Use of bulk emulsion explosives in place of ANFO poses significant burden of high cost due to the high density explosive being used. However, some mines like Rajashree cement limestone mine had ...
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A good fragmentation and a minimum ground vibration are characteristics of a successful drilling and blasting operation. In this study, 78 blasting events of AlvandQoly limestone mine located in Kurdestan cement company in west of Iran were investigated. The vibrations induced blasting was recorded by seismograph and analyzed.
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The firing patterns used were: 'skewed V', 'in line', 'diagonal' and 'extended V'. Results for blast designs using a 150mm blasthole diameter. The field observations and the results of the four blasts, all conducted on the same limestone bench, are tabulated in table 2. The drilling and firing patterns for the four blasts are ...
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Blasting operations create significant problems to residential and other structures located in the close proximity of the mines. Blast vibration is one of the most …
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Except for very deep-seated deposits, open cast mining method has been recognized as the safest and most productive mode for mining minerals. Ever growing demand in minerals and coal has compelled the mine operators to increase the size of mine, which has resulted in an increasing trend towards large capacity open cast …
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Designing blast patterns using empirical formulas : a comparison of calculated patterns with plans used in quarrying limestone and dolomite, with geologic considerations. Responsibility by Joseph M. Pugliese ... Information circular (United States. Bureau of Mines) ; 8550 Note I 28.27:8550 bound with I 28.27:8546.
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A series of bench blasting productive tests were conducted in Heishan coal mine in Xinjiang, China. The rock mass of the quarry is slightly weathered sandstone, the saturation moisture compressive strength is 24–42 MPa, and the natural density is 2.41–2.69 g/cm 3.The blasthole diameter used in the previous blasts is 138 mm, and the …
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Monjezi et al. (2012) used the TOPSIS method to select the most appropriate blasting pattern in Tajareh limestone mine. Wang and Zhou (2011) discussed how the analytic …
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Sadeghi et al. (2020) used an artificial neural network and decision tree to predict the toe volume due to bench blasting using 100 blasting data of a limestone mine. They considered six effective parameters including spacing, stemming, hole depth, burden, sub-drilling, and powder factor to develop the models. Then, they optimized the blasting ...
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E. E. Gomaa. In a limestone quarry mine, fragmentation is a crucial outcome of blasting operations. The optimization of blasting operations greatly benefits from the prediction of …
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The developed ANN model was used as an objective function for imperialist competitive algorithm (ICA), and it was found that the ICA algorithm is able to decrease PPV up to 59% by considering burden of 2.9 m, spacing of 4.4 m and charge per delay of 627 Kg. Blasting operations create significant problems to residential and other …
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The existing blast pattern during experimental blasts has delay interval of 500 ms between two rings. Accordingly, a sample blast design with delay timing has been suggested for day-to-day blasting at the mine. The suggested blast design is shown in figure 10. The delay gaps of 500 ms to 1000 ms between two successive rings have …
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Received 13 October 2019; received in revised form 28 December 2019; accepted 29 December 2019 Keywords Blasting cost Limestone mines Gene expression programming Non-linear multivariate regression Artificial neural networks Modeling Abstract The use of blasting cost (BC) prediction to achieve optimal fragmentation is necessary in order to ...
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Fragmentation assessment and design of blast pattern at Goltas Limestone Quarry, Turkey ... Blasting is widely used in mining and civil engineering due to its economy and efficiency [1][2][3][4][5] .
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Lesson 6.4: Blasting Patterns. We have learned much about explosives, as well as some analytical procedures to help us design blast rounds in surface and underground mines. We know that a blast round consists of multiple holes arranged in certain geometric patterns, and we know that the holes are not necessarily fired at the same time. We don ...
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Blasting is regarded as a widespread rock fragmentation technique used in mining projects. Most of the blasting energy is squandered in generating unfavorable environmental effects like ground vibration, air-overpressure, flyrock and back-break [1,2,3,4,5,6,7,8].As stated by institute of markers of explosives (IME), flyrock is an …
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During blasting operations in open pit mines, most of the blast energy (approximately 40%) is wasted due to ground vibration. This phenomenon causes damages to the surrounding structures and pit ...
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The holes are made close to vertical. The drilling pattern was staggered. Blasting has been carried out using EMULSION BOOST, KELVEX-600 and Ammonium nitrate fuel oil (ANFO) explosives. The explosive was detonated using shock tube-based detonator and the different firing pattern used in mine are shown in Figures 2a–c.
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Introduction. Goltas limestone is used in cement production. The design of blast pattern at Goltas limestone quarry is given in two steps. Firstly, the prediction of mean fragment size from Kuznetsov's equation [1] S 50 = A q-0. 8 Qe 1 / 6 (115 / E) 19 / 30 In Eq. (1), A—rock factor, S 50 —mean fragment size (cm), E—relative weight strength …
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Drilled and loaded blast patterns may be tied in to create different burden to spacing relationships. Commonly used designs are: 1. Square pattern tied en-echelon or across two free faces – Known as a V-1 tie-in, this is a non-staggered pattern. Tie-in is on the diagonal of the square and is oriented at 45 degrees to the free face.
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Blast-induced ground vibration is considered as one of the most hazardous phenomena of mine blasting, which can even cause casualties and severe damages to the adjacent properties. Measuring peak particle velocity (PPV) is helpful to know the actual vibration level but prediction of blast vibration prior to the blast is a tedious job due to …
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Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: (1) Pyramid cut or cone cut (2) Wedge cut (3) …
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A well designed blast is a controlled blast, with the blasthole pattern so arranged that best advantage is obtained from the explosives' energies, the properties of the material being blasted, and ...
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Publication Date: 1972: Personal Author: Pugliese, J. M. Page Count: 40: Abstract: The work was done to provide quarry operators with an uncomplicated, first approximation method for designing blast patterns, considering geologic structure, and to show the valid use of the technique by comparing drill and blast pattern dimensions used in the quarry …
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The efficacy of a mixture of ammonium nitrate prills, sawdust, fresh diesel and used oil (engine oil, hydraulic oil, transmission oil, etc.) as an efficient explosive was investigated in a limestone mine of Adhunik Cement Limited, Jaintia Hills, Meghalaya, India. An air decking column of 1 m length wooden spacer was used in each blast hole.
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Limestone mining is being implemented by fully mechanized opencast mining methods in all the mines under the study. The working pit has been excavated by developing working benches of 9–10 m in height. ... Prediction of surface blast patterns in limestone quarries using artificial neural networks. International Journal for Blasting and …
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Under well-controlled conditions, Ouchterlony et al. [] assessed energy partitioning of limestone production blasts and computed in-hole losses, seismic energy, the kinetic energy of throw, and fragmentation energy.Their search revealed the energy partitioning of a blast with bulk emulsion explosive would be []Crushing and other losses …
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To optimize blasting pattern parameters and also reduce amounts of flyrock and oversize boulders, this section describes the optimization procedure by ICA in the Chah Soleiman limestone mine. In the first step of ICA modelling, there is a need to introduce an objective function to the system.
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Charging pattern for blast. CONCLUSION The study illustrates the challenges posed by geo-mining conditions for blasting at 2m from wagon tippler under construction at one of the limestone mine in India. The …
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Optimization of blasting design in open pit limestone mines with the aim of reducing ground vibration using robust techniques June 2020 DOI: 10.1007/s40948-020-00164-y(0123456789().,-volV()
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Conference Paper. Optimized Burden-Spacing for Improvement of Rock Fragmentation by Blasting in Limestone Mines. February 2024. Conference: …
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The efficacy of a mixture of ammonium nitrate prills, sawdust, fresh diesel and used oil (engine oil, hydraulic oil, transmission oil, etc.) as an efficient explosive was …
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1.. IntroductionGoltas limestone is used in cement production. The design of blast pattern at Goltas limestone quarry is given in two steps. Firstly, the prediction of mean fragment size from Kuznetsov's equation [1] (1) S 50 = A q-0. 8 Qe 1 / 6 (115 / E) 19 / 30 In Eq. (1), A—rock factor, S 50 —mean fragment size (cm), E—relative weight …
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Rippers can be used for limestone mining as limestone is a 'rippable' sedimentary rock (refer to Sect. 3.1.1) Using rippers in small mines or for a group consisting of more than one mine is economical and productive. Instantaneous blasting or blasting with delay detonators in mines are executed in circuits.
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V-T ype ring pattern in a limestone mine. All other blast . design variables were kept cons tant while varying the ring . patterns only. is leads to determination of the pure e ect .
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The mining process involves several sequential stages, including drilling, blasting, loading, transportation, and mineral processing. Among these stages, blasting costs (BC) exhibit greater sensitivity compared to others. Inadequate blasting practices can lead to additional drilling, increased explosive consumption, and environmental …
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