Mining method and mining structure for steeply inclined thin ore veins

Abstract

The present application provides a mining method and a mining structure for steeply inclined thin ore veins, which relates to the field of mining; the mining method includes dividing the ore vein into multiple stages, arranging a first shaft at intervals along the strike of the ore vein in each stage, dividing the ore vein between adjacent first shafts into ore blocks, adding a second shaft in the middle of the ore block, and the second shaft divides the ore block into two stopes; constructing a plurality of ore-drawing roadways at horizontal intervals along the ore-drawing roadway, and entering the level of the undercut roadway by climbing at the end of the ore-drawing roadway; constructing the undercut roadway and connecting the undercut roadway with each first shaft; constructing a plurality of drilling chambers at intervals, and in the same stope, the drilling chambers of the first shaft and the drilling chambers of the second shaft are constructed staggeredly up and down; constructing medium-deep blast holes in the ore body in the stope. The present application uses the undercut roadway as a free face, and the mining personnel construct in the staggeredly arranged drilling chambers up and down, avoiding the mining personnel from working under the exposed surface and improving the mining safety.

Description

Technical Field

[0001] The present application relates to the field of mining. Specifically, it relates to a mining method and a mining structure for steeply inclined thin ore veins. Background Art

[0002] The shrinkage stoping method is a widely used mining method in the mining process, especially suitable for the mining of steeply inclined thin ore vein ore bodies. In the prior art, the shrinkage stoping method mainly includes arranging shallow holes in the ore body, crushing the ore through blasting and then falling it into the stope, and then transporting the ore out of the stope through ore drawing funnels or other equipment. This method can effectively improve the ore recovery rate and has the characteristics of simple construction and low cost.

[0003] In practical applications, the shrinkage stoping method has been widely used in the mining operations of various mines. For example, in areas rich in metal mineral resources, the shrinkage stoping method is often used to mine precious metal ore bodies such as gold, silver, and copper. In addition, this method is also used in the mining of non-metallic minerals such as limestone and phosphate rock. Although the shrinkage stoping method has many advantages, it still faces some challenges in the actual operation process, such as ore crushing efficiency, stope ventilation conditions, and ore transportation problems.

[0004] In summary, as a mature mining technology, the shrinkage stoping method has played an important role in the mining of steeply inclined thin ore vein ore bodies, but it requires workers to operate under the roof of the exposed surface, with poor safety conditions. Levelling the stope and dealing with loose rocks, especially under the condition of relatively thick ore bodies, is a large workload and is carried out manually, with high labor intensity. Summary of the Invention

[0005] The purpose of the present application is to provide a mining method and a mining structure for steeply inclined thin ore veins, which can avoid miners operating under the roof of the exposed surface, improve the mining safety factor, and reduce the mining risk.

[0006] In the first aspect, the present invention provides a mining method for steeply inclined thin ore veins. The mining method for steeply inclined thin ore veins includes dividing the ore vein into multiple stages along the height direction of the ore vein, arranging first raises at intervals along the ore vein strike within each stage, dividing the ore vein between two adjacent first raises into ore blocks, adding second raises in the middle of the ore blocks, and the second raises dividing the ore blocks into two stopes;

[0007] Constructing multiple ore drawing roadways at horizontal intervals along the ore drawing roadway, and entering the level of the undercut roadway by climbing at the end of the ore drawing roadway, then constructing the undercut roadway along the ore body strike, and connecting the undercut roadway with each of the first raises;

[0008] Construct a plurality of rock drilling chambers at intervals along the extension direction of the first shaft, and construct a plurality of rock drilling chambers at intervals along the extension direction of the second shaft. In the same stope, the rock drilling chambers of the first shaft and the rock drilling chambers of the second shaft are constructed staggeredly up and down.

[0009] After the mining personnel enter the rock drilling chamber from top to bottom, medium-deep hole blast holes are constructed in the ore body in the stope through the rock drilling chamber, and the undercut roadway is used as the blasting free face for blasting.

[0010] In an alternative embodiment, a pedestrian return airway and a pedestrian return airway connecting lane are constructed along the strike of the ore vein at the top of each stage outside the vein, and the pedestrian return airway is connected to the first shaft and the second shaft through the pedestrian return airway connecting lane.

[0011] In an alternative embodiment, a transportation roadway is constructed along the strike of the ore vein at the bottom of each stage outside the vein, and the transportation roadway is constructed to be connected to the ore-drawing roadway. In an alternative embodiment, the rock drilling chambers in the second shaft are constructed in two rows, and the two rows of rock drilling chambers are symmetrically arranged along the extension direction of the second shaft. One row of rock drilling chambers tunnels towards one of the first shafts, and the other row of rock drilling chambers tunnels towards the other first shaft.

[0012] In an alternative embodiment, after the construction of the medium-deep hole blast holes is completed, blasting is carried out successively from bottom to top.

[0013] In an alternative embodiment, after each blasting, a muck pile is formed, and ore is evenly drawn from each position of the muck pile. After the even ore drawing, a free face for the blasting of the upper medium-deep hole blast holes is left, and the space left is 1.2 - 1.8 times the volume of the ore blasted in a single blast.

[0014] In an alternative embodiment, the steeply inclined thin ore vein mining method further includes: after the muck pile ore drawing is completed, a first intermediate pillar is formed at the first shaft, and a second intermediate pillar is formed at the second shaft.

[0015] In an alternative embodiment, after the second intermediate pillar is recovered first, a filling retaining wall is constructed on the rock drilling platform of the first shaft and the ore-drawing roadway to fill the mined-out stope.

[0016] In an alternative embodiment, after adjacent ore blocks are mined, short holes are drilled in the first intermediate pillar between the ore blocks for blasting recovery, and after the first intermediate pillar is recovered, a filling retaining wall is constructed at the bottom of the ore-drawing roadway.

[0017] In a second aspect, the present invention provides a mining structure for steeply inclined thin ore veins, based on the mining method for steeply inclined thin ore veins described in the foregoing embodiments. The mining structure for steeply inclined thin ore veins includes: an ore vein, a first shaft, a second shaft, an ore-drawing roadway, and a sill drifting roadway. The first shafts are arranged at intervals along the strike of the ore vein. The area between two adjacent first shafts is divided into ore blocks. The second shaft is arranged in the middle of the ore block and divides the ore block into two stopes. A plurality of drilling chambers are respectively arranged in the first shaft and the second shaft. In the same stope, the drilling chambers in the first shaft and the drilling chambers in the second shaft are arranged vertically offset from each other. The ore-drawing roadway is arranged at the ore-drawing roadway level. The sill drifting roadway communicates with the first shaft and the ore-drawing roadway.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] In the present application, with the sill drifting roadway as the free face, miners stand in the vertically offset drilling chambers to construct medium-deep hole blast holes. On the one hand, the vertically offset drilling chambers can meet the requirements of medium-deep hole construction and blast all the ore bodies in the stope. On the other hand, the construction method of the vertically offset drilling chambers and the sill drifting roadway can prevent miners from working under the exposed surface, reduce the mining risk, and improve the mining safety factor. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Shows a schematic diagram of the ore vein distribution in some embodiments;

[0022] Figure 2 Shows a schematic plan view of the ore block in some embodiments;

[0023] Figure 3 Shows Figure 2 The mining schematic diagram of the A-A stope;

[0024] Figure 4 Shows Figure 2 The schematic diagram of the completion of the mining of the A-A stope;

[0025] Figure 5 Shows Figure 2 The schematic diagram of the recovery of the second pillar in the A-A section;

[0026] Figure 6 Shows Figure 2Schematic diagram of stope filling in A-A section;

[0027] Figure 7 shows Figure 2 Schematic diagram of the recovery of the first intermediate pillar in A-A section;

[0028] Figure 8 shows Figure 3 Schematic diagram of B-B section;

[0029] Figure 9 shows Figure 3 Schematic diagram of C-C section.

[0030] Description of main component symbols:

[0031] 100 - ore vein; 110 - ore block; 111 - stope; 112 - muck pile; 113 - first intermediate pillar; 114 - second intermediate pillar; 115 - crown pillar; 120 - roof; 130 - floor; 200 - first raise; 300 - second raise; 310 - L-shaped drilling platform; 400 - undercut roadway; 500 - drilling chamber; 600 - filling retaining wall; 700 - pedestrian return airway; 800 - haulage roadway; 900 - ore drawing roadway; a - medium-deep hole blast hole; b - short hole. Detailed implementation manners

[0032] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0035] In this application, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0037] Embodiment 1

[0038] This embodiment is applicable to the mining of steeply inclined thin ore veins. The ore bodies of the steeply inclined thin ore veins referred to here are medium-thick to extremely thin ore bodies, the thickness of the ore body is less than 15m, and the dip angle of the ore body is greater than 50°.

[0039] Please refer to Figure 1 and Figure 2 , this embodiment provides a mining method for steeply inclined thin ore veins. The mining method for steeply inclined thin ore veins includes the following steps:

[0040] S100. Divide the ore vein 100 into multiple stages along the height direction of the ore vein 100. Set the first shafts 200 at intervals along the strike of the ore vein in each stage. The ore vein 100 between two adjacent first shafts 200 is divided into ore blocks 110. Add a second shaft 300 in the middle of the ore block 110. The second shaft 300 divides the ore block 110 into two stopes 111.

[0041] In this embodiment, the uppermost surface of the ore vein 100 is defined as the roof 120, and the lowermost surface is defined as the floor 130.

[0042] As described above, the stage height of each stage is between 30 - 90m, the distance between two adjacent first shafts 200 is 30 - 90m, and the cross-sectional diameters of the first shaft 200 and the second shaft 300 are greater than 1m. Such a mining structure can achieve efficient mining on the premise of ensuring safety.

[0043] This embodiment takes two stages as an example for illustration, and each stage includes three ore blocks 110.

[0044] Please refer to Figure 2 , Figure 3 and Figure 9 , and the following will take one ore block 110 for detailed description.

[0045] S200. Construct a plurality of ore-drawing roadways 900 at horizontal intervals along the ore-drawing roadway, and enter the level of the undercut roadway by climbing at the end of the ore-drawing roadway 900. Then, construct the undercut roadway 400 along the strike of the ore body, and connect the undercut roadway 400 with each first raise 200.

[0046] Since the muck pile 112 is funnel-shaped, this embodiment adopts a plurality of ore-drawing roadways 900, and each muck pile 112 formed after blasting can be evenly discharged through a corresponding ore-drawing roadway 900, gradually reducing the cross-sectional area of the muck pile 112. Compared with only setting one ore-drawing roadway 900, this embodiment improves the recovery rate of the muck pile 112.

[0047] The bottom of the second raise 300 is not connected to the undercut roadway 400, and an L-shaped drilling platform 310 is left at the bottom of the second raise 300 as the bottom drilling platform, which plays a role in supporting the roof 120.

[0048] The undercut roadway 400 serves as a compensation space and is used to provide a free surface for the blasting of the upper ore body. After the upper ore body is blasted, the ore falls downward to the undercut roadway 400 to form a muck pile 112. Due to the compensation of the undercut roadway 400, there is a certain distance between the upper part of the muck pile 112 and the ore body above it, which can be used for subsequent blasting.

[0049] In this embodiment, the height of the undercut roadway 400 is defined as h, and the height of the first blasting of the upper ore body is defined as H, and h≥0.5H, so as to ensure that there is a distance between the muck pile 112 and the ore body above it after the ore falls.

[0050] After each blasting, the muck pile 112 is evenly discharged at each position, so that the falling height of each position of the muck pile 112 remains basically the same, avoiding that the falling height of a certain position is too low to hinder the blasting of the ore body above it, or the falling height of a certain position is too high, and the distance between this position and the ore body above it is too large, resulting in danger.

[0051] S300. Construct a plurality of drilling chambers 500 at intervals along the extension direction of the first raise 200, and construct a plurality of drilling chambers 500 at intervals along the extension direction of the second raise 300. In the same stope 111, the drilling chambers 500 of the first raise 200 and the drilling chambers 500 of the second raise 300 are constructed staggeredly up and down.

[0052] In this embodiment, the rock drilling chambers 500 of the first shaft 200 and the rock drilling chambers 500 of the second shaft 300 are constructed with a vertical stagger in the height direction. The stagger height is the height of the rock drilling chamber 500. In this way, the construction coverage range of the long-hole blasting in the following text can be ensured to the greatest extent, and the explosion efficiency of the ore body can be improved.

[0053] The rock drilling chambers 500 in the second shaft 300 are constructed in two rows, and the two rows of rock drilling chambers 500 are symmetrically arranged along the extension direction of the second shaft 300. One row of rock drilling chambers 500 tunnels towards one of the first shafts 200, and the other row of rock drilling chambers 500 tunnels towards the other first shaft 200.

[0054] S400. After the miners enter the rock drilling chamber 500 from top to bottom, long-hole blast holes a are constructed in the ore body in the stope 111 through the rock drilling chamber 500, and the undercut roadway 400 is used as the blasting free face for blasting.

[0055] Since this embodiment has two stopes 111, the two stopes 111 can be constructed simultaneously without interference with each other, improving the mining speed.

[0056] After the construction of the long-hole blast holes a is completed, blasting is carried out successively from bottom to top. After each blasting, a muck pile 112 is formed, and ore is evenly drawn from each position of the muck pile 112. After the even ore drawing, a free face for the blasting of the upper long-hole blast holes a is left, and the space left is 1.2 - 1.8 times the volume of the ore blasted in a single blast.

[0057] In this embodiment, with the undercut roadway 400 as the free face and the miners standing in the vertically staggered rock drilling chambers 500 to construct the long-hole blast holes a, on the one hand, the vertically staggered rock drilling chambers 500 can meet the construction requirements of the long-hole blast holes a and blast all the ore bodies in the stope 111. On the other hand, the construction method of the vertically staggered rock drilling chambers 500 and the undercut roadway 400 can prevent the miners from working under the exposed surface, reducing the mining risk and improving the mining safety factor.

[0058] Please refer to Figure 3 and Figure 4 .

[0059] S500. After the ore drawing from the muck pile 112 is completed, a first pillar 113 is formed at the first shaft 200, and a second pillar 114 is formed at the second shaft 300.

[0060] At this time, the first pillar 113 and the second pillar 114 have a good supporting effect on the mined-out stope 111, preventing the stope 111 from collapsing and causing casualties to the miners.

[0061] Please refer to Figures 4 to 6 .

[0062] After first recovering the second intermediate pillar 114, construct a filling retaining wall 600 on the rock drilling platform and ore pass 900 of the first shaft 200, and fill the mined stope 111.

[0063] In this embodiment, it can be set that the bottom surface of the rock drilling chamber 500 is configured as a rock drilling platform, and miners can stand on the rock drilling platform and carry out blasthole construction.

[0064] After charging and blasting on the second intermediate pillar 114, recover it. Specifically, construct short holes b on the second intermediate pillar 114 for recovery. At this time, the first intermediate pillars 113 on both sides still play a good supporting role. The second intermediate pillar 114 is ore, and it has economic benefits after recovery. Such a mining method improves the ore recovery rate and reduces the dilution rate. After the second intermediate pillar 114 is recovered, promptly construct the filling retaining wall 600. Specifically, pour the filling retaining wall 600 on the rock drilling platform of the first shaft 200 and the ore pass 900. The retaining walls on both sides and the upper ore vein 100 and lower ore vein 100 together form a closed filling space, which is the above-mentioned stope 111. Filling into the stope 111 ensures the safety of the stope 111 and prevents the stope 111 from collapsing.

[0065] S700. After adjacent ore blocks 110 are mined, construct short holes b on the first intermediate pillar 113 close to the ore blocks 110 for blasting and recovery. After the first intermediate pillar 113 is recovered, construct a filling retaining wall at the bottom of the ore pass 900.

[0066] After the stope 111 is filled, the first intermediate pillar 113 on the left can be blasted and recovered, and the first intermediate pillar 113 on the right is used as a support for the next stage and can also be blasted and recovered when the mining of the next stage is completed. In this way, the ore in the ore vein 100 can be efficiently recovered, improving the mining rate.

[0067] For the above, construct short holes b on the first intermediate pillar 113 and the second intermediate pillar 114. Taking the first intermediate pillar 113 as an example, short holes b can be constructed downward from the upper surface of the first intermediate pillar 113, or short holes b can be constructed upward from the lower surface of the adjacent first intermediate pillar 113. Similarly, the construction method of the short holes b of the second intermediate pillar 114 is the same as that of the first intermediate pillar 113 and will not be elaborated here.

[0068] After the short holes b of the first intermediate pillar 113 and the second intermediate pillar 114 are constructed, conduct centralized blasting on all the short holes b. Personnel do not need to enter the stope 111, improving the blasting safety and protecting personal safety.

[0069] Please refer to Figure 6 and Figure 7, after the first stull 113 is recovered by blasting, the void formed at this position is backfilled. In the case of mining and backfilling simultaneously, the mining safety factor is improved, the risk of collapse of the ore vein 100 is reduced, which is beneficial to the continuous mining operation in the later stage.

[0070] Please refer to Figure 1 and Figure 3 , based on the above, this embodiment also provides a mining structure for steeply inclined thin ore veins. The mining structure for steeply inclined thin ore veins includes: ore vein 100, first raise 200, second raise 300, ore-drawing roadway 900 and undercut roadway 400. The first raises 200 are arranged at intervals along the strike of the ore vein 100. The area between two adjacent first raises 200 is divided into ore blocks 110. The second raise 300 is arranged in the middle of the ore block 110 and divides the ore block 110 into two stopes 111. Multiple drilling chambers 500 are respectively arranged in the first raise 200 and the second raise 300. In the same stope 111, the drilling chambers 500 in the first raise 200 and the drilling chambers 500 in the second raise 300 are arranged staggeredly up and down. The ore-drawing roadway 900 is arranged at the ore-drawing roadway level. The undercut roadway 400 is connected to the first raise 200 and the ore-drawing roadway 900.

[0071] Long-distance horizontal medium-deep blast holes a are used to achieve centralized blasting for ore caving. Miners do not need to enter the stope 111, which greatly improves the production capacity on the premise of ensuring safety and reduces the mining production cost.

[0072] Embodiment Two

[0073] Based on Embodiment One, this embodiment makes improvements, and the improvements are in the following two aspects.

[0074] First aspect, please refer to Figure 3 and Figure 8 , at the top of each stage outside the vein, a pedestrian return airway 700 and a pedestrian return airway connecting lane are constructed along the strike of the ore vein 100. The pedestrian return airway 700 is connected to the first raise 200 and the second raise 300 through the pedestrian return airway connecting lane, realizing the functions of ventilation and pedestrian passage, and improving the safety of mining operations.

[0075] Second aspect, please refer to Figure 3 and Figure 9 , at the bottom of each stage outside the vein, a transportation roadway 800 is constructed along the strike of the ore vein 100. The transportation roadway 800 is constructed until it is connected to the ore-drawing roadway 900. This embodiment uses the ore-drawing roadway 900 and the transportation roadway 800 to realize ore transfer, saving labor.

[0076] In this embodiment, the number of ore-drawing roadways 900 is multiple. The multiple ore-drawing roadways 900 are arranged at intervals, and each ore-drawing roadway 900 is arranged at an obtuse angle with the haulage level 800, which is convenient for transportation equipment such as load-haul-dumpers to turn during transportation. Compared with a right-angle turn, an obtuse-angle turn is more suitable for large transportation equipment, reducing the turning radius and improving transportation efficiency.

[0077] To achieve uniform ore drawing from the muck pile 112, it should be ensured as much as possible that the ore-drawing amount of each ore-drawing roadway 900 is basically the same, and the total ore-drawing amount of all ore-drawing roadways 900 is the ore amount of a single blasting, that is, after each blasting, all the ore is drawn out, and then the next charging and blasting are carried out.

[0078] In some embodiments, a crown pillar 115 is provided at the top of the ore body to isolate the influence generated by the stoping of the upper-stage ore body.

[0079] In the actual mining process, the straight-line distance between the pedestrian return airway 700 and the ore body is 20 - 200 m, and the straight-line distance between the haulage level 800 and the ore body is 20 - 200 m. To ensure the walking and turning requirements of the load-haul-dumper, the roadway dimensions of the ore-drawing roadway 900 and the haulage level 800 are 2 - 6 m wide and 2 - 6 m high. To facilitate pedestrian access and material transportation, the dimensions of the pedestrian return airway and the pedestrian return crossheading are 2 - 6 m wide and 2 - 6 m high.

[0080] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A mining method for steeply inclined thin ore veins, characterized in that: The ore vein is divided into multiple stages along the height direction of the ore vein. In each stage, first shafts are arranged at intervals along the strike of the ore vein. The ore vein between two adjacent first shafts is divided into ore blocks, and second shafts are added in the middle of the ore blocks. The second shafts divide the ore blocks into two stopes; A plurality of ore-drawing roadways are constructed horizontally at intervals along the ore-drawing roadway, and the end of the ore-drawing roadway climbs to enter the level of the undercut roadway, then the undercut roadway is constructed along the strike of the ore body, and the undercut roadway is connected to each of the first shafts; A plurality of drilling chambers are constructed at intervals along the extension direction of the first shaft, and a plurality of drilling chambers are constructed at intervals along the extension direction of the second shaft. The drilling chambers in the second shaft are constructed in two rows, and the two rows of drilling chambers are symmetrically arranged along the extension direction of the second shaft. One row of drilling chambers tunnels towards one of the first shafts, and the other row of drilling chambers tunnels towards the other first shaft. In the same stope, the drilling chambers of the first shaft and the drilling chambers of the second shaft are staggered in the height direction, and the staggering height is the height of the drilling chamber; After the mining personnel enter the drilling chamber from top to bottom, horizontal medium-deep hole blast holes are constructed in the ore body in the stope through the drilling chamber. After the construction of the horizontal medium-deep hole blast holes is completed, the undercut roadway is used as the blasting free face and blasting is carried out successively from bottom to top.

2. The steeply inclined thin ore vein mining method according to claim 1, characterized in that, A pedestrian return airway and a pedestrian return airway connecting roadway are constructed along the strike of the ore vein at the top of each stage outside the vein, and the pedestrian return airway is connected to the first shaft and the second shaft through the pedestrian return airway connecting roadway.

3. The steeply inclined thin ore vein mining method according to claim 2, characterized in that, A transportation roadway is constructed along the strike of the ore vein at the bottom of each stage outside the vein, and the transportation roadway is constructed to be connected to the ore-drawing roadway.

4. The steeply inclined thin ore vein mining method according to any one of claims 1 to 3, characterized in that, The drilling chambers in the second shaft are constructed in two rows, and the two rows of drilling chambers are symmetrically arranged along the extension direction of the second shaft. One row of drilling chambers tunnels towards one of the first shafts, and the other row of drilling chambers tunnels towards the other first shaft.

5. The steeply inclined thin ore vein mining method according to any one of claims 1 to 3, characterized in that After the construction of the medium-deep hole blast holes is completed, blasting is carried out successively from bottom to top.

6. The steeply inclined thin ore vein mining method according to claim 5, characterized in that, After each blasting, a muck pile is formed, and the ore is evenly drawn from each position of the muck pile. After the even ore drawing, a free face for the blasting of the upper medium-deep hole blast holes is left, and the space left is 1.2 - 1.8 times the volume of the ore blasted in a single blast.

7. The steeply inclined thin ore vein mining method according to claim 6, characterized in that, It also includes: After the ore drawing from the muck pile is completed, a first intermediate pillar is formed at the first shaft, and a second intermediate pillar is formed at the second shaft.

8. The steeply inclined thin ore vein mining method according to claim 7, characterized in that, After the second intermediate pillar is recovered first, a filling retaining wall is constructed on the drilling platform of the first shaft and the ore-drawing roadway to fill the mined stope.

9. The steeply inclined thin ore vein mining method according to claim 8, characterized in that, After adjacent ore blocks are mined, shallow holes are drilled in the first intermediate pillar between the ore blocks for blasting and recovery, and after the first intermediate pillar is recovered, a filling retaining wall is constructed at the bottom of the ore-drawing roadway.

10. A mining structure for steeply inclined thin ore veins, characterized in that, Based on the steeply inclined thin ore vein mining method described in any one of claims 1 to 9, the steeply inclined thin ore vein mining structure includes: an ore vein, a first shaft, a second shaft, an ore-drawing roadway, and a sill drift. The first shafts are arranged at intervals along the strike of the ore vein, and the area between two adjacent first shafts is divided into ore blocks. The second shaft is arranged in the middle of the ore block and divides the ore block into two stopes. A plurality of drilling chambers are respectively arranged in the first shaft and the second shaft. In the same stope, the drilling chambers in the first shaft and the drilling chambers in the second shaft are arranged vertically offset from each other, and the offset height is the height of the drilling chamber. The two rows of drilling chambers in the second shaft are symmetrically arranged along the extension direction of the second shaft. The ore-drawing roadway is arranged at the ore-drawing roadway level, and the sill drift is connected to the first shaft and the ore-drawing roadway.

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