Limiting Blast-induced Damage On Final Pit Walls
Controlling damage by designing pit-wall geometries that are more robust to blasting along the final wall. Controlling damage by using accurate electronic delay detonators to prevent non-sequential firing in production blasts …
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Final Wall Stability in Metal Open Pit Mines Using Presplit …
This paper aims to illustrate the technical aspects of use of the successful presplit blasting method in metal open pit mines. It also shows that using this approach not only …
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A Methodology for Assessing the Impact of In Situ Fractures …
Drilling and blasting is the conventional method used for rock fragmentation in open pit mining. Blast-induced damage can reduce the level of stability of benches and pit slopes. To develop an optimal blast design, an adequate knowledge of the rock properties and in situ fractures is needed. Fractures are generally the paths of least resistance for explosive energy …
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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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Design of openpit mining | PPT
2) Conceptual mine planning including pit layout, equipment selection, and modifications or optimization. 3) Detailed steps in the design process such as studying exploration data, setting final pit limits, developing …
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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 as a vent for the explosive …
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Pit wall optimisation and effective wall management strategies …
Abstract: The requirements for open pit wall optimisation are often reliant on the drive for maximum ore extraction while maintaining the stability of the individual benches and overall slopes. In a very basic sense, slope optimisation can mean increasing the slope angles and/or bench heights and deepening of the pit against the original design with an objective to integrate …
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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 production at the face and in the worst …
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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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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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Modeling Study on Cumulative Damage Effects and Safety …
The cumulative damage effects on the final wall of the open-pit under blasting are investigated. A model coupled with tensile damage and Drucker-Prager yield criteria is …
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Blast induced damage mechanism on final walls and the …
Steep stable and safe pit walls can be formed by accurate final wall drilling and blasting techniques. The violence of the blasting process both leaves damaged surfaces that must be …
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Surface mining planning and design of open pit mining
2. Outline of Topic 6: 1) Definition of Open pit Mining Parameters: 1.1.) Basic Concept 1.2) Open pit Mining method 1.3) Bench 1.4) Open Pit Bench Terminology 1.5) Bench height 1.6) Cutoff grade 1.7) Open Pit Stability: i) Pit slope ii) Pit wall stability iii) Rock strength iv) Pit Depth v) Pit diameter vi) Water Damage vii) Strip Ratio (SR) 1.8) Open-pit mining sequence …
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Open Pit Mining
Open pit mining method is one of the surface mining methods that has a traditional cone-shaped excavation and is usually employed to exploit a near-surface, nonselective and low-grade zones deposits. It often results in high productivity and requires large capital investments, low operating costs, and good safety conditions. The main topics that will be discussed in this …
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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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Delay time optimization in blasting operations for …
Xinqiao Mining Co., Ltd has an open-pit mine with 4 million ton Pyrites production p.a. At present, the final pit walls with about 200 m height have occurred.According to the mining project, the height of the slope will increase to 400 m or above when the open-pit mine will be closed.Pre-splitting blasting has almost not been adopted near the final pit walls during mining …
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International Journal of Rock Mechanics and Mining …
southeast slope of the final wall of the open-pit mine, extending from the bench at EL 690 m to the bench at EL 810 m, with a horizontal length of about 1 km and a vertical height of 120 m (Fig. 3).
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Controlled blasting in an open-pit mine for improved slope …
A case study is presented where a controlled blasting programme (presplitting) was adopted in an open-pit copper mine in order to improve the stability of the resulting cut slopes. The aim was to reduce over break and minimize damage to the final pit walls from production blasts. The use of presplitting allowed considerably higher benches to be adopted with much steeper overall …
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Presplitting blasting
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; …
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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. ... Final Wall Stability in Metal Open Pit Mines Using Presplit Blasting Kazem Oraee. Ali Mozafari.
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Design of controlled blasting (pre-splitting) in …
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
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Wall Control Blasting Practices at Kısladag Gold Mine
This paper presents the final wall blasting practices at Eldorado Kisladag Gold Mine in Turkey. ... A Systematic Geotechnical Mapping Method for Underground and Open Pit Mines. 7th Australia -New ...
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Presplitting blasting
This technique is especially effective in back-break control through providing a separating surface between the main blasting pattern and open pit final walls (Dindarloo et al., 2015). Achieving a solid backbreak is essential for preserving wall stability and maximising blasting efficiency in mining operations.
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Deformation and failure characteristic of open-pit slope …
Moreover, deformation was mainly distributed near the final wall and extended to a certain depth into the pit slope (2– 2.5 bench height), and the maximum value was concentrated on the bench face. ... The contribution of mining blasting to open-pit failure is demonstrated from the perspective of FDM modeling (Fig. 11, Fig. 12). Although the ...
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OneMine | Wall Control Blasting in Open Pits
The recent increase in size of open-pit mining operations has resulted in major improvements in efficiency that are beneficial to the mining industry. Higher bench heights, larger diameter blast-holes, and more powerful explosives have played an important part in reducing mining costs. These measures have, however, resulted in increased energy concentrations in the blast area, …
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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 scenario closing the mine. Production and ...
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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 local geology.
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Blasting near open pit walls
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 …
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(PDF) Deformation and failure characteristic of open-pit …
However, limited studies have been conducted on the deformation behavior of open-pit slopes subjected to the combined effects of mining blasting and rainfall infiltration.
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Chapter Open Pit Mining
overburden and tailings (waste) at a specified disposal site outside the final pit boundary. Open pit mining is used for the extraction of both metallic and nonme- ... blasting, and haulage) are cyclical. This is true for hard rock overburden which must be drilled and blasted first. An exception to the cyclical effect is dredging
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