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| for Mbuji-Mayi and Kundelungu garnet and clinopyroxene megacrysts (Democratic Republic of Congo) M. Pivin...Megacryst Kimberlite Mbuji-Mayi Kundelungu Mantle Metasomatism a b s t r a c t Mbuji-Mayi (east Kasai province)...Republic of Congo (DRC). Mbuji-Mayi intrudes the Archean basement (Congo– Kasai Craton) and is diamond-rich...Paleoproterozoic basement (Bangweulu block) and is diamond-poor. The megacryst suites (or discrete nodule...geochemical differences between the garnets from Mbuji-Mayi and from Kundelungu. Polymineral inclusions composed |
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| Institution Washington, DC 20013 pohwatp@si.edu DIAMOND Dutoitspan Mine, Kimberley Northern Cape Province, South...barefooted traveler. Gardner F. Williams in The Diamond Mines of South Africa (1904, p. 115) T he valley...diamonds. As a child, this tale was a favorite of mine, especially as I imagined the birds to be pteranodons...Ralston (of Comstock Lode fame) was excited by a new diamond find somewhere in “a remote section of the United...were close-mouthed about the location of this diamond find but eventually agreed to conduct two people |
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| kyanite-bearing clinopyroxenite xenolith from Mbuji-Mayi kimberlite (DRC) MARJORIE PIVIN*, JULIEN BERGER...in the diamondiferous Mbuji-Mayi kimberlite province, Democratic Republic of Congo (DRC). Chromium contents...typical grospydites, no garnet is observed in the Mbuji-Mayi Cr-rich kyanite-bearing clinopyroxenite. The...eclogites, which are the predominant xenoliths in the Mbuji-Mayi kimberlites. The calculated whole-rock composition...Key-words: kyanite clinopyroxenite, chromium-rich, Mbuji-Mayi, kimberlite, xenolith, Kasai-Lomami Complex, |
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| mantle structure and the diamond potential of kimberlites in southern D.R. Congo J.M. Batumike a,b,⁎, W...1825, Lubumbashi, The Democratic Republic of the Congo a r t i c l e i n f o Article history: Received...Peridotitic garnets Congo kimberlites Congo lithosphere Diamond potential Mantle metasomatism Congo-Kasai Craton...peridotitic garnet xenocrysts from kimberlites in the Mbuji Mayi and Kundelungu areas and from heavy-mineral concentrates...concentrates collected in the Luebo area, D.R. Congo, have been analysed for major- and trace-element |
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| 00 More than 420 full-color illustrations The diamond occupies a unique position in the history of the...prospectors, min- eralogists, gemologists, engineers, diamond cutters, jewelers—are men who have earned the respect... and Kimberley. The second section, THE ROUGH DIAMOND AND ITS ORIGINS, takes the reader to the actual...and pleasure. The 130.27-carat Light of Peace diamond, shown on the front cover, was cut from a 434.6-carat...Sierra Leone. The Light of Peace is the largest diamond in the United States and one of the thirty-five |
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| Rhodonite, 4.7 cm, from the 1700 level, Zinc Corporation mine, Broken Hill, New South Wales, Australia. Collection...collection, John Chapman photo. • 2.5 cm, Top Camp mine, Western Ausytralia. George Stacey collection, Jeff...Scovil photo. Middle row from left: • 2.3 cm, Kintore mine, Coolgardie, Western Australia. Aloe Family collection;...spent three months working in the newly discovered diamond fields around Kimberley, South Africa. His numerous...spent the rest of their lives there as miners and mine captains. Cornish tradition favored the collecting |
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| scientists and industrial personnel concerned with diamond exploration and exploitation, petrology, geochemistry...the primary diamond host rocks and their entrained xenoliths and xenocrysts (including diamond) to get together...organizations, academic institutions and Indian diamond mining companies. About 300 delegates from 36 countries...lithospheric mantle magmas, diamond exploration, cratonic roots, diamonds, diamond mining and sustainable...governance of diamond exploration. Pre- and post-conference field trips were organized to (i) the diamond bearing |
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| THE DIAMOND WORLD By the same author THE MELLONS JOSEPH P. KENNEDY THE DIAMOND WORLD DAVID... London, Mexico City, Sao Paulo, Sydney the diamond world. Copyright © 1981 by David E. Koskoff...., 1939- The diamond world. Includes bibliographical references and index. 1. Diamond industry and...1 CONTENTS Introduction: The Diamond World PART I THE DIAMOND PRODUCERS 1 2 3 4 5 6 7 8 Maharajas...Kuwait of the Diamond World Robbers and Cops Harry Oppenheimer: South African "Radical" Diamond Diggers 9 |
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| HongKong Barcelona Budapest Professor Dr. A. B. KAMPUNZU Professor Dr. R. T. LUBALA Laboratoire de Petrologie...especially those supplying the largest worldwide diamond production in South Africa and ZaireAngola. Their...thank Springer-Verlag, the publishers, especially Dr. W. ENGEL (Geosciences Editorial) for the prompt...Their Mineral Inclusions ................. 5.1 Diamond Characteristics .......................... 5.2................................. Kimberlite and Diamond Indicator Minerals .............. Synthesis .. |
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| 1947-1996 FEATURE ARTICLES 2 A Hi story of Diamond Sources in Africa: Part II A. f. A. (Bram) lanse...is survived by h is daughter Loressa, his parents Dr. and Mrs. Erw in Kemmerling, and a brother and a...HISTORY OF DIAMOND SOURCES IN AFRICA: PART II ByA. ). A. (Bram) [anse Following the history of diamond di scovenes...Parr J, this article discusses the his tory of diamond exploration and min ing in East and West A frica...developments and new diamond occurrences in A frica led to many of the key concept s in modem diamond geology. Although |
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| 978-0-8214-4482-5 (pdf) 1. Diamond mines and mining—Africa—History. 2. Diamond industry and trade— Africa—History...Africa—History. 3. Diamond industry and trade—Social aspects—Africa. 4. Diamond mines and mining—Economic...Illusion to Reality The Kimberley Discoveries, the Diamond “Rush, ” and the “ Wild West” in Africa four ...c. 1375 27 2 Elmina Castle 33 3 Kimberley Mine, 1872, showing an end view of the excavations 47...began to delve into Zimbabwe’s rapidly shifting diamond mining landscape. Chadia Chambers-Samadi, John |
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| 11(7-8), 08 .8 6 11-13 Zaire : diamond digcers invited t o leave the MIBA cor.cession . Temanummer Freiborg...dolla miniara di Non tevecchio nella Sardegna Sud-Oriental e 32-40 Localita paleontologiche e minera logiche...Cameronite, a ncw Cu-Ag tellurid e from the Good Hope mine . Vulcan, Cn (USA ) 385-397 Compositional trends...the National Bell e mine (CO, USA ) 237-254 Phosphate m .inerals from the Tip Top mine, Black Hi11s, S ...localit y (CO, USA ) 261-268 The Suca della Vena mine (Toscane , 1) 269-274 Micromineral s * Lapis 11(6) |
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| SUMMER 2007 SUMMER 2007 PAGES 95–196 Global Rough Diamond Production VOLUME 43 NO. 2 Durability Testing..._____________ FEATURE ARTICLES _____________ Global Rough Diamond Production since 1870 A. J. A. (Bram) Janse Reports...weight and value) for the world’s most significant diamond sources, through 2005. 120 Durability Testing..._ 153 Lab Notes Diamond with bimineralic inclusions • HPHT-treated type Ia diamond with a green component...defect • Diamond with intense “rainbow graining” • Natural color hydrogen-rich blue-gray diamond • Type |
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| Diamond Geology Published on www.debeersgroup.com Index A) Classification and genetic models B) Exploration...Treatment D) World Production E) South African Diamond Occurrences 1. Large Kimberlite Mines 1.1 Venetia...Terms Diamond Geology Page 2 www.debeersgroup.com A) CLASSIFICATION AND GENETIC MODELS Diamond deposits...Premier mine. The proportion of gems in the West Coast marine deposits is over 98%. The MIBA mine in the...the Congo and the Argyle mine in Australia have an average gem content of only 5%. The dispersal of diamonds |
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| material; Shane McClure, Robert Crowningshield, and Dr. George Rossman for useful suggestions; John Koivula...short-wave U.V. transparency tests and supplying figure 5; Dr. Anthony R. Kampf tor providing the crystal morphology...preparing figure 2; and George Bosshart, Dr. H. A. Hanni, Dr. W. B. Stern, and B. Suhner for the spectrophotometric...following morphology descriptions were prepared by Dr. Anthony R. Kampf, curator of mineralogy at the Los...bohedral Ramaura synthetic ruby crystal. Drawing b y Dr. A n t h o n y R. Kampf. nificantly greater thickness |
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| EDITORIAL _____________ 201 Shifting Tides in the Diamond Industry William E. Boyajian FEATURE ARTICLES...Political and Economic Forces Shaping Today’s Diamond Industry Russell Shor Chronicles the key developments...events that have radically transformed the global diamond industry in recent years. 234 pg. 222 Experimental...alexandrite with needles and crystals • Dyed rough diamond • Strongly colored natural type IIb blue diamonds...the publisher. Since the late 1980s, the world diamond market has undergone enormous changes at every |
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| about diamonds trip readily off the tongue. A diamond may be ‘forever’ and ‘a girl’s best friend’, but...but the truth about the international diamond business is not so romantic. Timothy Green has travelled... salesmen and smugglers not only in the main diamond centres of London, New York, Antwerp, Tel Aviv...to replace South Africa as the world’s champion diamond producer by 1985. It is also a business in which...most illustrious diamond salon; Lazare Kaplan, who studied the famous Jonker diamond for a whole year |
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| five small frogs caved of aquamarine with inset diamond eyes, upon a wave motif, set amidst rushes and...WORKS OF ART, GEMSTONES AND MINERALS | 7 2012 DIAMOND-SET BEE BROOCH AND FROG EARRINGS BY ANDREAS VON...green suede pouch stamped Zadora. 2013 ENAMEL, DIAMOND AND RUBY FROG BROOCH Attributed to Andreas von... length 1 in. $600 - 800 2011 (detail) 2014 DIAMOND-SET YELLOW GOLD BROOCH BY ANDREAS ZADORA-GERLOF...000 - 1,500 2011 GREEN BERYL FROG BROOCH WITH DIAMOND EYES BY ANDREAS VON ZADORA-GERLOF By Andreas Zadora-Gerloff |
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| 27 Chad . . . . . . . . . . . . . . . . . . . 31 Congo . . . . . . . . . . . . . . . . . . 33 Cote d'Ivoire...of diversified experience in mineral exploration, mine design, development, and operations, as well as...Heydari is a mining engineer and mineral economist. Dr. Heydari has worked in California, Colorado, and...ranked by portion of world production in 1993, were diamond, cobalt, chromite, gold, phosphate rock, manganese...and zircon. Several of these-chromite, cobalt, diamond, and manganese- were not produced in the United |
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| __________________ 166 An Era of Sweeping Change in Diamond and Colored Stone Production and Markets Russell...Dirlam A summary of the decade’s most important diamond, colored stone, and pearl sources. Includes a wall...decade of the 2000s saw dramatic changes in the diamond and colored stone industries, as established conventions...moving products from mine to consumer. The main cover image was taken at the AnahÌ mine in Bolivia, a major...The gems in the foreground are: (1) a 1.01 ct diamond, GIA Collection no. 37583 (2) a 4.50 ct emerald |
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| as well as a contemporary yellow and “white” diamond necklace set in the decade’s most prominent jewelry...ironically, it closed with another threat to the diamond industry: that of “unidentifiable” high pressure/high...computer power and programming ability, cut in diamond became an important focus. Researchers were able...with innovations in communication. Top: GE POL diamond / Bottom: Synthetic diamonds T Editorial During...marketed, and merchandized. In diamonds especially, the mine-to-market process has been severely tested. Vertical |
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| marketing activities in Colombia, are discussed in Dr. Keller's article i n this issue. The Mogul emerald...the specific examples included. ABOUT THE AUTHOR Dr. Rossman is associate professor of mineralogy at...color in diamond and its response to radiation (Davies, 1977). Laboratory irradiation of diamond can be...example, irradiation of a light- to medium-yellow diamond with gamma rays can produce a green stone (figure...used to irra- 70 Color in Gems diate the same diamond, it might turn blue instead (figure 23). It has |
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| Coast. DIAMONDS: FROM BIRTH TO ETERNITY A diamond is rarely found embedded in kimberlite rock. This...update its diamond mining and reeovery inlormation, we asked the assistance ol John Roux, Diamond Information...to present Arthur Wilson’s compilation on the diamond and its origins. Richard T. Liddicoat, Jr. CONTENTS... 413 Index . 449 i\ LIST OF ILLUSTRATIONS Diamond (Color Plate).Frontispiece Lord Rutherford. 4 Radiometric...Radiometric dating. 5 Hannay's experiment. 11 Graphite-diamond equilibrium . 13 Convection cells . 15 Snider-Pelligrini |
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| Welbourn, Martin Cooper, and Paul Spear. The natural-diamond rings shown here contain round brilliants weighing...(right)6.78 ct with a 3.49 ct yellow emerald-cut diamond. Courtesy o f Hans D. Krieger, Idar-Obatstein,...need and desire for quick, easy, and reliable diamond testing in a fast-paced, competitive world. Thus...153 THE OBSERVATION OF MAGNETISM IN SYNTHETIC DIAMOND "A Chart for the Separation of Natural and Synthetic...in the Spring 1996 "Letters" section (p.63).Both Dr. Hanneman's original letter and the reply by GIA |
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| EQUATORIAL AFRICA 13 Middle Africa from Chad to Congo 279 14 Zai:re 311 PART FIVE EASTERN AFRICA 15...states of Nigeria 66. Economic map of Gabon and Congo 67. Economic map of Cameroon 68. Economic map of...Anglo-Egyptian Sudan Basutoland Bech uanaland Belgian Congo Congo (Kinshasa) Fernando Po a French Somaliland French...French Soudan b Gold Coast Madagascar Moyen Congo c Northern Rhodesia Nyasaland Portuguese Guinea Rio...of Afars and Issas Mali Ghana Malagasy Republic Congo (Brazzaville) Zambia Malawi Guinea (Bissau) Spanish |
Miba Mine, Mbuji-Mayi, Kasaï-Oriental, DR Congo