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Showing 1 to 17 of 17 for “"Tetrahedrite"”.
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The crystal chemistry of tetrahedrite
Tetrahedrite is the most common of the sulfosalt minerals and is one of the primary sources of silver in the world today. Although relatively simple structurally, the compositional complexity has hindered systematic investigations. Accordingly, three separate, but related, investigations were …
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New Approaches To Chalcogenide Materials For Thermoelectrics: Lead Telluride-Based Nanostructures And Facile Synthesis Of Tetrahedrite And Doped Derivatives
… (2) Develop a rapid, convenient synthesis of tetrahedrite (Cu12Sb4S13).</p> <p>Approach (1): Nanostructuring of PbTe and PbTe–PbS. Nanostructured PbTe and nanocomposites of PbTe–PbS are hypothesized to increase ZT by lowering thermal conductivity, while ligand stripping of PbTe NCs by sulfide …
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Trace element distributions and partitioning trends in hydrothermal base metal sulphide ores comprising sphalerite, galena, chalcopyrite and tetrahedrite-tennantite
… 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, yet should also be modified …
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Pyrite porphyroblast paragenesis at the Cherokee Mine, Ducktown, Tennessee
… magnetite (3 %) with minor galena, molybdenum, tetrahedrite, bismuth, ilmenite, and rutile. The ore body is interpreted to have been syngenetic and to have contained both primary pyrrhotite and primary pyrite: additional pyrite may have formed as crusty accretions resulting from oxidation of …
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Ore mineralogy and paragenesis of a portion of the Great Gossan Lead district, Virginia
… arsenopyrite, pyrite, cubanite, mackinawite, tetrahedrite, stannite, and native bismuth--are disseminated throughout the ores. Pyrite is locally common as corroded primary euhedrae in some are bodies. Sphalerite occurs as disseminated anhedral aggregates commonly containing oriented lamellae …
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Gold and Base Metal Mineralization, Hydrothermal Alteration and Vein Paragenesis in the Spring Valley Deposit, Pershing County, Nevada
… may host sphalerite-galena-gold ± chalcopyrite ± tetrahedrite mineralization. Crack-seal veins are generally earlier and are composed of elongate-blocky quartz ± pyrite, with late carbonate and tourmaline that formed previous to the crack-seal process. Non-directional quartz veins are composed of …
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Geology and geochemistry of the Bully Hill area of the East Shasta district, Shasta County, California.
… and replacement by galena + chalcopyrite + tetrahedrite-tennantite; (3b) replacement by chalcopyrite; and (4) replacement by barite. ΣSO₄⁼ and H₂S contents of hydrothermal fluids decreased from Stages 2a to 3a. δ³⁴S values of sulfides increased successively from Stages 1 (-15.8 per mil) to …
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Petrology and geochemistry of precious and base metal mineralization, North Amethyst vein system Mineral County, Colorado
… adularia, fluorite, base metal sulfides, and Ag-tetrahedrite. The first association (fluid boiling at >350°C to 270°C, <2 wt% HaCl equiv.) has a calculated depth of >1000m; the second association (nonboiling, basemetal assemblages: 280°C to 220°C, 5-11 wt%; boiling, quartz + fluorite + calcite: …
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Geochemistry and Petrography of Beartrack Mine, Lemhi County, Idaho
… from 10 to 307 ppm and are hosted in tennantite-tetrahedrite. Other important metals in the veins are galena and free gold. Primary fluid inclusion data from the base metal quartz veins yield two homogenization temperature ranges between 204-2160C and 241-2470C. Optically determined paragenetic …
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Volcanic stratigraphy and lithochemistry of the lower Jurassic Hazelton group, host to the Eskay Creek precious and base metal volcanogenic deposit
… and sulphosalt beds, dominated bysphalerite-tetrahedrite; the deposit includes massive, strata bound lenses of stibnite-realgar-cinnabar-arsenopyrite and underlying epigenetic mineralization. 21 Zone deposit foot wall rhyolite is part of a linear felsic flow dome complex several kilometers …
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A Comparison of Geochemistry, Carbonate Mineralogy, and Argillic Alteration between the Dome Prospect and the Main Au Resource of the Donlin Creek Project in Southwest Alaska
… hotite-sphalerite-chalcopyrite-pyrite-marcasite ± tetrahedrite stockwork veins. Relative vein ages exhibited in this study further subdivide and identify the vein assemblages currently logged in the resource area. Diagrams of trace elements obtained from LA-ICP-MS indicate four carbonate phases …
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Geochemistry and origin of the Asimotrypes carbonate hosted mesothermal gold deposit, Pangeon mountain, N. Greece
… sphalerite, galena, chalcopyrite, pyrrhotite, tetrahedrite-tennantite, marcasite, covellite and malachite. Gold is either refractory occurring mainly in arsenopyrite and to a lesser extent in Aspyrite, or free in the oxide minerals.<br/><br/>Three types of fluid inclusions (with subtypes) were …
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Metallogenesis of Cu deposits in Upper Palaeozoic sedimentary rocks, southern Ireland
… episodes are mainly syn-genetic chalcopyrite, tetrahedrite/tennantite, minor bornite and chalcocite. Re-Os geochronology measurements on molybdenite samples, associated with the vein hosted copper sulphides, reveal ages of 367.3 ± 5.5 to 366.4 ± 1.9 Ma (Upper Devonian, syn-basinal) for the …
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Characterization of the Gold Hill low-sulfidation epithermal Au-Ag vein system, northern Nye County, Nevada; Implications for continued discoveries in established mining districts
… abundant electrum- pyrargyrite- acanthite- Ag-tetrahedrite (freibergite)- pyrite± arsenopyrite. Economic stage III Au-Ag mineralization occurs above the base of the boiling zone (~260 m below sinter), as evidenced by abundant macroscopic Au-Ag minerals, and well-developed vigorous boiling …
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Time-Space Relationships between Sediment-Hosted Gold Mineralization and Intrusion-Related Polymetallic Mineralization at Kinsley Mountain, NV
… cores are surrounded by stibnite or tennantite-tetrahedrite, which are enveloped by arsenian-pyrite rims. Gold strongly correlates (correlation coefficient >0.5) with Ag, As, Hg, Sb, Te, and Tl. The ore-stage pyrite at Kinsley contrasts with ore stage pyrite in CTGDs, where the arsenian-rims are …
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Mineralogical characterization and paragenesis of the Cripple Creek deposit, Colorado
… stage of mineralization, 4) The formation of tetrahedrite-bearing quartz veins, 5) The growth of additional stages of trace element-poor and trace element-rich pyrite, confined purely fractures and veins that would later host gold telluride minerals, 6) The large-scale development of gold …
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Investigation of the Geology, Structural Setting and Mineralisation the Copper-Sulphide Deposits in the Messina Area, Limpopo Mobile Belt, South Africa
… tennantite, mollybdenite, cobaltite and tetrahedrite. This confirms that the Messina copper deposits had complex sulphide ore mineralisation that is typical of hydrothermal mode of ore mineralisation from a magmatic source. The study further establishes the paragenitic sequence of ore …