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 20 of 26 for “"coal seam"”.
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Analysis and Application of Coal Seam Seismic Waves for detection of Abandoned Mines
It is not uncommon for underground coal mining to be conducted in the proximity of abandoned underground mines that are prone to accumulate water, methane or other toxic gases, and are often either poorly mapped or without good surface survey control. Mining into such abandoned voids poses a great …
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The chemical characterisation of authigenic carbonates from the Witbank no. 2 coal seam : environmental and diagenetic implications
… were identified associated with the no.2 coal seam in the Witbank basin. These are: l) cell-filling carbonate, 2) early formed spberulites, 3) massive carbonates, 4) cleat-filling carbonate, 5) fracture-filling carbonates and 6) carbonate cement of associated sands. The textural …
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Reflection of channel waves from obstructions in a coal seam with dissimilar roof and floor: numerical modeling, The
Includes bibliographical references (pages 180-182).
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Application of Time Series Analytics to Assess Performance of Artificial Lift Systems Deployed in Coal Seam Gas (CSG) Wells
… a crucial role in producing natural gas from Coal Seam Gas (CSG) wells in Australia. These systems are employed in over five thousand wells located in the Bowen and Surat Basins of Queensland. Operators face significant challenges in managing and maintaining ALS-supported production due to …
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Bacterial and chemical depression of pyrite in froth flotation of coal
… the pyrite sulfur and ash from pulverized coal samples of Illinois No. 6, Pittsburgh, and Middle Kittanning seams. In order to depress the coal pyrite in the flotation process, the coal samples were conditioned in "bacterial liquor." Iron oxidizing bacteria Thiobacillus ferrooxidans was …
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Reflection seismic data acquisition and processing for enhanced interpretation of high resolution objectives
… channel interruption of an upper Pennsylvanian coal seam (Herrin #6) in the Illinois basin. The data were reprocessed and interpreted by the Regional Geophysics Laboratory, Virginia Tech. Conventional geophysical techniques involving field acquisition and data processing were modified to enhance …
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Investigation into the applicability of AVO techniques to coal mine exploration
… and Sandstone roofs over a 6 meters thick coal seam, in the region of Daw Mill (UK). It moreover presents a modification of a triaxial cell aimed at calibrating AVO in the laboratory, and thereby improving the quality of AVO analysis in general. The analysis presented in this PhD thesis …
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Effect of sinkholes on soil moisture and ground water recharge at an abandoned underground coal mine near Wilton, North Dakota
… settings at an abandoned underground coal mine near Wilton, North Dakota. </p><p>Site stratigraphy consists of till overlying interbedded sands, silts, clays, and coal. The water table lies within or slightly above the coal seam mined at the site, at a depth of 40 to 110 feet, with the …
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Study on underground coal gasification combined cycle coupled with on-site carbon capture and storage
… formation. A technology coupling the underground coal gasification with carbon capture and storage (UCG-CCS) is proposed in this study to recover these lignite resources in North Dakota. The UCG-CCS system provides a cost-effective and environment-friendly approach to convert the lignite to …
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Isotopic composition of dissolved inorganic carbon in underground mine discharges of the northern appalachian basin
… and microbiological processes in underground coal mine discharges. Groundwater samples from mines in two different coal seams (the Pittsburgh and Upper Freeport) and three different hydrogeologic settings (fully flooded, partially flooded, and free draining) were compared. Twenty mine …
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Geological and structural analysis of the Hwange area-Northwest Zimbabwe: using remotely sensed data and geographic information systems (GIS)
… is a continuous need to locate more targets for coal exploration and evaluation of geological structures in the north-west coalfields in Zimbabwe. Conventional methods of analysing geological structures and field mapping are being hindered by inaccessibility of some areas and thick covers of …
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Coal mine waters in South Africa: Their Geochemistry,quality and classification. Volume one and two
… few water-scarce countries in the world in which coal mining has been, and still is, extensively performed. Parts of Australia and the U.S.A. (specifically Wyoming and Montana) are also water-scarce coal-mining regions. In the past, mining has impacted heavily on the South African environment …
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APPLICATION OF CONDITIONAL SIMULATION MODEL TO RUN-OF-MINE COAL SAMPLING FREQUENCY DETERMINATION AND COAL QUALITY CONTROL AT THE POWER PLANT (BLENDING, GOAL PROGRAMMING, MICROCOMPUTER).
Run-of-mine (ROM) coal sampling is one of the most important factors in determining the disposition of ROM coal for an overall emission control strategy. Determination of the amount of sample, or still better, the frequency of ROM coal sampling is thus essential to the analysis of overall emission …
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An experimental investigation of the creep behavior of an underground coalmine roof with shale formation
Stability of the roof in an underground coalmine is imperative for safe and efficient mining. Mining of the coal seam disturbs the natural equilibrium of the in-situ stresses in the surrounding rock. Because of the opening, the surrounding stratum deforms to fill the opening and return to the …
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Investigation of unstable failure in underground coal mining using the discrete element method
Unstable failure in underground coal mining is the sudden and violent ejection of coal from mine walls and pillars into the mine opening. This thesis demonstrates the use of the discrete element method to simulate stable and unstable modes of compressive failure of a western U.S. coal. Two discrete …
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Approaches to Fines Production in the Walloons Subgroup, Surat Basin, Queensland
… the root causes for fines generation in coal seam gas wells in the Walloons Subgroup of the Surat Basin, southeast Queensland, Eastern Australia. Fines production can be critical in causing erosion in downhole pumping equipment and disruption to surface facilities. The Surat Basin has, in …
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Coal mass rating with regards to outburst and coal burst
Outbursts and coal bursts pose significant risks to underground coal mine workers. The burst propensity of a coal seam is represented by the three factors of the burst triangle: coal, energy, and isotropic mass. The most critical factor was determined to be isotropic mass controlling the storage …
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Geomechanical behaviour and deformation of coal mine roof strata around faults: toward an engineering geological model
… mine planning and risk management in underground coal mines. In longwall mines in particular, evaluating and predicting geomechanical features and rock conditions ahead of mining is critically important because panel extraction is somewhat inflexible. Good longwall face conditions often depend on …
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Characterizing Trace Element Associations in the Pittsburgh No. 8, Illinois No. 6 and Coalburg Coal Seams
Coal preparation is widely regarded as a cost effective method for reducing the amounts of potentially hazardous air pollutant precursors (HAPPs) that occur as trace elements in the run-of-mine coals. Unfortunately, many existing coal preparation plants are inefficient in removing trace elements …
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Mechanisms of Microbial Methane Production from Sub-Bituminous Australian Coal
Biogenic methane production from coal necessarily involves a community of microorganisms acting in concert. The large, lignin-like molecules in coal cannot be metabolised by methanogens and other microorganisms are required to catalyse the breakdown of coal to acetate, hydrogen and carbon dioxide. …
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