Overall requirements for an advanced underground coal extraction system

Underground mining systems suitable for coal seams expoitable in the year 2000 are examined with particular relevance to the resources of Central Appalachia. Requirements for such systems may be summarized as follows: (1) production cost; (2)miner safety; (3) miner health; (4) environmental impact; and (5) coal conservation. No significant trade offs between production cost and other performance indices were found

Estimation of capital costs for establishing coal mines in South Africa

Coal is one of the most abundant mineral resources in South Africa and it is predominantly used in electricity generation in the country. Of all the mineral resources in South Africa, development of coal resources attracted most of the financial investment between 2010 and 2013. Development of mining projects requires estimation of capital and operating costs in the early stages of the project’s life. Estimation of costs is an essential exercise that assists on deciding the future of mining projects. Despite all the investment in the South African coal mining sector, there is still little consistency in unit capital costs invested/required to develop coal mining projects. Lack of research within the area of coal mining projects’ costs is attributable to a lack of publicly available information. Research in this area will enable investors and operators in the coal mining sector to be able to assess financial viability early in the project life. This study reviewed coal mining projects across the world, looking at publicly available capital costs. The study further recognised similarities between the South African and Indian coal mining sectors thereby enabling the research to leverage data from the Indian coal mining sector to estimate capital costs in South Africa. The parametric estimating technique was used to estimate capital costs in this study. Finally, six formulae were initially developed to estimate the capital costs of establishing coal operations in South Africa. The six formulae were then reduced to three formulae by eliminating outliers. The formulae can be used to estimate capital costs to an error of magnitude error level of -30% to +50%. An estimation formula for underground longwall operation was not developed due to an insufficient number of underground longwall operations in both South Africa and India. In conclusion, this study recommends further research to develop more formulae which can be used to estimate capital costs more accurately

Demand Reduction and Responsive Strategies for Underground Mining

This thesis presents a demand reduction and responsive strategy for underground mining operations. The thesis starts with a literature review and background research on global energy, coal mining and the energy related issues that the mining industry face everyday. The thesis then goes on to discuss underground mine electrical power systems, data acquisition, load profiling, priority ranking, load shedding and demand side management in mining. Other areas presented in this thesis are existing energy reduction techniques, including: high efficiency motors, motor speed reduction and low energy lighting. During the thesis a data acquisition system was designed and installed at a UK Coal colliery and integrated into the mines existing supervisory control and data acquisition (SCADA) system. Design and installation problems were overcome with the construction of a test meter and lab installation and testing. A detailed explanation of the system design and installation along with the data analysis of the data from the installed system. A comprehensive load profile and load characterisation system was developed by the author. The load profiling system is comprehensive allows the definition of any type of load profile. These load profiles are fixed, variable and transient load types. The loads output and electrical demand are all taken into consideration. The load characterisation system developed is also very comprehensive. The LC MATRIX is used with the load profiles and the load characteristics to define off-line schedules. A set of unique real-time decision algorithms are also developed by the author to operate the off-line schedules within the desired objective function. MATLAB Simulation is used to developed and test the systems. Results from these test are presented. Application of the developed load profiling and scheduling systems are applied to the data collected from the mine, the results of this and the cost savings are also presented

Engineering linkages with the coal chain

"Industrial restructuring without parallel in recent British industrial history" is how the current Chairman of British Coal, Sir Robert Haslam, has described events in that industry. Since 1960 upwards of three quarters of a million jobs have gone in the deep coal mining industry alone. Numerous studies have analysed the underlying mechanisms behind the rapid decline of the nationalised coal industry, but hitherto little attention has been paid to the national linkage effects of that decline. This thesis is an attempt to analyse the consequences of industrial restructuring in coal mining on its UK engineering suppliers. In so doing, the thesis develops into much more than an empirical case study of industrial linkage and becomes a critical analysis of state capital-private capital relations. In particular, it focusses on the shifting boundaries of state ownership in the energy sector of the 'eighties. It considers what are the main processes involved and some of the consequences for those people and places most dependent on mining related jobs for their livelihoods

A Study of Mechanical Application in Demining

The GICHD Study of Mechanical Application in Demining is published after two years of research. The study puts the spotlight onto the use of machines as part of worldwide efforts to clear land mines. It looks at how machines work, the physical interaction between the machine tool, the ground struck, and the effects on the mines and UXO. The main roles for machines - potential for clearance, area reduction, and ground preparation - are explained, giving a description of each methodology, and illustrating these with actual case studies from the field. The study also deals with how machines can be utilized in a risk assessment and risk reduction process, provides basic guidelines for the protection of machine operators when working in a mined environment, and develops a way of measuring the cost-effectiveness of a machine via software provided. Among some of the main conclusions of the study are that some machines show the potential to be regarded as primary clearance systems, that the overall riddance of the mines problem could be greatly hastened by increased use of machines in area reduction, and that the use of magnets to reduce metal contamination as part of ground preparation can dramatically improve the efficiency of subsequent manual demining operations. The Study of Mechanical Application in Demining is a good starting point for anyone interested in learning about the potential for machines to improve and speed up the current, painfully slow process of mine clearance

A Study of Mechanical Application in Demining

The GICHD Study of Mechanical Application in Demining is published after two years of research. The study puts the spotlight onto the use of machines as part of worldwide efforts to clear land mines. It looks at how machines work, the physical interaction between the machine tool, the ground struck, and the effects on the mines and UXO. The main roles for machines - potential for clearance, area reduction, and ground preparation - are explained, giving a description of each methodology, and illustrating these with actual case studies from the field. The study also deals with how machines can be utilized in a risk assessment and risk reduction process, provides basic guidelines for the protection of machine operators when working in a mined environment, and develops a way of measuring the cost-effectiveness of a machine via software provided. Among some of the main conclusions of the study are that some machines show the potential to be regarded as primary clearance systems, that the overall riddance of the mines problem could be greatly hastened by increased use of machines in area reduction, and that the use of magnets to reduce metal contamination as part of ground preparation can dramatically improve the efficiency of subsequent manual demining operations. The Study of Mechanical Application in Demining is a good starting point for anyone interested in learning about the potential for machines to improve and speed up the current, painfully slow process of mine clearance

Integrated helicopter survivability

A high level of survivability is important to protect military personnel and equipment and is central to UK defence policy. Integrated Survivability is the systems engineering methodology to achieve optimum survivability at an affordable cost, enabling a mission to be completed successfully in the face of a hostile environment. “Integrated Helicopter Survivability” is an emerging discipline that is applying this systems engineering approach within the helicopter domain. Philosophically the overall survivability objective is ‘zero attrition’, even though this is unobtainable in practice. The research question was: “How can helicopter survivability be assessed in an integrated way so that the best possible level of survivability can be achieved within the constraints and how will the associated methods support the acquisition process?” The research found that principles from safety management could be applied to the survivability problem, in particular reducing survivability risk to as low as reasonably practicable (ALARP). A survivability assessment process was developed to support this approach and was linked into the military helicopter life cycle. This process positioned the survivability assessment methods and associated input data derivation activities. The system influence diagram method was effective at defining the problem and capturing the wider survivability interactions, including those with the defence lines of development (DLOD). Influence diagrams and Quality Function Deployment (QFD) methods were effective visual tools to elicit stakeholder requirements and improve communication across organisational and domain boundaries. The semi-quantitative nature of the QFD method leads to numbers that are not real. These results are suitable for helping to prioritise requirements early in the helicopter life cycle, but they cannot provide the quantifiable estimate of risk needed to demonstrate ALARP. The probabilistic approach implemented within the Integrated Survivability Assessment Model (ISAM) was developed to provide a quantitative estimate of ‘risk’ to support the approach of reducing survivability risks to ALARP. Limitations in available input data for the rate of encountering threats leads to a probability of survival that is not a real number that can be used to assess actual loss rates. However, the method does support an assessment across platform options, provided that the ‘test environment’ remains consistent throughout the assessment. The survivability assessment process and ISAM have been applied to an acquisition programme, where they have been tested to support the survivability decision making and design process. The survivability ‘test environment’ is an essential element of the survivability assessment process and is required by integrated survivability tools such as ISAM. This test environment, comprising of threatening situations that span the complete spectrum of helicopter operations requires further development. The ‘test environment’ would be used throughout the helicopter life cycle from selection of design concepts through to test and evaluation of delivered solutions. It would be updated as part of the through life capability management (TLCM) process. A framework of survivability analysis tools requires development that can provide probabilistic input data into ISAM and allow derivation of confidence limits. This systems level framework would be capable of informing more detailed survivability design work later in the life cycle and could be enabled through a MATLAB® based approach. Survivability is an emerging system property that influences the whole system capability. There is a need for holistic capability level analysis tools that quantify survivability along with other influencing capabilities such as: mobility (payload / range), lethality, situational awareness, sustainability and other mission capabilities. It is recommended that an investigation of capability level analysis methods across defence should be undertaken to ensure a coherent and compliant approach to systems engineering that adopts best practice from across the domains. Systems dynamics techniques should be considered for further use by Dstl and the wider MOD, particularly within the survivability and operational analysis domains. This would improve understanding of the problem space, promote a more holistic approach and enable a better balance of capability, within which survivability is one essential element. There would be value in considering accidental losses within a more comprehensive ‘survivability’ analysis. This approach would enable a better balance to be struck between safety and survivability risk mitigations and would lead to an improved, more integrated overall design

Bankfull and overbank flow in a straight compound channel with a graded sediment bed: degradational behaviour

Abstract available p. iv-