
Distribution of gold and sulfides at Lupin, Northwest
1994-10-1 The gold-bearing portions of the host iron-formations are characterized by the presence of multiple quartz veins and the pervasive replacement of grunerite by hornblende. In sparsely mineralized portions of the host iron-formation, zoning of sulfides about quartz veins is clearly seen, with the arsenopyrite halo being more restricted around the veins than the pyrrhotite halo.


Distribution of gold and sulfides at Lupin, Northwest
1996-8-1 J. A. Kerswill, J. R. Henderson, M. N. Henderson; Distribution of gold and sulfides at Lupin, Northwest Territories; discussion. Economic Geology 1996;; 91 (5): 957–964. doi: https://doi/10.2113/gsecongeo.91.5.957. Download citation file: Ris (Zotero) Refmanager; EasyBib; Bookends; Mendeley; Papers; EndNote; RefWorks; BibTex


THE OCCURRENCE OF GOLD IN SULFIDE DEPOSITS OF
2007-6-3 gold from 0.03 to 1,7 ppm Au. Zn-rich sulfides from the mound are commonly gold-rich, with an average of 9.5 ppm Au and a median value of 6.0 ppm Au (n = I5). White smokers from a low-temperature vent complex on the mound have gold contents of up to 42 ppm Au. In the white smokers, gold is present as submicroscopic particles or as


Distribution of trace elements between carbonaceous
2020-5-1 This study provides significant new insights into the distribution and deportment of trace elements between multiple generations of CM and associated sulfides in a sediment-hosted gold system: (1) In unaltered black shales, As, Se, Ni, Pb, and Cu are enriched in pyrite polyframboids relative to co-located CM1 grains, whereas a small amount of As, Pb, Bi, and U is hosted by CM1.


Mineralogical siting and distribution of gold in quartz
2014-3-5 The outermost crystal layer is usually gold-poor. The well-preserved distribution patterns also indicate that remobilization of gold from the sulfides played an insignificant role in


Distribution of trace elements between carbonaceous
Here we use synchrotron X-ray fluorescence microscopy (SXRF), laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS), and nanoscale secondary ion mass spectrometry (NanoSIMS) to characterize the distribution and deportment of trace elements between CM and sulfides from the Daqiao orogenic gold deposit, China.


The formation of gold‐rich seafloor sulfide deposits
2017-5-8 At the surface of the deposit, gold present within sulfides can be lost to dissolution by seawater as those sulfides are oxidized [Hannington et al., 1988]. Gold has also been described as part of the zone-refining model for the distribution of Cu and Zn within VMS deposits and seafloor sulfide mounds [Eldridge et al., 1983;


Gold in porphyry copper deposits: its abundance and
2002-10-1 If ore starts to deposit at 700°C, for instance, gold-saturated Cu–Fe sulfides (assumed here to consist of equal parts of chalcopyrite (ISS) and bornite) would contain about 800 ppm gold and would decrease to 200 ppm at 600°C . This drop in temperature of about 100°C could release almost 75% of the gold in the Cu–Fe sulfides.


Formation of gold and silver sulfides in the system
2011-4-1 The results of experimental studies together with data on the compositions of natural gold and silver sulfides suggest that the wide variations in Au and Ag contents in uytenbogaardtite and petrovskaite from different deposits are, most likely, due to the inhomogeneous structure of mineral grains and the presence of solid solutions Ag 2-χ Au χ S. It is assumed that gold and silver sulfides crystallizing from


THE OCCURRENCE OF GOLD IN SULFIDE DEPOSITS OF
2007-6-3 and distribution of gold in modern seafloor deposits, in particular, have helped to identify some of the primary controls on the enrichhent of gold in volcanogenic mrrssive sulfides (Hannington et al. 1986, Hannington & Scott 1989a" Henig et al. 1993). Among


The formation of gold‐rich seafloor sulfide deposits
2017-5-8 At the surface of the deposit, gold present within sulfides can be lost to dissolution by seawater as those sulfides are oxidized [Hannington et al., 1988]. Gold has also been described as part of the zone-refining model for the distribution of Cu and Zn within VMS deposits and seafloor sulfide mounds [Eldridge et al., 1983;


Gold in porphyry copper deposits: its abundance and
2002-10-1 Although the distribution of gold in several porphyry copper deposits has been determined by bulk assays, very little information is available on the gold content of metal sulfides and oxides that make up the ore assemblages. Previous analyses of the gold content of ore minerals are based largely on mineral separates.


Divining gold in seafloor polymetallic massive sulfide
2019-6-29 Hydrothermal fluids on the modern seafloor are important carriers of base and precious metals in a wide range of volcanic and tectonic settings. The concentrations and distribution, especially of gold and silver, in associated seafloor massive sulfide (SMS) deposits are strongly influenced by variable source rocks, fluid chemistry, and precipitation mechanisms.


Formation of gold and silver sulfides in the system
2011-4-1 Gold and silver sulfides were synthesized from melts Ag 2-χ Au χ S (χ = 0.1, 0.4, 0.8, 1.6) in the system Ag–Au–S with Au/Ag = 0.1–7.4. Optical microscopy, X-raying, electron probe microanalysis, and scanning electron microscopy were used to identify and analyze the solid products.


Gold enrichment in hydrothermal sulfides from the
2020-1-1 Gold-rich seafloor massive sulfide (SMS) deposits occur on the modern seafloor in various tectonic settings (Hannington et al., 2011, Monecke et al., 2014), including mid-ocean ridges, back-arc basins, and submarine volcanic arcs.A compilation of published chemical analyses of modern hydrothermal sulfides shows that the richest gold-bearing SMS deposits are associated mainly with


Mineralogical siting and distribution of gold in quartz
2014-3-5 The distribution of gold, its chemistry, paragenesis and mineralogical siting in the mesothermal ores of the major mines in the Ashanti belt, namely Konongo, Ashanti, Bogosu and Prestea mine, are the subject of this study. At the localities studied, gold is present in two main types of ores: 1. Quartz veins with free-milling gold.


Geochemical study of gold and arsenic mineralization
Element geochemistry of gold and arsenic and mineralogical features of their sulfides in the Carlin-type gold deposits of the Qinling region are discussed in this paper. The initial contents of ore-forming elements such as gold and arsenic are high in the ore-bearing rock series in the Qinling region. Furthermore, both the metals are concentrated mainly in the diagenetic pyrite.


CALCULATION OF THE DISTRIBUTION OF COBALT
2000-5-8 CALCULATION OF THE DISTRIBUTION OF COBALT CHLORIDE COMPLEXES AND THE SOLUBILITY OF COBALT SULFIDES IN HYDROTHERMAL SOLUTIONS TO 350°C. Scott A. Wood, Department of Geology and Geological Engineering, University of Idaho, Moscow, ID, 83844-3022, USA (E-mail: [email protected]).


The distribution of platinum-group elements, nickel
1995-2-1 Some of the marginal sulfides at Muskox are similar in composition to the Cu-PGE-rich Noril'sk-Talnakh sulfides and contain 16 percent Cu and up to 200ppm Pt + Pd + Au. However, most of the Muskox marginal sulfides were found to contain 3 to 10 percent Ni + Cu and intermediate levels of platinum-group elements (PGE) (1-10 ppm) similar to the


Volume 38 February 2000 Part 1 COMPARATIVE
2007-6-5 ent sulfides. Gold is commonly distributed inhomo-geneously within a single phase, and it is important to determine this variability, both in terms of absolute con-centration and of spatial distribution ( e.g., Genkin et al. 1998). Gold can also be located within a sulfide substi-tuting within the structure (“chemically bound gold”),


Mineralogical siting and distribution of gold in quartz
The well-preserved distribution patterns also indicate that remobilization of gold from the sulfides played an insignificant role in the ores of the Ashanti belt. Multiple quartz veining and growth zoning of the sulfides are interpreted as manifestations of multiple episodes


The formation of gold‐rich seafloor sulfide deposits
2017-5-8 At the surface of the deposit, gold present within sulfides can be lost to dissolution by seawater as those sulfides are oxidized [Hannington et al., 1988]. Gold has also been described as part of the zone-refining model for the distribution of Cu and Zn within VMS deposits and seafloor sulfide mounds [Eldridge et al., 1983;


Why Are There Gold Deposits at All? Scientists
2021-7-4 This arsenic-driven gold pump explains how these iron sulfides can massively capture and then release gold, so controlling ore deposit formation and distribution. In practical terms, it means that it will make it easier to find new sources of gold and other precious metals, which bind to arsenic-containing iron sulfides.


Evidence supporting micro-galvanic coupling in
2021-3-12 Electrical micro-junctions in metal sulfides drive electrochemical reactions with passing gold-bearing fluids, resulting in the deposition of gold, even from under-saturated ore fluids. Understanding the role micro-junctions play in the deposition of gold requires (a) imaging the electric field distribution of a galvanic couple near the surface to qualify the existence of an active micro-geo


Distribution of gold in the Earth’s crust SpringerLink
Abstract. The distribution of gold in the lithosphere bears critically on models for gold ore deposits. One group of workers advocates derivation of gold from large masses of rock through fluid-rock reactions in the deep crust (Kerrich, 1983; Groves and Phillips, 1987; Colvine et al., 1988) while others stress the importance of relatively restricted petrogenetic groups of rocks termed source


Associations between sulfides, carbonaceous material,
The distribution of Zn most closely follows that of CM, and was probably absorbed into the structure of the polyframboids during biogenic processes. The concentrations of Au and Ag are positively corrected with the Zn concentration in the polyframboids (R<SUP>2</SUP> of


7. DISTRIBUTION OF GOLD, PALLADIUM, PLATINUM,
2006-9-22 7. DISTRIBUTION OF GOLD, PALLADIUM, PLATINUM, RHODIUM, RUTHENIUM, AND IRIDIUM IN LEG 115 HOTSPOT BASALTS: IMPLICATIONS FOR MAGMATIC PROCESSES1 John D. Greenough2 and Brian J. Fryer3 ABSTRACT A comparison of 50 basalts recovered at Sites 706, 707, 713, and 715 along the Reunion hotspot trace during Ocean


Control of the Size and Distribution of Gold
2003-9-19 An increase in the cyclodextrin concentration effected a shift of the particle size range from 12−15 to 4−6 nm with uniform particle size distribution. The homogeneity of the synthesized gold nanoparticles was also evident from transmission electron micrographs (TEMs).


CALCULATION OF THE DISTRIBUTION OF COBALT
2000-5-8 CALCULATION OF THE DISTRIBUTION OF COBALT CHLORIDE COMPLEXES AND THE SOLUBILITY OF COBALT SULFIDES IN HYDROTHERMAL SOLUTIONS TO 350°C. Scott A. Wood, Department of Geology and Geological Engineering, University of Idaho, Moscow, ID, 83844-3022, USA (E-mail: [email protected]).
