CN102644464A - Constructing method for mining embedded artificial boundary ore pillar from open-pit to underground mine - Google Patents
Constructing method for mining embedded artificial boundary ore pillar from open-pit to underground mine Download PDFInfo
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- CN102644464A CN102644464A CN201210106771XA CN201210106771A CN102644464A CN 102644464 A CN102644464 A CN 102644464A CN 201210106771X A CN201210106771X A CN 201210106771XA CN 201210106771 A CN201210106771 A CN 201210106771A CN 102644464 A CN102644464 A CN 102644464A
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- 238000005065 mining Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 43
- 239000011435 rock Substances 0.000 claims abstract description 29
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 18
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- 238000003466 welding Methods 0.000 claims abstract description 5
- 210000003205 muscle Anatomy 0.000 claims description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 230000002787 reinforcement Effects 0.000 claims description 27
- 239000004567 concrete Substances 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 238000009412 basement excavation Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 230000009466 transformation Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
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- 229910052737 gold Inorganic materials 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
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- 230000002950 deficient Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a constructing method for mining an embedded artificial boundary ore pillar from an open-pit to underground mine. The constructing method comprises the following steps of: firstly, digging a trench at the boundary of an open-pit bottom ore body and surrounding rock as a transmitting road; secondly, carrying out robbing and filling on the ore body in the pit in three layers by adopting an upward drift filling method; requiring each layer of drift to overdraft and enter an upper-wall surrounding rock; after each drift is robbed, paving an artificial reinforced concrete false bottom and then filling; realizing the connection between every two filling units by connecting constructing ribs of adjacent drifts; after each layer of drift is robbed and filled, paving an artificial reinforced concrete false bottom in the trench and carrying out lap welding on connecting drift with constructing ribs of the trench; filling a layer height to next layer in the trench; and finally, forming the embedded artificial boundary ore pillar in the open-pit bottom. The pit bottom treatment is realized by using the method, so that the aims of recovering ore pillar resources, maintaining the slope stability, isolating open water burst, blocking off underground air leakage and stopping the influence on the underground production by external weather can be achieved.
Description
Technical field
The present invention relates to the mining technology, particularly a kind of transition from open-pit underground mine is exploited the construction process of embedded artificial boundary ore pillar.
Background technology
As everyone knows, when the ore body in mine buries more shallow or on the face of land arranged when appearing, be suitable for strip mining transformation.Strip mining transformation has rate of extraction height, the rate of dilution is low, output is big, cost is low and the advantage of job safety.But need peel off a large amount of Tu Yan to disclose ore body because of strip mining transformation, make its mining depth receive very big restriction.Along with the increase of mining depth, the strip mining transformation meeting is because of more and more being not suitable for the mine production requirement exploitation that need go underground.This earlier with open-air method exploitation top, mineral deposit, carry out the transition to the method for exploiting the bottom in mineral deposit then and be referred to as the transition from open-pit underground mining with the method for underground exploitation.Since the seventies in 20th century, a large amount of metal mines begins to adopt the transition from open-pit underground mining both at home and abroad.Particularly along with the rapid increase of social development to resource requirement, increasing surface mine all will face the problem of transition from open-pit underground mining.
For the mine of transition from open-pit underground mining, the productive life in whole mine generally will be passed through the transitional period and the underground mining phase three phases of strip mining transformation phase, open-air and underground unitized production.In transitional period and underground mining phase, generally all has safety problem open-air and underground while mining operations, especially when underground exploitation be to cheat beneath just when carrying out stoping operation in the open, underground mining can make a big impact to open slope stability; Simultaneously, cheat in the open that the seal at the end is bad to ventilate and water vent can make a big impact to the down-hole.Therefore, cheat the end in the open and must take rational engineering measure, could guarantee the safety and steady transition of transition from open-pit underground mining.
According to bibliographical information, bottom, transition from open-pit underground mining hole reason has two kinds of methods at present: a kind of is to reserve the boundary ore pillar, and promptly the top in first stage casing of bottom, hole underground mining keeps certain thickness ore pillar in the open; Second kind is through avalanche side slope or backfill barren rock, forms rock cover, to isolate open-air and underground production.
Before a kind of method be used for adopting open-stope method and filling method to carry out the mine of underground mining more.This method is calculated according to correlation theories such as K.B. Lu Bienieyite, dull and stereotyped beam theories, and the retention thickness of boundary ore pillar is between 10-30m, and according to the open-air hole size at the end, it takies the ore deposit amount generally between ten thousand tons of 15-30.Because of the boundary ore pillar belongs to the protectiveness ore pillar; Its rate of recovery lower usually (being generally 50-60%); Loss and dilution is huge; Cause the permanent waste of a large amount of non-renewable resources, bring the tremendous economic loss, lost the huge ore deposit amount that can be used for alleviating transition from open-pit underground mining transitional period production pressure simultaneously to mining.
A kind of method in back is used for adopting the avalanche method to carry out the mine of underground mining more.This method is with the mode in avalanche side slope or the open-air hole of barren rock backfill, forms certain thickness rock cover to satisfy the production requirement of avalanche method.Because rock deposit is loose in this rock cover; Particle is uneven, has a large amount of slits between the rock, and seal is poor; Certainly will bring following problem to production: the one, during rainy season; Open-air charge for remittance and ground precipitation can directly pass through covering layer in cheat and pour in the down-hole, bring immense pressure to drainage underground, also bring major safety risks to production; The 2nd, the down-hole ventilation system is prone to leak out, run the wind phenomenon, causes difficulty for the downhole production ventilating management; The 3rd, winter temperature descends, and cold air directly gets into the down-hole through covering layer, and the down-hole is prone to produce freezing, and the tunnel after freezing can make the vehicle ' difficulty, and operating condition worsens, and has a strong impact on production efficiency.
Summary of the invention
Defective to bottom, above-mentioned transition from open-pit underground mining hole reason technology; Task of the present invention provides the construction process that a kind of transition from open-pit underground mine is exploited embedded artificial boundary ore pillar; Adopt this method to cheat the bottom reason, reach recovery ore pillar resource, safeguard stability of slope, isolate open-air water burst, cut off the purpose that the down-hole leaks out, stops that outside weather influences downhole production.
Basic principle of the present invention is that the boundary ore pillar at the bottom of utilizing underground mining methods to open-air hole carries out back production; Use the filler bashing simultaneously; Make obturation and upper lower burrs country rock constitute the complete certain thickness artificial boundary ore pillar of buried orebody, to reach above purpose.
Transition from open-pit underground mine of the present invention is exploited the construction process of embedded artificial boundary ore pillar, may further comprise the steps:
(1) at first absolute altitude excavation groove is as transport routes at the bottom of the open-air hole, and groove is arranged in the end ore body of hole, and groove excavates to boundary ore pillar bottom surface by the gradient of movement requirement that absolute altitude flattens, and draws back along the ore body lower wall and is pushed into end group side slope toe;
(2) divide three layers to carry out back production to access back-filling method to ore body in cheating in the employing, the vertical ore body of extracting drift arranges that back production length is that ore body is thick entirely, and route wants the over-extraction entering to go up in the armor rock; In the same level, stopping sequence is " adopting one at a distance from one ", promptly first back production one step route, and back production two step routes again, back production successively from inside to outside, in the varying level, back production from bottom to top, two-layer up and down route interlaced arrangement;
The back production of (3) first slice drifts and filling:
Exploitation one step route after back production finishes, is laid the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route earlier; Artificial false bottom adopts individual layer steel mesh reinforcement structure, and steel mesh reinforcement is arranged in the bottom of artificial false bottom, and the structure muscle of steel mesh reinforcement (wearing the mineral ore direction) adopts indented bars, and the structure muscle of steel mesh reinforcement (along the mineral ore direction) adopts plain steel-bar; There is the structure muscle that connects adjacent route the steel mesh reinforcement both sides, and there is the structure muscle that connects route and country rock at the steel mesh reinforcement rear portion, and there is the structure muscle that connects route and groove the steel mesh reinforcement front portion; The shop is during muscle, with the structure muscle of the adjacent route of connection of the side right-angle bending that makes progress, makes it to be close to two step routes body sidewall to be dug up mine; Make a structure muscle part that connects route and country rock get into country rock, a part exposes; Seal the template bottom at route and establish the reinforcing bar preformed hole, the structure muscle that connects route and groove exposes through this hole, and buries the soil protection; After this, with concrete filling one step route, make the step route after the filling form embedded the connection with country rock;
After finishing, one step admission passage filling carries out two step drift stopings; After two step drift stopings finish, identical with a step route, lay the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route; Structure muscle with the pneumatic pick adjacent route of connection that one step route, one lateral bending of above-mentioned filling is bent picks out and straightening afterwards, overlaps with the steel mesh reinforcement of two step route artificial false bottom; The concrete interface of a step route is cleared up before the two step admission passage fillings, removed scum silica frost and float stone on the interface, and use flushing with clean water, filling two step routes then fuse a step route and two step routes after the filling each other;
After (4) first slice drift back production and filling finish; Carry out the filling of groove: before the groove filling, earlier hair is cut a hole at the interface between first slice drift and groove and handled; Simultaneously on this interface, add the planting reinforced bar into concrete that is made up of indented bars, the form of construction work of planting reinforced bar into concrete is identical with the form of construction work of anchor pole; Lay the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of groove, the structure of this artificial false bottom is identical with above-mentioned artificial false bottom; The groove artificial false bottom is connected with the structure muscle joint welding of groove with the route that is connected of the first slice drift artificial false bottom, and concrete to the second slice drift of a layer height of filling in groove is then accomplished being connected of first slice drift and groove;
(5) employing is carried out back production and filling to second slice drift and the 3rd slice drift successively with (3) and (4) same method; And to the filling of groove; Form the false end of REINFORCED CONCRETE ARTIFICIAL of the beneath buried orebody fully in open-air hole at last, accomplish the structure of the embedded artificial boundary ore pillar of transition from open-pit underground mining.
For the water burst in the open-air hole is compiled,, on the superiors' concrete cement plane at the false end of REINFORCED CONCRETE ARTIFICIAL of the complete buried orebody of said step (5), be provided with weathering and be positioned at the permanent puddle at the end, weathering slope so that in time discharge with pump.
The present invention compared with prior art has the following advantages:
1, lay the interior ore in boundary ore pillar and back production hole and carry out synchronously, adopt means open-air and that underground mining combines, reclaim the interior resource in hole to greatest extent, the rate of recovery can be brought up to more than 95%.
2, the boundary ore pillar of laying belongs to embedded composite construction artificial ore pillar, and this ore pillar is followed successively by the false end of high strength reinforced concrete, the false end of regular tenacity steel concrete and three layerings of plain concrete charges from the bottom to top.Each layering links to each other with the upper lower burrs country rock through the anchor pole welding; Form complete embedded composite construction, its intensity and enabling capabilities are greater than original ore deposit rock, integrality, good stability; Maintenance effect be can improve greatly, open-air and underground influencing each other isolated well side slope.
3, because the embedded artificial boundary ore pillar airtight performance of composite construction is good; Utilize the drainage grade of reserving on the artificial false bottom the superiors concrete cement plane open-air water burst to be compiled simultaneously with permanent puddle; And through the hole end fixed pump station in time discharge, thereby reach water proof and waterproof purpose better.
4, because the artificial boundary ore pillar of composite construction can be isolated open-air and underground production well, make the down-hole ventilation system not receive ectocine, can not run air leakage phenomena, thereby guarantee that down-hole ventilation system operation is normal.
Description of drawings
Accompanying drawing is the embodiment of the invention---domestic certain gold mine adopts the construction schematic diagram of the embedded artificial boundary ore pillar of the inventive method structure transition from open-pit underground mining, wherein:
Fig. 1 is construction principle plan view;
Fig. 2 is along Figure 1A-A sectional drawing;
Fig. 3 is Figure 1B-B paving figure (sectional view);
Fig. 4 excavates the groove sketch map for step of the present invention (1);
Fig. 5 is step of the present invention (a 2) drift stoping sketch map;
Fig. 6 is the false bottom structure sketch map of REINFORCED CONCRETE ARTIFICIAL in the step of the present invention (3);
Fig. 7 is an artificial false bottom steel mesh reinforcement front end partial enlarged drawing among Fig. 6.
Among the figure: 1-cheats in the open, 2-groove (transport routes) 3-hole end ore body, 4-first slice drift; 5-second slice drift, 6-the 3rd slice drift, 7-one step route; 8-two step routes, 9-connects the structure muscle of route and country rock, the structure muscle of 10-steel mesh reinforcement; 11-connects the structure muscle of adjacent route, the structure muscle of 12-steel mesh reinforcement, and 13-connects the structure muscle of route and groove.
The specific embodiment
Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.
Referring to figs. 1 through Fig. 6, the embedded artificial boundary ore pillar construction process of present embodiment gold mine transition from open-pit underground mining, construction sequence is following:
(1) 1 end absolute altitude excavation groove 2 from open-air hole at first, groove are arranged at the intersection of hole end ore body 3 and country rock, and groove excavates to boundary ore pillar bottom surface by the gradient of movement requirement that absolute altitude flattens, and draws back along the ore body lower wall and is pushed into end group side slope toe.
(2) divide three layers (first slice drift 4, second slice drift 5 and the 3rd slice drifts 6 among the figure) to carry out back production to access back-filling method from bottom to top to ore body in cheating in the employing; The vertical ore body of extracting drift is arranged extracting drift width 4m, the first slice drift 4m; High 3m; Back production length is that ore body is thick entirely, and route wants over-extraction, makes it to get into armor rock 2m; In the same level, stopping sequence is " adopting one at a distance from one ", promptly adopts a step route 7 earlier, after adopt two step routes 8, back production successively from inside to outside; In the varying level, back production from bottom to top, two-layer up and down route is answered interlaced arrangement.
The back production of (3) first slice drifts and filling:
Exploitation one step route 7 after back production finishes, is laid the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route earlier; Artificial false bottom adopts individual layer steel mesh reinforcement structure; Steel mesh reinforcement is arranged in the bottom of artificial false bottom; Protective layer thickness is 0.15m, and the structure muscle 10 of steel mesh reinforcement (wearing the mineral ore direction) adopts the 20HRB335 indented bars, and spacing is 0.25m; The structure muscle 12 of steel mesh reinforcement (along the mineral ore direction) adopts the 12R235 plain steel-bar, and spacing is 0.5mm; There is the structure muscle 11 that connects adjacent route the steel mesh reinforcement both sides; There is the structure muscle 9 that connects route and country rock at the steel mesh reinforcement rear portion; There is the structure muscle 13 that connects route and groove the steel mesh reinforcement front portion, and structure muscle 11,9 and 13 all adopts the 12R235 plain steel-bar, and spacing is respectively 0.25m; The shop is during muscle, with the structure muscle of the adjacent route of connection of the side right-angle bending that makes progress, makes it to be close to two step routes, 8 body sidewalls to be dug up mine; Make structure muscle 9 parts that connect route and country rock get into country rock, a part exposes; Seal the template bottom at route and establish the reinforcing bar preformed hole, the structure muscle 13 that connects route and groove exposes through this hole, and buries the soil protection; After this, with this route of concrete filling one step, make the step route after the filling form embedded the connection with country rock;
After finishing, 7 fillings of one step route carry out 8 back production of two step routes; After two step drift stopings finish, identical with a step route, lay the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route; Structure muscle with the pneumatic pick adjacent route of connection that one step route, one lateral bending of above-mentioned filling is bent picks out and straightening afterwards, overlaps with the steel mesh reinforcement of two step route artificial false bottom; Will clear up the concrete interface of a step route before the two step admission passage fillings, remove scum silica frost and float stone on the interface, and use flushing with clean water, filling two step routes then fuse a step route and two step routes after the filling each other;
After 4 back production of (4) first slice drifts and filling finish; Carry out the filling of groove 2: before the groove filling, earlier hair is cut a hole at the interface between first slice drift and groove and handled; Simultaneously on this interface, add the planting reinforced bar into concrete that is made up of indented bars, the form of construction work of planting reinforced bar into concrete is identical with the form of construction work of anchor pole; Lay the false end (structure of this artificial false bottom is identical with the first slice drift artificial false bottom) of REINFORCED CONCRETE ARTIFICIAL in the bottom of groove; The artificial false bottom of groove is connected with the mutual joint welding of structure muscle of groove with the route that is connected of the artificial false bottom of first slice drift; Concrete to the second slice drift 5 of a layer height of filling in groove is then accomplished being connected of first slice drift 4 and groove;
(5) employing is carried out back production and filling to second slice drift and the 3rd slice drift successively with step (3) and (4) same method; And, form the false end of REINFORCED CONCRETE ARTIFICIAL of complete buried orebody under the last hole in the open to the second time of groove and filling for the third time; Simultaneously, on artificial false bottom the superiors concrete cement plane, reserve and be beneficial to drainage grade that compiles water burst in the open-air hole and the permanent puddle that is positioned at the sloping end, the embedded artificial boundary ore pillar of transition from open-pit underground mining is promptly accused and is built up.
Claims (2)
1. a transition from open-pit underground mine is exploited the construction process of embedded artificial boundary ore pillar, it is characterized in that, may further comprise the steps:
(1) at first absolute altitude excavation groove is as transport routes at the bottom of the open-air hole, and groove is arranged in the end ore body of hole, and groove excavates to boundary ore pillar bottom surface by the gradient of movement requirement that absolute altitude flattens, and draws back along the ore body lower wall and is pushed into end group side slope toe;
(2) divide three layers to carry out back production to access back-filling method to ore body in cheating in the employing, the vertical ore body of extracting drift arranges that back production length is that ore body is thick entirely, and route wants the over-extraction entering to go up in the armor rock; In the same level, stopping sequence is " adopting one at a distance from one ", promptly first back production one step route, and back production two step routes again, back production successively from inside to outside, in the varying level, back production from bottom to top, two-layer up and down route interlaced arrangement;
The back production of (3) first slice drifts and filling:
Exploitation one step route after back production finishes, is laid the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route earlier; Artificial false bottom adopts individual layer steel mesh reinforcement structure, and steel mesh reinforcement is arranged in the bottom of artificial false bottom, and the structure muscle of steel mesh reinforcement adopts indented bars, and the structure muscle of steel mesh reinforcement adopts plain steel-bar; There is the structure muscle that connects adjacent route the steel mesh reinforcement both sides, and there is the structure muscle that connects route and country rock at the steel mesh reinforcement rear portion, and there is the structure muscle that connects route and groove the steel mesh reinforcement front portion; The shop is during muscle, with the structure muscle of the adjacent route of connection of the side right-angle bending that makes progress, makes it to be close to two step routes body sidewall to be dug up mine; Make a structure muscle part that connects route and country rock get into country rock, a part exposes; Seal the template bottom at route and establish the reinforcing bar preformed hole, the structure muscle that connects route and groove exposes through this hole, and buries the soil protection; After this, with concrete filling one step route, make the step route after the filling form embedded the connection with country rock;
After finishing, one step admission passage filling carries out two step drift stopings; After two step drift stopings finish, identical with a step route, lay the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of route; Structure muscle with the pneumatic pick adjacent route of connection that one step route, one lateral bending of above-mentioned filling is bent picks out and straightening afterwards, overlaps with the steel mesh reinforcement of two step route artificial false bottom; The concrete interface of a step route is cleared up before the two step admission passage fillings, removed scum silica frost and float stone on the interface, and use flushing with clean water, filling two step routes then fuse a step route and two step routes after the filling each other;
After (4) first slice drift back production and filling finish; Carry out the filling of groove: before the groove filling, earlier hair is cut a hole at the interface between first slice drift and groove and handled; Simultaneously on this interface, add the planting reinforced bar into concrete that is made up of indented bars, the form of construction work of planting reinforced bar into concrete is identical with the form of construction work of anchor pole; Lay the false end of REINFORCED CONCRETE ARTIFICIAL in the bottom of groove, the structure of this artificial false bottom is identical with above-mentioned artificial false bottom; The groove artificial false bottom is connected with the structure muscle joint welding of groove with the route that is connected of the first slice drift artificial false bottom, and concrete to the second slice drift of a layer height of filling in groove is then accomplished being connected of first slice drift and groove;
(5) employing is carried out back production and filling to second slice drift and the 3rd slice drift successively with step (3) and (4) same method; And to the filling of groove; Form the false end of REINFORCED CONCRETE ARTIFICIAL of the beneath buried orebody fully in open-air hole at last, accomplish the structure of the embedded artificial boundary ore pillar of transition from open-pit underground mining.
2. transition from open-pit underground mine according to claim 1 is exploited the construction process of embedded artificial boundary ore pillar; It is characterized in that, on the superiors' concrete cement plane at the false end of REINFORCED CONCRETE ARTIFICIAL of the complete buried orebody of said step (5), be provided with weathering and be positioned at the permanent puddle at the end, weathering slope.
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| CN103726849A (en) * | 2012-10-10 | 2014-04-16 | 马力 | Stoping technology for thin coal seam outside pit bottom of open pit coal mine |
| CN103758568A (en) * | 2014-02-14 | 2014-04-30 | 中国矿业大学 | Opencast coal mine end slope filling mining method |
| CN103790590A (en) * | 2014-01-22 | 2014-05-14 | 中钢集团马鞍山矿山研究院有限公司 | Technology for preventing and controlling underground floods in transitional period from surface mine to underground mine |
| CN103790587A (en) * | 2014-01-22 | 2014-05-14 | 中钢集团马鞍山矿山研究院有限公司 | Method for preventing and controlling underground floods in transitional period from surface mining to underground mining |
| CN104564136A (en) * | 2014-12-12 | 2015-04-29 | 锡林郭勒盟山金阿尔哈达矿业有限公司 | Artificial false bottom and manufacturing method thereof |
| CN104653224A (en) * | 2014-12-12 | 2015-05-27 | 河北联合大学 | Open pit tailing cemented filling treatment method |
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| CN106638891A (en) * | 2017-02-13 | 2017-05-10 | 中钢集团马鞍山矿山研究院有限公司 | Comprehensive water managing method in underground mining stage of open pit into underground mining |
| CN108286429A (en) * | 2018-01-22 | 2018-07-17 | 中国恩菲工程技术有限公司 | The partition method of more space water passages |
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| CN114412468A (en) * | 2022-02-07 | 2022-04-29 | 北京科技大学 | Caving-to-filling transition subsection and isolated ore pillar combined mining method |
| CN114776373A (en) * | 2022-06-20 | 2022-07-22 | 长春黄金研究院有限公司 | Artificial false bottom for thin-vein stope and manufacturing method |
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