 | Bogossian, Jessica, Hagemann, Steffen G., Rodrigues, Vinicius G., Lobato, Lydia Maria, Roberts, Malcolm (2020) Hydrothermal alteration and mineralization in the Faina greenstone belt: evidence from the Cascavel and Sertão orogenic gold deposits. Ore Geology Reviews, 119. 103293 doi:10.1016/j.oregeorev.2019.103293 | Journal (article/letter/editorial) | | belt: evidence from the Cascavel and Sertão orogenic gold deposits Jessica Bogossian, Steffen G. Hagemann...belt: evidence from the Cascavel and Sertão orogenic gold deposits, Ore Geology Reviews (2019), doi: https://doi...belt: evidence from the Cascavel and Sertão orogenic gold deposits” JESSICA BOGOSSIAN,1 STEFFEN G. HAGEMANN...Highway, Crawley WA 6009, Australia 2 Orinoco Gold Limited 3 Universidade Federal de Minas Gerais... Belo Horizonte, Minas Gerais, CEP 31270-901, Brazil 4 Centre for Microscopy, Characterisation and |  | Jost, Hardy, Chemale, Farid, Dussin, Ivo Antônio, Tassinari, Colombo Celso Gaeta, Martins, Rodrigo (2010) A U–Pb zircon Paleoproterozoic age for the metasedimentary host rocks and gold mineralization of the Crixás greenstone belt, Goiás, Central Brazil. Ore Geology Reviews, 37 (2) 127-139 doi:10.1016/j.oregeorev.2010.01.003 | Journal (article/letter/editorial) | | host rocks and gold mineralization of the Crixás greenstone belt, Goiás, Central Brazil Hardy Jost a,⁎...Ribeiro, Brasília, 70910-900, Distrito Federal, Brazil Núcleo de Geologia, Universidade Federal de Sergipe...Jardim Rosa Elze, São Cristóvão, Sergipe, 49000-000, Brazil Instituto de Geociências, Universidade Federal...Vale, Caixa Postal 15001, Porto Alegre, 91501-970, Brazil d Instituto de Geociências, Universidade de São...Paulo, Brazil e Departamento de Exploração, Mineração Serra Grande, Caixa Postal 24, Crixás, Goiás, 76510-000 |  | | Journal (issue) | | Pearl Testing 36 Emeralds from South America – Brazil and Colombia 48 Clinohumite – The Mountain Fire...rise of new economies such as China, India, and Brazil. The challenges have been numerous as these new...every ICA member, I would like to thank the IBGM in Brazil along with every company, individual, and government...Opening a Tsavorite Mine T anzaniteOne Limited is working towards opening a tsavorite mine not far from its...Tanzania, about 20 kilometers from its tanzanite mine. The project has a total indicated resource of 1 |  | e Silva, Jonas Mota, Ferreira Filho, Cesar Fonseca, Bühn, Bernhard, Dantas, Elton Luiz (2011) Geology, petrology and geochemistry of the “Americano do Brasil” layered intrusion, central Brazil, and its Ni–Cu sulfide deposits. Mineralium Deposita, 46 (1) 57-90 doi:10.1007/s00126-010-0312-9 | Journal (article/letter/editorial) | | “Americano do Brasil” layered intrusion, central Brazil, and its Ni–Cu sulfide deposits Jonas Mota e Silva...during the Brasiliano/Pan-African Orogenic Cycle in Brazil. The medium-sized ABC consists of interlayered...Universidade de Brasília, Brasília, DF 70910-900, Brazil e-mail: cesarf@unb.br J. M. e Silva e-mail: jonas...Synorogenic layered intrusion . Mafic–ultramafic . Brazil . Americano do Brasil Introduction Magmatic Ni–Cu...“Americano do Brasil” Complex (ABC) in central Brazil is hosted by a Neoproterozoic synorogenic mafic– |  | | Journal (article/letter/editorial) | | 201-C, Salvador, 40170-290, Bahia, Brazil b Geological Survey of Brazil (CPRM)-Av. Pasteur, 404, Urca, Rio...Rio de Janeiro, 22290-240, Rio de Janeiro, Brazil Received 2 May 2004; accepted 1 May 2006 Available...from Venezuela (Imataca Complex), and others from Brazil (Quadrilátero Ferrífero, Itabira, and Guanhães)...mentioning that the Serra dos Carajás Basin in northern Brazil is older. It contains the worlds' largest iron...metamorphosed Caraíba deposit, Curaçá Valley, Bahia, Brazil. This is an unusual, strongly deformed copper deposit |  | | Journal (article/letter/editorial) | | State, Brazil CARLOS ALBERTO SPIER† Minerações Brasileiras Reunidas, Av. de Ligação 3000, Nova Lima, MG...MG, 34000-000, Brazil AND CESAR FONSECA FERREIRA FILHO Instituto de Geociências, Universidade de Brasília-UnB...Universitário, Asa Norte, Brasília-DF, 70910-900, Brazil Abstract The chromite deposits of the Bacuri mafic-ultramafic...represent the second largest reserves of chromite in Brazil. The complex is a major stratiform complex overprinted...Group) within the 400 km2 Vila Nova project in the Amapá State, Brazil (Fig. 1). The deposit’s measured |  | Vial, D.S., Abreu, G.C., Schubert, G., Ribeiro-Rodrigues, L.C. (2007) Smaller gold deposits in the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero, Brazil. Ore Geology Reviews, 32 (3) 651-673 doi:10.1016/j.oregeorev.2005.01.004 | Journal (article/letter/editorial) | | Smaller gold deposits in the Archean Rio das Velhas greenstone belt, Quadrilátero Ferrífero, Brazil D.S....Vale do Rio Doce, BR 381, km 450, Santa Luzia, MG, Brazil Instituto de Geociências da Universidade de São...São Paulo, Rua Major Solbiat, 226, Torrinha, SP, Brazil Fundação Educacional de Caratinga, Fazenda Experimental...BR-116, Km 526, Bairro das Graças, Caratinga, MG, Brazil b c Received 26 June 2003; accepted 2 January...Ferrífero is a classic gold province on a global scale, with hundreds of individual gold occurrences in the |  | | Journal (article/letter/editorial) | | allowing the widespread replacement of primary pentlandite by awaruite and heazlewoodite due to accompanying...extractable heazlewoodite, awaruite, and Ni-rich pentlandite are observed in rocks that have been completely...or CH4 gas generation is a matter of concern for mine safety (Cook, 1998). In retrograde tectonic settings...brucite-like component of serpentine into magnetite. Field and experimental studies provide evidence that nickel...of key lithofacies that can be recognized in the field as being potentially associated with H2 gas generation |  | | | | -and rocks. . -.* What you will need out.in the field ~“ Various geological locations iin Canada© Physical...surrounded ce ne white calcite, from!iheBluebell Mine; Riondel, Digitized by the Internet Archive...rock photographs; Donna Naughton took a number of field photographs and prepared the Geological Regions...Mineral or Rock? Origins of Minerals and Rocks Field Equipment Where to Collect Home Equipment Cataloguing...looked at as a continuous cycle. Field Equipment Keep your field equipment simple but of high quality |  | | Journal (article/letter/editorial) | | AND DEFORMED BACURI COMPLEX, AMAPA, NORTHEASTERN BRAZIL HAZEL M. PRICHARD§ Department of Earth Sciences...Universidade Federal da Bahia, 40.170-290 Salvador, Bahia, Brazil PETER C. FISHER Department of Earth Sciences,...Wales, U.K. ABSTRACT In the Bacuri complex, Amapa, Brazil, there is good evidence for Pd mobility both during...platinum-group minerals. They commonly occur with pentlandite and (less common) pyrrhotite, typically partially...lateritization, serpentinization, Bacuri complex, Amapa, Brazil. SOMMAIRE Le complexe igné de Bacuri, dans l’état |  | Maier, W.D., Smithies, R.H., Spaggiari, C.V., Barnes, S.J., Kirkland, C.L., Yang, S., Lahaye, Y., Kiddie, O., MacRae, C. (2016) Petrogenesis and Ni–Cu sulphide potential of mafic–ultramafic rocks in the Mesoproterozoic Fraser Zone within the Albany–Fraser Orogen, Western Australia. Precambrian Research, 281. 27-46 doi:10.1016/j.precamres.2016.05.004 | Journal (article/letter/editorial) | | Perth, Australia Keywords: Albany Fraser Orogen, Nova Ni-Cu deposit, magmatic sulphides, basalt ____...platinum-group elements (PGE, <1 ppb). Levels of high field-strength elements (HFSE) in the least enriched rocks...for Ni-Cu sulphides following the discovery of the Nova deposit in 2012 in an intrusion consisting of olivine...metagabbroic sills, at R factors of ~1500. However, the Nova rocks tend to have higher εSr (38-52) and more variable...domains of Western Australia. The discovery of the Nova Ni-Cu sulphide deposit within the distinct, orogen-parallel |  | Barnes, Stephen J., Taranovic, Valentina, Miller, John M., Boyce, Glenn, Beresford, Steve (2020) Sulfide Emplacement and Migration in the Nova-Bollinger Ni-Cu-Co Deposit, Albany-Fraser Orogen, Western Australia. Economic Geology, 115 (8). 1749-1776 doi:10.5382/econgeo.4758 | Journal (article/letter/editorial) | | 1749–1776 Sulfide Emplacement and Migration in the Nova-Bollinger Ni-Cu-Co Deposit, Albany-Fraser Orogen...Western Australia 6151, Australia Abstract The Nova-Bollinger Ni-Cu sulfide deposit is associated with...displaced silicate partial melt. Coarse-grained pentlandite-chalcopyrite-pyrrhotite loop textures are characteristic...fractionation and growth of high-temperature pentlandite by peritectic reaction between fractionated sulfide...solution. The highly distinctive features of the Nova-Bollinger ores are a consequence of their emplacement |  | Barnes, Stephen J., Taranovic, Valentina, Schoneveld, Louise E., Mansur, Eduardo T., Le Vaillant, Margaux, Dare, Sarah, Staude, Sebastian, Evans, Noreen J., Blanks, Daryl (2020) The Occurrence and Origin of Pentlandite-Chalcopyrite-Pyrrhotite Loop Textures in Magmatic Ni-Cu Sulfide Ores. Economic Geology, 115 (8). 1777-1798 doi:10.5382/econgeo.4757 | Journal (article/letter/editorial) | | pp. 1777–1798 The Occurrence and Origin of Pentlandite-Chalcopyrite-Pyrrhotite Loop Textures in Magmatic... University of Leicester, England Abstract Pentlandite is the dominant Ni-hosting ore mineral in most...process gives rise to the development of loops of pentlandite surrounding pyrrhotite grains. Recently it has...has been recognized that not all pentlandite forms by exsolution. Some may form as the result of peritectic...microbeam X-ray fluorescence mapping to image pentlandite-pyrrhotite-chalcopyrite intergrowths from a range |  | | Report (issue) | | at relatively high temperature, in pyrrhotite–pentlandite ores in which it commonly occurs as intimate...Association: Chalcopyrite, pyrite, pyrrhotite, pentlandite, sphalerite. Distribution: Numerous localities;...Christmas mine, Gila Co., Arizona; from Prince William Sound, Alaska. In the Strathcona mine, Sudbury...Traversella, Piedmont, Italy. In Brazil, in the Morro Velho gold mine, Nova Lima, Minas Gerais. At Broken |  | | Journal (article/letter/editorial) | | Oliveira Fortes Gold deposits and occurrences of the CrixaÂs Gold®eld, central Brazil Received: 14 November...2001 Ó Springer-Verlag 2001 Abstract The CrixaÂs Gold®eld is a part of the Tocantins province and consists...2.9 Ga Archean granite±greenstone terrane. The gold ®eld contains one large deposit (Mina III, 65 tons...formations, auriferous quartz veins, and disseminated gold ores in carbonaceous schists. On a more local scale...tectonic events. Introduction Gold production in the state of GoiaÂs, central Brazil, began in the 18th century |  | | Book | | rock photographs; Donna Naughton took a nun1ber of field photographs and prepared the Geological Regions...Mineral or Rock? Origins of Minerals and Rocks Field Equipment Where to Collect I..:Come Equipment Cataloguing...looked at as a continuous cycle. Field Equipment Keep yoLu- field equipn1ent sirnple but of high quality...quality. Below I have laid out what T cany into the field for n1ineral col lecting. The tools will be found...what you collected if you can identify it in the field. The locality infonnation is the 1nost in1portant |  | | Journal (article/letter/editorial) | | developed cubanite crystals from the Henderson No. 2 mine in the Chibougamau mining district, Quebec, Canada...canogenic, massive sulfide deposits and pyrrhotite-pentlandite Cu-Ni ores in which it commonly occurs as oriented...Swift mines, Padding County, and the Villa Rica mine, Douglas County, Georgia. It has been reported as...United States. These include ores of the Republic mine, Fierro district, New Mexico; the Christmas and...Butte, Montana; and the Daulton mine, Madera County, and the Walker mine, Plumas County, California. It |  | Milesi, J.P, Ledru, P, Marcoux, E, Mougeot, R, Johan, V, Lerouge, C, Sabaté, P, Bailly, L, Respaut, J.P, Skipwith, P (2002) The Jacobina Paleoproterozoic gold-bearing conglomerates, Bahia, Brazil: a “hydrothermal shear-reservoir” model. Ore Geology Reviews, 19 (1) 95-136 doi:10.1016/s0169-1368(01)00038-5 | Journal (article/letter/editorial) | | The Jacobina Paleoproterozoic gold-bearing conglomerates, Bahia, Brazil: a ‘‘hydrothermal shear-reservoir’’...widespread alteration with gold-bearing quartz lodes, conglomerates showing a sulphide – gold – Cr – mineral association... Such a model, which implies the existence of a gold preconcentration within the quartz – pebble conglomerates...magnetite and responsible for the high concentration of gold within shear veins containing assemblages of Cr...of the Paleoproterozoic, the sulphidation of the gold-bearing conglomerates would depend largely on the |  | | Journal (article/letter/editorial) | | familiar with iron sulfide-it is pyrite, FeS,, fool’s gold, brassy cubes, right? Well, the story of iron sulfides...alloy of copper and zinc, used especially to imitate gold in cheap Jewelry; it was named after Christopher...grains of such minerals as chalcopyrite and pentlandite. Pseudomorphs of marcasite, chalcopyrite, pyrite...pyrrhotite crystal on quartz attributed to the Potosi mine, Santo Domingo, Santa Eulalia (now known as Aquiies...crystal from the Morro Velho gold mine, Nova Lima, Minas Gerais, Brazil. The 10.1-cm specimen is in the |  | | Journal (article/letter/editorial) | | Proterozoic Gold Placersof the Moeda Formation within the GandarelaSyncline,Minas Gerais,Brazil W. E. L....SIEGERS Minas Novas Ltda., Belo Horizonte, Brazil Abstract Gold-bearingplacerconglomerates, datedbetween2...Witwatersrandplacersasdoesthe compositionof the gold. Gold concentrations are equalto thoseof the avera...unconformablyoverliesde- pricesabovethe world market gold price. Officially formedArchcanstrata.It isburiedbeneathSuperior-...progressivelymore of the hitherto unofficiallyproMinas Gerais,Brazil (Fig. 1). This area, extending ducedgoldwasbought |  | | Journal (issue) | | in in the the Okkampitiya Okkampitiya gem gem field, field, Sri Sri Lanka Lanka 1 1 2 V. V.Mathavan Mathavan...in inthe theOkkampitiya Okkampitiya gem gem field field which which isissituated situated in in south-eastern...from the the Okkampitiya Okkampitiya gem gem field field are are described. described. These These are...Ratnapura field, the Elahera field, the Bibile field, the Kataragama field and the Okkampitiya field (see...(see Figure 1). The Ratnapura field includes the famous gem-producing areas near Ratnapura, Pelmadulla, Embilipitiya |  | | Journal (article/letter/editorial) | | mentioned that I chose geology because I preferred field work to laboratory classes,but it turns out that...touch with the realities of field occurrences.By using rocks whose field significanceis thoroughly known...known, I hope to keep in contact with the field geologywhich must continue to be the sourceof inspiration...the way for the vast amount of later work in this field. In his analytical work he strove for perfectionand...the Sudbury nickel ores. He spent many summers on field investigations in 564 MEMORIALS the Canadian |  | | Report (issue) | | 57 38.53 Total 100.00 99.93 100.10 (1) Homestake mine, Lead, Lawrence Co., South Dakota, USA; corresponds...Association: Pyrite, marcasite, chalcopyrite, pentlandite, many other sulfides, magnetite, calcite, dolomite...(Nagybánya) district, Romania. From the Stari Trg mine, Trepča, Serbia. In Val Passiria, Trentino-Alto...crystals from the Morro Velho gold mine, Nova Lima, Minas Gerais, Brazil. At the Potosı́ and San Antonio...Santa Eulalia, Chihuahua, Mexico. From the Bluebell mine, Riondel, British Columbia, Canada. Name: From |  | | Journal (article/letter/editorial) | | Thailand; cinnabar, Germany; Artacie haemoptera, Brazil; Markus Klein and Robert Jakob specimens, Peter...photos. September/October: Silver crystals, Bachelor mine, Amethyst vein system, Mineral County, Colorado;...32; Nunavut, 31 Amethyst, British Columbia, 39; Nova Scotia, 39; Ontario, 38; Turkey, 127–28 Anatase...Colorado, 413; Nevada, 515 Annabergite, Kilometer 3 Mine, Laurium District, Greece, R. B. Cook, 154–59 Apatite...nomenclature, 204–5 Volume 85 Aquamarine, British, 29; Nova Scotia, 31; Ontario, 30; Yukon, 30 Aragonite: Mistaken |  | | Book | | specimen of gold on the back caver is approximately 5 cm taii and is from the Eagle's Nest mine, Piacer County...simple aUas of ore minerals that would serve as a field reference guide for working geologists and students...the atlas along in its early stages. Holly Keyes, field assistant at Simon Fraser, contributed some knowledge.... • , . ...... . .... . ......... . .. . •. Pentlandite . . . . . . . . . . . . . .••. . . . .. •. .... 34 Diamond .. , , •. . .. • . .. . ... .40 Gold ....................... • ...... - · .• • .... |
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