Blast hole arrangement method for steeply inclined thin vein
By arranging the mining lines at intervals along the extension direction of the ore veins in the sharply inclined thin ore veins and setting the gun holes in the misaligned direction, the problems of harsh environment, safety and low production efficiency in ore veins mining are solved, and more efficient blasting effect and lower ore depletion rate are achieved.
Patent Information
- Application Number
- CN202510335721.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-05-23
AI Technical Summary
In the mining of sharp inclined thin ore veins, the existing mining methods have problems such as harsh operating environment, safety and low production efficiency. Due to the complex and changeable thickness of the ore veins, the waste rocks are mixed and the ore is not exploded, which increases the challenge of depletion rate and recovery rate.
A method of setting up a gun hole is adopted, which includes setting up cutting wells at one end edge of the extension direction of the ore vein, laying the retrieval line at intervals along the extension direction of the ore vein, and setting up a gun hole on each retrieval line. Among any two adjacent retrieval line, the gun hole on one retrieval line is arranged in a misalignment with the gun hole on the other retrieval line.
Through this method of setting up the gun hole, the blasting effect of the sharply tilted thin ore veins can be effectively improved, while reducing the ore depletion rate and improving the recovery rate.
Smart Images
Figure CN120027668A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of mineral vein blasting, and in particular to a blasthole arrangement method for steeply inclined thin mineral veins. Background Art
[0002] In the mining of steeply inclined thin veins in domestic gold mines, shallow hole mining methods and wall cutting and filling mining methods are often used, which have problems such as poor working environment, safety and low production efficiency. When the above mining methods are used for recovery blasting, due to the special ore body conditions of steeply inclined thin veins, the thickness of the veins is often complex and changeable, and there may be great changes in local areas, such as sudden thickening or thinning of the veins. In this way, due to the special ore and rock conditions of steeply inclined thin veins, the mining width of the stope is difficult to effectively control. It may cause waste rock to mix in, resulting in an increase in the depletion rate, or the ore may not be exploded, resulting in a decrease in the recovery rate. Summary of the invention
[0003] The object of the present disclosure is to provide a blasthole arrangement method for steeply inclined thin ore veins, so as to reduce the ore depletion rate while improving the blasting effect of the steeply inclined thin ore veins.
[0004] In order to achieve the above object, the present disclosure provides a blasthole arrangement method for steeply inclined thin ore veins, the blasthole arrangement method comprising: A cutting well is arranged at one end edge of the extending direction of the ore vein; Arrange multiple mining lines at intervals along the extension direction of the ore vein, wherein the edge of the ore vein is located on the mining lines; Blast holes are arranged on each mining line, wherein, in any two adjacent mining lines, the blast holes on one mining line are staggered with the blast holes on the other mining line.
[0005] Optionally, in the step of setting a blasthole on each recovery line, the length l of the recovery line is i for l a ≤l i ≤l b , the blasthole arrangement method comprises: The length of the mining line l i >l c When the mining line is used, at least two blast holes are arranged at intervals; The length of the mining line l i ≤l c When the mining line is at least provided with one blast hole, a <l c <l b .
[0006] Optionally, in two adjacent recovery lines, if the length of the recovery line close to the cutting well is l i >l c , the blasthole arrangement method comprises: Three blast holes are arranged at intervals on the recovery line near the cutting well, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the recovery line; or Two blast holes are arranged at intervals in the middle of the recovery line close to the cutting well.
[0007] Optionally, in the step of arranging three blastholes at intervals on the recovery line close to the cutting well, wherein two blastholes are arranged at the edges of both ends respectively, and another blasthole is arranged in the middle area of the recovery line, the blasthole arrangement method includes: If the length of the other mining line is l i >l c , then two blast holes are set at intervals in the middle position of the other mining line; If the length of the other mining line is l i ≤l c , a blast hole is respectively set at the two end edges of the other mining line.
[0008] Optionally, in the step of arranging two blastholes at intervals at a middle position of the recovery line close to the cutting well, the blasthole arrangement method includes: If the length of the other mining line is l i >l c , then three blast holes are arranged at intervals on the other mining line, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the mining line; If the length of the other mining line is l i ≤l c , a blast hole is respectively set at the two end edges of the other mining line.
[0009] Optionally, in two adjacent recovery lines, if the length of the recovery line far away from the cutting well is l i >l c And the length of the other mining line l i ≤l c , the blasthole arrangement method comprises: Three blast holes are arranged at intervals on the recovery line away from the cutting well, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the recovery line; A blast hole is respectively set at the two end edges of another mining line.
[0010] Optionally, in two adjacent mining lines, both mining lines have a length of l i ≤l c When the blasthole arrangement method comprises: If the length of the recovery line near the cutting well is l i >l a , a blast hole is respectively set at the two end edges of the recovery line close to the cutting well; or A blast hole is arranged at a middle position of the recovery line near the cutting well; If the length of the recovery line near the cutting well is l i = l a , a blast hole is set at the edge of one end of the recovery line close to the cutting well.
[0011] Optionally, the length l of the recovery line close to the cutting well i = l a , in the step of setting a blasthole at one end edge of the mining line, the blasthole arrangement method includes: If the length of the other mining line is l i >l a , a blast hole is respectively set at the two end edges of the other mining line; If the length of the other mining line is l i = l a , a blast hole is set at the edge of one end of the other mining line, and the setting position of the blast hole is located on the opposite side of the blast hole of the adjacent mining line.
[0012] Optionally, in the step of respectively arranging a blasthole at both end edges of the recovery line close to the cutting well, the blasthole arrangement method includes: If the length of the other mining line is l i >l a , a blast hole is set at the middle position of the other mining line; If the length of the other mining line is l i = l a , a blast hole is set at the edge of one end of the other mining line.
[0013] Optionally, in the step of setting a blasthole at a middle position of the recovery line close to the cutting well, the blasthole arrangement method includes: A blast hole is respectively set at the two end edges of another mining line.
[0014] Optionally, in the step of arranging a plurality of mining lines at intervals along the extension direction of the ore vein, if the distance s between the two end boundaries of the ore vein corresponding to the extension direction of the mining lines is less than la , then the length of the mining line l i =l a ; If the distance s between the two ends of the vein corresponding to the extension direction of the mining line is ≥ l a , then the length of the mining line is equal to the distance between the two end boundaries of the corresponding vein.
[0015] Optionally, in the step of arranging a plurality of mining lines at intervals along the extension direction of the ore vein, two adjacent mining lines are arranged in parallel.
[0016] Through the above technical scheme, mining lines are arranged at intervals along the extension direction of the ore vein, and blastholes are set on the mining lines. In any two adjacent mining lines, the blastholes on one mining line are staggered with the blastholes on the other mining line, thereby ensuring compensation space for the blastholes on the mining line away from the cutting well side in the two adjacent mining lines, which can effectively improve the blasting effect and reduce the ore depletion rate.
[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a schematic diagram of blasthole arrangement in a blasthole arrangement method for steeply inclined thin veins according to an embodiment of the present disclosure.
[0019] Figure 2 The distance s≥l between the two end boundaries of the vein in the blasthole arrangement method for steeply inclined thin veins according to one embodiment of the present disclosure a Schematic diagram of the blasthole arrangement.
[0020] Figure 3 It is a schematic diagram of the blasthole arrangement of two adjacent mining lines in the blasthole arrangement method for steeply inclined thin veins according to the first embodiment of the present disclosure.
[0021] Figure 4 It is a schematic diagram of the blasthole arrangement of two adjacent mining lines in the blasthole arrangement method for steeply inclined thin veins according to the second embodiment of the present disclosure.
[0022] Figure 5 It is a schematic diagram of the blasthole arrangement of two adjacent mining lines in the blasthole arrangement method for steeply inclined thin veins according to the third embodiment of the present disclosure.
[0023] Figure 6 It is a schematic diagram of the blasthole arrangement of two adjacent mining lines in the blasthole arrangement method for steeply inclined thin veins according to the fourth embodiment of the present disclosure.
[0024] Figure 7 It is a schematic diagram of the blasthole arrangement of two adjacent mining lines in the blasthole arrangement method for steeply inclined thin veins according to the fifth embodiment of the present disclosure.
[0025] Description of Reference Numerals 1- cutting well; 2- ore vein; 3- mining line; 4- blast hole. DETAILED DESCRIPTION
[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.
[0027] According to one embodiment of the present disclosure, Figures 1 to 6 As shown, a blasthole arrangement method for steeply inclined thin veins is provided, and the blasthole arrangement method includes the following steps: firstly, a cutting well 1 is arranged at one end edge of the extension direction of the vein 2, and a plurality of mining lines 3 are arranged at intervals along the extension direction of the vein 2, wherein the edge of the vein 2 is located on the mining line 3. Then, a blasthole 4 is arranged on each mining line 3, wherein, in any two adjacent mining lines 3, the blasthole 4 on one mining line 3 is staggered with the blasthole 4 on the other mining line 3.
[0028] Through the above technical scheme, the mining lines 3 are arranged at intervals along the extension direction of the ore vein 2, and blastholes 4 are set on the mining lines 3. In any two adjacent mining lines 3, the blastholes 4 on one mining line 3 are staggered with the blastholes 4 on the other mining line 3, so as to ensure the compensation space of the blastholes 4 on the mining line 3 far away from the side of the cutting well 1 in the two adjacent mining lines 3, which can effectively improve the blasting effect and reduce the ore depletion rate.
[0029] It should be noted that a steeply inclined thin ore vein refers to an ore vein with an ore body inclination angle greater than 45° and a relatively small ore body thickness. Therefore, the steeply inclined thin ore vein generally extends in the height direction, and the extension direction of the ore vein 2 mentioned here refers to its extension direction in the height direction. In the step of setting a plurality of recovery lines 3 at intervals along the extension direction of the ore vein 2, two adjacent recovery lines 3 can be arranged in parallel, so that the blast holes 4 can be arranged more evenly to improve the blasting effect. The distance between two adjacent recovery lines 3 can be set according to the blasting requirements, and the distance between any two recovery lines 3 can be equal or unequal, and the present disclosure does not limit this.
[0030] Further, in the step of setting a blasthole 4 on each recovery line 3, as Figures 2 to 7 As shown, the length l of the mining line 3 i Can be l a ≤l i ≤l b The number of blastholes 4 on each mining line 3 can be set according to the length of the mining line 3. Specifically, the blasthole arrangement method may include the following steps: i >l c When the length of the mining line 3 is l, at least two blast holes 4 are arranged at intervals. i ≤l c When the mining line 3 is used, at least one blast hole 4 is provided, wherein l a <l c <l b In this way, when the length of the mining line 3 exceeds, at least one blast hole 4 can be added to improve the blasting effect, reduce the probability of unexploded ore, and improve the recovery rate. a , l b and l c Settings, l a Can be set to 1.2m, l b Can be set to 2.0m, l c It can be set to 3.0m, or it can be set to other values according to needs, which is not limited in the present disclosure.
[0031] Take the length l of the mining line 3 i for l a ≤l i ≤l b For example, Figure 2 As shown, in the step of arranging a plurality of mining lines 3 at intervals along the extension direction of the ore vein 2, if the distance s between the two end boundaries of the corresponding ore vein 2 in the extension direction of the mining lines 3 is less than l a , the ore vein 2 here is too thin, but blasting is still required. Therefore, in order to facilitate the design of the subsequent mining line 3, the length of the mining line 3 here is l i =l a , at this time, at least one end of the boundary of the mining line 3 is located outside the ore vein 2. If the distance s between the two ends of the corresponding ore vein 2 in the extension direction of the mining line 3 is ≥ l a , then the length of the mining line 3 is equal to the distance between the two end boundaries of the corresponding vein 2, that is, the two ends of the mining line 3 are connected to the two end boundaries of the vein 2. The inclination angle of the mining line 3 can be set according to the inclination angle of the vein 2, the thickness of the vein 2 and the extension direction, and the present disclosure does not limit this.
[0032] Furthermore, if Figures 3 to 5As shown, in two adjacent mining lines 3, both mining lines 3 have a length of l i ≤l c When the blasthole arrangement method may include the following steps, specifically, if the length l of the recovery line 3 close to the cutting well 1 is i = l a , a blast hole 4 is set at one end edge of the recovery line 3 close to the cutting well 1. The length l of the recovery line 3 i = l a When the length of the mining line 3 is small, the ore vein 2 corresponding to this position is thin. Therefore, setting a blast hole 4 at the edge of the mining line 3 can ensure the blasting effect. i >l a At this time, the mining line 3 has a certain length. In order to improve the recovery rate of the ore, a blasthole 4 can be set at the edges of both ends of the mining line 3 close to the cutting well 1, or a blasthole 4 can be set in the middle position of the mining line 3 close to the cutting well 1 to increase the blasting probability of the ore near the mining line 3.
[0033] Specifically, the two recovery lines 3 are both of length l i ≤l c When Figure 3 As shown, if the length of the recovery line 3 near the cutting well 1 is l i = l a , then a blasthole 4 is set at one end edge of the mining line 3. At this time, if the length of the other mining line 3 is l i = l a , then a blast hole 4 is set at one end edge of the other mining line 3, and the blast hole 4 is set at the opposite side of the blast hole 4 of the adjacent mining line 3. In this way, since the lengths of the two mining lines 3 are relatively small, the single blast holes 4 on the two mining lines 3 are staggered, which can ensure the blasting effect of the ore between the two adjacent mining lines 3. If the length of the other mining line 3 is l i >l a , a blast hole 4 is respectively set at the two end edges of another recovery line 3 to increase the blasting probability of the ore near the recovery line 3 and reduce the occurrence of the ore not being exploded.
[0034] The two mining lines 3 are both of length l i ≤l c When Figure 4 As shown, if the length of the recovery line 3 near the cutting well 1 is l i >l a , and a blast hole 4 is set at each end edge of the recovery line 3 close to the cutting well 1. At this time, if the length of the other recovery line 3 is l i >la , then a blast hole 4 is set in the middle of the other mining line 3. In this way, the blast holes 4 on the two adjacent mining lines 3 are arranged in a triangle, which can ensure the blasting probability at the edge and the middle of the corresponding position of the vein 2. i = l a Since the ore body between two adjacent mining lines 3 gradually becomes thinner, a blasthole 4 is provided at the edge of one end of another mining line 3 to ensure the blasting effect of the ore between the two mining lines 3.
[0035] The two mining lines 3 are both of length l i ≤l c When Figure 5 As shown, if the length of the recovery line 3 near the cutting well 1 is l i >l a , and a blast hole 4 is set in the middle of the recovery line 3 close to the cutting well 1. At this time, in order to ensure the compensation space of the blast hole 4 on the recovery line 3 far away from the cutting well 1, no matter the length l of the other recovery line 3 i Is it equal to l a The blasthole arrangement of the other mining line 3 is that a blasthole 4 is respectively set at the two end edges of the other mining line 3.
[0036] According to one embodiment of the present disclosure, Figures 3 to 5 As shown, in two adjacent recovery lines 3, if the length of the recovery line 3 far away from the cutting well 1 is l i >l c And the length of the other mining line 3 is l i ≤l c When the length of the mining line 3 near the cutting well 1 is l, three blast holes 4 can be set at intervals on the mining line 3 far away from the cutting well 1, two of which are set at the edges of both ends, another blast hole 4 is set in the middle area of the mining line 3, and one blast hole 4 is set at the edges of both ends of the other mining line 3 (the mining line 3 near the cutting well 1). i = l a , although when the ore body thickness changes slightly, it can be i = l a Only one blast hole 4 is set on the mining line 3, but the length of the other mining line is l i >l cAt this time, since the difference in length of the two mining lines 3 is too large, it means that the thickness of the ore body changes too much in a short distance. Therefore, in order to ensure the compensation space of the blasthole 4 of the mining line 3 far away from the cutting well 1, even if the length of the mining line 3 close to the cutting well 1 is shorter, a blasthole 4 is required to be set at the edges of both ends of the mining line 3 close to the cutting well 1 to improve the blasting effect.
[0037] According to one embodiment of the present disclosure, Figure 6 and Figure 7 As shown, among the two adjacent recovery lines 3, if the length of the recovery line 3 close to the cutting well 1 is l i >l c The blasthole arrangement method may include the following steps. Specifically, since the length of the mining line 3 is relatively long at this time, the thickness of the ore vein 2 corresponding to this position is relatively thick. Three blastholes 4 can be arranged at intervals on the mining line 3 near the cutting well 1, wherein two blastholes 4 are arranged at the edges of both ends respectively, and the other blasthole 4 is arranged in the middle area of the mining line 3, or two blastholes 4 are arranged at intervals in the middle position of the mining line 3 near the cutting well 1, so as to ensure the blasting effect of the ore near the mining line 3.
[0038] Furthermore, if Figure 6 As shown, if three blast holes 4 are arranged at intervals on the mining line 3 near the cutting well 1, and two of the blast holes 4 are arranged at the edges of both ends, and the other blast hole 4 is arranged in the middle area of the mining line 3. At this time, if the length of the other mining line 3 is l i >l c , then two blast holes 4 are set at intervals in the middle of the other mining line 3. In this way, the blast holes 4 on the two adjacent mining lines 3 are arranged in a trapezoidal shape, which can ensure the blasting probability at the edge and the middle of the corresponding position of the vein 2. If the length of the other mining line 3 is l i ≤l c , then a blast hole 4 is set at the edge of both ends of the other mining line 3. At this time, since the length difference between the two mining lines 3 is too large, the thickness of the ore body changes too much in a short distance. Therefore, in order to ensure the compensation space of the blast hole 4 of the mining line 3 close to the cutting well 1, even if the length of the other mining line 3 is shorter, a blast hole 4 is required to be set at the edge of both ends of the other mining line 3 to improve the blasting effect.
[0039] If two blast holes 4 are arranged at intervals in the middle of the recovery line 3 near the cutting well 1, as shown in FIG. Figure 7 As shown, if the length of another mining line 3 is l i >l c, then three blastholes 4 are arranged at intervals on the other mining line 3, two of which are arranged at the edges of both ends, and the other blasthole 4 is arranged in the middle area of the mining line 3. If the length of the other mining line 3 is l i ≤l c , then a blast hole 4 is respectively set at the edge of both ends of the other mining line 3. At this time, in order to ensure the compensation space of the blast hole 4 of the mining line 3 close to the cutting well 1, even if the length of the other mining line 3 is shorter, a blast hole 4 is required to be set at the edge of both ends of the other mining line 3 to improve the blasting effect.
[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.
[0042] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.
Claims
1. A method for arranging blastholes for steeply inclined thin ore veins, characterized in that: The blasthole arrangement method comprises: A cutting well is arranged at one end edge of the extending direction of the ore vein; Arrange multiple mining lines at intervals along the extension direction of the ore vein, wherein the edge of the ore vein is located on the mining lines; Blast holes are arranged on each mining line, wherein, in any two adjacent mining lines, the blast holes on one mining line are staggered with the blast holes on the other mining line.
2. The method for arranging blastholes for steeply inclined thin ore veins according to claim 1, characterized in that: In the step of setting a blasthole on each recovery line, the length of the recovery line is l i for l a ≤l i ≤l b , the blasthole arrangement method comprises: The length of the mining line l i >l c When the mining line is used, at least two blast holes are arranged at intervals; The length of the mining line l i ≤l c When the mining line is at least provided with one blast hole, a <l c <l b .
3. The method for arranging blastholes for steeply inclined thin ore veins according to claim 2, characterized in that: In two adjacent production lines, if the length of the production line close to the cutting well is l i >l c , the blasthole arrangement method comprises: Three blast holes are arranged at intervals on the recovery line near the cutting well, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the recovery line; or Two blast holes are arranged at intervals in the middle of the recovery line close to the cutting well.
4. The method for arranging blastholes for steeply inclined thin ore veins according to claim 3, characterized in that: In the step of arranging three blast holes at intervals on the recovery line near the cutting well, wherein two blast holes are arranged at the edges of both ends respectively, and another blast hole is arranged in the middle area of the recovery line, the blast hole arrangement method includes: If the length of the other mining line is l i >l c , then two blast holes are set at intervals in the middle position of the other mining line; If the length of the other mining line is l i ≤l c , a blast hole is respectively set at the two end edges of the other mining line.
5. The method for arranging blastholes for steeply inclined thin ore veins according to claim 3, characterized in that: In the step of arranging two blast holes at intervals in the middle position of the recovery line close to the cutting well, the blast hole arrangement method includes: If the length of the other mining line is l i >l c , then three blast holes are arranged at intervals on the other mining line, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the mining line; If the length of the other mining line is l i ≤l c , a blast hole is respectively set at the two end edges of the other mining line.
6. The method for arranging blastholes for steeply inclined thin ore veins according to claim 2, characterized in that: In two adjacent recovery lines, if the length of the recovery line far away from the cutting well is l i >l c And the length of the other mining line l i ≤l c , the blasthole arrangement method comprises: Three blast holes are arranged at intervals on the recovery line away from the cutting well, two of which are arranged at the edges of both ends, and the other blast hole is arranged in the middle area of the recovery line; A blast hole is respectively set at the two end edges of another mining line.
7. The method for arranging blastholes for steeply inclined thin ore veins according to claim 2, characterized in that: In two adjacent mining lines, both mining lines have a length of l i ≤l c When the blasthole arrangement method comprises: If the length of the recovery line near the cutting well is l i >l a , a blast hole is respectively set at the two end edges of the recovery line close to the cutting well; or A blast hole is arranged at a middle position of the recovery line near the cutting well; If the length of the recovery line near the cutting well is l i = l a , a blast hole is set at the edge of one end of the recovery line close to the cutting well.
8. The method for arranging blastholes for steeply inclined thin ore veins according to claim 7, characterized in that: In the case where the length of the recovery line near the cutting well is l i = l a , in the step of setting a blasthole at one end edge of the mining line, the blasthole arrangement method includes: If the length of the other mining line is l i >l a , a blast hole is respectively set at the two end edges of the other mining line; If the length of the other mining line is l i = l a , a blast hole is set at the edge of one end of the other mining line, and the setting position of the blast hole is located on the opposite side of the blast hole of the adjacent mining line.
9. The method for arranging blastholes for steeply inclined thin ore veins according to claim 7, characterized in that: In the step of respectively arranging a blasthole at the two end edges of the recovery line close to the cutting well, the blasthole arrangement method includes: If the length of the other mining line is l i >l a , a blasthole is set at the middle position of the other mining line; If the length of the other mining line is l i = l a , a blast hole is set at the edge of one end of the other mining line.
10. The method for arranging blastholes for steeply inclined thin ore veins according to claim 7, characterized in that: In the step of setting a blasthole at a middle position of the recovery line close to the cutting well, the blasthole arrangement method includes: A blast hole is respectively set at the two end edges of another mining line.
11. The method for arranging blastholes for steeply inclined thin ore veins according to claim 1, characterized in that: In the step of arranging a plurality of mining lines at intervals along the extension direction of the ore vein, if the distance s between the two end boundaries of the ore vein corresponding to the extension direction of the mining lines is less than l a , then the length of the mining line l i =l a ; If the distance s between the two ends of the vein corresponding to the extension direction of the mining line is ≥ l a , then the length of the mining line is equal to the distance between the two end boundaries of the corresponding vein.
12. The method for arranging blastholes for steeply inclined thin ore veins according to claim 1, characterized in that: In the step of arranging a plurality of mining lines at intervals along the extension direction of the ore vein, two adjacent mining lines are arranged in parallel.