 | | Journal (article/letter/editorial) | | Telluride mineralization at Ashanti gold mine, Ghana R. J. BOWELL, R. P. FOSTER Department of Geology...Road, London SW7 5BD Abstract Gold mineralization at the Ashanti Mine occurs in shear zones which are...zone. However, gold-rich telluride mineralization in veins in the hangingwall of the Obuasi ore zone at...at Ashanti appears to have post-dated development of the major gold-bearing shear zone. Complex assemblages...goethite, chalcocite, coloradoite, calaverite, sylvanite, kostovite, petzite, stutzite, hessite, altaite |  | | Journal (article/letter/editorial) | | Sulfide Oxidation and Production of Gossans, Ashanti Mine, Ghana R. J. Bowell a a Department of Geology...Sulfide Oxidation and Production of Gossans, Ashanti Mine, Ghana, International Geology Review, 36:8, 732-752...Sulfide Oxidation and Production of Gossans, Ashanti Mine, Ghana1 R. J. BOWELL Department of Geology,...the Justice mine, in the Ashanti goldfields of southwestern Ghana, chemical weathering of gold-bearing sulfide-rich...geochemical features that are diagnostic. In this type of gold mineralization, the most abundant sulfides are arsenopyrite |  | | Journal (article/letter/editorial) | | Supergene gold mineralogy at Ashanti, Ghana" Implications for the supergene behaviour of gold R. J. BOWELL*...Southampton SO9 5NH Abstract A t the Ashanti concession, Ghana, gold-bearing quartz veins and disseminated...hypogene ore zone. In the unweathered hypogene orebody, gold occurs as free grains in quartz, as sub-microscopic...disseminated arsenopyrite, as gold tellurides and as aurostibite. The gold is released from the hypogene...complexing. Dissolution and reprecipitation of the gold appears to have taken place largely in situ with |  | | Report (issue) | | From gold- and tellurium-bearing replacement copper deposits (Chelopech, Bulgaria; Campbell mine, Arizona...hessite, sylvanite (Buckeye Gulch, Colorado, USA); tellurium, altaite, calaverite, sylvanite, petzite...Chelopech deposit, Sofia, Bulgaria [TL]. In the Campbell mine, Bisbee, Cochise Co., Arizona, and at Buckeye Gulch...Kochbulak gold deposit, Chatkal-Kuramin Mountains, eastern Uzbekistan. In the Guilaizhuang gold deposit...Shandong Province, China. At the Ashanti gold deposit, Obuasi, Ghana. Name: To honor Professor Ivan Kostov |  | Okrugin, V. M., Andreeva, E., Etschmann, B., Pring, A., Li, K., Zhao, J., Griffiths, G., Lumpkin, G. R., Triani, G., Brugger, J. (2014) Microporous gold: Comparison of textures from Nature and experiments. American Mineralogist, 99 (5) 1171-1174 doi:10.2138/am.2014.4792 | Journal (article/letter/editorial) | | Volume 99, pages 1171–1174, 2014 Letter Microporous gold: Comparison of textures from Nature and experiments...Abstract Recent experiments have shown that microporous gold can be obtained via the oxidative dealloying of...calaverite (AuTe2), krennerite (Au3AgTe8), and sylvanite [(Au,Ag)2Te4] under mild hydrothermal conditions...The same Au textures have been found in natural gold-telluride ores from the Late Miocene epithermal... Russia. This confirms that natural microporous gold can form via the replacement of telluride minerals |  | Lawrence, D. M., Treloar, P. J., Rankin, A. H., Harbidge, P., Holliday, J. (2013) The Geology and Mineralogy of the Loulo Mining District, Mali, West Africa: Evidence for Two Distinct Styles of Orogenic Gold Mineralization. Economic Geology, 108 (2) 199-227 doi:10.2113/econgeo.108.2.199 | Journal (article/letter/editorial) | | Africa: Evidence for Two Distinct Styles of Orogenic Gold Mineralization DAVID M. LAWRENCE†,1,*, PETER J....JE2 4WJ Abstract Loulo is a world-class orogenic gold mining district in the Birimian terrane of western...shear zone, with gold mineralization largely linked to a transtensional event. The mine camp is divided...divided into two distinct styles of gold deposit on the basis of differing geologic characteristics. One group...tourmalinization (pre-, syn- and postmineralization). Gold lodes are Fe-rich (dominated by nickeloan pyrite) |  | | Journal (article/letter/editorial) | | of native gold and electrum, the gold telluride calaverite may well be the most important gold ore mineral...development of all other Colorado gold districts. Unlike most gold deposits, weathering of those characterized...fine-grained and dull, mustard-colored secondary gold that is disbursed as tiny particles as the individual...most exciting gold occurrences are either dominated by or contain significant amounts of gold tellurides...tellurides. Sylvanite, another important gold telluride, was featured in a previous Connoisseur’s Choice (Cook |  | Lambert-Smith, James S., Allibone, Andrew, Treloar, Peter J., Lawrence, David M., Boyce, Adrian J., Fanning, Mark (2020) Stable C, O, and S Isotope Record of Magmatic-Hydrothermal Interactions Between the Falémé Fe Skarn and the Loulo Au Systems in Western Mali. Economic Geology, 115 (7). 1537-1558 doi:10.5382/econgeo.4759 | Journal (article/letter/editorial) | | Park Place, Cardiff, CF10 3AT, United Kingdom Gold (Holdings) Ltd, 3rd Floor, Unity Chambers, 28 Halkett...the ultimate source of the ore fluids in orogenic gold deposits, with the metals scavenged from the same...sedimentary rocks, ca. 2110-2100 Ma Ahaufo, Yamfo Obuasi N 6º Bonikro Tarkwa, Iduapriem Golds deposit...2135-2100 Ma Archean rocks, Kenema-Man Domain Gold deposit size skarn Eburnean basin orogenic Eoeburnean...data Exploration targets 235E 230E 225E Au mine Gefa Faults, fractures and shear zones from drilling |  | | Journal (article/letter/editorial) | | Original Article (Au, Ag)Te2 Minerals from Epithermal Gold Deposits in Japan Kosei KOMURO1 and Masataka NAKATA2...calaverite (AuTe2), sylvanite (AuAgTe4) and krennerite ((Au, Ag)Te2) in epithermal gold telluride ores from...tellurium, to sylvanite, in the order of crystallization. A sample from Kawazu contains sylvanite and native...gray quartz part. The Teine sample also contains sylvanite and native tellurium with barite and quartz. The...patterns of XRD of calaverite, krennerite and sylvanite from Suzaki are almost identical to that of JCPDS |  | Lambert-Smith, James S., Lawrence, David M., Vargas, Carlos A., Boyce, Adrian J., Treloar, Peter J., Herbert, Sarah (2016) The Gounkoto Au deposit, West Africa: Constraints on ore genesis and volatile sources from petrological, fluid inclusion and stable isotope data. Ore Geology Reviews, 78. 606-622 doi:10.1016/j.oregeorev.2015.10.025 | Journal (article/letter/editorial) | | 2015 Keywords: Gounkoto gold deposit Fluid inclusions Stable isotopes Orogenic gold mineralisation Birimian...ounce orogenic gold deposits, situated along the Senegal–Mali Shear Zone. This west Malian gold belt represents...represents the largest West African orogenic gold district outside Ghana. The Gounkoto deposit is hosted to the...the south of the Gara and Yalea gold mines in the Kofi Series metasedimentary rocks. The ore body is structurally...deposits as well as numerous satellites. With the Loulo Mine (Gara and Yalea deposits) to the north, the Gounkoto |  | Cabri, L. J., Newville, M., Gordon, R. A., Crozier, E. D., Sutton, S. R., McMahon, G., Jiang, D.-T. (2000) CHEMICAL SPECIATION OF GOLD IN ARSENOPYRITE. The Canadian Mineralogist, 38 (5) 1265-1281 doi:10.2113/gscanmin.38.5.1265 | Journal (article/letter/editorial) | | 38, pp. 1265-1281 (2000) CHEMICAL SPECIATION OF GOLD IN ARSENOPYRITE LOUIS J. CABRI§ Canada Centre for...ABSTRACT The speciation of Au in gold-bearing arsenopyrite (FeAsS) from four gold deposits (Olympiada, Sentachan...mass spectrometry analyses and images. “Invisible” gold in arsenopyrite occurs in two apparently mutually...Bento and Sheba deposits contains chemically bound gold. With comparable constituent electronegativities...being covalent rather than ionic. The invisible gold in arsenopyrite from the Olympiada deposit, on the |  | | Report (issue) | | 2 osmium 190.2 iridium 192.2 platinum 195.1 gold 197.0 mercury 200.5 thallium 204.4 lead 207.2............................. R6 Iron Oxide-Copper-Gold Deposits............................................................................. R9 Orogenic Gold Deposits......................................................................... R11 Carlin-Type Gold Deposits..................................................................................... R15 Mine Waste Characteristics.......................... |  | | Journal (article/letter/editorial) | | on the polychronous nature of the giant Muruntau gold deposit from wall-rock alteration and ore paragenetic...on the polychronous nature of the giant Muruntau gold deposit from wall-rock alteration and ore paragenetic...on the polychronous nature of the giant Muruntau gold deposit from wall-rock alteration and ore paragenetic...in north-central Uzbekistan is one of the biggest gold deposits in the world with 45200 t of contained...KEY WORDS: intrusion-related gold, Muruntau, ore genesis, orogenic gold, Paleozoic, Uzbekistan. INTRODUCTION |  | | Journal (article/letter/editorial) | | stabilitiesof binary silvertelluridesandternary gold-silvertelluridescannotbe calculateddue to a lack...assemblages,to determinethe physicochemical conditionsof gold-silvertelluride formation.For example,the mutual...of reactionsin the systems dynamic data for most gold and/or silver tellurides. Te-O-H, Au-Te-C1-S-O-H...to understand the originof the BessieG epithermal gold telluride deposit.Unfortunately,details con-AG logKT-...stability of temperature: aqueoustelluriumspeciesand gold-silvertellurides in the systems Te-O-H, Au-C1-S-Te-O-H |  | | Journal (article/letter/editorial) | | control on gold distribution in As-free pyrite from the Dongping, Huangtuliang and Hougou gold deposits...February 2009 Editor: D. Rickard Keywords: Invisible gold As-free pyrite Tellurides In situ laser-ablation...Pyrite from the Dongping, Huangtuliang and Hougou gold deposits, Hebei Province, China, was investigated...invisible gold in As-free pyrite. The dataset shows excellent correspondence between measured high gold values...(Huangtuliang). Invisible gold is only at trace levels in the Hougou and gold-bearing telluride minerals |  | Grandjean da Costa, Felipe, Luiz Klein, Evandro, Harris, Chris, Roopnarain, Sherissa (2019) Fluid inclusion and stable isotope (O, H, C) constraints on the genesis of the Pedra Branca gold deposit, Troia Massif, Borborema Province, NE Brazil: An example of hypozonal orogenic gold mineralization. Ore Geology Reviews, 107. 476-500 doi:10.1016/j.oregeorev.2019.03.007 | Journal (article/letter/editorial) | | C) constraints on the genesis of the Pedra Branca gold deposit, Troia Massif, Borborema Province, NE Brazil:...Brazil: an example of hypozonal orogenic gold mineralization Felipe Grandjean da Costa, Evandro Luiz Klein...C) constraints on the genesis of the Pedra Branca gold deposit, Troia Massif, Borborema Province, NE Brazil:...Brazil: an example of hypozonal orogenic gold mineralization, Ore Geology Reviews (2019), doi: https://doi...C) constraints on the genesis of the Pedra Branca gold deposit, Troia Massif, Borborema Province, NE Brazil: |  | | Journal (issue) | | His family came to the Cripple Creek and Victor Gold Mining District in the early 1890s where they mined...mineral, and fossil collecting in the Pikes Peak region. The Pebble Pup program participates with the Future...like me used to single syllable Fig. 1. Bradbury Gold and Silver certificate from Custer words like dog...never issued certificate printed by the Bradbury Gold and Silver Company (Fig.1). Their principal place...locate information on any success of the Bradbury Gold and Silver Mining Company. Perhaps a visit to the |  | Xu, Wen-Gang, Fan, Hong-Rui, Hu, Fang-Fang, Santosh, M., Yang, Kui-Feng, Lan, Ting-Guang, Wen, Bo-Jie (2014) Gold mineralization in the Guilaizhuang deposit, southwestern Shandong Province, China: Insights from phase relations among sulfides, tellurides, selenides and oxides. Ore Geology Reviews, 56. 276-291 doi:10.1016/j.oregeorev.2013.06.010 | Journal (article/letter/editorial) | | journal homepage: www.elsevier.com/locate/oregeorev Gold mineralization in the Guilaizhuang deposit, southwestern...2013 Keywords: Gold mineralization Sulfide Telluride Selenide Phase relation Guilaizhuang gold deposit China...Guilaizhuang gold deposit is composed of limestone- and breccia-type ores. In the limestone ores, gold is hosted...whereas in the breccia ores, tellurides are the main gold carriers. Selenium often isomorphously substitutes...by phase diagrams at 250 °C, the temperature for gold precipitation in the Guilaizhuang deposit. According |  | | Report (issue) | | ~I . • -WAR PERIOD ~ 7.7.. . ~4-2 . I OJL GOLD • (1913- 1919) • • ' LONDON: PRINTED AND PUBLISHED...technical information) relative to the production of Gold will form a part of the volume or volumes on the...Chairman of the .Lt\.dvisory Technical Committee on Gold. . (Signed) R. A. 8. REDMAYNE, Chairman of Governors...OF GOLD ••• • •• • •• 8 MARKETING OF GOLD IN RECENT YEARS ••• ••• • •• 9 PRICE OF GOLD . -...••• Egypt and Anglo-Egyptian Sudan Gold Coast Colony and Ashanti ... Nigeria • •• ••• ••• ••• Rhodesia |  | | Conference Proceedings (Volume) | | Cover photograph: View of the Aitik open pit copper mine in the very north of Sweden. Mining operations started...copper, 51 700 tonnes of silver and 1,9 tonnes of gold. Photo: Olof Martinsson, Luleå University of Technology...Petrology of low-sulphide PGE ores of the Norilsk region ................................................Norman Pearson, Jan Kramers & Dmitry Kuzmin Orogenic gold deposits .. ................................................................... 1085 The orogenic gold mineral system . . ............................ |  | | Journal (article/letter/editorial) | | of the coupled behavior of gold and silver in hydrothermal processes: Gold fineness, Au/Ag ratios and their... Rickard Keywords: Hydrothermal gold deposits Ore geochemistry Gold fineness Au(Ag)-bearing pyrite Thermodynamic...modeling Au/Ag ratios a b s t r a c t An estimation of gold fineness deposited from aqueous sulphide–chloride...of hydrothermal gold deposits of different types are summarized. Wide ranges of gold fineness and low...ore-forming solutions (types I–III). High fineness gold and high values of (Au/Ag)ore ratio of Au–Te, Au–As |  | | Journal (article/letter/editorial) | | Invisible Gold Paragenesis and Geochemistry in Pyrite from Orogenic and Sediment-Hosted Gold Deposits...pyrite in ten gold deposits is used to determine the precise siting of invisible gold within pyrite,... and thus the timing of gold introduction relative to the growth of pyrite and related orogenic events...events. A spectrum of invisible gold relationships in pyrite has been observed which suggests that, relative...relative to orogenic pyrite growth, gold introduction in some deposits is early at the start of pyrite growth; |  | Doyle, M. G., Fletcher, I. R., Foster, J., Large, R. R., Mathur, R., McNaughton, N. J., Meffre, S., Muhling, J. R., Phillips, D., Rasmussen, B. (2015) Geochronological Constraints on the Tropicana Gold Deposit and Albany-Fraser Orogen, Western Australia. Economic Geology, 110 (2) 355-386 doi:10.2113/econgeo.110.2.355 | Journal (article/letter/editorial) | | 355–386 Geochronological Constraints on the Tropicana Gold Deposit and Albany-Fraser Orogen, Western Australia...Phillips,7 and Birger Rasmussen2 1 AngloGold Ashanti Ltd., L13 St. Martins Tower, 44 St. Georges Terrace...Victoria 3010, Australia Abstract Gold mineralization at the Tropicana mine occurs within the Plumridge terrane...conditions by the time of economic gold mineralization. The major gold-bearing pyrite-biotite-sericite mineralization...considered to provide the best direct measurement age of gold mineralization. The Tropicana Gneiss was derived |  | Alfonso, Pura, Ccolqque, Elsa, Garcia-Valles, Maite, Martínez, Arnau, Yubero, Maria Teresa, Anticoi, Hernan, Sidki-Rius, Nor (2023) Mineralogy and Mineral Chemistry of the Au-Ag-Te-(Bi-Se) San Luis Alta Deposit, Mid-South Peru. Minerals, 13 (4) 568 doi:10.3390/min13040568 | Journal (article/letter/editorial) | | was carried out in the San Luis Alta telluriderich gold deposit, mid-south Peru, to contribute towards determining...mineralization is considered an intrusion-related gold deposit located in the Arequipa segment of the Coastal...pyrite with minor chalcopyrite and galena. Native gold and telluride minerals are abundant. Mineral chemistry...mineralogy of veins was classified into four stages. Gold occurs in the three last stages either in large... more frequently, in grains of less than 10 µm. Gold appears as grains encapsulated in pyrite, Fe oxides |  | van Ryt, Matthew R., Sanislav, Ioan V., Dirks, Paul H.G.M., Huizenga, Jan M., Mturi, Marwa I., Kolling, Sergio L. (2017) Alteration paragenesis and the timing of mineralised quartz veins at the world-class Geita Hill gold deposit, Geita Greenstone Belt, Tanzania. Ore Geology Reviews, 91. 765-779 doi:10.1016/j.oregeorev.2017.08.023 | Journal (article/letter/editorial) | | mineralised quartz veins at the worldclass Geita Hill gold deposit, Geita Greenstone Belt, Tanzania Matthew...mineralised quartz veins at the world-class Geita Hill gold deposit, Geita Greenstone Belt, Tanzania, Ore Geology...mineralised quartz veins at the world-class Geita Hill gold deposit, Geita Greenstone Belt, Tanzania Matthew...Africa c Geita Gold Mine, Geita, P.O. Box 532, Geita Region, Tanzania Keywords: Archean gold; alteration...world-class Geita Hill deposit is one of the largest gold deposits located within the Geita Greenstone Belt |
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