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 58 for “"hard rock"”.
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Cable support guidelines for underground hard rock mine operations
The objective of this thesis is to expand upon the existing database of cable support practice, and develop revised design criteria for the support of underground openings. A new empirical database of 46 supported case histories was assembled from a six month field study,involving visits to 13 …
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Novel methods for monitoring grout penetration in hard rock
… determine the location and shape of the grouted rock volume. This detectable grouting system has the potential to reduce the inefficiencies and uncertainties currently present in the grouting industry.
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Applications of Double-Difference Tomography for a Deep Hard Rock Mine
Seismicity at a deep hard rock mine can be a precursor to ground failure events. Seismicity data can be used in double-difference tomography, which produce tomograms showing velocity distributions in the rock mass that can be used to infer relative stress of the rock mass. The data set used for the …
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Marine Biodiversity of Antarctic Hard Rock Communities: Species Biomass and Energy Use
… seasonal study in the Antarctic of shallow water hard rock communities, including surveys to quantify biodiversity and biomass (Ash Free Dry Mass, AFDM). In addition temporal changes in biodiversity since 1998 were evaluated in the same location. To do this all benthic organisms greater than 3mm …
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Hard-Rock Miners of the Great Basin and Rocky Mountain West, 1860-1920
Made available in DSpace on 2014-12-13T20:25:31Z (GMT). No. of bitstreams: 1 7524269.pdf: 31518287 bytes, checksum: caa51324bfb17fd9bea573627222bd95 (MD5) Previous issue date: 1975
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Building, Updating and Verifying Fracture Models in Real Time for Hard Rock Tunneling
… govern the mechanical and fluid flow behavior of rock masses. Tunneling and other rock mechanics applications therefore require the characterization of rock fractures based on geological data. Field investigations produce only a limited amount of data from boreholes, outcrops, cut slopes, and …
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Seismic Wave Velocity Variations in Deep Hard Rock Underground Mines by Passive Seismic Tomography
… the mining workplace because the behavior of the rock mass associated with mining-induced seismicity is poorly-understood. Passive seismic tomography is a tool with which the performance of a rock mass can be monitored in a timely manner. Using the tool of passive seismic tomography, the advance …
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Poroelastic Calibration for Hydromechanically Coupled Numerical Discontinuum Models with Application in Low Permeability Hard Rock
… response the poroelastic response of the rock and flow through the intact rock can be incorporated into numerical models. This thesis provides a process to calibrate grain based poroelastic discontinuum numerical models which simulate the elastic response and fluid flow through low …
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Integrated mining, pre-concentration and waste disposal systems for the increased sustainability of hard rock metal mining
… and waste disposal functions into the hard rock metal mining system, prior to treatment by conventional grinding and flotation, is proposed as a novel interpretation of Mine-Mill Integration for improving the economics and environmental impact of exploiting deep, low-grade or otherwise …
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A hard kind of labor: an archaeological analysis of small-scale hard rock mines in northeast Washington
<p>Small-scale mines from the early 20th century are scattered across northeast Washington and specifically the Colville National Forest, but few have been investigated archaeologically. This thesis seeks to place one such mine, R306 Mining Camp, within its historical context and develop a more …
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Inhibition of iron-oxidizing bacteria in wastes from coal and hard-rock mines using the anti-bacterial agent
… was completed using a coal mine waste and a hard-rock mine waste. Eight columns containing 7kg of rock were established for each substrate. Three doses of NServe (22% nitrapyrine) were applied once at the beginning of this study: a high dose 2200 mg/kg, a medium dose 220 mg/kg, and a low dose …
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Monitoring-While-Drilling for Open-Pit Mining in a Hard Rock Environment: An Investigation of Pattern Recognition Techniques Applied to Rock Identification
… the abilities of artificial neural networks as rock classifiers in an open-pit hard rock environment using monitoring-while-drilling (MWD) data. Blast hole drilling data has been collected from an open-pit taconite mine. The data was smoothed with respect to depth and filtered for non-drilling …
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Investigation of factors governing the stability of stope panels in hard rock mines in order to define a suitable design methodology for shallow mining operations
… panels in shallow mines manifests itself as rockfalls from the hangingwall. Rockfalls from unstable stope panels vary in size from rockfalls between support units, to rockfalls spanning between pillars or solid abutments, to rockfalls bridging several panels and pillars. A suitable and …
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The hydrogeology of the Oman Mountains
… Semail nappe mantle sequence is the only other hard-rock formation of groundwater significance. Though much less productive than the carbonates, these ultramafics display extraordinary chemical activity, yielding bicarbonate waters from the weathered zone, whilst more deeply circulating …
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Experimental analysis of the post-failure behavior of coal and rock under laboratory compression tests
… is the Uniaxial Compressive Strength of the rock, which is commonly adopted as the standard strength indicator. However, in-situ behavior by past researchers have shown that rock and coal show significant residual strength contrary to the failure path observed in a conventional compression …
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Desulphurisation flotation for the selective removal of pyrite from coal discards using microorganisms
… and coal mining produce large amounts of waste rock and coal discards that contain significant quantities of sulphide minerals with Acid Rock Drainage (ARD) generating potential. ARD is caused by the exposure of sulphide minerals, primarily pyrite (FeS2), to both water and oxygen, and …
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Capital Mediators: American Mining Engineers in the U.S. Southwest and Mexico, 1850-1914
… were critical influences in bringing the hard-rock mining districts of North America into the economic system of the United States. By integrating the history of technical experts into the history of the transnational mining industry, my research contributes to an understanding of the …
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