blasting pattern in opencast iron mines

Blast-Induced Rock Fragmentation in Wet Holes | Mining, …

In open-pit mining, blasting pattern design is performed to achieve a desired degree of fragmentation for loading, hauling, and crushing operations. Inappropriate fragmentation of rock will result in numerous problems such as incurring extra costs for secondary blasting, production interruption, etc. Wetness of the blast holes is one of the …

Optimization of blasting parameters in opencast …

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 …

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:

Controlled Blasting Within Danger Zone of 500 M From

The mine is located in Pakur District, Jharkhand State. The residential houses and other important structures were present within 100 m from the studied blasting sites. The study was conducted to develop controlled blasting patterns for safe blasting operations within the blasting zone of 50–100 m from the nearby dwellings.

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 …

Blasting Pattern In Opencast Iron Mines

34 Drilling pattern 1516 35 Blasting Pattern Followed in Opencast Mines 16 351 Single row firing pattern 16 352 Multi Row firing pattern 17 353 Beside cut pattern other pattern of Opencast mines: a subject to major concern for human health 113 Кб Similar is the case with the three big opencast iron ore mines of blasting pattern in opencast ...

Optimization of Blasting Operation in Opencast Mine

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: In single row blasting pattern only one row of holes are drilled and charged in a bench face.

Blasting Techniques Used in Underground and Opencast Mines | Mining

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) …

ASK MINING: Blasting Practices at Open Cast Mines

Following are some important facts related to blasting practices in open cast mines:-. 1. Drilling: There are two major types of drilling techniques being used. Down the Hole (DTH): It is used when the blast hole diameter varies from 100mm to 380mm and the depth of blast hole is 12-15m. Rotary: When the blast hole diameter > 400mm and the …

Design of controlled blasting (pre-splitting) in Golegohar iron …

This technique is especially effective in back-break control through providing a separating surface between the main blasting pattern and open pit final walls. In this study, a large open pit mine was the case study for the goal of designing pre-splitting through implementation of direct and cost effective experiments.

Optimization of blasting parameters in opencast …

1.1 Blasting and ground vibration Being one of the oldest contributors to the world's indus-trial age, mining has a big role to play in building our modern world. A majority of the …

Blast vibration Monitoring at opencast Iron Ore Mine

View PDF. Blast Vibration Monitoring Technique at Opencast Iron Ore Mine- A Case Study Ashish Kumar1, Prerna Bharati2, Shiv Shankar Kumar Choudhary3 1 Department of Mining Engineering, National Institute of Technology, Rourkela, Odisha 2 Department of Law, Bangalore Institute of Legal Studies, Bangalore, Karnataka 3 Department of Mining ...

Optimized design of drilling and blasting operations in open pit mines

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 …

Simultaneous prediction of fragmentation and flyrock in blasting …

Further, the SveDeFo model by Hjelmberg [11] considers the rock mass type and the blast pattern for mean fragment size prediction. Meanwhile, these predictive models have not incorporated all of the relevant parameters. ... The Sangan iron mine is located 300 ... Flyrock prediction and control in opencast mines: a critical appraisal. …

Optimization of drilling and blasting operations in an open pit mine

Drilling and blasting play vital roles in opencast mining. These operations do not only affect the cost of production directly but as well the overall operational costs (Busuyi, 2009). The ...

Blast-Casting Mechanism and Parameter Optimization of a

1. Introduction. Blast-casting practice in opencast coal mines is characterised by large blast hole diameter and large charges. The powerful energy produced by the explosive would break the rock mass into pieces and then eject them from the working bench.

Energy Factor-Based Blast Design in Large Opencast Coal Mines

Blasting is a part of Large Opencast Coal Mine (LOCCM) operations, and is scheduled based on production requirements. With dragline pits, equipment size and operating parameters allow engineers to ...

Optimization of Blast Design Parameter for Ring Blasting in …

Sublevel stoping is the most popular and practiced mining method in underground hard rock mines. Proper planning and its execution is the key requirement for stope extraction using this method. The stope extraction has been a challenging task since decades. The major reason is the unavailability of free faces as compared to opencast …

Optimization of blasting parameters and prediction of …

@article{Bai2023OptimizationOB, title={Optimization of blasting parameters and prediction of vibration effects in open pit mines based on deep neural networks}, author={Runcai Bai and Pengfei Zhang and Zhiqiang Zhang and Xue Sun and Hong Lu Fei and Shi-Tai Bao and Gang Hu and Wenyan Li}, journal={Alexandria Engineering …

Blasting Principles

The combined cycle of drilling and blasting, often classified as a discrete process and cost centre in most mines. Drill Pattern. A group of blastholes on a bench or face form a drill pattern. E Effective Energy. The amount of energy a user can expect to have available to do effective work.

Innovative Blast Design for Reduction of Boulder Generation in Opencast …

The geological and geotechnical parameters are assessed in this process. The charging pattern, delay timing and free face condition primarily affects the resulting blast induced fragmentation. In this paper, an innovative blast design methods used at Kanchan opencast coal mine to reduce the generation of oversize boulders, has been …

INFLUENCE OF ROCK AND EXPLOSIVES PROPERTIES …

influence of rock and explosives properties and blast design parameters on dust generation during blasting in opencast coal mines – an approach s. roy1 and t. n. singh2 abstract

Prediction of blast-induced dust emissions in surface mines …

Roy S, Singh T (2008) Influence of rock and explosives properties and blast design parameters on dust generation during blasting in opencast coal mines—an approach. Min Eng J 10:14–25. Google Scholar Sanchidrián JA, Ouchterlony F (2016) A distribution-free description of fragmentation by blasting based on dimensional analysis.

Evaluation and optimization of blasting approaches to

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 …

(PDF) Determination of Powder Factor for an Optimize d Blast Pattern …

Determination of Powder Factor for an Optimize d Blast Pattern Design Using Artificial Neural Network (Case Study: Gol-e-Gohar Iron Ore Mine) September 2007 Conference: 3rd Iranian Rock Mechanics ...

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.