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Showing 1 to 20 of 71 for “"Galena"”.
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Electrochemical studies of pyrite and galena
… photocurrent measurements were also conducted on galena for comparison with pyrite. The results indicate that galena samples from the same cluster have varying semiconducting properties, ranging from nearly intrinsic to highly n-type. Abrasion introduces defects in the surface of pyrite and …
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Instrumentation and Dynamic Characterization of the Galena Creek Bridge
The Galena Creek Bridge is a concrete arch bridge that was completed in 2012 as part of the I-580 freeway in Northern Nevada. The research in this report covers the instrumentation and in-field experiments conducted to characterize the dynamic properties of the structure in its baseline condition.A …
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Influence of grain size, morphology and aggregation on galena dissolution
The acidic, non-oxidative dissolution of galena nanocrystals has been studied using both microscopic and wet-chemical methods. The effects of particle size, shape, aggregation state, and grain proximity on dissolution rates were investigated. Nearly monodisperse galena nanocrystals with an average …
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The rates of oxidation of galena and sphalerite in acidic ferric chloride solutions
… system to determine the oxidation rates of galena and sphalerite under conditions similar to that expected in a weathering ore deposit . The specific surface area of the run solids was determined by N₂ BET procedure and the surface textures observed by SEM. The amount of Fe³⁺ converted to …
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Fluid Inclusion Evidence for Ore-Forming Solutions: Phoenixville, Audubon and New Galena Mine Districts, PA
<p>The Audubon, Phoenixville and New Galena Pb-Zn-Cu vein deposits of southeastern Pennsylvania have been investigated by microthermometric analysis of fluid inclusions in sphelerite, dolomite and quartz. The results obtained from primary and pseudosecondary inclusions in spherelite indicate that …
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Thermodynamic and kinetic studies of galena in the presence and absence of potassium ethyl xanthate
… E<sub>h</sub> and pH on xanthate uptake by the galena surface have been presented for the first time. These are particularly useful because they can be directly compared to observed flotation data. The results of voltammetry, IGP and potential-step experiments suggest that the oxidation of …
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Stratigraphy sedimentation and petroleum possibilities of the Middle Ordovician (Kimmswick-Galena) rocks of Missouri, Illinois and Iowa
… studies of the Kimmswick Limestone and the Galena Formation of Middle Ordovician age in eastern Missouri, western Illinois, and southeastern Iowa were conducted in order to examine their stratigraphic relations, geological history, environment of deposition, and petroleum possibilities.</p> …
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Surface Reactivity and Dissolution Rate of Galena: Potential Impact of CO2 Leakage from Geological Carbon Sequestration on Groundwater Quality
Geological carbon sequestration is one promising solution to mitigating CO2 emissions and curtailing global
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Trace element distributions and partitioning trends in hydrothermal base metal sulphide ores comprising sphalerite, galena, chalcopyrite and tetrahedrite-tennantite
… can be incorporated into natural sphalerite, galena, chalcopyrite and tetrahedrite-tennantite are determined, as are the preferred equilibrium trace element partitioning trends among these sulphides. The previously documented coupled substitution Ag⁺+(Bi, Sb)³⁺↔2Pb²⁺ in galena is confirmed, …
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The electronic structure of galena and hematite surfaces: applications to the interpretations of STM images, XPS spectra and heterogeneous surface reactions
… scanning tunneling spectroscopy (STS) spectra of galena (PbS) and hematite (a-Fe203) were calculated using ab-initio methods in order to interpret experimental images and spectra that were taken in previous studies. These calculations have helped to understand which states of the mineral surfaces …
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Carbonate Microfacies, Depositional Environments and Diagenesis of the Galena Group (Middle Ordovician) Along the Mississippi River (Iowa, Wisconsin, Illinois and Missouri), United States
… from six field sections and four cores of the Galena Group.
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The characterisation of the lead flotation circuit at Black Mountain Mining (Pty) Ltd. using the floatability component model approach
… operation that has been producing chalcopyrite-, galena- and sphalerite-bearing concentrates for over 30 years. Silver is recovered in the concentrates as a result of elemental substitution within the crystal lattice of chalcopyrite and galena minerals. The primary objective of this study was to …
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Developing a relationship between ore feed grade and flotation performance
… considered two synthetic ores; pyrite-based and galena-based synthetic ores. Pyrite and galena were chosen because they are widely studied in the flotation of sulphide ores. Each synthetic ore was analysed in isolation using the same experimental approach to better understand the behaviour(s) of …
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Paleoecology and Systematics of the Echinoderm Faunas of the Middle-Ordovician Platteville and Lower-Galena Groups of North-Central Illinois and South-Central Wisconsin
Made available in DSpace on 2014-12-11T18:10:06Z (GMT). No. of bitstreams: 1 7412074.pdf: 8939592 bytes, checksum: f091b514718b3cf29bd4cee19a1224ff (MD5) Previous issue date: 1973
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Geodynamic Evolution of the Aegean Back-arc and its Implication for Associated Precious and Base Metal Mineralization
… and isotopic analyses (Pb, Sr, δ34S and δ18O) of galena (PbS) and ore-associated hydrothermal barite (BaSO4). New galena Pb isotope data complemented by Pb isotope data of galena from the literature exhibit a range of isotopic ratios, with a resolvable geologic pattern. Galena from deposits in the …
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A thermochemical study of the ore deposits of the Milliken mine, New Lead Belt, Missouri
… The major mineralogy is simple, predominately galena, luminescent hydrothermal dolomite, sphalerite and chalcopyrite. Twenty-three additional minerals have been identified in the ores, including barite and Pb-aragonite, bot h of which have not previously been recognized in the district.</p> …
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The timing, composition, and source of subsurface diagenetic waters responsible for sulfide and carbonate mineralization in solution cavities of the ordovician galena group limestone, North Aurora, Illinois, USA
… Wise Lake Formation limestone of the Ordovician Galena Group. On the basis of plane-light and cathodoluminescent petrography and scanning electron microscopy, a series of repeating diagenetic events are identified within the cavities consisting of dissolution followed by marcasite, pyrite, and …
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Petrology and mineralogy of certain portions of the Fredericktown deposits
… predominate. However, some sulphides, especially galena, occur in form of veinlets and other cross-cutting structures. Disruption features often contain galena, and transitions from these to complete brecciation of the monogenic type exist. Galena also exhibits diagenetic recrystallization as well …
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Considering the Action of Degrading Water Quality on the Electrochemical Response of Sulphide Minerals
… of sodium ethyl xanthate onto chalcopyrite and galena. Synthetic plant water (SPW) was used to mimic the composition of recycled process water. The synthetic plant water used in this study comprised of single salt solutions to isolate the effects of the ionic species of interest which were Cl- , …
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