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 ...
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.
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 …
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 …
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 …
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 …
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 …
In this study, which dealt with the amount of fragmentation in Pir Ali limestone mine, the digital image processing method and Split Desktop software that is the most efficient software in this respect were used. Three blocks with different blast patterns were analyzed to study the fragmentation phenomenon and, ultimately, the F20, F50 and …
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.
A unique validation tool developed on statistically designed response surface methodology (RSM) has been suggested for determining the rate of influence of …
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 …
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 ...
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] .
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 …
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 ...
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 .
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 …
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 …
Request PDF | On Feb 1, 2004, Piyush Rai and others published Investigation of firing patterns on fragmentation in an Indian opencast limestone mine | Find, read and cite all the research you need ...
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 …
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 …
WipJoint characterizes the pattern of geological joints, faults, and other lineation in the rock mass. Structural mapping and photo analysis of all the benches of experimental sites were conducted, which is essential for blast designs to get the desired fragmentation. One of the views of the mine blast face and working process is depicted in ...
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 ...
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 …
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 ...
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.
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.
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 ...
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.
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 …
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 ...
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) …
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 …
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 …
ROCK BLASTING FOR MINING. Prof. A. Balasubramanian. Centre for Advanced Studies in Earth Science. University of Mysore. Mysore-6. Objectives: You are …
A unique validation tool developed on statistically designed response surface methodology (RSM) has been suggested for determining the rate of influence of blast design parameters on the ground vibrations with a case study of a limestone mine. Design-Expert software has been used to assess the intended statistically designed model.
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 crucial nuisances of blasting, which should be accurately estimated to minimize its effect. In this paper, an attempt has been made to apply various models to predict ground …
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()