transportation lanes of the upper and lower walls respectively; constructing a drawing bottom and ore receiving lane along the length of the stope at the center of the bottom of the stope; constructing the same direction ore loading access from the lane to the two sides of the stope; constructing a large diameter deep hole drilling connecting lane along the length direction of the stope at the center of the top of the stope; constructing a large hole drilling lane from the lane to the two sides of the stope to the stope boundary; constructing a large diameter deep hole from the top of the stope to the drawing bottom and ore receiving lane at the bottom of the stope; performing charging and blasting of the large diameter deep hole outside the vein of the lower wall; the waste rock blasted and collapsed from the large diameter deep hole outside the vein of the lower wall is transported out from the ore loading access, and the waste rock is transported out to stop the edge ore body of the lower wall; a large diameter deep hole is constructed from the large hole drilling lane at the top of the stope to the junction of the ore body and the surrounding rock of the lower wall, the large diameter deep hole is blasted in a descending stepwise manner to form a cutting groove in the central area of the stope, the stope is blasted from the center to the two ends, the ore is transported out through the ore loading access in the drawing bottom and ore receiving lane, and the method has the advantages of convenient implementation, economy, high efficiency and the like.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and in particular to a method for mining the lower wing ore body in a high trench. Background Technology

[0002] Currently, in the mining of thick, dipping to steeply dipping ore bodies and thick, horizontal to gently dipping ore bodies in metal mines, the primary method is large-diameter deep-hole stage open-cut mining. After the main ore body and hanging wall flank ore bodies are mined, how to economically and efficiently mine the remaining footwall flank ore bodies is a major challenge faced by most mines. Because footwall flank ore bodies vary in shape, it is even more difficult to economically and efficiently mine non-flat, economically valuable footwall flank ore bodies using existing engineering without adding sublevel or secondary subgrade engineering.

[0003] In summary, existing conventional mining techniques cannot achieve economical and efficient mining of irregular footwall wing ore bodies without the addition of sub-sections or secondary intermediate sections.

[0004] Therefore, developing a method for mining the lower flank ore body in a high trench is of great significance. Summary of the Invention

[0005] The objective of this invention is to overcome the shortcomings of the prior art and provide a method for mining the footwall flank ore body in high trenches. This method utilizes existing engineering techniques to mine this type of footwall flank ore body, making it economical and efficient.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] The specific technological steps and conditions for mining the lower flank orebody in Gaoqiangou are as follows:

[0008] A. Construct external connecting tunnels from the upper and lower hanging wall external transport tunnels to reach the upper and lower hanging wall of the ore body;

[0009] B. Construct a bottom-pull and ore-receiving roadway along the length of the mining area at the center of the bottom of the mining area, and construct ore loading routes in the same direction from the bottom-pull and ore-receiving roadway to both sides of the mining area.

[0010] C. Construct a large-diameter deep-hole drilling connecting roadway along the length of the mining area at the center of the top of the mining area, and construct a certain number of large-hole drilling roadways from the drilling connecting roadway to both sides of the mining area to reach the boundary of the mining area.

[0011] D. Drill large-diameter deep holes from the rock-drilling connecting roadway at the top of the stope to the bottom-pulling and receiving roadway at the bottom of the stope. Using the bottom-pulling and receiving roadway as the free face, charge and blast all large-diameter deep holes outside the footwall vein. Do not charge large-diameter deep holes inside the ore body.

[0012] E.All waste rock of large-diameter deep-hole blasting collapse outside the lower disc is transported out by the self-loading route of the scraper, and the waste rock needs to be completely removed before the lower disc wing ore body is recovered;

[0013] F.The large-diameter deep hole is constructed from the large hole drilling roadway 7 at the top of the stope to the junction of the ore body and the lower disc surrounding rock, and the stope after the lower disc surrounding rock blasting is a free surface. A cutting groove of a certain width is formed by the large-diameter deep-hole blasting from the bottom to the top in multiple times in the central area of the stope, and then the cutting groove is taken as the free surface, and the stope is blasted from both ends in multiple times, and the blasted ore is transported out through the loading route by the scraper in the mine roadway;

[0014] G.The stope is filled after recovery.

[0015] Compared with the prior art, the present application has the following advantages or effects:

[0016] Because the stope structure arrangement is simple, the implementation is convenient, economical and efficient; at the same time, due to the strong combination of large-diameter deep-hole ore falling and high-cutting-gully ore receiving, the non-flat lower disc wing ore body with economic value is economically and efficiently mined without increasing the sublevel or auxiliary sublevel engineering, so that the production capacity and resource recovery rate of the edge and corner ore body are effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the stope front view schematic diagram of the method of recovering the lower disc wing ore body by the high-cutting-gully according to the present application.

[0018] Figure 2 is Figure 1 the stope side view schematic diagram.

[0019] Figure 3 is the stope bottom ore removal structure schematic diagram. Figure 1

[0020] Figure 4 is the stope top cutting engineering layout schematic diagram. Figure 1

[0021] In the drawings, various identifiers respectively represent:

[0022] 1. Upper disc outside air return roadway 2. Lower disc outside transportation roadway 3. Outside connecting roadway 4. Stope bottom receiving mine roadway 5. Ore loading route 6. Drilling connecting roadway 7. Large hole drilling roadway 8. Large-diameter deep hole 9. Lower disc surrounding rock 10. Collapsed ore

[0023] The present application will be further described in detail below in combination with the drawings. DETAILED DESCRIPTION

[0024] As Figures 1 to 4 ​​As shown, the method for mining the footwall flank orebody in Gaoqiangou addresses the problem of economically and efficiently mining irregular footwall flank orebody without increasing the number of sub-sections or secondary subgrades. The specific technological steps and conditions are as follows:

[0025] A. Construct external connecting tunnels 3 from the upper hanging wall external transport tunnel 1 and the lower hanging wall external transport tunnel 2 respectively to reach the upper and lower hanging walls of the ore body;

[0026] B. Construct a bottom-pulling and ore-receiving roadway 4 along the length of the mining area at the center of the bottom of the mining area, and construct ore loading access roads 5 in the same direction from the bottom-pulling and ore-receiving roadway 4 to both sides of the mining area.

[0027] C. Construct a large-diameter deep-hole drilling connecting roadway 6 along the length of the mining area at the center of the top of the mining area, and construct a certain number of large-hole drilling roadways 7 from the drilling connecting roadway 6 to both sides of the mining area to reach the boundary of the mining area.

[0028] D. Drill large-diameter deep holes 8 from the rock-drilling connecting roadway 6 at the top of the mining area to the bottom-pulling and receiving roadway 4 at the bottom of the mining area. Using the bottom-pulling and receiving roadway 4 as the free face, charge and blast all large-diameter deep holes 8 outside the footwall vein. Do not charge large-diameter deep holes 8 inside the ore body.

[0029] E. All waste rock from the blasting of large-diameter deep holes 8 outside the footwall vein is transported out through the self-loading ore inlet 5 of the loader. The footwall side wing ore body is to be mined again only after all the waste rock has been removed.

[0030] F. From the top of the mining area, a large-diameter deep hole 8 is drilled through the large-hole rock drilling roadway 7 to reach the junction of the ore body and the footwall 9. The goaf area after the footwall blasting is used as the free face. In the central area of ​​the mining area, a cutting groove of a certain width is formed by multiple blasts from bottom to top in the form of a step-like method using a large-diameter deep hole. Then, using the cutting groove as the free face, blasting is carried out from the center of the mining area to both ends in stages. The ore 10 after blasting is transported out through the loading roadway 5 by a loader in the bottom-pulling and receiving roadway 4.

[0031] G. After the mining area is recovered, the goaf is filled.

[0032] The process of the present invention can be further described as follows:

[0033] The upper plate external transport roadway 1, the lower plate external transport roadway 2, the bottom pull-and-receive ore roadway 4, and the ore loading access roadway 5 at the bottom of the mining area are all arranged in the lower plate surrounding rock.

[0034] The trench height extends from the top of the bottom roadway at the bottom of the mining area to the junction of the footwall and the surrounding rock.

[0035] The two sides of the trench should be flexibly arranged according to the interface of the surrounding rock of the mine, and the slope of the two sides of the trench should not be less than the natural angle of repose of the ore in this mine.

[0036] The trench full height is formed by large diameter deep hole 8 blasting, and the trench width is 3-6m;

[0037] The ore loading approach 5 is obliquely intersected with the draw bottom and receiving ore roadway 4 at 45-60°, and the ore loading approaches 5 of the bottom of adjacent each stope are in a straight line through each other, which facilitates the shovel loader to play the ore loading efficiency and avoids that the shovel loader cannot efficiently shovel and load the ore due to the too short ore loading approach;

[0038] The stope top is formed by the rock drilling communication roadway 6 and the large hole rock drilling roadway 7, which can realize the vertical and parallel arrangement of the large diameter deep hole 8, effectively reduces the stope boulder rate, and maintains the roof at the same time.

[0039] Embodiment

[0040] A copper and zinc metal mine of a certain copper company in Xinjiang recovers the ore body at the elevation of 300-350m, the ore body has a strike length of 200-300m, the average thickness of the ore body is 30-60m, the ore body has an inclination of 70°-90°, and belongs to an acute inclined thick and large ore body. Most of the main ore body has been recovered, and a large amount of ore body exists in the lower wing. The lower wing ore body has different shapes, and for the non-flat and economically valuable lower wing ore body, the following steps are taken to utilize the existing project without increasing the sublevel or auxiliary sublevel engineering:

[0041] Step one: the out-of-vein communication roadway 3 is constructed from the 15 exploration line position of the upper disc out-of-vein transportation roadway 1 and the lower disc out-of-vein transportation roadway 2 of the 300m sublevel to reach the upper and lower discs of the 1501 stope, and the cross section of the out-of-vein communication roadway 3 is 4.2m×3.1m;

[0042] Step two: the draw bottom and receiving ore roadway 4 is constructed in the center of the 1501 stope bottom along the length direction of the stope, and the cross section of the roadway is 4.2m×3.1m. The ore loading approach 5 in the same direction is constructed from the draw bottom and receiving ore roadway 4 to the two sides of the stope, and the ore loading approach short circuit is connected with the ore loading approach of the adjacent 1401 stope and 1601 stope, and the cross section of the ore loading approach 5 is 4.2m×3.1m;

[0043] Step three: the large diameter deep hole rock drilling communication roadway 6 is constructed in the center of the 1501 stope top along the length direction of the stope, and the cross section of the rock drilling communication roadway 6 is 4.2m×3.8m. A certain number of large hole rock drilling roadways 7 are constructed from the rock drilling communication roadway 6 to the two sides of the stope to reach the stope boundary, and the cross section of the large hole rock drilling roadway 7 is 4.0m×3.8m;

[0044] Step four: from the top of the 300m section 1501 mining face of the drill roadway 6, a large diameter deep hole 8 is constructed to the bottom of the draw bottom and ore roadway 4, the large hole diameter is 165mm. The draw bottom and ore roadway 4 is a free surface, all large diameter deep holes 8 outside the lower lode are charged and blasted, and the large diameter deep holes 8 in the ore body are not charged. Below the 320m elevation of the 300m section 1501 mining face, there is tuff, and above the 320m elevation, there is a recoverable copper-zinc ore;

[0045] Step five: the waste rock blasted and collapsed by all large diameter deep holes 8 outside the lower lode (below the 320m elevation) is transported out through the shovel loader self-loading access 5, and the waste rock needs to be completely removed before the lower lode wing ore body is recovered (above the 320m elevation is a recoverable copper-zinc ore).

[0046] Step six: from the large hole drill roadway 7 at the top of the mining face, a large diameter deep hole 8 is constructed to the junction of the ore body and the lower wall rock 9, and the mined-out area after blasting of the lower wall rock is a free surface. In the central area of the mining face, a certain width of cutting groove is formed by blasting in multiple times from bottom to top in a large diameter deep hole step descending manner, and then the cutting groove is a free surface, and the mining face is blasted from both ends in multiple times, and the blasted ore 10 is transported out through the draw bottom and ore roadway 4 through the loading access 5.

[0047] Step six: after the mining face is recovered, the mined-out area is filled.

[0048] Among them, the upper lode outside the transport roadway 1 at the bottom of the mining face, the lower lode outside the transport roadway 2, the draw bottom and ore roadway 4, and the loading access 5 are arranged in the lower wall rock 9;

[0049] Among them, the ditch height is from the draw bottom roadway roof at the bottom of the mining face to the lower lode wall rock junction;

[0050] Among them, the two sides of the ditch need to be flexibly arranged according to the ore wall rock interface, and the slope of the two sides of the ditch is not less than the natural angle of repose of the ore in the mine;

[0051] Among them, the ditch full height is formed by blasting of the large diameter deep hole 8, and the ditch width is 4m;

[0052] Among them, the loading access 5 and the draw bottom and ore roadway 4 are obliquely intersected at 45°, and the loading accesses 5 at the bottoms of adjacent mining faces are in a straight line through each other, which is convenient for the shovel loader to play the loading efficiency and avoids that the shovel loader cannot efficiently shovel and load the ore due to too short loading access;

[0053] Among them, the top of the mining face forms a regular point column through the drill roadway 6 and the large hole drill roadway 7, which can realize vertical and parallel arrangement of the large diameter deep hole 8 while maintaining the roof, and effectively reduces the large block rate of the mining face.

[0054] The application can be realized as above. The above embodiment is only the best mode of the application, but the embodiment of the application is not limited by the above embodiment, and other changes, modifications, replacements, combinations, simplifications, which are not deviated from the spirit and principles of the application, should be equivalent replacement modes, and all are included in the protection scope of the application.

Claims

1. A method of mining the lower edge limb of a high cut and fill stope, characterised by The specific process steps and conditions are as follows: A. From the upper disc vein outside transportation lane (1) and the lower disc vein outside transportation lane (2), the vein outside connecting lane (3) is constructed to reach the upper and lower disc of the ore body; B. The bottom of the stope is constructed along the length direction of the stope to form the drawing bottom and ore receiving roadway (4), and the ore loading approach (5) is constructed in the same direction from the drawing bottom and ore receiving roadway (4) to the two sides of the stope; C. The large-diameter deep hole drilling connecting lane (6) is constructed along the length direction of the stope at the top of the stope, and a certain number of large hole drilling roadways (7) are constructed from the drilling connecting lane (6) to the two sides of the stope to reach the stope boundary; D. The large-diameter deep hole (8) is constructed from the drilling connecting lane (6) at the top of the stope to reach the drawing bottom and ore receiving roadway (4) at the bottom of the stope, and the drawing bottom and ore receiving roadway (4) is taken as the free surface, and all the large-diameter deep holes (8) outside the lower disc vein are blasted, and the large-diameter deep holes (8) in the ore body are not charged; E. The waste rock blasted and collapsed from all the large-diameter deep holes (8) outside the lower disc vein is transported out through the shovel loader from the ore loading approach (5), and the waste rock needs to be completely removed before the lower disc wing ore body is recovered; F. The large-diameter deep hole (8) is constructed from the large hole drilling roadway (7) at the top of the stope to reach the junction of the ore body and the lower disc surrounding rock (9), the stope after blasting of the lower disc surrounding rock is taken as the free surface, the cutting groove of a certain width is formed by blasting from bottom to top in the central region of the stope by large-diameter deep hole reverse benching, then the cutting groove is taken as the free surface, and the stope is blasted from the center to the two ends in several times, and the blasted ore (10) is transported out through the drawing bottom and ore receiving roadway (4) through the ore loading approach (5) by the shovel loader; G. The stope is recovered, and the stope is filled after the stope is recovered.

2. The method of claim 1, wherein The upper disc vein outside transportation lane (1), the lower disc vein outside transportation lane (2), the drawing bottom and ore receiving roadway (4), and the ore loading approach (5) at the bottom of the stope are arranged in the lower disc surrounding rock (9).

3. The method of claim 1, wherein The height of the trench is from the drawing bottom roadway roof at the bottom of the stope to the junction of the lower disc ore surrounding rock.

4. The method of claim 1, wherein The two sides of the trench need to be flexibly arranged according to the ore surrounding rock interface, and the slope of the two sides of the trench is not less than the natural angle of repose of the ore in the mine.

5. The method of claim 1 wherein The full height of the trench is formed by blasting of the large-diameter deep hole (8), and the width of the trench is 3-6m.

6. The method of claim 1 wherein The ore loading approach (5) and the drawing bottom and ore receiving roadway (4) are obliquely intersected at an angle of 45°-60°, and the ore loading approaches (5) at the bottoms of adjacent stopes are connected in a straight line, which is convenient for the shovel loader to load the ore efficiently and avoids that the shovel loader cannot efficiently load the ore due to too short ore loading approach.

7. The method of claim 1 wherein The stope top is formed by the drilling connecting lane (6) and the large hole drilling roadway (7) to form a regular point column, which can realize the vertical and parallel arrangement of the large-diameter deep hole (8) while maintaining the roof, and effectively reduces the stope boulder rate.

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