 | Gloaguen, Eric, Branquet, Yannick, Boulvais, Philippe, Moëlo, Yves, Chauvel, Jean-Jacques, Chiappero, Pierre-Jacques, Marcoux, Eric (2007) Palaeozoic oolitic ironstone of the French Armorican Massif: a chemical and structural trap for orogenic base metal–As–Sb–Au mineralisation during Hercynian strike-slip deformation. Mineralium Deposita, 42 (4) 399-422 doi:10.1007/s00126-006-0120-4 | Journal (article/letter/editorial) | | the Saint-Aubin-des-Châteaux quarry (Armorican Hercynian belt, western France), an epigenetic hydrothermal...de Saint Amand, BP 6759, 45067 Orleans Cedex 2, France e-mail: e.gloaguen@brgm.fr P. Boulvais : J.-J....CNRS/Université de Rennes 1, 35042 Rennes Cedex, France Y. Moëlo Laboratoire de Chimie du Solide, Institut...la Houssinière, BP 32229, 44322 Nantes Cedex 3, France P.-J. Chiappero Département Histoire de la Terre...d’Histoire Naturelle, 61 rue Buffon, 75005 Paris, France Present address: E. Gloaguen BRGM, 3, avenue Claude-Guillemin |  | | Book (volume) | | l’Institut Muséum d’histoire naturelle DE LA FRANCE ET SES COLONIES DK description physique et chimique...strüvérite et la inonazite. MINÉHALÜGIE DE IA FRANCE 4 lima paru dès le premier abord vraisemblable...crocidolites. On y voit associés du quartz, de la pyrite, de l’albite et parfois des mouches de galène.... au N. de Tamatave, des veinules de calcite, pyrite, quartz, associés des plaquettes de xyloLile brun...0;09 1120 10,90 : ana- MlNKliALOGIK DK (i FRANCE ],A (>nOUPE DE L’APATÏTE APATITE Anjou. (T |  | | Journal (article/letter/editorial) | | series from the Laval syncline, Armorican Massif, France Jean-Bernard Edel 1 and Michel Coulon 2 I Laboratoire...Globe, 5 rue Descartes, 67084 Strasbourg Cedex (France) 2 Groupe d'Etudes Gbologiques de I'Universitb...Nancy L Facultb de Sciences, 51062 Reims Cedex (France) Received November 10, 1983 Revised version accepted...overprints. According to results from other regions of Brittany, this clockwise rotation involved the whole Armorican...are equivalent to the Sudetic-1 phase of eastern France [10]. The formations are folded in an Armorican |  | | Journal (article/letter/editorial) | | ores (Ozkaya et al., 2007; Nurmi et al., 2009; du Plessis et al., 2011). The subsequent oxidation of Fe2+...two-stage reactor configuration recently proposed by du Plessis et al. (2011) was used for biological Fe2+ oxidation...monoclinic and hexagonal pyrrhotites, chalcopyrite, and pyrite. Weathering of the primary ore results in gradual...unviolaritized pyrrhotite may be replaced by secondary pyrite and/or marcasite. QXRD analysis indicates the nickel...in the present work contains 36% pyrrhotite, 11% pyrite, 7% pentlandite, 7% violarite, and 3% chalcopyrite; |  | | Journal (article/letter/editorial) | | Jansen (19821 gives a maxtmum of 6000 m. and du PlessIs ( 1987) a figure of 7000 m or (quoted in a paper...T%zkelI(1975); De Bruiyn (1971a. 1971b. 1972a. 1972b); Du Plessis (1972a. 1972b): Jansen (1969,1970a, 1970b. 1975a...in the MainBasin. and correlates sequences. Du Plessis ( 19871 studied rocks lying to it with the Wilge...Sterk River Formation grades laterally into the du Plessis supported Jansen’s original theories of Alma Formation...berg Formation In the southwest. These in turn Plessis and Walraven (19901 suggest a pull-apart grade |  | | Journal (article/letter/editorial) | | specimens featured here were collected by Herman du Plessis HE MOUNTAIN KINGDOM OF LESOTHO is located in...Gauteng, South Africa brucec@uj.ac.za HERMAN du PLESSIS 10 Howick Gardens Webb Street, Farramere Benoni...round, thatched huts is on the left. Herman du Plessis photo, January 2017. 306 ROCKS & MINERALS Figure...geology at the University of Johannesburg. Herman du Plessis is an avid field collector. Most of his mineral...4 cm, Butha-Buthe district, Lesotho. Herman du Plessis specimen, Bruce Cairncross photo. Figure 8 (above |  | Cheng, Ka Yu, Acuña, Caroline C. Rubina, Boxall, Naomi J., Li, Jian, Collinson, David, Morris, Christina, du Plessis, Chris A., Streltsova, Natalia, Kaksonen, Anna H. (2021) Effect of Initial Cell Concentration on Bio-Oxidation of Pyrite before Gold Cyanidation. Minerals, 11 (8) 834 doi:10.3390/min11080834 | Journal (article/letter/editorial) | | Initial Cell Concentration on Bio-Oxidation of Pyrite before Gold Cyanidation Ka Yu Cheng 1,2 , Caroline...Collinson 3 , Christina Morris 1 , Chris A. du Plessis 4 , Natalia Streltsova 5 and Anna H. Kaksonen 1...Boxall, N.J.; Li, J.; Collinson, D.; Morris, C.; du Plessis, C.A.; Streltsova, N.; Kaksonen, A.H. Effect of...Initial Cell Concentration on Bio-Oxidation of Pyrite before Gold Cyanidation. Land and Water, Commonwealth...from 2.3 × 107 to 2.3 × 1010 cells mL−1 enhanced pyrite oxidation during the first week. However, by day |  | | Journal (article/letter/editorial) | | 1975; Rozendaal et al., 1986; Hartzer, 1989; Du Plessis and Walraven, 1990). There is close agreement amongst...et al., 1988, 1991; Du Plessis, 1990; Du Plessis and Walraven, 1990; Du Plessis 1990) and will not be...association with disseminations of tourmaline (schorl), pyrite, chalcopyrite, carbonates (dolomite-ankerite),... Coarse-grained cassiterite is associated with pyrite, ankerite, red potash feldspar and chalcopyrite...pseudomorphed and enhanced by tourmaline, hematite, pyrite, chalcopyrite and cassiterite. Most of the rocks |  | | Journal (article/letter/editorial) | | the initial adhesion of the cell onto coal and pyrite (Raichur et al., 1996). Initial bacterial attachment...ferrooxidans as a less toxic alternative to cyanide as a pyrite depressant in the desulphurisation of coal (Misra...al., 1996). Attachment of the bacterium to the pyrite surface resulted in significant surface chemical...that selective flotation of chalcopyrite from a pyrite/chalcopyrite mix can be obtained by preconditioning...bacterial cells preferentially adsorbed onto the pyrite surface, acting as a depressant during flotation |  | | Journal (article/letter/editorial) | | microCT: Case study Stephan G Le Roux, Anton Du Plessis, Abraham Rozendaal www.elsevier.com/locate/cageo...Cite this article as: Stephan G Le Roux, Anton Du Plessis and Abraham Rozendaal, The quantitative analysis...microCT: case study Stephan G LE ROUX 1, Anton DU PLESSIS 1, Abraham ROZENDAAL 2 1 CT Scanner Facility,...the core samples mainly consists of scheelite, pyrite, pyrrhotite and quartz as shown in Figure 5. However...in the various cores. 1) Sheelite; 2) Quartz; 3) Pyrite; 4) Pyrrhotite Fig 6: Theoretical X-ray attenuation |  | | Journal (article/letter/editorial) | | bioleaching costs in the range of US$2–3 (C. du Plessis, personal communication). The lower costs mean...about 3 mm thick. Photograph courtesy of Chris du Plessis, sample prepared by Angus McFarlane. too costly...used to extract copper from mines in the Iberian Pyrite Belt (in Portugal and Spain), Mynydd Parys (Wales) |  | | Journal (article/letter/editorial) | | bacteria could accelerate the oxidative dissolution of pyrite (FeS2 ), the most abundant sulfide mineral in the...uraninite) are associated with sulfidic minerals (pyrite, arsenopyrite, etc.) in some ore deposits. Depending... which acts as the primary chemical oxidant of pyrite and other sulfidic minerals; (ii) the “acid generators”...or so. The cobalt was present as “cobaltiferous pyrite” and initial laboratory and later pilot-scale tests...solubilisation of iron and cobalt from cobaltiferous pyrite present in mine tailings at Kasese, Uganda due |  | | Journal (article/letter/editorial) | | Formation (e.g. Rhodes, 1975; Du Plessis, 1976; Rhodes and Du Plessis, 1976), overlain by an agglomerate...attention but it is noted that chalcopyrite and pyrite (disseminated a n d / o r as amygdale fillings)...72 4.34 0.17 0.15 100.00 Mineralisation, mainly pyrite and arsenopyrite, is largely confined to a quartzite...siderite, quartz, chlorite, sphalerite, fayalite, pyrite, chalcopyrite, galena, magnetite, ilmenite and...Univ. Orange Free State, South Africa, 171pp Du Plessis, M.D. (1976) The Bushveld granites and associated |  | | Journal (article/letter/editorial) | | sericitization, abitization, secondary Fe oxides and NU pyrite (pseudomorphed by limonite and hematite) along...detachment are particularly laced with pyrite and contain single pyrite minerals of up to 6 cm D in diameter...diameter (Figure 6f). Euhedral pyrite is syn-tectonic and has grown during the formation of TE the S2...both deflected and overgrown by pyrite. Quartz strain shadows around pyrite grains are AC 4.2.2. Kalukwete...hematite, whereas original SC R sulphides, mainly pyrite, are only rarely preserved in the deep weathering |  | | Journal (article/letter/editorial) | | of South Africa (G, Fig. lb) is discussed by Du Plessis and Walraven (1990) who present a model that utilises...distribution and deformation of the Complex. Du Plessis and Walraven base their model on an evaluation...framework of the Bushveld Complex referenced by Du Plessis and Walraven (1990), is the Palala shear zone (Fig...many years. My thanks to you all. Drs. C. P. du Plessis and C.W. Stowe are thanked for their constructive... South Africa. J. Aft. Earth Sci. 13:45-63 Du Plessis, C.P., Walraven, F. (1990) The tectonic setting |  | | Journal (article/letter/editorial) | | 362±370 Ó Springer-Verlag 1997 ARTICLE G. du Plessis á G.J. Jonck á R. Kruger Potential low-grade iron...in the Editorial handling: P.G. Eriksson G. du Plessis (&) á R. Kruger Geology, Iron Ore Business, Iscor...lens-shaped bodies of serpentinite and chromitite (Du Plessis 1996). Intrusive pegmatite veins and diabase dykes...6.69 1.32 1.01 Weakly magnetic Garnet Quartz Pyrite Dolomite Apatite Chalcopyrite Calcite 0.40 0.37...Geological Society South Africa pp 461±467 Du Plessis G (1996) Iron ore geology, strategic business plan |  | Möller, V., Klemd, R., Joachimski, M., Barton, J.M. (2014) Hydrothermal controls on iron and lead mineralization on the farms Leeuwbosch and Cornwall, Thabazimbi District, South Africa. Ore Geology Reviews, 63. 40-63 doi:10.1016/j.oregeorev.2014.04.009 | Journal (article/letter/editorial) | | Thabazimbi (Fig. 2) (Anhaeusser and Poujol, 2004; Du Plessis and Clendenin, 1988). The Black Reef Formation...pinches out towards the northeast (Fig. 2; Du Plessis and Clendenin, 1988). To the east and north of...pre-existing zones of weakness in the basement (Du Plessis and Clendenin, 1988). The Thabazimbi–Murchison...Transvaal stratigraphy south of Thabazimbi (Du Plessis and Clendenin, 1988; Gutzmer et al., 2005) including...high silver contents of galena, the presence of pyrite and the gangue minerals siderite or Fe- and Mn-rich |  | O'Hara, Matthew J., Kellogg, Cyndi M., Parker, Cyrena M., Morrison, Samuel S., Corbey, Jordan F., Grate, Jay W. (2017) Decomposition of diverse solid inorganic matrices with molten ammonium bifluoride salt for constituent elemental analysis. Chemical Geology, 466. 341-351 doi:10.1016/j.chemgeo.2017.06.023 | Journal (article/letter/editorial) | | (NH4F·xHF), where x is commonly 1, 1.5, and 2 (du Plessis et al., 2016; Rakov and Mel'nichenko, 1984). Ammonium...performed at temperatures exceeding 600 °C (du Plessis et al., 2016; Nhlabathi et al., 2012). Recently...et al., 2012) and plasmadissociated zircon (du Plessis et al., 2016). (Laptash and Maslennikova, 2016)...apatite, zircon, tourmaline, rutile, ED magnetite, pyrite, marcasite, chalcopyrite, and kaolin. Given this...Institut Geopolymere, Saint-Quentin, France, pp. 37-58. du Plessis, W., Pienaar, A.D., Postma, C.J., Crouse |  | | Journal (article/letter/editorial) | | Transvaal were described in detail by Page and Du Plessis (1986). The Mooiplaas mine is situated in the southwestern...cement production plant is located next to the quarry activities. Mined are partly dolomitized giant...Dolerite dikes crosscutting the formation in the quarry area, including the weathered zone along the dikes...with an operating stripping ratio of 2: 1, the quarry moves about a million ton of rock per month. The...(compare Fig. 4). Before the limit was reached a new quarry was begun in the south of Zone 7. While this development |  | | Journal (issue) | | Wisconsin; Wavellite from the National limestone quarry near Mt. Pleasant Mills, Snyder Co., Pënnsylvania)...Arizona 181-183 Quartz concentrated around altered pyrite 189-191 In memoriam (Horst Windisch, John Baum...waar o.a. de Ameib farm ligt. Foto © Herman Du Plessis April 2012. Net zoals bij de Mile 72 werden ook...onder nummer 412/1. Dankwoord Dank aan Herman Du Plessis voor de toestemming om zijn foto te publiceren...duidelijk dat hij Hatchett meeneemt naar de High Down Quarry. Wavell was er dus al geweest. William was een |  | Núñez-Ramírez, Diola Marina, Solís-Soto, Aquiles, López-Miranda, Javier, Pereyra-Alférez, Benito, Rutiaga-Quiñónes, Miriam, Medina-Torres, Luis, Medrano-Roldán, Hiram (2011) Zinc bioleaching from an iron concentrate using Acidithiobacillus ferrooxidans strain from Hercules Mine of Coahuila, Mexico. International Journal of Minerals, Metallurgy, and Materials, 18 (5). 523-526 doi:10.1007/s12613-011-0472-3 | Journal (article/letter/editorial) | | Mine of Coahuila, Mexico, which mainly contained pyrite and pyrrhotite, was treated by the bioleaching...of about 95% in the iron concentrate. Keywords: pyrite; pyrrhotite; bioleaching; zinc 1. Introduction...to mineral iron concentrates containing mainly pyrite and pyrrhotite from Hercules Mine of Coahuila,...the main mineral phases in the concentrate were pyrite (FeS2) and pyrrhotite (FeS). The granulometric...References [1] D.E. Rawlings, D. Dew, and C.A. du Plessis, Biomineralization of metal-containing ores and |  | | Journal (article/letter/editorial) | | of Beaucouze, crossing the Maine to reach the Plessis by La Croix Verte. West of the Maine this band...d'avancement de la feuille geologique d'Angers. nat. O. France (1895), p. 13-16. E. RONDEAU. d'Angers (lg07)...and in an unexpected way the geological map of Brittany; it shows, moreover, what caution is needed in...probleme du Brioverien de Bretagne, CoR.S. Soc. geol. France, 2 mai (1927), pPo 102, 104. SUMMARY OF GEOLOGY...into magnetite and chlorite. Occasionally felspar, pyrite or quartz has replaced the oolite grains. The primitive |  | | Journal (article/letter/editorial) | | as a host of other minerals including hematite, pyrite, pyrrhotite, zircon, molybdenite and galena. SiO2...(Vearncombe et al., 1987; Vearncombe, 1988; Du Plessis, 1990; Vearncombe et al., 1992; Poujol et al.,...beryl, molybdenite, chalcopyrite, phenakite and pyrite are the major minerals associated with the emeralds...Molybdenite X Muscovite X X Phenakite X X Pyrite X X Pyrrhotite X Quartz X Scheelite X ...quartz and albite and apatite. Rare occurrence pyrite, magnetite, phlogopite, biotite, Tremolite, actinolite |  | López Valdivieso, A, Celedón Cervantes, T, Song, S, Robledo Cabrera, A, Laskowski, J.S (2004) Dextrin as a non-toxic depressant for pyrite in flotation with xanthates as collector. Minerals Engineering, 17 (9). 1001-1006 doi:10.1016/j.mineng.2004.04.003 | Journal (article/letter/editorial) | | com/locate/mineng Dextrin as a non-toxic depressant for pyrite in flotation with xanthates as collector A. L opez...2004; accepted 6 April 2004 Abstract Depression of pyrite flotation by dextrin has been investigated through...the oxidation of pyrite surface. Dextrin shows an isoelectric point at pH 4 and pyrite does at pH 6.4....and isopropyl xanthate occurs on the surface of pyrite and is explained to happen through distinct mechanisms...the surface. It is likely that dextrin depresses pyrite by enveloping the dixanthogen resulting from adsorption |  | | Journal (article/letter/editorial) | | the following activity–composition relationships: pyrite and pyrrhotite (Evans et al., 2010), amphibole...necessary to account for the presence of S as S) in pyrite and S2) in pyrrhotite 688 M. F. GAZLEY ET AL...shaded darker. The location and orientation of the pyrite–pyrrhotite transition is consistent with that shown...pyrrhotite stable at temperatures above 500 C, and pyrite stable at lower temperatures. The field within which...considered by Evans et al. (2010). In MG053, the pyrite–pyrrhotite transition is represented by a field |
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