Efficient mining method for upper and lower wall triangular ore of inclined thick and large ore body

Abstract

The invention discloses an efficient mining method for a hanging-wall and footwall triangular mine of an inclined thick and large ore body, which is characterized in that the hanging-wall and footwall triangular mine is mined after the inclined thick and large ore body is stoped by a room method in a medium-length hole stage, and the method comprises the steps of hanging-wall downward pre-splitting groove pulling, footwall upward pre-splitting groove pulling, hanging-wall triangular mine separate mining, footwall waste rock separate mining and footwall triangular mine stoping. According to the method, a pre-splitting deep hole is constructed in an ore-rock interface of the hanging-and-footwall triangular ore through a medium-length hole drill jumbo, and a cutting groove is formed in the ore-rock interface through blasting in advance, so that the hanging-and-footwall triangular ore of the inclined thick and large ore body can be stoped continuously through a medium-length hole stage room method; therefore, the stoping efficiency can be greatly improved, the accurate mining work amount is reduced, the filling process is simplified, the production cost is reduced, serious ore loss and dilution caused by ore-rock mixed mining can be effectively avoided, and the outlet grade of ore is improved. The method has the advantages of being high in stoping efficiency, small in mining preparation work amount, simple in filling process, low in production cost, low in loss and dilution and the like.

Description

Technical Field

[0001] The invention relates to a mining method, in particular to a high-efficiency mining method for triangular ore in the upper and lower plates of an inclined thick ore body. Background Art

[0002] The staged chamber method of medium-deep holes is the mainstream mining method for mining inclined thick ore bodies, but when used for mining the upper and lower triangular ore, it will cause serious ore loss and dilution due to the mixed mining of ore and rock. If the upward horizontal layered filling method is used to mine the upper and lower triangular ore, although it can effectively reduce the loss and dilution of ore, it is necessary to add mining and preparation projects such as segmented level tunnels, layered connecting roads, and chute shafts, and the shallow hole mining efficiency is low, the filling process is complex, and the mining cost increases. It can be seen that the existing mining process of the upper and lower triangular ore of inclined thick ore bodies has problems such as low mining efficiency, large mining and preparation engineering, complex filling process, high production cost, and serious loss and dilution. Therefore, how to make full use of the existing mining and preparation projects of the staged chamber method, adopt the medium-deep hole mining process to separate ore and rock, and realize the efficient and low-loss mining of the upper and lower triangular ore has become a problem that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an efficient mining method for triangular ore in the upper and lower plates of an inclined thick ore body with high recovery efficiency.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: after mining the inclined thick ore body by the medium-deep hole stage chamber method, the triangular ore of the upper and lower plates is mined, including the following steps: 1) downward pre-splitting grooves in the upper plate: using the upper stage rock drilling tunnel formed by the medium-deep hole stage chamber method, along the upper plate ore-rock interface, a row of downward pre-splitting deep holes are constructed by a medium-deep hole drilling trolley, and pre-blasting forms the upper plate cutting grooves; 2) Pre-splitting grooves in the lower plate: Using the lower stage mine exit tunnel formed by the medium-deep hole stage mine room method, a row of upward pre-splitting deep holes are constructed along the lower plate ore-rock interface using a medium-deep hole drilling trolley, and pre-blasting is performed to form the lower plate cutting grooves; 3) Mining the triangular ore in the upper plate: construct an upper plate mining tunnel at the bottom of the triangular ore in the upper plate, use a medium-deep hole drilling rig to construct an upward fan-shaped medium-deep hole, and then use the upper plate cutting groove formed in step 1) to realize the mining of the triangular ore in the upper plate, and transport the ore out from the upper plate mining tunnel; 4) Mining waste rock from the lower plate: construct a lower plate mining tunnel at the bottom of the lower plate triangular ore, use a medium-deep hole drilling rig to construct upward fan-shaped medium-deep holes, and use the lower plate cutting groove formed in step 2) to achieve efficient mining of waste rock from the lower plate, and transport the waste rock out from the lower plate mining tunnel; 5) Mining of the lower plate triangle ore: construct a lower plate drilling tunnel at the top of the lower plate triangle ore, use a medium-deep hole drilling rig to construct downward fan-shaped medium-deep holes, collapse the lower plate triangle ore to the lower plate mining tunnel at the bottom, and transport the ore out.

[0005] Furthermore, the following step is included: the goaf area of ​​the lower plate is subsequently filled: a filling pipeline is set up from the lower plate rock drilling tunnel at the top of the lower plate triangular mine, and the goaf area generated by the lower plate triangular mine and waste rock mining is subsequently filled.

[0006] Furthermore, in step 4), the waste rock is transported out and backfilled into the goaf created by mining the upper triangle mine.

[0007] The beneficial effect of adopting the above technical scheme is that the present invention uses a medium-deep hole drilling trolley to construct a pre-splitting deep hole at the ore-rock interface of the upper and lower plate triangular ore, and blasts a cutting groove in advance at the ore-rock interface, so that the medium-deep hole stage mine room method can continue to be used to recover the upper and lower plate triangular ore of the inclined thick ore body, thereby greatly improving the recovery efficiency, reducing the amount of mining engineering, simplifying the filling process, and reducing production costs. It can also effectively avoid serious ore loss and dilution caused by mixed mining of ore and rock, and improve the grade of the ore. The present invention has the advantages of high recovery efficiency, small amount of mining engineering, simple filling process, low production cost and loss dilution. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0009] Figure 1 It is a schematic diagram of the mining structure of steps 1) and 2) of the present invention; Figure 2 It is a schematic diagram of the mining structure of step 3) of the present invention; Figure 3 It is a schematic diagram of the mining structure of steps 4) and 5) of the present invention; Figure 4 It is a schematic diagram of the mining structure of step 6) of the present invention.

[0010] In the figure: 1—upper stage rock drilling tunnel; 2—upper wall cutting groove; 3—lower stage mining tunnel; 4—lower wall cutting groove; 5—upper wall mining tunnel; 6—lower wall mining tunnel; 7—waste rock; 8—lower wall rock drilling tunnel; 9—subsequent filling body. DETAILED DESCRIPTION

[0011] The efficient mining method of the upper and lower triangular ore of the inclined thick ore body is to use the medium-deep hole mining process to mine the upper and lower triangular ore after the inclined thick ore body is mined by the mine room method in the medium-deep hole stage, and includes the following steps: 1) Upward pre-splitting and slotting of the hanging wall: Using the upper-stage drilling roadway 1 formed by the medium-deep hole shrinkage method, along the hanging wall ore-rock interface, a row of downward pre-splitting deep holes are constructed using a medium-deep hole drilling jumbo, and the hanging wall cutting slot 2 is formed by pre-blasting, as shown in Figure 1 ; the depth of the hanging wall cutting slot 2 should penetrate from the upper-stage drilling roadway 1 to the boundary of the hanging wall triangular ore, and the width should reach 0.5 m or more.

[0012] 2) Downward pre-splitting and slotting of the footwall: Using the lower-stage ore-drawing roadway 3 formed by the medium-deep hole shrinkage method, along the footwall ore-rock interface, a row of upward pre-splitting deep holes are constructed using a medium-deep hole drilling jumbo, and the footwall cutting slot 4 is formed by pre-blasting, as shown in Figure 1 ; the depth of the footwall cutting slot 4 should penetrate from the lower-stage ore-drawing roadway 3 to the boundary of the footwall triangular ore, and the width should reach 0.5 m or more.

[0013] 3) Selective mining of the hanging wall triangular ore: The hanging wall ore-drawing roadway 5 is constructed at the bottom of the hanging wall triangular ore, and upward fan-shaped medium-deep holes are constructed using a medium-deep hole drilling jumbo. Utilizing the hanging wall cutting slot 2 formed by pre-blasting, efficient selective mining of the hanging wall triangular ore is achieved, and the ore is transported out from the hanging wall ore-drawing roadway 5 by a LHD, as shown in Figure 2 ; as shown.

[0014] 4) Selective mining of the footwall waste rock: The footwall ore-drawing roadway 6 is constructed at the bottom of the footwall triangular ore, and upward fan-shaped medium-deep holes are constructed using a medium-deep hole drilling jumbo. Utilizing the footwall cutting slot 4 formed by pre-blasting, efficient selective mining of the footwall waste rock is achieved, and the waste rock 7 is transported out from the footwall ore-drawing roadway 6 by a LHD and backfilled into the goaf generated by the mining of the hanging wall triangular ore, as shown in Figure 2 and Figure 3 ; as shown.

[0015] 5) Mining of the footwall triangular ore: The footwall drilling roadway 8 is constructed at the top of the footwall triangular ore, and downward fan-shaped medium-deep holes are constructed using a medium-deep hole drilling jumbo. The footwall triangular ore is caved into the footwall ore-drawing roadway 6 at the bottom, and the ore is transported out by a LHD, as shown in Figure 3 ; as shown.

[0016] 6) Subsequent filling of the footwall goaf: Filling pipes are erected from the footwall drilling roadway 8 at the top of the footwall triangular ore, and subsequent filling of the goaf generated by the mining of the footwall triangular ore and waste rock is carried out. The formed subsequent filling body 9 can eliminate the safety hazards of the goaf, as shown in Figure 4 ; as shown.

[0017] In the above steps, the order of steps 2) and 3) can be changed. Example

[0018] Taking an iron mine as an example, the average thickness of the ore body is 50 m, the average dip angle is 45°, and the stage height is 50 m. Before adopting this method, after the inclined thick ore body was mined by the sublevel open stoping method in the medium-deep hole stage, the upward horizontal slice stoping method has been used to mine the triangular ore bodies in the hanging wall and footwall. The production capacity of the stope was only 200 t / d. After changing to this method, after the inclined thick ore body was mined by the sublevel open stoping method in the medium-deep hole stage, the medium-deep hole mining technology was used to mine the triangular ore bodies in the hanging wall and footwall, realizing the efficient and low dilution mining of the triangular ore bodies in the hanging wall and footwall of the inclined thick ore body.

[0019] 1) Downward pre-splitting and slotting in the hanging wall: Utilize the previously excavated drilling roadway in the upper stage. Along the interface between the hanging wall ore and rock, a row of downward pre-splitting deep holes are constructed using a medium-deep hole drilling jumbo. The hole diameter is 90 mm, and a cutting slot with a width of 0.5 m is formed by pre-blasting in the hanging wall.

[0020] 2) Upward pre-splitting and slotting in the footwall: Utilize the previously excavated ore-drawing roadway in the lower stage. Along the interface between the footwall ore and rock, a row of upward pre-splitting deep holes are constructed using a medium-deep hole drilling jumbo. The hole diameter is 90 mm, and a cutting slot with a width of 0.5 m is formed by pre-blasting in the footwall.

[0021] 3) Selective mining of the hanging wall triangular ore: Construct a hanging wall ore-drawing roadway at the bottom of the hanging wall triangular ore, with a specification of 4.5 m wide and 4.5 m high. Use a medium-deep hole drilling jumbo to construct upward fan-shaped medium-deep holes with a hole diameter of 90 mm. Utilize the cutting slot formed by pre-blasting in the hanging wall to achieve efficient selective mining of the hanging wall triangular ore, and use a load-haul-dump (LHD) vehicle to transport the ore out from the hanging wall ore-drawing roadway.

[0022] 4) Selective mining of the footwall waste rock: Construct a footwall ore-drawing roadway at the bottom of the footwall triangular ore, with a specification of 4.5 m wide and 4.5 m high. Use a medium-deep hole drilling jumbo to construct upward fan-shaped medium-deep holes with a hole diameter of 90 mm. Utilize the cutting slot formed by pre-blasting in the footwall to achieve efficient selective mining of the footwall waste rock, and use a load-haul-dump (LHD) vehicle to transport the waste rock out from the footwall ore-drawing roadway and backfill it into the goaf generated by the mining of the hanging wall triangular ore.

[0023] 5) Mining of the footwall triangular ore: Construct a footwall drilling roadway at the top of the footwall triangular ore, with a specification of 4.5 m wide and 4.5 m high. Use a medium-deep hole drilling jumbo to construct downward fan-shaped medium-deep holes with a hole diameter of 90 mm. Collapse the footwall triangular ore into the footwall ore-drawing roadway at the bottom, and use a load-haul-dump (LHD) vehicle to transport the ore out.

[0024] 6) Subsequent filling of the footwall goaf: Erect filling pipelines from the footwall drilling roadway at the top of the footwall triangular ore to conduct subsequent filling of the goaf generated by the mining of the footwall triangular ore and waste rock. The uniaxial compressive strength of the subsequent filling body formed is greater than or equal to 0.2 MPa after 28 days.

Claims

1. An efficient mining method for the triangular ore bodies in the hanging wall and footwall of inclined thick ore bodies, characterized in that After mining the inclined thick ore body by the middle-deep hole stage room method, the extraction of the triangular ore in the hanging wall and footwall is carried out, including the following steps: 1) Downward pre-splitting and slotting in the hanging wall: Using the upper-stage drilling roadway (1) formed by the middle-deep hole stage room method, along the interface between the hanging wall ore and rock, a row of downward pre-splitting deep holes is constructed by a middle-deep hole drilling jumbo, and the hanging wall cutting slot (2) is formed by pre-blasting; 2) Upward pre-splitting and slotting in the footwall: Using the lower-stage ore-drawing roadway (3) formed by the middle-deep hole stage room method, along the interface between the footwall ore and rock, a row of upward pre-splitting deep holes is constructed by a middle-deep hole drilling jumbo, and the footwall cutting slot (4) is formed by pre-blasting; 3) Selective mining of the hanging wall triangular ore: The hanging wall ore-drawing roadway (5) is constructed at the bottom of the hanging wall triangular ore, upward fan-shaped middle-deep holes are constructed by a middle-deep hole drilling jumbo, and then the hanging wall cutting slot (2) formed in step 1) is used to realize the selective mining of the hanging wall triangular ore, and the ore is transported out from the hanging wall ore-drawing roadway (5); 4) Selective mining of the footwall waste rock: The footwall ore-drawing roadway (6) is constructed at the bottom of the footwall triangular ore, upward fan-shaped middle-deep holes are constructed by a middle-deep hole drilling jumbo, and the footwall cutting slot (4) formed in step 2) is used to realize the efficient selective mining of the footwall waste rock, and the waste rock (7) is transported out from the footwall ore-drawing roadway; 5) Mining of the footwall triangular ore: The footwall drilling roadway (8) is constructed at the top of the footwall triangular ore, downward fan-shaped middle-deep holes are constructed by a middle-deep hole drilling jumbo, the footwall triangular ore is caved into the footwall ore-drawing roadway (6) at the bottom, and the ore is transported out.

2. The efficient mining method for the triangular ore bodies in the hanging wall and footwall of inclined thick ore bodies according to claim 1, wherein: It also includes the following step, subsequent backfilling of the footwall goaf: Filling pipelines are erected from the footwall drilling roadway (8) at the top of the footwall triangular ore to carry out subsequent backfilling of the goaf generated by the mining of the footwall triangular ore and waste rock.

3. The efficient mining method for the triangular ore bodies in the hanging wall and footwall of an inclined thick ore body according to claim 1, wherein: In step 4), after the waste rock is transported out, it is backfilled into the goaf generated by the mining of the hanging wall triangular ore.

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