CN112031770A - Novel mining method suitable for multi-stope synchronous mining of thick and large ore body - Google Patents
Novel mining method suitable for multi-stope synchronous mining of thick and large ore body Download PDFInfo
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- CN112031770A CN112031770A CN202010950445.1A CN202010950445A CN112031770A CN 112031770 A CN112031770 A CN 112031770A CN 202010950445 A CN202010950445 A CN 202010950445A CN 112031770 A CN112031770 A CN 112031770A
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- 238000005065 mining Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000005553 drilling Methods 0.000 claims description 33
- 239000011435 rock Substances 0.000 claims description 33
- 238000011049 filling Methods 0.000 claims description 24
- 238000005422 blasting Methods 0.000 claims description 13
- 210000003462 vein Anatomy 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
Abstract
The invention discloses a novel mining method suitable for multi-stope synchronous mining of a thick and large ore body, which comprises the steps of dividing the ore body into a plurality of panels (20) along the trend of the ore body, and dividing the panels (20) into 4 stopes; a pulse-through transportation lane (5) is tunneled at the center of the bottom of the panel (20), a plurality of ore removal access ways (11) are tunneled from two sides of the pulse-through transportation lane (5) to penetrate through all stopes and serve as shoveling and transporting channels during ore recovery, and an ore collection trench (15) and a bottom pulling space (7) are arranged at the bottom of each stope. All stopes in the panel (20) share one through-vein transport lane (5), the No. 1 stope (16) and the No. 4 stope (19) are synchronously mined firstly, and after the stoping is finished and the stoping is filled, the rest two stopes are synchronously mined. The invention can realize air flow communication and improve the working environment of the working face; all stopes share one through-vein haulage roadway (5), so that the mining and cutting engineering quantity is reduced, and the mining production cost is reduced; one panel (20) is synchronously mined for 2 times, so that the ore production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of underground mining, and particularly relates to an underground mining method, which is particularly suitable for efficiently and quickly mining stable and steep and thick ore bodies of ore rocks.
Background
At present, mining methods for mining thick and large ore bodies of underground mines at home and abroad mainly comprise a sublevel caving method, a sublevel open-stope subsequent filling mining method and a layered filling mining method, and each mining method has applicability and characteristics. The sublevel caving and sublevel caving method is suitable for mines with stable ore rocks and allowed subsidence of the earth surface, and is gradually eliminated due to different degrees of subsidence in the range of the moving boundary of the earth surface after the recovery; the layered filling mining method is mainly used for mining ore vein with poor ore rock stability and high ore value, and due to layered extraction and filling, the ore mining cost is high and the production efficiency is low, and the method is only used for mining the valuable metal ore vein; the sublevel open stoping subsequent filling and sublevel open stoping subsequent filling mining method is mainly suitable for mines with stable ore rocks and ground surfaces which are not allowed to deform, and the goaf formed by the stoping adopts subsequent filling, so that the mining method has the characteristics of high production efficiency, low mining cost and good ground surface deformation control.
However, both the sublevel open stoping subsequent filling mining method and the sublevel open stoping subsequent filling mining method always adopt a separation mining mode and a mining mode, and a plurality of drift-through roadways and a bottom structure are arranged in one chamber, so that the mining engineering quantity is large, the shoveling operation is limited, and the production efficiency of ore blocks of the mining method cannot be further improved. Therefore, aiming at the steady thick and large ore body of the ore rock, how to reduce the mining and cutting engineering quantity, realize the synchronous coordinated production of multiple stopes and improve the mine productivity is a deep problem which needs to be explored and solved by current mining workers.
Chinese patent CN201610439450.X discloses a novel underground mine underground dual-stope collaborative mining method, which has the technical scheme that: a vein-following drift parallel to the running direction of the ore body is arranged outside the footwall vein of the ore body, the thick ore body is divided into a plurality of ore blocks along the running direction, each ore block is divided into a left stope and a right stope, two adjacent stopes share one ore removal drift, the left stope and the right stope simultaneously carry out stoping, and the working surface of the left stope is ahead of the working surface of the right stope. Although the method realizes the double-stope collaborative mining and improves the production capacity of the ore blocks, the method also has the following technical defects:
(1) two adjacent stopes are mined simultaneously, the exposed area of a goaf is large, and especially when both sides of the stope in the two steps are filled with filling bodies, the stope stability is poor;
(2) only a vein-following gallery is arranged on the lower wall of an ore body, a single-head working face is arranged in a stope, rock drilling, blasting and ore removal and ventilation of a scraper in the stope are difficult, and the operation environment is severe;
(3) two adjacent stopes share a ore removal roadway and a chute, and the left and right stope scraper conveyors are easy to generate mutual interference when simultaneously removing ores, so that the lifting and the scraping efficiency are not facilitated.
Disclosure of Invention
The invention aims to provide a novel mining method which is suitable for multi-stope synchronous mining of thick and large ore bodies, can synchronously operate in multiple stopes, reduces the amount of mining-preparation cutting engineering, improves the stoping operation environment and improves the production efficiency of the stopes, aiming at the defects in the prior art.
In order to realize the aim, the novel mining method suitable for multi-stope synchronous mining of the thick and large ore body adopts the following technical scheme to carry out stoping:
1) arranging an upper-disk vein-following transportation lane in the upper-disk surrounding rock along the trend of the ore body at a transportation level, and arranging a lower-disk vein-following transportation lane in the lower-disk surrounding rock; and arranging upper pan ore pass shafts on one side of the upper pan vein-following transportation lane and lower pan ore pass shafts on the lower pan vein-following transportation lane at intervals of 60-100 m along the direction of the ore body.
2) Dividing the ore body into panels every 46-70 m along the direction of the ore body, wherein each panel is divided into 4 stopes, and the number of each stope is 4 stopes including a No. 1 stope, a No. 2 stope, a No. 3 stope and a No. 4 stope from left to right; the stope 1 and the stope 4 adopt the same stope width, preferably 15-20 m; the stope width of the No. 2 stope and the stope width of the No. 3 stope are kept the same, and the stope width is preferably 8-15 m; the stope width of the No. 2 stope and the No. 3 stope positioned in the middle is smaller than the stope width of the No. 1 stope and the No. 4 stope positioned on two sides.
3) Driving a vein-penetrating transport lane in the direction perpendicular to the ore body at the bottom of the panel area, wherein the vein-penetrating transport lane connects the lower-wall vein-penetrating transport lane with the upper-wall vein-penetrating transport lane; and a plurality of ore removal access ways are tunneled from the two sides of the vein-through transportation lane to the central position of the bottom of each stope according to the designed intervals, and the included angle between the vein-through transportation lane and the ore removal access ways is 35-50 degrees, preferably 40-45 degrees.
The distance between adjacent ore removal routes is generally 6 to 16m, preferably 8 to 12 m.
4) A vertical ore body trend is respectively arranged at the centers of the bottoms of a No. 1 stope and a No. 4 stope, a vertical cutting groove is arranged at the end part or the center of the ore collecting trench, then a rock drilling device is used for drilling towards a fan-shaped medium-length hole at the top of the ore collecting trench, a bottom-drawing space with the height of 8-15 m is formed after the vertical cutting groove is used as a free compensation space and is arranged and exploded, and partial collapse ore is reserved in the bottom-drawing space to serve as a buffer cushion layer of the collapse upper ore body.
5) Drilling a downward large-diameter deep hole in a drilling chamber positioned at the tops of a No. 1 stope and a No. 4 stope by using a drilling device, carrying out sectional blasting from bottom to top or carrying out sublevel caving on the upper ore body of the stope from an upper disc to a lower disc by taking a bottoming space and a vertical cutting groove as free surfaces, and unloading the caving ore in the No. 1 stope and the No. 4 stope into an upper disc chute or a lower disc chute through a vein-passing transportation roadway according to the 'near principle' by using 1-2 shoveling machines, so that synchronous coordinated mining of the No. 1 stope and the No. 4 stope is realized.
6) And (3) performing cemented filling after the stoping of the No. 1 stope and the No. 4 stope is finished, and mining the No. 2 stope and the No. 3 stope by adopting the same stoping processes of 4) and 5) after the filling body reaches the designed maintenance strength.
In practical application, the No. 1 stope and the No. 2 stope share one ore removal route, and the No. 3 stope and the No. 4 stope share the other ore removal route; only one vein-penetrating transport lane is arranged in each panel area, and the vein-penetrating transport lane is located in the center of the junction of the bottoms of the No. 2 stope and the No. 3 stope. The structural arrangement mode is beneficial to reducing the cutting engineering quantity.
The step 5) of the bottom-up sectional blasting refers to dividing the ore body on the upper part of the stope into a plurality of sections from bottom to top, wherein the height of each section is 10-15 m, and the ore body on the upper part of the stope is caved in a sectional blasting mode.
The novel mining method suitable for multi-stope synchronous mining of thick and large ore bodies has the following positive effects after the technical scheme is adopted:
(1) when thick and large ore bodies with better ore rock stability are mined, only one vein-through transportation lane needs to be arranged in the center of the bottom of the panel area, and all stopes in the panel area share the vein-through transportation lane, so that the mining-cutting ratio of one thousand tons is reduced by about 35%, the mining-standard specific gravity is reduced by about 29%, and the mining-cutting engineering quantity is effectively reduced.
(2) The No. 1 stope and the No. 4 stope can be used for drilling, blasting and ore removal at the same time, a scraper is used for carrying the collapsed ore to the upper and lower pass nearby, ore removal work is not affected mutually, and synchronous mining of the two stopes can be realized; the specifications of No. 2 and No. 3 stopes can be flexibly changed according to the stability of the filling body, whether the No. 2 and No. 3 stopes are synchronously mined or not is determined, the production efficiency is improved by 50% during simultaneous mining, the production efficiency is improved by 33% during successive mining, and safe and efficient large-scale mining of thick and large ore bodies is realized to a great extent.
(3) During stope stoping, the upper tray vein-following transportation lane is also used as a return air lane, fresh air flows through the lower tray vein-following transportation lane and the vein-penetrating transportation lane to converge the upper tray vein-following transportation lane, and finally is discharged to the ground surface through the middle section return air shaft and the return air vertical shaft, so that the ventilation operation environment of the stope is effectively improved.
(4) When stopes are filled, particularly when two stopes in the middle of the panel are filled, the retaining walls are only required to be respectively built on two sides of the bottom pulse-through conveying roadway and filled at one side, the filling operation efficiency is improved, and the filling material cost is reduced.
Drawings
Fig. 1 is a front view of a new mining method suitable for multi-stope synchronous mining of thick ore bodies.
Fig. 2 is a top view of a new mining method suitable for multi-stope synchronous mining of thick ore bodies, namely: FIG. 1 is a A-A diagram.
Fig. 3 is a side view of a new mining method suitable for multi-stope synchronous mining of a thick ore body, namely a C-C diagram in fig. 2.
Labeled as: 1-a lower-plate vein-following transportation lane; 2-hanging a plate and conveying along the vein; 3-drilling a horizontal lower-plate transportation lane; 4-rock drilling horizontal loading roadway; 5-a vein-through transport lane; 6-ore caving; 7-a bottoming space; 8-large diameter deep hole; 9-drilling connecting roadway; 10-a rock drilling chamber; 11-ore removal and access; 12-a footwall drop shaft; 13-hanging the pan pass; 14-a filler body; 15-collecting the ore trench; stope No. 16-1 (stope); stope # 17-2 (stope); stopes No. 18-3 (stopes); stope # 19-4 (stope); 20-disc area; 21-hanging a rock contact surface; 22-footwall rock interface.
Detailed Description
In order to better describe the invention, a new mining method suitable for multi-stope synchronous mining of a thick and large ore body is described in further detail below with reference to the accompanying drawings.
The front view of the novel mining method suitable for multi-stope synchronous mining of thick and large ore bodies shown in figure 1 is combined with figures 2 and 3, and the novel mining method suitable for multi-stope synchronous mining of thick and large ore bodies is adopted for stoping by adopting the following processes:
1) an upper-disk vein-following transportation lane 2 is arranged in the upper-disk surrounding rock along the trend of the ore body at the transportation level, and a lower-disk vein-following transportation lane 1 is arranged in the lower-disk surrounding rock; an upper pan drop shaft 13 is respectively arranged on one side of the upper pan vein-following transportation lane 2 every 60-100 m along the direction of the ore body, and a lower pan drop shaft 12 is arranged on one side of the lower pan vein-following transportation lane 1; arranging a rock drilling horizontal upper wall roadway 4 in the upper wall surrounding rock at the rock drilling level along the trend of the ore body, and arranging a rock drilling horizontal lower wall conveying roadway 3 in the lower wall surrounding rock at the rock drilling level along the trend of the ore body;
2) dividing the ore body into one panel area 20 every 46-70 m along the direction of the ore body, and dividing each panel area 20 into 4 stopes including a No. 1 stope 16, a No. 2 stope 17, a No. 3 stope 18 and a No. 4 stope 19 from left to right; the No. 1 stope 16 and the No. 4 stope 19 keep the same stope specification, and the width is 16-20 m; the No. 2 stope 17 and the No. 3 stope 18 keep the same stope specification, and the width is 8-15 m;
3) a vein-penetrating transport lane 5 is tunneled in the direction perpendicular to the ore body at the bottom of the panel 20, and the vein-penetrating transport lane 5 is used for communicating the lower-disc vein-penetrating transport lane 1 with the upper-disc vein-penetrating transport lane 2; excavating a plurality of ore removal access roads 11 from two sides of the vein-through transportation lane 5 according to the designed interval to reach the central position of the bottom of each stope, wherein the included angle between the vein-through transportation lane 5 and the ore removal access roads 11 is 35-50 degrees; the distance between adjacent ore removal inlet passages 11 is 8-12 m;
4) arranging an ore collecting trench 15 in the center of the bottom of a No. 1 stope 16 and a No. 4 stope 19 respectively along the vertical ore body direction, arranging 1 vertical cutting well with the height of 8-15 m at the end or the center of the ore collecting trench 15, brushing the vertical cutting well to form a vertical cutting groove through shallow hole blasting, communicating the ore collecting trench 15 with an ore outlet route 11, respectively extending two ends of the ore collecting trench 15 to an upper disc boundary, an upper disc ore rock contact surface 21 and a lower disc boundary, a lower disc ore rock contact surface 22 of a stope, drilling upward a fan-shaped medium-length hole at the top of the ore collecting trench 15 by using a rock drilling device, forming a bottom-drawing space 7 with the height of 8-15 m after the vertical cutting groove is used as a free compensation space to be gradually exploded, and reserving a part of falling ore 6 in the bottom-drawing space 7 as a buffer cushion layer for caving the upper ore bodies;
5) drilling a downward large-diameter deep hole 8 in a drilling chamber 10 positioned at the top of a No. 1 stope 16 and a No. 4 stope 19 by using drilling equipment, wherein the drilling chamber 10 is respectively communicated with a drilling horizontal upper wall roadway 4 and a drilling horizontal lower wall conveying roadway 3 through drilling connecting roadways 9 on two sides of the drilling chamber; taking the bottom drawing space 7 and the vertical cutting groove as free surfaces, and adopting sectional blasting from bottom to top or separately discharging ore bodies on the upper part of the caving stope from the upper disc to the lower disc; when ore is removed, 1-2 scraper conveyors are operated to shovel the caving ore 6 in the No. 1 stope 16 and the No. 4 stope 17 from the ore removal route 11 and then discharge the shoveled ore into the upper pan drop shaft 13 or the lower pan drop shaft 12 through the drift conveyor 5, so that the ore removal operation of the No. 1 stope 16 and the No. 4 stope 19 can be simultaneously carried out according to the 'nearby principle' to avoid mutual interference during the operation of the scraper conveyors, and the synchronous coordinated mining of the No. 1 stope and the No. 4 stope is realized;
the bottom-to-top segmented blasting is to divide the ore body on the upper part of the stope into a plurality of segments from bottom to top, the height of each segment is 10-15 m, and the ore body on the upper part of the stope is caved in a segmented blasting mode.
6) After the stoping of the No. 1 stope 16 and the No. 4 stope 19 is finished, the bottom of each ore removal access 11 is sealed by a filling retaining wall, water filtering holes are reserved on the retaining wall, then a filling pipe network is laid to the stope from a rock drilling horizontal rock drilling connecting roadway 9 to carry out cemented filling, the stope mining work close to the stope can be carried out to carry out cemented filling after a filling body 14 reaches the designed maintenance strength, the No. 2 stope 17 and the No. 3 stope 18 are mined by adopting 4) and 5) the same stoping process after the stoping is finished, one retaining wall is respectively built on each side of the vein-penetrating transportation roadway 5, then the filling operation is carried out at the rock drilling level, and the filling and roof connecting are ensured. By this point, the stope recovery is completed within the entire panel 20.
The No. 1 stope 16 and the No. 2 stope 17 share the ore removal route 11 on one side, and the No. 3 stope 18 and the No. 4 stope 19 share the ore removal route 11 on the other side; only one vein-crossing conveyor lane 5 is arranged in each panel 20, and the vein-crossing conveyor lane 5 is located in the center of the junction of the bottoms of the No. 2 stope 17 and the No. 3 stope 18.
Claims (6)
1. A new mining method suitable for multi-stope synchronous mining of thick and large ore bodies is characterized by adopting the following processes for stoping:
1) an upper-disk vein-following transportation lane (2) is arranged in the upper-disk surrounding rock along the trend of the ore body at the transportation level, and a lower-disk vein-following transportation lane (1) is arranged in the lower-disk surrounding rock; an upper pan drop shaft (13) is arranged on one side of the upper pan vein-following conveying lane (2) every 60-100 m along the direction of the ore body, and a lower pan drop shaft (12) is arranged on one side of the lower pan vein-following conveying lane (1);
2) dividing the ore body into one panel area (20) every 46-70 m along the direction of the ore body, wherein each panel area (20) is divided into 4 panels from left to right, namely a No. 1 panel (16), a No. 2 panel (17), a No. 3 panel (18) and a No. 4 panel (19);
3) a vein-penetrating transport lane (5) is tunneled in a direction perpendicular to the ore body at the bottom of the panel (20), and the vein-penetrating transport lane (5) is used for communicating the lower-tray vein-penetrating transport lane (1) with the upper-tray vein-penetrating transport lane (2); excavating a plurality of ore removal access roads (11) from two sides of the vein-penetrating transportation lane (5) according to the designed interval to reach the central position of the bottom of each stope, wherein the included angle between the vein-penetrating transportation lane (5) and the ore removal access roads (11) is 35-50 degrees;
4) arranging an ore collecting trench (15) in the center of the bottom of a No. 1 stope (16) and a No. 4 stope (19) respectively along the vertical ore body direction, arranging a vertical cutting groove at the end or the center of the ore collecting trench (15), drilling on the top of the ore collecting trench (15) by using a rock drilling device to form a fan-shaped medium-length hole, arranging and blasting the vertical cutting groove as a free compensation space one by one to form a bottom-drawing space (7) with the height of 8-15 m, and reserving a part of the caving ore (6) in the bottom-drawing space (7) as a buffer cushion layer of the caving upper ore body;
5) drilling a downward large-diameter deep hole (8) in a rock drilling chamber (10) positioned at the top of a No. 1 stope (16) and a No. 4 stope (19) by using rock drilling equipment, carrying out sectional blasting from bottom to top or discharging ore bodies on the upper part of the stope from an upper disc to a lower disc by using a bottoming space (7) and a vertical cutting groove as free surfaces, and operating a scraper to shovel and load the caving ore (6) in the No. 1 stope (16) and the No. 4 stope (17) from an ore discharging route (11) and then discharge the ore into an upper disc chute (13) or a lower disc chute (12) through a vein passing transport roadway (5), so that synchronous coordinated mining of the No. 1 stope and the No. 4 stope is realized;
6) and (3) performing cemented filling after the stoping of the No. 1 stope (16) and the No. 4 stope (19) is finished, and mining the No. 2 stope (17) and the No. 3 stope (18) by adopting the same stoping processes of 4) and 5) after the filling body (14) reaches the designed maintenance strength.
2. A new method of mining adapted for multi-stope simultaneous mining of large and thick ore bodies according to claim 1, wherein: the No. 1 stope (16) and the No. 4 stope (19) keep the same stope specification, and the width is 15-20 m; the No. 2 stope (17) and the No. 3 stope (18) keep the same stope specification, and the width is 8-15 m; the specification of the No. 2 stope (17) and the No. 3 stope (18) positioned in the middle is smaller than that of the No. 1 stope (16) and the No. 4 stope (19) positioned on two sides.
3. A new method of mining adapted for multi-stope simultaneous mining of large and thick ore bodies according to claim 2, wherein: the No. 1 stope (16) and the No. 2 stope (17) share one ore removal access (11), and the No. 3 stope (18) and the No. 4 stope (19) share the other ore removal access (11).
4. A new method of mining adapted for multi-stope simultaneous mining of large and thick ore bodies according to claim 3, wherein: the distance between adjacent ore removal access ways (11) is 8-12 m.
5. A new method of mining adapted for multi-panel simultaneous mining of large and thick bodies as claimed in claim 1, 2, 3 or 4, wherein: the step 5) of the bottom-up sectional blasting refers to dividing the ore body on the upper part of the stope into a plurality of sections from bottom to top, wherein the height of each section is 10-15 m, and the ore body on the upper part of the stope is caved in a sectional blasting mode.
6. A new method of mining adapted for multi-stope simultaneous mining of large and thick ore bodies according to claim 5, wherein: only one vein-penetrating transport lane (5) is arranged in each panel area (20), and the vein-penetrating transport lane (5) is located in the center of the junction of the bottoms of the No. 2 stope (17) and the No. 3 stope (18).
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| CN202010950445.1A CN112031770B (en) | 2020-09-11 | 2020-09-11 | Novel mining method suitable for multi-stope synchronous mining of thick and large ore body |
| PCT/CN2021/111867 WO2022052716A1 (en) | 2020-09-11 | 2021-08-10 | Novel ore mining method suitable for multi-stope synchronous mining of large and thick ore body |
| ZA2022/04723A ZA202204723B (en) | 2020-09-11 | 2022-04-28 | New mining method suitable for synchronously mining large and thick ore body with multiple stopes |
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| CN202010950445.1A CN112031770B (en) | 2020-09-11 | 2020-09-11 | Novel mining method suitable for multi-stope synchronous mining of thick and large ore body |
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| CN113216964A (en) * | 2021-05-18 | 2021-08-06 | 中钢集团马鞍山矿山研究总院股份有限公司 | Recovery method of deposit ore in process of transferring caving method to filling method |
| WO2022052716A1 (en) * | 2020-09-11 | 2022-03-17 | 中钢集团马鞍山矿山研究总院股份有限公司 | Novel ore mining method suitable for multi-stope synchronous mining of large and thick ore body |
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| CN115468465A (en) * | 2022-09-28 | 2022-12-13 | 彝良驰宏矿业有限公司 | Blasting method for rapidly forming compensation space without undercutting |
| CN117266856B (en) * | 2023-11-22 | 2024-01-30 | 长春黄金研究院有限公司 | Inclined medium-thickness ore body double-access subsection open stope mining method |
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| CN113216964B (en) * | 2021-05-18 | 2022-05-27 | 中钢集团马鞍山矿山研究总院股份有限公司 | Recovery method of deposit ore in process of transferring caving method to filling method |
Also Published As
| Publication number | Publication date |
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| WO2022052716A1 (en) | 2022-03-17 |
| ZA202204723B (en) | 2022-06-29 |
| CN112031770B (en) | 2022-08-16 |
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