 | 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 |  | | 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...plasmaoptical emission spectroscopy (ICP-OES). Sulphur analyses were performed using a LabFit CS-2000...jarosites,” Geochim. Cosmochim. Acta 67, 2063-2076. du Plessis, C. A., Slabbert, W., Hallberg, K. B., and Johnson...Ginige, M. P., Cheng, K. Y., Hilario, F., and du Plessis, C. A. (2014a). “Biohydrometallurgical iron oxidation |  | | Journal (article/letter/editorial) | | of ferrous iron (equation (1)) and/or reduced sulphur compounds (equation (2)) and produce ferric iron...is both ferrous iron and sulphur oxidising bacte ria. The oxidation of sulphur enhances the dissolution...dissolution of sulphide minerals by removing elemental sulphur that accumulates on mineral surfaces and by generating...was also achieved with A. ferrooxidans and the sulphur oxidising species Acidithiobacillus thiooxidans...that had been grown on media containing elemental sulphur or ferrous iron. The authors reported that cells |  | | 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...and chalcopyrite. This is reflected by increased sulphur, copper, cobalt, nickel and to a lesser extent...Univ. Pretoria, Pretoria, South Africa, 150 pp Du Plessis, C.P., Walraven, F. (1990) The tectonic setting |  | 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)...Institut Geopolymere, Saint-Quentin, France, pp. 37-58. du Plessis, W., Pienaar, A.D., Postma, C.J., Crouse...ammonium bifluoride when leaching monazite using sulphur acid. Procedia Chem, 10: 168-172. Faure, G., 1986 |  | | Journal (article/letter/editorial) | | by the microbial oxidation of added elemental sulphur (S0 ) (Equation (3)) can result in acid dissolution...biogenic production of sulphuric acid from elemental sulphur has been demonstrated as an indirect mechanism...metallurgic slag [12]. The final pH of the combined sulphur oxidation (acid production) and iron hydroxide...addition of an electron donor such as elemental sulphur. 6Fe3+ + S0 + 2H2 O Bacteria 6FeOOH + S0 + 10H+...medium Basal salts medium plus sulphur Basal salts medium plus sulphur Aerobic Aerobic Aerobic Aerobic |  | 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) | | 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...McGraw-Hill, Inc.: Singapore, 1991; pp. 371–372. Du Plessis, C.A. Recovery of Bioleaching Microbes. International...30 January 2003. Boxall, N.J.; Cheng, K.Y.; du Plessis, C.A.; Collinson, D.; Morris, C.; Streltsova, N...M.; Ginige, M.P.; Cheng, K.Y.; Hilario, F.; du Plessis, C.A. Biohydrometallurgical iron oxidation and |  | | Journal (article/letter/editorial) | | the nine-component NCFMASHTO system, after which sulphur was added and the pseudosection recalculated. For...oxygen can be negative, and that conversion of sulphur between oxidation states can affect the Fe3+ content...Plutonic during their time on site, especially E. du Plessis, for providing the opportunity, and ongoing financial... T.J.B., 2010. Internally consistent data for sulphur-bearing phases and application to the construction...Mineralogist, 92, 1181–1189. Gazley, M.F., Vry, J.K., du Plessis, E. & Handler, M.R., 2011. Application of hand-held |  | | Journal (issue) | | In addition, the new smelter will have a high sulphur recovery due to a single, continuous, stable gas...by the presence of country pavilions from China, France, Germany, South Africa, and the United Kingdom...regions, Africa is falling behind Canada, Australia, France, Germany, Japan, the United Kingdom and the United...appointed MD of Murray & Roberts Cementation, JAPIE DU PLESSIS, wants to go one step further. Not only is he keen...African mining sector. GERARD PETER reports. D u Plessis has been with Murray & Roberts Cementation since |  | | Journal (article/letter/editorial) | | share. H AY STACKER. - John H. M o o r e, Plessis, N. Y. This is a slide or chute, usually conSisting...being 3. lon!:er time to consume or destroy the sulphur. npon the 1Ire, and a piston to force the smoke |  | | Journal (article/letter/editorial) | | share. H AY STACKER. - John H. M o o r e, Plessis, N. Y. This is a slide or chute, usually conSisting...being 3. lon!:er time to consume or destroy the sulphur. npon the 1Ire, and a piston to force the smoke |  | | Report (chapter) | | moisture (wt%) 12.3 Ash (wt%, dry basis) 10.4 Sulphur, total (wt%, dry basis) 1.0 Fixed carbon (wt%,...hydrogenation. Fuel, 67, 1709-1711. PARKASH, S., DU PLESSIS, M. P., CAMERON,A. R. & KALKREUTH, W. O. 1984. |  | | Journal (article/letter/editorial) | | nano-particulate magnetite An acidophilic, iron- and sulphur-oxidising bacterial strain of A. ferrooxidans was...1992; Valdes et al., 2008) and besides iron and sulphur, bacteria derive essential nutrients such as carbon...solution reported to supress microbial growth (Du Plessis et al., 2007). However, complexation of F with...at sulphide surfaces. Minerals 4, 170–190. Du Plessis, C.A.A., Batty, J.D.D., Dew, D.W.W., 2007. Commercial |  | | Journal (article/letter/editorial) | | take place in three major steps: (1) oxidation of sulphur (Equation (1)); (2) oxidation of ferrous iron (Equation...availability of key elements such as potassium and sulphur (Figure 2). Jarosite, schwertmannite and ferrihydrite...2001, 65, 1367–1379. Hallberg, K.B.; Grail, B.M.; Plessis, C.A.D.; Johnson, D.B. Reductive dissolution of...Environ. Sci. Technol. 2013, 47, 6129–6136. Du Plessis, C.A.; Slabbert, W.; Hallberg, K.B.; Johnson, D |  | | Journal (article/letter/editorial) | | interacted with the floor-rocks, incorporated sulphur and precipitated the ‘‘Platreef’’ along the floor-rock...wedgeshaped, cone-intrusions inferred by Kleywegt and du Plessis (1986) and Meyer and De Beer (1987). Compare these...magmas have very little intrinsic sulphur in solution, and sulphur addition from some outside source...network of channels and xenoliths from which the sulphur was derived could be achieved. This is 465 a...interfingering, interaction and incorporation of sulphur-bearing xenoliths occurred, but flow-through was |  | | Journal (issue) | | footprint on the African continent and as MD PAM DU PLESSIS points out, there is more to come. GERARD PETER...pumps and other related products,” explains Du Plessis. This business model has reaped substantial dividends...facilities make up around 8 600 m2 under roof,” Du Plessis adds. Cutting costs, saving the environment In...comprehensive valve reconditioning service. Du Plessis states that there are substantial benefits in using...it also ensures that there is less wastage,” Du Plessis states. Invincible Valves has a fully equipped |  | | Journal (article/letter/editorial) | | also have been important in terms of gold and/or sulphur sources as discussed below. Tectonic setting and...oceanic crust is an enriched potential gold and sulphur source for the generation of orogenic gold systems...and the relative ease with which the gold and sulphur can be liberated from chemically reactive sulphide...energy and rock sequences with enhanced gold (and sulphur) in thin lithosphere. Trace element studies have...of orogens, possibly combined with the gold and sulphur fertility of leachable reservoirs, dictate whether |  | | Journal (article/letter/editorial) | | Platinum Ltd.: Johannesburg, South Africa, 2015. Du Plessis, A. Water Scarcity and Other Significant Challenges...Challenges of South Africa and Its Upper Vaal River; Du Plessis, A., Ed.; Springer: Cham, Germany, 2017; pp. 119–125...Catalytic Converter. In Proceedings of the 2009 Sulphur and Sulphuric Acid Conference, Sun City, South...roasting parameters for the ConRoast process with low-sulphur feedstock. J. S. Afr. Inst. Min. Metall. 2009, |  | | Report (chapter) | | with implications for the geochemistry of PGEs in sulphur– arsenic systems, ore genesis and noble metal (platinum...(Kilburn & Wacey 2014), with the exception of sulphur isotopes (Zhang et al. 2014a) and in isotopically...al. 2000) as well as the associated changes in sulphur isotope composition of pyrite (Barker et al. 2009)...magnesium (green), calcium (blue), titanium (pink) and sulphur (pale yellow) in (b) sample GQ1 and (c) the matrix...of the forming quartz vein in which they sit. Sulphur was introduced by the fluid and iron was consumed |  | | Journal (article/letter/editorial) | | characteristic sulphur, haswhen using The pH lower IEPs observed, at pH on = ~3.5, are characteristic sulphur, an...Australia, 2007; p. 18. Zanin, M.; Lambert, H.; Du Plessis, C.A. Lime use and functionality in sulphide mineral |  | | Journal (article/letter/editorial) | | automati lon!:er time to consume or destroy the sulphur. cally operated for such purpose, and the entire...share. H AY STACKER. - John H. M o o r e, Plessis, N. Y. This is a slide or chute, usually conSisting...rubber is made by in timately incorporatin� sulphur and coloring matter with the pure gum. pressing |  | | Book | | appreciated and used by Janety, goldsmith to Louis XVI of France, Chabaneau, a metal craftsman working in Spain...1988-89 and this is accepted by the UK, Italy and France. There is concern, however, that catalysts would...contain significantly more sulphur than subaerially erupted basalts. The sulphur in the submarine basalt...a silicate melt containing 0.15 per cent sulphur. Sulphur content of host glasses in the basalt described...1200*0 at an oxygen fugacity of -log 11.50 and a sulphur fugacity of -log 3.00. Euhedral olivine phenocrysts |  | | Journal (article/letter/editorial) | | Czech Republic Pyrenées, France Eastern Pyrenées, France Dauphiné Basin, France Selwyn Basin, YT, Canada...Bureau de Recherches Géologiques et Minières (BRGM), France, bioleach tanks on site were inoculated in 1998...887–898. Grayston, S.J.; Nevell, W.; Wainwright, M. Sulphur oxidation by fungi. Trans. Br. Mycol. Soc. 1986...Geochemical evidence for hydrothermal origin of sulphur, base metals and gold in Proterozoic metamorphosed...2181–2186. 116. Hallberg, K.B.; Grail, B.M.; du Plessis, C.A.; Johnson, D.B. Reductive dissolution of ferric |  | | Journal (article/letter/editorial) | | microCT: Case study—Stephan G. Le Roux, Anton Du Plessis, and Abraham Rozendaal 547 75 548 INTERESTING...siliciclastic-hosted stratabound fluorite deposits in Burgundy (France) inferred from mineral paragenetic sequence and...eastern India: Inferences on mantle melting and sulphur saturation history—M. Rajanikanta Singh, C. Manikyamba...He, and Song Dou 241 Geology, geochronology and sulphur isotope geochemistry of the black schist-hosted |  | | Journal (article/letter/editorial) | | to the Institut Universitaire Européen de la Mer France for Sr isotope analyses carried out by a Thermo-ionization...However, the chromitites are considered to be sulphur-poor (Von Gruenewaldt et al., 1986). In both borehole...analysed by mass spectrometer (Ifremer, Brest, France). Sr/86Sr ±2s (SEM) Standard 0.710246 0.000006...such as scavenging and complexation of PGE by sulphur, bismuth, tellurium, arsenic, as well as redistribution...“blebs”. Sulphur saturation in the MR can be achieved by mixing with relatively high-sulphur magmas entering |
|
Plessis quarry, Laz, Châteaulin, Finistère, Brittany, France