A method of filling mining of medium thickness ore bodies with an inclination between gently inclined and inclined

Abstract

The present application relates to the technical field of underground mining, and particularly relates to a filling mining method for medium-thick ore body with an inclination between gentle inclination and inclination, which comprises the following steps: step one, layout of stope; a caving protection layer is arranged between two ore rooms adjacent in the height direction in the same stage according to a preset thickness; step two, layout of preparation engineering; a through filling communication roadway is arranged in the middle of the interval column and connected to the upper wall of the ore body; and a filling roadway is arranged along the strike of the ore body to the boundary of the ore room at the boundary of the upper wall of the ore body, the filling roadway passes through the filling communication roadway to form a channel for filling the ore room; step three, cutting blasting of the ore room; step four, stoping of the ore room; and step five, filling of the ore room. The caving protection layer is arranged between the adjacent ore rooms, and after blasting of the adjacent ore rooms, the disturbance and damage to the filling body are reduced, so that the filling body mixed with the ore is reduced and the ore dilution is reduced.

Description

Technical Field

[0001] This invention relates to the field of underground mining technology, and in particular to a method for filling and mining medium-thick ore bodies with dip angles between gentle and steep. Background Technology

[0002] Ore bodies with a dip angle between 5-30° are gently dipping, while those with a dip angle between 30-55° are dipping. For medium-thick ore bodies with a dip angle between 20° and 45° and a thickness greater than 10m, the dip angle is relatively small. During mining, the collapsed ore cannot be released naturally by its own weight, resulting in a large loss of ore in the footwall. Shallow-hole mining is often used, which severely restricts the mine's production capacity. This leads to technical problems such as large mining and cutting workload, difficulty in ore transportation, low level of mechanization and low operating efficiency. These ore bodies are recognized as difficult to mine in the field of underground mining technology.

[0003] With the development of modern mining technology and the increasing demands for environmental protection and green mine construction, backfill mining methods have been more widely used. The backfill methods commonly used in mining such deposits are mainly upward horizontal layered backfill or access backfill mining. These methods are highly applicable, but they involve a large amount of preparation work, low production efficiency, and high production costs. Moreover, the ore extraction work is carried out on the backfill body, resulting in a high dilution rate.

[0004] In response to this current technological situation, this invention proposes a filling mining method for medium-thick ore bodies with dip angles between gentle and steep, aiming to solve the problems of low recovery strength and low filling efficiency in the traditional filling mining process of such deposits. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a method for backfilling mining of medium-thick ore bodies with dip angles between gentle dip and inclination, which solves the technical problems of low mining strength and low backfilling efficiency in the traditional backfilling mining process of such deposits.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] A method for backfilling mining of medium-thick ore bodies with dip angles between gently dipping and dipping, the method comprising the following steps:

[0010] Step 1: Mining area layout;

[0011] Along the vertical direction, the ore body is divided into several segments according to the stage height and the stability of the ore body and the surrounding rock. In each segment, a stope is arranged according to a preset size along the strike and dip of the ore body. The height of the stope is the height of two segments.

[0012] Interstitial columns are set between adjacent ore chambers along the strike of the ore body at a predetermined length; stage inclined top columns are set between ore chambers in two adjacent stages at a predetermined thickness; and a caving protection layer is set between two adjacent ore chambers in the same stage along the height direction at a predetermined thickness.

[0013] Step Two: Preparation and Layout of the Survey Project;

[0014] At each segment height, trench drilling roadways and segmented transport roadways are arranged sequentially along the strike of the ore body outside the footwall. A through-passing filling connecting roadway is arranged in the middle of the pillar to connect to the hanging wall of the ore body. At the boundary of the hanging wall, a filling roadway is arranged along the strike of the ore body to the boundary of the stope. The filling roadway passes through the filling connecting roadway to form a passage for filling the stope.

[0015] Step 3: Cut and blast the ore chamber to form a cutting groove;

[0016] Step 4: Mining the aforementioned ore stope;

[0017] Step 5: Fill the ore chamber.

[0018] Several ore-exit tunnels are arranged vertically between the trench drilling tunnel and the segmented transport tunnel to connect the trench drilling tunnel and the segmented transport tunnel.

[0019] The steps for cutting and blasting the ore chamber include:

[0020] Using the ore-exiting vein roadway as a cutting roadway, cutting shafts are arranged along the height direction in the ore-exiting vein roadway so that the cutting shafts pass through the ore stope and connect to the highest point of the ore stope.

[0021] Cutting blast holes are arranged in a fan shape upwards in the ore-exiting vein roadway located on both sides of the cutting shaft. The cutting blast holes pass through the stope and, with the cutting shaft as the blasting free face, are blasted in sequence to form a cutting groove.

[0022] The steps for mining the stope include:

[0023] The stope mining adopts a bottom-up mining sequence, that is, after the stope located in the lower part of the ore body is mined and backfilled, the stope located in the upper part is mined.

[0024] In the rock-drilling tunnels located on both sides of the cutting shaft, a row of mining blast holes is drilled in a fan shape along the rock-drilling tunnels at a preset interval. The cutting groove is used as the free blasting surface. Mining is carried out from the middle of the stope to both ends in a backward mining manner, and the mining blast holes are blasted sequentially from the inside to the outside.

[0025] After blasting, the ore collapses through the blast hole into the trench drilling roadway. A loader is used to scoop and remove the ore through the ore extraction channel. Each time, 20%-30% of the collapsed ore is removed, and the remaining ore is left in the stope to support the hanging wall of the ore body.

[0026] After all the ore has been extracted from the stope, the remaining ore will be mined out and transferred to the next stage via the lower pass.

[0027] The steps for filling the mineral deposit include:

[0028] After the stope is mined out, a filling pipeline is installed from the filling connecting roadway to the filling roadway in the upper section of the stope, and filling retaining walls are installed at both ends of the ore-exiting through roadway and the trench drilling roadway in the current section, and at the junction of the filling roadway in the upper section of the stope and the stope in the current section.

[0029] Step two also includes:

[0030] Inclined connecting roadways are arranged along the strike of the ore body at each segment height, and the inclined connecting roadways are connected to the segment transport roadways;

[0031] A ramp is arranged along the vertical direction between two adjacent sections, the ramp connecting the ramp connecting the upper and lower sections;

[0032] Stage ore passes are arranged at locations far from the footwall of the ore body. One ore pass is arranged every two stops along the height direction, and the ore pass connecting roadways are excavated by the inclined ramp connecting roadways to connect the ore passes.

[0033] The length of the stope is 30-40m, and the width of the stope is equal to the thickness of the ore body.

[0034] The horizontal distance between the trench drilling roadway and the segmented transport roadway is 10-15m to ensure that the loader can load ore in the ore-exiting vein roadway.

[0035] (III) Beneficial Effects

[0036] The beneficial effects of the present invention are as follows: The present invention provides a method for filling and mining medium-thick ore bodies with an inclination angle between gentle inclination and inclination. A 1-2m thick caving protection layer is set between adjacent ore stops. After blasting adjacent ore stops, the disturbance and damage to the filling body is reduced, thereby reducing the mixing of ore into the filling body and reducing ore dilution.

[0037] Using fan-shaped medium-deep holes for ore extraction can reduce extraction costs and increase extraction efficiency and intensity.

[0038] Large-sized stopes are set up along the strike of the ore body, and the mining method of sequential blasting is used to remove only 20%-30% of the ore that collapses each time. The remaining ore in the stopes can support the hanging wall of the ore body, and at the same time, it plays a squeezing role in the next mining blast, thereby improving the ore extraction efficiency.

[0039] By setting up filling roadways and filling connecting roadways in the pillars on both sides of the stope, it is convenient to lay filling pipelines, and the stope can be filled directly from the top of the stope after mining, thus improving filling efficiency. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the stope layout and preparation engineering layout of the medium-thick ore body backfilling mining method of the present invention;

[0041] Figure 2 for Figure 1 Sectional view I-I in the middle;

[0042] Figure 3 for Figure 1 Sectional view II-II in the middle;

[0043] Figure 4 This is a diagram showing the layout of the cut blast holes;

[0044] Figure 5 This is a layout diagram of the blast holes used for mining.

[0045] [Explanation of Labels in the Attached Image]

[0046] 1: Stage transport roadway; 2: Trench drilling roadway; 3: Ore extraction through-vein roadway; 4: Sectional transport roadway; 5: Inclined ramp; 6: Inclined ramp connecting roadway; 7: Pass connecting roadway; 8: Filling connecting roadway; 9: Stage inclined pillar; 10: Filling roadway; 11: Pass; 12: Blast protection layer; 13: Cutting shaft; 14: Stope; 15: Interstitial pillar; 16: Filling body; 17: Filling retaining wall; 18: Cutting blast hole; 19: Mining blast hole; a: Ore body dip; b: Ore body strike; c: Height direction; d: Ore body hanging wall; e: Ore body footwall; f: Blasting sequence. Detailed Implementation

[0047] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] While exemplary embodiments of the invention are shown in the accompanying drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention can be understood more clearly and thoroughly, and that the full scope of the invention can be conveyed to those skilled in the art.

[0049] This invention provides a method for backfilling mining of medium-thick ore bodies with dip angles between gently dipping and dipping, wherein the terms are explained as follows:

[0050] "Ore body dip direction a" refers to the direction of the ore body's dip. See Appendix. Figure 1 and attached Figure 3 The direction of the middle arrow 'a'.

[0051] "Ore body strike b" is perpendicular to "ore body dip a", see appendix. Figure 3 The direction of arrow b in the diagram.

[0052] "The hanging wall of the ore body (d)" refers to the boundary of the inclined surface above which the ore body is located.

[0053] "The lower plate of the ore body (e)" refers to the boundary of the inclined surface below the ore body, which corresponds to "the upper plate of the ore body (d)".

[0054] "Side hole angle" refers to the angle between the outermost blast hole and the horizontal plane.

[0055] "Dilution" refers to the phenomenon where the content of useful minerals in mined ore is lower than that in the ore body, which is caused by the mixing of ore and waste rock during the mining process.

[0056] The explanation of direction in this invention is as follows:

[0057] Height refers to the vertical distance; see appendix. Figure 1 The direction of the middle arrow c is the height direction c.

[0058] Length is the distance along the direction b of the ore body.

[0059] The thickness of the ore body refers to the distance between the hanging wall d and the footwall e of the ore body. The thickness of the stage inclined pillar 9 and the ore collapse protection layer 12 refers to the distance along the dipping direction of the hanging wall d / footwall e of the ore body.

[0060] A method for backfilling mining of medium-thick ore bodies with dip angles between gently dipping and dipping includes the following steps:

[0061] Step 1: Mining area layout;

[0062] See appendix Figure 2Along the height direction c, the height of the ore body is divided into several segments based on the stage height and the stability of the ore body and surrounding rock. The height of each segment is 10-15m. On each segment, a stope 14 is arranged along the ore body strike b. The length of each stope 14 is 30-40m, the width is the thickness of the ore body, and the height of each stope 14 is the height of two segments.

[0063] A column 15 with a length of 10-12m is set between adjacent stopes 14 arranged along the strike b of the ore body. The width of the column 15 is the thickness of the ore body.

[0064] A 6-8m thick inclined roof pillar 9 is left between two adjacent stopes 14. The inclined roof pillar 9 is used to isolate adjacent stops and prevent the backfill material 16 of the already mined and filled stops from collapsing and mixing into the ore when the ore collapses during the mining stage. A 1-2m thick caving protection layer 12 is set between two adjacent stops 14 along the dip a of the ore body in the same stage.

[0065] Step Two: Preparation and Layout of the Survey Project;

[0066] A ramp 5 is arranged along the vertical direction c between two adjacent sections for the up and down passage of personnel, materials and trackless equipment.

[0067] At the height of each segment, along the strike of the ore body (b), a trenching and drilling roadway (2) is arranged on the footwall (e) for drilling, blasting, and ore receiving in the stope. The footwall is the bottom edge of the stope (14).

[0068] A segmented transport roadway 4 is arranged on the outside of each trench drilling roadway 2 along the ore body strike b, with the trench drilling roadway 2 and the segmented transport roadway 4 located at the same height.

[0069] Several ore-exiting tunnels 3 perpendicular to the ore-exiting tunnels 2 and 4 are arranged between the trench drilling tunnel 2 and the segmented transport tunnel 4. The horizontal interval between adjacent ore-exiting tunnels 3 is 6-8 meters.

[0070] The horizontal distance between the trench drilling roadway 2 and the segmented transport roadway 4 is 10-15m, so that the entire body of the loader can load ore in the ore-exiting vein roadway 3.

[0071] A filling connecting roadway 8 is arranged from the segmented transport roadway 4 to the hanging wall d of the ore body in the middle of the column 15. The filling connecting roadway 8 is perpendicular to the segmented transport roadway 4. A filling roadway 10 is arranged along the strike b of the ore body at the boundary of the hanging wall d to the boundary of the stope 14. The filling roadway 10 passes through the filling connecting roadway 8.

[0072] A pass 11 is arranged at a location far from the footwall e of the ore body. One pass 11 is arranged for every two ore rooms 14, and a connecting roadway 7 is excavated from the pass 11 via a ramp connecting roadway 6.

[0073] The stage transport roadway 1 is arranged along the strike b of the ore body on the footwall e of the ore body and is equipped with rails to transport ore within the stage. It connects to the ore pass 11 and is equipped with a ore discharge gate at the connection point. Ore can be put into the mine car and then pulled away by an electric locomotive.

[0074] Step 3: Cutting;

[0075] Using the ore-exiting vein roadway 3 as the cutting roadway, a cutting shaft 13 is arranged along the height direction c in the ore-exiting vein roadway 3, so that the cutting shaft 13 passes through the stope 14 and connects to the highest point of the stope 14.

[0076] Cutting blast holes 18 are arranged in a fan shape upwards in the ore-exiting cross-cutting roadways 3 located on both sides of the cutting shaft 13. The cutting blast holes 18 pass through the stope 14. With the cutting shaft 13 as the free blasting face, the cutting blast holes 18 on both sides of the cutting shaft 13 are blasted outwards in sequence to form cutting grooves. The blasting sequence of the cutting blast holes 18 is shown in the appendix. Figure 4 The direction of the arrow in the image.

[0077] Step 4: Mining stope 14;

[0078] The mining of stope 14 adopts a bottom-up mining sequence. After the mining and backfilling of stope 14 located in the lower part of the ore body are completed, the mining of stope 14 located in the upper part will be carried out.

[0079] In the rock-drilling tunnel 2 located on both sides of the cutting shaft 13, a row of mining blast holes 19 is drilled in a fan shape every 1.8-2.2m along the rock-drilling tunnel 2, with the side hole angle greater than 50°. The cutting groove is used as the blasting free face. Mining is carried out in a retreating manner from the middle of the stope 14 to both ends. Each time, 2-3 rows of mining blast holes 19 are blasted from the inside out.

[0080] Preferably, the mining blast hole 19 adopts a fan-shaped medium-deep hole, which can reduce the cost of ore extraction and increase the efficiency and intensity of ore extraction.

[0081] After blasting, the ore collapses through the blast hole into the rock drilling roadway 2 in the trench. A loader is used to scoop and remove the ore through the ore extraction roadway 3. Only 20%-30% of the ore that collapses each time is transported out. The remaining ore is temporarily left in the stope 14 to support the surrounding rock of the ore body. At the same time, it plays a squeezing role in the mining blasting and improves the blasting effect.

[0082] After all the ore has been extracted from the stope 14, the remaining ore will be released in large quantities at once, and the extracted ore will be slid into the next stage through the lower pass 11.

[0083] Since each stope 14 is mined by pulling outwards from the central cutting groove, if all the collapsed ore is removed after each blast, the central space becomes increasingly larger. In subsequent blasts, the central space is completely empty with no resistance, and the collapsed ore will rush into the mined-out space. The larger the space, the farther the collapsed ore will travel, resulting in a less concentrated ore mass, which is detrimental to subsequent ore extraction. Therefore, by adopting the aforementioned method of retracting stope 14, the dispersion of collapsed ore can be avoided, improving mining efficiency.

[0084] Step 5: Filling of stope 14;

[0085] After the mining of stope 14 is completed, filling pipelines are installed in the filling connecting roadways 8 to 10 in the upper section of stope 14. Filling retaining walls 17 are installed at both ends of the current section's ore-exiting cross-cutting roadway 3 and the trench drilling roadway 2, and at the junction of the filling roadway 10 in the upper section of stope 14 and the current stope 14. The filling retaining walls 17 are filled with cement and tailings with a cement-sand ratio of 1:12.

[0086] This invention provides a method for filling and mining medium-thick ore bodies with an inclination angle between gentle and steep. By setting a 1-2m thick ore-breaking protection layer 12 between adjacent ore chambers 14, the disturbance and damage to the filling body 16 is reduced after the adjacent ore chambers 14 are blasted, thereby reducing the amount of ore mixed into the filling body 16 and reducing ore dilution.

[0087] Using fan-shaped medium-deep holes for ore extraction can reduce extraction costs and increase extraction efficiency and intensity.

[0088] A large stope 14 is set up along the strike b of the ore body. With the sequential blasting mining method, only 20%-30% of the ore that collapses each time is transported out. The remaining ore in the stope 14 can support the surrounding rock of the hanging wall d of the ore body. At the same time, it plays a squeezing role in the next mining blast, thereby improving the ore extraction efficiency.

[0089] By setting up filling roadways 10 and filling connecting roadways 8 in the pillars 15 on both sides of the stope 14, it is convenient to install filling pipelines, and the stope 14 can be filled directly from the top of the stope 14 after mining, which improves the filling efficiency.

[0090] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0092] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, characterized in that, The medium-thickness ore body backfilling mining method includes the following steps: Step 1: Mining area layout; Along the height direction (c), the ore body is divided into several segments according to the stage height and the stability of the ore body and the surrounding rock. In each segment, a stope (14) is arranged according to a preset size along the ore body strike (b) and ore body dip (a). The height of the stope (14) is the height of two segments. Along the strike of the ore body (b), adjacent ore houses (14) are provided with inter-column columns (15) of a preset length; between two adjacent ore houses (14) of a preset thickness, stage inclined top columns (9) are provided; between two adjacent ore houses (14) of the same stage along the height direction (c), a caving protection layer (12) is provided with a preset thickness. Step Two: Preparation and Layout of the Survey Project; At each segment height, a trenching tunnel (2) and a segmented transport tunnel (4) are arranged sequentially along the strike (b) of the ore body outside the footwall (e) of the ore body; a through filling connecting tunnel (8) is arranged in the middle of the inter-pillar (15) to connect to the footwall (d) of the ore body; and a filling tunnel (10) is arranged along the strike (b) of the ore body at the boundary of the footwall (d) of the ore body to the boundary of the stope (14), the filling tunnel (10) passes through the filling connecting tunnel (8) to form a passage for filling the stope (14); Step 3: Cut and blast the ore chamber (14) to form a cutting groove; Step 4: Mining the stope (14); The mining is carried out in a bottom-up sequence, retreating from the middle of the stope to both ends. After each blast, only 20%-30% of the collapsed ore is removed, and the remaining ore is left in the stope to support the hanging wall and serve as the compression medium for subsequent blasts. Step 5: Fill the ore chamber (14).

2. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 1, is characterized in that... Several ore-exiting tunnels (3) are arranged vertically between the trench drilling tunnel (2) and the segmented transport tunnel (4) to connect the trench drilling tunnel (2) and the segmented transport tunnel (4).

3. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 2, is characterized in that... The steps of cutting and blasting the ore chamber (14) include: Using the ore-exiting vein roadway (3) as a cutting roadway, a cutting shaft (13) is arranged along the height direction (c) in the ore-exiting vein roadway (3) so that the cutting shaft (13) passes through the ore chamber (14) and connects to the highest point of the ore chamber (14). Cutting blast holes (18) are arranged in a fan shape upward in the ore-exiting vein roadway (3) located on both sides of the cutting shaft (13). The cutting blast holes (18) pass through the ore chamber (14) and the cutting shaft (13) is used as the blasting free surface to form a cutting groove by blasting in sequence.

4. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 3, is characterized in that... The steps for mining the stope (14) include: After the mining and backfilling of the stope (14) located in the lower part of the ore body is completed, the stope (14) located in the upper part will be mined again. In the trench drilling roadway (2) located on both sides of the cutting well (13), a row of mining blast holes (19) is drilled in a fan shape along the trench drilling roadway (2) at a preset interval. The cutting groove is used as the blasting free surface, and the mining blast holes (19) are blasted sequentially from the inside to the outside.

5. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 4, is characterized in that... After blasting, the ore falls through the blast hole into the trench rock drilling roadway (2), and is loaded and discharged by a loader through the ore extraction channel (3).

6. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 5, is characterized in that... After all the ore has been extracted from the mine (14), the remaining ore is extracted and slid into the next stage through the lower ore pass (11).

7. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 2, is characterized in that... The steps for filling the stope (14) include: After the mining of the stope (14) is completed, a filling pipeline is installed from the filling connecting roadway (8) to the filling roadway (10) in the upper section of the stope (14), and a filling retaining wall (17) is installed at both ends of the ore-exiting through roadway (3) and the trench drilling roadway (2) in the current section, and at the junction of the filling roadway (10) in the upper section of the stope (14) and the stope (14) in the current section.

8. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 1, is characterized in that... Step two also includes: Inclined connecting roadways (6) are arranged along the strike (b) of the ore body at each segment height, and the inclined connecting roadways (6) are connected to the segment transport roadways (4); A ramp (5) is arranged along the height direction (c) between two adjacent segments, the ramp (5) connecting the ramp connecting roadway (6) of the upper and lower segments. Stage chutes (11) are arranged at a location away from the footwall (e) of the ore body. A chute (11) is arranged at a height of every two of the ore houses (14) along the height direction (c), and a chute connecting roadway (7) is excavated by the ramp connecting roadway (6) to connect the chutes (11).

9. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 1, is characterized in that... The length of the ore chamber (14) is 30-40m, and the width of the ore chamber (14) is the thickness of the ore body.

10. The method for backfilling and mining medium-thick ore bodies with dip angles between gently dipping and dipping, as described in claim 2, is characterized in that... The horizontal distance between the trench drilling roadway (2) and the segmented transport roadway (4) is 10-15m, so that the body of the loader can load ore in the ore-exiting vein roadway (3).

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