A mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies

Abstract

The present invention discloses a mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies, and belongs to the technical field of underground mining of metal ore deposits. The present invention first divides the stage into sections, and the sections are divided into zones along the direction of the ore body. Each section adopts a through-vein tunnel to connect the multi-layer ore body. The multi-layer ore body adopts the mining method of the in-field inclined tunnel formed by mining and filling, and determines the first mining layer of the multi-layer ore body. After that, the stage along-vein transport tunnel is used to dig downhill into the mining field connecting road to recover the next layer of the first mining layer. After the recovery is completed, an artificial false roof is constructed to serve the recovery of the ore body in the next stage. Then, the first mining layer is excavated from the through-vein tunnel to the inside of the ore body, and the in-field horizontal tunnel along the vein is connected to the adjacent zone in the field to serve the layered recovery and ventilation. After the first mining layer is recovered, all cementation filling is adopted. After that, the in-field horizontal tunnel along the vein is used to pick the top and fill the bottom to form the next layer in-field inclined tunnel. The present invention proposes connecting the ore bodies with through-vein tunnels for multiple layers of steeply inclined thin ore bodies, adopts the same mining system, changes the previous form of constructing a new mining project for each layer of ore body, effectively reduces the investment in mine mining projects, and classifies the mining process as a part of ore recovery, reducing the amount of waste rock in mine mining projects.

Description

Technical Field

[0001] The invention belongs to the technical field of underground mining of metal ore deposits, and in particular relates to a mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies. Background Art

[0002] For multi-layer steeply inclined thin ore bodies, the commonly used mining methods are the ore retention method and the upward layered filling method. The ore retention method has the disadvantages of large mining and cutting engineering, and the inability to apply mechanized rock drilling equipment, resulting in low operating efficiency. The currently used upward layered filling method mines the interlayer together with the ore or builds multiple sets of mining and calibration systems to serve the recovery of the ore body, resulting in a significant increase in the ore depletion rate and too much capital investment in the mining and calibration project; in addition, the traditional upward horizontal layered filling mining method generally uses the method of off-vein mining and calibration according to the occurrence conditions of the ore body; for multi-layer steeply inclined thin ore bodies, the use of off-vein mining and calibration will result in a too high 1,000-ton mining and cutting ratio, and the overall benefits of the ore cannot be fully utilized. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the present invention proposes a mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies, comprising the following steps:

[0005] (1) Zoning: The vein is divided into stages, the stages are divided into sections, the sections are divided into zones along the strike, and the zones are divided into layers upwards, with a layer height of 5 to 6 m;

[0006] (2) Mining and cutting project layout: The first layer of ore body is excavated from the lower plate of the first layer of ore body to the stage of vein transportation tunnel, and the vein-crossing tunnel is excavated from the stage of vein transportation tunnel to penetrate the multi-layer ore body; then, the stage of vein transportation tunnel is excavated downhill to the mining field connecting road to mine the lower layer of the first mining layer. After the mining is completed, an artificial false roof is constructed to serve the mining of the next stage of ore body; after the artificial false roof is constructed, the vein-crossing tunnel is excavated to the first mining layer field along the vein horizontal tunnel to serve the mining of the layer of ore body, and the field along the vein horizontal tunnel penetrates the adjacent layers. The inclined tunnels in the area are used to form a complete ventilation and filling system for the first mining layer. After the first mining layer is mined, all cement filling is used. After the filling is completed, the inclined tunnels in the first mining layer are formed by picking the top and filling the bottom along the vein in the field, creating mining conditions for the next layer. After the first mining layer is formed, the inclined tunnels in the field are excavated and cut into layers through the inclined tunnels in the adjacent sub-fields, creating conditions for the mining and ventilation of the layer. When the inclined tunnels in the field are excavated, the roof of the inclined tunnels is supported.

[0007] (3) Mining: For ore bodies with a thickness of less than 4 m, the mining plan includes the following steps: the first mining layer is based on the horizontal thickness of the ore body, and the horizontal tunnels along the vein are excavated in the field, and the inclined tunnels in the adjacent sub-fields are connected. When the complete ventilation and filling system of the first mining layer is constructed, the ore body is mined. After the mining of the first mining layer is completed, the remaining layers are mined by excavating the inclined tunnels in the field and cutting the horizontal tunnels in the layers, and the inclined tunnels in the adjacent sub-fields are connected to form a complete ventilation and filling system for the layer. The specifications of the layer cutting horizontal tunnels are determined by the horizontal thickness of the ore body in the layer;

[0008] For the ore body thickness of 4-7m, the mining plan includes the following steps: in the first mining layer, the horizontal tunnel along the vein is driven into the field to connect the inclined tunnel in the adjacent sub-field to form a complete filling and ventilation system for the first mining layer, and the horizontal tunnel along the vein in the field is used as the rock drilling space and free surface to use horizontal blast holes to blast the ore; after the first mining layer is mined, the remaining layers are mined by driving the layered cutting horizontal tunnel in the field inclined tunnel to connect the inclined tunnel in the adjacent sub-field to form a complete ventilation and filling system for the layer; the layered cutting horizontal tunnel is used as the free surface and rock drilling space to expand the wall of the layer;

[0009] (4) Filling: After the first mining layer is mined, all cemented filling is adopted. In order to serve the next stage of ore body mining, an artificial false roof needs to be built in the next layer of the first mining layer. The top height of the remaining layers is controlled to be 5-6m. Filling is carried out after the mining is completed. During the filling process, an inclined tunnel is constructed in each layer. The inclined tunnel is constructed in the field by combining waste rock dam and filling body. The slope of the waste rock dam is controlled at 15%-20% and the height is 4m. Non-cemented filling is used for the bottom layer with a filling height of 3.5m. The remaining 0.5m is filled with cemented filling. The compressive strength of the surface layer reaches 1.2-1.5MPa. After the filling is completed, C15 concrete is poured for 0.1m as the inclined tunnel road surface.

[0010] As a preferred embodiment of the present invention, in step (1), the area is divided into two adjacent in-field inclined tunnels, and the length is 100-150m, which is the horizontal distance between the two adjacent in-field inclined tunnels.

[0011] As a preferred embodiment of the present invention, in step (2), the slope of the inclined tunnel in the mining layer field is controlled at 15% to 20%.

[0012] As a preferred embodiment of the present invention, in the step (4), the artificial false ceiling is constructed by laying a steel mesh, with longitudinal reinforcement of φ18 round steel and a steel bar spacing of 200mmⅹ200mm, and transverse reinforcement of φ12 round steel and a steel bar spacing of 300mmⅹ300mm; the steel mesh is arranged in a single row, the distance between the steel mesh and the tunnel wall is greater than 50mm, and the thickness of the steel bar protective layer is less than 50mm.

[0013] As a preferred embodiment of the present invention, in step (3), during the mining process, a drilling rig is used to drill horizontal blastholes with a blasthole diameter of 38-42 mm, a blasthole depth of 2-2.2 m, and a blasthole spacing of 1.2-1.5 m.

[0014] As a preferred embodiment of the present invention, in step (3), the specific route of the mine ventilation is as follows: during the mining process, fresh air flows from the vein-penetrating tunnel into the inclined tunnel within the mine and then into the mine; after washing the mine, the air flows through the inclined tunnel within the adjacent sub-area mine, the vein-penetrating tunnel, and the segmented veins into the return air system.

[0015] As a preferred embodiment of the present invention, 3m 3 Diesel shovel loaders are used to mine; in areas or sections that are more than 200m away from the chute, 15-20t trucks are used in conjunction with shovel loaders to mine.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention adopts a through-vein tunnel to penetrate multiple layers of ore bodies, so that the same mining system can be used for multiple layers of steeply inclined thin ore bodies. This fundamentally changes the previous form of constructing a new mining project for each layer of ore body, effectively reduces the investment in mining projects, and includes the mining process as a part of ore recovery, greatly reducing the amount of waste rock in mining projects, thereby achieving safe and green mining.

[0018] (2) The present invention designs a method for recovering multi-layer steeply inclined thin ore bodies, which uses the in-field vein lanes and layered cutting lanes to penetrate the adjacent sub-field inclined lanes to form a complete ventilation system for the layer, and uses the in-field vein lanes and layered cutting lanes as free surfaces and rock drilling spaces to expand the ore body of the layer. At the same time, the vein mining method is adopted, and the vein mining inclined lane construction method combining waste rock dam and filling body is used to arrange the mining project in the vein, effectively reducing the thousand-ton mining and cutting ratio of the mining field.

[0019] (3) The present invention has a 1,000-ton mining and cutting ratio of 4 to 6 m / kt, an ore loss rate of 5 to 10%, and an impoverishment rate of about 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a longitudinal section (Ⅰ-Ⅰ) of the principle diagram of a mining method suitable for mechanized upward layered filling of multi-layered steeply inclined thin ore bodies.

[0021] Figure 2 This is a cross-sectional diagram (Ⅱ-Ⅱ) of the principle diagram of a mining method suitable for mechanized upward layered filling of multi-layered steeply inclined thin ore bodies.

[0022] Figure 3 This is a plan view of the principle diagram of the mining method suitable for mechanized upward layered filling of multi-layered steeply inclined thin ore bodies (III-III).

[0023] 1-stage transport tunnel along the vein; 2-on-site horizontal tunnel along the vein; 3-through-vein tunnel; 4-on-site inclined tunnel; 5-concrete pavement; 6-uncemented filling body; 7-cemented filling body; 8-waste rock dam; 9-segmented tunnel along the vein; 10-layered cutting horizontal tunnel. DETAILED DESCRIPTION

[0024] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0025] Example 1

[0026] A mechanized upward layered filling mining method for in-field mining of double-layered thin ore bodies with small interlayer spacing, specifically comprising the following steps:

[0027] (1) Determination of stope structure and parameters: The ore vein is divided into stages, and the stages are divided into sections. The section height is controlled at 15m. The sections are divided into zones along the strike. The length of the zones is determined by the horizontal distance between two adjacent inclined tunnels in the field. The zones are divided into layers, and the layer height is 5m.

[0028] (2) Mining and cutting project layout: The first layer of ore body is excavated from the lower plate of the stage along the vein transport tunnel, and the stage along the vein transport tunnel is excavated to penetrate the multi-layer ore body. After that, the stage along the vein transport tunnel is excavated downward to the mining field connecting road to recover the lower layer of the first mining layer. After the recovery is completed, an artificial false roof is constructed to serve the recovery of the next stage of ore body. After the artificial false roof is constructed, the first mining layer field along the vein horizontal tunnel is excavated from the through-vein tunnel to serve the recovery of the layered ore body. The field along the vein horizontal tunnel runs through the adjacent sub-field inclined tunnel to form a complete first mining layer ventilation and filling system. After the recovery of the first mining layer, all cementing filling is used. After the filling is completed, the field along the vein horizontal tunnel is topped and bottomed to form the first mining layer field inclined tunnel. The inclined tunnel is controlled at a slope of 15% to create mining conditions for the next layer recovery. When the inclined tunnel in the first mining layer is formed, the inclined tunnel is excavated in layers to cut the horizontal tunnel and connect the inclined tunnel in the adjacent sub-area to create conditions for the mining and ventilation of the layer. When the inclined tunnel is excavated in the mining site, the roof of the inclined tunnel needs to be supported to ensure the safety of personnel and equipment.

[0029] (3) Mining: For this mine, the horizontal thickness of the multi-layer ore body is less than 4m, so the stratified ore body is mined by the approach method, that is, the process of excavating the horizontal tunnel along the vein and the stratified cutting tunnel in the field is the mining process of the ore body in this layer. The details are as follows: The first stratified mining is based on the horizontal thickness of the ore body. The horizontal tunnel along the vein in the field is excavated, and the inclined tunnel in the adjacent sub-field is connected. The ore body is mined when the complete ventilation and filling system of the first stratified mining is constructed. After the mining of the first stratified mining is completed, the remaining stratified mining is carried out by excavating the stratified cutting tunnel in the field inclined tunnel and connecting the inclined tunnel in the adjacent sub-field to form a complete ventilation and filling system for the stratified mining. The specifications of the stratified cutting tunnel are determined by the horizontal thickness of the ore body in the stratified mining. During the mining process, a rock drilling rig is used to drill horizontal blastholes with a blasthole diameter of 38mm, a blasthole depth of 2.2m, and a blasthole spacing of 1.2m. The specific route of mining site ventilation is as follows: during the mining process, fresh air flows from the through-vein tunnel into the inclined tunnel within the site and then into the mining site; after washing the mining site, the air flows through the inclined tunnels within the adjacent sub-site, the through-vein tunnel, and the segmented along-vein into the return air system.

[0030] (4) Filling: After the first mining layer is mined, all cemented filling is adopted. In order to serve the next stage of ore body mining, an artificial false roof needs to be constructed in the next layer of the first mining layer. The construction method of the artificial false roof is: laying steel mesh, longitudinal reinforcement φ18 round steel, steel spacing 200mm×200mm, transverse reinforcement φ12 round steel, steel spacing 300mm×300mm; the steel mesh is arranged in a single row, the distance between the steel mesh and the tunnel wall is greater than 50mm, and the thickness of the steel protection layer is less than 50mm. The top height of the remaining layers is controlled at 5-6m. After the mining is completed, filling is carried out. During the filling process, an inclined tunnel is constructed in each layer. The method of combining waste rock dam and filling body is used to construct the mining inclined tunnel in the field. The slope of the waste rock dam is controlled at 15% and the height is 4m. The bottom layer is filled with non-cemented filling, the filling height is 3.5m, and the remaining 0.5m is filled with cemented filling. The compressive strength of the surface layer reaches 1.3MPa. After filling, C15 concrete is used to pour 0.1m as the inclined road surface to meet the equipment operation requirements and the temporary pipeline laying requirements during the filling process, while also controlling the depletion rate.

[0031] In this embodiment, the kiloton mining and cutting ratio is 4.6m / kt, the depletion rate is about 10%, and the loss rate is 8%.

[0032] Example 2

[0033] A mechanized upward layered filling mining method for multi-layer steeply inclined thin ore body in-field mining, specifically comprising the following steps:

[0034] (1) Determination of stope structure and parameters: The ore vein is divided into stages, and the stages are divided into sections. The section height is controlled at 18m. The sections are divided into zones along the strike. The length of the zones is determined by the horizontal distance between two adjacent inclined tunnels in the field. The zones are divided into layers, and the layer height is 5.5m.

[0035] (2) Mining and cutting project layout: The first layer of ore body is excavated from the lower plate of the stage along the vein transport tunnel, and the stage along the vein transport tunnel is excavated to penetrate the multi-layer ore body. After that, the stage along the vein transport tunnel is excavated downward to the mining field connecting road to recover the lower layer of the first mining layer. After the recovery is completed, an artificial false roof is constructed to serve the recovery of the next stage of ore body. After the artificial false roof is constructed, the first mining layer field along the vein horizontal tunnel is excavated from the through-vein tunnel to serve the recovery of the layered ore body. The field along the vein horizontal tunnel runs through the adjacent sub-field inclined tunnel to form a complete first mining layer ventilation and filling system. After the recovery of the first mining layer is completed, all cementing filling is used. After the filling is completed, the field along the vein horizontal tunnel is topped and filled to form the first mining layer field inclined tunnel. The inclined tunnel is controlled at a slope of 18% to create mining conditions for the next layer recovery. When the inclined tunnel in the first mining layer is formed, the inclined tunnel is excavated in layers to cut the horizontal tunnel and connect the inclined tunnel in the adjacent sub-area to create conditions for the mining and ventilation of the layer. When the inclined tunnel is excavated in the mining site, the roof of the inclined tunnel needs to be supported to ensure the safety of personnel and equipment.

[0036] (3) Mining: For this mine, the horizontal thickness of the multi-layer ore body is 4 to 7 meters. The specific mining plan is as follows: the first mining layer is excavated in the field along the vein horizontal tunnel to connect the adjacent sub-division field inclined tunnel, forming a complete filling and ventilation system for the first mining layer, and providing a free face and rock drilling space for the first mining layer mining. After the excavation of the field along the vein horizontal tunnel is completed, the field along the vein horizontal tunnel is expanded and the top is brushed to complete the mining of the layer. After the first mining layer mining and filling are completed, the remaining layers are excavated by the field inclined tunnel layer cutting horizontal tunnel to connect the adjacent sub-division field inclined tunnel, forming a complete ventilation and filling system for the layer, and then the layer cutting horizontal tunnel is used as the free face and rock drilling space to expand the wall and brush the top to complete the mining of the layer ore body. During the mining process, a rock drilling trolley is used to drill horizontal blastholes with a blasthole diameter of 40 mm, a blasthole depth of 2 m, and a blasthole spacing of 1.3 m. The specific route of mining site ventilation is as follows: during the mining process, fresh air flows from the through-vein tunnel into the inclined tunnel within the site and then into the mining site; after washing the mining site, the air flows through the inclined tunnels within the adjacent sub-site, the through-vein tunnel, and the segmented along-vein into the return air system.

[0037] (4) Filling: After the first mining layer is mined, all cemented filling is adopted. In order to serve the next stage of ore body mining, an artificial false roof needs to be constructed in the next layer of the first mining layer. The construction method of the artificial false roof is: laying steel mesh, longitudinal reinforcement φ18 round steel, reinforcement spacing 200mmⅹ200mm, transverse reinforcement φ12 round steel, reinforcement spacing 300mmⅹ300mm; the steel mesh is arranged in a single row, the distance between the steel mesh and the tunnel wall is greater than 50mm, and the thickness of the steel protection layer is less than 50mm. The top height of the remaining layers is controlled at 5-6m. After the mining is completed, filling is carried out. During the filling process, an inclined tunnel is constructed in each layer. The method of combining waste rock dam and filling body is used to construct the inclined tunnel in the field. The slope of the waste rock dam is controlled at 18% and the height is 4.5m. The bottom layer adopts non-cemented filling, the filling height is 4.1m, and the remaining 0.4m adopts cemented filling. The compressive strength of the surface layer reaches 1.3MPa. After filling, C15 concrete is used to pour 0.1m as the inclined road surface to meet the equipment operation requirements and the temporary pipeline laying requirements during the filling process, while also controlling the depletion rate.

[0038] In this embodiment, the mining kiloton cutting ratio is 4.8m / kt, the loss rate is 8%, and the dilution rate is about 10%.

[0039] Example 3

[0040] A mechanized upward layered filling mining method for multi-layer steeply inclined thin ore body in-field mining, specifically comprising the following steps:

[0041] (1) Determination of stope structure and parameters: The ore vein is divided into stages, and the stages are divided into sections. The section height is controlled at 20m. The sections are divided into zones along the strike. The length of the zones is determined by the horizontal distance between two adjacent inclined tunnels in the field. The zones are divided into layers, and the layer height is 6m.

[0042] (2) Mining and cutting project layout: The first layer of ore body is excavated from the lower plate of the stage along the vein transport tunnel, and the stage along the vein transport tunnel is excavated to penetrate the multi-layer ore body. After that, the stage along the vein transport tunnel is excavated downward to the mining field connecting road to recover the lower layer of the first mining layer. After the recovery is completed, an artificial false roof is constructed to serve the recovery of the next stage of ore body. After the artificial false roof is constructed, the first mining layer field along the vein horizontal tunnel is excavated from the through-vein tunnel to serve the recovery of the layered ore body. The field along the vein horizontal tunnel runs through the adjacent sub-field inclined tunnel to form a complete first mining layer ventilation and filling system. After the recovery of the first mining layer, all cementing filling is used. After the filling is completed, the field along the vein horizontal tunnel is topped and bottomed to form the first mining layer field inclined tunnel. The inclined tunnel is controlled at a slope of 20% to create mining conditions for the next layer recovery. When the inclined tunnel in the first mining layer is formed, the inclined tunnel is excavated in layers to cut the horizontal tunnel and connect the inclined tunnel in the adjacent sub-area to create conditions for the mining and ventilation of the layer. When the inclined tunnel is excavated in the mining site, the roof of the inclined tunnel needs to be supported to ensure the safety of personnel and equipment.

[0043] (3) Mining: For multi-layer ore bodies, the thickness of the first layer is less than 4m, and the thickness of the second layer is 4-7m. The specific mining plan is as follows: The first layer of ore body adopts the approach type mining, that is, the excavation process of the horizontal tunnel along the vein and the layered cutting tunnel in the field is the mining process of this layer of ore body. The first mining layer is based on the horizontal thickness of the ore body. The horizontal tunnel along the vein in the field is excavated, and the inclined tunnel in the adjacent sub-field is connected. The ore body is mined when the complete ventilation and filling system of the first mining layer is constructed. After the mining and filling of the first mining layer is completed, the remaining layers are excavated by the inclined tunnel in the field, and the layered cutting tunnel is connected to the inclined tunnel in the adjacent sub-field to form a complete ventilation and filling system for the layer. The excavation process of the layered cutting tunnel is the mining process of the ore body. During the mining process, a drilling rig is used to drill horizontal blastholes with a diameter of 38mm, a depth of 2.2m, and a spacing of 1.2m between blastholes. The mining method for the second layer of ore body is to excavate the horizontal lane along the vein in the first mining layer to connect the inclined lane in the adjacent sub-division field, forming a complete filling and ventilation system for the first mining layer, and providing a free face and rock drilling space for the first mining layer. After the excavation of the horizontal lane along the vein in the field is completed, the horizontal lane along the vein in the field is expanded and topped to complete the mining of the layer. After the mining and filling of the first mining layer are completed, the remaining layers are excavated by the inclined lane in the field to cut the horizontal lane in the layer to connect the inclined lane in the adjacent sub-division field, forming a complete ventilation and filling system for the layer, and then the layer cutting horizontal lane is used as the free face and rock drilling space for expansion and top brushing to complete the mining of the layered ore body. During the mining process, a drilling rig is used to drill horizontal blastholes with a diameter of 40mm, a depth of 2m, and a spacing of 1.3m. The specific route of mining site ventilation is as follows: during the mining process, fresh air flows from the through-vein tunnel into the inclined tunnel within the site and then into the mining site; after washing the mining site, the air flows through the inclined tunnels within the adjacent sub-site, the through-vein tunnel, and the segmented veins into the return air system.

[0044] (4) Filling: After the first mining layer is mined, all cemented filling is adopted. In order to serve the next stage of ore body mining, an artificial false roof needs to be constructed in the next layer of the first mining layer. The construction method of the artificial false roof is: laying steel mesh, longitudinal reinforcement φ18 round steel, steel spacing 200mm×200mm, transverse reinforcement φ12 round steel, steel spacing 300mm×300mm; the steel mesh is arranged in a single row, the distance between the steel mesh and the tunnel wall is greater than 50mm, and the thickness of the steel protection layer is less than 50mm. The top height of the remaining layers is controlled to be 5~6m. After the mining is completed, filling is carried out. During the filling process, an inclined tunnel is constructed in each layer. The method of combining waste rock dam and filling body is used to construct the mining inclined tunnel in the field. The slope of the waste rock dam is controlled to be 20% and the height is 5m. The bottom layer is filled with non-cemented filling, the filling height is 4.5m, and the remaining 0.5m is filled with cemented filling. The compressive strength of the surface layer reaches 1.3MPa. After filling, C15 concrete is used to pour 0.1m as the inclined road surface to meet the equipment operation requirements and the temporary pipeline laying requirements during the filling process, while also controlling the depletion rate.

[0045] In this embodiment, the mining kiloton cutting ratio is 5.2m / kt, the loss rate is 6%, and the dilution rate is about 10%.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A mining method suitable for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies, characterized in that: The steps include: (1) Zoning: The vein is divided into stages, the stages are divided into sections, the sections are divided into zones along the strike, and the zones are divided into layers upwards, with a layer height of 5 to 6 m; (2) Mining and cutting project layout: The first layer of ore body is excavated from the lower plate of the first layer of ore body to the stage of vein transportation tunnel, and the vein-crossing tunnel is excavated from the stage of vein transportation tunnel to penetrate the multi-layer ore body; then, the stage of vein transportation tunnel is excavated downhill to the mining field connecting road to mine the lower layer of the first mining layer. After the mining is completed, an artificial false roof is constructed to serve the mining of the next stage of ore body; after the artificial false roof is constructed, the vein-crossing tunnel is excavated to the first mining layer field along the vein horizontal tunnel to serve the mining of the layer of ore body, and the field along the vein horizontal tunnel penetrates the adjacent layers. The inclined tunnels in the area are used to form a complete ventilation and filling system for the first mining layer. After the first mining layer is mined, all cement filling is used. After the filling is completed, the inclined tunnels in the first mining layer are formed by picking the top and filling the bottom along the vein in the field, creating mining conditions for the next layer. After the first mining layer is formed, the inclined tunnels in the field are excavated and cut into layers through the inclined tunnels in the adjacent sub-fields, creating conditions for the mining and ventilation of the layer. When the inclined tunnels in the field are excavated, the roof of the inclined tunnels is supported. (3) Mining: For ore bodies with a thickness of less than 4 m, the mining plan includes the following steps: the first mining layer is based on the horizontal thickness of the ore body, and the horizontal tunnels along the vein are excavated in the field, and the inclined tunnels in the adjacent sub-fields are connected. When the complete ventilation and filling system of the first mining layer is constructed, the ore body is mined. After the mining of the first mining layer is completed, the remaining layers are mined by excavating the inclined tunnels in the field and cutting the horizontal tunnels in the layers, and the inclined tunnels in the adjacent sub-fields are connected to form a complete ventilation and filling system for the layer. The specifications of the layer cutting horizontal tunnels are determined by the horizontal thickness of the ore body in the layer; For the ore body thickness of 4-7m, the mining plan includes the following steps: in the first mining layer, the horizontal tunnel along the vein is driven into the field to connect the inclined tunnel in the adjacent sub-field to form a complete filling and ventilation system for the first mining layer, and the horizontal tunnel along the vein in the field is used as the rock drilling space and free surface to use horizontal blast holes to blast the ore; after the first mining layer is mined, the remaining layers are mined by driving the layered cutting horizontal tunnel in the field inclined tunnel to connect the inclined tunnel in the adjacent sub-field to form a complete ventilation and filling system for the layer; the layered cutting horizontal tunnel is used as the free surface and rock drilling space to expand the wall of the layer; (4) Filling: After the first mining layer is mined, all cemented filling is adopted. In order to serve the next stage of ore body mining, an artificial false roof needs to be built in the next layer of the first mining layer. The top height of the remaining layers is controlled to be 5-6m. Filling is carried out after the mining is completed. During the filling process, an inclined tunnel is constructed in each layer. The inclined tunnel is constructed in the field by combining waste rock dam and filling body. The slope of the waste rock dam is controlled at 15%-20% and the height is 4m. Non-cemented filling is used for the bottom layer with a filling height of 3.5m. The remaining 0.5m is filled with cemented filling. The compressive strength of the surface layer reaches 1.2-1.5MPa. After the filling is completed, C15 concrete is poured for 0.1m as the inclined tunnel road surface.

2. The mining method for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies as described in claim 1 is characterized in that: In the step (2), the slope of the inclined tunnel in the mining layer field is controlled at 15% to 20%.

3. The mining method for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies as claimed in claim 1 is characterized in that: In step (3), the specific route of the mine ventilation is as follows: during the mining process, fresh air flows from the vein-penetrating tunnel into the inclined tunnel within the mine and then into the mine; after washing the mine, the air flows through the adjacent sub-area inclined tunnels, vein-penetrating tunnels, and segmented veins into the return air system.

4. The mining method for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies as claimed in claim 1, characterized in that: In the step (3), during the mining process, a drilling rig is used to drill horizontal blastholes, the blasthole diameter is 38-42 mm, the blasthole depth is 2-2.2 m, and the blasthole spacing is 1.2-1.5 m.

5. The mining method for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies as claimed in claim 1, characterized in that: In the step (4), the artificial false ceiling is constructed by laying a steel mesh, with longitudinal reinforcement of φ18 round steel and a steel bar spacing of 200mm x 200mm, and transverse reinforcement of φ12 round steel and a steel bar spacing of 300mm x 300mm; the steel mesh is arranged in a single row, the distance between the steel mesh and the tunnel wall is greater than 50mm, and the thickness of the steel bar protective layer is less than 50mm.

6. The mining method for mechanized upward layered filling of multi-layer steeply inclined thin ore bodies as claimed in claim 1, characterized in that: In the step (1), the zone is divided into the area between two adjacent inclined tunnels in the field, and the length is the horizontal distance between the two adjacent inclined tunnels in the field, which is 100-150m.

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