Mining method for upper-layer and lower-layer gently-inclined medium-thickness ore body

Abstract

The invention discloses a mining method for an upper-layer and lower-layer gently-inclined medium-thickness ore body. The mining method comprises the following steps that S1, a stope is arranged, and constituent elements are arranged; s2, mining preparation cutting; s3, drilling and blasting; s4, stoping is carried out; s5, ore removal from a stope; and S6, filling. After the method is implemented in a mining area, the production capacity of the panel can reach 250t / d; the dilution rate is 10.63%; the mining and cutting ratio of thousand tons is 13.24 m / Kt; the by-product ore ratio is 18.14%; the cut waste rock ratio is 2.81%, and particularly, the byproduct ore ratio and the cut waste rock ratio are obviously reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of underground metal mining, and in particular to a mining method for gently inclined medium-thick ore bodies with upper and lower layers. Background Art

[0002] Due to the complex and diverse structures of deep ore bodies, traditional single mining processes cannot meet the various requirements of mine production. For gently inclined medium-thick ore bodies with waste rock interlayers between the upper and lower layers in underground metal mines, the traditional mining process is to arrange the development and cutting engineering layout form, which generally adopts a two-stage structure, that is, the upper section is the drilling level (layer), and the lower section is composed of the stope bottom structure, resulting in the simultaneous extraction of the intermediate intercalated rock and the upper and lower layer ores, causing a large amount of waste rock to be mixed into the sampling material, increasing the waste rock disposal workload, a sharp increase in the ore dilution rate, and increasing the mining and beneficiation costs.

[0003] The information disclosed in the background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] The present invention provides a mining method for gently inclined medium-thick ore bodies with upper and lower layers to solve the above technical problems. This method is applicable to the mining of gently inclined medium-thick ore bodies with waste rock interlayers between the upper and lower layers in underground metal mines, can reduce the mixing of waste rock during the mining process, control the ore dilution rate, improve the stability of the development and cutting engineering during the mining process, improve the mining efficiency, and effectively reduce the support cost.

[0005] The present invention provides a mining method for gently inclined medium-thick ore bodies with upper and lower layers, including the following steps:

[0006] Step S1: Stope layout and component elements: Within the height range of this stage, the two-layer ore body is divided into upper and lower mining areas. The stope is arranged along the vertical strike of the ore body. Multiple north-south stopes are arranged along the strike of the ore body in the upper and lower mining areas respectively. Three roadway for drilling raises are arranged in the ore body respectively; during the stope extraction process, regular pillars are left in the lower mining area, and irregular pillars are left in the upper mining area. The ore pillars are regarded as permanent losses and are not extracted.

[0007] S2. Development and Cutting: In this stage, the haulage drift is arranged along the strike of the ore body at the footwall of the ore body, and the stage drift along the vein for loading is set up; a manway ventilation and material shaft is arranged at the position of the boundary pillar on both sides of the ore block to the upper mining area, and then an electric scraper drift is driven along the strike of the ore body to connect the manway ventilation and material shafts at both ends; three stope ore passes are driven equidistantly from the haulage drift of this stage to the level of the electric scraper drift. The stope is arranged with a cutting drift along the strike of the ore body at the position of the ore pass, and a cutting raise is arranged near the boundary pillar of the stope in the cutting drift; the drilling raise roadway is arranged at the position of the ore pass and driven vertically along the strike of the ore body. The floor of the drilling raise in the lower mining area should be below the floor of the ore body; filling and return air raises are driven at the ends of the drilling raise roadways on both sides to the filling and return air top along of the upper stage to form a return air safety passage.

[0008] S3. Drilling and Blasting: Each stope is mined from the first ore pass at the north of the stope along the first drilling raise roadway. Vertical fan-shaped blast holes are arranged along the north, west, and south sides of the point pillar and near the boundary pillar surface; in the stope, a rock drill is used to drill medium-deep holes, and the ore is blasted by staged millisecond blasting.

[0009] S4. Mining: In this stage, the lower ore body is mined first between the upper and lower ore bodies. The mining face is arranged along the strike of the ore body from the ore pass and gradually advances from north to south; the mining sequence is from the return air side to the intake air side. In each mining area, the northern stope is mined first, and after the filling reaches the roof, the southern stope is mined; after the lower ore body is mined, it is filled to the interlayer rock layer, and then the upper mining area is mined.

[0010] S5. Ore Extraction from Stope: After the stope is blasted, the caved ore is raked by an electric scraper winch to the stope ore pass, and the ore is loaded at the bottom of the stope ore pass by a vibrating ore-discharging machine.

[0011] S6. Filling: After the mining of the lower mining area is completed, filling is carried out. Before filling, a filling airtight wall must be arranged at the head of the drilling raise. The section of the ore pass from the floor of the lower ore body to the floor of the upper ore body is maintained by a steel cylinder. The filling pipeline is led from the filling and return air top along of the upper stage, and high-strength cemented tailings are used for filling, which is connected to the goaf through the filling and return air raise; high-strength cemented tailings are used for filling. According to the dewatering situation of the filling body, filling is carried out in sections, and the height of each filling should not be too high; after the lower mining area is filled to the interlayer rock layer, the upper ore body is mined; when mining the upper ore body, it is necessary to determine whether the upper ore body can be mined according to the damage of the surrounding rock of the upper ore body roadway and the ground pressure manifestation. If the ground pressure manifestation is serious, the upper ore body is not mined, and the upper ore body is filled with tailings after mining.

[0012] Preferably, the selected area in "within the height range of this stage, the two-layer ore body is divided into upper and lower mining areas" in step S1 refers to the height range of the lower two levels being 25 - 35 m, the ore body thickness being 4 - 8 m, the dip angle being less than 30°, and the interlayer rock thickness being greater than 3 m.

[0013] Preferably, the total length of the ore body plane ranges from 125 to 140 m, the stope width is 36 m, and the length is 42 m. Each layer of the upper ore body is divided into two upper and lower stopes.

[0014] Preferably, the spacing of the headings for raising is 12 m, with a stope intermediate pillar left in the middle, and the width of the intermediate pillar is 4 m.

[0015] Preferably, the size of the permanent pillar is 4×4 m, and the widths of the top and bottom pillars of the permanent pillar are both 6 m;

[0016] The components also include: a manway ventilation and material shaft, a ore pass, and a lower stope ore pass; the sizes of the manway ventilation and material shaft and the ore pass are both 2×2 m; the height of the lower stope ore pass is 8 - 20 m, and the upper stope ore pass is prefabricated with steel plates; the lower stope ore pass is installed before stope backfilling; the upper and lower stopes are connected by the manway ventilation and material shaft.

[0017] Preferably, in this stage of step S2, the mining method personnel and equipment directly operate in the stope. To ensure the safety of the stoping operation and avoid large - area caving before the end of the ore room stoping,

[0018] Strengthen the roof management. During the stoping process, the roof can be supported by rock bolts according to the stability of the ore body roof. The roof support work uses the muck pile after blasting for rock bolt mesh support. The support width is 6 m, the length of the rock bolt is 1.5 - 1.8 m, and the bolt spacing is 1.5 m×1.5 m.

[0019] Preferably, in step S3, YGZ90 rock drills are used for stope drilling, with a hole diameter of φ65 mm; for blasting, the row spacing of the blast holes is 1.2 - 1.4 m, the hole bottom distance is 2.0 - 2.5 m, the ore breakage per blast hole is 3.9 t / m, the specific charge of ore drawing is 0.49 kg / t, and the qualified block size of the ore is 500 mm; medium - deep hole blasting requires a domestic BQF - 100 type tunneling charging device for charging. The explosive is 2# rock granular ammonium nitrate explosive, and the primer explosive is 2# rock emulsion explosive.

[0020] Preferably, in step S6, the steel cylinder is made of a steel plate with a thickness of 10 mm.

[0021] Preferably, in step S6, the mass ratio of cement to tailings of the high - strength cemented tailings used for backfilling is 1:8 - 10.

[0022] The beneficial effects that the present invention can produce include:

[0023] 1) The mining method for gently inclined medium-thick ore bodies with upper and lower layers provided by the present invention arranges raise boring, crossheading for drilling and undercutting drift along the strike of the two ore bodies respectively, and connects the upper and lower layers through manways and ore passes, avoiding the simultaneous extraction of intercalated rock and ore caused by the previous two-stage development technology, reducing the waste rock mixing rate and ore dilution rate; adopts upward vertical fan-shaped medium-deep hole blasting, electric scraper raking ore to the ore pass, vibrating machine ore drawing and mining truck ore haulage, greatly improving the ore drawing efficiency; the stope production capacity can reach 250 - 300 t / d. An air return top edge is arranged at the upper part of the stage for air return and filling. Immediately after the mining of the lower ore body is completed, tight filling is started to ensure the safety and stability of the mining of the upper ore body; it meets the mining production requirements of "three strengths"; the development engineering layout in the stope is simple and conducive to construction. The development engineering is arranged perpendicular to the strike of the ore body, and the ore and rock produced by these projects can be used as by-product ore, reducing the tunneling cost.

[0024] 2) The mining method for gently inclined medium-thick ore bodies with upper and lower layers provided by the present invention can achieve a panel production capacity of 250 t / d, a dilution rate of 10.63%, a development ratio per 1000 tons of 13.24 m / Kt, a by-product ore ratio of 18.14%, and a development waste rock ratio of 2.81% after being implemented in the mining area. In particular, the by-product ore ratio and the development waste rock ratio are significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the operation principle of the mining method for gently inclined medium-thick ore bodies with upper and lower layers in at least one embodiment provided by the present invention; (III-III plan view);

[0026] Figure 2 is Figure 1 the sectional view taken along the line I-I of

[0027] Figure 3 is Figure 1 the sectional view taken along the line II-II of

[0028] Figure 4 is Figure 1 the sectional view taken along the line IV-IV of

[0029] Figure 5 is Figure 1 the sectional view taken along the line V-V of

[0030] LEGEND DESCRIPTION:

[0031] Stage crosscut haulage roadway 1, manway connecting roadway 2, stope ore pass 3, manway ventilation and material shaft 4, electric scraper connecting roadway 5, undercutting drift 6, raise boring 7, crossheading for drilling 8, filling and air return raise 9, filling and air return top edge 10, electric scraper chamber 11, filling body 12, caved ore 13, ore drawing fan-shaped blast holes 14, filling and airtight retaining wall 15, stope intermediate pillar 16, permanent ore pillar 17. DETAILED DESCRIPTION OF THE INVENTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] The technical means not detailed in the present invention and not used to solve the technical problems of the present invention are set according to the common general knowledge in the art, and various common general knowledge setting methods can be realized.

[0035] See Figures 1-5 , the mining method for gently inclined medium-thick ore bodies with upper and lower layers provided by the present invention includes the following steps:

[0036] Step S1: Stope layout and constituent elements: The height range of the middle sections of the lower two layers is 25 - 35 m, the thickness of the ore body is 4 - 8 m, the dip angle is less than 30°, and the thickness of the intercalated rock is greater than 3 m; the stope is along the vertical strike of the ore body, and three north-south stopes are respectively arranged along the strike of the ore body in the upper and lower mining areas; the total length range of the ore body plane is 125 - 140 m, the stope width is 36 m, and the length is 42 m. Each layer of the upper ore body is divided into upper and lower stopes, and three raise-drilling headings 7 are arranged in each stope, with a stope pillar 16 left in the middle, and the width of the pillar is 4 m. The spacing of the raise-drilling headings 7 is 12 m. During the mining process of each stope, regular or irregular permanent ore pillars 17 with dimensions of 4×4 m and top and bottom pillar widths of 6 m are left in the stope as permanent losses and are not mined. The sizes of the personnel, ventilation, and material shaft and the ore pass are both 2×2 m. The height of the ore pass 3 in the lower stope is 8 - 20 m, and the ore pass 3 in the upper stope is prefabricated with steel plates and installed to connect the ore pass in the lower stope before the stope is backfilled. The upper and lower stopes are connected by a personnel, ventilation, and material shaft 4.

[0037] Step S2, development and cutting: In this stage, the haulage drift is arranged along the strike of the ore body at the footwall of the ore body, and the layout method of loading along the vein is adopted (stage drift along the vein 1). A manway connection drift 2 is arranged between the stage drift along the vein 1 and the manway, ventilation and material shaft 4. The upper slice level is connected to the lower slice level and the current stage level respectively by sectional manway, ventilation and material shafts 4. One manway, ventilation and material shaft 4 is set at each of the pillar positions on both sides of the ore block to the upper mining area, and then an electric scraper connection drift 5 is driven along the strike of the ore body at the head end to connect the manway, ventilation and material shafts 4 at both ends. The electric scraper connection drift 5 is arranged with corresponding electric scraper chambers 11 near the head end. The cutting drift is arranged along the strike of the ore body at the ore pass position at the head end of the ore body as the undercut drift 6, connecting the raise for drilling 7 and the ore pass 3 of the stope. Three ore passes of the stope are driven equidistantly from the undercut drift to the electric scraper connection drift. A cutting raise is arranged near the stope pillar 16 of the undercut drift. The raise for drilling 7 is arranged at the ore pass position, driven vertically along the strike of the ore body, and the floor of the raise for drilling in the lower mining area needs to be below the floor of the ore body. Drilling cross drifts 8 are driven at the ends of the raise for drilling tunnels on both sides to connect the raise for drilling, and a backfill return air raise 9 is constructed at the tail of the raise for drilling to the backfill return air roof edge 10 of the upper stage to form a return air passage and a safety passage.

[0038] It should be noted that in this stage, the personnel and equipment of the mining method directly operate in the stope. To ensure the safety of the stoping operation and avoid large-area caving before the end of the ore room stoping, it is necessary to strengthen the roof management. During the stoping process, the roof can be supported by rock bolts according to the stability of the ore body roof. The roof support work can use the muck pile after blasting for rock bolt mesh support. The support width is 6m, the rock bolt length is 1.5m - 1.8m, and the rock bolt density is 1.5m × 1.5m.

[0039] Step S3, drilling and blasting: Each stope is mined from the first ore pass at the north of the stope along the first raise for drilling tunnel. Vertical caving fan-shaped blast holes 14 are arranged along the north, west and south sides of the point pillar and near the pillar side. The stope uses a rock drill to drill medium-deep holes, and the ore 13 is caved by staged millisecond blasting. The electric scraper connection drift, ore pass and cutting drift at the ore pass position of this stage are used as the free face for the first blasting.

[0040] It should be noted that YGZ90 rock drill is used for drilling in the stope, with a hole diameter of φ65mm; the row spacing of the blast holes selected for blasting is 1.2 - 1.4m, the hole bottom distance is 2.0 - 2.5m, the ore caved per blast hole is 3.9t / m, the specific charge of ore caving is 0.49kg / t, and the qualified block size of the ore is 500mm; medium-deep hole blasting needs to use a domestic BQF-100 type tunneling charging device for charging. The explosive is 2# rock granular ammonium nitrate explosive, and the primer explosive is 2# rock emulsion explosive.

[0041] It should be noted that the fresh air flow in the stope travels from the haulage roadway of this stage along the manway ventilation material shaft upwards to the electric scraper roadway, then enters the ore room through the drilling raise. After washing the mining face, the polluted air ascends from the polluted air at the end face of the stope through the backfill return air shaft to the upper-stage backfill return air roof edge and enters the return air system to return to the surface. After the stope is blasted, in order to discharge the blasting fumes as soon as possible, a local fan can be used for forced ventilation to assist.

[0042] Step S4, stoping: In this stage, the lower ore body is mined first between the upper and lower ore bodies. The stoping face is arranged along the ore body strike from the ore pass and gradually advances from north to south; the stoping sequence is from the return air side to the intake air side. In each mining area, the northern stope is mined first, and after backfilling and reaching the roof, the southern stope is mined; after the lower ore body is mined, it is backfilled and capped to the interlayer rock, and then the upper mining area is mined.

[0043] Step S5, ore drawing from the stope: After the stope is blasted, the caved ore is raked from the drilling raise roadway to the stope ore pass using a 2DPJ-30 type electric scraper winch equipped with a 0.3 m3 scraper bucket, and the ore is loaded at the bottom of the stope ore pass using a vibrating ore feeder.

[0044] Step S6, backfilling: After the stoping of the lower mining area is completed, a backfill airtight wall 15 must be arranged at the head of the drilling raise before backfilling. The section of the ore pass from the bottom plate of the lower ore body to the bottom plate of the upper ore body is maintained using a steel cylinder with a steel plate thickness of 10 mm to prevent backfill materials from entering the ore pass. The backfill pipeline comes from the upper-stage backfill return air roof edge 10 and is connected to the goaf through the backfill return air raise 9. High-strength cemented tailings are used for backfilling, and the mass ratio of cement to sand is 1:8 - 10. According to the dewatering situation of the backfill body 12, backfilling is carried out in sections, and the height of each backfilling should not be too high; after the lower mining area is backfilled and capped to the interlayer rock, the upper ore body is mined. When mining the upper ore body, it is necessary to determine whether the upper ore body can be mined according to the damage situation of the surrounding rock of the upper ore body roadway and the ground pressure manifestation. If the ground pressure manifestation is serious, the upper ore body is not mined. After the upper ore body is mined, tailings are used for backfilling.

[0045] It should be noted that the main economic and technical indicators of the standard ore block of the mining method for the upper and lower gently inclined medium-thick ore bodies are shown in Table 1.

[0046] Table 1

[0047] Serial number Index name Unit Index 1 Panel production capacity t / d 250 2 Loss rate ％ 2565 3 Dilution rate ％ 10.63 4 Mining and development ratio per thousand tons m / Kt 13.24 n / Kt 71.97 5 Ratio of by-product ore ％ 18.14 6 Ratio of waste rock in mining and development ％ 2.81

[0048] After adopting this method, the panel production capacity can be increased to 250 t / d; the dilution rate is effectively controlled at only 10.63%; the thousand-ton cutting ratio is increased to 13.24 m / Kt; the by-product ore ratio is effectively controlled at only 18.14%; the cutting waste rock ratio is effectively controlled at only 2.81%. The stope test shows that the technical indicators achieved by this method in the mining of gently inclined medium-thick ore bodies have reached the expected goals, solved the problems existing in the existing mining methods, and have the value of popularization and application.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for mining a medium-thick ore body with two upper and lower layers of gently inclined ore, characterized in that: The following steps are involved: Step S1: Stope layout and components: Within the height range of this stage, the two-layer ore body is divided into two upper and lower mining areas. The stopes are arranged along the vertical direction of the ore body. Multiple north-south stopes are arranged in the upper and lower mining areas along the direction of the ore body, and three tunnels for rock drilling up the mountain are arranged in the ore body. During the stope recovery process, regular point pillars are left in the lower mining area and irregular point pillars are left in the upper mining area. The pillars are regarded as permanent losses and are not recovered; S2, Mining and cutting: The transport tunnels in this stage are arranged along the ore body in the lower plate, and the stage transport tunnels along the vein are set up by loading vehicles along the vein; a pedestrian ventilation material shaft is set up at the pillars on both sides of the ore block to the upper mining area, and then an electric rake connecting road is excavated along the ore body to connect the pedestrian ventilation material shafts at both ends; three mining field chutes are excavated at equal distances from the transport tunnels in this stage to the level of the electric rake connecting road, and the mining field arranges the cutting tunnels along the ore body at the chute position, and arranges the cutting skylight near the mining field pillar position in the cutting tunnel; the rock drilling uphill tunnel is arranged at the chute position, and the excavation is perpendicular to the ore body. The rock drilling uphill floor of the lower mining area needs to be below the ore body floor; the return air skylight is excavated at the end of the rock drilling uphill tunnels on both sides to the upper stage to fill the return air top edge to form a return air safety channel; S3, rock drilling and blasting: Each stope is mined from the first chute in the north along the first rock drilling tunnel, and vertical fan-shaped blast holes are arranged along the north and southwestern sides of the point column and near the intermediate column surface; the stope uses a rock drill to drill medium-deep holes, and blasts the ore in sections with micro-difference; S4, mining: In this stage, the lower ore body is mined first between the upper and lower ore bodies. The mining working face is arranged from the chute along the ore body direction, and gradually advances from north to south; the mining sequence is from the return air side to the inlet air side. In each mining area, the northern mining area is mined first, and then the southern mining area is mined after filling and connecting the top; after the lower ore body is mined, the top is filled and connected to the interlayer, and then the upper mining area is mined; S5. Mining out of the stope: After the stope is blasted, the collapsed ore is raked to the stope chute by an electric rake winch, and the bottom of the stope chute is loaded with a vibrating ore-discharging machine; S6. Backfilling: Backfilling is carried out after the lower mining area is mined. Before backfilling, a closed backfilling wall must be arranged at the head end of the rock drilling. The chute section from the bottom plate of the lower ore body to the bottom plate of the upper ore body is maintained by steel cylinders. The filling pipe is filled from the upper stage to the top edge of the return air. High-strength glued tailings are used for filling and connected to the goaf through the filling return air shaft. High-strength glued tailings are used for backfilling. Filling is carried out in sections according to the dehydration of the filling body, and the filling height should not be too high each time. The upper ore body can be mined after the lower mining area is filled and connected to the top to the stone. When mining the upper ore body, it is necessary to determine whether the upper ore body can be mined based on the damage of the surrounding rock of the upper ore body tunnel and the ground pressure. If the ground pressure is serious, the upper ore body will not be mined, and tailings will be used for backfilling after the upper ore body is mined.

2. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: In step S1, the area selected in "within the height range of this stage, the two layers of ore bodies are divided into upper and lower mining areas" refers to the middle section of the lower two layers with a height range of 25 to 35m, an ore body thickness of 4 to 8m, a dip angle of less than 30°, and a thickness of interlayered rocks greater than 3m.

3. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: The total length of the ore body plane ranges from 125 to 140m, the stope width is 36m and the length is 42m. Each layer of the ore body is divided into upper and lower stopes.

4. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: The spacing between tunnels for drilling up the mountain is 12m, with mining field pillars in the middle, and the width of the pillars is 4m.

5. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: The size of the permanent pillar is 4×4m, and the width of the top and bottom pillars of the permanent pillars are both 6m; The components also include: pedestrian ventilation material well, chute, and lower mining field chute; the dimensions of the pedestrian ventilation material well and chute are both 2×2m; the height of the lower mining field chute is 8 to 20m, and the upper mining field chute is prefabricated with steel plates; the lower mining field chute is installed and connected before the mining field is filled; the upper and lower mining fields are connected by a pedestrian ventilation material well.

6. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: In this stage of step S2, the mining method personnel and equipment all work directly in the mining site. In order to ensure the safety of the mining operation and avoid large-scale collapse before the end of the mining in the mine room, the roof management is strengthened. During the mining process, the roof can be anchored according to the stability of the ore body roof. The roof protection work uses the blasting pile after blasting to carry out anchor net protection. The roof protection width is 6m, the anchor length is 1.5m~1.8m, and the anchor mesh is 1.5m×1.5m.

7. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: In step S3, the rock drilling in the mining area adopts YGZ90 drilling machine with a hole diameter of φ65mm; the blasthole spacing selected for blasting is 1.2-1.4m, the hole bottom distance is 2.0-2.5m, the ore collapse volume per blasthole is 3.9t / m, the unit consumption of ore-falling explosive is 0.49kg / t, and the qualified ore block size is 500mm; medium-deep hole blasting requires the use of domestic BQF-100 excavation loader for charging, the explosive is 2# rock granular ammonium nitrate explosive, and the detonating explosive is 2# rock emulsion explosive.

8. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1 is characterized in that: In step S6, the steel cylinder is made of a steel plate with a thickness of 10 mm.

9. The method for mining a medium-thick ore body with two upper and lower layers of gently inclined layers according to claim 1, characterized in that: The mass ratio of the high-strength colloid tailing sand used for filling in step S6 is 1:8-10.

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