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 12 of 12 for “"Mine shafts"”.
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Evaluating water performance on platinum mine shafts using a benchmarking technique
… performance, and the sustainability of platinum mine shafts. Understanding water requirements and prioritizing effective management are therefore essential for operational resilience. Effective water management involves identifying inefficiencies, setting performance standards, and driving …
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Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides
… into the dynamics of skips in deep mine shafts have led to the identification of slamming as a phenomenon that results in exceptionally high forces in the shaft steelwork and conveyance. Slamming may occur when the rollers on the skip, that normally act on the guide, fail. Possible …
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Vibration problems of skips in mine shafts : the effect of compressive forces in the guides
… the vibration of conveyances in deep mining shafts have led to the identification of 'slamming' as a significant event in the initiation of large perturbations in the motion of the skip. Slamming occurs when the flexible rollers on the skip which normally act on the guides are inoperative. …
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Optimal location of mine shafts, The: an out-of-kilter technique for the solution of the fixed-charge problem
Includes bibliographical references.
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Optimal location of mine shafts, The: an out-of-kilter technique for the solution of the fixed-charge problem
Includes bibliographical references.
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Evaluation of strategies for rehabilitation of selected abandoned/historic mine sites in the Giyani Greenstone Belt, Limpopo Province of South Africa
… the country with a negative legacy of abandoned mines that present environmental problems, and public health and safety concerns. The common physical and environmental problems of most of these abandoned mines are associated with open shafts, unstable slopes of waste dumps and pits, and …
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Development Of Design Equations For A Square-tube Subbase Supporting A Shaft-mounted Speed Reducer
… as conveyor systems for transporting ore out of mine shafts. A subbase joins the reducer with an electric motor, and serves to limit the misalignment between the motor shaft and the reducer input shaft. The entire assembly is supported at two points: the axis of rotation of the reducer output …
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Determining the size and life of underground coal mines
The determination of mine design variables such as mine shaft locations, mine field dimensions, mine design capacity, and mine service life under various mining conditions is of primary importance to the economics of developing and subsequently operating an underground coal mine. However, the …
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Development of a computer-based advisory system for a selection of appropriate rehabilitation strategies for designated abandoned mine sites in Limpopo Province of South Africa
South Africa has many abandoned mines which seriously affect the environment and the livelihood of the host communities. The lack of in-depth knowledge of the problems of these mines, limited resources for their rehabilitation, lack of clearly assigned responsibilities for rehabilitation, and the …
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Geology and petrography of the Wellington Seam, Nanaimo Coalfield, Vancouver Island
… have hampered the efficient development of coal mines in the Wellington Seam. This study contributes to the assessment of the coal resources of the Nanaimo Coalfield by describing the geology, quality, petrographic composition and depositional origin of the Wellington Seam. Surface geological …
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Bioprospecting of plants species with potential to uptake inorganic chemical species from gold mine tailings and acid mine drainage
… This is due to the exposure of sulphide-bearing minerals such as pyrite (FeS2) to oxygenated water during and after the extraction of ore deposits which results in the formation of acid mine drainage (AMD). Acid mine drainage is characterised by low pH ranging between 1-4, high concentration of …