Development of an evaluation system for blasting patterns to …
From various performed patterns, the efficient and inefficient ones were determined using Data Envelopment Analysis and the most suitable blasting pattern was selected as the most appropriate blasting pattern and suggested for the future blasting operations. Blasting is one of the most important operations in mining projects involving production. Inappropriate blasting …
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Drill Pattern Optimisation for Large Complex Blasts to Improve
In a study of 10 blasts from a Pilbara iron ore mine, for the dig efficiency objective, results indicate that variable designs achieve (sim ) 2% better dig efficiency, with (sim ) …
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6 Common Blasting Methods in Open Pit Mining
In open pit mining, there are several commonly used blasting methods as follows: Classification according to blasting delay time: simultaneous blasting, microsecond blasting, and millisecond blasting.
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(PDF) Blasting pattern optimization in open-pit mines …
The genetic algorithm (GA) is the recommended method to utilizing the optimized pattern for the blasting pattern selection under the many effective parameters which is the variety of noteworthy ...
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Geometrical specifications of a drilling pattern considered to …
Aryafar et al. (2020) used Analytic Hierarchy Process (AHP) and other methods to select the most proper drilling and blasting pattern in Sangan Iron Mine, Iran. He reported that, drilling...
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Selection of the most proper drilling and blasting pattern by …
99 Selection of the most proper drilling and blasting pattern by using MADM methods … Rudarsko-geološko-naftni zbornik i autori (The Mining-Geology-Petroleum Engineering Bulletin and the ...
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SELECTION OF THE MOST PROPER DRILLING AND …
Multi-Attribute Decision-Making (MADM) methods can be useful approaches to select the appropriate drilling pattern among various alternatives, performed previously. This …
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[PDF] Designing controlled blasting in the vicinity of sensitive
The developed controlled blasting patterns and methods can be used as AIDS for similar work in the absence of adequate scientific evaluation results. This paper presents a case study at an Indian iron ore mine where controlled blast patterns were meticulously planned after conducting a few trial blasts for conducting blasts near numerous ...
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(PDF) ROCK BLASTING FOR MINING
In mining operations, blasting has become a routine work. With proper understanding of the rocks and blasting methods, the mining work can …
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Developing a mathematical assessment model for blasting patterns
Blasting is one of the most important operations in the mining projects that has effective role in the whole operation physically and economically. Unsuitable blasting pattern may lead to unwanted events such as poor fragmentation, back break and fly rock. Multi attribute decision making (MADM) can be useful method for selecting the most appropriate blasting …
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Overview of Underground Metalliferous Mining | SpringerLink
There is existence of underground iron ore mines viz. Kiruna underground mine in global scenario (Dineva and Boskovic 2017; ... These deposits are excavated dominantly by drilling-blasting method (DBM). However, mechanical excavators using shearer, continuous miner, surface miner and high-wall mining equipment are used at few places for the ...
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Blasting Techniques Used in Underground and Opencast Mines
Read this article to learn about the blasting techniques adopted in underground and opencast mines. Drilling patterns, also called shot-hole patterns, are named after the type of cut holes …
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(PDF) Designing controlled blasting in the vicinity of sensitive
This paper presents a case study at an Indian iron ore mine where controlled blast patterns were meticulously planned after conducting a few trial blasts for conducting blasts near numerous ...
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Selection of the most proper drilling and blasting pattern by using
Multi-Attribute Decision-Making (MADM) methods can be useful approaches to select the appropriate drilling pattern among various alternatives, performed previously. This paper aims …
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Evaluation of effect of blasting pattern parameters on back …
The Gol-E-Gohar iron mine in Iran was considered as a case study. A four-layer ANN was found to be optimum with architecture of seven neurons in input layer, 15 and 25 neurons in first and second ...
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Evaluation of effect of blasting pattern parameters on back break …
In this paper, the artificial neural network (ANN) technique was used to determine the near-optimum blasting pattern so that back break is reduced. The Gol-E-Gohar iron mine …
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SELECTION OF THE MOST PROPER DRILLING AND BLASTING PATTERN …
This paper aims to select the most proper drilling and blasting pattern for Sangan Iron Mine, Iran. To achieve this, in the first step, rock fragmentation, back break, fly rock, specific charge and specific drilling were considered as the decision criteria and their degree of importance was calculated using the AHP method under a fuzzy ...
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BlastHole Drilling Introduction
Open Pit Blast Pattern. Rules of thumb. Burden 25 to 35 hole diameters; Spacing ... It is the dominant method for holes larger than 203 mm (8") diameter. In smaller holes, it is most common in softer rock formations. ... Iron Ore; Market Survey Metals – Bauxite, Alumina, Aluminium; 7 Rules of Thumb for Open Bit Blast Pattern;
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Innovative Blasting Practices for Underground Hard Rock …
Additionally, the blasting methods for narrow vein mining and excavation in ore-waste combination have also been discussed in this chapter. 8.1 Introduction Production enhancement and improving grade of the excavated mineral are two main goals of a mining engineer. Optimization of blasting pattern has significant contri-
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Drill Pattern Optimisation for Large Complex Blasts to Improve
For iron ore, over-blasting results in a higher percentage of material under the lump product size threshold ((sim ) 7 mm). A blast with a significant standard deviation from the target could also create oversize rocks. ... Tavakkoli E (2020) Selection of the most proper drilling and blasting pattern by using madm methods (a case study ...
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An Assessment of Drilling and Blasting Techniques at Granite …
The objectives were to identify drilling and blasting equipment, find out the drilling pattern and parameters, assess blasting method and its compliance with safety practices in and around the blast site and review the impact of the blasting …
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Blasting Operation Management Using Mathematical Methods
In the second step numerical Taxonomy method was used for ranking the remaining efficient patterns and recognizing the most suitable pattern in the Sungun copper mine, Iran. According to the obtained results, blasting pattern with burden of 3 m, spacing of 4 m and stemming of 3.2 m was selected as the best pattern and suggested to be considered ...
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SELECTION OF THE MOST PROPER DRILLING AND BLASTING PATTERN …
Drilling is the first stage of open pit mining that has a considerable effect on the other stages of mining, including blasting, loading, hauling and crushing. An unsuitable drilling pattern may lead to undesirable results such as poor fragmentation,...
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Selection of the most proper drilling and blasting pattern by …
gested pattern are 2.3 m and 2.6 gr/cm3, respectively. Keywords: Drilling and blasting pattern; Sangan Iron Ore Mine; AHP; TOPSIS; PROMETHEE 1. Introduction Drilling and blasting play a vital role in mining pro-jects. The quality of the blasting operation and subse-quently, the adequate rock fragmentation are effective
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DESIGNING CONTROLLED BLASTING IN THE VICINITY …
The developed controlled blasting patterns and methods can be ... Kirandul iron ore mine where controlled blasting techniques were developed according to scientific
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Evaluation of effect of blasting pattern parameters on back break …
In the past, mostly empirical methods were used in design of blasting pattern. With regard to the fact that the number of effective parameters is too high and the interactions are too complicated, empirical methods may not be fully suitable for this purpose. ... Dehghani H. Blasting pattern design in the Gol-E-Gohar iron ore mine using ...
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(PDF) Method for calculation of drilling-and-blasting operations
(34) The actual explosive consumption on the face is: (28) Qact = N cut ⋅ Qcut + N out ⋅ Qout + + N o.sr ⋅ Qo.sr + N o.b ⋅ Qo.b, Total number of blast-holes in mine working face is: N = N cut + N out + N o, pcs, (31) The value of the outside blast-hole charge is: where: Po – perimeter of outline blast-holes, m; аo – distance ...
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Study on damage characteristics of iron ore under variable line …
Blasting test research was conducted on iron ore specimens with variable line density charging structures. Computer tomography (CT), digital image processing, and three-dimensional model reconstruction techniques were used to analyze the damage characteristics of iron ore specimens after blasting based on the calculated number of box dimensions.
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Studies on Physical and Mechanical Properties of Iron Ore in …
The preface to research the result of the study on physical and mechanical properties of iron ore is in Haji gak iron ore mine in order to design the optimal blasting parameters during mining ...
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An empirical relation to calculate the proper burden in blast …
In order to design the pattern of the southern mass, the empirical relations which were used for various blasting patterns in the main pit of Chadormalu iron mine (northern …
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