A method for mining slightly inclined, extremely thin precious ore bodies

Abstract

This application provides a method for mining extremely thin, slightly inclined precious ore bodies, belonging to the field of mining engineering technology. The method includes: excavating a haulage roadway along the strike of the ore body, and intermittently using a direct mining roadway with excavating machinery; drilling along the inclined direction of the ore body using an inner tube assembly drill bit, the inner tube assembly drill bit comprising an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion; stopping drilling when the inner tube portion is fully loaded, separating the drilling rig portion and detaching the inner tube portion from the mined ore body using a traction system; and using ore transport vehicles to remove the ore. By optimizing the roadway layout to ensure stope structural stability, reducing residual ore fragments through in-situ collection of the inner tube, and reducing auxiliary operation time through simultaneous drilling and mining, the method comprehensively solves the problems of recovery rate, safety, and work efficiency in mining extremely thin ore bodies.

Description

Technical Field

[0001] This invention belongs to the field of mining engineering technology, and in particular relates to a method for mining a slightly inclined, extremely thin precious ore body. Background Technology

[0002] Mining gently dipping, extremely thin ore bodies is a common challenge in the mining industry both domestically and internationally. Due to the thinness and gentle dip of the ore body, the limited working space, the inability of the ore to flow naturally, and the impracticality of large-scale mechanized equipment, traditional mining methods suffer from low production efficiency, significant mining losses and dilution, high labor intensity for workers, and poor safety. In particular, mining methods for horizontally slightly dipping, extremely thin ore bodies require balancing ore dilution control, mining efficiency, and safety, making the process even more difficult. Summary of the Invention

[0003] In view of the technical problems existing in the background art, this application provides a method for mining a slightly inclined, extremely thin precious ore body, comprising:

[0004] The ore body is excavated along the vein transport roadway, and the excavation machinery is used to directly mine the roadway at intervals;

[0005] The drill bit is used to drill along the inclined direction of the ore body. The drill bit includes an inner tube part and a drilling rig part. The inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part.

[0006] Drilling stops once the inner tube section is fully loaded. The drilling rig is then separated from the mining body via the traction system, and the inner tube section is detached from the mined ore body.

[0007] Minerals are transported out using ore trucks.

[0008] In some embodiments, before drilling along the dip direction of the ore body using an inner tube assembly drill bit, the inner tube assembly drill bit comprising an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion, the method for mining the slightly inclined, extremely thin, precious ore body further includes:

[0009] Select the drill bit and drill rod combination according to the thickness of the ore body. When the thickness of the ore body is less than the diameter of the drill bit, select the smallest applicable drill bit that is larger than the thickness of the ore body.

[0010] In some embodiments, after selecting the combination of drill bit and drill rod according to the ore body thickness, the method for mining a slightly inclined, extremely thin, valuable ore body further includes:

[0011] The choice between single-pass drilling or layered drilling is made based on the relationship between the drill bit diameter and the thickness of the ore body.

[0012] In some embodiments, the drilling using the inner tube assembly drill bit along the inclined direction of the ore body, the inner tube assembly drill bit including an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion, includes:

[0013] Layered drilling is carried out, with the upper surface of the drill bit contacting the upper boundary of the ore body during the first drilling.

[0014] In some embodiments, during the layered drilling, after the upper surface of the drill bit abuts against the upper boundary of the ore body during the initial drilling, the drill bit using the inner tube assembly drill bit drills along the inclined direction of the ore body. The inner tube assembly drill bit includes an inner tube portion and a drilling rig portion. The inner tube portion is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion, and also includes:

[0015] The drilling proceeds in layers until the final drilling operation, during which the lower surface of the drill bit comes into contact with the lower surface of the ore body.

[0016] In some embodiments, the drilling using the inner tube assembly drill bit along the inclined direction of the ore body, the inner tube assembly drill bit comprising an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe for accommodating the separated ore body formed after being cut by the drilling rig portion, includes:

[0017] During drilling, coolant is injected into the borehole through the internal channel of the drill pipe.

[0018] In some embodiments, injecting coolant into the borehole from an internal channel in the drill pipe during the drilling process includes:

[0019] Collect the coolant that overflows from the borehole during drilling.

[0020] In some embodiments, after drilling stops once the inner tube section is fully loaded, and the drilling rig is separated by a traction system and the inner tube section is detached from the mined ore body, the mining method for the slightly inclined, extremely thin, precious ore body further includes:

[0021] The working face and the drilled holes after mining are cleaned with water, and mineral powder and fine mineral pieces are recovered at the water confluence point using filter cloth and perforated water tank.

[0022] In some embodiments, the drilling using the inner tube assembly drill bit along the inclined direction of the ore body, the inner tube assembly drill bit including an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion, includes:

[0023] Along the ore body, a certain length is mined each time, leaving a portion of low-quality ore body as a pillar to support the void.

[0024] In some embodiments, the drilling using the inner tube assembly drill bit along the inclined direction of the ore body, the inner tube assembly drill bit including an inner tube portion and a drilling rig portion, the inner tube portion being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion, includes:

[0025] During drilling, keep the drill bit parallel to the strike of the ore body.

[0026] This invention provides a method for mining a slightly inclined, extremely thin, precious ore body, comprising: excavating a transport roadway along the strike of the ore body and intermittently excavating a direct mining roadway using a tunneling machine; drilling along the inclined direction of the ore body using an inner tube assembly drill bit, wherein the inner tube assembly drill bit includes an inner tube part and a drilling rig part, the inner tube part being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part; stopping drilling after the inner tube part is fully loaded, separating the drilling rig part and detaching the inner tube part from the mined ore body using a traction system; and using a ore transport vehicle to remove the ore.

[0027] From developing the main network along the transport roadways to forming the borehole entrance in the mechanical direct mining roadway; the drill bit cuts the ore body, and the crushed ore directly enters the inner pipe for in-situ collection; after being fully loaded, the traction system separates the drill bit and pulls out the inner pipe; the ore transport car carries the ore to complete the mining work.

[0028] This solution addresses the problems of low mining efficiency, significant ore loss and dilution, high labor intensity, and poor safety in gently dipping, extremely thin ore bodies due to limited working space. It constructs an efficient logistics network through a tunneling system, integrating cutting and collection via an internal tube assembly drill bit, avoiding the severe over-excavation and under-excavation, long blasting fume dissipation time, and high blasting vibration associated with traditional blasting methods. A traction system precisely separates the drill bit to avoid disturbing the surrounding rock, and real-time full-load monitoring shortens the interval between processes. Finally, short-distance connections between the mechanical direct mining roadway and the ore transport vehicle integrate all aspects into a continuous production line. Optimized roadway layout ensures stope structural stability, in-situ internal tube collection reduces residual ore fragments, and simultaneous drilling and mining reduces auxiliary operation time, comprehensively resolving the core contradictions in the mining of extremely thin ore bodies.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0031] Figure 1 This is a schematic diagram of the basic method steps of a mining method for a slightly inclined, extremely thin precious ore body provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram illustrating the optimized steps for drill bit selection in a mining method for a slightly inclined, extremely thin, precious ore body provided by an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram illustrating the optimized steps for selecting a cutting method in a mining method for a micro-inclined, extremely thin, precious ore body provided by an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram illustrating the optimized steps of layered mining in a mining method for a slightly inclined, extremely thin, precious ore body provided in an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram illustrating further optimization steps of the layered mining method for a micro-inclined, extremely thin, precious ore body provided in an embodiment of the present invention.

[0036] Figure 6 This is a schematic diagram of the cooling steps during mining in a method for mining a slightly inclined, extremely thin, precious ore body according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram illustrating the optimized steps of coolant collection in a mining method for a micro-inclined, extremely thin, precious ore body according to an embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram illustrating the optimized steps of post-mining site treatment in a mining method for a slightly inclined, extremely thin, precious ore body provided in an embodiment of the present invention.

[0039] Figure 9 This is a schematic diagram illustrating the optimized steps of goaf support in a mining method for a micro-inclined, extremely thin, precious ore body provided in an embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram illustrating the optimized drilling process in a mining method for a slightly inclined, extremely thin, precious ore body, as provided in an embodiment of the present invention. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0050] Reference Figure 1 A method for mining a slightly inclined, extremely thin precious ore body, comprising:

[0051] S101. Drive along the ore body strike and excavate the haulage roadway along the vein, and excavate the mechanical direct mining roadway at intervals. Specifically, firstly, drive along the ore body strike and excavate the haulage roadway along the vein, and excavate the mechanical direct mining roadway at intervals. The haulage roadway along the vein serves as the main roadway for ore transportation, while the intermittently set mechanical direct mining roadway serves as the operation channel for drilling and mining equipment to enter the ore body. The purpose is to build a basic network for mechanized mining in a limited space, avoid the risk of frequent manual entry into the empty area required by traditional shallow hole mining, and at the same time provide a precise positioning benchmark for subsequent directional drilling.

[0052] S102. Drilling is carried out along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit consists of an inner tube part and a drilling rig part. The inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part. Specifically, drilling is carried out along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit consists of a drilling rig part and an inner tube part. The drilling rig part directly separates the ore and rock using a rotary cutting method, while the inner tube part, as a hollow pipe, advances synchronously with the drill bit. Its core function is to accommodate the cut ore fragments in real time and isolate the surrounding rock from mixing in. This design significantly reduces the waste rock mixing rate (i.e., dilution rate) by physically isolating the cutting area from the contact surface of the surrounding rock, and has high recovery efficiency. Compared with the separate mining and transportation process, it reduces the manual intervention links, and avoids the problems of complex preparation layout, high labor intensity, cumbersome operation procedures and long recovery cycle in the recovery work of gently dipping ore bodies where the ore is stuck in the empty area due to insufficient gravity (i.e., difficult to self-flow).

[0053] S103. Drilling stops when the inner pipe section is fully loaded. The drilling rig section is separated from the mining body by the traction system. Specifically, when drilling stops when the inner pipe section is fully loaded, it indicates that the amount of ore cut in a single operation has reached the upper limit of the container. At this time, the drilling rig section is separated from the mining body by the traction system, and the inner pipe section is separated from the mining body. The traction system (such as a winch or hydraulic jacking mechanism) pulls the fully loaded inner pipe out in the opposite direction along the borehole trajectory. This process ensures that the cut ore is directly transported away from the mining area in a closed pipe, avoiding the secondary dilution caused by multiple ore handling processes and ore exposure to voids in traditional processes. At the same time, it avoids the risk of collapse for personnel working in unsupported areas.

[0054] S104. Use ore transport cars for ore removal. Specifically, ore transport cars connect to the inner pipe outlet in the mechanical direct mining roadway to achieve seamless transfer of ore from the mining area to the transportation system. Their ability to directly load pre-separated ore improves transportation efficiency and reduces labor intensity, especially for precious metal ore bodies, reducing the loss of high-value fragments.

[0055] The spatial layout of the haulage roadways and mechanical direct mining roadways provides a stable working face for directional drilling. Compared to traditional preparatory processes, this solution has a lower dependence on ore passes and ventilation shafts, simplifying the preparatory work layout. The integrated cutting and collection function of the inner tube assembly drill bit enables in-situ separation of ore and rock, controlling dilution from the source. The traction system-driven rapid removal mechanism for fully loaded inner tubes ensures continuous mining and improves overall operational efficiency. The efficient transport of ore by ore trucks completes the resource recovery loop. The overall solution reduces manual labor through full-process mechanization, mitigating the risk of empty areas while minimizing ore loss and dilution rates, making it particularly suitable for the economical mining of high-priced, extremely thin ore bodies such as gold.

[0056] In some implementations, refer to Figure 2 In S102, drilling along the dip direction of the ore body using an inner tube assembly drill bit, which includes an inner tube section and a drilling rig section, with the inner tube section being a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig section, the mining method for slightly dipped, extremely thin, precious ore bodies also includes:

[0057] S1001. Select the drill bit and drill rod combination according to the thickness of the ore body. When the thickness of the ore body is less than the diameter of the drill bit, select the smallest applicable drill bit that is greater than the thickness of the ore body. Specifically, before drilling along the dip direction of the ore body using the inner tube assembly drill bit, it is necessary to select the drill bit and drill rod combination according to the thickness of the ore body. The drill bit selection here must strictly match the actual thickness of the ore body. When the thickness of the ore body is less than the diameter of the drill bit, the smallest applicable drill bit larger than the thickness of the ore body should be selected. For example, when the thickness of the ore body is 0.1 meters, a 0.2-meter diameter drill bit should be selected instead of a 0.3-meter diameter drill bit. The distance between the hanging wall and footwall of an extremely thin ore body is very close. If the diameter of the drill bit is smaller than the thickness of the ore body, it will result in residual ore edge. If the drill bit is much larger than the thickness of the ore body, it will cut excessive surrounding rock. Selecting the smallest applicable drill bit ensures that the cutting boundary fits the contour of the ore body precisely by matching the geometric relationship between the borehole diameter and the thickness of the ore body. This avoids residual ore and reduces the mixing of waste rock, thereby minimizing the cutting range of the surrounding rock while ensuring that the drill bit completely covers the cross section of the ore body, thus controlling the dilution rate from the source.

[0058] The direct mining roadway provides a directional reference surface for the drilling rig, while the precise selection of the drill bit size ensures that the drilling path extends strictly along the dip of the ore body within a limited space. Together, they solve the problems of repeated roadway repairs and manual cleaning of residual ore caused by the mismatch between equipment and ore body size in traditional processes, significantly improving the efficiency of mining valuable ore bodies.

[0059] It is important to note that the feasibility of this step depends on the accuracy of the mine geological exploration data. At the engineering site, the thickness distribution model of the ore body must first be determined by core sampling from boreholes, and then dynamically matched with the drill bit specifications in the drilling rig's storage. This avoids the loss of valuable ore bodies caused by human experience-based judgment, and is especially suitable for high-value ore bodies such as gold with stringent requirements for resource recovery rates.

[0060] In some implementations, refer to Figure 3 In S1001, the method for mining slightly inclined, extremely thin, valuable ore bodies, after selecting the combination of drill bit and drill rod according to the ore body thickness and choosing the smallest applicable drill bit larger than the ore body thickness when the ore body thickness is smaller than the drill bit diameter, also includes:

[0061] S1002. Select single-pass drilling or layered drilling based on the relationship between drill bit diameter and ore body thickness. For slightly inclined, extremely thin, valuable ore bodies, select single-pass drilling or layered drilling based on the relationship between drill bit diameter and ore body thickness to achieve more economical and efficient full-thickness mining of thin veins in valuable ore bodies. Specifically, when the drill bit diameter is greater than the ore body thickness—for example, a ore body thickness of 0.25 meters, using a 0.3-meter drill bit, and employing a single-drilling mode—the drill bit diameter is only slightly larger than the ore body thickness, allowing the drill bit cutting surface to completely cover the ore body cross-section, while limiting over-excavation and reducing dilution rate. The hollow pipe of the inner tube assembly directly wraps around the cutting area, achieving in-situ isolation of ore and rock, preventing surrounding rock from mixing in from the source, further reducing dilution rate, and achieving in-situ separation of ore and rock. The single-drilling mode relies on the geometric matching of the drill bit and ore body, combined with the closed collection of the inner tube assembly, to strictly limit over-excavation at the drill bit edge. The inner tube wall is tightly attached to the cutting boundary, reducing the surrounding rock mixing rate, while avoiding the vibration caused by traditional blasting ore extraction leading to misalignment between the ore body and surrounding rock. However, when the largest drill bit... When the diameter of the drill bit is less than the thickness of the ore body—for example, when the ore body is 0.6 meters thick and the maximum diameter of the drill bit is 0.3 meters, layered drilling is activated. This is because the diameter of the drill bit is significantly smaller than the thickness of the ore body, and a single full-thickness drilling cannot completely cut the ore body. Forced drilling would result in ore body residue. The layered strategy decomposes the ore body into layers by breaking it down into multiple drilling operations along its height. The layered drilling mode dynamically reconstructs the cutting unit through layered operations—for example, during the first drilling operation, the top surface of the drill bit abuts against the upper boundary of the ore body, cutting the upper layer of ore and storing it in the inner tube; during the last drilling operation, the bottom surface of the drill bit fits against the lower boundary of the ore body, completely recovering the residual ore layer. During this process, the over-excavation amount of each layer is independently controlled, further controlling ore dilution, while avoiding the process of manually cleaning the residue between layers required in traditional layered mining.

[0062] In some implementations, refer to Figure 4 In S102, drilling is performed along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit includes an inner tube section and a drilling rig section. The inner tube section is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig section, including:

[0063] S1021. Perform layered drilling. During the first drilling, the upper surface of the drill bit abuts against the upper boundary of the ore body. Specifically, in practice, the triggering logic for layered drilling is based on the dynamic matching of equipment capacity and ore body thickness: when the maximum diameter of the available drill bit is less than the thickness of the ore body (for example, the ore body is 0.6 meters thick while the maximum diameter of the drill bit is only 0.3 meters), a single drilling cannot cover the full thickness of the ore body. The ore body in the height direction needs to be decomposed into multiple cutting units (such as two layers, each layer being 0.3 meters thick). During the initial drilling, the upper surface of the drill bit precisely contacts the upper boundary of the ore body (i.e., the interface of the hanging wall of the ore body), using boundary positioning to constrain the cutting trajectory—ensuring that the cutting surface strictly extends along the top plate of the ore body through physical contact. At this time, the drill bit diameter matches the current layer thickness, limiting the over-excavation to a minimum, thereby isolating the intrusion of the hanging wall rock from the source. Simultaneously, the hollow pipe of the inner tube assembly synchronously wraps the cutting area to achieve in-situ ore collection, avoiding the time loss and secondary ore loss caused by manual cleaning of interlayer residues in traditional layered mining. Through physical contact, the cutting surface is ensured to strictly extend along the top plate of the ore body, thereby controlling the over-excavation.

[0064] In some implementations, refer to Figure 5 During the layered drilling, after the upper surface of the drill bit contacts the upper boundary of the ore body during the first drilling, S102, the drill bit with the inner tube assembly is used to drill along the inclined direction of the ore body. The inner tube assembly includes an inner tube part and a drilling rig part. The inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part. It also includes:

[0065] S1022. From the initial drilling to the final drilling, the lower surface of the drill bit abuts against the lower surface of the ore body during the final drilling. Specifically, by ensuring the lower surface of the drill bit abuts against the lower surface of the ore body during the final drilling, ore loss due to residual ore layers at the bottom is avoided during layered mining. When the maximum diameter of the available drill bit is less than the thickness of the ore body, the layered drilling mode is activated, decomposing the ore body into multiple cutting units in the height direction (e.g., 2 layers, each 0.3 meters thick). During the final drilling, the lower surface of the drill bit precisely abuts against the lower boundary of the ore body (i.e., the interface of the footwall rock of the ore body). Through physical contact, it is ensured that the cutting trajectory strictly extends along the bottom plate of the ore body, achieving a low-gap fit between the bottom surface of the drill bit and the bottom plate of the ore body, thereby maximizing the recovery of residual ore from the bottom layers. Simultaneously, the hollow pipe of the inner tube assembly synchronously wraps around the cutting area, enabling in-situ collection of ore fragments and avoiding ore retention caused by the gentle dip angle of the ore body during traditional manual cleaning of residual layers.

[0066] The purpose of this embodiment is to construct a cyclical cutting process for the roof, layers, and floor. After the initial drilling establishes the roof benchmark, each layer is mined sequentially. The final drilling achieves spatial coordination through floor contact, forming a three-dimensional positioning system in conjunction with the spatial constraints of the roadway system. This design is particularly suitable for complex occurrence conditions with large fluctuations in ore body thickness (such as lenticular ore bodies with a thickness of 0.25-0.6 meters). When it is determined that layered drilling is required, the final contact operation can adaptively adjust the cutting position of the last layer without manual intervention in floor elevation measurement. This avoids ore residue caused by undulations in the ore body floor and also avoids the damage to the stability of the surrounding rock caused by blasting. It provides a low-loss, high-precision industrial solution for slightly inclined, extremely thin ore bodies.

[0067] In some implementations, refer to Figure 6 In S102, drilling is performed along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit includes an inner tube section and a drilling rig section. The inner tube section is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig section, including:

[0068] S1023. During drilling, coolant is injected into the borehole through the internal channel of the drill rod. This process, where coolant is injected into the borehole through the internal channel of the drill rod during drilling along the dip direction of the ore body using the drill bit with the inner tube assembly, addresses the high drill bit wear rate and high loss rate of ore powder and cuttings caused by frictional high temperatures during mechanical cutting drilling.

[0069] Specifically, the coolant is injected into the borehole through the internal channels of the drill rod in a closed-loop circulation manner, thereby preventing the diamond composite sheet of the alloy drill bit from falling off and failing due to high temperature. At the same time, the coolant forms a directional liquid-solid two-phase flow in the borehole, suspending and carrying the fine mineral powder and rock cuttings generated during cutting to the borehole outlet, avoiding resource loss caused by mineral powder remaining in the goaf. The hollow pipe of the inner tube not only collects ore fragments in the cutting area, but its pipe wall and the gap between the borehole form a coolant return channel, allowing the injected coolant to flow back upward along the annular gap of the pipe wall, realizing dynamic circulation of the coolant, thereby enabling the coolant to effectively transfer heat.

[0070] The core engineering challenge addressed in this embodiment is the problem of thermal damage and fine particle recovery during the mechanical cutting of extremely thin ore bodies. While mechanical drilling can achieve precise cutting, continuous frictional heat accelerates drill bit failure, and fine precious metal particles are easily dispersed with dust during dry drilling. This solution achieves a dual control effect through coolant injection into the internal channels of the drill pipe: First, the coolant directly contacts the cutting surface, transferring heat to the surrounding rock medium through forced convection heat transfer, thus extending the drill bit's lifespan; second, the viscosity of the coolant overcomes the gravity of the ore, causing fine mineral particles to move along the flow direction in gently inclined boreholes, solving the problem of ore debris and powder retention when the inclination angle is too small. This design is particularly suitable for mining high-value ore bodies—for example, gold ore bodies are prone to amalgamation loss under high-temperature friction, while the coolant simultaneously inhibits oxidation, reducing the loss rate of active ore components.

[0071] In some implementations, refer to Figure 7 In S1023, during drilling, coolant is injected into the borehole through the internal channel of the drill pipe, including:

[0072] S10231. Collecting coolant overflowing from the borehole during drilling. By simultaneously injecting coolant into the borehole through the internal channel of the drill pipe during drilling, the problem of loss of fine mineral powder and pollution of the working environment caused by disorderly overflow of coolant during mechanical cutting drilling is solved. Specifically, after the coolant is injected into the borehole through the internal channel of the drill pipe in a closed-loop circulation manner, the overflow portion is collected directionally through the annular return channel formed by the gap between the inner tube and the borehole. When the coolant carries the fine mineral powder generated by cutting and overflows from the borehole, it flows upward along the annular gap between the outer wall of the inner tube and the borehole rock wall, forming a stable liquid-solid two-phase flow. The collection system is equipped with filter cloth and sedimentation tank at the borehole outlet. The physical interception effect of the filter cloth separates the mineral powder from the coolant. The injection of coolant not only reduces the friction temperature of the drill bit through heat conduction, but also suspends the fine mineral particles through viscosity to prevent them from being trapped in the goaf. The collection of overflow coolant further recovers residual precious metal particles, thereby reducing the residue of mineral particles in the goaf. While ensuring the sustainable operation of the equipment, it achieves resource recovery and reduces environmental impact, providing a low-loss and highly environmentally friendly industrial solution for micro-inclined, ultra-thin precious ore bodies.

[0073] In some implementations, refer to Figure 8 After drilling stops at S103 and the inner pipe section is fully loaded, the drilling rig is separated using a traction system, and the inner pipe section is detached from the mined ore body. Other methods for mining slightly inclined, extremely thin, precious ore bodies include:

[0074] S1003. Water flushing is performed on the working face and post-mining boreholes in the goaf, and filter cloth and perforated water troughs are used to recover ore powder and fine ore fragments at the water convergence point. Drilling is stopped after the inner pipe section is fully loaded. The drilling rig is then separated from the mined ore body via the traction system, and water flushing is performed on the working face and post-mining boreholes in the goaf. Filter cloth and perforated water troughs are used to recover ore powder and fine ore fragments at the water convergence point. This avoids the high ore loss rate and environmental pollution problems caused by fine-grained precious metal residues during mechanical cutting drilling.

[0075] The flushing and cleaning system utilizes the natural slope of the gently sloping tunnel to guide the water flow in a directional manner, requiring no additional power. The filter cloth interception and perforated water tank graded recycling design are designed to capture mineral powder of different particle sizes in a differentiated manner—the filter cloth captures high-grade fine particles, while the perforated water tank collects low-grade fine fragments (such as mineral fragments mixed in with surrounding rock with a particle size of 1-5 mm). The two work together to achieve refined resource recovery.

[0076] In some implementations, refer to Figure 9 In S102, drilling is performed along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit includes an inner tube section and a drilling rig section. The inner tube section is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig section, including:

[0077] S1024. During each mining run along the dip direction of the ore body, a portion of low-quality ore body is left as a pillar support void. By implementing this practice during drilling along the dip direction of the ore body using the inner tube assembly drill bit, a portion of low-quality ore body is left as a pillar support void at each mining run, thus avoiding the high risk of roof spalling caused by continuous mining due to roof exposure in the void.

[0078] In some implementations, refer to Figure 10 In S102, drilling is performed along the dip direction of the ore body using an inner tube assembly drill bit. The inner tube assembly drill bit includes an inner tube section and a drilling rig section. The inner tube section is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig section, including:

[0079] S1025. During drilling, the drill bit should be kept parallel to the ore body strike. Specifically, by using the inner tube assembly drill bit to drill along the dip direction of the ore body, the drill bit should be kept parallel to the ore body strike. The continuity of the ore body strike allows the drill bit to cover a larger area of ​​the ore body without frequent angle adjustments. The hollow pipe of the inner tube section directly collects the cut ore fragments, thus avoiding the problems of high ore residue and low mining efficiency caused by changes in the ore body shape.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

[0081] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A method for mining a slightly inclined, extremely thin, precious ore body, characterized in that, include: The ore body is excavated along the vein transport roadway, and the excavation machinery is used to directly mine the roadway at intervals; The drill bit is used to drill along the dip direction of the ore body. The drill bit includes an inner tube part and a drilling rig part. The inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part. A certain length is mined each time along the dip direction of the ore body, leaving a part of low-quality ore body as a pillar support void. Drilling stops once the inner tube section is fully loaded. The drilling rig is then separated from the mining body via the traction system, and the inner tube section is detached from the mined ore body. Minerals are transported out using ore trucks.

2. The method for mining a slightly inclined, extremely thin, precious ore body according to claim 1, characterized in that, Before drilling along the inclined direction of the ore body using the inner tube assembly drill bit, wherein the inner tube assembly drill bit includes an inner tube part and a drilling rig part, and the inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part, the mining method of the slightly inclined, extremely thin, precious ore body further includes: Select the drill bit and drill rod combination according to the thickness of the ore body. When the thickness of the ore body is less than the diameter of the drill bit, select the smallest applicable drill bit that is larger than the thickness of the ore body.

3. The method for mining a slightly inclined, extremely thin, precious ore body according to claim 2, characterized in that, In the method for mining micro-inclined, extremely thin, valuable ore bodies, after selecting the combination of drill bit and drill rod based on the ore body thickness, and selecting the smallest applicable drill bit larger than the ore body thickness when the ore body thickness is smaller than the drill bit diameter, the method further includes: The choice between single-pass drilling or layered drilling is made based on the relationship between the drill bit diameter and the thickness of the ore body.

4. A method for mining a slightly inclined, extremely thin, precious ore body according to claim 1 or 3, characterized in that, The drilling process utilizes an inner tube assembly drill bit to drill along the inclined direction of the ore body. The inner tube assembly drill bit comprises an inner tube portion and a drilling rig portion. The inner tube portion is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion. Layered drilling is carried out, with the upper surface of the drill bit contacting the upper boundary of the ore body during the first drilling.

5. The method for mining a slightly inclined, extremely thin, precious ore body according to claim 4, characterized in that, In the aforementioned layered drilling, after the upper surface of the drill bit abuts against the upper boundary of the ore body during the initial drilling, the drill bit using the inner tube assembly drill bit drills along the inclined direction of the ore body. The inner tube assembly drill bit includes an inner tube part and a drilling rig part. The inner tube part is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig part, and also includes: The drilling proceeds in layers until the final drilling operation, during which the lower surface of the drill bit comes into contact with the lower surface of the ore body.

6. The method for mining a slightly inclined, extremely thin, precious ore body according to claim 1, characterized in that, The drilling process utilizes an inner tube assembly drill bit to drill along the inclined direction of the ore body. The inner tube assembly drill bit comprises an inner tube portion and a drilling rig portion. The inner tube portion is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion. It includes: During drilling, coolant is injected into the borehole through the internal channel of the drill pipe.

7. The method for mining a slightly inclined, extremely thin, precious ore body according to claim 6, characterized in that, During the drilling process, coolant is injected into the borehole through the internal channels of the drill pipe, including: Collect the coolant that overflows from the borehole during drilling.

8. A method for mining a slightly inclined, extremely thin, precious ore body according to claim 1 or 7, characterized in that, After drilling stops when the inner tube section is fully loaded, and the drilling rig is separated from the mined ore body by using a traction system, the method for mining the slightly inclined, extremely thin, precious ore body further includes: The working face and the drilled holes after mining are cleaned with water, and mineral powder and fine mineral pieces are recovered at the water confluence point using filter cloth and perforated water tank.

9. A method for mining a slightly inclined, extremely thin, precious ore body according to claim 1, characterized in that, The drilling process utilizes an inner tube assembly drill bit to drill along the inclined direction of the ore body. The inner tube assembly drill bit comprises an inner tube portion and a drilling rig portion. The inner tube portion is a hollow pipe used to accommodate the separated ore body formed after being cut by the drilling rig portion. During drilling, keep the drill bit parallel to the strike of the ore body.

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