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Showing 1 to 20 of 58 for “"epithermal"”.
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Mineral deposition in epithermal deposits formed through flash vaporization and implications for improved understanding of the Arista intermediate-sulfidation epithermal deposit in southern Mexico
Bonanza-type epithermal deposits are formed within hundreds of meters of the paleowater table. They typically consist of banded veins and associated breccia, with quartz being the dominant gangue mineral. Petrographic evidence suggests that much of the quartz in these veins formed through …
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Numerical hydrologic modeling of the Creede epithermal ore-forming system, Colorado
… of fluids involved in the genesis of the epithermal ores. From the large volume of data on the main period of mineralization, a well-constrained conceptual flow model has evolved. In this model, an intrusion at depth drove hydrothermal convection, and topography drove shallow groundwater …
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Design of a sodium-cooled epithermal long-term exploration nuclear engine
… and compact reactor core. The sodium- cooled, epithermal long-term exploration nuclear engine (SELENE) is designed to be scalable to meet many differing mission requirements. The SELENE core is a comprised of Nb-lZr clad, lead bonded, UC plates in a honeycomb pattern. The fuel plates are …
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Engineering design of a fission converter-based epithermal beam for neutron capture therapy
… a need for high intensity and low contamination epithermal neutron beams, for boron neutron capture therapy research and for routine treatment if this becomes a successful modality for treating cancers. A fission converter based design for high performance epithermal neutron beam was developed at …
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Construction and characterization of a fission converter based epithermal neutron beam for BNCT
… of a fission converter to produce a source of epithermal neutrons suitable for BNCT. The final design, construction and characterization of a new epithermal neutron beam is presented. A high intensity source with low contamination is obtained using a fission converter driven by thermal neutrons …
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Compact neutron sources for zero knowledge warhead verification via epithermal neutron transmission analysis
… information during measurement. Compact epithermal neutron sources enable the verification process to occur on-site and minimize the security risk of transporting special nuclear material to dedicated verification facilities. Experimental results demonstrate the feasibility of a …
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Paragenesis, fluid origin, and thermal history of a low-sulfidation epithermal gold-silver system
Samples of banded veins, microcrystalline quartz veins, and hydrothermal breccias +/- Au in the southern Castle Mountains, California were collected from four different zones within and up to 5 km outside the mine area in order to construct a paragenesis, interpret fluid origin, describe the …
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Magmatic-hydrothermal evolution of the Tuvatu alkalic epithermal Au-Telluride deposit, Viti Levu, Fiji
The Tuvatu deposit is a high-grade alkalic epithermal Au deposit in Fiji that consists of steeply dipping lode veins, flat lying lodes, and breccias hosted in alkalic intrusive and volcanic rocks. This study performed drill core logging of veins and alteration, vein sample petrography, and …
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Application of Fluid Inclusions and Mineral Textures in Exploration for Epithermal Precious Metals Deposits
… have been characterized in 855 samples from epithermal precious metals deposits along the Veta Madre at Guanajuato, Mexico. Features associated with boiling that have been identified at Guanajuato include colloform texture silica, plumose texture silica, moss texture silica, ghost-sphere …
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Evidence for rapid epithermal mineralization and coeval bimodal volcanism, Bruner Au-Ag property, NV USA
… underexplored Miocene-age Bruner low-sulfidation epithermal Au-Ag deposit are elucidated using field and laboratory studies. Bruner is located in central Nevada within the Great Basin extensional province, near several major volcanic trends (Western Andesite, Northern Nevada Rift) associated with …
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Integrated geological and geophysical interpretation of the epithermal gold deposit of Kubaka, Magadan region, Russia
Includes bibliographical references (pages 101-103).
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The structure of epithermal deposits of the Coromandel Peninsula : dynamic processes and three-dimensional strain
The many epithermal deposits of the Coromandel Peninsula, ('Hauraki volcanic zone') display a range of structural characteristics at a number of scales that illustrate the varied processes involved in their formation. Structural information synthesised from existing literature, including the theses …
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Spectral characterization of accelerator-based epithermal neutron beams for BNCT and BNCS using neutron activation foils
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1999.
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The design of an intense accelerator-based epithermal neutron beam prototype for BNCT using near-threshold reactions
… beam energy of 1.95 MeV and has a centerline epithermal neutron flux of 2.2 x 108 n/cm2-sec/mA, an advantage depth of 5.7 cm, an advantage ratio of 4.3, and an advantage depth dose rate of 6.7 RBE-cGy/min/mA, corresponding to an irradiation time of 38 minutes with a 5 mA beam. Moderator, …
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Geologic setting, Mineralization, and Detailed Underground Mapping of the Fire Creek Low-Sulfidation Epithermal Gold-Silver Deposit, Nevada
… Nevada Rift (NNR). This shallow, low sulfidation epithermal vein deposit is hosted in Miocene age volcanic rocks, intrusions, and volcaniclastic sediments. It occurs in a similar structural setting as the Mule Canyon low sulfidation epithermal gold and silver deposit, which is located 15.3 km …
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Epithermal neutron activation analysis of short-lived radionuclides using a pneumatic transport system and a pulsed D-T neutron generator
… embedded in a graphite monolith to produce epithermal activation products. The three radioisotopes of interest are palladium-107, palladium-109, and germanium-75. The experimental half-lives of each of the three isotopes, with the specific activity in parenthesis are: 21.82±3.71 (49.36 …
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Design and dosimetry of epithermal neutron beams for clinical trials of boron neutron capture therapy at the MITR-II reactor
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994.
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Fracture reactivation and gold mineralization in the epithermal environment : structural evolution of the Endeavour 42 gold deposit, New South Wales, Australia
… of an open pit mine at the Endeavour 42 (E42) epithermal gold deposit, situated in the Junee-Narromine Volcanic Belt of the Ordovician Macquarie Arc, central New South Wales, has provided a 3D view of the structurally controlled deposit which was hitherto not available due to the paucity of …
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The Improvement of Analytical Sensitivities for the Determination of Some Trace Elements in Airborne Particulate Matter by Epithermal Neutron Activation Analysis
Made available in DSpace on 2017-07-06T18:59:32Z (GMT). No. of bitstreams: 3 Wu_De_MS.pdf: 31317592 bytes, checksum: b9714d42b1ec202b034a2ef5092ba897 (MD5) Wu_De_MS_ABS.pdf: 616729 bytes, checksum: f8b28484609013b0973e5b2b15b2fef1 (MD5) license.txt: 4813 bytes, checksum: …
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