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Academic literature on the topic 'Metal sulphides'

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Published: 4 June 2021
Last updated: 6 September 2023

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Journal articles on the topic "Metal sulphides"

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Barnes, Sarah-Jane, M. L. Zientek, and M. J. Severson. "Ni, Cu, Au, and platinum-group element contents of sulphides associated with intraplate magmatism: a synthesis." Canadian Journal of Earth Sciences 34, no. 4 (April 1, 1997): 337–51. http://dx.doi.org/10.1139/e17-030.

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The tectonic setting of intraplate magmas, typically a plume intersecting a rift, is ideal for the development of Ni – Cu – platinum-group element-bearing sulphides. The plume transports metal-rich magmas close to the mantle–crust boundary. The interaction of the rift and plume permits rapid transport of the magma into the crust, thus ensuring that no sulphides are lost from the magma en route to the crust. The rift may contain sediments which could provide the sulphur necessary to bring about sulphide saturation in the magmas. The plume provides large volumes of mafic magma; thus any sulphides that form can collect metals from a large volume of magma and consequently the sulphides will be metal rich. The large volume of magma provides sufficient heat to release large quantities of S from the crust, thus providing sufficient S to form a large sulphide deposit. The composition of the sulphides varies on a number of scales: (i) there is a variation between geographic areas, in which sulphides from the Noril'sk–Talnakh area are the richest in metals and those from the Muskox intrusion are poorest in metals; (ii) there is a variation between textural types of sulphides, in which disseminated sulphides are generally richer in metals than the associated massive and matrix sulphides; and (iii) the massive and matrix sulphides show a much wider range of compositions than the disseminated sulphides, and on the basis of their Ni/Cu ratio the massive and matrix sulphides can be divided into Cu rich and Fe rich. The Cu-rich sulphides are also enriched in Pt, Pd, and Au; in contrast, the Fe-rich sulphides are enriched in Fe, Os, Ir, Ru, and Rh. Nickel concentrations are similar in both. Differences in the composition between the sulphides from different areas may be attributed to a combination of differences in composition of the silicate magma from which the sulphides segregated and differences in the ratio of silicate to sulphide liquid (R factors). The higher metal content of the disseminated sulphides relative to the massive and matrix sulphides may be due to the fact that the disseminated sulphides equilibrated with a larger volume of magma than massive and matrix sulphides. The difference in composition between the Cu- and Fe-rich sulphides may be the result of the fractional crystallization of monosulphide solid solution from a sulphide liquid, with the Cu-rich sulphides representing the liquid and the Fe-rich sulphides representing the cumulate.
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Vikentyev, Ilya, Olga Vikent’eva, Eugenia Tyukova, Maximilian Nikolsky, Julia Ivanova, Nina Sidorova, Dmitry Tonkacheev, et al. "Noble Metal Speciations in Hydrothermal Sulphides." Minerals 11, no. 5 (May 3, 2021): 488. http://dx.doi.org/10.3390/min11050488.

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A significant part of the primary gold reserves in the world is contained in sulphide ores, many types of which are refractory in gold processing. The deposits of refractory sulphide ores will be the main potential source of gold production in the future. The refractory gold and silver in sulphide ores can be associated with micro- and nano-sized inclusions of Au and Ag minerals as well as isomorphous, adsorbed and other species of noble metals (NM) not thoroughly investigated. For gold and gold-bearing deposits of the Urals, distribution and forms of NM were studied in base metal sulphides by laser ablation-inductively coupled plasma mass spectrometry and by neutron activation analysis. Composition of arsenopyrite and As-pyrite, proper Au and Ag minerals were identified using electron probe microanalysis. The ratio of various forms of invisible gold—which includes nanoparticles and chemically bound gold—in sulphides is discussed. Observations were also performed on about 120 synthetic crystals of NM-doped sphalerite and greenockite. In VMS ores with increasing metamorphism, CAu and CAg in the major sulphides (sphalerite, chalcopyrite, pyrite) generally decrease. A portion of invisible gold also decreases —from ~65–85% to ~35–60% of the total Au. As a result of recrystallisation of ores, the invisible gold is enlarged and passes into the visible state as native gold, Au-Ag tellurides and sulphides. In the gold deposits of the Urals, the portion of invisible gold is usually <30% of the bulk Au.
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Smyk, Mark C., and David H. Watkinson. "Sulphide remobilization in Archean volcano-sedimentary rocks and its significance in Proterozoic silver vein genesis, Cobalt, Ontario." Canadian Journal of Earth Sciences 27, no. 9 (September 1, 1990): 1170–81. http://dx.doi.org/10.1139/e90-124.

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The Archean volcano-sedimentary succession at Cobalt, Ontario, consists mainly of submarine andesitic flows and turbiditic interflow sedimentary rocks. Steeply dipping faults and large-scale, tight to isoclinar folds have developed in these basement rocks. The faults commonly host silver-vein-bearing structures that extend upward into overlying Proterozoic units. Synvolcanic and synsedimentary base metal sulphide deposits are ubiquitous in the Archean rocks. Epigenetic sulphide mineralization consists of remobilized and replacement sulphides and minor sulpharsenides. Epigenetic sulphides occur in permeable rocks and in fault and fracture zones, commonly in juxtaposition with silver veins.The coincidence of silver veins and structures containing remobilized sulphides suggests that sulphide remobilization from Archean basement rocks into Proterozoic vein-bearing structures predated or accompanied vein development. Sulphide remobilization may have also facilitated the mobilization (leaching) of metals from basement sulphides into the vein-forming hydrothermal fluids.
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Prokkola, Hanna, Emma-Tuulia Nurmesniemi, and Ulla Lassi. "Removal of Metals by Sulphide Precipitation Using Na2S and HS−-Solution." ChemEngineering 4, no. 3 (September 4, 2020): 51. http://dx.doi.org/10.3390/chemengineering4030051.

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Precipitation of metals as metal sulphides is a practical way to recover metals from mine water. Sulphide precipitation is useful since many metals are very sparingly soluble as sulphides. Precipitation is also pH dependent. This article investigates the precipitation of metals individually as sulphides and assesses which metals are precipitated as metal hydroxides by adjustment of the pH. The precipitation of different metals as sulphides was studied to determine the conditions under which the HS− solution from the sulphate reduction reaction could be used for precipitation. H2S gas and ionic HS− produced during anaerobic treatment could be recycled from the process to precipitate metals in acidic mine drainage (AMD) prior to anaerobic treatment (Biological sulphate reduction), thereby recovering several metals. Precipitation of metals with HS− was fast and produced fine precipitates. The pH of acid mine water is about 2–4, and it can be adjusted to pH 5.5 before sulphide precipitation, while the precipitation, on the other hand, requires a sulphide solution with pH at 8 and the sulphide in HS− form. This prevents H2S formation and mitigates the risk posed from the evaporation of toxic hydrogen sulphur gas. This is a lower increase than is required for hydroxide precipitation, in which pH is typically raised to approximately nine. After precipitation, metal concentrations ranged from 1 to 30 μg/L.
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Ofori-Sarpong, G., D. K. Adjei, and R. K. Amankwah. "Fungal-Transformation of Surrogate Sulphides and Carbonaceous Matter in Refractory Gold Ores: Revisited." Ghana Mining Journal 17, no. 2 (December 13, 2017): 56–65. http://dx.doi.org/10.4314/gm.v17i2.8.

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In the recovery of gold from refractory gold ores, pretreatment is required to decompose sulphides and liberate occluded gold before cyanidation, and to deactivate carbonaceous matter and prevent it from adsorbing dissolved gold. Until the past three decades, most commercial pretreatment processes had been by abiotic means. Biological pretreatment methods on commercial basis is therefore a recent phenomenon, and several researches are underway to assess the ability of different biological agents in the breakdown of sulphur and carbonaceous matter (CM) in gold ores. This paper, which is a revisit of an earlier one, presents an overview of on-going research aimed at assessing the capability of the fungus, Phanerochaete chrysosporium, to degrade sulphides and CM. Surrogate carbonaceous materials (lignite, bituminous and anthracite coals) and pure sulphides (pyrite and arsenopyrite) were used to model the behavior of CM and sulphides in refractory gold ores. To monitor the extent of biotransformation, preg-robbing test was conducted on the as-received and treated CM, and sulphide sulphur in the residual sulphidic materials was also determined. From an initial preg-robbing effect of 125 µg of gold per gram of CM, the ability of CM to preg-rob gold reduced by 70-95% in the order of lignite<bituminous <anthracite within 21 days of treatment, whereas there were 18% and 39% oxidation of sulphide sulphur in pyrite and arsenopyrite respectively. XRD examination of the treated anthracite confirmed reduction in the graphitic structure of carbon following fungal transformation. Similarly, there was a decline in the major sulphide peak after microbial pretreatment. The results indicate that the fungus biotransforms through destruction of the ordered structure, followed by introduction of oxygen groups. The amorphous nature, thus generated, inhibits the uptake of aurocyanide ions by CM, while enhancing the affinity of cyanide for the oxidised sulphide material in subsequent cyanidation treatment. The findings contribute to knowledge on novel and technically viable alternative methods for oxidative pretreatment of refractory gold ores. Keywords: Phanerochaete Chrysosporium, Carbonaceous Matter, Metal Sulphides, Biotransformation
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Merkle, Roland K. W. "Platinum-group minerals in the middle group of chromitite layers at Marikana, western Bushveld Complex: indications for collection mechanisms and postmagmatic modification." Canadian Journal of Earth Sciences 29, no. 2 (February 1, 1992): 209–21. http://dx.doi.org/10.1139/e92-020.

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The platinum-group minerals in a drill core taken through the middle group of chromitite layers in the Critical Zone at Marikana in the western Bushveld Complex were found to consist mainly of laurite as inclusions in chromite grains. The platinum-group minerals containing Pt, Pd, and Rh are concentrated in the intercumulus silicates and frequently associated with base-metal sulphides. Up to about 20% of all platinum-group minerals in the investigated chromitite layers contain sub stantial amounts of As. The base-metal sulphides are strongly modified in the postmagmatic stage, which led to a significant loss of Fe and S, in this way concentrating Cu, Ni, and the platinum-group elements by factors of up to 10. Interaction between chromite and base-metal sulphides cannot account for all the Fe lost in chromite-poor samples, and the importance of additional processes is indicated. Inclusions in chromite and orthopyroxene indicate the formation of discrete platinum-group minerals and As-rich phases before the formation of an immiscible sulphide melt. Resorption of earlier formed platinum-group minerals into the immiscible sulphide melt and postmagmatic sulphidation destroyed most of the evidence of the early formed platinum-group minerals.
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Pieczonka, Jadwiga. "Polymetallic mineralization in Triassic strata of the NW part of the Kraków-Częstochowa Monocline." Mineralogia 41, no. 1-2 (January 1, 2010): 35–53. http://dx.doi.org/10.2478/v10002-010-0004-1.

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Polymetallic mineralization in Triassic strata of the NW part of the Kraków-Częstochowa MonoclineA new association of ore minerals has been found in the Lower and Middle Triassic rocks in the vicinity of the village of Woźniki in the NW part of the Upper Silesian district. In addition to the typical Zn-Pb-Fe association in dolomites, copper sulphides have been detected in the sandstones and conglomerates of the Lower Bunter. Copper mineralization occurs in the sandstone matrix and is represented by bornite, chalcopyrite, chalcocite, tetrahedrite and covellite. High admixtures of zinc in Cu sulphides and admixtures of copper in Zn-Pb sulphides suggest a common source for the metal-transporting fluids and a single period of sulphide crystallization.
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Eliopoulos, Demetrios G., Maria Economou-Eliopoulos, George Economou, and Vassilis Skounakis. "Mineralogical and Geochemical Constraints on the Origin of Mafic–Ultramafic-Hosted Sulphides: The Pindos Ophiolite Complex." Minerals 10, no. 5 (May 18, 2020): 454. http://dx.doi.org/10.3390/min10050454.

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Sulphide ores hosted in deeper parts of ophiolite complexes may be related to either primary magmatic processes or links to hydrothermal alteration and metal remobilization into hydrothermal systems. The Pindos ophiolite complex was selected for the present study because it hosts both Cyprus-type sulphides (Kondro Hill) and Fe–Cu–Co–Zn sulphides associated with magnetite (Perivoli-Tsoumes) within gabbro, close to its tectonic contact with serpentinized harzburgite, and thus offers the opportunity to delineate constraints controlling their origin. Massive Cyprus-type sulphides characterized by relatively high Zn, Se, Au, Mo, Hg, and Sb content are composed of pyrite, chalcopyrite, bornite, and in lesser amounts covellite, siegenite, sphalerite, selenide-clausthalite, telluride-melonite, and occasionally tennantite–tetrahedrite. Massive Fe–Cu–Co–Zn-type sulphides associated with magnetite occur in a matrix of calcite and an unknown (Fe,Mg) silicate, resembling Mg–hisingerite within a deformed/metamorphosed ophiolite zone. The texture and mineralogical characteristics of this sulphide-magnetite ore suggest formation during a multistage evolution of the ophiolite complex. Sulphides (pyrrhotite, chalcopyrite, bornite, and sphalerite) associated with magnetite, at deeper parts of the Pindos (Tsoumes), exhibit relatively high Cu/(Cu + Ni) and Pt/(Pt + Pd), and low Ni/Co ratios, suggesting either no magmatic origin or a complete transformation of a preexisting magmatic assemblages. Differences recorded in the geochemical characteristics, such as higher Zn, Se, Mo, Au, Ag, Hg, and Sb and lower Ni contents in the Pindos compared to the Othrys sulphides, may reflect inheritance of a primary magmatic signature.
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Harris, D. L., and B. G. Lottermoser. "Phosphate stabilization of polyminerallic mine wastes." Mineralogical Magazine 70, no. 1 (February 2006): 1–13. http://dx.doi.org/10.1180/0026461067010309.

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AbstractPolyminerallic, sulphidic mine wastes were treated with KH2PO4-H2O2 solutions to determine whether the formation of solid phosphate coatings inhibits sulphide oxidation and metal and metalloid mobility. The waste rocks were metal (PbZnCu) and metalloid (AsSb) rich and consisted of major quartz, dickite, illite and sulphide minerals (e.g. galena, chalcopyrite, tetrahedrite, sphalerite, pyrite, arsenopyrite) as well as minor to trace amounts of pre- and post-mining oxidation products (e.g. oxides, hydroxides, arsenates and sulphates). Scanning electron microscopy observations of the waste material treated with KH2PO4-H2O2 solutions showed that metal, metal-alkali and alkali phosphate precipitates formed and coatings developed on all sulphides (with the exception of tetrahedrite). The abundance of phosphate phases was dependant on the availability of metal and alkali cations in solution. In turn, the release of cations was dependent on the amount of sulphide oxidation induced during the experiment or the presence of soluble oxidation products. Lead and to a lesser degree Cu and Zn phosphate coatings remained stable during H2O2 leaching, preventing acid generation and metal release. In contrast, the lack of phosphate coating on tetrahedrite and arsenopyrite allowed oxidation and leaching of As and Sb to proceed and mobilized As and Sb did not form phosphate phases. As a result, As and Sb displayed the greatest release from the coated waste. Thus, the application of KH2PO4-H2O2 solutions to partly oxidized, polyminerallic mine wastes suppresses sulphide oxidation and is most effective in inhibiting Pb (Cu and Zn) release. However, the technique appears ineffective in preventing metalloid (As, Sb) leaching from tetrahedrite- and arsenopyrite-bearing wastes.
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Zhang, YiRan, Nawoong Yoon, and Maria E. Holuszko. "Assessment of Sortability Using a Dual-Energy X-ray Transmission System for Studied Sulphide Ore." Minerals 11, no. 5 (May 4, 2021): 490. http://dx.doi.org/10.3390/min11050490.

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In hard rock mining, sensor-based sorting can be applied as a pre-concentration method before the material enters the mill. X-ray transmission sensors have been explored in mining since 1972. Sorting ore of acceptable grade and waste material before processing at the mill can reduce the amount of tailings per unit of valuable metal in the mining operation and have many economic benefits. Ore samples used in this paper are from a polymetallic carbonate replacement deposit (gold-silver-lead-zinc sulphide) in Southeast Europe. This paper focuses on how the Dual-Energy X-ray Transmission (DE-XRT) data is generated and used for ore characterization and sortability for this sulphide ore. The method used in the DE-XRT analysis in this project is based on the dual-material decomposition method, which is used in the medical industry for radiology. This technique can distinguish sulphides from non-sulphides. However, the correlation developed between the DE-XRT response and the metal content is lacking. As a result, the DE-XRT response can only classify the material effectively but cannot reliably predict the metal content.
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Dissertations / Theses on the topic "Metal sulphides"

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Smit, Timotheus Servaas. "Hydrodesulphurization of thiophenes using transition metal sulphides." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28084.

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Mulligan, David John. "Reduction of sulphur dioxide over transition metal sulphides." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61916.

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Harrison, Mark Robert. "One-dimensional, mixed-metal sulphides – structural and physical properties." Thesis, University of Hull, 2011. http://hydra.hull.ac.uk/resources/hull:5281.

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New one-dimensional sulphides based on Ba2CoS3 have been synthesised and their structural and electronic properties investigated. The starting point was the one-dimensional sulphide Ba2CoS3, which shows one-dimensional anti-ferromagnetism, metallic-like behaviour and a small negative magnetoresistance. Cationic substitutions were carried out on both the barium and cobalt sites of Ba2CoS3. The substitution of zinc for cobalt into Ba2CoS3 resulted in the formation of the series Ba2Cox1−xZnxS3 (x = 0.0-1.0). Ba2Co1−xZnS3 compounds maintain the one-dimensional structure but become paramagnetic and show semiconducting properties. Interestingly significant values of magnetoresistance (up to −25%) are found in the series. The origin of the magnetoresistance is currently unknown although it is suspected that there is some extrinsic contribution. The compound Ba2Co0.75Fe0.25S3 has also been successfully synthesised although attempts to form compounds with higher iron content were not successful. A large number of compounds in the series Ba2Zn1–xMxS3 (M = Fe, Mn, Cr, Ni) have also been synthesised and initial investigations into the properties of these materials show that again they exhibit negative magnetoresistance. Finally Ba1.9K0.1CoS3 has been synthesised although no investigation into the properties has yet been carried out.
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Green, Pamela Rose. "The synthesis and structure of ternary transition metal sulphides." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284056.

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David, Lorraine. "MBE growth and characterisation of metastable transition metal sulphides." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/197.

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Engin, Tahir. "Structural, magnetic and electron transport properties of mixed metal sulphides." Thesis, Heriot-Watt University, 2008. http://hdl.handle.net/10399/2059.

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The construction of cells that enables the electrical resistance of a material to be measured simultaneously with the collection of powder neutron diffraction data at a range of temperatures (4.2 :5 TIK:5 1000) is described. The cells have been used to investigate the origin of the anomalous electron-transport properties of the ternary sulphides, TICu6.ssS4, BaCu4S3 and CuFeS2. Data for TICu6.ssS4 reveal that the anomaly observed at 255 K is associated with a structural change from P41n to 141m on cooling due to a distortion involving a doubling of the e-axis of the unit cell. There,are .~/ two resistance anomalies observed in BaCu4S3. The first at 523 K is associated' with a phase transition from a two-phase mixture (Pllma + Cmem) to a Cmem phase, whilst the second anomaly can be correlated with the decomposition of the 'sample at 923 K. Variable temperature powder neutron diffraction reveals that CuFeS2 adopts a tetragonal antiferromagnetically ordered structure up to 748 K, above which it consists of a mixture of two phases until TN = 823 K, where a loss of magnetic order is coincident with a transformation to a cubic structure. Resistance anomalies are observed at each of those temperatures. A new family of vanadium-substituted chromium sulphides (VxCr2-xS3, 0 < x < 2) has been prepared and characterized by powder X-ray and neutron diffraction, SQUID magnetometry, electrical resistivity, and Seebeck coefficient measurements. Vanadium substitution leads to a single-phase region with a rhombohedral Cr2S3 structure over the composition range 0.0 < x:5 0.75, while at higher vanadium contents (1.6 :5 x < 2.0) a second single-phase region, in which materials adopt a cation-deficient Cr3S4 structure, is observed. Materials with the Cr2S3 structure all exhibit semiconducting behavior whilst those adopting Cr3S4-type structure exhibit metallic behavior. Materials in both single phase regions undergo a magnetic ordering transition at temperatures in the range 90 - 118 K. Materials with the Cr2S3 structure undergo a transition to a ferrimagnetic state, the nature of which has been determined by low-temperature neutron diffraction measurements. Structural studies of the mixed-metal sulphides, FexMnl_xS (0 :5 x :5 0.4) were performed using powder neutron diffraction. Rietveld refinements show that all samples adopt a cubic rock-salt structure (F'm3m) at room temperature. The Feo.2Mno.sS sample is essentially pure phase whilst materials with higher Fe content contain 3CFe7SS (21.3% in Feo.4Mno.6S). Low-temperature neutron diffraction reveals that all materials are magnetically ordered at temperatures in the range 180 - 185 K, below Which they show a structural distortion. The magnetic structure consists of ferromagnetically aligned layers, with antiferromagnetic coupling of adjacent layers. Electron-transport property measurements reveal that all the samples are Arrhenius semiconductors with activation energies that decrease with increasing Fe content.
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d'Arbeloff-Wilson, Sarah. "Reactions of the phosphaalkyne, PCBu't with metal sulphides, selenides and tellurides." Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324201.

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Poole, Mark Charles. "Synthetic and spectroscopic studies of organic sulphides, sulphoxides, sulphones, and their metal complexes." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332281.

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Szkoda, Iwona. "Phase relations, structural studies and physical properties of mixed metal oxides and sulphides." Thesis, Heriot-Watt University, 2008. http://hdl.handle.net/10399/2212.

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The phase relations in three oxide systems; ZnO–BiVO4, Pb2V2O7–BiVO4 and PbO– BiVO4, have been studied and their phase diagrams over the whole component concentration range up to 1273 K have been established. As a result of solid-state reaction between ZnO and BiVO4 mixed at a molar ratio of 2:1 or among ZnO, V2O5 and Bi2O3, mixed at a molar ratio of 4:1:1, a new double vanadate BiZn2VO6 has been obtained. Its crystallographic system was determined, its unit cell parameters were calculated and its incongruent melting temperature was established. A new compound is also formed in the Pb2V2O7–BiVO4 system. It has been shown that BiVO4 and Pb2V2O7 react with each other forming a compound of the formula Pb2BiV3O11, when their molar ratio is equal to 1:1, or between PbO, Bi2O3 and V2O5, mixed at a molar ratio of 4:1:3. This material melts congruently and it crystallises in the triclinic system. A new series of non-stoichiometric sulphides Ga1-xGexV4S8 (0 x 1) has been synthesised by standard solid-state reaction. The samples have been characterised by powder X-ray and neutron diffraction, SQUID magnetometry and electrical transportproperty measurements. Structural analysis reveals that a solid solution is formed throughout this composition range. Magnetic measurements suggest that the ferromagnetic behaviour of the end-member phase GaV4S8 is retained at x 0.7. By contrast Ga0.25Ge0.75V4S8 appears to undergo antiferromagnetic ordering at ca. 15 K. All materials with x ¹ 1 are n-type semiconductors whose resistivity falls by almost six orders of magnitude with decreasing gallium content, whilst the end-member phase GeV4S8 is a ptype semiconductor. Powder neutron diffraction studies show that the cubic unit cell is retained for non-stoichiometric materials to the lowest temperatures studied. Single crystals of five erbium-chromium sulphides have been grown by chemical vapour transport using iodine as the transporting agent. Single-crystal X-ray diffraction reveals that in Er3CrS6, octahedral sites are occupied exclusively by Cr3+ cations, leading to onedimensional CrS4 5- chains of edge-sharing octahedra, whilst in Er2CrS4, Er3+ and Cr2+ cations occupy the available octahedral sites in an ordered manner. By contrast, in Er6Cr2S11, Er4CrS7 and Er8Cr3S15, Er3+ and Cr2+ ions are disordered over the octahedral sites. In Er2CrS4, Er6Cr2S11, Er4CrS7 and Er8Cr3S15, the network of octahedra generates an anionic framework constructed from M2S5 slabs of varying thickness, linked by onedimensional octahedral chains. This suggests that these four phases belong to a series in which the anionic framework may be described by the general formula [M2n+1S4n+3]x-, with charge balancing provided by Er3+ cations located in sites of high-coordination number within one-dimensional channels defined by the framework. Er4CrS7, Er6Cr2S11, Er8Cr3S15 ii and Er2CrS4 may thus be considered as the n = 1, 2, 3 and members of this series. Whilst Er4CrS7 is paramagnetic, successive magnetic transitions associated with ordering of the chromium and erbium sub-lattices are observed on cooling Er3CrS6 (TC(Cr) = 30 K; TC(Er) = 11 K) and Er2CrS4 (TN(Cr) = 42 K, TN(Er) = 10 K) whereas Er6Cr2S11 exhibits ordering of the chromium sub-lattice only (TN = 11.4 K). These four materials have been studied using neutron diffraction which allowed magnetic ordering to be examined.
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Coimbatore, Dhandayuth Venkatesh. "Cerium chloride inhibition for high strength low alloy steel exposed to sulphide polluted seawater." University of Western Australia. School of Mechanical Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0134.

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[Truncated abstract] Corrosion of steel structures caused by sulphide is a common engineering problem encountered by many industries, such as the petroleum, chemical processing, mining and mineral processing industries. The control of sulphide corrosion is still a controversial topic among corrosion engineers. There is an absence of guideline for a reliable acceptable limit of sulphide level in service and each processing industry has its own empirical values. Selection of inhibitors in the sulphide environment depends on laboratory testing before its actual application in pipelines and reaction vessels. Many investigators have postulated the corrosion mechanisms due to sulphide based on operating envelopes such as pH, chloride, manganese, hydrogen sulphide, sulphate reducing bacteria levels and inhibitor concentration. It is recommended in the literature that the batch dosing of inhibitor and biocide needs to be evaluated in regards to sulphide reducing bacteria (SRB) level, which may produce sulphide concentrations up to 2000 ppm. Although sulphide scale formation may protect the base metal by providing a physical barrier, the detrimental effects of sulphide are often inevitable, such as stress corrosion cracking, hydrogen embrittlement, etc. Currently, there are many chemicals that are used as inhibitors to prevent corrosion by scavenging the sulphide from the environment. Cerium, a rare-earth element, is not used as inhibitor in the sulphide environment. Also, there are no previous research findings on the effects of compounds of rare-earth metals, such as cerium chloride (CeCl3), in sulphide environment. This research examines the corrosion behaviour of 0.4Mo-0.8Cr steel, a High Strength Low Alloy (HSLA) steel, in sulphide-polluted artificial seawater with the addition of CeCl3 and glutaraldehyde. ... It is postulated that the moderate inhibiting effect of CeCl3 is due to the scavenging effect thereby forming Ce2S3 complex. Further reaction of sulphide with steel resulted in ferrous sulphide, leading to an increased corrosion rate. It is also concluded that the CeCl3 interferes with both anodic and cathodic reactions in deaerated conditions. Addition of glutaraldehyde in the sulphide-polluted seawater was found to decrease the corrosion rate. According to the electrochemical measurements conducted, the concurrent addition of glutaraldehyde and CeCl3 appeared to have an added effect on reducing the corrosion of the steel, as evidenced by the increase of the open circuit potential during the short-term testing. From the weight loss measurements after 60 days, sulphide pollution in deaerated seawater was found to increase corrosion rate. This is attributed to the increase of sulphide activity whereby continual dissolution of steel was encountered. From the weight loss tests, it was found that the addition of CeCl3 and glutaraldehyde reduced the corrosion rate of the steel in the solutions containing 0-10 ppm sulphide. There is no noticeable corrosion rate decrease for the solution containing 100 ppm sulphide. The added effect of CeCl3 and glutaraldehyde to the SRB medium has resulted in lower corrosion rates. Further detailed experimentation is required to elucidate the corrosion reduction mechanism in glutaraldehyde-containing environments.
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Books on the topic "Metal sulphides"

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Weber, Thomas, Roel Prins, and Rutger A. Santen, eds. Transition Metal Sulphides. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3.

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Rajendran, Saravanan, Mu Naushad, D. Durgalakshmi, and Eric Lichtfouse, eds. Metal, Metal Oxides and Metal Sulphides for Biomedical Applications. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-56413-1.

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Thomas, Weber, Prins Roelof, Santen R. A. van, and NATO Advanced Research Workshop on Challenges for Sulphides in Material Sciences and Catalysis (1997 : Varna, Bulgaria), eds. Transition metal sulphides: Chemistry and catalysis. Dordrecht: Kluwer Academic Publishers, 1998.

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International, Symposium on Electrochemistry in Mineral and Metal Processing (7th 2006 Denver Colorado). Electrochemistry in mineral and metal processing VII: Proceedings of the International Symposium. Pennington, New Jersey: Electrochemical Society, 2006.

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Brooks, Bernie W. Preparation of a manual of methods used in revegetation of reactive sulphide tailings basins: Final report. Ottawa, Ont: Canada Centre for Mineral and Energy Technology = Centre canadien de la technologie des minéraux et de l'énergie, 1989.

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Toulhoat, Hervé, and Pascal Raybaud. Catalysis by transition metal sulphides: From molecular theory to industrial application. Paris, France: Technip, 2013.

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Palmer, Helen Mary. Synthesis and characterisation of some mixed metal sulphides and oxide sulphates. Birmingham: University of Birmingham, 1998.

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International Symposium on Electrochemistry in Mineral and Metal Processing (6th 2003 Paris, France). Electrochemistry in mineral and metal processing VI: Proceedings of the International Symposium. Edited by Doyle Fiona M, Kelsall G. H, Woods R, Electrochemical Society. Industrial Electrolysis and Electrochemical Engineering Division., and Electrochemical Society. Energy Technology Division. Pennington, New Jersey: Electrochemical Society, 2003.

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International Symposium on Electrochemistry in Mineral and Metal Processing (4th 1996 Los Angeles, Ca.). Proceedings of the Fourth International Symposium on Electrochemistry in Mineral and Metal Processing. Edited by Woods R, Richardson Paul E, Doyle Fiona M, and Electrochemical Society. Industrial Electrolysis and Electrochemical Engineering Division. Pennington, NJ: Electrochemical Society, 1996.

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International Symposium on Electrochemistry in Mineral and Metal Processing (2nd 1988 Atlanta, Ga.). Proceedings of the International Symposium on Electrochemistry in Mineral and Metal Processing II. Pennington, NJ (10 S. Main St., Pennington 08534-2896): Electrochemical Society, 1988.

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Book chapters on the topic "Metal sulphides"

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Genin, H. S., and J. A. Ibers. "Solid State Transition Metal Sulphides." In Transition Metal Sulphides, 1–35. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_1.

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Kogan, V. M. "Reaction Dynamics during C-S Bond Breaking in Sulphur-Containing Molecules: Isotope Studies." In Transition Metal Sulphides, 235–71. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_10.

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Zdražil, M. "Effects of Catalyst Composition and Pretreatment on the Product Distribution in Hydrodesulphurization, Hydrodenitrogenation and Hydrodechlorination." In Transition Metal Sulphides, 273–309. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_11.

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Gosselink, J. W. "Metal Sulphides and Refinery Processes." In Transition Metal Sulphides, 311–55. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_12.

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Kaim, W., F. M. Hornung, R. Schäfer, J. Fiedler, M. Krejcik, and S. Zališ. "Charge Transfer Phenomena in Transition Metal Sulphur Chemistry." In Transition Metal Sulphides, 37–55. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_2.

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Morris, R. H. "The Chemistry of the Dihydrogen Ligand in Transition Metal Compounds with Sulphur-Donor Ligands." In Transition Metal Sulphides, 57–87. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_3.

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Angelici, R. J. "Binding and Reactivity of Thiophene-Type Ligands in Transition Metal Complexes and Clusters." In Transition Metal Sulphides, 89–127. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_4.

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Bianchini, C., and A. Meli. "Hydrogenation, Hydrogenolysis and Desulphurization of Thiophenes by Soluble Metal Complexes." In Transition Metal Sulphides, 129–54. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_5.

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Byskov, L. S., J. K. Nørskov, B. S. Clausen, and H. Topsøe. "Sulphur Bonding in Transition Metal Sulphides and MoS2 Based Structures." In Transition Metal Sulphides, 155–68. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_6.

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Hensen, E. J. M., V. H. J. Beer, and R. A. Santen. "Chemistry and Reactivity of Transition Metal Sulphides in Relation to Their Catalytic Performance." In Transition Metal Sulphides, 169–88. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-3577-3_7.

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Conference papers on the topic "Metal sulphides"

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Macías, Gabriela, Carlos Lorenzana, and Javier Fernandez. "Determination of the Influence of Metal Sulphides on the Tribofilm and the Friction Behavior." In EuroBrake 2021. FISITA, 2021. http://dx.doi.org/10.46720/3291380eb2021-fbr-003.

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Metal sulphides are additives that are used in brake pad formulations because they help to stabilize the coefficient of friction, reduce wear and improve NVH. Previous rimsa studies have shown that the oxidation mechanism of metal sulphides is one of the key properties that explain their contribution to performance and wear. Depending on the metal sulphide, the oxidation mechanism is different and so is the tribochemistry. Hence, the transfer layer formed will strongly depend on the metal sulphide used. This work is focused on establishing a connection among the metal sulphide oxidation, the transfer layer formed and the performance. The friction behavior was determined through two tests, J2522 and J2707, using a NAO formula where only the metal sulphide was varied. While the transfer layer characterization was carried out through pad SEM-EDS cross-section analysis, after each test. The differences in thermal profile of J2522 and J2707 illustrate the correlation between performance and wear and different oxidation mechanisms depending on the metal sulphide used. SEM characterization of pad surface also shows that the transfer layer morphology varies depending on the metal sulphide used in the formulation. Hence, the results of this research indicate that the morphology of the transfer layer and the friction behaviour strongly depend on the oxidation mechanism of the metal sulphide.
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Kumar, Upendra, Satadeep Bhattacharjee, and Seung-Cheol Lee. "Highly efficient degradation of phenol via metal sulphides." In NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0064362.

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GAPONIK, N., D. SHCHUKIN, A. KULAK, and D. SVIRIDOV. "SYNTHESIS OF Q-SIZED METAL SULPHIDES IN THE ELECTROPOLYMER MATRIX." In Reviews and Short Notes to Nanomeeting '97. WORLD SCIENTIFIC, 1997. http://dx.doi.org/10.1142/9789814503938_0042.

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Zhou, Ying, Meng Dan, and Arvind Prakash. "Noble metal-free Metal Sulphides as Highly Efficient Visible Light Driven Photocatalysts for H2 Production from H2S." In Nano-Micro Conference 2017. London: Nature Research Society, 2017. http://dx.doi.org/10.11605/cp.nmc2017.01052.

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Brodbeck, Maurice, and Sean McClenaghan. "Complex Metal(loid) Deportment in Porphyry Ore Sulphides - Insights from LA-ICP-MS Mapping." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12137.

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Maraeva, Evgeniya, Nikita Permiakov, and Stanislav Tulenin. "The Research on the Thermostability of Metal Sulphides Nanomaterials Obtained via Chemical Bath Deposition Method." In 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech). IEEE, 2018. http://dx.doi.org/10.1109/eexpolytech.2018.8564370.

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Macías, Gabriela, Carlos Lorenzana, and Javier Fernandez. "A Study of the Interactions between Phenolic Resin and Metal Sulphides and Their Contribution to PAD Performance and Wear." In Brake Colloquium & Exhibition - 38th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2020. http://dx.doi.org/10.4271/2020-01-1600.

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Forero Ballesteros, Adriana, Jose´ A. da Cunha Ponciano, and Ivani de S. Bott. "Study of the Susceptibility of API 5L X80 Girth Welds to Sulfide Stress Corrosion Cracking and Hydrogen Embrittlement." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31243.

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The growing demand for natural gas and oil, as energy sources, has driven industry’s need for ever-increasing strength levels in oil and gas transmission pipeline materials in order to achieve safe and economic transportation. The current world trend points to the use of pipes with larger diameters and thinner wall thicknesses, operating under high pressure. In addition, pipeline steels for sour service must exhibit good Hydrogen Induced Cracking (HIC) and Sulphide Stress Corrosion Cracking (SSCC) resistance. This study evaluates the susceptibility of API 5L-X80 girth welds to SSCC and Hydrogen Embrittlement (HE). Slow strain rate tensile (SSRT) tests and Hydrogen Permeation tests were performed at room temperature, in different acidic environment containing sodium thiosulfate solutions. Most of the SSRT tests undertaken in solution, showed a loss of ductility and a decrease in the reduction of area, as compared with tests conducted in air. The susceptibility to HE and potentially SSCC was evidenced by a reduction in ductility in the SSRT tests and an increase in the hydrogen permeation current values, for almost all welded joints. This was observed with greater intensity for the more acidic test solutions (pH = 3.4), while for the less acidic test solutions (pH = 4.4) little loss of ductility was observed and the hydrogen permeation current remained at values close to zero, indicating little or no permeation of hydrogen through the metal for the testing times applied. The behaviour exhibited by the samples tested in the more acidic solutions was attributed to the dissolution of material from the sample together with hydrogen embrittlement. These results confirmed that the use of sodium thiosulfate solutions to generate H2S, permits the study of phenomena related to SCC in environments containing sulphides.
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Lazarov, Marina, Aleksandar Pačevski, and Janez Zavašnik. "Occurrences and processes of precious metal enrichment in sulphides assessed by combining LA-ICP-MS, HR-TEM and Fe isotope LA-MC-ICP-MS analyses." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7689.

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AMDUR, Alexei, and Sergei FEDOROV. "INFLUENCE OF CaF2 AND CaCO3 FLUX ADDITIVES ON THE DISTRIBUTION OF GOLD AND PLATINUM BETWEEN MATTE AND SLAG DURING MELTING OF COPPER-NICKEL SULPHIDE MATERIALS." In METAL 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/metal.2021.4266.

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Reports on the topic "Metal sulphides"

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Neyedley, K., J. J. Hanley, P. Mercier-Langevin, and M. Fayek. Ore mineralogy, pyrite chemistry, and S isotope systematics of magmatic-hydrothermal Au mineralization associated with the Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328985.

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The Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec. The MIC is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate genetic links between deposits and the MIC, mineralized samples from two of the epizonal 'intrusion-related' Au-Cu vein systems (Doyon and Grand Duc Au-Cu) have been characterized using a variety of analytical techniques. Preliminary results indicate gold (as electrum) from both deposits occurs relatively late in the systems as it is primarily observed along fractures in pyrite and gangue minerals. At Grand Duc gold appears to have formed syn- to post-crystallization relative to base metal sulphides (e.g. chalcopyrite, sphalerite, pyrrhotite), whereas base metal sulphides at Doyon are relatively rare. The accessory ore mineral assemblage at Doyon is relatively simple compared to Grand Duc, consisting of petzite (Ag3AuTe2), calaverite (AuTe2), and hessite (Ag2Te), while accessory ore minerals at Grand Duc are comprised of tellurobismuthite (Bi2Te3), volynskite (AgBiTe2), native Te, tsumoite (BiTe) or tetradymite (Bi2Te2S), altaite (PbTe), petzite, calaverite, and hessite. Pyrite trace element distribution maps from representative pyrite grains from Doyon and Grand Duc were collected and confirm petrographic observations that Au occurs relatively late. Pyrite from Doyon appears to have been initially trace-element poor, then became enriched in As, followed by the ore metal stage consisting of Au-Ag-Te-Bi-Pb-Cu enrichment and lastly a Co-Ni-Se(?) stage enrichment. Grand Duc pyrite is more complex with initial enrichments in Co-Se-As (Stage 1) followed by an increase in As-Co(?) concentrations (Stage 2). The ore metal stage (Stage 3) is indicated by another increase in As coupled with Au-Ag-Bi-Te-Sb-Pb-Ni-Cu-Zn-Sn-Cd-In enrichment. The final stage of pyrite growth (Stage 4) is represented by the same element assemblage as Stage 3 but at lower concentrations. Preliminary sulphur isotope data from Grand Duc indicates pyrite, pyrrhotite, and chalcopyrite all have similar delta-34S values (~1.5 � 1 permille) with no core-to-rim variations. Pyrite from Doyon has slightly higher delta-34S values (~2.5 � 1 permille) compared to Grand Duc but similarly does not show much core-to-rim variation. At Grand Duc, the occurrence of Au concentrating along the rim of pyrite grains and associated with an enrichment in As and other metals (Sb-Ag-Bi-Te) shares similarities with porphyry and epithermal deposits, and the overall metal association of Au with Te and Bi is a hallmark of other intrusion-related gold systems. The occurrence of the ore metal-rich rims on pyrite from Grand Duc could be related to fluid boiling which results in the destabilization of gold-bearing aqueous complexes. Pyrite from Doyon does not show this inferred boiling texture but shares characteristics of dissolution-reprecipitation processes, where metals in the pyrite lattice are dissolved and then reconcentrated into discrete mineral phases that commonly precipitate in voids and fractures created during pyrite dissolution.
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Fyon, A. Volcanic - Associated Massive Base Metal Sulphide Mineralization. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132297.

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Franklin, J. M. Volcanic-associated massive sulphide base metals. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/207974.

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Bailes, A. H., and A. G. Galley. Setting of Paleoproterozoic volcanic-hosted massive base metal sulphide deposits, Snow Lake. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207583.

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Mackenzie, L. M., and D. H. C. Wilton. Uranium, Molybdenum and Base Metal Sulphide Mineralization: Three Different Styles of Ore Formation in the Burnt Lake area, Central Labrador. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122472.

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Mercier-Langevin, P., M. D. Hannington, B. Dubé, S. J. Piercey, J M Peter, and S. J. Pehrsson. Precious metal enrichment processes in volcanogenic massive sulphide deposits - a summary of key features, with an emphasis on TGI-4 research contributions. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296548.

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Exhalative base metal sulphides. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/213722.

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