Underground filling structure and filling construction method for precious metal mines

Abstract

The present invention discloses a filling structure and a filling construction method for underground noble metal mines, which relates to the technical field of underground mine mining. The present invention includes a filling drift and an adjacent construction drift. A closed bulkhead is provided at the starting end of the filling drift. A roof slab is installed at the top of the closed bulkhead. A filling pipeline is hung under the roof slab. An explosion-proof protective layer is provided on one side of the filling drift close to the adjacent construction drift. A conical waste rock pile is stacked inside the filling drift, and a bottom water drainage channel is formed inside the conical waste rock pile. The present invention can achieve rapid water filtration of the filling slurry and retain the gelling material to avoid loss during the dehydration process of the slurry. The filling body is protected by the explosion-proof protective layer to avoid surface pulverization and blasting damage caused by carbonization, maintain the integrity of the filling body, improve the safety of the mining operation, and more importantly, significantly reduce the loss and dilution of noble metal ores.

Description

Technical Field

[0001] The invention relates to the technical field of underground mining, and in particular to an underground filling structure and a filling construction method of a precious metal mine. Background Art

[0002] In modern mining, especially in the mining process of precious metal mines, in order to improve resource recovery rate, ensure the safety and environmental friendliness of mines, underground filling technology has gradually become one of the indispensable technologies in mining engineering. By filling the mine cavity, underground filling technology can not only effectively improve the stability of the ore body and reduce the risk of mine collapse, but also reduce the storage of waste and environmental pollution. Especially in the mining process of precious metal mines, due to the complexity of the ore body and the large changes in ore grade, underground filling technology plays an important role in improving mine production efficiency and extending the life cycle of mines.

[0003] The mining process of precious metal mines such as gold produces a large amount of waste rock and ore dressing tailings. The waste rock is mainly formed during the construction process of underground development and mining and approval engineering. The tailings are mainly solid waste formed during the ore dressing process, and are usually backfilled into the underground goaf as aggregate. The disposal of underground waste rock and ore dressing tailings is an important issue that restricts the high quality and sustainable development of mines. The discharge of tailings into tailings ponds not only occupies the surface area but also poses a huge safety hazard to the surrounding surface. Lifting the waste rock to the surface increases the lifting cost. An economical and effective method is to fill the underground waste rock and ore dressing tailings into the underground goaf as filling aggregates, which is widely used by underground mines. In addition, for the mining of precious metal mines, due to the high economic properties of the ore, shallow hole blasting and selective approach are usually adopted. However, when the side wall of the recovery approach is the filling body, the exposed surface of the filling body is affected by carbonization to form a loose layer on the surface, which causes the loss and depletion of precious metal ore after mixing with the ore.

[0004] The Chinese patent with the authorization announcement number CN221823869U discloses a filling structure and filling equipment for the access road in the goaf of an underground mine, including: a filling layer, a hanger, a mesh and a water filter pipe. The filling layer includes a first filling layer and a second filling layer, the first filling layer is used to fill the bottom of the access road, and the second filling layer is used to fill the space between the first filling layer and the top of the access road. The hanger is arranged in the filling layer, and the hanger extends along the height direction of the access road. The mesh is arranged in the filling layer, the mesh is laid flat, and the mesh is tied to the hanger. The water filter pipe is arranged in the filling layer, and one end of the water filter pipe is arranged outside the filling layer. This prior art uses hangers to increase the filling strength of the access road, which makes underground construction difficult, and the outer surface does not have an explosion-proof effect. During mining, it is affected by the blasting force, resulting in the exposed side of the filling body being damaged and falling off. Summary of the invention

[0005] The object of the present invention is: to solve the above problems, the present invention provides a filling structure and a filling construction method for underground noble metal mines.

[0006] The present invention specifically adopts the following technical solutions to achieve the above object:

[0007] The filling structure for underground noble metal mines includes a filling drift and an adjacent construction drift. A closed bulkhead is provided at the starting end of the filling drift. A roof is installed at the top of the closed bulkhead. A filling pipeline is hung at the bottom of the roof. The outlet of the filling pipeline is higher than the road surface of the filling drift. An explosion-proof protection layer is provided on one side of the filling drift close to the adjacent construction drift. A conical waste rock pile is stacked inside the filling drift, and a bottom drainage channel is formed inside the conical waste rock pile.

[0008] Further, the explosion-proof protection layer is formed by cross-stitching an inner layer of geotextile and an outer layer of polypropylene woven bags.

[0009] Further, the geotextile is a filament needle-punched non-woven fabric, which is permeable and does not allow solid particles below 10 μm to pass through, and has a thickness of 5 - 10 cm.

[0010] Further, the polypropylene woven bags are mixed with a flame retardant and are permeable.

[0011] Further, the bottom of the explosion-proof protection layer extends horizontally into the filling drift by a distance greater than 30 cm, and the top extends horizontally into the filling drift by a distance greater than 50 cm.

[0012] Further, a bulkhead auxiliary support is provided on the outside of the closed bulkhead.

[0013] Further, the height of the conical waste rock pile is less than 1 m, the size of the waste rock blocks does not exceed 20 cm, and the formed triangular pyramid extends outwards to the side wall of the filling drift at most.

[0014] Further, a guide groove is provided at the bottom of the roof. The guide groove is designed in a broken line. A deceleration part is provided at the part of the guide groove close to the middle of the filling drift. The distance between the deceleration parts is less than the distance between the guide grooves. A support part is provided on the outside of the roof. A pipe hole is provided inside the support part. The filling pipeline passes through the pipe hole. The filling pipeline adopts a flexible pipeline. A support groove is provided at the top of the closed bulkhead. The support part is hermetically inserted into the support groove. An installation ring is fixedly installed on the outside of the filling pipeline. A hanging part is fixedly installed at the bottom of the installation ring. The hanging part is slidably connected in the guide groove. A guiding part is provided between the hanging part and the installation ring. Arc-shaped elastic pieces are provided on both sides of the guiding part. A pulling rope is fixedly connected to the side of the installation ring away from the support part. A rope hole is provided at the top of the roof. The pulling rope passes through the rope hole. An elastic telescopic part is provided at the middle position of the pulling rope. The elastic telescopic part is composed of an outer woven corrugated layer and an inner reset elastic rope.

[0015] Underground filling construction method for precious metal mines, comprising the following steps:

[0016] S1. After all the ore in the drift has been mined, an empty area to be filled in the drift is formed. The underground waste rock is sent into the empty area to be filled by a load-haul-dump (LHD) vehicle and piled up in the middle of the drift to be filled to form a conical waste rock pile, and a bottom drainage channel is formed inside it to facilitate the rapid drainage of the tailings filling slurry.

[0017] S2. A flexible composite structure explosion-proof protective layer is arranged closely against the ore wall of the filling drift. The bottom of the unfolded explosion-proof protective layer is pressed under the conical waste rock pile, and the top is fixed on the roof of the empty area of the filling drift. The filling pipeline for the tailings filling slurry is hung under the lower surface of the roof, and a closed bulkhead is erected at the starting end of the filling drift.

[0018] S3. After the preparatory work is completed, the filling station is notified to start transporting the tailings filling slurry. The tailings filling slurry prepared on the surface is transported to the underground empty area to be filled. The tailings filling slurry continuously infiltrates and fills the voids of the waste rock pile and covers the waste rock pile until the entire drift empty area is filled. After hardening for a certain period of time, the inner geotextile of the explosion-proof protective layer adheres to the filling body to form an integral body.

[0019] S4. When the adjacent construction drift is mined, as the drift continuously advances forward, the protected filling body together with the explosion-proof protective layer is continuously exposed. The explosion-proof protective layer can effectively slow down the blasting force and avoid surface pulverization caused by exposure and carbonization.

[0020] Furthermore, the tailings filling slurry is composed of solid-phase tailings, solid-phase cementitious materials and liquid-phase water, and is a relatively homogeneous slurry formed by stirring and mixing in the filling preparation station. The solid-phase cementitious materials are made by mixing slag powder, desulfurized gypsum powder, lime powder and additives.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The present invention can realize the rapid water filtration of the filling slurry and retain the cementitious materials to avoid loss during the slurry dehydration process. The filling body is protected by the explosion-proof protective layer to avoid surface pulverization and blasting damage caused by carbonization, maintaining the integrity of the filling body, improving the safety of mining operations, and more importantly, significantly reducing the loss and dilution of precious metal ores. At the same time, the mine waste rock and tailings solid waste are disposed of on a large scale and utilized resourcefully, having important safety, economic and environmental benefits.

[0023] 2. The present invention opens a guide groove on the lower surface of the roof, enabling the filling pipeline to move in a zigzag shape under the roof, uniformly grouting the inside of the filling drift. Then, through the setting of the deceleration part, the filling pipeline moves slower in the middle position, allowing the slurry to stay in the conical waste rock pile for a longer time, enabling the slurry to fully flow into the crushed stone pile and the grouting to be uniform. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the filling construction of the present invention;

[0025] Figure 2 It is a schematic diagram of the filling drift construction of the present invention;

[0026] Figure 3 It is a schematic diagram of the anti-explosion protective layer structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the roof installation structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the roof and the filling pipeline of the present invention;

[0029] Figure 6 It is a schematic diagram of the partial structure of the filling pipeline of the present invention;

[0030] Figure 7 It is a schematic diagram of the hanging part structure of the present invention.

[0031] Reference numerals: 1, conical waste rock pile; 2, bottom water drainage channel; 3, anti-explosion protective layer; 4, filling pipeline; 41, installation ring; 42, hanging part; 43, guiding part; 44, arc-shaped elastic piece; 45, pulling rope; 46, elastic telescopic part; 5, roof; 51, guiding groove; 52, decelerating part; 53, supporting part; 61, closed plate wall; 62, auxiliary support of the plate wall; 7, adjacent construction drift; 8, geotextile; 9, polypropylene woven bag. Detailed implementation manners

[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 with reference to the accompanying drawings in the embodiments of the present invention.

[0033] As Figures 1-7 shown, the underground filling structure of a precious metal mine includes a filling drift and an adjacent construction drift 7. A closed plate wall 61 is provided at the starting end of the filling drift. A roof 5 is installed at the top of the closed plate wall 61. A filling pipeline 4 is hung under the roof 5. The outlet of the filling pipeline 4 is higher than the road surface of the filling drift. An anti-explosion protective layer 3 is provided on one side of the filling drift close to the adjacent construction drift 7. A conical waste rock pile 1 is stacked inside the filling drift, and a bottom water drainage channel 2 is formed inside the conical waste rock pile 1.

[0034] The present invention can not only fully consume the waste rock and beneficiation tailings underground in a precious metal mine, but also effectively reduce the loss and dilution of precious metal ores, and has important safety, economic and environmental benefits.

[0035] On the basis of the above embodiment, it further includes that the anti-explosion protective layer 3 is formed by cross-stitching an inner layer of geotextile 8 and an outer layer of polypropylene woven bag 9.

[0036] The geotextile 8 has good strength and toughness, and can provide a certain bearing capacity and tensile resistance. As the inner layer material, it can provide basic support to prevent the inner materials from loosening or breaking. The polypropylene woven bag 9 has the characteristics of tensile resistance and tear resistance. As the outer layer material, it can enhance the stability of the overall structure and the explosion protection capability. The cross-stitching method combines the inner and outer layers more closely, which can effectively disperse the external pressure and explosion impact force, and avoid the outer layer material from falling off or shifting.

[0037] In the explosion-proof design, the combination of the inner and outer layers can effectively mitigate the shock waves and pressure generated by the explosion. The strength of the geotextile 8 and the tear resistance of the polypropylene woven bag 9 are combined to improve the explosion resistance of the protective layer and reduce the damage to the surrounding environment or personnel caused by the fragments and impact generated by the explosion. The outer layer structure of the polypropylene woven bag 9 has a certain elasticity and can absorb part of the impact force, while the geotextile 8 as the inner layer can resist the explosion pressure, thereby improving the overall explosion-proof effect.

[0038] On the basis of the above embodiment, the geotextile 8 is a filament needle-punched non-woven fabric, which is water-permeable but does not penetrate solid particles below 10 μm, and has a thickness of 5-10 cm.

[0039] Filament needle-punched nonwoven fabrics have excellent water permeability, allowing water to pass freely while effectively avoiding water accumulation or seepage problems. For applications that require drainage or soil stabilization (such as foundation pits, drainage systems, etc.), water permeability is a key feature that helps maintain the stability of the structure and avoid the pressure caused by water accumulation. This geotextile can effectively prevent solid particles below 10μm from passing through, which is very important for underground mining engineering applications. Preventing fine particles from entering the system can maintain the stability of the soil or materials, and avoid particles clogging the drainage system or causing structural failure; filament needle-punched nonwoven fabrics can make the fibers tightly connected through the needle-punching process, giving the geotextile higher tensile strength and wear resistance, which means that the geotextile is stronger when subjected to external forces, not easy to break, and can be used stably for a long time.

[0040] Furthermore, the outer polypropylene woven bag 9 is mixed with flame retardant and is water-permeable and has high temperature resistant and flame retardant properties.

[0041] On the basis of the above embodiment, the anti-explosion protection layer 3 may further include: the bottom of the anti-explosion protection layer 3 may extend horizontally into the filling passage by more than 30 cm, and the top of the anti-explosion protection layer 3 may extend horizontally into the filling passage by more than 50 cm.

[0042] Through the extended design, it can effectively prevent the explosion wave from bypassing the edge of the blast-resistant protective layer 3 and directly acting on the targets within the protected area, especially in the edge area or parts vulnerable to the explosion wave. The extended filling area can block and disperse the explosion energy bypassing the edge, ensuring comprehensive protection.

[0043] Based on the above embodiments, it further includes that a wall accessory support 62 is arranged outside the closed plate wall 61 to increase the support strength of the closed plate wall 61.

[0044] Furthermore, the height of the conical waste rock pile 1 is less than 1 m, and the particle size of the waste rock does not exceed 20 cm. The formed triangular pyramid extends outwards to the side wall of the filling drift at most, with good piling effect and facilitating subsequent slurry filling.

[0045] Based on the above embodiments, it further includes that a guide groove 51 is opened at the bottom of the roof 5. The guide groove 51 is designed in a broken line. A deceleration part 52 is arranged at the part of the guide groove 51 close to the middle of the filling drift. The spacing of the deceleration part 52 is less than the spacing of the guide groove 51. A support part 53 is arranged outside the roof 5. A pipe hole is opened inside the support part 53. The filling pipeline 4 passes through the pipe hole. The filling pipeline 4 adopts a flexible pipeline. A support groove is opened at the top of the closed plate wall 61. The support part 53 is hermetically inserted into the support groove. An installation ring 41 is fixedly installed on the outer side of the filling pipeline 4. A hanging part 42 is fixedly installed at the bottom of the installation ring 41. The hanging part 42 is slidably connected in the guide groove 51. A guiding part 43 is arranged between the hanging part 42 and the installation ring 41. Arc-shaped elastic pieces 44 are arranged on both sides of the guiding part 43. A pull rope 45 is fixedly connected to the side of the installation ring 41 away from the support part 53. A rope hole is opened at the top of the roof 5. The pull rope 45 passes through the rope hole. An elastic telescopic part 46 is arranged at the middle position of the pull rope 45. The elastic telescopic part 46 is composed of an outer woven corrugated layer and an inner reset elastic rope.

[0046] Since the length of the filling drift is relatively long, the fixed grouting of the filling pipeline 4 is not only uneven, but also requires a long slurry filling time, and it is difficult for manual assistance to enter underground in the mine. Therefore, through the setting of this embodiment, during slurry filling, first pull the pull rope 45. The pull rope 45 drives the outlet of the filling pipeline 4 to move through the installation ring 41. Under the guiding action of the hanging part 42 and the guide groove 51, the movement track of the outlet of the filling pipeline 4 is in a broken line, so that the outlet of the filling pipeline 4 can sweep to each corner of the filling drift until it is ensured that the filling is uniform. When the outlet of the filling pipeline 4 moves to the end of the filling drift, pull the filling pipeline 4 in the reverse direction. Therefore, by repeatedly pulling the pull rope 45 and the filling pipeline 4, the slurry can be filled in the filling drift in a layered and uniform manner, and the filling is uniform.

[0047] Meanwhile, since a conical waste rock pile 1 is stacked in the middle of the filling drift, more slurry is required in the middle position, and the slurry needs to stay for a long time to fully fill the conical waste rock pile 1. Therefore, through the setting of the deceleration part 52, when the hanging part 42 moves to the deceleration part 52, the arc-shaped elastic piece 44 on the guiding part 43 is squeezed by the deceleration part 52, and the friction force between the two increases. At this time, the friction force is greater than the elastic force of the elastic telescopic part 46, and the elastic telescopic part 46 is stretched. At this time, the outlet of the filling pipeline 4 pauses directly above the conical waste rock pile 1. After the elastic telescopic part 46 is completely stretched, the guiding part 43 is pulled out of the deceleration part 52, and the arc-shaped elastic piece 44 is restored. Under the action of the elastic force of the elastic telescopic part 46, the hanging part 42 will quickly slide in the guide groove 51 to the side wall of the filling drift close to it, and the outlet of the filling pipeline 4 quickly sweeps. Less slurry is required at the edge, and the slurry is evenly swept in, so it can ensure that each layer of slurry can be fully filled into the conical waste rock pile 1.

[0048] Therefore, with the setting of this embodiment, a simple structure can be applied to the slurry filling in the underground filling drift of precious metal mines, with high slurry filling efficiency and uniform slurry filling.

[0049] The underground filling construction method for precious metal mines includes the following steps:

[0050] S1. After all the ore in the drift is mined, a void area to be filled is formed in the drift. The underground waste rock is sent into the void area to be filled by a load-haul-dump truck and stacked in the middle of the drift to be filled to form a conical waste rock pile 1, and a bottom drainage channel 2 is formed inside it to facilitate the rapid drainage of the tailings filling slurry.

[0051] S2. A flexible composite structure anti-explosion protection layer 3 is arranged close to the ore side wall of the filling drift. The bottom of the unfolded anti-explosion protection layer 3 is pressed under the conical waste rock pile 1, and the top is fixed on the roof 5 of the void area to be filled in the drift. The tailings filling slurry filling pipeline 4 is hung under the lower surface of the roof 5, and a closed bulkhead 61 is erected at the starting end of the filling drift.

[0052] S3. After the preparation work is completed, notify the filling station to start transporting the tailings filling slurry, and transport the tailings filling slurry prepared on the surface to the underground void area to be filled. The tailings filling slurry continuously seeps into and fills the voids of the waste rock pile, and covers the waste rock pile until the entire drift void area is filled. After hardening for a certain period of time, the inner geotextile 8 of the anti-explosion protection layer 3 adheres to the filling body to form an integral body.

[0053] S4. When the adjacent construction drift 7 is mined, as the drift continuously advances forward, the protected filling body together with the anti-explosion protection layer 3 is continuously exposed. The anti-explosion protection layer 3 can effectively reduce the blasting force and avoid surface pulverization caused by exposure and carbonization.

[0054] On the basis of the above embodiments, it further includes that the tailings filling slurry is composed of solid-phase tailings, solid-phase cementitious materials and liquid-phase water, and is a relatively homogeneous slurry formed by stirring and mixing at the filling preparation station. The solid-phase cementitious materials are made by mixing slag powder, desulfurized gypsum powder, lime powder and additives. The slump of the tailings filling slurry is not less than 25 cm, and the specific surface area of the slag powder is not less than 450 m 2 / kg.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An underground filling structure for a precious metal mine, comprising a filling approach and an adjacent construction approach (7), characterized in that: A closed plate wall (61) is provided at the starting end of the filling access road, a top plate (5) is installed on the top of the closed plate wall (61), a filling pipeline (4) is suspended at the bottom of the top plate (5), the outlet of the filling pipeline (4) is higher than the filling access road surface, an anti-explosion protection layer (3) is provided on the side of the filling access road close to the adjacent construction access road (7), a conical waste rock pile (1) is piled inside the filling access road, and a bottom drainage channel (2) is formed inside the conical waste rock pile (1); A guide groove (51) is provided at the bottom of the top plate (5), and the guide groove (51) is designed as a broken line. A deceleration portion (52) is provided at a portion of the guide groove (51) close to the middle of the filling inlet, and the spacing of the deceleration portion (52) is smaller than the spacing of the guide groove (51). A support portion (53) is provided on the outside of the top plate (5), and a pipe hole is provided inside the support portion (53), and the filling pipeline (4) passes through the pipe hole. The filling pipeline (4) adopts a flexible pipeline. A support groove is provided on the top of the closed plate wall (61), and the support portion (53) is sealed and plugged into the support groove. A mounting ring (41) is fixedly installed on the outside of the filling pipeline (4). A hanging member (42) is fixedly mounted on the bottom of the mounting ring (41), and the hanging member (42) is slidably connected in the guide groove (51). A guide member (43) is provided between the hanging member (42) and the mounting ring (41), and arc-shaped spring sheets (44) are provided on both sides of the guide member (43). A pull rope (45) is fixedly connected to the side of the mounting ring (41) away from the support portion (53). A rope hole is provided at the top of the top plate (5), and the pull rope (45) passes through the rope hole. An elastic telescopic portion (46) is provided in the middle of the pull rope (45), and the elastic telescopic portion (46) is composed of an outer braided corrugated layer and an inner reset elastic rope.

2. The underground filling structure of a precious metal mine according to claim 1 is characterized in that: The explosion-proof protective layer (3) is formed by cross-stitching an inner geotextile (8) and an outer polypropylene woven bag (9).

3. The underground filling structure of a precious metal mine according to claim 2 is characterized in that: The geotextile (8) is a filament needle-punched non-woven fabric that is water-permeable but impermeable to solid particles below 10 μm, and has a thickness of 5-10 cm.

4. The underground filling structure of a precious metal mine according to claim 3 is characterized in that: The polypropylene woven bag (9) is mixed with a flame retardant and is water-permeable.

5. The underground filling structure of a precious metal mine according to claim 4, characterized in that: The bottom of the explosion-proof protective layer (3) extends horizontally into the filling passage for a distance greater than 30 cm, and the top extends horizontally into the filling passage for a distance greater than 50 cm.

6. The underground filling structure of a precious metal mine according to claim 5, characterized in that: A board wall auxiliary support (62) is provided on the outer side of the closed board wall (61).

7. The underground filling structure of a precious metal mine according to claim 6, characterized in that: The cone-shaped waste rock pile (1) has a height of less than 1 m, a waste rock block size of no more than 20 cm, and the formed triangular cone extends outwards to the maximum extent of the side wall of the filling entrance road.

8. A method for underground filling construction in a precious metal mine, using the underground filling structure of a precious metal mine as described in any one of claims 1 to 7, characterized in that: The following steps are involved: S1. After all the ore in the access road is mined, an empty area of ​​the access road to be filled is formed. The scraper transports the underground waste rock into the empty area of ​​the access road to be filled and piles it in the middle of the access road to be filled to form a conical waste rock pile (1). A bottom drainage channel (2) is formed inside the waste rock pile to facilitate rapid drainage of the tailings filling slurry. S2, a flexible composite structure explosion-proof protective layer (3) is arranged close to the mine wall of the filling access road, the bottom of the unfolded explosion-proof protective layer (3) is pressed under the conical waste rock pile (1), and the top is fixed on the top plate (5) of the empty area of ​​the filling access road, the tailings filling slurry filling pipeline (4) is hung on the lower surface of the top plate (5), and a closed plate wall (61) is erected at the starting end of the filling access road; S3. After the preparation work is completed, the filling station is notified to start conveying the tailings filling slurry, and the tailings filling slurry prepared on the surface is conveyed to the empty area to be filled underground. The tailings filling slurry continuously infiltrates and fills the gaps in the waste rock pile, and covers the waste rock pile until it fills the entire empty area of ​​the access road. After a certain period of hardening, the inner layer of the anti-blast protective layer (3) is adhered to the filling body to form a whole; S4. When mining the adjacent construction access road (7), as the access road continues to advance, the protected filling body together with the anti-explosion protection layer (3) is continuously exposed. The anti-explosion protection layer (3) can effectively mitigate the blasting force and avoid surface powdering caused by exposure carbonization.

9. The underground filling construction method of a precious metal mine according to claim 8, characterized in that: The tailings filling slurry comprises solid tailings, solid-phase cementitious materials and liquid-phase water, and is a relatively homogeneous slurry formed by stirring and mixing at a filling preparation station. The solid-phase cementitious materials are made by mixing slag powder, desulfurized gypsum powder, lime powder and admixtures.

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