Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Coal Reserves"”.
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A Characterization and Determination of the Coal Reserves and Resources of Southwest Virginia
Coal mining and timber are the two primary industries supporting the people of Southwest Virginia. Coal mining has occurred for more than 100 years, but production has dropped since reaching a peak in 1990. In order to properly plan with remaining coal production a study was conducted to …
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Recoverable reserve estimation in multiple seam mines
A reliable estimate of minable coal reserves is essential for long-term planning and for conservation of energy resources. In the majority of the world's coalfields, seams are found on multiple horizons, and coal recovery may be significantly reduced depending upon the magnitude of seam …
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Investigating the rheological behavior of Witbank coal water mixtures
South Africa has large low-grade coal reserves. With the prospect of expanding its coal demands for exports and power generation, it is important that the beneficiation and transport of coal in the country are economical. The current mode of transporting coal has some drawbacks, which include …
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Pathways to adoption of carbon capture and sequestration in India : technologies and policies
… in the future, given India's reliance on coal power and the large coal reserves. The motivation for this dissertation is the need to ascertain the current situation and conditions relevant to carbon capture in India so as to help guide the processes to prepare for large scale adoption if …
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Fluidised bed gasification of high-ash South African coals : an experimental and modelling study
South Africa has large coal reserves and produces approximately 74% of its primary energy from coal. Coal gasification using moving bed gasifiers is one of the most important coal utilisation technologies, consuming ± 17.5% of locally produced coal. This study was motivated by the need to …
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Simulation and optimization of hot syngas separation processes in integrated gasification combined cycle
… an exciting approach for cleanly using abundant coal reserves of the world to generate electricity. The present state-of-the-art synthesis gas (syngas) cleanup technologies in IGCC involve cooling the syngas from gasifier to room temperature or lower for removing Sulfur, Carbon dioxide and …
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Forecast of Virginia coal production
This thesis provides a model for forecasting coal production rates in southwest Virginia. A multiple linear regression model is developed for the forecasting process. The model includes six independent variables: Virginia coal price times Virginia coal mining productivity (x₁), Virginia mining …
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The ghost city of China : a revitalization strategy for Ordos
… thousand people. Thanks to the discovery of huge coal and oil deposits, the city generated immense amounts of wealth and spent billions of dollars on urbanization. However, the fantasy did not stand long when the coal industry collapsed ten years later due to the price downturn.The new town was …
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Ground control ramifications and economic impact of retreat mining on room and pillar coal mines
As the coal reserves at shallow depths become exhausted companies have to develop deeper deposits and increase percentage extraction to maintain production levels. Total extraction for room and pillar mines can only be achieved by pillar extraction. The unsupported roof increases during pillar …
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The Effects of Backfilling on Ground Control and Recovery in Thin-Seam Coal Mining
A large percentage of Southern Appalachian coal reserves are located in seams less than 36" thick. As thicker and currently more mineable, deposits are exhausted, methods of underground thin-seam extraction will have to be developed. These methods must be capable of removing coal efficiently and …
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A history of Maamba coal mine and its socio-economic impact on Zambia, 1968-2010.
… examines the origins and development of Maamba Coal Mine and its socio-economic impact on Zambia. It demonstrates that although Ian Smith’s Unilateral Declaration of Independence (U.D.I) in Rhodesia, 1965 was the key driver in the development of commercial mining of coal in the country, the art …
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An analysis of the development, the problems and proposed statutory regulations for strip coal mining.
The days of the coal miner going deep into the ground with his pick and shovel are rapidly being replaced by the claimed safer practices of strip mining. National attention was focused on strip coal mining in the 1960's with emphasis on the Appalachian Region. Rapidly increasing electrical demands …
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Centrifuge modelling of permeability in a heterogeneous coal mine backfill sequence
… a favoured method for the extraction of the vast coal reserves in the Highveld of South Africa. Previously backfilled and restored open cast areas are generally zoned for agricultural uses, but with growing pressures on land use, such areas are increasingly being considered for the expansion of …
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Site Characterization, Sustainability Evaluation and Life Cycle Emissions Assessment of Underground Coal Gasification
Underground Coal Gasification (UCG), although not a new concept, is now attracting considerable global attention as a viable process to provide a "clean" and economic fuel from coal. Climate change legislation and the declining position of coal reserves (i.e., deeper and thinner seams) in many …
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Petrography, chemical composition, and stratigraphic setting of the coals of North-Central Missouri
… a core drilling program to learn more about the coals in north-central Missouri. The stratigraphic setting and chemical and petrographic characteristics of 43 complete samples of coal recovered from 13 diamond drill holes in the exploration program in north-central Missouri are major …
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NEW APPROACHES FOR MITIGATING ENVIRONMENTAL CONCERNS ASSOCIATED WITH COAL AND COAL COMBUSTION PRODUCTS
Currently, coal combustion plays an important role in meeting the energy needs of the United States. It is expected that the effective utilization of coal will be crucial for attaining energy independence for the nation in the next 25 to 30 years, if not longer. The United States burns about 20% of …