 | | Journal (article/letter/editorial) | | 138 carats, from the Democratic Republic of the Congo was examined by GIA labs (King and Wang 2013). The...framesite with finely dispersed inclusions of magnetite is called stewardite. Another type of polycrystalline...Democratic Republic of the Congo (formerly Zaire, formerly Belgian Congo) accounts for a large percentage...of this is from the alluvial deposits from the Tshikapa (or Kasai) area, along the Kasai River, discovered...300 kilometers east of Tshikapa at the Mbuji-Mayi (or Miba) deposit in Kasaï-Oriental Province (Levinson |  | | Journal (issue) | | in minerals. V Q( er IO nc pl SU m Ste wl dr th N, w _,..,,..,w..,...,,..,,..,...............invertebrate fossils of Permian age. Quartz, magnetite, and garnet sand are found in a more or less intimate...extensively as a scouring and cleans>f ing powder. es Dr. E. H . Barbour has described this IS volcanic ash...county f ulgurites have been described in detail by Dr. E. H. Barbour of the Nebraska State Museum and A...Sioux County, Nebraska. They were first collected by Dr. E. H . Barbour and described by him in the Proceedings |  | | Book | | Missing Label and a Wooden Box The Deposits of the Tshikapa Region The Mbuji-Mayi Deposits The Future J....“dark gray diamond” may well have been magnetite. Magnetite, a natural, magnetic iron oxide, has...Its gray color is similar to that of a sword. Magnetite is found abundantly in India, a country particularly...husband and wife who had quarreled.) Because magnetite was for hundreds of years considered to be equivalent...November, 1926, in Namaqua- land. A German geologist, Dr. Hans Merensky, identified alluvial deposits on the |  | | Journal (article/letter/editorial) | | Africa" extendingfrotn CapeProvincebeyondthe northern Congo includesthe continent'sprincipal iron, manganese...to the Sudan. "High Africa" (I) rises betweenthe Congo,Angola, and Kalaharibasins--andthe East-Africanfolds...Merensky"Reef"andthe lategabbros.Vanadiferous-magnetite hasbeendisseminated in pegmatitic anorthosites...north-east (Stanleyvillearea), (b) southwest(Lower Congo) and (c) south-east (Katanga).It is distinguished...from Nambala,to M'utuntuand Musombwishi, alongthe Congo/ Rhodesianborder,west of Elisabethville(37). A |  | | Journal (issue) | | MILFREEPUB Director, Continental European Operations Dr. Walter F. Vogeno STAFF CORRESPONDENTS: Africa—Johannesburg...Wherever these copper ores are processed—in Belgian Congo—you’ll «+The machines crushing practice... wide...by Diamang in Angola, Forminiére at Tshikapa and Bakwanga, Congo Republic, by CAST in Ghana, SLST in...Africa, at Williamson in Tanganyika, and Bakwanga, Congo Republic is first transported to a central concentrating...Forestiére Miniére du Congo (et al) Companhia de Diamantes Sierra Leone Dig Tshikapa, de Angola Trust |  | | Report (issue) | | Switzerland • •• U.S.S.R. (Russia) Angola Belgian ••• Congo • • • • -.. • •• ••• •• • • •• • •• •...refractometer with a fixed scale, such as that devised by Dr. Herbert Smith, or one of the modern improved forms...the alluvial fields of Angola. a.n d the Be1lgian Congo. The syndicate made a cont1~act with the prodt1ce1·s...production of low-grarde stones in the Belgian Congo, the Gold Coast and other alluvial fields in Africa...J11alachite.-R.ussia, Rhodesia, United States, Belgian Congo. " • - 19661 B 2 80 : .World's Production |  | | Report (issue) | | is proportional to the square of the relative magnetite content in the material. V. 8. 11025. Kalinin...pp. 549-556, 1948. - .. .. . The effects of magnetite concentration and grain size on the magnetic properties...interpretation of magnetic data. Seven samples varying in magnetite content were compressed from mixtures consisting...weights of. river sand, bakelite, and powdered magnetite from the Gora Vysokaya deposits, in the Nizhniy...Four other samples were prepared from powdered magnetite grain sizes , and bakelite. Gypsum was substituted |  | | Catalog/List | | Signed Client# (if known) Mr. Mrs. Ms. Dr. Bidder# name Address city STATE... It was probably collected in the 1870s-1880s by Dr. George A. Koenig when he visited the mines. He later...#D1746] Estimate: $4,000-$5,000 52029 CUBIC MAGNETITE Fowler Ore Body, ZCA No. 4 Mine, Balmat, Balmat-Edwards...District, St. Lawrence Co., New York, USA Good Magnetite specimens are remarkably difficult to find in...are crawling with the stuff. Even more rare are Magnetite specimens of the cubic crystal form - the best |  | | Corporate Document | | AND NAMOYA CONCESSIONS, DEMOCRATIC REPUBLIC OF CONGO Prepared for: Banro Corporation Prepared by:...Figure 1.2: Location within Democratic Republic of Congo ..................................................Maniema provinces of the Democratic Republic of Congo (DRC) since 1995. Political unrest and legal title...AND NAMOYA CONCESSIONS, DEMOCRATIC REPUBLIC OF CONGO 1 INTRODUCTION 1.1 Terms of Reference Steffen...Exploitation Permits in the Democratic Republic of Congo (DRC). Steffen, Robertson and Kirsten (UK) Ltd |  | | Report (issue) | | 27 Chad . . . . . . . . . . . . . . . . . . . 31 Congo . . . . . . . . . . . . . . . . . . 33 Cote d'Ivoire...Heydari is a mining engineer and mineral economist. Dr. Heydari has worked in California, Colorado, and...petroleum and diamonds in Angola, petroleum in the Congo and Nigeria, gold in Ghana, bauxite in Guinea, uranium...'32 82 620 10 Central African Republic 414 Congo 115 Cote d' lvoire 510 178 17,000 5 15 (2)...million carats, was smuggled out of the country into Congo via Zaire. Crude oil exports accounted for approximately |  | | Book (edition) | | This book is respectfully dedicated to the memory of Dr. John Sinkankas for his kind initiative and support...by Strunz (1996). Thanks to the kind permission of Dr. E. Nagele from the E. Schweizerbart'sche Verlagsbuchhandlung...arisen with localities in Congo-Zaire: the country, named Democratic Republic of Congo since 1960, was changed...There is also a country called Republic of Congo or simply Congo (capital Brazzaville). Information about...With anthophyllite, talc, chromean spine!, and magnetite in desilicified pegmatites, mainly at the exocontact |  | | Book (edition) | | R. Webster of the London Gemmological Laboratory; Dr. E. Giibelin, of Lucerne; Mr. R. Liddicoat, Director...Industrial Diamond Review; Dr. J. B. Hawthorne, Chief Geologist, De Beers, Kimberley; Dr. J W. Harris, Grant...University of Edinburgh; Dr. D. Elwell, Stanford University, California, U.S.A.; Dr. Robert Gaal, Gemological...Consolidated Mines, Dr. Judith Mi£lledge, Dept. of Crystallography, University of London; Dr. Godehard Lenzen...the first to the third century B.c. according to Dr. Godehard Lenzen. The Hope diamond, to which stories |  | | Book | | HongKong Barcelona Budapest Professor Dr. A. B. KAMPUNZU Professor Dr. R. T. LUBALA Laboratoire de Petrologie...thank Springer-Verlag, the publishers, especially Dr. W. ENGEL (Geosciences Editorial) for the prompt...continental trough on the southern borders of the Congo and Thnzania cratons, though comparable in size...zones bordering respectively south and north the Congo craton (Fig. 1) has been recently compared (Popoff...between the West-African and the Sao Francisco-Congo cratons. Ultimately, as a rough estimate, three |  | | Book | | commercially Chromite, native platinum, some magnetite and ilmenite; d iamond; corundum Lithium-bearing...source of so m e important iron ore, chiefly magnetite. The deposits of ch romite and platinum me tals...io n of certain deposits, however, such as the magnetite deposits in the Kiruna area, Sweden, showed th...aterial. The idea was then proposed that the magnetite, after accumulation as a segregation of crystals...however, because the heat required to melt the magnetite seemed unlikely to h ave been avai lable a nd |  | | Journal (issue) | | MILFREEPUB. Director, Continental European Operations: Dr. UNITED KINGDOM office: 130 Crawford Street, Walter...many times as much lowgrade ore. In the Belgian Congo, to the north, the Union Miniére du Haut Katanga...mixture of cherty specular hematite and sericite. magnetite with minor martite and Pelletizing: Reground...known research scientists, A. M. (Tony) Gaudin, Dr. Luigi Usoni, being celebrated. W. B. Kramer, an... Speakers are SPECIALIZED SUBJECT speakers were Dr. P. O. Yingst, Colorado School of Mines Research |  | | Journal (issue) | | FREEPUB Director. Continental F uropean Operations Dr. MILFREEPUB Charles Publish L. Shaw Street Manager...MINING WIDE FOR Algeria etaaie Congo Republic Republic of the Congo Ghana Kenya Morocco M-zembique Nigeria...Construction Company commenced production from the magnetite body on the Bruce property near Gilmore, Idaho...Missouri. Zontelli Brothers continued to drill a magnetite ore body near Potlatch, Idaho. The Anaconda Company...bypass line, (b) the water addition, and c) the magnetite addition. A controlling recording-ammeter measures |  | | Book (edition) | | 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 |  | | Book | | bedroom and handed me my mail order copy of Professor Dr. Edward J. G0belin's new book 'Internal World of...From a gemological stand point, one word describes Dr. G0belin. That word is Inspirational. Micromlamellar...as it now exists, would not have been possible. To Dr. Byron C. and JoAnn Butler. This book would not have...remember the 'tuna tower,' long gone but not forgotten. Dr. Nikolai Sobolev. Through your research and publications...gemology, and a curiosity of its many mysteries. To Dr. Frederick H. Pough. I grew up on your teachings |  | | Book (edition) | | pointed out errors of omissions in the first edition. Dr Kurt Nassau has been most helpful in advising on...based mainly on his information. My thanks go to Dr W E Smith of Chelsea College of Science and Technology...minerals which forms the first part of the book. Dr W Stern advised on the part dealing with the marketing...kindly prepared for me by Mr G A White of Norwich. Dr E Gübelin allowed the use of some of his excellent...appropriate here to mention that Plates I–XVI appeared in Dr E Gübelin’s Edelsteine, and are reproduced by courtesy |  | | Journal (volume) | | adventurers as in the early days, with examples from the Congo and the great Northern Territory of Australia. ...of The Leopoldville. junction the of of Tshikapa, village the Lovua river at with the Kasai...munition difficulties created by the war, and we are Tshikapa, escorted by Lieutenant Heide, with 50 soldiers...Societe Internationale Forestiere et Miniere du Congo, company tal is interested. office at in Travelling...Heide routed their forces, and the expedition pro- Congo State to investigated by this expedition hopes |  | | Journal (issue) | | nda nce as ar enopyrite, pyrite, pyrrhotite, magnetite, hematite, chalcopyrite, galena, sphalerite and...dec orative p u rposes. Lincoln ( 1 927) notes that Dr. W. P. Jenney brought back specimens on his return...MATRIX • 1 33 letavivianire was first found by Dr. David H. Garske of the South Dakota School of Mines...end and tapered to 1 9 i nch es at the oth er end. Dr. Fran k L. Hess of th e Rare M.inerals Division of...Fisher, on assig n men t by t h e State Ge ologist, Dr. E. P. Roth rock , i n 1 942 FALL 2002 was the |  | | Book (volume) | | based mainly on his information. My thanks go to Dr. W. E. Smith of Chelsea College of Science and Technology...minerals which forms the first part of the book. Dr. W. Stern advised on the part dealing with the marketing...kindly prepared for me by Mr. G. A. White of Norwich. Dr. E. Gibelin allowed the use of some of his excellent...appropriate here to mention that Plates I-X VI appeared in Dr. KE. Giibelin’s Edelsteine, and are reproduced by...pearl surface photomicrograph specially for me, and Dr. EK. H. Rutland, Mr. B. W. Anderson, Mr. R. K. Mitchell |  | | Book | | minerals of the late magmatic stage - apatite with magnetite or nepheline - crystallized from alcalic rest...vicinity of the parent magma (e.g. apatite + magnetite - Kiruna in Sweden, apatite + nepheline - Khibiny...Kola Peninsula in the U.S.S.R.). The apatite-magnetite and apatite-nepheline deposits are associated...magma of the early géosynclinal stage (apatite + magnetite - the Lebyazhensk deposit,the Ural Mts·,U.S.S...Si 6 0 1 Q helvite Mn 8 (BeSi0 4 )S 2 garnet-magnetite or pyroxene-garnet-scheelite, skarn danalite |  | | Journal (issue) | | Ideas.” WE DEDICATE this special Proceedings issue to Dr. Vince Manson, whose heart and considerable intellect... Harlow, Ed., The Nature of Diamonds, Dr. T. Anthony and Dr. J. Casey The General Electric Company ...diamonds. Acknowledgments: The authors thank Dr. Thomas Anthony and Dr. John Casey of GE Corporate Research &...dikes; St–star fissure; T–Tortiya alluvials; Ts–Tshikapa alluvials; V–Venetia pipe; Vo–Vaal/Orange Rivers...estimated to be: Botswana 26 Mct, South Africa 14 Mct, DR Congo 14 Mct, Angola 5 Mct, Namibia 2 Mct, rest of Africa |  | | Book | | crystals is called birefringence or double refraction (DR). Polarized light Light passing through an anisotropic... subtracting the lower from the upper to get the DR. The intermediate value, /?, then corresponds to...crypto-crystalline types of quartz such as onyx show a DR of about 0.006. This does not alter as the stone...(which quartz is anyway, of course) but with a lower DR than a single crystal of the same material would...hardness SG = specific gravity RI = refractive index DR = double refraction The letters (ft)) and (e) signify |
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