 | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | Book | | gemological wealth of East Africa. This unique region encompasses ·what may be the world's richest gem...gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical splendor...200 known here-holds the productive Mwadui diamond mine, known for Yeryfine, rare, pink diamonds. Emerald...chrome tourmaline are widely identified with the region. ( continuedon backflap) ♦ ♦ ♦ ♦ ♦ ~...~OSCIENCE 'l'RESS, INC. TbPattiFor sunrises over Lake Turkana, champagne in the Serengeti, and Norfolk |  | | Catalog/List | | it collected when the Tsumeb Mine (as well as other mines of the region) were still in production in...engineering work took him to the Tsumeb Mine in Namibia. This mine is renowned for producing what are arguably...MINERALS 57001 Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the Tsumeb Mine were |  | | Journal (issue) | | material for corundum, easy to do since chrysoberyl has a hardness of 8.5 (versus 9.0 for corundum). Seybert...simulated alexandrites, which can be spinel or corundum that has been treated. Most artificial alexandrites...from Russia’s Sverdlovsk Oblast (administrative region) in the Ural Mountains. Alexandrite was named in...have been found in Brazil, India, Madagascar, Tanzania, and Sri Lanka. deposits. Most cymophane is yellowish...specimen-producing discovery in 2017. At the Carnaiba Mine in Bahia, Brazil, the alexandrite variety of chrysoberyl |  | | Report (issue) | | been found in The four most promising aroas and Mine Fork of Jacks Creok, 1918, its mining possibi...of othor abrasive materials such as garnet and corundum, these moat considerable and cannot replace...investigated* These deposits were noted during the early corundum mining in Worth Caro lina, but wore considered...Yancey County; near Leicostor, Buncombe County; at Corundum Hill, Itecon County; and at Little Buck Creek...since 1887 in at Tho Ltirgost shipments (Ross Mine) amount to about 130 tons from of concentrate |  | | Journal (issue) | | electrolyte was produce a very vigorous oxidation of the corundum. The Fe22++ contained in the sapphire was partly...9°Clmin. Introduction corundum resources have Recently, large natural corundum been found in Shandong...by an originally colourless, heavily fractured corundum which is cut into beads for necklaces (Figure...necklace. The material was originally near-colourless corundum. Magnification 25x. more stable adhesion to the...its molten state. For the moment, diamond and corundum are the only gemstone species treated by this |  | | Journal (article/letter/editorial) | | creates a natural buffer to evaporation above the lake or sabkha. Salts more saline than halite are typically...leached in the drainage basin surrounding the salt lake (Eugster & Hardie 1978; Eugster 1980). Flow through...bicarbonate ions in the brackish inflow waters. If the lake waters are enriched in HCO3~ compared to Mg2+ and...mineralogies found in the lakes of the Salt Creek region, Coorong, South Australia (Warren 1990). Individual...example, the potash salt carnallite is a modern lake precipitate in Qaidam Basin, northern Qinghai-Xizang |  | | Journal (issue) | | wandered as far to the North as the Klamath River region (N. W. California to S. W. Oregon), seeking better...tion to the history of the early cul tures of the region. Wupatki, Wuka ki, Lumoki, Betatakin, Tsegi Can...the foot of the Mountains Misnenses, near unto the Lake of Alsacia, Stones are very commonly found that...hath overflown the whole Territory of the City of Magara, where only these sort of Stones are found. But...Chalcopyrite 12. Gypsum 18. Orthoclase 24. Talc 7. Corundum 13. 19. Pyrite 25. Tourmaline 39. 40. Copper |  | | Book | | Private Reports to ECA (5) V. KOVENKO - Balya Lead Mine-MTA Year Book-1940 (6) z. SANLAV - Private Correspondence...from Balya, and by others that operation of the mine began during the Age of Pericles. A t any rate,...I and the Greek invasion of the early 1920's the mine was operated until 1938 when high operating costs...and equipment were later moved to the Keban lead mine in Ela.zig. It is esti mated that from the end...ac companies dacite-liparite and appears in the region of big tectonic fractu res and cross-faulting |  | | Book | | ...................................... 263 4. Corundum-Ilmenite G ro u p ..............................prospect for mineral deposits. In places, ancient mine workings have survived to our time (Fig. 1). Of...Petersburg for further study. In 1763 he appealed to the mine owners asking them “ to supply specimens of various...and precision instruments. Diamond (carbonado), corundum, garnet, and quartz are used as polishing abrasives...Observing daily the behaviour of ores in mine workings, the mine geologist grasps better than anybody else |  | | Report (issue) | | must know not only in which direction a particular mine opening should be extended to continue in an ore...utilization of the manganese deposits in the Nikopol region, U.S.S.R., described in the chapter on "Manganese...changing as the advance of technology permits us to mine or process minerals that were once too low in grade...technologic advances will make it profitable to mine resources that would be much too costly to produce...are at least a few prematurely deserted mills and mine installations built on the expectation of finding |  | | Book | | weathering. Sedimentary deposits are enerated on sea, lake, river and marsh bottoms with formation of stratified...sediments of seas and oceans as well as in river or lake sediments and on valley slopes. U, Cu, native sulfur...granite, jasper, agate, rock crystal, garnet, corundum, diamond, etc.); e) hydromineral resources (underground...and geological structure are isolated in the ore region territory. Ore fields consist of ore deposits enclosing...are called native, while ores produced from river, lake, sea and ocean sands are called placer. Ore structure |  | | Journal (issue) | | enriched in chlorite around the intense veining. Lake Hawea, New Zealand. (d) Dolomitised Carboniferous...containing vein with galena and quartz. Nenthead mine, Cumbria England. (e) Example of heavily fractured...geology of Connemara, a remote, boggy and rain-swept region of the west coast of Ireland; (Ireland was described...to study the thermal evolution in the lithocap region of a shallow pluton, and asked if I was interested...equilibrium, and the field labeled V + NaCl is the PT region in which vapour and halite coexist. The dashed |  | | Report (issue) | | highest-lying diamond pipe. Commissioning Letseng mine at 10 500 feet during the last two years has called...Whatever you're mining, wherever you're mining, mine it on Bridgestones Bridgestones — for all the variables...Operating conditions differ enormously from mine to mine. Not only are there variations in the kind of...Whatever you’re mining, wherever you’re mining, mine it on Bridgestones. iaaseinn Money — BRIDGE STONE...Sweden 531 511 408 484 359 444 493 461 409 476 Tanzania Thailand Togo New Zealand Trinidad and Nicaragua |  | | Report (volume) | | biological and physical sciences of the Pacific region. University of Hawaii Press. Honolulu, Hawaii....Division of Water Rights Technical Publication. Salt Lake City, Utah. Utah Div. Water Resources Coop. lnv...Resources Cooperative Investigations Report. Salt Lake City, Utah. Utah Geol. and Mineralog. Survey Bull...Utah, College of Mines and Mineral Industries. Salt Lake City, Utah. Utah Geol. and Mineralog. Survey Circ...Utah, College of Mines and Mineral Industries. Salt Lake City, Utah. Utah Geol. and Mineralog. Survey Quart |  | | Book | | sabkhas.181 Contents Alluvial fan-ephemeral saline lake.] 81 Sabkha Yotvata, Israel.181 Basin and Range...field-ephemeral saline lake.201 Lake Eyre, Australia.202 Lake Frome, Australia.208 Lake Callabonna, Australia...210 Perennial stream floodplain-perennial saline lake.210 Eolian sabkhas. 211 Sea-margins with elongate...230 Coastal salinas of the Middle East.231 Solar Lake. Gulf of Elat.231 Ras Muhammad Pool, Southern Sinai...saline lakes.238 Great Salt Lake, Utah.239 Mono Lake, California.243 Lake levels and conditions.244 Tufa |  | | Book | | disseminating the information, the mine geologists and mine managers who have made the mine visits a rewarding experience...concentration required to achieve the break-even point for a mine in terms of revenue and costs. Any detailed exploration...province may be defined as a mineralized area or region containing mineral deposits of a specific type...constituents in a fluid medium from the source region to the site of deposition; and (c) localization... CHAPTER 2 Australian Classification Normative Corundum -I-type Granitoids-__,�.,.l•-S-type Granitoids--1 |  | | Book | | Whitie is a longtime fixture of New England and Lake Superior geology, but we will not deal here with...these two sources of energy is continuous in the region of steep thermal and chemical gradients near the...Wftwatersrand, and widespread chemical sedimentation of Lake Superior-type banded iron-formations, which reached...relatively short time span, but viewed as a whole [region] the metalli¬ zation was of long duration’ (p....base of the Complex (Vermaak, 1976). At the Atok mine, platinoid minerals tend to occur at the boundaries |  | | Journal (volume) | | IOWA 3 1858 045 060 781 | TE THE SALT LAKE G N I MIN REVIEW . ESTABLISHED APRIL11099 , ...March 30, 1915 The Salt Lake Mining Review 1601 Walker Bank Building SALT LAKE CITY , UTAH 2 620.05...Superior to Expand By Letson Safety and Economy in Mine Ventilation . The Prosperting Spirit . Editorial...Low Eagle & Blue Effects U. S Coal Company's Mine near Kemmerer, Wyoming. Votes of Chloridizing...Goodspring Notes Northwestern Notes A Rich Mining Region R. Development at Tonopah By C. 17 20 21 22 |  | | Book (edition) | | exposed in the Canadian Shield formed when the region underwent stretching over a billion years ago;...pressure in this magma chamber becomes great enough, magara is forced upward throngh a chimney, or Crack, to...lavapools ina Caldera formation (for example, Crater Lake, Oregon) subsurface, lens-shaped mass, called a...The uplift may also be Gue to the heating of the region when slabs of the underlying Hthospherk mune drop...2 THE NATURE OF GEOLOGY 3 ¢ Do you live in a region threatened by landslides, volcanoes, earthquakes |  | | Book | | deposits — an update. J. M. Franklin ... 49 Avoca mine, Co. Wicklow: a review of geological and isotopic...Crowe ... ... ... 331 Geology of the Abbeytown Mine, Co. Sligo, Ireland. M. W. Hitzman 341 The setting...exploration: a short review and an example from the Navan mine, Ireland. L. Fontbote and G. C. Amstutz 685 Forgotten...is also due to the mining companies who allowed mine visits before and after the Conference. Tara Mines...several group visits over three days, ably led by the mine geologists. Ennex (Silvermines). Magcobar (Ballynoe) |  | | Journal (volume) | | Ce ia p taeda S . . ne i E e oe a onae Lake of he Woods. [1lusSee it, «A.C. ee Ake tet es Oe...M.pr eee s eea Glacial Origin of Presque Isle, Lake Erie... 2... e Mythic Dry-paintings of the Ravot...LITERATURE. Merriam’s Mammals of the Adirondack region, 57; Gray’s Synoptical Flora,’60; Allen’s Human...786; ' South America: Roraima; The Saskat chew an region, The Xingu, 787: Europe, 788; Africa: H s ican...Marsh on Ši ; The Syncarida, a group of Carbonifi region the Dinocerata, a ews, 705; The Mammalia of |  | | Report (volume) | | of the r e s o u r c e , because blowouts i n t o mine openings from n a t u r a l d e c r e p i t a t...Olivine phenocryst from 1965 Makaopuhi basalt lava lake, Hawaii, USA, (collected at 1,135°C), containing...are at top and l e f t (C). Sample from H i l l mine, Cave-in-Rock, southern I l l i n o i s fluorite-Pb-Zn...in a crystal of c a s s l t e r i t e from Araca mine, B o l i v i a . Scale bar in urn. From Kelley and...toward lower l e f t . Kilauea I k i basalt lava lake c r u s t , Hawaii, USA, from a depth of 0.7 feet |
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