 | | Journal (article/letter/editorial) | | 277 Pandaite from the Mrima Hill niobium deposit (Kenya) By P. M. HARRIS, B.A. Warren Spring Laboratory...barium pyrochlore (pandaite) has been found at Mrima Hill (Kenya) in a residuum consisting mainly of goethite/limonite...physical, chemical, X-ray, and thermal properties the Mrima pandaite is similar to pandaites described from...niobium in the weathered residuum of the Mrima Hill (Kenya) carbonatite in association with Overseas Geological...several samples t h a t had been collected b y the Kenya Mines and Geological Department. As a result it |  | | Journal (article/letter/editorial) | | lanthanide mineralization at the Buru carbonatite centre, Western Kenya I. O. ONUONGA1,* AND P. BOWDEN2...2 ABSTR ACT The Tertiary (22 Ma) carbonatite centre at Buru hill is located towards the eastern end...end of the Nyanza rift, western Kenya. As revealed by geochemistry and petrology of drill core samples,...Mineralogically the lateritic cover of the Buru carbonatite centre is characterized by goethite, hematite...significant deviations from primary igneous carbonatite values suggesting isotopic reequilibration with |  | | Book (edition) | | Dedicated to Harry von Eckermann, an eponym for carbonatite, with admiration and affection Preface to the...this edition, summarizes the major advances in carbonatite studies in the decade 1966-1976. Since 1966 many...Certainly one of the important new facets of carbonatite study will be their saprolite geology. Recognition...Kimberlites Carbonatites and Vulcanism Geology of Carbonatite Bodies Mineralogy and Petrology Composition and...both flows and pyroclastics. The emplacement of carbonatite bodies has been accompanied by exomorphic changes |  | | Report (issue) | | IRELAND ISRAEL ITALY JAMAICA JAPAN JORDAN KAZAKHSTAN KENYA KOREA, REPUBLIC OF KUWAIT KYRGYZSTAN LAO PEOPLE’S...China (2), Egypt, Ghana, Islamic Republic of Iran, Kenya, Madagascar, Mongolia, the Philippines, Ukraine...MINERAL ORES FROM SELECTED ALKALINE CARBONATITE COMPLEXES OF KENYA .....................................characterizing and evaluating national uranium resources; Kenya focused on development of analytical techniques;...INVESTIGATORS FOR CRP IAEA Institute Member State City Kenya University of Nairobi Nairobi Title Multimodal |  | | Report (issue) | | GEOLOGICAL SURVEY Revised grade and tonnage model of carbonatite deposits by Donald A. Singer1 Open-File Report...This model applies to the descriptive model of carbonatite deposits (No. 10) by Singer (1986a) and should...groupings of these deposits. Locally these carbonatite complexes may contain economically interesting...deposits of the Mountain Pass district, San Bernardino County, California: U.S. Geological Survey Professional...Singer, D.A., 1986b, Grade and tonnage model of carbonatite deposits, in Cox, D.P., and Singer, D.A., eds |  | | Report (issue) | | Curralinho and Dattas, Diamantina, and in the Araxá carbonatite, containing an estimated 20 million tons; in...Sapucahy. At Somabula, Zimbabwe. From the Mrima Hill carbonatite, Kenya. At Issineru, Guiana. In the Bonsa River...Hot Springs, Garland Co., Arkansas; at the Silver Mine area, Madison Co., Missouri; from Indian Mountain |  | | Journal (article/letter/editorial) | | 51.4% of global REO resources are hosted by carbonatite deposits, and bastnäsite, monazite, and xenotime...further subdividing into 14 subclassifications (carbonatite, alkaline complexes and pegmatites, felsic volcanic...oxide coppergold (IOCG), granite-related skarn, carbonatite-related skarn, hydrothermal undifferentiated...Key examples Igneous Silica undersaturated Carbonatite Bayan Obo, China; Araxá, Brazil; Karonge, Burundi;...oxide copper-gold (IOCG) Skarn Granite related Carbonatite related Undifferentiated Olympic Dam, Australia; |  | | Journal (article/letter/editorial) | | Compositional Variation in Pyrochlores from the Mt Weld Carbonatite Laterite, Western Australia B. G. Lottermoser...of Newcastle, New South Wales, Australia, 2Broken Hill Proprietary Company Limited, Central Research Laboratories...laterite overlying and derived from a Proterozoic carbonatite intrusion. Leaching of the A-site ions Na and...strontian ceriopyrochlore occurs between the fresh carbonatite/laterite interface and the top of the profile...Elementen. Introduction The Proterozoic Mt Weld carbonatite is located 250 km northeast of Kalgoorlie, Western |  | | Journal (article/letter/editorial) | | of the country-rock associated with ijolite-carbonatite complexes the development of sodic amphibole...together with published analyses from fenites of Kenya, Uganda and Tanzania, include those of co-existing...emplacement of the numerous peralkalinc and carbonatite complexes discovered over the years in most parts...formed from pyroxene-gneiss (Napak), sandstones (Mrima Hill [BAKEI~, 1953]), acid volcanics (I{oma) and even...complexes of eastern Uganda and the Nyanza area of Kenya, the author and colleagues selected specimens from |  | | Report (issue) | | ~port- - - - -- - - - - - - - - Graph showing world mine production of niobium concentrate, for selected...m showing schematic cross section through a carbonatite complex - - - - - - - -- --- - Map showing location...source of niobium. These minerals are found in carbonatite, certain rocks in alkaline igneous complexes...larger, than was established when the decision to mine was made. Experts with a sound knowledge of a deposit...1970 1975 1980 1985 1990 • Year 2. World mine production of niobium concentrate, for selected |  | | Report (issue) | | Report No. 45 COLONY AND PROTECTORATE OF KENYA MINISTRY OF COMMERCE Ä N D INDUSTRY GEOLOGICAL SURVEY...corner of Kenya. It is a most important area as in its northern part there is a number of carbonatite centres...satisfactory accounts of the mode of origin of the carbonatite centres, the story being particularly clearly...plain at places that are now exposed as the carbonatite centres. The centre at Rangwa became the focus...part of the area, and it is within it that the carbonatite centres lie. The mapping has proved, however |  | | Journal (article/letter/editorial) | | by the prevalence of deposits associated with carbonatite complexes. DOI: 10.1134/S1028334X19070092 By...(b) nepheline syenites (foidic type); and (c) carbonatite complexes (carbonatitic type). Some of the deposits...share of these deposits is especially high in carbonatite complexes. The present report does not single...pyrochlore are located at the Baltic Shield (the carbonatite Siilinjärvi and nepheline syenite Saharjok 751... Baerzhe; 35, Bonga; 36, Kaluwe; 37, Mrima Hill; 38, Panda Hill; 39, Oka 40, Araxa; 41, Catalao I; 42 |  | | Journal (article/letter/editorial) | | in mineralogy and geology. The Mountain Pass carbonatite in California historically has been a major world...elements, deposits, economics, exploration, carbonatite, understanding of the mineralogy peralkaline...occurrences that are currently being few other carbonatite-related deposits in China, and the explored have...considered to be attractive targets by Mountain Pass mine in California. Mountain Pass was for companies and...Catalão I (Brazil), Mrima Hill (Kenya), Mabouni (Gabon), and several other carbonatite laterites in the |  | | Journal (article/letter/editorial) | | the weathered rocks surrounding the Mrima Hill carbonatite, Kenya, (Coetzee and Edwards, 1960), where |  | | Report (volume) | | Alma-ata, U.S.S.R. Kenya Geol. Survey Bull.-Geological Survey of Kenya Bulletin. Nairobi, Kenya. Khim Anal.... Oak Ridge, Tenn. Nucleonics-Nucleonics. McGraw-Hill Publishing Co. New York, N.Y. Nuevo Cimento-11 Nuevo...Monazite deposits in calcareous rocks, Northern Lehmi County, Idaho: Idaho Bur. Mines and Geology Pam ph. 99...Beryllium deposits of the Mount Antero region, Chaffee County, Colorado: U.S. Geol. Survey Bull. 982-D, p. 95-119...Rhabdophane from a rare-earth occurrence, Valley County, Idaho, in Geological Survey Research 1968: U.S |  | | Journal (article/letter/editorial) | | References BAKER (B. H.), 1954. Rept. Geol. Surv. Kenya, no. 27. BO~LEu (G. D.), 1963. Min. Mag., vol. 33...the weathered rocks surrounding the Mrima Hill carbonatite, Kenya, (Coetzee and Edwards, 1960), where |  | | Journal (article/letter/editorial) | | Rare-earth element mineralisation within the Mr. Weld carbonatite laterite, Western Australia B.G. LOTTERMOSER*...Rare-earth element mineralisation within the Mt. Weld carbonatite laterite, Western Australia. Lithos, 24:151-167... A thick weathering profile ofa Proterozoic carbonatite intrusion possesses exceptionallyhigh REE contents...and the ready decomposition of primary igneous carbonatite minerals. The wide range of pH and alkalinity...conditions, weathering processes, and primary igneous carbonatite mineralogy and geochemistry, various weathering |  | Melgarejo, Joan C., Costanzo, Alessandra, Bambi, Aurora C.J.M., Gonçalves, Antonio O., Neto, Andrés B. (2012) Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: The Tchivira case, Angola. Lithos, 152. 187-201 doi:10.1016/j.lithos.2012.06.024 | Journal (article/letter/editorial) | | 2012 Available online 28 June 2012 Keywords: Carbonatite Pyrochlore Niobium Magmatic Hydrothermal Supergenic...distribution. From the host rock to the centre of the carbonatite intrusion, the succession of alteration types...fluorite or as veinlets in fluoritized/silicified carbonatite. Minerals associated with Sr-, Ba- and Pb-pyrochlores...2004). These minerals are found in nearly all carbonatite types and their chemical composition is widely...number of pyrochlore compositions within the same carbonatite. This diversity in composition is interpreted |  | | Journal (article/letter/editorial) | | Northern Ireland The isotopic comp~i~on of carbonatite =a kimberlite carbonates andtheir bearing on...on the carbon isotopie composition ranges of carbonatite and kimberlite carbonates shows that they are...isotopio oomposition of carbonates from 22 selected carbonatite complexes ( --6*1yW, 8 = fl*40/, vs PDB) is indistingnishable...~~bona~s of higher @a content ( -2.4 to -4~433. If carbonatite and kimberlite carbonates ae well as diamonds...be meaningless, as the source of kimberlite, carbonatite and diamond carbon may not be isotopically uniform |  | | Report (issue) | | able.pdf. Cover. The Mountain Pass Mine, San Bernardino County, California, was the only active producer...United States in 2013. The orebody is a tabular carbonatite intrusion and is thought to be the largest REE....O6 Rare-Earth-Element-Mineral Formation in Carbonatite Magmas.....................................O7...............................................O21 Mine Waste Characteristics.........................................................................O22 Mine Closure........................................ |  | | Journal (article/letter/editorial) | | niobium, metallogeny of tantalum, tantaloniobates, carbonatite, nepheline syenite, alkali granite, syenite,...(Fennoscandian) Shield, namely, Siilinjärvi carbonatite and Saharjok nepheline–syenite (Zozulya et al...Baerzhe; (35) Bonga; (36) Kaluwe; (37) Mrima Hill; (38) Panda Hill; (39) Oka; (40) Araxa; (41) Catalão I;...Fir Chuktukon Toongi Baerzhe Bonga Kaluwe Mrima Hill Panda Hill Oka Araxa Catalão I Catalão II Salitre Tapira...means alkali granite; as, alkali syenite; cb, carbonatite; h, hydrothermal ore; ns, nepheline syenite; |  | | Journal (article/letter/editorial) | | placer deposits and weathered crusts overlying carbonatite and peralkaline complexes account for the majority...majority of Ta production. Several carbonatite-related deposits (e.g. Upper Editorial handling: D. Huston...% from tin slag refining and 10 % from secondary mine concentrates. Due to rapid industrialisation and...Weathered crusts overlying carbonatite complexes in Brazil and one hard rock carbonatite deposit in Canada account...account for about 92 and 7 % of Nb world mine production, respectively. Since the bulk of the production |  | | Journal (issue) | | Number59 Lead-zinc deposits of the Coast Province of Kenya and some exploration guidelines Overseas Geology...Kinagoni Mine 7 4 Geological section, Kinagoni Mine North 8 5 Geological section, Kinagoni Mine South 9...1982 Lead-zinc deposits of the Coast Province of Kenya and some exploration guidelines S. F. BUGG ABSTRACT...Per1110-Triassic rocks of the Coast Province of Kenya several small and one large occurrence of lead mineralisation...plain. The largest of these occurrences, at Kinagoni Hill is composed of a stockwork of minor veins within |  | Taylor, Ryan D., Shah, Anjana K., Walsh, Gregory J., Taylor, Cliff D. (2019) Geochemistry and Geophysics of Iron Oxide-Apatite Deposits and Associated Waste Piles with Implications for Potential Rare Earth Element Resources from Ore and Historical Mine Waste in the Eastern Adirondack Highlands, New York, USA. Economic Geology, 114 (8) 1569-1598 doi:10.5382/econgeo.4689 | Journal (article/letter/editorial) | | Earth Element Resources from Ore and Historical Mine Waste in the Eastern Adirondack Highlands, New York...mined in the United States since the Mountain Pass mine, California, was put on care and maintenance at...boulder-sized clasts pulled from the mine and deposited near the mine openings, and tailings piles, which...Library - Acquisitions user REE RESOURCES FROM MINE WASTE, EASTERN ADIRONDACK HIGHLANDS, USA 73°40’...Fisher Hill Cookshaft N Orchard pit Barton Hill gate 6 Barton Hill gate 7 Arch pit Welch pit County pile |  | | Journal (article/letter/editorial) | | whole rock isochrons for the Monchique and Mt. Kenya complexes, together with a series of 87Sr/86Sr ratios...generally been regarded as the immediate parent of carbonatite complexes (Heinrich, 1966). The study of strontium...mantle-derived magmas (e.g. Philpotts, 1974). Those of carbonatite complexes, however, have been explained through...nepheline syenites of many of the E. African carbonatite complexes are small in extent, variable in texture...material into carbonatite (Dawson, 1966) ; iii) products of reaction between basalt and carbonatite (Van Groos |
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