Open pit mine slope failure

The bingham canyon mine is one of the largest openpit mines in the world, measuring more than 4 kilometers 2. Keyter synopsis there has been disappointingly little development in the analysis of rock slopes in open pit mines over the past 30 years. The niosh mining program has examined 1 design of augering patterns for safe mining of coal from highwalls has also been examined through numerical modeling, analytical and empirical techniques. New slope stability considerations for deep open pit mines. Kat katanga or the company today announces that at 06. This paper presents backanalyses of a failed slope at an open pit lignite mine in muara enim, indonesia. Small changes in the overall pit slope angle have large consequences on the overall economy of the mining operation. The importance of slope mo nitoring, and its place in the design and operation of an open pit mine are presented. Apr 15, 20 a massive slope failure has occurred at the open pit of the bingham canyon mine in utah. Consequences of an open pit slope failure can have significant safety andor economic impacts, and hence the slope designs can form a significant part of the risk assessment for an open pit mine. Created as an outcome of the large open pit lop project, an international research and technology transfer project on rock slope stability in open pit mines, this book provides an uptodate compendium of knowledge of the slope design processes that should be followed and the tools that are. This document presents an overview of risk management applied to open pit mining operations, with particular focus on geomechanics performance.

This document presents an overview of risk management applied to open pit mining operations, with particular focus on. Slope stability 2020 2020 international symposium on. In an advanced analysis, a slope failure in a pit can be accounted for as a result of a sudden collapse of unstable ground. The failed soil mass can move very quickly over large distances. Case study of slope failure during construction of an open pit mine in indonesia.

Perspectives on the prediction of catastrophic slope. Most of the mining activity is concentrated on open pit. Guidelines for open pit slope design is a comprehensive account of the open pit slope design process. Slope failures in large surface openpit mines represent a major challenge for the safety of mine operators and machinery which require longterm solutions. The rim of the open pit is at about 4,270 metres 14,010 ft. The challenges of openpit mining in the vicinity of the. Study on the process and mechanism of slope failure induced by.

In engineering projects associated with rock mechanic science like open pit mines, assessment and slope sta bility of mine walls is one of the important performance in generate of these structures. In light of the current covid19 situation, and in the best interest of public health and the global mining community, the acg 2020 international symposium on slope stability in open pit mining and civil engineering, 12 14 may 2020, will be delivered to symposium delegates via online media facilities, both live and on demand. Guidelines for open pit slope design, john read, peter. Estimating and knowledge of stable slope angle is one of main parts that should be occurring to special attention in open pit mines studies phase. Katanga mining announces geotech failure at kov open pit mine. Optimal system design for instrumented slope monitoring in. Zug, switzerland, march 8, 2016 katanga mining limited tsx. The bingham canyon mine, more commonly known as kennecott copper mine among locals, is an openpit mining operation extracting a large porphyry copper deposit southwest of salt lake city, utah, in the oquirrh mountains. Stability and movements of openpit lignite mines in.

Slope monitoring forms an integral part of slope management on open pit mines. The large open pit mine slope stability project addresses an industry wide need for improved knowledge of the mechanisms of rock slope failure. The slope, which was being raised by the dumping of excavated material, failed at a dump height of 24 m, well before reaching the design height of 80 m. The large scale geometry, that is the overall pit slope angles or the slope angles of individual bench stacks, is governed largely by the quality of the rockmass. Mining activities whether by open pit or underground methods bring about volumetric as well as stress and strain changes in the rock mass around a mine opening.

Katanga mining announces geotech failure at kov open pit. Some technical aspects of open pit mine dewatering by v. A massive slope failure has occurred at the open pit of the bingham canyon mine in utah. The slope angle varies between 7585, has been used as the case study. Pdf slope stability risk management in open pit mines. Openpit mines are deeper than ever before, and because rock mass strength at these large scales is difficult to evaluate, massive slope failure. Located about 30 kilometers 18 miles southwest of salt lake city, utah, the mine is a major producer of copper, gold, silver, and molybednum. It is new slope stability considerations for deep open pit mines by t. Evaluation of open pit mine slope stability analysis. Design of overall slope angle and analysis of rock slope. Open pit mine slope stability and uncertainty onepetro.

The bench height, bench face angle and berm width geometries must be. The research project is aimed at increasing the knowledge regarding large scale slope stability and to develop a design methodology for large scale open pit slopes, with special application to the aitik mine in. Analysis of a slope failure in an open pit mine using. With slope monitoring data, the failure was identified some months prior to failure and mining operations ceased in the area of concern. Paper open access numerical modelling of slope stability in. There are several factors that together contribute to open pit slope geometry. Because of the lag of the extension project, the section has slowly spread in the shape of v, and disasters such as landslides occur frequently. This article details how the sitemonitor system has been used as part of the slope monitoring. Slope design and implementation in open pit mines sciencedirect. It also illustrates the interface of slope designs with other aspects of the development of an open pit mine at the various stages, from the conceptual design stage into operation. Slope stability study for optimum design of an opencast project. An important aspect of the greek surface lignite mines relates to the stability of the. In the present work, a typical crosssection of openpit phosphate mine in eastern algeria, excavated with noncontinuous extracting methods excavators with trucks, the pit excavated to a depth of 75 m, the bench height 30 m and 10m of wide figure 2.

Slope monitoring did not reveal any movement in and around the pit. A dynamic earthquake analysis assesses potential for generation of excess porewater pressures in the ground or plastic deformation due to stressredistribution. Geotechnical considerations in open pit mines version 1. Slope failure incidents and other stability concerns in. University of technology concerning large scale slope stability in open pit mining.

A fine testament to the engineers who study rock and soil slope stability in the open pit mine context. Optimal system design for instrumented slope monitoring in open pit mines sanjive narendranathan 1 and hamid nikraz 2 1 engineer, coffey mining pty ltd 2 professor of civil engineering, curtin university of technology synopsis. May 05, 2019 case study of slope failure during construction of an open pit mine in indonesia. Monitoring systems, ranging from simple piezometers and extensometers to highly sophisticated radars and global navigation satellite systems, are employed to predict impending. Mar 08, 2016 katanga mining announces geotech failure at kov open pit mine.

Study of slope stability open pit mining, algeria springerlink. Rock excavation, safety analysis, slope stability, surface mining introduction the geotechnical study and slope design was conducted of an open pit copper mine 500 m long, 200 m wide situated in rajasthan, india. Created as an outcome of the large open pit lop project, an international research and technology transfer project on rock slope stability in open pit mines, this book provides an uptodate compendium of knowledge of the slope design processes that should be followed and the tools that. Dec 17, 2017 bingham canyon mine, the largest openpit mines in the world the bingham canyon mine, also known as the kennecott copper mine, is an openpit mining operation extracting a large porphyry copper.

The bingham canyon mine, more commonly known as kennecott copper mine among locals, is an open pit mining operation extracting a large porphyry copper deposit southwest of salt lake city, utah, in the oquirrh mountains. Analyses of a deep wall in an open pit mine in the peruvian andes are used to compare limit equilibrium methods slide with distinct element methods udec when the stability is controlled by rock mass strength. Pdf the issues concerned with slope stability in the open cast mines have come to forefront in the mining operations due to increasing pit depth. It provides information for detecting potentially unstable ground, assessing the performance of slope design which involves identifying any slope instability, andor failure mechanisms that develop. Nanfen openpit iron mine is the largest single openpit mine in asia. Slope failure open pit mine incident a slope failure involving an estimated 270,000 tonnes of rock occurred recently in an open pit mine. Where open pit mines are developed in dipping strata, a high footwall slope may result, which is usually designed with an angle equal or less steep than that of. Jul 12, 2017 as the mining method is turning from open pit mining to sag by mining, the vertical height of open pit mine slope continues to increase, the slope deformation and failure mode has close relationship with regional geological structure characteristics and the rock mass structure feature, the stability is influenced largely by rock mass, joints and fissures, and blasting vibration qiao and li 2004. Paper open access numerical modelling of slope stability. In all cases in open pit mining practice more than 40% of slope instability risks depend on groundwater conditions in the slope, to prevent slope failure, effective.

Slope monitoring solution for open pit mines ee publishers. Slope stability study for optimum design of an opencast. As the mining method is turning from open pit mining to sag by mining, the vertical height of openpit mine slope continues to increase, the slope deformation and failure mode has close relationship with regional geological structure characteristics and the rock mass structure feature, the stability is influenced largely by rock mass, joints and fissures, and blasting vibration qiao and li 2004. Mining under an open pit slope results in the collapse and slide of the slope. Therefore the mitigation of slope failure risk is still a topic of great concern, especially in openpit mines excavated through hard rock masses.

The application of such a system at the nanfen iron open pit mine in china is presented, where a novel technique for monitoring sliding. In 1996 a slope failure occurred at the round hill open pit mine, operated by macraes mining company ltd. Pdf evaluation of open pit mine slope stability analysis. An unusual slope failure mechanism at palabora richard k. Surface mining planning and design of open pit mining. Mar 20, 2010 textbook example of footwall failure collapse in a coal mine on a previously unidentified fault plane. On 10 april 20 rio tintos bingham canyon openpit copper mine experienced what we understand is the worlds largest ever inpit slope failure. In the incident of the tomeas 6 mine failure surface along a thin clay layer and in the two incidents of the choremi mine failure surface at the interface between lignite and an underlying clay, the linear surface crossed the excavation at the toe of the pit. This material is intended for use in lectures, presentations and as handouts to students, and is provided in power point format so as to allow customization for the individual needs of course instructors. All geometrical pit slope elements referred to here are illustrated in figure 1.

Bingham canyon mine, the largest openpit mines in the. Permission of the author and publisher is required for any other usage. Wedge failure analysis of the structural data set to identify the volumes of. On the monitoring and earlywarning of brittle slope failures in hard. Slip or failure zone is a thin zone of soil that reaches the critical state or residual state. Slope movement, coal open pit, slope monitoring, slope stability, landslide. Particularly, openpit mines productive blasting vibration and rainfall has an important effect on the mine slope stability. Bingham canyon mine, the largest openpit mines in the world the bingham canyon mine, also known as the kennecott copper mine, is an openpit mining operation extracting a large porphyry copper. The value of the results is enhanced by the fact that slope types of very different nature are considered, specifically. Monitoring systems for warning impending failures in slopes.

Textbook example of footwall failure collapse in a coal mine on a previously unidentified fault plane. A slope failure adjacent to a roadway is shown in figure 16. Slope stability is a critical safety and production issue for mining. Chengdu university of technology, chengdu 610059, china.

Bingham canyon mine, the largest open pit mines in the world the bingham canyon mine, also known as the kennecott copper mine, is an open pit mining operation extracting a large porphyry copper. Puncak jaya is the high point of the snowcovered ridge to the east of the mine. Since 10 fatalities due to one slope failure in april 2001, pit slope management strategy at kcm nchanga open pit nop has been based on slope stability radar for generation of slope performance indicators for management response. Slope stability 2020 2020 international symposium on slope. The failure as shown in figure 1, involved three benches at an intermediate slope that was being pushed back towards the final high wall location. Guidelines for open pit slope design, john read, peter stacey. Slope monitoring forms an integral part of slope management in openpit mines. The slope in which the failure occurred had been extensively cable bolted. This will enable the delegates to conveniently access the latest.

Introduction slopes of mines and quarries, some of which may reach several hundred meters deep, must be regarded as geotechnical works in the sense that we speak of mine works or civil engineering works. The slope stability in open pit mines is an extremely complex issue that requires a special approach. Massive slope failure at an open pit gold mine did not cause any injuries or accidents, but did cause significant production problems and high costs. The peak is at 4,884 metres 16,024 ft above sea level. Risk management geomechanics application for open pit slope. Numerical simulation analysis of npr anchorage monitoring. The mavropigi mine has been mined since 2003 and at present the excavated slopes have reached depths. Mine water risk in open pit slope stability springerlink. Introduction slopes of mines and quarries, some of which. A typical mode of slope failure in op en pit mines.

The bingham canyon mine is one of the largest open pit mines in the world, measuring more than 4 kilometers 2. Case study of slope failure during construction of an open. Analysis of a slope failure in an open pit mine using tslope. Early detection of impending slope failure in open pit mines using spatial and temporal analysis of real aperture radar measurements proceedings of the 20 international symposium on slope stability in open pit mining and civil engineering, slope 20.

Surface mining planning and design of open pit mining 1. Abstract slope stability in open pit mining industry is one of the important issues at this time given that most mining companies in indonesia to increase. The project focuses on the relationships between rock mass strength and deformability. A number of mines, where slope movement is detected, operate safely with the help of monitoring. Slope failures in large surface open pit mines represent a major challenge for the safety of mine operators and machinery which require longterm solutions. Major wall failure can occur seemingly without any visual warning, causing loss of lives, damage to equipment, and disruption to the mining process. Perspectives on the prediction of catastrophic slope failures. A case in particular is the aitik open pit mine in northern sweden, which currently faces the design of the overall slope angles for continued mining toward a depth of around 500 meters. The mine is the largest manmade excavation in the world and is considered to have produced more copper than any other mine in history more than 19 million tons. Due to the variety of factors that can a ect the safety of open pit mining operations, proper maintenance with proper monitoring and prediction tools is necessary.