High-efficiency mining method for complex steeply inclined and extremely thin ore body

Abstract

The present application relates to a kind of complex steeply dipping extremely thin ore body efficient mining method, comprising the following steps: S1, according to the vein engineering disclosed vein condition division mining block;S2, in the vein roadway of mining block corresponding section along vein construction ore drawing structure, and according to the design requirement in the two sides of mining block construction order road raise and interval column;S3, in the process of construction order road raise, according to the actual exposure situation of vein adjustment order road raise construction position;S4, according to the position of re-exposed vein adjustment order road raise construction position, continue to the direction of upper section along vein construction order road raise in the position of re-exposed vein;S5, after completing order road raise construction, construction draw-off space in stope bottom, and using shallow hole layer-by-layer blasting method to carry out layer-by-layer mining to ore room;S6, after ore room mining, according to the condition of goaf construction filling well, and through filling well to the goaf filling management.The present application realizes the accurate, efficient mining of ore body resources under the condition of complex vein.

Description

Technical Field

[0001] This invention belongs to the field of mining technology, and in particular relates to an efficient mining method for complex, steeply inclined, and extremely thin ore bodies. Background Technology

[0002] With the increasing demand for mineral resource development, the importance of rare strategic metal resources such as wolframite and gold is rising. Some of these strategic metal mineral resources are found in steeply dipping, extremely thin deposits. These deposits are typically vein-like, characterized by thin ore bodies, large dip angles, and complex occurrence conditions, making them difficult to mine. Currently, traditional mining methods such as shallow-hole casting and backfilling are commonly used for mining steeply dipping, extremely thin ore bodies. In actual mining operations, these ore bodies are often accompanied by complex geological phenomena such as developed fault joints and fissures, vein pinch-outs, and branching, requiring appropriate mining designs based on the ore body's occurrence conditions.

[0003] However, existing methods for mining steeply dipping, extremely thin ore bodies often fail to adapt to changes in the actual vein strike when faced with significant variations in vein morphology. These methods typically operate within a pre-designed stope area. For example, during mining, vein pinch-outs, shortened vein strike lengths, or vein displacement due to fault movement can occur. Continuing to mine according to the original design can lead to a large amount of waste rock being mixed into the ore within the stope area. This not only increases ore dilution and reduces resource recovery efficiency but also increases the pressure on underground hoisting, transportation, and subsequent beneficiation, while simultaneously increasing production costs related to blasting, ore extraction, and transportation. Furthermore, the increased ineffective excavation area within the stope also increases the exposed area of ​​surrounding rock, raising the risk of ground pressure manifestation and compromising the safety of underground workers. Therefore, further research is needed on how to accurately track the vein, reduce waste rock extraction, and improve resource recovery efficiency during the mining of steeply dipping, extremely thin ore bodies under complex geological conditions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for efficient mining of complex, steeply inclined, and extremely thin ore bodies. By dynamically adjusting the construction position of the access shaft according to the actual exposure of the ore vein, and utilizing the inter-pillar connecting tunnel to extend and track the ore vein while shortening the length of the ore block, precise and efficient mining of ore resources under complex ore vein conditions can be achieved.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A method for efficient mining of complex, steeply dipping, extremely thin ore bodies includes the following steps: S1, divide the mining blocks according to the ore vein conditions revealed by the vein engineering, and determine the mining length, intermediate height, reserved roof thickness and mining width of the mining blocks; S2, construct the ore discharge structure in the middle section of the vein roadway corresponding to the mining block, and construct the roadway lift and inter-pillar on both sides of the mining block according to the design requirements; S3, During the construction of the aforementioned access shaft, the construction position of the access shaft is adjusted according to the actual exposure of the ore vein; when it is found that the ore vein pinches out at the position of the pillar, or when it is found that the ore vein is shifted due to fault displacement and the direction of the shift can be determined, it is determined that continuing to construct the access shaft according to the original design position is not conducive to the recovery of ore resources; at the position of the pillar where the above situation occurs, the connecting road is extended along the strike direction of the ore body inside the stope through the pillar connecting road until a ore vein with mining value is exposed again; S4. Adjust the construction position of the access shaft according to the newly exposed ore vein location. Continue to construct the access shaft towards the upper middle section at the newly exposed ore vein location, and connect the access shaft with the upper middle section roadway to adjust the mining range of the stope and shorten the length of the mining block. S5. After completing the construction of the access shaft, a bottom space is constructed at the bottom of the stope, and the stope is mined layer by layer using shallow hole layered blasting. First, a blasting free face is formed in the middle of the stope, and then blasting is carried out towards both ends of the stope until the stope is mined. S6. After the mining of the stope is completed, a backfilling well is constructed according to the condition of the goaf, and the goaf is backfilled and treated through the backfilling well.

[0006] Preferably, in step S1, the mining length of the mining block is 50-70m, the mid-section height is 40-60m, the reserved roof thickness is 3-5m, and the mining width is adjusted according to the width of the vein.

[0007] Preferably, in step S1, a bottom pillar is set according to the ore block structure parameters. The bottom pillar is set at the bottom of the stope to support the stope structure.

[0008] Preferably, in step S2, the ore discharge structure includes a funnel opening and a funnel neck communicating with the funnel opening, and a plurality of funnel openings are arranged at intervals along the extension direction of the middle section vein roadway.

[0009] Preferably, in step S3, if the ore vein is not exposed after the extension of the connecting road through the inter-pillar connecting road, a probe is constructed on the inner wall of the stope in conjunction with the mine geological data to determine the location of the ore vein, and the construction position of the access shaft is adjusted according to the determined ore vein location.

[0010] Preferably, in step S3, when a vein pinch-out or vein shift occurs on one side of the mining block, the construction position of the guide shaft on the corresponding side is adjusted; when a vein pinch-out or vein shift occurs on both sides of the mining block, the construction positions of the guide shafts on both sides are adjusted respectively to shorten the length of the mining block.

[0011] Preferably, in step S3, the extension length of the inter-pillar connecting channel is adjusted according to the vein pinch-out location or vein offset location until a vein that meets the mining requirements is re-exposed.

[0012] Preferably, in steps S3 and S4, when vein pinch-out or vein displacement occurs multiple times during the construction of the access shaft, the construction position of the access shaft is adjusted multiple times according to the actual vein direction, so that the adjusted stope forms a stepped stope internal structure.

[0013] Preferably, in step S4, after the construction of the access shaft is completed, a bottom space is constructed from the bottom of the mining area. The bottom space has a height of 2m and a width of 1.5m.

[0014] Preferably, in step S5, the shallow-hole layered blasting is carried out using a quincunx pattern of holes, and the layered mining steps are repeated until the mining of the stope is completed.

[0015] Compared with the prior art, the advantages of the present invention are as follows: This invention provides a highly efficient mining method for complex, steeply dipping, extremely thin ore bodies. Addressing the challenges of complex vein morphology changes, vein pinch-outs, vein displacement due to fault movement, and variations in vein strike length during mining, this method dynamically adjusts the mining plan based on the actual vein exposure during the preparatory phase. When it becomes difficult to accurately track the vein at the original design location, an extended connecting project is used to re-expose a vein with mining value. The subsequent preparatory phase layout is adjusted based on the re-exposed vein location, thereby altering the stope mining area and shortening the length of the mined block. This makes the mining process more adaptable to complex vein occurrence conditions. Compared to traditional methods that mine within a fixed stope area, this invention allows for timely adjustment of the stope boundary based on actual vein changes, avoiding large-scale waste rock mining caused by shortened vein strike length or vein displacement, reducing ore dilution due to waste rock mixing with the original ore, and improving mineral resource recovery efficiency. At the same time, by reducing the amount of ineffective mining work, the production costs of blasting, leveling, ore extraction, transportation and hoisting, as well as subsequent ore beneficiation can be reduced, thereby improving the overall economic benefits of the mine. Attached Figure Description

[0016] Figure 1 This is a flowchart of the efficient mining method for complex, steeply inclined, and extremely thin ore bodies according to the present invention. Figure 2This is a schematic diagram of standard mining operations. Figure 3 This is a schematic diagram of the mining site in an embodiment of the present invention; Figure 4 This is a supplementary schematic diagram of the mining site in an embodiment of the present invention.

[0017] Attached diagram labels: 1-Inter-pillar connecting roadway; 2-Mid-section along-vein roadway; 3-Mined ore pile; 4-Function hole neck; 5-Bottom pillar; 6-Function hole opening; 7-Straight-way lift; 8-Through-vein roadway; 9-Upper mid-section roadway; 10-Stop; 11-Filling shaft. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the present invention.

[0019] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0020] like Figure 1-4 As shown in the figure, this embodiment discloses a method for efficient mining of complex, steeply dipping, extremely thin ore bodies, including the following steps: S1 involves dividing the ore body into mining blocks based on the vein conditions revealed by the vein-side engineering, and determining the mining length, intermediate height, reserved roof thickness, and mining width of each mining block. The vein-side engineering is used to expose the ore body along its strike direction. By analyzing the exposed vein occurrence, mining blocks suitable for subsequent mining operations are divided. This allows for stope design based on the actual vein distribution, avoiding the use of fixed stope layouts that could lead to a large number of ineffective mining areas during subsequent mining.

[0021] S2, construct the ore-discharging structure within the intermediate-section vein roadway 2 corresponding to the mining block, and construct the access shafts 7 and interstitial supports on both sides of the mining block according to design requirements. The intermediate-section vein roadway 2 is arranged along the vein strike direction, serving as the basic passage for ore transportation and preparatory work. The ore-discharging structure is used to centrally discharge ore generated during subsequent mining. The access shafts 7 are located on both sides of the mining block, providing access for personnel and ventilation within the stope, and serving as an important construction path for revealing vein changes and determining the adjustment position of preparatory work during construction. Interstitial supports are located between adjacent stope areas to maintain the stability of the stope structure. In this embodiment, the intermediate-section vein roadway 2 and the through-vein roadway 8 cooperate to form a preparatory roadway system. The through-vein roadway 8 connects preparatory works in different directions, providing auxiliary passages for personnel access, equipment transportation, and stope construction.

[0022] S3, during the construction of the access shaft 7, the construction position of access shaft 7 is adjusted according to the actual exposure of the ore vein. When a pinch-out phenomenon is found at the pillar location, or when the ore vein is found to have shifted due to fault displacement and the direction of the shift can be determined, it is determined that continuing to construct access shaft 7 according to the original design position is not conducive to ore resource recovery. At the pillar location where the above situation occurs, the connecting road 1 is constructed along the strike direction of the ore body inside the stope until a ore vein with mining value is exposed again. Among them, ore vein pinch-out refers to the situation where the ore vein gradually narrows along the extension direction until it can no longer form an effective mining area. When the above situation occurs, if construction continues according to the original design stope range, a large amount of surrounding rock or waste rock will enter the mining range. Therefore, by extending the connecting road 1 into the stope, the actual position of the ore vein is re-tracked, so that the subsequent mining preparation project can better fit the actual occurrence state of the ore vein. This method avoids the ineffective project caused by continuing to excavate access shaft 7 after it deviates from the ore vein due to the fixed stope boundary.

[0023] S4. Adjust the construction position of the access shaft 7 according to the newly exposed vein location. Continue constructing the access shaft 7 towards the upper middle section at the newly exposed vein location, and connect the access shaft 7 with the upper middle section roadway 9 to adjust the mining range of the stope 10 and shorten the length of the mining block. The upper middle section roadway 9 is located above the mining block and is used to connect with the adjusted access shaft 7, forming a complete vertical passage. By redetermining the position of the access shaft 7, the boundary of the stope 10 can be adjusted according to the actual exposed vein location, thereby reducing the mining of non-mineralized areas within the original design block area.

[0024] S5, after completing the construction of the access shaft 7, constructs a bottom-extraction space at the bottom of the stope and uses shallow-hole layered blasting to mine the stope 10 layer by layer. First, a blasting free face is formed in the middle of the stope, then blasting proceeds towards both ends of the stope until the stope 10 is mined out. The bottom-extraction space provides initial working space for subsequent layered blasting. The shallow-hole layered blasting method achieves ore body mining by advancing layer by layer. The ore pile 3 formed by the blasting is temporarily stored inside the stope and gradually used for ore extraction as the mining process progresses.

[0025] S6. After the mining of stope 10 is completed, a backfilling well 11 is constructed according to the condition of the goaf, and the goaf is backfilled and treated through the backfilling well 11. The backfilling well 11 is used to establish a connection channel between the goaf and the backfilling system. After the mining of stope 10 is completed and the goaf is formed, the goaf is backfilled through the backfilling well 11 to achieve subsequent goaf treatment.

[0026] Further, in step S1, the mining length of the ore block is 50-70m, the mid-section height is 40-60m, the reserved roof thickness is 3-5m, and the mining width is adjusted according to the vein width. These parameters are set based on the occurrence characteristics of steeply dipping, extremely thin ore bodies and actual mining requirements. Specifically, the ore block length limits the mining range of a single stope, the mid-section height meets the needs of personnel construction, ventilation, and preparatory engineering layout, the reserved roof thickness maintains the stability of the surrounding rock at the top of the stope, and the mining width is adjusted according to the actual width of the vein to adapt to changes in vein thickness and improve the ore body resource recovery effect. Furthermore, a bottom pillar 5 is set according to the ore block structure parameters. The bottom pillar 5 is located at the bottom of the stope 10 to support the stope structure. Located below the stope 10, the bottom pillar 5 forms a support structure by reserving a portion of the ore body. During the mining of the stope 10, it can support the bottom structure of the stope, improve the overall stability of the stope, and provide basic conditions for the subsequent safe mining of the stope 10.

[0027] Further, in step S2, the ore discharge structure includes a funnel opening 6 and a funnel neck 4 connected to the funnel opening 6. Multiple funnel openings 6 are arranged at intervals along the extension direction of the intermediate vein roadway 2. The ore discharge structure is used to transport the ore produced during the mining process of the stope 10 to the intermediate vein roadway 2, and forms an ore transfer channel through the funnel opening 6 and the funnel neck 4. The funnel opening 6 serves as the inlet for the ore to enter the ore discharge structure, and the funnel neck 4 is used to connect the funnel opening 6 with the lower transport space, so that the mined ore can be output in a concentrated manner, thereby improving the ore transport efficiency.

[0028] In step S3 of this embodiment, if the ore vein is not revealed after extending the connecting tunnel 1, exploratory boreholes are constructed on the inner wall of the stope, based on the mine's geological data, to determine the location of the ore vein. The construction position of the follow-through riser 7 is then adjusted according to the determined ore vein location. Specifically, if the ore vein is still not directly revealed after extending the connecting tunnel, existing geological exploration data can be used to analyze and determine the possible ore vein occurrence areas. Exploratory boreholes are then constructed at corresponding locations on the inner wall of the stope. The detection results further determine the actual location of the ore vein, thus providing a basis for adjusting the subsequent construction position of the follow-through riser 7 and improving the accuracy of ore vein tracking.

[0029] In step S3, when a vein pinch-out or vein shift occurs on one side of the mining block, the construction position of the corresponding access shaft 7 is adjusted. When vein pinch-out or vein shift occurs on both sides of the mining block, the construction positions of the access shafts 7 on both sides are adjusted respectively to shorten the length of the mining block. Specifically, when a vein pinch-out or vein shift occurs on only one side of the mining block, only the access shaft 7 on the corresponding side is adjusted so that the access shaft 7 can move closer to the vein position again. When the above situation occurs on both sides of the mining block, the access shafts 7 on both sides are adjusted respectively. By shortening the length of the mining block from both sides, the adjusted mining range is made more consistent with the actual distribution of the vein, reducing the mining of non-mineralized areas.

[0030] In step S3, the extension length of the inter-pillar connecting tunnel 1 is adjusted according to the vein pinch-out location or vein offset location until a vein meeting the mining requirements is re-exposed. The inter-pillar connecting tunnel 1 is not constructed with a fixed length, but is flexibly adjusted according to the actual changes in the vein. When the vein pinch-out range is large or the vein offset distance is far, the extension length of the inter-pillar connecting tunnel 1 can be appropriately increased until a mineable vein is re-exposed, thereby improving the vein tracking effect.

[0031] Furthermore, in steps S3 and S4, when vein pinch-out or vein displacement occurs multiple times during the construction of the access shaft 7, the construction position of the access shaft 7 is adjusted multiple times according to the actual strike of the vein, so that the adjusted stope forms a stepped stope internal structure. Specifically, when the vein pinches out or shifts multiple times along the strike direction, the method of extending the inter-pillar connecting roadway 1, re-exposing the vein, and adjusting the position of the access shaft 7 can be repeatedly used, so that the access shaft 7 is gradually adjusted with the vein changes, thereby forming a stepped stope internal structure adapted to the actual strike of the vein, improving the adaptability of mining under complex vein conditions. In step S4, after the construction of the access shaft 7 is completed, a bottom-pull space is constructed from the bottom of the stope, with a height of 2m and a width of 1.5m. This bottom-pull space is located at the bottom of the stope 10 and is used to provide initial blasting space and working space for subsequent layered mining of the stope 10. Forming a bottom-pull space of reasonable size facilitates the subsequent shallow-hole layered blasting work.

[0032] In step S5 of this embodiment, shallow-hole layered blasting is carried out using a quincunx pattern of holes, and the layered mining steps are repeated until the mining of stope 10 is completed. Specifically, during the mining of stope 10, the blasting holes are arranged in a quincunx pattern according to the ore body occurrence, making the blasting effect more uniform. After each layer of ore body is mined, the next layer of blasting and mining continues until the entire mining operation of stope 10 is completed. The ore heap 3 formed during the mining process is processed for ore extraction according to the actual construction situation.

[0033] The following explanation will be based on specific mine conditions. Figure 3 Taking the shown mining area as an example, and Figure 2 Compared with the standard stope shown, this technology addresses situations such as vein pinch-out during the mining of steeply inclined, extremely thin ore bodies using the shallow-hole ore-keeping method. By shortening the length of the entire stope block, it reduces the amount of work required to mine the ore block according to the original design and reduces the mining of waste rock.

[0034] in, Figure 3 The shown stope has a vein dip angle of approximately 76°, runs roughly east-west, and has a width of about 22 cm. It gradually narrows and tapers from east to west, with an average bulk density of 2.7 g / cm³. 3 The rock stability coefficient is 10-12, the stope length is designed to be 74m, a total of 13 ore discharge funnels are set, the middle section height is 50m, the bottom pillar 5 has a specification of 3.5m×3.5m, and the stope width is controlled at about 1.2m.

[0035] During the specific construction process, after dividing the ore into blocks along the vein, a construction technical plan was formulated, the ore discharge hopper was cut and constructed, and concrete was poured to form a standard ore discharge structure. The ore discharge hopper is used for the concentrated discharge of subsequent ore to meet the ore transportation needs during the mining process.

[0036] According to the design, the access shaft 7 and the pillar were constructed from both sides of the ore block. During the construction of the access shaft 7 on the east side, the ore vein did not change significantly, and the access shaft 7 was formed normally and connected to the upper middle section roadway 9. When the access shaft 7 on the west side was constructed to a height of 24m, it was found that the ore vein width decreased sharply and pinched out. Therefore, the connecting roadway 1 was constructed along the vein strike inside the stope to shorten the upper length of the stope until the ore vein was re-tracked. Then, the access shaft 7 was constructed upwards and connected to the upper middle section roadway 9.

[0037] Furthermore, the intermediate pillar connecting road 1 in the diagram extends to a length of 10m, with a remaining mineable height of 18.4m. The length of the intermediate pillar connecting road 1 can be flexibly adjusted according to the pinch-out of the vein until the vein is re-tracked.

[0038] When pinch-out occurs on both the east and west sides of the ore vein, such as Figure 4 As shown, the feed wells 7 at both ends of the stope can be extended into the stope to reduce the amount of waste rock mined by shortening the length of the ore block. When the veins on one or both sides of the feed well 7 continuously pinch out into the ore block, the above adjustment method can be used multiple times to form a stepped internal structure of the stope, thereby more accurately tracking the ore veins and reducing the ore dilution rate.

[0039] After the completion of the 7-way well and the conditions that meet the needs of personnel passage and ventilation, the bottom space will be constructed from the bottom of the mining area to provide a foundation for the subsequent mining operations of the 10-stope. The height of the bottom space will be controlled at 2m and the width at 1.5m.

[0040] After the bottom leveling is completed, the ore blocks are mined in layers. First, a blasting free face is formed in the middle of the stope. Blasting is carried out on both sides using a quincunx pattern to complete one layer of mining operation. The above steps are repeated until the mining of stope 10 is completed.

[0041] After the mining of stope 10 is completed, a backfilling well 11 will be constructed in the mining area according to the actual situation, and the goaf will be backfilled and treated through the backfilling well 11.

[0042] Taking the illustrated stope as an example, the method of this invention for mining blocks can reduce the amount of waste rock recovered by approximately 596 tons compared to traditional mining methods, based on an explosive consumption of 0.8 kg / m³. 3 Calculations show that this can reduce the consumption of explosives by 176.6 kg, thereby reducing production costs.

[0043] As can be seen from the above embodiments, unlike the traditional method of constructing the access shaft 7 along the fixed stope boundary and then mining, this embodiment dynamically adjusts the construction position of the access shaft 7 during the construction process according to the actual exposure of the ore vein. It extends into the stope through the inter-pillar connecting roadway 1 and re-tracks the ore vein, so that the preparatory work always matches the actual occurrence position of the ore vein. This enables flexible adjustment of the mining range, reduces ineffective mining areas caused by factors such as ore vein pinch-out and displacement, and improves the ore resource recovery efficiency under complex, steeply inclined, and extremely thin ore body conditions.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for efficient mining of complex, steeply dipping, extremely thin ore bodies, characterized in that, Includes the following steps: S1, divide the mining blocks according to the ore vein conditions revealed by the vein engineering, and determine the mining length, intermediate height, reserved roof thickness and mining width of the mining blocks; S2, construct the ore discharge structure in the middle section of the vein roadway (2) corresponding to the mining block, and construct the roadway lift (7) and inter-pillars on both sides of the mining block according to the design requirements; S3, during the construction of the above-mentioned access shaft (7), the construction position of the access shaft (7) is adjusted according to the actual exposure of the ore vein; when it is found that the ore vein pinches out at the position of the inter-pillar, or when it is found that the ore vein is shifted due to fault displacement and the direction of the ore vein shift can be determined, it is judged that continuing to construct the access shaft (7) according to the original design position is not conducive to the recovery of ore resources; at the position of the inter-pillar where the above situation occurs, the connecting road (1) is constructed along the direction of the ore body inside the mining area to continue to extend the connecting road until a ore vein with mining value is exposed again; S4, adjust the construction position of the access shaft (7) according to the newly exposed ore vein location, continue to construct the access shaft (7) in the direction of the upper middle section at the newly exposed ore vein location, and make the access shaft (7) connected with the upper middle section roadway (9) to adjust the mining range of the stope (10) and shorten the length of the mining block; S5. After the construction of the above-ground shaft (7) is completed, the bottom space is constructed at the bottom of the mining area, and the mineral house (10) is mined layer by layer by shallow hole layered blasting method. First, a blasting free face is formed in the middle of the mining area, and then blasting is carried out towards both ends of the mining area until the mining of the mineral house (10) is completed. S6, after the mining stope (10) is completed, a filling well (11) is constructed according to the condition of the goaf, and the goaf is filled and treated through the filling well (11).

2. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S1, the mining length of the mining block is 50-70m, the mid-section height is 40-60m, the reserved roof thickness is 3-5m, and the mining width is adjusted according to the width of the vein.

3. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 2, characterized in that, In step S1, a bottom column (5) is set according to the ore block structure parameters. The bottom column (5) is set at the bottom of the ore house (10) to support the mining structure.

4. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S2, the ore discharge structure includes a funnel opening (6) and a funnel neck (4) connected to the funnel opening (6), and multiple funnel openings (6) are arranged at intervals along the extension direction of the middle section vein roadway (2).

5. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S3, if the vein is not exposed after the extension of the connecting road through the inter-column connecting road (1), the ore vein is located by constructing a probe on the inner wall of the mining area in conjunction with the mine geological data, and the construction position of the connecting shaft (7) is adjusted according to the determined ore vein location.

6. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S3, when a vein pinch-out or vein shift occurs on one side of the mining block, the construction position of the corresponding side access shaft (7) is adjusted; when a vein pinch-out or vein shift occurs on both sides of the mining block, the construction position of the side access shaft (7) on both sides is adjusted respectively to shorten the length of the mining block.

7. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S3, the extension length of the inter-pillar connecting channel (1) is adjusted according to the vein pinch-out location or vein offset location until a vein that meets the mining requirements is re-exposed.

8. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In steps S3 and S4, when the vein pinches out or shifts multiple times during the construction of the access shaft (7), the construction position of the access shaft (7) is adjusted multiple times according to the actual direction of the vein, so that the adjusted mining area forms a stepped mining area internal structure.

9. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S4, after the construction of the access shaft (7) is completed, a bottom space is constructed from the bottom of the mining area. The bottom space has a height of 2m and a width of 1.5m.

10. The efficient mining method for complex, steeply dipping, extremely thin ore bodies according to claim 1, characterized in that, In step S5, the shallow hole layered blasting is carried out using a quincunx pattern of holes, and the layered mining steps are repeated until the mining of the stope (10) is completed.

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