final wall blasting in open pit mines
Mining Blasting
It is suitable for stripping of open-pit mines. Since 1960, China has used directional throw blasting technology to build tailings dams several times, with good results. According to the purpose and environment of blasting, mine blasting can be divided into tunnel, shaft, and raise blasting, underground stope blasting, and open-pit mine blasting.
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A new methodology to predict backbreak in blasting …
Backbreak is by far one of the most important types of breakage in opencast mining as it has profound effect on the final contours and wall stability conditions. ... feature in the area and the largest open-cast copper mine in Iran. Fig. 1 shows a general perspective of this open pit mine. ... A. Wall control blasting in open pits. CIM ...
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The Effectiveness of Pre-Splitting as a Method of Wall …
An attempt has been made to examine the impact of blast vibration, joint frequency and relative joint orientation to the pre-split blasting at Rampura-Agucha Pb-Zn open pit mine of Hindustan Zinc ...
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Controlled blasting in an open-pit mine for improved …
The use of presplitting with the blasting programme for an open-pit copper mine produced a significant improvement in the soundness of the final slope face. As a result of the increased quality of the cut slopes, the mine management were able to adopt 20 m high benches with a steep overall slope angle of 60".
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Pre-Split Blast Design For Open-Pit And Underground Mines
SYNOPSIS:. Perimeter blasting techniques limit damage to the final walls of excavations. This is accomplished by lowering the explosive energy concentration of the excavation boundary. The most common method is pre-splitting which involves the formation of a crack coincident with the excavation boundary prior to firing the main blast. This crack serves …
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Continuous Monitoring and Improvement of the Blasting Process in Open
The current techniques used for monitoring the blasting process in open pit mines are manual, intermittent and inefficient and can expose technical manpower to hazardous conditions. ... 2D images of the pit wall to generate a 3D model or an orthophoto for structural mapping and assessing the impact of blasting on the final wall geometry. By ...
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Delay time optimization in blasting operations for …
Blasting induced vibration is one of the fundamental problems in the open-pit mines and intense vibration can cause critical damage to structures and plants nearby the open-pit mines, especially to the final pit wall's stability. It is very important to study how to control vibration induced by blasting in the mitigation of negative effects of …
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Numerical study on spatial distribution of blast-induced …
Despite adopting controlled blasting methods such as smooth blasting, presplitting blasting etc., the occurrence of a damage zone in the final wall is inevitable. 4 As an important part of open-pits, the damage to the final wall poses a serious threat to the safety of mine slopes. 5 Therefore, studying and predicting the spatial distribution of ...
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Final Pit Wall Stability
This paper discusses the development of a strategy for ensuring long-term geotechnical stability of final pit walls at AngloGold Australia's Sunrise Dam Gold Mine. The strategy makes use of improved blasting techniques, changes to the mining sequence and other geotechnical techniques. Only the blasting techniques will be discussed in this paper. …
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Pit Slope Configuration for Open Pit Mining – A Case Study
From the analysis, multi-bench scale slope instability occurrence was found to be rare but single-double scale could be possible at the western wall of the planned pit with probability of failure of about 0.4. Presplit and trim shots perimeter blasting techniques are recommended to maintain the integrity of the final pit walls at certain areas.
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The Effectiveness of Pre-Splitting as a Method of Wall …
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.
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Understanding the connection between blasting and highwall stability …
The final feature of smooth wall blasting is that the smooth wall holes are initiated after the primary blast. Smooth wall blasting will allow blast damage to extend beyond the smooth wall line before they are initiated. ... The use of air decks in production blasting in an open pit coal mine. Geotech Geol Eng, 18 (2000), pp. 269-287. View in ...
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Study on blasting fragmentation mechanism of burnt rock in open-pit …
A large number of burnt rocks in some open-pit mines in Xinjiang, Inner Mongolia and Ningxia have a great influence on the blasting effect. For this kind of rock, through the analysis of physical ...
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A new methodology to predict backbreak in blasting operation
Backbreak is by far one of the most important types of breakage in opencast mining as it has profound effect on the final contours and wall stability conditions. …
WhatsApp: +86 18221755073
Final Wall Stability in Metal Open Pit Mines Using …
Implementing stable final pit walls in open pit mines during the open pit design phase and mine exploitation has become one of the most important concerns of mining engineers in recent years.
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Application of Computer Assisted Modelling to Final Wall Blast …
A recently-developed model is used as a tool to optimise the design of blasts used to create final walls in large open pit mines. The use of this tool has allowed present blasting practice and proposed designs to be evaluated to predict the likely extent of rock damage behind the final wall. The evaluation of the damage is dependent on the predominant …
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Final Wall Stability in Metal Open Pit Mines Using Presplit Blasting …
Importance of presplit drilling and blasting in open pit mines slope stability study is one of the most considerable parameter for safety and economical factors of open pit mines. failure of mines' walls can potentially cause loss of lives, roads blocking, damaging to mining machinery, temporarily or permanently halt production and in the worst case …
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Design of controlled blasting (pre-splitting) in …
Pre-splitting is a controlled blasting technique with applications in open pit mines. The main objectives of pre-splitting in open pit mining are: preventing/controlling back-break; controlling excessive …
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Modeling Study on Cumulative Damage Effects and Safety …
a Schematic diagram of blast-induced damage zone of the excavation slope; b the cumulative damage zone on the slope observed during site investigation after blasting in the open-pit final wall
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EVALUATING OPEN PIT HIGHWALL DIG COMPLIANCE
Buaba, Judith, "EV ALUA TING OPEN PIT HIGHWALL DIG COMPLIANCE" (2018). ... development of a mine are drilling and blasting of the rock mass and excavating the blasted ... approach the final pit ...
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Understanding the connection between blasting and …
The final feature of smooth wall blasting is that the smooth wall holes are initiated after the primary blast. Smooth wall blasting will allow blast damage to extend …
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Blasting near open pit walls
Blasting near open pit walls CK McKenzie 84 APSSIM 2016, Brisbane, Australia Open pit blasting must be considered as a mining process with well-defined customers, those being the excavator/truck fleet (pit productivity), the processing plant (plant productivity), and the geotechnical department (pit safety).
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Deformation and failure characteristic of open-pit slope …
Therefore, when approaching the final wall of an open-pit, control strategies, such as pre-splitting blasting, decoupled blasthole of explosives, placement of buffer …
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Evaluation and optimization of blasting approaches to reducing oversize
1. Introduction. At present, drilling equipment with 200-mm hole diameter and above is widely used in large open-pit mine. The blasthole diameter has significant effect on rock fragmentation, since it is the primary blast design parameter and has influence on the choice of burden, spacing, stemming length, etc. [1], [2], [3].In order to choose the …
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(PDF) Design of controlled blasting (pre …
Estimating the costs of blasting operations is an important parameter in open-pit mining. Blasting and rock fragmentation depend on two groups of variables. ... Table 1 Geometric parameters of pit no. 1, Golegohar …
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Final Wall Stability in Metal Open Pit Mines Using Presplit Blasting
Implementing stable final pit walls in open pit mines during the open pit design phase and mine exploitation has become one of the most important concerns of mining engineers in recent years. Failure of mine walls can potentially cause loss of life, roads blocks, and damage to mining machinery, temporarily or permanently halt …
WhatsApp: +86 18221755073
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 ...
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Continuous Monitoring and Improvement of …
The current techniques used for monitoring the blasting process in open pit mines are manual, intermittent and inefficient and can expose technical manpower to hazardous conditions.
WhatsApp: +86 18221755073
Modeling Study on Cumulative Damage Effects and Safety …
Drilling and blasting method used for excavation causes damage to surrounding rock mass, and frequent blasting often leads to cumulative damage effects. Thus, understanding the distribution of Blast-Induced Damage (BID) zone is critical to assess the slope stability of open-pit mines. Herein, this study aims to investigate the …
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Pit wall optimisation and effective wall management …
The majority of the west wall in the final pit is situated in these materials. The Black Flags Mudstone (BFM) which is the main ore-bearing rock. The bedding or foliation in this unit …
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