CN115110955A - Improved process for mining steeply inclined lenticular ore body by stage chamber method - Google Patents
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- 238000005065 mining Methods 0.000 title claims abstract description 73
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- 238000005422 blasting Methods 0.000 claims abstract description 27
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Abstract
An improved process for mining a steeply inclined lenticular ore body by a staged chamber method comprises the following steps: step 1, determining the stage height according to the occurrence characteristics of an ore body, and determining and constructing an extraarterial transportation roadway; step 2, constructing a bottom-levelling mining preparation project at the bottom of the ore block; step 3, constructing a stope cutting well, a pedestrian ventilation raise and a sectional rock drilling roadway; step 4, constructing a cutting groove: step 5, mining and rock drilling operation; constructing medium-length holes upwards in each section through a drilling machine; and 6, mining blasting operation: step 7, shovel loading and transportation; 8, recovering the ore stored in the gallery at each stage; step 9, residual mining at the bottom of the ore body and recovery of upper deposit ores; step 10, performing subsequent filling according to design requirements; and 11, recovering the ore pillars according to the primary design requirement. The invention avoids complex operations of splitting, leaking and trench, reduces safety risk, does not need to leave a funnel and permanent ore pillars at two sides of the trench, and improves mining recovery rate; the funnel bulk is not required to be processed, and the safety is improved.
Description
Technical Field
The invention belongs to the technical field of underground mining, and particularly relates to an improved process for mining a steeply inclined lenticular ore body by a staged chamber method.
Background
1. The steeply inclined lenticular ore body is an ore body which is thick in the middle and thin in the periphery, is lenticular on a section and has an inclination angle larger than 55 degrees.
2. The sublevel rock drilling stage chamber method mining divides the stope into two parts of a chamber and a pillar, and the chamber is mined firstly and the pillar is mined secondly. Bottom-drawing, splitting and leaking at the bottom of the chamber, drilling by sections, excavating a vertical cutting groove, ore falling in a deep hole or a medium-deep hole, discharging the ore falling out by the dead weight of the ore falling to the bottom of the chamber, and finally recovering the ore pillar by other methods.
3. The existing mining process has the following defects:
(1) the ore block arrangement mode with the bottom structure has the advantages of complex bottom structure, large engineering quantity, low safety and high loss rate. Firstly, the trench or funnel is in a mode of receiving ore and carrying by electric rakes, the production efficiency is low, the mining project occupation ratio is large, the dilution rate is high, and the recovery rate is low; secondly, the trench or the funnel is in a mode of ore receiving and trackless equipment transportation, the funnel and the trench are troublesome to construct, and the ore pillars on two sides are difficult to recover; the two arrangement modes are easy to cause large blocks to block the funnel or the trench, the processing blocking difficulty is high and unsafe, and the blasting processing is easy to damage the ring funnel, so that the subsequent maintenance is difficult; the amount of the stored ore in the dead zone at the bottom of the ore block cannot be effectively recovered by adopting a funnel or trench arrangement mode.
(2) When the ore blocks are arranged in a bottom-pillar-free flat bottom mode, the bottom ore blocks and the upper ore blocks are arranged in the same mode, and economic benefits are reduced. The arrangement mode of the bottom of the ore block at the thin part of the bottom ore and the thick part of the middle upper part ore is not different, the ore body of the ore block at the bottommost part is thin, the mining standard project is mostly positioned in the surrounding rock, the number of byproducts is less, the number of waste rocks is large, the dilution is large, and the economic benefit is reduced.
(3) The sectional height is determined to be 8-15m according to YGZ medium-length hole rock drills, and the influence of the performance of the medium-length hole rock drills is large.
(4) The sectional rock drilling lanes are arranged in parallel up and down but not staggered, so that the blasting time is short, ore collision is insufficient, a phenomenon that a bottom ore outlet is blocked by a large block is easily generated, sometimes, a root bottom is left due to incomplete local blasting, the danger of treating the root bottom is high, and the efficiency is low.
(5) The single rock drilling roadway is operated circularly, the operation space is small, the mechanized operation is not facilitated, and the ore removal efficiency is low.
(6) The triangular ore heap at the bottom of the goaf cannot be recovered in time in a flat-bottom ore receiving and traditional shoveling mode, so that permanent loss is caused.
Disclosure of Invention
The invention aims to provide an improved process for mining a steeply inclined lenticular ore body by a staged chamber method, which carries out targeted engineering arrangement and a recovery process according to occurrence characteristics of the steeply inclined lenticular ore body. And a remote control loader is used for entering the goaf to remove ores, so that the engineering arrangement and the mining process are improved.
An improved process for mining a steeply inclined lenticular ore body by a staged chamber method comprises the following steps:
step 1, determining the stage height according to the occurrence characteristics of an ore body, and determining and constructing an extraarterial transportation roadway;
the bottom flat-bed mining engineering comprises ore removal vein passing and bottom drawing lane, and is prepared for subsequent ore removal and transportation; the bottom structure of each stage adopts a bottom-bottom structure without bottom pillars, no hopper and no trench, and the scraper is used for loading and trackless transportation;
the cutting well, the pedestrian ventilation shaft and the subsection rock drilling roadway respectively cut the ore body from the vertical direction and the horizontal direction, the cutting well provides a free surface for subsequent slot expansion of the cutting slot, and the pedestrian ventilation shaft is a ventilation and pedestrian passage; the subsection rock drilling roadway excavates pedestrian communication roads to a mine room on a pedestrian ventilation shaft and a cutting shaft according to the designed subsection height, then tunnels in a mine body, and guarantees that each stope has two channels communicated with an upper stage and a lower stage for subsequent medium-length hole construction workplaces, thereby facilitating ventilation and later-stage pillar recovery; constructing sectional rock drilling roadways, increasing the sectional height from 15m to 20-25m, and arranging one or two rock drilling roadways according to different ore body thicknesses;
the construction of the cutting groove is based on a cutting well and is vertical to the length direction of the chamber, and the width of the cutting groove is the same as the width of the ore removal penetration pulse;
and 5, mining and rock drilling operation: constructing medium-length holes upwards in each section through a drilling machine;
step 6, mining blasting operation: upward blast holes are blasted in a layered mode, adjacent blast holes are loaded in a matched mode, and millisecond non-electric detonator subsection differential blasting is adopted; the upper and lower sections keep the upper section ahead of the lower section by one row of blasting, and the rock drilling roadways of the upper and lower sections are staggered, so that the blasting extrusion time is prolonged, the blasting block rate is reduced, and the safety of the sectional blasting operation is ensured.
Step 7, shovel loading and transportation: carrying out shoveling operation by an underground special shoveling vehicle with mine safety marks at the bottom structure of each stage, and carrying out centralized storage and transportation by the underground special transportation vehicle through an extravein transportation lane and a slope road to the ground surface or through a chute when no slope road exists;
8, recovering the ore stored in the gallery at each stage;
and 11, recovering the ore pillars according to the primary design requirement.
And step 1, determining occurrence characteristics of the ore body according to the geological survey result, wherein the occurrence characteristics comprise the burial depth, the depth of extension, the maximum horizontal thickness, the thickness of each horizontal position and each vertical position, and the position of a sharp vanishing point of the ore body.
The transportation lane described in step 1 is arranged at the position 13-15m away from the boundary line of the ore body and the lower tray.
The height of the stage in the step 1 is determined according to the thickness and the transportation capacity of the ore body, and the height of the stage is increased from 50m to 60-65 m.
In the step 2, the bottom flat structure of the lowest stage is arranged at the position of a section above the extinguishing point of the ore body tip, and the bottom structures of other stages are arranged at the position where the thickness of the ore body is more than 15 m; the auxiliary yield is convenient to improve, and the efficiency of the common scraper and the remote control scraper is improved.
In the step 2, the distance between the ore removal vein-passing is 10-13 m.
In the step 3, when the thickness of the ore body is less than 15m, arranging a rock drilling roadway; when the thickness of the middle ore body is larger than 15m, two rock drilling roadways are arranged, and the rock drilling roadways in the upper and lower sections are alternately subjected to explosion operation, so that the cycle time is reduced, and the productivity of a stope is increased.
In the step 8, because the ore body at the position of the bottom structure is thicker, the area of the formed dead zone is larger, and the ore enters the bottom of the dead zone by using an unmanned remote control loader or a scraper to recover and store the ore.
Compared with the prior art, the invention has the following beneficial effects:
1. the bottom structure of each stage is arranged at a thicker large part of the lenticular ore body, 2 vein-following rock drilling roadways are arranged in a first centralized mode, mining operations of the single rock drilling roadways are mutually supplemented, independent production can be achieved, and production efficiency is improved; the bottom space of the second wide stope is beneficial for the remote control device to enter the dead zone for recovering the stored ore, so that the mining recovery rate is improved; thirdly, complex splitting, leaking and trench operation is avoided, safety risks are reduced, a funnel and permanent ore pillars on two sides of the trench do not need to be left, and the mining recovery rate is improved; the large funnel blocks do not need to be processed, and the safety is improved.
2. The ore removal structure of the lowest ore block is arranged at 1 subsection position on the upper part of the lowest point, the occurrence characteristics of the bottom of the ore body can be proved by the lowest horizontal gallery ore exploration project, meanwhile, the residual deposit ore of the upper stage can be recovered after the residual deposit ore of the bottom section of the mining machine is communicated with the upper subsection, and the mining recovery rate is improved.
3. The upper and lower subsection rock drilling roadways are arranged in a staggered mode, so that the blasting extrusion time is increased, the block rate is obviously reduced, and the blasting effect is obvious.
4. The sectional height and the stage height are increased, the specific gravity of the chamber is increased, and the amount of mining accuracy engineering is reduced. The stage with the height of 20m-25m and the height of 60m can reduce 1 stage, and the stage height can be increased because the stage height is increased by the same number of stages.
5. The remote control loader enters the dead zone to recover the ores stored at the bottom, so that the recovery rate of mining is improved, personnel do not need to enter the dead zone to reduce safety risks, and mining informatization construction is promoted.
Drawings
FIG. 1 is a cross-sectional view of a representative section of the lenticular ore body of the present invention, section view line 126;
FIG. 2 is a longitudinal projection of the ore body of the present invention;
FIG. 3 is a plan view of the ore block bottom run out configuration of the present invention;
FIG. 4 is a plan view of a bottom block mining structure;
1. an extra-pulse transportation lane; 2. removing ore and threading; 3. drawing a bottom lane; 3' -rock drilling; 4. cutting a well; 5. a pedestrian ventilation shaft; 6. cutting the groove; 7. a medium-length hole; 8. stope studs; 9. a stope roofpost; 10. blasting the ore heap; 11. a gob; 12. sliding in a mine; 13. and (5) exploring the mine tunnel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
In the present embodiment, the staged chamber method is an improved mining process for mining steeply dipping lenticular bodies, as shown in fig. 1-4. The lowest pinch-out position of the ore body is horizontally provided with no bottom structure, and the bottom structure is lifted to the upper subsection.
The mining process is preferentially combined with the development of the slope way, and the ore rock is directly transported through the slope way, so that the transportation capacity is improved, and the productivity is increased; the short haul shaft 12 is provided as a necessary supplement to the ore at the bottom structure entering the lowest stage haulage roadway through the shaft without a ramp.
And (3) mining construction at the lowest stage: and after the mining of the upper ore body is finished at the stage, the lowest subsection residual mining and the recovery of the upper deposit ore are carried out.
An improved process for mining a steeply inclined lenticular ore body by a staged chamber method comprises the following steps:
step 1, determining stage height according to occurrence characteristics of ore bodies, determining and constructing an extravenal haulage roadway 1:
determining the height of the stage according to the characteristics of the ore body, namely the burial depth, the depth of extension, the maximum horizontal thickness, the thickness of each horizontal position and each vertical position, the position of a sharp vanishing point and the transportation capacity of the ore body, wherein the height of the determining stage is increased from 50m to 60m, and the upper part of the lens is 65 m;
determining an extravenal transport lane 1 at each stage according to the shape of the ore body, wherein the extravenal transport lane 1 is arranged at a position 13-15m away from the boundary line of the ore body and the footwall; adverse terranes are avoided, and the gradient of the line of the extravenal haulage roadway 1 meets the requirements of heavy-duty vehicle driving and drainage;
the bottom structure of each stage adopts a bottom-bottom structure without bottom pillars, no hopper and no trench, and the scraper is used for loading and trackless transportation; the bottom flat-bottom structure of the lowest stage is arranged at the position of a section above the extinguishing point of the ore body tip, and the bottom structures of other stages are arranged at the position of the thickness of the ore body larger than 15 m; the auxiliary yield is convenient to improve, and the efficiency of a common scraper and a remote control scraper is improved; the lowest level of the ore body is provided with a vein-following prospecting project, which is a prospecting project at the pinch-out position of the ore body and is also a residual mining recovery project of the lowest subsection ore body, and simultaneously, the function of recovering the upper subsection deposit ore is achieved;
constructing a bottom ore removal structure, constructing ore removal vein penetrating 2 from the extravein transport lane 1 to the direction of an ore body, wherein the distance between the ore removal vein penetrating 2 is 12 m; horizontally constructing a bottom-pulling roadway 3 at the bottom of the ore block according to different ore body thicknesses, and adopting a single bottom-pulling roadway 3 when the ore body thickness is not more than 15m, namely constructing bottom-pulling along the middle position of the ore body, wherein the bottom-pulling width meets the operation requirement of a shovel loader vehicle and the construction requirement of medium and deep holes; when the thickness of the ore body is larger than 15m, two bottom-drawing lanes 3 are constructed on two sides of the middle position of the ore body, and the width of each bottom-drawing lane 3 is required to meet the operation requirement of a shovel loader vehicle and the medium-length hole construction requirement;
the cutting well 4 is positioned at one side of the stope, and the ore block is longitudinally separated from other ore blocks through the cutting well 4 and provides a free surface for subsequent groove expanding construction of the cutting groove 6;
the pedestrian ventilation shaft 5 is positioned at the other side of the stope and is usually positioned in the middle of the stope stud 8, so that a working passage is created for subsequent large-scale mining and the ventilation problem of the sectional rock drilling roadway 3' in the next construction step is solved;
cutting an ore body in the 3' horizontal direction of the sectional rock drilling roadway to provide a working path and a working space for large-scale mining; 1-2 subsection rock drilling roadways 3 'are arranged in each subsection according to different thicknesses of ore bodies, 1 subsection rock drilling roadway 3' is arranged when the thickness of the ore bodies is smaller than 15m, 2 subsection rock drilling roadways 3 'are arranged when the thickness of the ore bodies is larger than 15m, the same subsection rock drilling roadway 3' is arranged in parallel, the distance between the subsection rock drilling roadways is not smaller than 5m, the subsection height is generally 20m, and the top ore body can be 25 m;
constructing a well and tunnel project with a cutting groove 6 providing a free surface and a compensation space for stoping blasting, performing medium-length hole broaching based on the cutting well 4, and ensuring the aperture
Vertical holes are adopted, 3 holes are arranged in each row, the hole pitch is 1m, and the row pitch is 1 m; the width of the cutting groove 6 is the same as that of the ore removal vein 2; the height of the ore block cutting groove 6 with the top pillar is reduced from the stage height to the top pillar height, and the height of the cutting groove 6 is the same as the stage height when the top pillar is not left;
and 5, mining and rock drilling operation: each section is upwards constructed with a YGZ90 type drilling machine to form a medium-length hole 7 with the diameter of the hole
During stoping, the distance between two adjacent rows of medium-length holes 7 is 1.5m, and the distance between the bottommost parts of the two adjacent medium-length holes 7 is 1.8-2.2 m; stope studs 8 and stope top studs 9 are reserved according to different occurrence characteristics of ore bodies; the two stope studs 8 are 8m, and the top of each stope is a 2m top stud;
and 6, mining blasting operation: upward blast hole layered blasting by adopting
Specially-made explosive cartridges are loaded between adjacent blast holes in a matching manner, millisecond non-electric detonator subsection differential blasting is adopted, an upper subsection leads a row of blasts in advance of a lower subsection during blasting, and rock chisels 3' of the upper subsection and the lower subsection are staggered to increase blasting extrusion time so as to ensure the safety of subsection blasting operation and generate a blasting ore pile 10 and a goaf 11;
step 7, shovel loading and transportation: carrying out shoveling operation by an underground special shoveling vehicle with mine safety marks at the bottom structure of each stage, and carrying out centralized storage and transportation by the underground special transportation vehicle through an extravein transportation lane 1 and a slope road to the ground surface or through a chute 12 when no slope road exists;
step 11, recycling the ore pillars according to the overall requirements of the primary design: the ore pillar is replaced by a filling body with a 1:4 sand-lime ratio, so that the safety is ensured and the resources are fully recovered.
Firstly, the bottom of each ore block is horizontally arranged at the thicker part of the ore body, the ore block is of a flat bottom structure without a funnel and a trench, a common underground loader is used for ore removal at ordinary times, and a remote control loader is used for entering the empty area for operation before the stoping of the chamber is finished. And the ore removal roadway at the lowest stage is lifted 1 section by section from the lowest level to the thicker part of the ore body. Two vein rock drilling roadways 3' are arranged in each layer of the ore block, the economic benefit of mining is improved, and the effect is achieved:
(1) the segmentation height is improved, the number of segments at the same stage height is reduced, the cost is reduced, and the efficiency is improved. The subsection height depends on the depth of the vertical hole in the center of the fan-shaped hole which can be constructed by the rock drilling machine, if the hole depth is too long, the rock drilling machine is difficult to construct due to difficult water supply, the central vertical hole can be translated towards two sides by adding the rock drilling lane 3', the hole depth of the blasting center construction inclined hole in the center of the ore body is improved, and therefore the subsection height is improved. Practice tests prove that the sectional height is increased to 20m from 12m, and the local ore body thinness can be increased to 25 m.
(2) The bottom structure is arranged at a thick and large part of an ore body, and the two parallel rock drilling roadways 3' can alternately operate, so that the mining efficiency is improved.
(3) The remote control loader is favorable for entering a stope to recover the ore stored in the gallery, and the mining recovery rate is improved.
Secondly, the arrangement density and the effect of the mining accurate project of the bottom and the upper ore block are different. The arrangement density of the mining preparation engineering at the bottom of the upper ore block is high, 2 vein-following roadways are arranged, one ore removal vein penetrating 2 is arranged every 13m in the direction vertical to the ore body, and the engineering plays a role of mining preparation; and the bottom ore block mining preparation project is only provided with 1 ore exploring vein roadway and 2-3 vein penetrations, and the projects have the functions of mining preparation, bottom section residual mining and upper storage gallery ore recovery.
Thirdly, double bottom drawing is arranged at the thick and big part, and 2 subsection rock chiseling roadways 3' are arranged on the upper part in a subsection mode, so that the subsection height is increased. The single roadway is located in the middle of the ore body, the double roadways are located on two sides of the center of the ore body, the distance between the edges of the double roadways is not less than 5m, the two roadways are respectively provided with vertical holes, and the same vertical hole depth causes different section heights due to the fact that the vertical holes are different in the middle of the ore body and the positions of the two roadways. The single cutting lane has a sectional height of 8-15m, and the double cutting lane has a sectional height of 20-25 m.
Fourthly, the upper part and the lower part are arranged in a staggered way in a segmented way, so that the blasting extrusion time is increased, and the large block rate is reduced.
Fifthly, double rock drilling and double bottom pulling lanes 3 are adopted, so that the working surface is increased, and the production efficiency is improved. One roadway is operated, and the other roadway is subjected to next cycle of operation preparation, so that the operation preparation and the preparation are mutually alternated, the pause time of an intermediate link is reduced, and the labor productivity is improved.
Sixthly, the position of not putting out at minimum stage ore body point is provided with the substructure of foundation, need not carry out complicated split leak or trench tunnelling work, need not retrieve funnel or trench side ore pillar, need not handle funnel or trench bold and block up the problem, improves mining efficiency, improves the mining rate of recovery, can not appear adopting accurate engineering and account for the problem of comparing too high, increases the security.
Claims (8)
1. An improved process for mining a steeply dipping lenticular ore body by a staged chamber method is characterized by comprising the following steps of:
step 1, determining the stage height according to the occurrence characteristics of an ore body, and determining and constructing an extraarterial transportation roadway;
step 2, constructing a bottom-leveling mining accurate project at the bottom of the ore block:
the bottom flat-bottom mining preparation project comprises ore removal vein passing and bottom drawing roadway and is used for preparing for subsequent ore removal and transportation; the bottom structure of each stage adopts a bottom-bottom structure without bottom pillars, no hopper and no trench, and the scraper is used for loading and trackless transportation;
step 3, constructing a stope cutting well, a pedestrian ventilation raise and a sectional rock drilling roadway:
the cutting well, the pedestrian ventilation well and the subsection rock drilling roadway respectively cut ore bodies from the vertical direction and the horizontal direction, the cutting well provides a free surface for subsequent slot expansion of the cutting slot, and the pedestrian ventilation well is a ventilation and pedestrian passage; the subsection rock drilling roadway excavates pedestrian communication roads to a mine room on a pedestrian ventilation shaft and a cutting shaft according to the designed subsection height, then tunnels in a mine body, and guarantees that each stope has two channels communicated with an upper stage and a lower stage for subsequent medium-length hole construction workplaces, thereby facilitating ventilation and later-stage pillar recovery; constructing segmented rock drilling roadways, increasing the segmentation height from 15m to 20-25m, and arranging one or two rock drilling roadways according to different ore body thicknesses;
step 4, constructing a cutting groove:
the construction of the cutting groove is based on a cutting well and is vertical to the length direction of the chamber, and the width of the cutting groove is the same as the width of the ore removal penetration pulse;
and 5, mining and rock drilling operation: constructing medium-length holes upwards in each section through a drilling machine;
and 6, mining blasting operation: carrying out layered blasting on the blast holes upwards, carrying out matched charging between the adjacent blast holes, carrying out sectional differential blasting by adopting a millisecond non-electric detonator, and keeping the upper section ahead of the lower section by one row of guns in the upper and lower sections;
step 7, shovel loading and transportation: carrying out shoveling operation by an underground special shoveling vehicle with mine safety marks at the bottom structure of each stage, and carrying out centralized storage and transportation by the underground special transportation vehicle through an extravein transportation lane and a slope road to the ground surface or through a chute when no slope road exists;
8, recovering the ore stored in the gallery at each stage;
step 9, residual mining at the bottom of the ore body and recovery of upper deposit ores;
step 10, performing subsequent filling according to design requirements;
and 11, recovering the ore pillars according to the primary design requirement.
2. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: and step 1, determining occurrence characteristics of the ore body according to the geological survey result, wherein the occurrence characteristics comprise the burial depth, the depth of extension, the maximum horizontal thickness, the thickness of each horizontal position and each vertical position of the ore body and the position of a sharp point.
3. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: the transportation lane described in step 1 is arranged at the position 13-15m away from the boundary line of the ore body and the lower tray.
4. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: the height of the stage in the step 1 is increased from the normal 50m to 60-65 m.
5. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: and in the step 2, the bottom flat-bottom structure of the lowest stage is arranged at the position of a section above the extinguishing point of the ore body tip, and the bottom structures of other stages are arranged at the position of the thickness of the ore body, which is more than 15 m.
6. The improved process for mining steeply dipping lenticular ore body by the staged room method as claimed in claim 1, wherein: in the step 2, the distance between the ore removal vein-passing is 10-13 m.
7. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: in the step 3, when the thickness of the ore body is less than 15m, arranging a rock drilling roadway; and when the thickness of the middle ore body is larger than 15m, arranging two rock drilling lanes, and alternately carrying out explosion operation on the upper and lower segmental rock drilling lanes.
8. The improved process for mining steeply dipping lenticular ore body by the staged chamber method as claimed in claim 1, wherein: in the step 8, because the ore body at the position of the bottom structure is thicker, the area of the formed dead zone is larger, and the ore enters the bottom of the dead zone by using an unmanned remote control loader or a scraper to recover and store the ore.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117722181A (en) * | 2024-02-07 | 2024-03-19 | 贵州息烽磷矿有限责任公司 | Method and system for mining steep-inclined thick and large ore body protection column |
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2022
- 2022-06-24 CN CN202210723346.9A patent/CN115110955A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117722181A (en) * | 2024-02-07 | 2024-03-19 | 贵州息烽磷矿有限责任公司 | Method and system for mining steep-inclined thick and large ore body protection column |
| CN117722181B (en) * | 2024-02-07 | 2024-04-26 | 贵州息烽磷矿有限责任公司 | Method and system for mining steep-inclined thick and large ore body protection column |
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