CN113202471B - In-situ leaching mining method for pillar ore body of underground mine - Google Patents
In-situ leaching mining method for pillar ore body of underground mine Download PDFInfo
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- CN113202471B CN113202471B CN202110507885.4A CN202110507885A CN113202471B CN 113202471 B CN113202471 B CN 113202471B CN 202110507885 A CN202110507885 A CN 202110507885A CN 113202471 B CN113202471 B CN 113202471B
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- 238000002386 leaching Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005065 mining Methods 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 238000011049 filling Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000009423 ventilation Methods 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- 230000005641 tunneling Effects 0.000 claims description 6
- 241000521257 Hydrops Species 0.000 claims description 4
- 206010030113 Oedema Diseases 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 208000035404 Autolysis Diseases 0.000 claims description 2
- 206010057248 Cell death Diseases 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 230000028043 self proteolysis Effects 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 10
- 239000011707 mineral Substances 0.000 abstract description 10
- 238000011068 loading method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052770 Uranium Inorganic materials 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- 239000010931 gold Substances 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 9
- 239000002360 explosive Substances 0.000 description 7
- 230000000977 initiatory effect Effects 0.000 description 7
- 238000005422 blasting Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Remote Sensing (AREA)
- Civil Engineering (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses an in-situ leaching mining method for point pillar ore bodies of an underground mine, which is suitable for the extraction of underground metal mine high and large point pillars of copper, gold, uranium, manganese and other minerals which are not developed in underground water or have simple hydrological conditions and can be extracted by leaching. Firstly, constructing an artificial false roadway in a goaf, constructing an impermeable layer on the surface of a point column, carrying out cemented filling and roof connection on the goaf, then constructing the bottom of the point column to form a liquid loading roadway, liquid loading drilled holes and a liquid collecting tank, carrying out impermeable treatment, constructing the upper part of the point column to form ventilation holes, a leaching agent adding hole and installing a leaching agent adding pipe, adding a leaching agent into the point column from the leaching agent adding pipe, collecting the leaching solution into a liquid collecting tank through the liquid loading drilled holes and the liquid loading roadway at the lower part, and allowing the leaching solution in the liquid collecting tank to enter the next production link through self-flow or pumping. The invention has the advantages of safe operation, good ground pressure control effect, low cost and the like.
Description
Technical Field
The invention belongs to the field of underground mining, and particularly relates to an in-situ leaching mining method for underground mine point pillar ore bodies, which is particularly suitable for the extraction of underground metal mine high and large point pillars of minerals such as copper, gold, uranium, manganese and the like which are not developed in underground water or have simple hydrological conditions and can be extracted by leaching.
Background
At present, the common mining methods for gently inclined ore bodies in domestic mines mainly comprise a comprehensive method, a room-pillar mining method and a point-pillar upward horizontal seal filling mining method, the mining methods require that a certain proportion of point-pillar ore bodies are retained in a stope to serve as stope roof supports in the stope process, and the point-pillar ore bodies are generally subjected to permanent loss treatment, so that the mining loss rate index is high in the mining process.
Many miners, in order to improve the utilization rate of ore resources, have carried out certain research to the stoping of these point pillar pillars, and the stoping method that is more commonly used at present has: the method comprises an extraction method, a pillar cutting method, an artificial pillar replacement method, a full filling subsequent extraction method and the like, but in the practical application process, due to the factors of personnel and equipment operation safety, roof pressure management, blasting free surface control, filler mixing and the like, the implementation effect is poor, and the recovery rate index is low.
In view of the above, there is still a need to continue to research the extraction scheme of the spot pillar ore body until a safe, efficient and low-cost extraction method is provided to solve the above problems.
In view of the above-mentioned defects of the prior art, the present invention aims to provide an in-situ leaching mining method for pillar ore bodies of underground mines, which is to recover minerals by leaching the minerals with chemical reagents. The method is distinguished from drilling explosion type stoping of perforation, except for the tunneling operation, the use of initiating explosive devices is not involved in the normal production process, and in the formal production process, personnel and equipment move in a manual false roadway under the condition of covering a filling body without entering a stope, so that the safety is good.
Disclosure of Invention
In order to solve the technical problems, the invention provides an in-situ leaching mining method for a pillar ore body of an underground mine, which comprises the following steps:
step a, constructing a boundary from an artificial false roadway to a point pillar to be stoped in a goaf, wherein the route of the artificial false roadway is based on the principle of ensuring construction safety and recovering the point pillar as much as possible;
b, constructing an impermeable layer on the surface of the spot pillar, wherein the impermeable layer is composed of a concrete spray layer and an impermeable geomembrane, firstly spraying a layer of concrete on the surface of the spot pillar, the spraying thickness meets the requirement of pre-support strength and troweling the super mining pits as much as possible, and then externally arranging the impermeable geomembrane on the concrete spray layer;
c, filling the goaf by using a cemented filling body, wherein the filling body needs to ensure roof contact;
d, tunneling an effusion roadway from the end of the artificial false roadway to the boundary of the point column, constructing effusion drill holes on the side walls and the top of the effusion roadway, constructing a liquid collecting tank at the end of the effusion roadway, and paving an impermeable layer on the side walls of the effusion roadway and the liquid collecting tank;
e, drilling a middle roadway above the self-dotting column or a downward earth surface, constructing a plurality of vent holes on one side close to the end of the liquid accumulation roadway, installing anti-seepage sleeves in the vent holes to serve as a stope air return channel, and connecting the vent holes with a fan by adopting air pipes to form a mechanical extraction type ventilation loop; then constructing a leaching agent adding hole which is not communicated with the accumulated liquid roadway into the point column, wherein the orifice of the leaching agent adding hole is connected with a leaching agent adding pipe, and a switch valve is arranged on the leaching agent adding pipe;
and f, opening a switch valve, adding a leaching agent into the dotting columns through an autolysis agent adding pipe, collecting the leachate into a liquid collecting tank through a effusion drilling hole and an effusion roadway at the lower part, and enabling the leachate in the liquid collecting tank to enter the next production link through self-flowing or pumping.
In one embodiment of the above technical solution, the artificial false lane is a concrete false lane, the three-arch cross section is formed by erecting a template, the thickness of the concrete is 300mm, and the strength of the concrete is greater than or equal to C20.
In one embodiment of the above technical solution, the impermeable geomembrane has corrosion resistance, and the number of layers should not be less than 2.
In one embodiment of the above technical solution, the uniaxial compressive strength of the cemented filling body for 28 days is greater than or equal to 1.5 Mpa.
In an embodiment of the above technical scheme, the hydrops drilling is the crisscross cloth hole of quincunx, and drilling and horizontal plane inclination are greater than 15, and row spacing, pitch-row are all less than 1m, and the drilling row number is no less than 3 layers, and row number and hole depth satisfy the requirement of carrying out the hydrops to whole pointe post region.
In one embodiment of the above technical scheme, when the seepage-proof layer at the bottom of the effusion tunnel is laid, construction is performed from two sides of the tunnel to the central line of the tunnel and from the end of the tunnel to one side of the liquid collecting tank according to a slope angle of-2 degrees, so as to ensure that leachate automatically flows and is collected in the liquid collecting tank.
In one embodiment of the above technical solution, the pore diameter of the leaching agent addition pore is greater than or equal to 90mm, the mesh size is 5-8 m × 5-8 m, and the number and the depth of the leaching agent addition pore are determined according to the height and the planar range of the extraction point column and the flow range of the leaching agent.
Advantageous effects
Compared with the prior art and the method, the in-situ leaching mining method for the point pillar ore body of the underground mine provided by the invention has the following beneficial effects:
(1) the recovery mode provided by the invention is leaching recovery, namely, a chemical reagent is adopted to leach minerals, except for a tunneling operation, the use of initiating explosive devices is not involved in a normal production process, compared with a drilling and blasting method widely used in the production of underground mines at present, all safety risks of initiating explosive device transportation, storage, use and the like caused by the use of initiating explosive devices are avoided, in the formal production process, personnel and equipment move in a manual false roadway under the condition of covering a filling body, and meanwhile, the personnel and the equipment do not need to enter a stope, and the safety is good.
(2) The recovery mode provided by the invention has a good effect on the aspect of ground pressure control. By using the leaching stoping pillar, the strength reduction process of the pillar is relatively mild, the pillar can play a role similar to supporting and yielding, and the top plate of the dead zone slowly sinks until the top plate is contacted with a filling body, so that the ground pressure control effect is relatively good.
(3) According to the recovery mode provided by the invention, leached minerals flow into the effusion roadway from the effusion holes and are collected to the liquid collecting tank, and the leached minerals are conveyed by adopting a self-flow or pumping mode after the liquid level of the liquid collecting tank reaches a certain height, so that the whole process is operated, mechanical equipment is simple, a pipeline can be repeatedly used, and the production and maintenance cost is low.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is an elevation view of an in situ leaching mining method of an ore body of an underground mine spot pillar provided by the present invention;
FIG. 2 is a left side view of an in situ leaching mining method of an ore body of an underground mine pillar provided by the present invention;
FIG. 3 is a top plan view of an in situ leaching mining method of an ore body of an underground mine point pillar provided by the present invention;
FIG. 4 is a schematic diagram of the construction of an impermeable layer on the surface of a point pillar by an in-situ leaching mining method for an underground mine point pillar ore body provided by the invention;
in the figure: 1-middle section roadway or ground surface; 2-a vent hole; 3-cementing a filling body; 4-dot column; 5-barrier layer; 6-leaching agent adding tube; 7-drilling accumulated liquid; 8-liquid accumulation roadway; 9-artificial false lane; 10-a liquid collecting tank; 11-spraying concrete layer; 12-impermeable geomembrane; 13-Leaching the drug addition holes.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 1 to 4, in the in-situ leaching mining method for the underground mine spot pillar ore body disclosed in this embodiment, firstly, an artificial false tunnel 9 is constructed in a goaf, an impermeable layer 5 is constructed on the surface of the spot pillar 4, the goaf is cemented and filled to be connected with a roof, then, a liquid loading tunnel 8, a liquid loading drilling 7 and a liquid collecting tank 10 are constructed at the bottom of the spot pillar 4 and subjected to impermeable treatment, a vent hole 2 and a leaching agent adding hole 13 are constructed at the upper part of the spot pillar 4 and a leaching agent adding pipe 6 is installed, a leaching agent is added into the spot pillar 4 from the leaching agent adding pipe 6, a leaching solution is collected into the liquid collecting tank 10 through the liquid loading drilling 7 and the liquid loading tunnel 8 at the lower part, and the leaching solution in the liquid collecting tank 10 enters the next production link through self-flow or pumping.
The method comprises the following specific steps:
step a, constructing a boundary between an artificial false roadway 9 and a planned stoping point column 4 in the goaf, wherein the artificial false roadway 9 is a concrete false roadway with a three-center arch section, and is formed by erecting a template for pouring, the thickness of concrete is 300mm, and the strength of concrete is greater than or equal to C20. The route of the artificial drift 9 is based on the principle of ensuring the construction safety and recovering the point pillars 4 as much as possible.
And b, constructing an impermeable layer 5 on the surface of the spot pillar 4, wherein the impermeable layer 5 consists of a concrete spraying layer 11 and an impermeable geomembrane 12, spraying a layer of concrete on the surface of the spot pillar 4, the spraying thickness is 70mm, the strength is M10, leveling the super mining pits as much as possible, and then externally coating the impermeable geomembrane 12 on the concrete spraying layer 11, wherein the impermeable geomembrane 12 has the corrosion resistance and the number of the paved layers is not less than 2.
And c, filling the goaf by using the cemented filling body 3, wherein the filling body needs to ensure roof contact, and the 28-day uniaxial compressive strength of the cemented filling body 3 is more than or equal to 1.5 Mpa.
D, tunneling an effusion tunnel 8 from the end part of the artificial false tunnel 9 to reach the boundary of the point column 4, constructing effusion drill holes 7 on the side walls and the top part of the effusion tunnel 8, wherein the effusion drill holes 7 are distributed in a quincunx staggered manner, the inclination angle between the drill holes and the horizontal plane is more than 15 degrees, the row spacing and the hole spacing are both less than 1m, the number of drill holes is not less than 3, and the row number and the hole depth meet the requirements of effusion on the whole point column 4 area; a liquid collecting pool 1010 is constructed at the end part of the liquid accumulation roadway 8, an impermeable layer 5 is laid on the side wall of the liquid accumulation roadway 8 and the side wall of the liquid collecting pool 10, and when the impermeable layer 5 at the bottom of the liquid accumulation roadway 8 is laid, construction is carried out from two sides of the roadway to the central line of the roadway and from the end of the roadway to one side of the liquid collecting pool 10 according to a slope angle of-2 degrees, so that leachate is guaranteed to automatically flow and gather into the liquid collecting pool 10.
E, drilling a hole downwards from a middle roadway or the ground surface 1 above the point column 4, firstly constructing a plurality of vent holes 2 on one side close to the end of the liquid accumulation roadway 8, installing anti-seepage sleeves in the vent holes to serve as a stope air return channel, and connecting the orifices of the vent holes 2 with a fan by adopting air pipes to form a mechanical extraction type ventilation loop; and then constructing leaching agent adding holes 13 which are not communicated with the liquid accumulation roadway 8 into the point column 4, wherein the aperture of each leaching agent adding hole 13 is larger than or equal to 90mm, the mesh degree is 5-8 m multiplied by 5-8 m, and the number and the hole depth of each leaching agent adding hole 13 are determined according to the height and the plane range of the stoping point column 4 and the flowing range of the leaching agent. The orifice of the large-diameter deep hole is connected with a leaching agent adding pipe 6, and the leaching agent adding pipe 6 is provided with a switch valve.
And f, opening a switch valve, adding a leaching agent into the point column 4 from a leaching agent adding pipe, enabling the leaching agent to pass through micro cracks or structural surfaces in the ore body, enabling the leaching agent to chemically react with the ore body, enabling the leaching solution to be gathered into a liquid collecting tank 10 through a liquid collecting drill 7 and a liquid collecting roadway 8 at the lower part, and enabling the leaching solution in the liquid collecting tank 10 to enter the next production link through self-flowing or pumping.
Compared with the prior art and the method, the in-situ leaching mining method for the ore body of the underground mine spot pillar 4 provided by the invention has the following beneficial effects:
(1) the recovery mode provided by the invention is leaching recovery, namely, a chemical reagent is adopted to leach minerals, except for a tunneling operation, the use of initiating explosive devices is not involved in a normal production process, compared with a drilling and blasting method widely used in the production of underground mines at present, all safety risks of initiating explosive device transportation, storage, use and the like caused by the use of initiating explosive devices are avoided, in the formal production process, personnel and equipment move in a manual false roadway under the condition of covering a filling body, and meanwhile, the personnel and the equipment do not need to enter a stope, and the safety is good.
(2) The recovery mode provided by the invention has a good effect on the aspect of ground pressure control. By using the leaching stoping pillar, the strength reduction process of the pillar is relatively mild, the pillar can play a role similar to supporting and yielding, and the top plate of the dead zone slowly sinks until the top plate is contacted with a filling body, so that the ground pressure control effect is relatively good.
(3) According to the recovery mode provided by the invention, leached minerals flow into the effusion roadway 8 from the effusion holes and are collected to the liquid collecting tank, and the leached minerals are conveyed by adopting a self-flow or pumping mode after the liquid level of the liquid collecting tank reaches a certain height, so that the whole process is operated, mechanical equipment is simple, a pipeline can be repeatedly used, and the production and maintenance cost is low.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. An in-situ leaching mining method for a pillar ore body of an underground mine, which is characterized by comprising the following steps:
step a, constructing a boundary from an artificial false roadway to a point pillar to be stoped in a goaf, wherein the route of the artificial false roadway is based on the principle of ensuring construction safety and recovering the point pillar as much as possible;
b, constructing an impermeable layer on the surface of the spot pillar, wherein the impermeable layer is composed of a concrete spray layer and an impermeable geomembrane, firstly spraying a layer of concrete on the surface of the spot pillar, the spraying thickness meets the requirement of pre-support strength and troweling the super mining pits as much as possible, and then externally arranging the impermeable geomembrane on the concrete spray layer;
c, filling the goaf by using a cemented filling body, wherein the filling body needs to ensure roof contact;
d, tunneling an effusion roadway from the end of the artificial false roadway to the boundary of the point column, constructing effusion drill holes on the side walls and the top of the effusion roadway, constructing a liquid collecting tank at the end of the effusion roadway, and paving an impermeable layer on the side walls of the effusion roadway and the liquid collecting tank;
e, drilling a middle roadway above the self-dotting column or a downward earth surface, constructing a plurality of vent holes on one side close to the end of the liquid accumulation roadway, installing anti-seepage sleeves in the vent holes to serve as a stope air return channel, and connecting the vent holes with a fan by adopting air pipes to form a mechanical extraction type ventilation loop; then constructing a leaching agent adding hole which is not communicated with the accumulated liquid roadway into the spot column, wherein the leaching agent adding hole is connected with a leaching agent adding pipe, and a switch valve is arranged on the leaching agent adding pipe;
and f, opening a switch valve, adding a leaching agent into the point column through an autolysis agent adding pipe, collecting the leachate into a liquid collecting tank through a effusion drilling hole and an effusion roadway at the lower part, and enabling the leachate in the liquid collecting tank to enter the next production link through self-flowing or pumping.
2. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: the artificial false lane is a concrete false lane, the section of the three-center arch is formed by erecting a template and pouring, the thickness of the concrete is 300mm, and the strength of the concrete is greater than or equal to C20.
3. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: the anti-seepage geomembrane has the characteristics of corrosion resistance, and the number of the laid layers is not less than 2.
4. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: the uniaxial compressive strength of the cemented filling body for 28 days is more than or equal to 1.5 Mpa.
5. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: the hydrops drilling is crisscross cloth hole of quincunx, and drilling and horizontal plane inclination are greater than 15, and row spacing, pitch-row all are less than 1m, and the drilling row number is no less than 3 layers, and row number and hole depth satisfy the requirement of carrying out the hydrops to whole little columnar region.
6. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: when the seepage-proof layer at the bottom of the effusion roadway is laid, construction is carried out from two sides of the roadway to the central line of the roadway and from the end of the roadway to one side of the liquid collecting tank according to a slope angle of-2 degrees so as to ensure that leachate automatically flows and is collected into the liquid collecting tank.
7. The in-situ leaching mining method of the ore body of the underground mine spot pillar according to claim 1, characterized in that: the pore diameter of the leaching agent adding holes is larger than or equal to 90mm, the mesh degree is 5-8 m multiplied by 5-8 m, and the number and the depth of the leaching agent adding holes are determined according to the height and the plane range of the extraction point column and the flowing range of the leaching agent.
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| CN113847029B (en) * | 2021-09-09 | 2023-12-08 | 江西省修水香炉山钨业有限责任公司 | Surrounding column extraction method for underground mine high and large point column |
| CN114000859B (en) * | 2021-10-25 | 2022-11-08 | 紫金矿业集团股份有限公司 | Mining device and mining method based on leaching mining method |
| CN114856693B (en) * | 2022-04-19 | 2023-03-21 | 中南大学 | Filling and extracting method for point column ore body |
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| CN105736009B (en) * | 2016-02-04 | 2017-12-15 | 武汉科技大学 | Shrink dump leaching afterwards filling mining methods for Steeply dipping narrow deposits |
| CN108531726A (en) * | 2017-05-19 | 2018-09-14 | 东华理工大学 | A kind of Tailings Dam Situ Leaching liquid collecting tunnel mining technique and reaction unit |
| CN107178366B (en) * | 2017-07-28 | 2019-11-05 | 长沙矿山研究院有限责任公司 | A kind of stoping method of column ore body |
| CN111663950A (en) * | 2020-05-25 | 2020-09-15 | 山东黄金矿业(莱州)有限公司三山岛金矿 | Advanced support and earth pressure unloading mining method |
| CN111828007B (en) * | 2020-07-29 | 2022-08-16 | 中钢集团马鞍山矿山研究总院股份有限公司 | Stoping method for residual studs in underground mine goaf |
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