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Journal articles on the topic 'Sulphides'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Knobloch, Marjan, and Bernd G. Lottermoser. "Infrared Thermography: A Method to Visualise and Analyse Sulphide Oxidation." Minerals 10, no. 11 (2020): 933. http://dx.doi.org/10.3390/min10110933.

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Environmental testing of sulphidic ores and wastes aims to assess the release of metals and metalloids at acid pH conditions and the samples’ likelihood to produce acid rock drainage (ARD). However, the majority of established ARD tests measure geochemical properties of samples and cannot visualise the exothermic oxidation reactions and their intensity leading to metalliferous drainage in all pH environments. This paper proposes a new protocol to detect and visualise the sulphide oxidation in ores and wastes. Six nearly monomineralic sulphides were crushed, sieved to two size fraction (0.09–4

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2

Barnes, Sarah-Jane, and A. J. Naldrett. "Variations in platinum group element concentrations in the Alexo mine komatiite, Abitibi greenstone belt, northern Ontario." Geological Magazine 123, no. 5 (1986): 515–24. http://dx.doi.org/10.1017/s001675680003510x.

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AbstractThe noble element (Os, Ir, Ru, Rh, Pt, Pd, Au) patterns from sulphides associated with the komatiites at the Alexo mine show variable degrees of fractionation. Massive sulphides at the contact between underlying intermediate volcanics and overlying komatiites have the least fractionated patterns (Pd/Ir = 44). Net-textured sulphides which immediately overlie the massive sulphides have extremely fractionated noble element patterns (Pd/Ir = 171). The disseminated sulphides in the overlying komatiite exhibit an intermediate degree of fractionation (Pd/Ir = 110). The variations in noble ele

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3

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 (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 sulphide

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4

Smith, W. D., W. D. Maier, and I. Bliss. "Contact-style magmatic sulphide mineralisation in the Labrador Trough, northern Quebec, Canada: implications for regional prospectivity." Canadian Journal of Earth Sciences 57, no. 7 (2020): 867–83. http://dx.doi.org/10.1139/cjes-2019-0137.

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The Labrador Trough in northern Quebec is currently the focus of ongoing exploration for magmatic Ni-Cu-platinum group element (PGE) sulphide ores. This geological belt hosts voluminous basaltic sills and lavas of the Montagnais Sill Complex, which are locally emplaced among sulphidic metasedimentary country rocks. The recently discovered Idefix PGE-Cu prospect represents a stack of gabbroic sills that host stratiform patchy disseminated to net-textured sulphides (0.2–0.4 g/t PGE+Au) over a thickness of ∼20 m, for up to 7 km. In addition, globular sulphides occur at the base of the sill, adjac

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5

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 (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 revis

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6

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 (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

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7

Lutnicki, Krzysztof, Eligiusz Madej, Tomasz Riha, and Łukasz Kurek. "Polioencephalomalacia in ruminants caused by excessive amount of sulphur - a review." Bulletin of the Veterinary Institute in Pulawy 58, no. 2 (2014): 321–26. http://dx.doi.org/10.2478/bvip-2014-0050.

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Abstract Polioencephalomalacia as a result of sulphur excess is a growing problem in cattle and sheep, mainly in young, growing animals. It is common in different regions of the world. The disease develops favoured by certain conditions such as sustained provision of feed and water with high sulphur content, use of dietary supplements containing sulphur, and a habitat with high hydrogen sulphide concentration. Pathogenesis of the disease is complex, but very important are oxidative-antioxidative imbalance, dysfunction of vessels, and secondary cerebral cortex ischaemia as a result of direct an

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8

Edwards, Grant A., Phillip A. Culp, and Justin M. Chalker. "Allyl sulphides in olefin metathesis: catalyst considerations and traceless promotion of ring-closing metathesis." Chemical Communications 51, no. 3 (2015): 515–18. http://dx.doi.org/10.1039/c4cc07932a.

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Allyl sulphides provoke rapid olefin metathesis when matched with an appropriate catalyst. In relay metathesis, allyl sulphides can serve as traceless promoters that facilitate the synthesis of non-sulphide targets.

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9

DEMARIGNY, YANN, CÉLINE BERGER, NATHALIE DESMASURES, MICHELINE GUEGUEN, and HENRY E. SPINNLER. "Flavour sulphides are produced from methionine by two different pathways by Geotrichum candidum." Journal of Dairy Research 67, no. 3 (2000): 371–80. http://dx.doi.org/10.1017/s0022029900004209.

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We have investigated the capacities of Geotrichum candidum strains to produce sulphides from methionine. This attribute is very important in cheese technology because of the flavouring potential of sulphur compounds. A spectrophotometric procedure using 5,5′-dithiobis(2-nitrobenzoic acid) to determine sulphides was tested on a collection of G. candidum strains, and confirmed by gas chromatography–mass spectrometry. The strains were distinguished on the basis of their ability to produce methanethiol. Gas chromatography–mass spectrometry also made it possible to identify other sulphides, such as

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10

Luptakova, Alena, and E. Macingova. "Sorption of Copper Ions by Biogenic Iron Sulphides." Advanced Materials Research 20-21 (July 2007): 631–34. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.631.

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Biogenic iron sulphides are excellent adsorbents for various heavy metals ions. Consequently, they have practical application for the elimination of heavy metals from waste waters. One of the principles for the iron sulphides preparation is the application of sulphatereducing bacteria. This biological-chemical method is based on the ability of these bacteria to reduce sulphates to hydrogen sulphide, which binds with the ferrous cations to form insoluble precipitates – iron sulphides. Under certain bacterial growth conditions biogenic iron sulphides can be magnetic. The aim of this work is to s

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11

Nowińska, Katarzyna, and Zdzisław Adamczyk. "Chemical composition of iron sulphides contained in dust from pyrometallurgical Zn and Pb production." Geochemistry: Exploration, Environment, Analysis 21, no. 2 (2021): geochem2020–073. http://dx.doi.org/10.1144/geochem2020-073.

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The paper presents results of investigations of the chemical composition of iron sulphides contained in dust from the pyrometallurgical production process of zinc and lead. The main mineral components of these dusts are sphalerite, galena, iron sulphide – pyrite, zincite, anglesite and probably kirchsteinite. The tests performed have demonstrated that the chemical composition of iron sulphide grains was not close to stoichiometric, the grains were non-uniform in terms of phase composition and they always included admixtures in the form of inclusions of other sulphides, i.e. zinc sulphide and l

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12

Eman, M. Ismael, M. Abdellah Islam, E. M. Bakheet Momtaz, and R. Eletmany Mohamed. "Mini Review on Nano Materials Synthesis and Applications in Metal Sulphides." Mini Review on Nano Materials Synthesis and Applications in Metal Sulphides 8, no. 12 (2023): 13. https://doi.org/10.5281/zenodo.10301800.

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Nanotechnology has attracted considerable interest due to its ability to manipulate matter at the atomic and molecular levels.This comprehensive review focuses on nanomaterials, specifically emphasizing metal sulphides, elucidating their distinctive properties and applications. Nanoparticles, integral components of nanostructures, manifest unique physical and chemical traits divergent from bulk materials, rendering them appealing for diverse industrial uses. The review provides a detailed categorization of nanomaterials based on dimensions, encompassing 1D (surface films), 2D (monolayer materi

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13

Prokkola, Hanna, Emma-Tuulia Nurmesniemi, and Ulla Lassi. "Removal of Metals by Sulphide Precipitation Using Na2S and HS−-Solution." ChemEngineering 4, no. 3 (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

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14

Zhang, Hongyu, and Yunqian Cui. "Study of Sulphides Production Affecting the Fermentation Process of the Lager Beer." International Journal of Biology and Life Sciences 3, no. 1 (2023): 4–8. http://dx.doi.org/10.54097/ijbls.v3i1.9481.

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In the lager brewing production process, volatile sulphides such as sulphur dioxide, hydrogen sulphide, thiols and thioesters are produced by yeast metabolism during the fermentation of lager beer. Fluctuations in malt raw materials, yeast strain characteristics and fermentation process parameter adjustments can all have an impact on sulphides, and the concentration of sulphides in finished beer can have a negative impact on the sensory tasting of lager beer. This study investigated the fermentation of sulphides in lager beer under the conditions of dissolved wort oxygen, yeast recovery, ferme

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15

V., G. KULKARNI, and V. JADHAV G. "INTERACTION OF HYDROXYACETOPHENONES AND THEIR DERIVATIVES AND THIONYL CHLORIDE IN PRESENCE OF FINELY DIVIDED COPPER. PART IX. PREPARATION OF 3: 3'-DIACETYL-4: 4'-DIHYDROXY-6: 6'-DIMETHYL- DIPHENYL SULPHIDE AND 3: 3'-DIACETYL-4 :4'-DIMETHLY-6 : 6'-DIHYDROXY- DIPHENYL SULPHIDE AND THEIR DERIVATIVES." Journal of Indian Chemical Society Vol. 33, July 1956 (2022): 519–22. https://doi.org/10.5281/zenodo.6576175.

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Preparation of 3: 3<em>'</em>-diacetyl-4 : 4<em>'</em>-dihydroxy-6: 6<em>'</em>-dimethyldiphenyl sulphide (I) and 3 :3<em>'</em>-diacetyl 4 :4<em>'</em>-dimethyl-6 :6<em>'</em>-dihydroxydiphenyl sulphide (II) is described. Bromination furnishes the corresponding dibromo sulphides which on nitration yield 2-bromo-3-methyl-4:6-dinitrophenol. Nitration of both the sulphides affords 2 : 4 : 6-trinitro-3-methylphenol as the final product, but in the case of the sulphide (II) dinitrosulphide and 2-methyl-3: 5<em>-</em>dinitro-4-hydroxy-acetophenone have also been is

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16

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 (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

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17

Santagulda, F., and M. D. Hannington. "Characteristics of gold mineralization in volcanogenic massive sulphide deposits of the Notre Dame Bay area, central Newfoundland." Canadian Journal of Earth Sciences 33, no. 2 (1996): 316–34. http://dx.doi.org/10.1139/e96-024.

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A reconnaissance study of 19 volcanogenic massive sulphide deposits in the Notre Dame Bay area indicates Au concentrations of up to 30 ppm (Betts Cove), and elevated gold contents (>1 ppm Au) have been found in samples from 10 additional past producers and developed prospects. Systematic trends in the occurrence of gold are observed in two principal sulphide assemblages: polymetallic, pyrite–sphalerite–chalcopyrite–galena ± arsenopyrite assemblages (type I) and pyrite–chalcopyrite ± sphalerite ± pyrrhotite assemblages (type II). Type I assemblages occur in deposits with dominantly felsic ho

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18

Vikentyev, Ilya, Olga Vikent’eva, Eugenia Tyukova, et al. "Noble Metal Speciations in Hydrothermal Sulphides." Minerals 11, no. 5 (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

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19

Belogub, E. V., C. A. Novoselov, B. Spiro, and B. A. Yakovleva. "Mineralogical and S isotopic features of the supergene profile of the Zapadno-Ozernoe massive sulphide and Au-bearing gossan deposit, South Urals." Mineralogical Magazine 67, no. 2 (2003): 339–54. http://dx.doi.org/10.1180/0026461036720105.

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The profile of the supergene zone of the Zapadno-Ozernoe massive sulphide Cu-Zn deposit differs from the classic model (Emmons, 1917) in that it includes a prominent dark sooty subzone rich in secondary sulphides. This subzone is situated above residual pyrite sands, which overlie the massive sulphide body and below quartz-baryte leached sands. It contains a diverse mineral assemblage which consists of secondary sulphides such as galena, sphalerite, metacinnabar, Se-bearing pyrite—dhzarkenite series, tiemannite, native Au, native S and native Se, and unidentified sulphosalts of Ag and Hg. The

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20

Pieczonka, Jadwiga. "Polymetallic mineralization in Triassic strata of the NW part of the Kraków-Częstochowa Monocline." Mineralogia 41, no. 1-2 (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 sul

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21

Kotwica, Łukasz, Ewa Kapeluszna, Piotr Stępień, Jan Deja, Mirja Illikainen, and Łukasz Gołek. "Influence of Sulphides on Hydration of Ground Granulated Slag Alkali Activated Mortars and Pastes." Key Engineering Materials 761 (January 2018): 92–95. http://dx.doi.org/10.4028/www.scientific.net/kem.761.92.

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Influence of sodium sulphide on properties of sodium hydroxide activated ground granulated blast furnace slag was investigated. Properties of both fresh (cone flow, density) as well as hardened (compressive strength) mortars were determined. Early hydration of pastes was investigated using conducting calorimetry. Results showed, that introduction of sodium sulphide to caustic soda activated slag only slightly influence the course of hydration process. Early strength is increased by about 10%. In later periods strength is virtually not affected by the presence of sodium sulphide. Those observat

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22

McDonald, Mervin, Stephen Piercey, Graham Layne, Lee Pigage, and Glenn Piercey. "Mineral Assemblages, Textures and In Situ Sulphur Isotope Geochemistry of Sulphide Mineralization from the Cyprus-Type Ice Volcanogenic Massive Sulphide (VMS) Deposit, Yukon, Canada." Minerals 8, no. 11 (2018): 501. http://dx.doi.org/10.3390/min8110501.

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The Permian (~273–274 Ma) Ice volcanogenic massive sulphide (VMS) deposit represents a mound shaped Cyprus (mafic)-type VMS deposit (~4.5 Mt @ 1.5% Cu) hosted in basaltic rocks of Slide Mountain terrane. The deposit consists of massive sulphides that are underlain by a chlorite-sulphide-hematite-rich stringer pipe, and overlain by a hematite-(pyrite)-rich exhalative chert. The sulphides are divided into five facies: (1) pyrite-rich; (2) pyrite-bornite-rich; (3) pyrite-chalcopyrite-rich; (4) hematite-pyrite; and (5) stringer sulphide. The sulphides have a distinct paragenetic and textural evolu

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23

Oszczepalski, Sławomir, and Andrzej Chmielewski. "Mineralization of the Zechstein Lower Anhydrite in the Fore-Sudetic Monocline." Biuletyn Państwowego Instytutu Geologicznego 472, no. 472 (2018): 135–54. http://dx.doi.org/10.5604/01.3001.0012.7116.

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The paper presents the characteristics of ore mineralization of the Lower Anhydrite in the Fore-Sudetic Monocline. Both reduced and oxidized (Rote Fäule) rocks have been investigated. Reduced anhydrites are characterized by significant variability of metal concentrations and sulphide minerals. The most intensely mineralized anhydrites occur above the oxidized bottom part of the Lower Anhydrite. Mineralization in this part is dominated by copper sulphides (chalcocite, digenite, covellite, bornite and chalcopyrite) which are accompanied by galena and sphalerite. Further away from the oxidized zo

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24

Gajic, Natasa, Zeljko Kamberovic, Zoran Andjic, Marija Korac, Jarmila Trpcevská, and Mirko Stamatovic. "Improving the synthesis process of tribological materials based on tin sulphides by adding graphite as additive." Journal of the Serbian Chemical Society 84, no. 4 (2019): 423–33. http://dx.doi.org/10.2298/jsc180628102g.

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The aim of this research was to study the effect of graphite addition in the process of synthesis of tribological materials based on tin sulphides. The tin sulphides powders were synthesized from selected precursors by pyrometallurgical method in rotary tilting tube furnace. The thermodynamic parameters of the synthesis were determined using HSC Chemistry software modelling package. In addition, the synthesis process was also characterized by the thermal analysis method: simultaneous differential scanning calorimetry and thermogravimetry (DCS-TGA). The characterization of the synthesized tin s

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25

Hampton, W. A., G. P. White, P. W. O. Hoskin, P. R. L. Browne, and K. A. Rodgers. "Cinnabar, livingstonite, stibnite and pyrite in Pliocene silica sinter from Northland, New Zealand." Mineralogical Magazine 68, no. 1 (2004): 191–98. http://dx.doi.org/10.1180/0026461046810180.

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AbstractSilica sinter masses in the southern portion of the Pliocene Puhipuhi geothermal field of Northland, New Zealand, have recrystallized to microcrystalline quartz and moganite but many primary depositional fabrics of the sinters can still be recognized. Finely disseminated cinnabar, acicular stibnite, pyrite framboids and minor livingstonite are distributed through both massive sinter and stromatolitic fabrics with sulphide mineralization extending from fractured rocks about former spring vents into less disturbed sinter layers. The deposition of sulphides in the sinters is part of a con

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26

Jasiński, A. W. "Conditions of formation of the iron-containing minerals, Hällefors silver mines, Bergslagen, Sweden." Mineralogical Magazine 50, no. 355 (1986): 101–10. http://dx.doi.org/10.1180/minmag.1986.050.355.13.

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AbstractThe Hällefors silver deposit is regarded as a volcanogenic-exhalative iron ore deposit with dispersed amounts of Ag-Pb-Zn (±Cu) which has undergone secondary remobilization leading to the concentration of sulphides and sulphosalts. Based on data from the iron oxides and sulphides, the sulphide-sulphosalt mineralization is believed to have been formed in two stages. The first is characterized by the ranges 573-473 K and 2.25–1.5 kbar, higher gradient of changes of log aS2 with temperature and mostly sulphide precipitation; the second by the ranges 473–443 K, lower gradient of changes of

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27

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 (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 s

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CAPEILLÈRE-BLANDIN, Chantal, Christelle MARTIN, Nicoletta GAGGERO, Piero PASTA, Giacomo CARREA, and Stefano COLONNA. "Sulphoxidation reaction catalysed by myeloperoxidase from human leucocytes." Biochemical Journal 335, no. 1 (1998): 27–33. http://dx.doi.org/10.1042/bj3350027.

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The oxidation of alkyl aryl sulphides by myeloperoxidase (MPO) at the expense of hydrogen peroxide was investigated under steady-state conditions. The sulphide concentration effect was studied under saturating H2O2 concentrations at pH 5.0 and 20 °C. The kinetic constants, kcat and Km, of the different substrates were determined and the values were in the 1–10 s-1 range and around 43±26 µM respectively, whatever the sulphide considered. In the case of p-substituted thioanisoles, the oxidation rate was dependent upon the substituent effect. The correlation of log(kcat) with the substituent cons

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29

Parnell, John, Sean McMahon, and Adrian Boyce. "Demonstrating deep biosphere activity in the geological record of lake sediments, on Earth and Mars." International Journal of Astrobiology 17, no. 4 (2017): 380–85. http://dx.doi.org/10.1017/s1473550417000337.

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AbstractThe investigation of Gale Crater has highlighted the occurrence of lake sediments in the geological record of Mars. Lacustrine basins include a diversity of potential habitats for life. An analogue terrestrial lacustrine basin of Devonian age in Scotland contains sulphide minerals in several settings where subsurface microbial colonization can be envisaged. Sulphur isotope compositions for the sulphides imply that they were precipitated by microbial sulphate reduction. The data suggest that the search for life in martian lacustrine basins should include investigation of potential subsu

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30

Goodfellow, Wayne D., and Jan M. Peter. "Sulphur isotope composition of the Brunswick No. 12 massive sulphide deposit, Bathurst Mining Camp, New Brunswick: implications for ambient environment, sulphur source, and ore genesis." Canadian Journal of Earth Sciences 33, no. 2 (1996): 231–51. http://dx.doi.org/10.1139/e96-020.

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The Brunswick No. 12 massive sulphide deposit occurs within a Middle Ordovician bimodal volcanic and sedimentary sequence that is thought to have formed in a continental back-arc rift covered with a thick succession of carbonaceous hemipelagic and turbiditic sedimentary rocks. The deposit consists of three en echelon lenses that are zoned from Vent Complex to Bedded Ore and Bedded pyrite facies. The Bedded Ore facies has the lowest average δ34S values (14.2[Formula: see text]), but are only slightly less positive than laminated pyrite in footwall sedimentary rocks (δ34Smean = 15.1[Formula: see

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31

Cook, Nigel J., Christopher Halls, and Alan P. Boyle. "Deformation and metamorphism of massive sulphides at Sulitjelma, Norway." Mineralogical Magazine 57, no. 386 (1993): 67–81. http://dx.doi.org/10.1180/minmag.1993.057.386.07.

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AbstractThe copper-bearing stratabound pyritic massive sulphide bodies contained in metamorphosed basic eruptives of Ordovician age at Sulitjelma in Nordland County, Norway, form one of the important fields of sulphide mineralisation within the Köli Nappe Complex. The sulphide bodies and their enclosing rocks were subject to successive stages of penetrative deformation and recrystallisation during the cycle of metamorphism and tectonic transport caused by the Scandian Orogeny. Textures within the ores and the immediate envelope of schists show that strain was focused along the mineralised hori

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Borma, Laura De Simone, Maurício Ehrlich, and Maria Cláudia Barbosa. "Acidification and release of heavy metals in dredged sediments." Canadian Geotechnical Journal 40, no. 6 (2003): 1154–63. http://dx.doi.org/10.1139/t03-062.

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The oxidation of iron sulphides in dredged sediments can be a source of long-term contamination of surface and underground water. The adverse effects are related to a decrease in the ability of soil to retain heavy metals, which is caused by acidification. Laboratory tests were conducted, and pH variations and consequent release of heavy metals, especially Zn, Cu, and Pb, into the solution were monitored over time. The rate of pyrite oxidation was determined based on the sulphate production rate, through the stoichiometry of the oxidation reaction. Samples of sediments from the Jacarepaguá lag

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Butt, Muhammad Tahir, Naz Imtiaz, Naeem Abbas, and Rauf Ahmad Khan. "Sulphide Removal from Sewage Wastewater by Oxidation Technique." Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences 60, no. 1 (2017): 42–49. http://dx.doi.org/10.52763/pjsir.phys.sci.60.1.2017.42.49.

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In this study sewage wastewater samples were collected from different areas of Lahore, Pakistanfrom the WASA sewer system and then different chemical oxidizers: O2, KMNO4, H2O2 were used toremove the sulphides from these samples for selection of suitable oxidizer for treatment. From these results,it was observed that H2O2 was found effective and suitable for treatment and it can be used for this purpose.Theoretical and experimental doses required for treatment were similar. The KMNO4 oxidation reactionswere completed in five minutes time while H2O2 required more time and removed sulphide compl

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Frater, Kenneth Maxwell. "Mineralization at the Golden Grove Cu – Zn deposit, Western Australia. II: Deformation textures of the opaque minerals." Canadian Journal of Earth Sciences 22, no. 1 (1985): 15–26. http://dx.doi.org/10.1139/e85-002.

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Studies of the sulphide–magnetite fabric at Golden Grove. Western Australia, metamorphosed under conditions of lower to middle greenschist facies, indicate that pyrite and magnetite deformed in a brittle manner, whereas pyrrhotite, sphalerite, chalcopyrite, and galena deformed as ductile sulphides. In the accompanying silicate assemblage, pressure-solution deformation has been a significant deformation mechanism. An optical-microscope study of etched sphalerite reveals a wide range of microstructures indicative of ductile deformation, including lattice dislocations, subgrains and subboundaries

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Meyer, Edson, Asanda Bede, Nyengerai Zingwe, and Raymond Taziwa. "Metal Sulphides and Their Carbon Supported Composites as Platinum-Free Counter Electrodes in Dye-Sensitized Solar Cells: A Review." Materials 12, no. 12 (2019): 1980. http://dx.doi.org/10.3390/ma12121980.

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Energy sufficiency is a critical requirement for the economic prosperity of modern countries. Efficient harnessing of solar energy using technologies such as the dye-sensitized solar cell could solve the energy problem which persistently plagues developing countries. Despite having a simple operational procedure and modest power conversion efficiency of 13.8%, the dye-sensitized solar cell consists of an expensive platinum counter electrode which makes commercial success futile. Thus, this review intends to establish the progress researchers have attained in the development of sulphide based c

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Veneu, Diego Macedo, Thais Ferreira Marks Brasil Duque, Getúlio Gomes Oliveira Júnior, Rodrigo Barsante Gomides, Claudio Luiz Schneider, and Marisa Bezerra de Mello Monte. "SELECTIVE FLOTATION OF SULPHIDES FROM A GOLD MINING OPERATION." Engevista 19, no. 2 (2017): 447. http://dx.doi.org/10.22409/engevista.v19i2.861.

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This paper presents a study to obtain sulphide as byproducts of a concentrated cleaner of gold generated from the flotation process of sulphide gold ore of mine Morro do Ouro. Chemical analysis of the concentrated of gold showed a content of approximately 22.05% S, in the form of a bulk sulphides. The liberation of the sulphides was measured using a SEM with second generation automated mineralogy (MLA). For the chalcopyrite recovery step, the fraction of liberated gangue particles is above 90%, for galena up to 92% and sphalerite above 96%, in all sizes. Moreover, the fractions of particles of

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Duckworth, Rowena C., and David Rickard. "Sulphide mylonites from the Renström VMS deposit, Northern Sweden." Mineralogical Magazine 57, no. 386 (1993): 83–91. http://dx.doi.org/10.1180/minmag.1993.057.386.08.

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AbstractSulphide mylonites are fine-grained massive sulphides which have deformed in a plastic manner. In the Renström Zn-Pb-Cu-Ag-Au VMS deposit, one of several operating mines in the Early Proterozoic Skellefte District in Northern Sweden, shear-zone metamorphism has resulted in the development of mylonitic fabrics within the sulphides. The massive sulphide ore is hosted in a shallow submarine to subaerial volcano-sedimentary sequence which has been variably metamorphosed and deformed. Initially, the sequence underwent burial metamorphism which was followed by an amphibolite grade regional m

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Mikulski, Stanisław Z., Katarzyna Sadłowska, Janina Wiszniewska, and Rafał Małek. "Vanadium and Cobalt Occurrence in the Fe-Ti-V Oxide Deposits Related to Mesoproterozoic AMCG Complex in NE Poland." Applied Sciences 12, no. 12 (2022): 6277. http://dx.doi.org/10.3390/app12126277.

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On the basis of geochemical whole-rock and mineralogical point analyses, the concentrations of V and Co were determined in magnetite-ilmenite oxide ores, associated with sulphides, at the Krzemianka and Udryn deposits in the Mesoproterozoic Suwałki Anorthosite Massif (SAM) in NE Poland. EPMA analyses showed that the main carrier of vanadium was magnetite (mean = 0.42 wt%) and, to a lesser extent, ilmenite (mean = 0.14 wt%) and minor Al-spinels (mean = 0.04 wt%). In turn, cobalt was found mainly in the form of isomorphic substitutions in magmatic sulphides such as pentlandite (mean = 4.41 wt% C

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Gamanyuk, S. B., M. V. Kirilichev, and G. V. Babin. "Investigation of Formation Features of Sulphide Inclusions and their Distribution inside the Grain Depending upon the Conditions of Steel 20 Deoxidation." Materials Science Forum 945 (February 2019): 592–97. http://dx.doi.org/10.4028/www.scientific.net/msf.945.592.

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The paper reports laboratory test findings on the impact of steel oxidation level on distribution features of non-metallic inclusions in low-alloyed structural steels. An analysis of the effect of various oxidation methods of steel on the distribution and formation of non-metallic inclusions is made. The results reveal a relation between the amount of sulphide and oxisulphide inclusions formed and steel oxidation level. The release of oxisulphide from the melt is accompanied with a decrease in the amount of both oxygen and sulphur. After oxygen content has achieved an equilibrium value, only “

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Scott, R. A., R. A. D. Pattrick, and D. A. Polya. "Origin of sulphur in metamorphosed stratabound mineralisation from the Argyll Group Dalradian of Scotland." Transactions of the Royal Society of Edinburgh: Earth Sciences 82, no. 2 (1991): 91–98. http://dx.doi.org/10.1017/s0263593300007574.

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ABSTRACTSulphur isotopic data are presented for the four horizons of stratabound mineralisation in the Argyll Group Dalradian (Vendian) of the Central Highlands of Scotland. The styles of mineralisation reflect the stratigraphic and tectonic evolution of the Dalradian basin. The SEDEX-type Ba + (Zn + Pb) Loch Lyon Horizon has δ34S values for pyrite of +17% and for baryte of +27%. The baryte sulphur source was Dalradian sea-water although the values were modified by isotopic exchange with an H2S-rich metamorphic fluid derived from the surrounding graphitic schists. The sulphur source for sulphi

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Firstova, Anna, Tamara Stepanova, Anna Sukhanova, Georgy Cherkashov, and Irina Poroshina. "Au and Te Minerals in Seafloor Massive Sulphides from Semyenov-2 Hydrothermal Field, Mid-Atlantic Ridge." Minerals 9, no. 5 (2019): 294. http://dx.doi.org/10.3390/min9050294.

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The Semyenov-2 hydrothermal field located at 13°31′N of the Mid-Atlantic Ridge (MAR) is associated with an oceanic core complex (OCC) and hosted by peridotites and basalts with minor amounts of gabbro and plagiogranites. Seafloor massive sulphides (SMS) are represented by chimneys with zonality, massive sulphides without zonality and sulphide breccia cemented by opal and aragonite. The mean value of Au (20.6 ppm) and Te (40 ppm) is much higher than average for the MAR SMS deposits (3.2 ppm and 8.0 ppm, respectively). Generally, these high concentrations reflect the presence of a wide diversity

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Adomako-Ansah, K., A. Boateng, and A. Asante. "Implications of Ore Textures for Gold Recovery at Esaase Deposit, Asanko Gold Mine." Ghana Mining Journal 22, no. 1 (2022): 9–14. http://dx.doi.org/10.4314/gm.v22i1.2.

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The Esaase Deposit of the Asanko Gold Mine Ltd (AGM) contains a system of epigenetic gold-related quartz veins hosted by tightly folded and foliated metasedimentary rocks. The gold mineralisation is associated with disseminated sulphide minerals in the quartz-carbonate veins and within the alteration zones of the host metasedimentary rocks. AGM employs a combination of Gravity Concentration and Carbon-In-Leach (CIL) methods to recover its gold and this has resulted in a recovery rate that ranges from 81.3% to 94.1%. The high recovery rate (>90%) suggests that the gold is free and therefore

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Kotzé, E., and C. Gauert. "PGE distribution in the chromitite layers at Eastern Chrome Mine, Eastern Bushveld Complex, South Africa: A descriptive study with comparison of EPMA and LA-ICP-MS methods for detection of trace PGE in base metal sulphides." South African Journal of Geology 123, no. 4 (2020): 551–72. http://dx.doi.org/10.25131/sajg.123.0033.

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Abstract A descriptive petrographic study was carried out on the chromitites (LG-6 to UG-3a) of a single borehole from the Winterveld Chrome Mine, Eastern BC, along with analysis by both EPMA and LA-ICP-MS of the PGE contents of base metal sulphides (BMS) found within these layers. EPMA measurements were optimized to measure trace amounts of PGE by increased probe current and counting time, yielding very low detection limits for this method (12 to 38 ppm). However, analytical error proved to be very high (over ~30%) in samples that showed PGE values below 100 ppm. Also, the possibility of inte

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Mitchell, R. H., and F. Belton. "Niocalite-cuspidine solid solution and manganoan monticellite from natrocarbonatite, Oldoinyo Lengai, Tanzania." Mineralogical Magazine 68, no. 5 (2004): 787–99. http://dx.doi.org/10.1180/0026461046850219.

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AbstractLapilli and spatter of natrocarbonatite extruded from the T56B cone of Oldoinyo Lengai (Tanzania) in August 2003 are unusually rich in apatite, silicate, oxide and sulphide minerals. These minerals occur primarily within inclusions of quenched natrocarbonatite in gregoryite and fractures in nyerereite-gregoryite intergrowths. Silicates include members of the sodian cuspidine–niobian cuspidine–niocalite solid-solution series and manganoan monticellite. Oxides are represented by members of the magnesioferrite–jacobsite–magnetite solid-solution series. Sulphides occurring in decreasing or

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Cataliotti, Rosario Sergio, Giulio Paliani, and Sergio Santini. "Vibrational spectra of crystalline organic sulphides: dimethyl sulphide and diethyl sulphide." Canadian Journal of Physics 64, no. 1 (1986): 100–106. http://dx.doi.org/10.1139/p86-014.

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The vibrational spectra of crystalline dimethyl sulphide and diethyl sulphide have been measured at 77 K. The comparison with the liquid-state spectra has provided the correlation between the normal motions of the free molecules and those of the molecules in the Bravais unit.All Davydov components in the solid-state spectra have been assigned with the aid of polarized infrared radiation, and the analysis of the unit-cell symmetry of both molecules has been derived.

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Prols, Janis, Ērika Teirumnieka, and Edmunds Teirumnieks. "Distribution of iron and iron compounds in the Kemeri - Jaunkemeri occurence of sulphide water." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (June 17, 2015): 244. http://dx.doi.org/10.17770/etr2015vol2.626.

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Iron concentrations, distribution and migration forms, depending on pH and oxidation – reduction potential, were analyzed in case of the Kemeri-Jaunkemeri occurrence (area about 240 km<sup>2</sup>) of sulphide containing water (maximal sulphides concentration – 74 mg/l), located in Latvia. Iron content was investigated in 457 wells located within all area of occurrence. Those wells were installed to two aquifers: the Quarternary multi-aquifer and Salaspils aquifer, where occurrence of sulphide containing groundwater is distributed. All groundwater of occurrence is classified in fou

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Nayak, B. K., and S. K. Paul. "Nature of Fluid Inclusions in the Antimony Mineralisation Near Barashigri Glacier, Lahul and Spiti, Himachal Pradesh." Journal Geological Society of India 40, no. 4 (1992): 370–78. http://dx.doi.org/10.17491/jgsi/1992/400406.

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Abstract Antimony mineralisation occurs in the form of Sb-Pb-Zn and Sb sulphide veins in the fractures of the granites present close to the Tethyan Thrust near Barashigri glacier of Himachal Pradesh. SimiJar strike and dip patterns of the Tethyan Thrust and the mineralised fractures indicate that the mineralisation may be either syn- or post-thrusting event. Two types of primary inclusions observed in the quartz intimately associated with the sulphides are, (i) liquid + vapour (15-40% by volume) and (ii) liquid + vapour + dark crystal, the latter being found only in Sb-Pb-Zn veins. Heating and

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Baláz, Peter, E. Boldižárová, and E. Godočíková. "Preparation of Nanocrystalline Copper and Copper Silicon Sulphide by Mechanochemical Route." Materials Science Forum 480-481 (March 2005): 453–56. http://dx.doi.org/10.4028/www.scientific.net/msf.480-481.453.

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The composition and properties of powders prepared by high-energy milling of copper sulphides with silicon have been studied by methods of X-ray diffractometry and surface area measurement. The combination of several methods was utilized to develop a coherent picture of the process. The overall process of mechano-chemical transformations in copper sulphide-silicon system proceeds via complicated mechanism with several overlapping steps. Phase transformations in copper sulphide phases, the formation of elemetal nanocopper with X-ray determined particle size of 23 nm and creation of ternary sulp

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Spasova, Irena, Marina Nicolova, Plamen Georgiev, and Stoyan Groudev. "Comparative Variants of Microbial Pretreatment and Subsequent Chemical Leaching of a Gold-Bearing Sulphide Concentrate." Solid State Phenomena 262 (August 2017): 189–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.189.

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A sulphide concentrate containing 31.4% total sulphur (in which 30.7% was sulphidic), 31.8% iron, 8.0% arsenic, 18.5 g/t gold and 32.9 g/t silver finely disseminated in pyrite and arsenopyrite as the most essential components was subjected to microbial pretreatment to expose the precious metals from the sulphide matrix. Three different types of microbial cultures were tested for their ability to oxidize the sulphides and to expose the precious metals for the subsequent chemical leaching: mesophilic chemolithotrophic bacteria with a temperature optimum for their growth and activity at about 32

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Baidya, Tapan K., S. K. Mondal, V. Balaram, R. Parthasarathy, R. Verma, and P. K. Mathur. "PGE-Ag-Au Mineralization in a Cu-Fe-Ni Sulphide-Rich Breccia Zone of the Precambrian Nuasahi Ultramafic-Mafic Complex, Orissa, India." Journal Geological Society of India 54, no. 5 (1999): 473–82. http://dx.doi.org/10.17491/jgsi/1999/540503.

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Abstract The Precambrian ultramafic-mafic plutonic complex of Nuasahi, Orissa in the Eastern Indian Shield represents at least three suites of magmatic intrusion: (i) an interlayered sequence of enstatitite, websterite (± olivine), dunite, chromitite, harzburgite and orthopyroxenite; (ii) massive gabbroic suite with minor bodies of norite, anorthosite and bands of titaniferous magnetite and (iii) dykes and sills of dolerite and clinopyroxenite. A prominent breccia zone is developed near the interface of the first and second magmatic suites in the eastern part of the complex including the Shank

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