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A mining method and mining house technology, which is applied in the field of multi-layer inclined thin ore body, shallow hole rock drilling blast force-electric rake cooperative transportation and segmented mine house mining method, which can solve the problems of low production capacity, low transportation efficiency, Problems such as large amount …
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Cutting Drift. It is a necessary sinking and driving engineering used to form the blocked-out ore reserves in the stope (or ore blocks), and to form the free surface and compensation space during stoping blasting, and to provide good ore drawing conditions in stopping. Its layout is related to the stoping sequence and mining methods in the stope.
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Explosives are used to break and fragment the ore and waste rock. Shallow holes are drilled and filled with explosives blasting the rock to pieces. This is called drilling and blasting. The blasted rock is collected …
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1. Introduction. The hanging-wall ore-body is the ore-body which residues inside open-pit slope after the normal surface mining. Figure 1 shows a mode of the occurrence of hanging-wall ore-body at the Dagushan Iron Mine in China. According to statistical data, the residual ore-body outside the open-pit boundary accounts for 5–16% …
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A new mining method was proposed to resolve these issues. The new method is called 'vertical strips with T-shape mining method and shallow-hole millisecond-delay blasting technology'. The T-shape mining with vertical strips can reasonably improve the stability of the roof exposed area, and significantly reduce the ore-dilution because of no ...
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The deformation of surrounding rock in the withdrawal roadways of fully mechanized working faces is a critical factor affecting the safe and efficient withdrawal of mining equipment. In order to address this issue, an experimental study was conducted on an innovative method for pre-split blasting to protect withdrawal roadways, using a …
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To solve the problem of large deformation of deep soft rock roadway, taking the soft rock roadway of no. 1 coal mine in New Shanghai as an engineering example, the deformation mechanism of surrounding rock of deep soft rock roadway is analyzed by combining theoretical analysis, numerical simulation and field test, and the control …
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In mining engineering, medium-deep hole blasting has been widely used in mining. Compared with shallow hole blasting, medium-deep hole blasting has a larger one-time ... blasting amount, more ore ...
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Sublevel shrinkage (SLSh) is an underground mining method similar to sublevel caving (SLC) but with continuous backfilling from the top. It features a top-down mining sequence with production drifts orientated in a longitudinal or transverse way in the orebody. Fan drilling and blasting is done from the production drifts, from where the ore …
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In the overhand mining, the bottom layer is first mined, and then the upper layers are mined in turn. In the underhand mining, the top layer is first mined fully or in advance with shallow holes to form the underhand step working face, and then the horizontal blast hole or the vertical hole is drilled for ore breaking.
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Meanwhile the holes are charged and a blast pattern which covers a large area within the stope breaks up a large volume of ore in one blast. The blasted ore drops to the stope bottom to be recovered by the LHD vehicles mucking in the draw-point beneath the stope. Normally, the long-hole drilling stays ahead of the charging and blasting ...
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The room-and-pillar mining method is suitable for mining horizontal or flatly dipping ore bodies with low ore value and stable ore rock. The shallow hole room-and-pillar mining method is adopted for the ore body of the thickness less than 8 m. When the thickness of the ore body is 8–20 m, the medium-deep hole room-and-pillar mining …
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Definition of gophering. i. A method of breaking up a sandy, medium-hard overburden where blastholes tend to cave in. A series of shallow holes are made by a bar, and an explosive charge is fired in each. The debris is removed, and the holes are deepened and further charges fired until the holes are deep enough to take sufficient explosives to ...
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blasting cost and effect were obtained with a hole bottom spacing of 2.48 m and a minimum burden of 1.6 m using the desirability function. This study can provide solutions to the fan-holes blasting difficulties that are encountered with deep mining. Key words: high in-situ stress; fan-holes blasting; numerical simulation; response surface method
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The blasting quality of open-pit mining can be enhanced and the production cost of stope reduced by establishing a mathematical model for step drilling and blasting costs based on stope consumption. By enhancing the Gray Wolf algorithm, the parameters for step drilling and blasting are optimized, resulting in improved effectiveness for step …
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The blast hole spacing must be closer than that of the overburden rocks. The process involves charging with ANFO explosive and light blasting. ... The total cycle of ore and waste mining is given in Fig. 12.2. Figure 12.2. A schematic view of the complete operating cycle of mining for shallow-bedded deposits like coal and lignite seams.
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The optimal values of key parameters are determined as the roof cutting height of 49.9 m, the roof cutting angle of 10°, and the blast hole spacing of 10 m. The results of this study have been ...
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Interior region of the cut hole: The traditional cut hole adopts a continuous charging method, which works well for shallow hole blasting. However, as the drilling depth increases, the rock-breaking efficiency of the explosive does not improve despite the increase in the length of the explosive, 23 and the anti-knock performance of the rock ...
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The simulation results of double blasting holes show that when the blasting hole diameter is 113 mm and the hole spacing is 5.5 m, controlling the delayed blasting time at 25 ms improves the ...
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Deep hole blasting is a blasting method widely used in open pit mines. The depth of the blast hole is generally 15-20m. The aperture is 75-310mm, and the commonly used aperture is 200-250mm. 4 ...
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A model with two blast holes was built in LS-DYNA according to actual conditions at Baba-Ali Iron Ore Mine. Geometry and dimensions of the model are demonstrated in Fig. 3. Diameter and depth of the blast hole were 76 mm and 6 m, respectively. The stemming and sub-drilling lengths were 50 and 30 cm, respectively.
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which sublevel caving (SLC) method yields markedly higher ore loss up. to an average ore loss ratio of 22% than many other mining methods. 1. SLC method is widely used in various underground metal ...
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Due to the long history of mining, shallow mineral deposits are nearly depleted, ... This is in part due to the nature of mining (e.g., drilling and blasting, loading and transportation) and the presence of dry air. ... various ore pass systems such as box holes in raise lines/stopes and slushers have been developed to aid manual ore sorting ...
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The mineral industries have seen significant shift towards the underground mining due to extinction of shallow depth ore deposits (Carvalho 2017). The exploitation of mineral deposits by underground is advantageous in many other aspects as well. ... This method has advantage of large diameter and deep hole drilling and blasting.
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Programmable blasting caps can even enable mines to take larger stopes; if you can open up a larger stope through blasting, that can help with increased productivity." Safety has been a primary driver in the adoption of mechanized mining. The use of handheld mining equipment like jacklegs are often associated with musculoskeletal diseases.
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The depth of coal exploitation is increasing at a rate of approximately 20 m per year in China. 8 Different from shallow coal seams, in-situ stresses are large in deep, ... Results show that before deep-hole blasting, mine tremors (#1–4) occurred mainly due to the tensile fracture of the overlying rock. Due to the deep-hole blasting, the ...
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Drilling drives are 2.8 metres wide by 1.6 metres high to accommodate the Tamrock Solo LP 126 LC10. Details of the machine are shown in the Appendix. The width of 2.8 metres is to suit the long hole drilling feed equipped with 1.2 metres extension steel. The height is to suit the 1.3 metre height of this drilling rig.
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Deep hole blasting is a blasting method widely used in open pit mines. The depth of the blasthole is generally 15-20m. The aperture is 75-310mm, and the commonly used aperture is 200-250mm. Characteristics of deep hole blasting: The number of rock blasts in one blasting is large, generally 200,000-1 million tons.
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most of the shallow depth ore deposits are in the stage of extinction. To achieve the production pace from underground, the mining with blasting of larger number of holes in a same blasting round was the need. One special …
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Room-and-pillar mining - A method of mining where rooms of ore are dug out while pillars of untouched material are left to support the roof. Rotary drill - A drilling machine that uses a rotating motion to cut into the rock, typically used for drilling large-diameter blast holes in open-pit mines.
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Many studies have demonstrated that conventional wedge cutting blasting can achieve an acceptable rock breaking effect and high hole utilization in shallow hole blasting driving, but obtaining a ...
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The long-hole mining begins by the excavation of an open raise. The drilling is done from the lower level and the blasting from the upper level. ... (59 ft) high hill in order to take advantage of the local shallow base of oxidation and to limit environmental impact. DEVELOPMENT. Ramp: The ramp is located 60 m to 80 m (197 ft to 262 ft) of the ...
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