CN113416840A - Stope seal seepage-blocking method and application thereof, stope seal seepage-blocking structure and application thereof - Google Patents

Abstract

The invention provides a stope closing seepage-blocking method and application thereof, and a stope closing seepage-blocking structure and application thereof, and particularly relates to the technical field of mine underground water pollution prevention and control. According to the mine field closing seepage-proofing method, the position of a horizontal seepage-proofing curtain is determined after mine production is finished, and grouting is carried out after grouting holes are distributed to form the horizontal seepage-proofing curtain; the horizontal impervious curtain is positioned between the bottom of the vegetation growing layer and the top surface of the mineral layer, is mainly formed by solidifying a seepage-resistant material, and the seepage-resistant material comprises 70-80% of cement, 1-10% of bentonite, 2-5% of lime, 0.1-1% of an accelerating agent and the balance of water. The invention provides a mine field closing seepage-resisting structure which comprises a horizontal seepage-resisting curtain. The field sealing seepage-resisting method provided by the invention reduces the leaching effect of rainfall on the mineral leaching layer containing the residual mineral leaching agent, and reduces the generation amount of tail water and the concentration of pollutants in the tail water.

Description

Stope seal seepage-blocking method and application thereof, stope seal seepage-blocking structure and application thereof

Technical Field

The invention relates to the technical field of mine underground water pollution prevention and control, in particular to a mine field closing seepage-resisting method and application and a mine field closing seepage-resisting structure and application.

Background

The ionic rare earth ore (also called weathering crust elution type rare earth ore) in China is mainly distributed in south China, is rich in medium and heavy rare earth elements such as terbium, dysprosium and the like, and is an important strategic resource concerned by the world. The ionic rare earth ore deposit is distributed in the landform area of hills and is formed by the strong efflorescence of volcanic rocks such as granite and the like containing rare earth under the conditions of warm and humid climate and hills, and the ore body is generally rich in completely weathered and semiweathered zones.

At present, the in-situ leaching process is the only allowable mining process of the ionic rare earth ore, if the in-situ leaching process is not carried out in time after the leaching process is finished, the in-situ leaching process is carried out, under the rainfall condition, rainwater permeates into soil to leach a leaching layer containing residual leaching agent, so that residual ammonia nitrogen, sulfate and other substances are taken away and enter a groundwater aquifer, and secondary pollution is caused to groundwater.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The invention aims to provide a mine field closing and seepage-resisting method, which aims to solve the technical problem of secondary pollution caused by rainwater leaching of an ore leaching layer in the prior art.

The second purpose of the invention is to provide a mine field closing seepage-resisting structure, which reduces leaching of residual mineral leaching agent caused by rainfall infiltration and ensures stability of a mountain.

The third purpose of the invention is to provide the mine field closing seepage-resisting method of the first purpose and the application of the mine field closing seepage-resisting structure of the second purpose in the in-situ leaching field closing.

In order to solve the technical problems, the invention adopts the following technical scheme:

the first aspect of the invention provides a mine field closing seepage-proofing method, wherein the position of a horizontal seepage-proofing curtain is determined after mine production is finished, and grouting is carried out after grouting holes are arranged to form the horizontal seepage-proofing curtain;

the position of the horizontal impervious curtain is between the bottom 1m of the vegetation growing layer and the top surface of the mineral seam.

Optionally, the field sealing refers to washing the mine field first, and performing the field sealing after the concentration of the mineral leaching agent in the solution obtained by washing is less than or equal to 100 ppm.

Optionally, the horizontal impervious curtain is formed after the impervious material is solidified.

Preferably, the pressure of the grouting is 0.5-1.0 MPa.

Optionally, the permeation-resistant material comprises, by mass, 70-80% of cement, 1-10% of bentonite, 2-5% of lime, 0.1-1% of an accelerator, and the balance of water.

Optionally, the number of the grouting holes is multiple, the grouting holes are arranged in rows, and the row pitch of the grouting holes is greater than or equal to 0.8m and smaller than or equal to 1.2 m;

and the hole distance between the adjacent grouting holes is more than or equal to 0.8m and less than or equal to 1.2 m.

Optionally, the mine field sealing seepage-blocking method further comprises rainwater drainage.

Optionally, rainwater drainage is conducted by arranging the diversion holes in the hillside and intercepting and draining the flood channels.

The invention provides a second aspect of the invention provides a mine field closing seepage-proofing structure, which comprises a horizontal seepage-proofing curtain;

the horizontal impervious curtain is positioned below the vegetation growth layer and above the top surface of the ore body.

The horizontal impervious curtain is parallel to the slope surface, and the slope surface extends out of one end close to the slope bottom.

Optionally, the device further comprises a drainage guide structure, wherein the drainage guide structure comprises a diversion hole and a flood interception and drainage channel.

The diversion holes are arranged on the slope surface, communicated with the flood intercepting and draining ditches and used for collecting rainwater guided out by the diversion holes.

The third aspect of the invention provides the use of the method of the first aspect or the structure of the second aspect in an in situ leaching field seal.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the field sealing seepage-proofing method provided by the invention, a horizontal seepage-proofing curtain is constructed between the ore-containing layer and the upper rock-soil body, so that the leaching effect on the ore-leaching layer containing the residual ore-leaching agent after rainfall infiltration is prevented, and the rainfall is directly discharged out of the ground surface in a clean water form without passing through the ore-leaching layer containing the residual ore-leaching agent after rainfall infiltration. The horizontal impervious curtain can greatly reduce the water amount of rainfall infiltrating to an ore leaching layer containing residual ore leaching agent, reduce leaching of the residual ore leaching agent on the ore leaching layer by the infiltration water amount, and reduce the generation amount of tail water and the concentration of pollutants in the tail water.

2. According to the mine field closing seepage-blocking structure provided by the invention, the horizontal seepage-blocking curtain is arranged on the surface of the ore body, so that a seepage-blocking barrier is provided for the ore body. The rock-soil body and the seepage-blocking barrier are connected into a whole, so that landslide is prevented, and the stability of the mountain body is ensured.

3. The mine field closing seepage-blocking method and the application of the mine field closing seepage-blocking structure in the in-situ leaching field closing, which are provided by the invention, provide an effective closing mode for the in-situ leaching field closing, can effectively prevent and treat the pollution of underground water in the mine field, and are strong in practicability and easy to popularize.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a mine field block seepage prevention structure provided in example 2;

FIG. 2 is a vertical sectional view of a horizontal impervious curtain provided in example 2;

FIG. 3 is a top view of the horizontal impervious curtain provided in example 2.

Icon: 1-horizontal impervious curtain; 11-grouting holes; 2-contour line; 3-a guide row structure; 31-diversion holes; 33-cutting off the flood drain; 4-ore body; 5-vegetation growth layer; 51-ground vegetation; 61-full weathering layer; 62-stroke stratum; 63-a slightly weathered layer; 64-unvulcanized bedrock; 71-diving surface; 72-liquid collecting roadway; 73-liquid collecting tank.

Detailed Description

In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "adjacent," "connected," and "connected" are to be construed broadly and their meanings in the present invention may be specifically understood by those skilled in the art.

The underground water of the in-situ leaching field has the characteristics of shallow burial, short runoff, close connection between the underground water and surface water and the like, the leaching field needs to be sealed after the leaching is finished, if the sealing is improper, pollutants such as ammonia nitrogen, sulfate, heavy metal and the like are released by the in-situ leaching field under rainfall leaching and enter the underground water, the surface water and surrounding soil to pollute the water-soil environment around the in-situ leaching field. According to the investigation result of the surface water of the ionic rare earth mining area in Ganzhou city in Jiangxi province, the overproof rates of ammonia nitrogen and total nitrogen in the surface water of the foot tunnel mining area in the Longnan are 100 percent, and the maximum overproof times are 295 times and 358 times respectively; the overproof rates of ammonia nitrogen, total nitrogen and pH in the surface water of the north mine area of Dingnan Ling are respectively 75%, 87.5% and 34.4%, and the maximum overproof times are respectively 112 times, 176 times and 1.47 times, so that the pollution is serious.

Due to the particularity of the in-situ leaching mining method, a large number of liquid injection holes need to be constructed in a leaching field, and a leaching agent needs to be injected into the holes. The mineralization condition of the ionic rare earth causes a great amount of pores or cracks to exist in rock-soil mass at the upper part of the ore bed, and the fine-particle soil mass is taken away after the mineral leaching agent is injected, so that the pores or cracks at the periphery of the liquid injection hole are enlarged. If the field sealing treatment is not carried out in time after the ore leaching is finished, rainwater can infiltrate into soil to leach an ore leaching layer containing residual ore leaching agent after rainfall, so that residual ammonia nitrogen, sulfate and other substances are taken away to enter a groundwater aquifer, and secondary pollution is caused to groundwater.

Therefore, aiming at the problem of water and soil pollution caused by improper field sealing of an in-situ leaching field, the invention develops a method capable of efficiently preventing the leaching agent from being left in a leaching layer by rain.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

The invention is further illustrated by the following specific examples, which, however, are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

Example 1

The embodiment provides a stope sealing seepage-proofing method, wherein the position of a horizontal seepage-proofing curtain is determined after mine production is finished, and grouting is carried out after grouting holes are arranged to form the horizontal seepage-proofing curtain.

The position of the horizontal impervious curtain is between the bottom 1m of the vegetation growing layer and the top surface of the mineral seam.

According to the field sealing seepage-proofing method provided by the invention, a horizontal seepage-proofing curtain is constructed between the ore-containing layer and the upper rock-soil body, so that the leaching effect on the ore-leaching layer containing the residual ore-leaching agent after rainfall infiltration is reduced, and the rainfall infiltration is directly discharged out of the ground surface in a clean water mode without passing through the ore-leaching layer containing the residual ore-leaching agent. The horizontal impervious curtain can greatly reduce the water amount of rainfall infiltrating to an ore leaching layer containing residual ore leaching agent, reduce the leaching of the infiltrating water amount on the residual ore leaching agent of the ore leaching layer, directly expose the earth surface in a clean water mode, directly discharge through a sewage disposal and diversion measure, and reduce the generation amount of tail water and the concentration of pollutants in the tail water.

The clean water as referred to in the present invention means water containing no mineral leaching agent.

The mine field closing seepage-resisting method provided by the invention is suitable for the mine field in which the ore is immersed in situ, and the ore body is positioned in the full weathered layer and the middle weathered layer. In the in-situ leaching process of a mine field, in order to protect the landform and the vegetation of a raw ore body from being damaged, a leaching agent is injected into the ore layer through a liquid injection hole, the leaching agent selectively leaches useful components in the ore, and a generated soluble compound enters a leaching agent solution and is lifted to the ground surface through a liquid collecting system to be processed and extracted to obtain metal.

The geologic body where the ore body is located includes from bottom to top range upon range of efflorescence basement rock, slightly weathered layer, well weathered layer, full weathered layer and vegetation growth layer, and the vegetation growth layer is last to grow there is the earth's surface vegetation, and the submergence is located well weathered layer.

After the in-situ leaching of a mine field is finished, a large number of liquid injection holes are formed in the mountain body, and the liquid injection holes and holes or cracks around the liquid injection holes can become rainwater permeation channels, so that rainwater reaches a leaching layer with residual leaching agents, and substances such as residual ammonia nitrogen and sulfate in the leaching process are taken away to enter an underground water-bearing layer, and secondary pollution is caused to underground water.

When the in-situ ore leaching mine field is sealed, the in-situ ore leaching system is washed by clean water, the ore leaching agent in the ore leaching system is recovered, the field is sealed when the concentration of the ore leaching agent in the recovered solution is less than or equal to 100ppm, and the concentration of the ore leaching agent in the recovered solution is typically, but not limited to, 0ppm, 10 ppm, 50 ppm or 100 ppm. And plugging the liquid injection hole during closing the field to block a main channel for contacting the residual mineral leaching agent in the mineral deposit with the outside.

In an in-situ leaching field, the position of a horizontal impervious curtain is determined between the position below 1m of the bottom of a vegetation growing layer and the top surface of the ore layer, and the horizontal impervious curtain is mainly formed by solidifying a impervious material and is used for isolating the leaching of rainwater on the upper part.

The anti-seepage material comprises, by mass, 70-80% of cement, 1-10% of bentonite, 2-5% of lime, 0.1-1% of an accelerator and the balance of water.

The cement comprises ordinary portland cement. The mass percentage of cement in the barrier material is typically, but not limited to, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79% or 80%.

The bentonite is an aqueous clay mineral mainly containing montmorillonite, wherein the dry weight of the montmorillonite is more than or equal to 70%.

The water content of the bentonite is less than or equal to 13 percent, and the swelling degree of the bentonite is more than 25mL/2 g.

The bentonite can adsorb in the seepage-resisting material and inhibit the deposition of cement particles, so that the water absorption of the slurry is reduced, the stability, the grouting property and the seepage-proofing property of the cement slurry can be improved by adding the bentonite, and the slurry concentration phenomenon is reduced. The amount of bentonite added is typically, but not limited to, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%.

Lime is typically added to the barrier material in an amount of 2%, 3%, 4% or 5% by weight, but not by way of limitation.

The accelerating agent is an additive which is mixed into the permeation-resistant material and can make the permeation-resistant material quickly set and harden. The accelerator is used for accelerating the hydration hardening of cement and forming enough strength in a short time so as to ensure the construction of a horizontal impervious curtain. In some embodiments of the present invention, the accelerator is typically, but not limited to, type I Hongxing, type 711, type I Yangquan, type Yao shan, type 73, or type 782.

In some embodiments of the invention, the barrier material is solidified at the location of the horizontal barrier curtain through the grouting holes to form the horizontal barrier curtain.

In some embodiments of the present invention, the number of the grouting holes is plural, the plurality of the grouting holes are arranged in a row, and a row pitch of the grouting holes is greater than or equal to 0.8m and less than or equal to 1.2 m;

and the pitch between the adjacent grouting holes is more than or equal to 0.8m and less than or equal to 1.2 m.

In some embodiments of the invention, the pitch of the grout holes is typically, but not limited to, 0.8m, 0.9m, 1.0m, 1.1m or 1.2m, and the pitch of the adjacent grouts of the same row is typically, but not limited to, 0.8m, 0.9m, 1.0m, 1.1m or 1.2 m.

In a preferred embodiment of the invention, the grouting holes are distributed according to the row spacing of 1m and the hole spacing of 1m, and the depth of the grouting holes is basically consistent, so that the horizontal impervious curtain formed by grouting is basically parallel to the slope surface.

After the grouting holes are arranged, high-pressure jet grouting is carried out by using a three-pipe method, in the process, a high-pressure water pump directly pumps clean water, under the pressure of 0.5-1.0MPa of grouting pressure, the jet range is larger, and the condensation surface area of the formed horizontal anti-seepage curtain is larger.

In some embodiments of the invention, the pressure of the grouting is typically, but not limited to, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa or 1.0 MPa.

In the grouting process, based on the diffusion in the spraying range under the action force of high-pressure water and compressed air, the permeation-resistant material is injected, the permeation-resistant material fills the pores/cracks of the peripheral rock-soil body, meanwhile, the permeation-resistant material is adhered with the rock-soil body to form a condensation body, and the condensation bodies are effectively connected to form the horizontal seepage-proof curtain, so that the purpose of permeation resistance is achieved.

And one day after grouting construction is finished, performing a water pressure test on the horizontal impervious curtain, testing the water permeability of the formed horizontal impervious curtain, and checking whether the horizontal impervious curtain has cracks or not and whether all coagulants form effective connection or not.

The water pressing test is specifically operated by measuring and reading water pressed at a certain flow rate every 3-5 min under the pressure of 0.2-0.5 MPa, calculating the difference between the maximum value and the minimum value in the continuous four readings, and finishing the test at the stage. And (3) requiring that the difference between the maximum value and the minimum value is less than 1L/min or the difference between the maximum value and the minimum value is less than 10% of the final value, or the water permeability after grouting is less than 10% of the water permeability before grouting, and then the water pressure test is qualified.

Finally, flow directing holes are provided at the slope at intervals of 9.5-10.5m elevation along the contour line, with typical but non-limiting elevations of 9.5m, 9.6m, 9.7m, 9.8m, 9.9m, 10.0m, 10.1m, 10.2m, 10.3m, 10.4m, or 10.5m in some embodiments of the invention.

In a preferred embodiment of the invention, the flow guide holes are arranged on the slope surface along the contour line at intervals of 10m in height and are distributed in a gradient manner along the contour line.

In some preferred embodiments of the invention, the slope of the bottom of the diversion hole is greater than or equal to 1 ‰, so that the diversion hole has a certain slope, which facilitates the diversion of seepage water from a slope body, and the seepage water flows out through the diversion hole, and the orifice of the diversion hole is provided with a intercepting and draining flood ditch along a contour line for collecting seepage water or rainwater from the diversion hole.

Example 2

This embodiment provides a mine field sealing seepage-blocking structure, such as the schematic diagram of the mine field sealing seepage-blocking structure shown in fig. 1. According to the mine field closing seepage-resisting structure provided by the invention, the horizontal seepage-resisting curtain 1 is arranged on the surface of the ore body, so that a seepage-resisting barrier is provided for the ore body 4, the phenomenon that seepage rainwater reaches an ore layer leaching ore layer to cause pollution is prevented, and the generation amount of tail water and the concentration of pollutants in the tail water are reduced. The rock-soil body and the seepage-blocking barrier are connected into a whole, so that landslide is prevented, and the stability of the mountain body is ensured.

The geologic body in which the ore body 4 is positioned comprises an undeweathered bed rock 64, a slightly weathered layer 63, an intermediate weathered layer 62, a fully weathered layer 61 and a vegetation growing layer 5 which are laminated from bottom to top, wherein the vegetation growing layer 5 is grown with surface vegetation 51, and a diving surface 71 is positioned in the intermediate weathered layer 62.

The ore body 4 of original place leaching is located between full regolith 61 and well regolith 62, soaks the ore in-situ in-process, and ore body 4 bottom is provided with receives liquid tunnel 72, receives liquid tunnel 72 and is used for collecting the leaching mother liquor that soaks the ore in-process seepage flow, receives liquid tunnel 72 and extends domatic and collecting reservoir 73 intercommunication, and collecting reservoir 73 is used for discharging the leaching mother liquor that collects in receiving liquid tunnel 72, and collecting liquid tunnel 72 and collecting reservoir 73 close after the stope is sealed.

The mine field closing seepage-proofing structure provided by the invention comprises a horizontal seepage-proofing curtain 1, wherein the horizontal seepage-proofing curtain 1 is positioned below a vegetation growth layer 5, is positioned in a full-weathered layer 61 and is positioned above the top surface of a mine body 4.

As shown in a vertical sectional view of the horizontal impervious curtain 1 of FIG. 2, the horizontal impervious curtain 1 is positioned in the weathered layer 61 above the top surface of the ore body 4 to insulate the upper portion of the horizontal impervious curtain 1 from rainwater or infiltration.

In a preferred embodiment of the invention, the horizontal impervious curtain 1 is parallel to the slope surface, and the slope surface extends out from one end of the horizontal impervious curtain close to the slope bottom.

FIG. 3 is a top view of a horizontal impervious curtain 1, grouting holes 11 communicated with the horizontal impervious curtain 1 are formed in a mountain body, the grouting holes 11 are uniformly distributed on the mountain body at the upper part of an ore body 4, and the depth of the grouting holes 11 is consistent.

The number of the grouting holes 11 is multiple, the grouting holes 11 are arranged in rows, and the row spacing of the grouting holes is more than or equal to 0.8m and less than or equal to 1.2 m; and the pitch between the adjacent grouting holes is more than or equal to 0.8m and less than or equal to 1.2 m.

In some embodiments of the invention, the pitch of the grout holes is typically, but not limited to, 0.8m, 0.9m, 1.0m, 1.1m or 1.2m, and the pitch of adjacent grouts in the same row is typically, but not limited to, 0.8m, 0.9m, 1.0m, 1.1m or 1.2 m.

And injecting a permeation-resistant material into the grouting hole 11, wherein the permeation-resistant material forms a horizontal seepage-resistant curtain 1 at the upper part of the ore body 4 and the bottom of the grouting hole 11. The intercepting and draining ditches 33 connect the diversion holes 31 on the same contour line 2 and extend from high to low to the bottom of the mountain along the contour line 2.

In a preferred embodiment of the present invention, the stope sealing seepage-resisting structure further comprises a drainage guide structure 3, and the drainage guide structure 3 is composed of diversion holes 31 and drainage flood interception ditches 33 as shown in fig. 1. The flood intercepting and draining ditch 33 is located at the opening of the diversion hole 31, is communicated with the diversion hole 31 and is used for collecting rainwater or seepage water drained from the diversion hole 31.

In a preferred embodiment of the present invention, one end of the horizontal impervious curtain 1 extending out of the slope surface is communicated with the drainage guide structure 3 for draining rainwater collected on the upper layer of the horizontal impervious curtain 1.

In a preferred embodiment of the present invention, in order to ensure the continuity of the seepage-blocking barrier, the grouting holes 11 and the seepage-blocking barrier formed by grouting the surrounding rock-soil mass are connected into a whole. Meanwhile, in order to ensure the stability of the mountain without landslide, a rainwater guiding and draining layer and a flood intercepting and draining ditch 33 are constructed on the mountain in layers, and the infiltrated rainwater is guided and drained out of the mountain in time.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A mine field closing seepage-proofing method is characterized in that the position of a horizontal seepage-proofing curtain is determined after mine production is finished, and grouting is carried out after grouting holes are distributed to form the horizontal seepage-proofing curtain;

the position of the horizontal impervious curtain is between the bottom 1m of the vegetation growing layer and the top surface of the mineral seam.

2. The mine field closing seepage-proofing method according to claim 1, characterized in that the closing is performed after the mine field is washed, and the concentration of an ore leaching agent in a solution obtained by washing is less than or equal to 100 ppm.

3. The mine closure permeability blocking method of claim 1, wherein the horizontal impervious curtains are formed primarily of a permeability blocking material after setting.

4. The method of claim 3, wherein the permeation-resistant material comprises, by mass, 70-80% of cement, 1-10% of bentonite, 2-5% of lime, 0.1-1% of an accelerator, and the balance of water.

5. The method according to claim 1, wherein the grouting holes are plural, and are arranged in rows, and the row pitch of the grouting holes is greater than or equal to 0.8m and less than or equal to 1.2 m;

and the hole distance between the adjacent grouting holes is more than or equal to 0.8m and less than or equal to 1.2 m.

6. The method of claim 1 further comprising a rain guide.

7. The method of claim 6, wherein the drainage of rainwater is performed by installing drainage holes and intercepting and draining flood trenches in the mountain.

8. A mine field closing seepage-resisting structure is characterized by comprising a horizontal seepage-resisting curtain;

the horizontal impervious curtain is positioned below the vegetation growth layer and above the top surface of the ore body;

the horizontal impervious curtain is parallel to the slope surface, and the slope surface extends out of one end close to the slope bottom.

9. The mine field seal seepage prevention structure of claim 8, further comprising a drainage guide structure, wherein the drainage guide structure comprises a diversion hole and a drainage intercepting flood trench;

the diversion holes are arranged on the slope surface, communicated with the flood intercepting and draining ditches and used for collecting rainwater guided out by the diversion holes.

10. Use of the method of mine closing permeability blocking according to any one of claims 1 to 7 or the structure of mine closing permeability blocking according to claim 8 or 9 in an in situ leaching mine closing.

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