Papers by Emmanuel Chanda
Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2014
Artificial Neural Networks (ANN) have been applied to many interesting problems in different area... more Artificial Neural Networks (ANN) have been applied to many interesting problems in different areas of science, medicine and engineering and in some cases, they provide stateof-the-art solutions. This paper investigates the application of an ANN model in mining to predict the Drillability Index (DI) of a rock mass given rock parameters such as uniaxial compressive strength, shear strength, tensile strength, abrasion and hardness. Drillability indicates whether penetration is easy or hard while penetration rate indicates whether it is fast or slow. Therefore, prediction of the drillability and penetration rate is very important in rock drilling. Penetration rate is a necessary value for the cost estimation and the planning of the drilling project. According to results of this study, Uniaxial Compressive Strength (UCS) rating has the highest weight of 0.051083 among the three parameters studied which reconfirms the literature review finding which indicates that UCS is the most important parameter in predicting drillability.
Gospodarka Surowcami Mineralnymi-mineral Resources Management, Jul 26, 2023
Jabiru Metals completed a feasibility study on the Jaguar Base Metal Project in July 2005. The st... more Jabiru Metals completed a feasibility study on the Jaguar Base Metal Project in July 2005. The study was based on conventional truck haulage via a decline. Conveyor haulage was considered but not in sufficient detail to provide a meaningful comparison. The current study investigates the cost and productivity of alternative ore transport systems for the Jaguar project. The options considered are conventional underground truck, conveyor, road train, rigid frame truck, monorail haulage and shaft hoisting. Shaft hoisting was not considered in detail due to the high capital outlay for such a relatively short mine life of less than six years. This study goes beyond the common approach of evaluating haulage systems in isolation; it includes development costs, timing of ore production and costs associated with mine services as well as administration and milling costs. The results of this study indicate that the best haulage option for the Jaguar project is conventional truck using the Hitachi AH400 trucks. The net present value (NPV) for this option is A$8.13 million higher than the next best option namely the Kiruna E635 electric truck. The conveyor option has the lowest operating cost per tonne of ore but the longer development time negatively impacts on its NPV. The monorail option is considered impractical due to the number and length of trains required to achieve production targets
Tunnelling and Underground Space Technology, 2018
The advancement in tunnelling and underground space technologies and the need for large scale mon... more The advancement in tunnelling and underground space technologies and the need for large scale monitoring and communication systems for safe and efficient operations has triggered the era of wireless sensor networks (WSNs). The progress of WSNs have been associated with the innovation of sensor nodes with the more significant features of smaller size, more cost-effectiveness, lower latency and powerful antenna coverage. The sensor nodes arrangement in dense industrial WSNs is one of the crucial issues for a better quality of service and a reliable message transmission through the network. In this study, we investigate various sensor node arrangements of ZigBee networks for underground space monitoring and communication systems. The performance of ZigBee topologies are analysed in 12, 20, 30, 40 and 50-node scenarios for stationary node deployment in underground environments. The metrics used for the performance evaluation include throughput, packet delivery ratio (PDR), end-to-end delay, energy consumption and packet delivery security. The results evaluation confirms the mesh topology is prioritised in WSNs design considering higher throughput, packet delivery ratio and network security, while the cluster-tree topology is preferred in case of lower end-to-end delay and lower energy consumption. The analyses show that the mesh topology creates a more reliable monitoring and communication network with an adequate quality of service in underground spaces and tunnels. Therefore, greater end-to-end delay and energy consumption could not be major concerns for the mesh topology in underground mine applications based on the acceptable data latency and using mine power.
Journal of the Southern African Institute of Mining and Metallurgy, 2019
The accurate modelling of geometallurgical data can significantly improve decision-making and hel... more The accurate modelling of geometallurgical data can significantly improve decision-making and help optimize mining operations. This case study compares models for predicting copper recovery from three indirect test measurements that are typically available, to avoid the cost of direct measurement of recovery. Geometallurgical data from 930 drill core samples, with an average length of 19 m, from an orebody in South America have been analysed. The data includes copper recovery and the results of three other tests: Bond mill index test; resistance to abrasion and breakage index; and semi-autogenous grinding power index test. A genetic algorithm is used to impute missing data at some locations so as to make use of all 930 samples. The distribution of the variables is modelled with D-vine copula and predictions of copper recovery are compared with those from regressions fitted by ordinary least squares and generalized least squares. The D-vine copula model had the least mean absolute error.
This paper takes that several engineering examples of practical applications to introduce the 3-D... more This paper takes that several engineering examples of practical applications to introduce the 3-D roadway layout of stagger arrangement method with triangular coal pillars which arranges the air intake roadway and air return roadway in different horizons. It realizes the design theory transformation of roadway layout from 2D system to 3D system. And expanding the original working face 31111 in coal seam 2# of Zhencheng Mine as project background, the paper makes systematic analysis to the geological, technical and economic factors and applies this new mining roadway layout technology for raising coal recovery ratio and solving the problems of the full-seam mining in thick coal seam synthetically according to theoretical study and mining practice.
The need to develop innovative responses to the challenges posed by mining at depths below 600 m ... more The need to develop innovative responses to the challenges posed by mining at depths below 600 m has been recognised. The large excavations associated with current underground bulk mining practices are unlikely to be geotechnically and economically sustainable in these conditions. The heat load and airborne exhaust contaminants emitted by large diesel engines working at these depths can create unacceptable demands on mine ventilation systems resulting in substandard working conditions. This paper proposes the adaptation of existing monorail technology using continuous conductor technology to provide competitive haulage rates in substantially smaller access excavations at steeper grade that is currently achievable. It is additionally proposed that a suite of equipment can readily be sourced to enable development of these excavations supported by the monorail system. As a capital cost optimising approach it is suggested that the electrical conductors associated with the monorail form ...
ANZIAM Journal
This case study is a based on measurements made approximately at 20cm lengths along a down-the-ho... more This case study is a based on measurements made approximately at 20cm lengths along a down-the-hole diamond drill core from a pyrite mine in South Australia. The measurements are the P-wave velocity, magnetic susceptibility and impedance. The trivariate distribution is modelled using Gaussian, Student-t and vine copulas and the results are compared in terms of goodness of fit and differences in extreme values from distributions obtained by simulation from the copulas. The vine copula provides the best fit for the variables. Trivariate linear spatial Gaussian, Student-t and vine copulas are used to predict magnetic susceptibility one step below the depth of the drill core. The vine copula allows for more detailed modelling of the error structure, and so
Mining Science and Technology
Chanda, E.C.K., 1989. Evaluation of success probability in multiple seam room-and-pillar mining. ... more Chanda, E.C.K., 1989. Evaluation of success probability in multiple seam room-and-pillar mining. Min. Sci. Technol., 9: 57-73. A complete evaluation of multiple seam mining potential for any coal property requires the analysis of historical data and the controlling mining conditions. The major problem affecting multiple seam mining is interaction between workings in the contiguous seams. The success or failure of multiple seam mining can be evaluated using statistical techniques. A computer-based stepwise multiple regression algorithm is used to develop an equation for predicting the probability of success in two seam-mining situations. The model provides a measure of risk involved in mining multiple seams. The data used to develop the model are from a historical record of attempted multiple seam mining in the Eastern United States. The variables significantly influencing success or failure of multiple seam mining are percent sandstone in the interburden, ratio of interburden thickness to lower seam thickness, time delay, interburden thickness, thickness of both seams, depth of cover to upper seam, columnated pillars, columnated entries and the leading seam. The model developed was found to be quite satisfactory as a predictor of the probability of success within the range for which it was developed.
International Journal of Rock Mechanics and Mining Sciences
This paper introduces the Triple-section extraction process in the three-dimensional roadway layo... more This paper introduces the Triple-section extraction process in the three-dimensional roadway layout of stagger arrangement method for longwall top-coal caving mining. This 3-D roadway layout of stagger arrangement method without coal pillars, which arranged the air intake roadway and air return roadway in different horizons, realizing the design theory transformation of roadway layout from 2D system to 3D system. And the paper makes systematic analysis to the geological, technical and economic factors, applies this new mining roadway layout technology for raising coal recovery ratio and solving the problems about full-seam mining in thick coal seam synthetically according to theoretical study and mining practice. Furthermore, the paper presents a physical simulation about inner staggered roadway layout of this particular longwall top-coal caving method.
Proceedings of the 2016 2nd International Conference on Economics, Management Engineering and Education Technology (ICEMEET 2016), 2017
This paper takes that several engineering examples of practical applications introducing the 3-D ... more This paper takes that several engineering examples of practical applications introducing the 3-D roadway layout of stagger arrangement method without coal pillars, which arranged the air intake roadway and air return roadway in different horizons, realizing the transformation of roadway arrangement from 2D system to 3D system. And expanding the original working face 31111 in coal seam 2# of Zhencheng Mine as project background, the paper makes systematic analysis to the geological, technical and economic factors, applies this new mining roadway layout technology for raising coal recovery ratio and solving the problems about full-seam mining in thick coal seam synthetically according to theoretical study and mining practice. Stagger arrangement roadway layout system For both can be slice mining and can be an overall height of thick coal seam mining, the roadway layout of stagger arrangement method arranges the air intake section roadway and air return section roadway respectively in different layers of the thick coal seam, as shown in Fig. 1.
Transport Problems, 2016
Currently, conventional methods of decline development put enormous cost pressure on the profitab... more Currently, conventional methods of decline development put enormous cost pressure on the profitability of mining operations. This is the case with narrow vein ore bodies where current methods and mine design of decline development may be too expensive to support economic extraction of the ore. According to studies, the time it takes to drill, clean and blast an end in conventional decline development can be up to 224 minutes. This is because once an end is blasted, cleaning should first be completed before drilling can commence, resulting in low advance rates per shift. Improvements in advance rates during decline development can be achieved by application of the Electric Monorail Transport System (EMTS) based drilling system. The system consists of the drilling and loading components that use monorail technology to drill and clean the face during decline development. The two systems work simultaneously at the face in such a way that as the top part of the face is being drilled the pneumatic loading system cleans the face. However, to improve the efficiency of the two systems, critical processes performed by the two systems during mining operations must be automated. Automation increases safety and productivity, reduces operator fatigue and also reduces the labour costs of the system. The aim of this paper is, therefore, to describe automation designs of the two processes performed by the monorail drilling and loading systems during operations. During automation design, critical processes performed by the two systems and control requirements necessary to allow the two systems execute such processes automatically have also been identified. AUTOMATISIERUNGS-DESIGN FÜR MONORAIL-BASIERTE SYSTEMPROZESSE Zusammenfassung. Derzeit haben konventionelle Methoden der Abnahme Entwicklung enormen Kostendruck auf die Rentabilität der Bergbau. Dies ist der Fall mit engen Vene Erzkörper, wo aktuelle Methoden und Mine Design der Entwicklung des Rückgangs kann zu teuer sein, um die wirtschaftliche Extraktion des Erzes zu unterstützen. Studien zufolge kann die Zeit, die zum Bohren, Reinigen und Sprengen eines Endes in einer konventionellen Abnahmeentwicklung benötigt wird, bis zu 224 Minuten dauern. Dies liegt daran, dass, sobald ein Ende gestrahlt wird, sollte die Reinigung zuerst abgeschlossen werden, bevor das Bohren beginnen kann, was zu 30 B. Besa, K.E. Chanda, M. Kuruppu niedrigen Vorschüben pro Schicht. Verbesserungen bei den Fortschrittsraten bei der Entwicklung des Rückgangs können durch die Anwendung des Elektrohängebahnsystems (EMTS) erreicht werden. Das System besteht aus den Bohr-und Beschickung Komponenten, die Monorail-Technologie zu bohren und zu reinigen das Gesicht bei der Entwicklung des Rückgangs. Die beiden Systeme arbeiten gleichzeitig am Gesichtsfeld so, dass das pneumatische Ladensystem bei der Bohrung des Oberteils des Gesichts das Gesicht reinigt. Um jedoch die Effizienz der beiden Systeme zu verbessern, müssen kritische Prozesse, die von den beiden Systemen im Bergbau durchgeführt werden, automatisiert werden. Die Automatisierung steigert die Sicherheit und Produktivität, reduziert die Ermüdung des Bedienpersonals und reduziert gleichzeitig die Arbeitskosten des Systems. Das Ziel dieser Arbeit ist es daher, Automatisierungskonzepte der beiden Prozesse zu beschreiben, die von den Monorail-Bohr-und Beschickungssystemen während des Betriebs durchgeführt werden. Während des Automatisierungsentwurfs wurden auch kritische Prozesse identifiziert, die von den beiden Systemen durchgeführt wurden, und Kontrollanforderungen, die erforderlich sind, damit die beiden Systeme solche Prozesse automatisch ausführen können.
Zambian Journal of Applied Earth Sciences, 1991
Zambian Journal of Applied Earth Sciences, 1991
African Journal of Science and Technology Series a Technology, 1988
This paper describes a Wireless Sensor Network (WSN) for communication and monitoring systems in ... more This paper describes a Wireless Sensor Network (WSN) for communication and monitoring systems in underground mines. The study focuses on ZigBee wireless network and Geographic Information System (GIS) technologies to resolve some underground mine difficulties such as safety, traffic control, and scheduling. Hence, the achievements of integrating such technologies are mine management and safety improvement. In this research, we analysed the optimal arrangement of wireless sensors the basis of ZigBee network attenuation. The proposed system investigates the intensity of received signal strength indication (RSSI) between wireless sensors within ZigBee network. The measurements demonstrate different RSSI values in straight tunnel, curved tunnel, and muddy areas. The experimental results conclude a secure ZigBee wireless network to overcome mentioned difficulties in the underground environments.
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Papers by Emmanuel Chanda