Optimization of Blasting Parameters in open cast mines
There are three types of exploder used in Indian mines i.e. Magneto (or Dynamo) Exploder, Battery condenser Exploder and Condenser dynamo Exploder. 3.2.3 Blasting Pattern Followed in Opencast Mines In opencast mines both vertical and inclined holes parallel with bench face is practiced. Row of the holes may be in single or multiple.
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Ground vibrations and air blast effects induced ... - Longdom
poor blast designs, air blast can travel for long distances [11]. The over pressure may be expressed in Pascal (Pa) or with decibels (dB). The dB is calculated by the following formula (2): P log P P dB = 20 /(0) (2) Where P is the measured pressure. P 0 is the reference pressure of 2 10-5 Pa. Air blast is an atmospheric pressure waves ...
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blasting pattern in opencast mining
BLAST VIBRATION MONITORING IN OPENCAST MINES. 3.4 Drilling pattern 15-16 3.5 Blasting Pattern Followed in Opencast Mines 16 3.5.1 Single row firing pattern 16 3.5.2 Multi Row firing pattern 17 3.5.3 Beside cut pattern other pattern of blasting in multiple row of firing are as given below 18-19 CHAPTER 02: GROUND VIBRATION 4.1 Blast …
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blasting design in indian limestone mines
blasting design in indian limestone mines blasting design in indian limestone mines blasting design in indian limestone mines. Prediction of blast-induced flyrock in Indian limestone 01/10/2014 Experimental blasts have been conducted in 4 limestone mines in India. Out of datasets of 125 ex
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Prediction of Blast-Induced Flyrock in Opencast Mines ...
The aim of present study is prediction of blast-induced flyrock distance in opencast limestone mines using artificial intelligence techniques such as artificial neural network (ANN) and adaptive neuro fuzzy inference system (ANFIS). Blast design and geotechnical variables such as linear charge concentration, burden, stemming length, specific charge, …
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(PDF) ROCK BLASTING FOR MINING - ResearchGate
In opencast mines, both vertical and incl ined . ... [Show full abstract] exported from the model so that pattern and blast design can be undertaken in other software packages.
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Blasting Techniques Used in Underground and Opencast …
ADVERTISEMENTS: 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: ADVERTISEMENTS: (1) Pyramid cut or cone …
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Investigation Of Firing Patterns On Fragmentation In 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 ...
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Development and Application of Blast Casting Technique in ...
Blast casting is a high-efficiency technique applied in surface mines for overburden removal and results in stripping cost savings. According to ballistic theory and center-of-mass frame basic movement principles, key factors influencing blast casting effect were analyzed, which include bench height and mining panel width, inclined angle of blast holes, explosive unit …
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Blast design in opencast mining - SlideShare
Blasting patterns followed in opencast mine There are two types of blasting patterns followed in opencast mine – Single Row blasting pattern. Multi-row blasting pattern. Generally multi- row blasting patterns are followed for better fragmentation and less explosive consumption. 14. Multi-row blasting patterns 15.
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Enhancement of Drilling & Blasting efficiency in Opencast ...
underground and opencast mines / quarries, it has taken a major leap forward in enhancement of Techno-Economics advantages in working of mines. Drilling and Blasting is the most important activities in working of any mines. In particular, electronics are bringing a level of unprecedented precision to the process of breaking rock in the mines.
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An Investigation to Assess the Cause of Accident due to ...
The 'Danger Zone' as given in Coal Mine Regulations has already been increased from 300 to 500 m in the new Coal Mines Regulation [Reg. 196 (2) (b)] to avert flyrock-related accidents in opencast coal mines. There are many reasons for flyrock causes and associated accidents during blasting in opencast mines.
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Opencast Mining (Quarrying): Methods, Advantages ...
Opencast mining is also known as open-put mining, open-cut mining, surface mining and also as strip mining, the later term being commonly used in the U.S.A. for opencast mining of coal. The overburden and the mineral, coal, are excavated in long strips of a few metres thickness and hence the operations are termed strip mining.
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The basic patterns of drill holes employed in opencast ...
• The basic patterns of drill holes employed in opencast mines are • Square Pattern • Staggered (or) Triangular pattern • Single row blasting pattern • Multi blasting pattern • Wedge cut pattern • Diagonal blasting pattern • Square Pattern: • This pattern can also be called as multi row pattern.
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Optimization of Blasting Parameters in opencast Mines
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved.
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Optimization of blasting parameters in opencast mines
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved. Proper adoption of drilling and blasting can contribute …
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Blast optimization at Kriel Colliery J r n a
sections. The opencast was commissioned in 1978 and consists of two dragline pits and a mini-pit. Project background General information on blasting operations This study was conducted in both Pit 5 and Pit 6. The overburden in Pit 5 is drilled on a 10 m x10 m blast hole pattern and a bench height in excess of 30 metres. The blast holes
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Applicability of Controlled Blasting in Large Opencast ...
The Jayant Opencast Project is a coal mine producing 15.5 mtpa of coal and 51.5 Mm 3 of overburden is being removed through drilling and blasting. The mine is currently operating with dragline as well as shovel-dumper combination.
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NONEL INITIATION FOR ECO-FRIENDLY BLASTING
blasting arising from the mining operation is one of the fundamental problems in the ... large opencast mines are being planned with high production capacities. To achieve these ... fragmentation in blast design, the optimum blasting pattern to excavate a quarry efficiently
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Open Cast Mine Planning Mining And Blasting
Blast based on a specified blast hole pattern and the Load Haul and Dump of blast design and assessment for surface mines and quarries, open pit mining arm co za, pdf rock blasting ... optimization of blasting parameters in opencast mines, blast design software mine excellence, open pit mining wikipedia, amit 129 lesson 7 mine explosives and
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Blast Hole Drilling: The Basic Process | RPM Drilling
Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and associated mining activity.
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blasting pattern in opencast mines 1 - amadeus.edu.pl
blasting pattern in opencast mines; uses of calcium carbonate in iron manufacture; price of heena grinding machine; Stones Crushing In Limpopo; invitation letter for factory visit; ench grinder with emergency switch
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ASK MINING: Blasting Practices at Open Cast Mines
For Coal Mines (Overburden bench), an example 1. height of bench = 13-14m 2. width of bench= 20-25m 3. Avg. Burden= 4m 4. Avg. Spacing= 5m 5. Diameter of blast hole= 250mm 6. No. of blast hole/ blast = 20-35 7. Blasting …
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Drilling patterns - QueensMineDesignWiki
Blast patterns with square patterns are simple and provide good results where spacing equals the burden. Although, in hard rock mining triangular formations where the burden is 1.15 times greater than the spacing are more effective as it induces further twisting and shearing of the rock and avoids splitting between blast holes on planes before ...
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Surface Mine Blasting - OSMRE
The Bureau of Mines has sponsored a comprehensive research program to enhance the safe, effective, and efficient use of blasting technology by the mining industry. Recent research results of the surface mine blast ing program were presented at a …
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Optimization of blasting parameters in opencast mines - CORE
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved.
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Explosives Engineers' Guide
Spacing (S) = 1.15 x B (This gives an equilateral pattern) Subdrill = (3 to 15) x D Charge length (C) ≥ 20 D Stemming ≥ 20 x D or (0.7 – 1.2) x B Burden stiffness ratio = BH/B : 2 to 3.5 good fragmentation : > 3.5 very good fragmentation Stemming material size = D/10 to D/20 (Angular material with minimum fines) Presplit blasting
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(PDF) Comparison of Fragmentation Performance of Two ...
Further, the influence of the firing patterns was investigated on the total cycle time of 10 m 3 rope shovels excavating the blasted muck piles. Mine descriptionThe opencast coal mine, where the field study was conducted, is one of the largest opencast coal mines of India. The mines exist in Singrauli coalfield of Northern Coalfields Limited (NCL).
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Optimized design of drilling and blasting operations in ...
Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages. While previous research has focused on optimizing these operations as two separate parts or merely in a specific parameter, this paper proposes a system dynamic model (SDM) for drilling and blasting operations as an interactive system.
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Opencast Mine Overburden Blast - YouTube
About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators ...
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BLAST VIBRATION MONITORING IN OPENCAST MINES
3.5 Blasting Pattern Followed in Opencast Mines 16 3.5.1 Single row firing pattern 16 3.5.2 Multi Row firing pattern 17 3.5.3 Beside cut pattern other pattern of blasting in multiple row of firing are as given below 18-19 CHAPTER 02: GROUND VIBRATION 4.1 Blast Vibration 21 4.2 Ground Vibration 21 ...
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optimisation of fragmentation of stone crushing through ...
Drilling and blasting are the major unit operations in opencast mining. Inspite of the best efforts to introduce mechanization in the opencast mines, blasting continue to dominate the production. Therefore to cut down the cost of production optimal fragmentation from properly designed blasting pattern has to be achieved.
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Open Cast Coal Mining Blasting Pattern- SOF Mining machine
Blasting pattern in opencast mining blasting pattern in opencast mining himalayahouse explosive casting is the technique used by many surface coal mines to control the displacement of overburden by means of explosive energy the casting moves of the overburden into the minedout pit while the remaining spoil is removed. Get Details
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Optimization of Blasting Operation in Opencast Mine
In opencast mining both vertical and inclined holes practiced with the bench face. The holes drilled in a row may be single or multiple. So those two patterns are used, mainly in the opencast mines. They are: a) Single row blasting pattern b) Multi row blasting pattern Single row blasting pattern:
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Rock fragmentation control in opencast blasting ...
1. Introduction. Rock fragmentation distribution influences a range of mining and milling processes including load and haul rates, crushing and grinding performance and ore recovery in beneficiation processes (Michaud et al., 1997).In opencast mining, where blasting is employed for excavation, the overall cost effectiveness of the production operations is …
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