 | | 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 |  | Pigois, Jon-Philippe, Groves, David I., Fletcher, Ian R., McNaughton, Neal J., Snee, Lawrence W. (2003) Age constraints on Tarkwaian palaeoplacer and lode-gold formation in the Tarkwa-Damang district, SW Ghana. Mineralium Deposita, 38 (6) 695-714 doi:10.1007/s00126-003-0360-5 | Journal (article/letter/editorial) | | Tarkwaian palaeoplacer and lode-gold formation in the Tarkwa-Damang district, SW Ghana Received: 17 June 2002...epigenetic gold-forming events are recorded in the world-class gold province of southwest Ghana. A pre-Tarkwaian...Prestea) to giant (e.g. Obuasi) orogenic gold deposits which have made the region famous for more than 2...against derivation of the palaeoplacer gold from an orogenic gold source related to the compressional phase... Instead, they suggest that the gold source was either orogenic gold lodes related to an earlier compressional |  | | Journal (article/letter/editorial) | | formed 26 between ca. 2.5 - 2.3 Ga, nearly all gold, porphyry copper, lead-zinc and sedimentary 27...distinguished by major Precambrian 30 IOCG’s, copper-gold that formed at ca. 2.1 Ga and approx. 680 Ma, and... Mineral Deposit Database highlight that gold and non-gold commodities formed in multiple 37 phases...of iron 38 ore, nickel sulphides, diamonds and gold in the earth’s crust. The pre-Eburnean or Tangaean-...EoEburnean-Eburnean I Event yielded gold, and the major Eburnean Orogeny yielded gold, 40 iron ore, manganese |  | | Journal (article/letter/editorial) | | satellite orebodies is only 4 m. Except for a small gossan (Fig. 4), all information on the deposit is from...zone Archean Mali Niger Burkina Faso Guinea Ghana To- Bego nin Côte d’lvoire km 0 100 200 FIG....Geologisches Jahrbuch, in prep). Inset: Perkoa-Poura region. Abbreviations: Bir. = Birimian, r. = rocks. Oblique...rhyolite from the Larafella section of the Poura gold deposit, 90 km south of Perkoa (2195 ± 2 Ma; Table...commun., 1999), as well as those of the Perkoa gossan reported by Napon (1988), are strongly weathered |  | | Journal (article/letter/editorial) | | pp. S307–S320 Supergene gold enrichment in the Castromil-Serra da Quinta gold deposit, NW Portugal C....Associate Editor: John Bowles] ABSTR ACT Several gold deposits hosted mainly by Variscan granites and...surface galleries. The Castromil-Serra da Quinta gold deposit is an important example of such a mined...exploited the gossan formed from the weathering of primary mineralization. The gossan is composed essentially...Different modes of gold occurrence are defined based on metallographic studies of both the gossan and drill cores |  | | Journal (volume) | | Arizona Strike *257 W. R. Feldtmann Ashanti Gold IMines 127 Ashanti Goldfields Corporation Report. 124...Australian Metal Position H. R. Sleeinan. 33 Australian Mine Tax . . . . . . . . *206 47 247 Report...Boovsens 126 218 Boston Creek, Ontario Bradeu Copper Mine, Smelting at. (m.d.) ... 117 344 Bragg. W. H X-rays...110 {m.d.) .... Balaghat Developments Balaghat Gold . ; . . .- . . . . . Hill, Xorth ....Institute and a Charter Canadian Mine Taxes 187, F. H. Hamilton. Canadian Mine Taxes Cape Copper Report .. |  | Chen, Ping, Chen, Tianhu, Xie, Qiaoqin, Xu, Liang, Liu, Haibo, Zhou, Yuefei (2018) Mineralogy and geochemistry of limonite as a weathering product of ilvaite in the Yeshan iron deposit, Tongling, China. Clays and Clay Minerals, 66 (2) 190-207 doi:10.1346/ccmn.2018.064102a | Journal (article/letter/editorial) | | limonite are also referred to as ‘gossan’ and this is an important carrier of gold (Bowell, 2010; Velasco et...research has focused mainly on the genesis of gossan gold deposits, the regularity of their occurrences...stub with double-sided tape and coating thinly with gold by spraying for 120 s. The FE-SEM images were obtained...geological investigation of a mine; (b) second geological investigation of a mine, its location is equivalent... 1976, 1977, 1978; Carlo et al., 1983); but the mine water is usually more acidic and oxygen-rich which |  | | 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) | | org/10.1007/s00126-019-00868-6 ARTICLE Supergene gold in silcrete as a vector to the Scuddles volcanic...weathering under variable timing and climatic conditions. Gold grains are pure, nanocrystalline (up to 10 nm) and...Ag, I, Br, Cl, Sb, Sn, Bi, Hg, Mo, W, Te, and Ge. Gold and Ag in the supergene weathering profile were...may have taken place in response to a rise in pH. Gold was likely remobilized with kaolinite from the surface...silcrete in finding buried VMS, particularly if the gossan is absent. Keywords Golden Grove . Exploration |  | | Journal (issue) | | for Wiseman Chipangamate’s excellent project on the Mimosa Mine and for graduating the best geology student...Shangani and Epoch the soils led to nickel-rich gossan, but that was rare at Damba-Silwane. The gossans...seriously negated where the gossan was leached, and at Selibe where the gossan was obscured by calcrete...serpentine varied from 12:1 to 15:1, but in the King Mine, there was no copper at all. First, you had to determine...was too good to be true; the old Bay Horse Mine, where gold occurs with chalcopyrite could be the source |  | | 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) | | effect of iron-oxidising bacteria on the stability of gold (I) thiosulphate complex Jeremiah Shuster a,⁎, Trudy...Editor: J. Fein Keywords: Gold (I) thiosulphate Gold sulphide Colloidal gold Biogeochemistry Iron-oxidising...iron-oxidising bacteria on the stability of soluble gold (I) thiosulphate. Stationary phase cultures and...were exposed to gold (I) thiosulphate solutions forming different experimental-gold systems. These experimental...experimental systems rapidly removed gold from solutions containing 0.002 mM–20 mM gold thiosulphate. Scanning and |  | | Catalog/List | | 2-tx1-tx1 ", L3 . 2Sp 8. NATIVE ARS ENIC. 'Kusa Mine , ne ar 8au , Sar awak , 80rneo. Da rk grey cryst...chist. 3x2x1 i ", £4 .Sop 1S. BROCHANT ITE. Mexic o Mine , Ca ldbeck Fell s, Cumberland. Very choice bri...veinstuff. 4x3i",t14.00 . 16. CALCITE. Castro Virreyna Mine, nea r ima , Peru. Unusu al creamy large l enticul...specimen ' 1tx1tx1t" , . £4. 50p . 17. CALCITE. Stank Mine , Ulverstone , N. La ncashire. Fine creamy to colourless...matrix. 1x1 ", £2,Sop 1 24. CHALC OCITE . Botall ack Mine , St. Just , Cornwa ll. Fi ne s harp hexagona l |  | | Journal (article/letter/editorial) | | RESEARCH ARTICLE Morphology and chemistry of placer gold in the Bagrote and Dainter streams, northern Pakistan:...location of regional placer gold mining. However, no in situ hydrothermal gold deposits have been discovered...discovered in this region. Here, we report the textural, morphological, and geochemical characteristics of...of placer gold from the stream sediments of the Bagrote and Dainter valleys with a view to trace the provenance...features of the studied gold grains indicate proximal source mineralization. The gold grains display a microtexture |  | | Journal (article/letter/editorial) | | Placer Gold from the Rio Neuquén, Argentina: Implications for the Gold Budget in Placer Gold Formation...variable amounts of placer gold. In addition to rounded, detrital placer gold, the sediments also contain...crystalline gold (type 1 gold), which occurs as overgrowths on detrital placer gold cores. Type 1 gold is locally...locally rimmed by gold with a wormlike or crystalline texture (type 2 gold). The chemistry of the primary...origin. Type 1 gold is composed of virtually pure gold (>98 at. % Au) and type 2 gold is an Au-Hg amalgam |  | | Journal (article/letter/editorial) | | minerals Review Reflecting on Gold Geomicrobiology Research: Thoughts and Considerations for Future...2018 Abstract: Research in gold (Au) geomicrobiology has developed extensively over...Au-biogeochemical-cycle begins with the liberation of gold-silver particles from a primary host rock, by physical... Keywords: gold-biogeochemical-cycling; microorganisms; bacteria; biomineralization; gold nanoparticles;...nanoparticles; soluble gold; secondary gold; gold dissolution/reprecipitation; gold transport; gold kinetic mobility; |  | | 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 |  | | Journal (article/letter/editorial) | | Bi2Te from the São Sebastião gold deposit, Brazil: Implications for lode-gold mineralization in Minas Gerais—...minerals in the Platreef at Zwartfontein, Akanani project, northern Bushveld Complex, South Africa—Fanus...metamorphism, metasomatism and gold mineralisation at Plutonic gold mine, Marymia Inlier, Western Australia—M...alteration footprints associated with sediment-hosted gold mineralisation at Mt Olympus (Ashburton Basin, Western...interpretation of selected drill cores from orogenic gold deposits in central Victoria, Australia—D. Arne |  | | Journal (issue) | | experience in the development of mineral deposits in the region since the 1950’s, and in particular the development...25th October with a visit to the Bougai platinum project in the Selukwe Subchamber of the Great Dyke where...65% of the country’s exports made up of pgms ~45%, gold ~22%, diamonds ~11%, ferrochrome ~8% and others...At first the search was for coloured stones and gold, and then in Zambia by using vegetation as a guide...inception of the Geological Survey to 1987, when the Gold Refinery and Remote Sensing facilities were implemented |  | | Journal (article/letter/editorial) | | 111–112, Johannesburg, S.A.I.M.M. The Letlhakane project; a case study in complex uranium mineralogy and...Sandton 2146, South Africa The Letlhakane uranium project in Botswana is characterised by a near-surface...geometallurgy is not new, but its modern holistic mine value chain application can be considered a critical...provide the practitioner with a means to optimise the mine schedule and metallurgical processes. The geometallurgical...reflects the modern trend towards efficient project evaluation, mine optimisation and risk management. With |  | Hollis, S.P., Yeats, C.J., Wyche, S., Barnes, S.J., Ivanic, T.J., Belford, S.M., Davidson, G.J., Roache, A.J., Wingate, M.T.D. (2015) A review of volcanic-hosted massive sulfide (VHMS) mineralization in the Archaean Yilgarn Craton, Western Australia: Tectonic, stratigraphic and geochemical associations. Precambrian Research, 260. 113-135 doi:10.1016/j.precamres.2014.11.002 | Journal (article/letter/editorial) | | University of Tasmania, 7001, Australia e AngloGold Ashanti Australia Ltd, Level 13, 44 St. Georges Terrace...was gossan searching (Butt, 2004) coupled with geophysics. One substantial find was made at Gossan Hill...1980s, the general lack of success and an increasing gold price saw a change in focus and VHMS mineralization...(%) Pb (%) Youanmi Murchison ca. 2960–2930 Gossan Hill Scuddles Amity 1971 1979 1999 2.6 1.2 1...Hougoumont 1999 Catalpa Ethel Xantho Cambewarra Gossan Valley/Felix 1999 2000 2003 2003 1971–1972/1979 |  | | Catalog/List | | massive with minor Celsian and Bementite from Benallt Mine, Lleyn, Wales, (Recently tested by XRD) lxl £4 lx2...£15 £6 88 ADAMITE Ojuela Mine, Mapimi, Mexico 1036 ALSTONITE Fallowfield Mine, Northumberland Colourless...x2 £ 1.50 2x2 £3 Al SO/4 767 ■ AJOITE Christmas Mine, Gila County, Arizona USA 14 ALUMINITE Railway cutting...~-------·-·-- ·· -·· 1077 ■■ ALLOPHANE Hawkswood Mine, Cornwall 933 ANATASE Hingston Quarry,Cornwall Black...Kola Russia 501 ALLOPHANE New East Wheal Russell mine, Devon ,England grey bleby small botryoidal with |  | | Catalog/List | | £10 2x2 £15 Ix! £3 lx2 £6 I · 88 ADAMITE Ojuela Mine, Mapimi, Mexico Colourless to yellow small crystals...£10 2x3 £15 Na Ca SiO F 7fJ 7 ■ AJOITE Christmas Mine, Gila County, Arizona USA Blue veinlets in matrix...5cm £4 no/2 feldspar 37 ANCYLITE Ce Dark Star Mine,Ravalli County, Montana U.S.A Rich pinkish fine...£7.50 Ag Sb 501 ALLOPHANE New East Wheal Russell mine, Devon ,England grey bleby small botryoidal with...£8 2x3 £12 236 1129 • ALMAN DINE Brastad iron Mine near Arendal ,Norway Rich fine grained solid grainlike |  | Yang, Feng, Zhai, Wei, Sun, Xiaoming, Klemd, Reiner, Sun, Yanyan, Wu, Yunshan, Hua, Renmin, Zheng, Siqi (2019) Fluid Inclusions and Stable Isotopic Characteristics of the Yaoling Tungsten Deposit in South China: Metallogenetic Constraints. Resource Geology, 69 (1) 107-122 doi:10.1111/rge.12188 | Journal (article/letter/editorial) | | similar to those of vein quartz reported from orogenic gold deposits (e.g., Ridley & Diamond, 2000) but distinct...deposit is located in the southwest of the Nanling region (Fig. 2a). This deposit and the adjacent Shirenzhang...W-Sn polymetallic mineralization in the Nanling region (Mao et al., 2008). A hydrothermal metasomatic...from that of most granite-related tungstentin and gold deposits, for which the presence of highsalinity...Bolivia (Thorn, 1988), the intrusion-related Telfer gold-copper deposit in Western Australia (Schindler et |  | | Catalog/List | | ___ 2x2£3 ___ - -----~ - ~014_ _ 88 ADAMITE Ojuela Mine, Mapimi, Mexico 69 ALUMOHYDROCALCITE South Bay,...- - --··---- - - - - - · . 767 AJOITE Christmas Mine, Gila County, Arizona USA 17 ANAL CITE Talisker...North Sweden 501 ALLOPHANE New East Whcal Russell mine, Devon ,England variety VIRIDINE (Mangan rich variety)...217 ANDORITE San Jose Mine, Oruro, Bolivia 1129 ■ ALMANDINE Brnstad iron Mine near Arendnl ,Norway Pure...Bcnallt Minc,Llcyn. Wales 1036 ALSTONITE Fnllowlielcl Mine, Northumberland White masses in malrix wilh micro |
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