 | | Journal (article/letter/editorial) | | lateritic manganese ore deposit of Tambao (northern Burkina Faso), a present unexploited deposit among...collected from the massive 80-m high Mn-rich hill at Tambao. A detailed petrographical study shows that these...mm/Ma. These ages clusters show that weathering at Tambao was functioning during the early Eocene and thus... Hénocque et al. Fig. 1. (a) Location of the Tambao Manganese deposit. (b) Topographical map of the...generations in concretions collected at Tambao deposit (Burkina Faso), one of the cryptomelane-richest deposit |  | | Journal (article/letter/editorial) | | dans t rois gisements d'Afrique de I'Ouest Mokta, Tambao, Nsuta E. A. Perseil Laboratoire de Mineralog:ie...ensuite des oxydes stables: cryptom61ane, nsutite, ramsdellite. Cette derni@re, bien repr6sent6e dans les minerals...Gisements de manganese: A: Mokta. B: Nsuta. C: Tambao . . ,. . . . Par l'analyse min~ralogique...d'Afrique de l'Ouest; Tambao, dans la zone sah~lienne. Si l'on dolt tenir Mokta et Tambao comme de petits gisements...plus marqu6 ~ Tambao off apparaissent des gneiss fins et des amphibolites..A Nsuta et ~ Tambao, des intrusions |  | | Book | | Deposits (Nsuta, Ghana; Mokta, Cöte d'Ivoire; Tambao, Burkina Faso (Upper Volta» 2.2.3.1. Geological Setting...Alteration 2.2.3.2.1. Nsuta 2.2.3.2.2. Mokta 2.2.3.2.3. Tambao 2.2.3.3. Mineralogy and Geochemistry of the Late...General characteristics 2.2.3.3.2. Mokta 2.2.3.3.3. Tambao 2.2.3.3.4. Nsuta 2.2.3.4. Features of the Protore...Paleokarst: Deposits of the Postmasburg Region, Griqualand West, Cape Province, South Africa 3.3.1. Geological...Bishop, Lohatlha, Glosam, and Kapstewel, Postmasburg Region, Griqualand West 3.3.2.3. Processes of the Manganese |  | | Journal (article/letter/editorial) | | These latter minerals can locally evolve into ramsdellite or pyrolusite. The associated nsutite and lithiophorite...transformed into well-crystallized fanshaped ramsdellite, which can be analyzed by microprobe (Table VII)...L E VII Chemical compositions of Ziemougoula ramsdellite 1 SiO~ MnO 2 A1203 Fe203 Cr;O 3 CocO 3 MgO CaO...(1978) stressed that the presence of birnessite in Tambao (northern Upper Volta) is generally linked to the...spessartite in the gondites of Mokta (Ivory Coast), Tambao (Upper Volta) and Nsuta (Ghana) (Perseil and Grandin |  | | Journal (article/letter/editorial) | | africains Dans les grands gisements africains (Tambao, Haute Volta, Mokta-Cdte d'Ivoire, Moanda-Gabon)...Roman6chRes de la zone de cuirasse du gisement Tambao (Haute Volta) - (Collection G. Grandin) Analyste...r6flectance de la pyrolusite Py (35-40~o), de la ramsdellite Ram. (35 ~), et de la phase p-MnO2 (30 ~o), mesurde...pyrolusite (Py), de la phase p-MnO2, et de la ramsdellite (Ram). Ces trois 6ehantillons proviennent du...r6flectance pour diff6rentes cryptom61anes. 7 et 10: Tambao (Haute Volta), 8: Nsuta (Ghana) Fig. 5. Dispersion |  | | Journal (article/letter/editorial) | | Cette derni6re fait partie, avec nsutite et ramsdellite, des formes les plus stables dans les conditions...des grenats. Quelques 6chantillons du gisement de Tambao, dans la r6gion sah61ienne du nord de la Haute-Volta...de Mokta, 5 fi 50 g pour l'6chantillon HV 16 de Tambao. I1 varie assez largement dans un m~me gisement...p61e grossulaire, jusqu'/~ 19% pour les grenats de Tambao, ne d6passant pas 7,5% pour les grenats de Mokta...grenats. 1,2,3: Mokta (SS68) grenats de 40 g - 4,5,6: Tambao (HV16) nats de 10 ~ 20 ~t 10,11:Borumba (EEl) 1 |  | | Journal (article/letter/editorial) | | pseudornorphoses "~ Nsutite (2) _ recristallisations A Ramsdellite A Pyrolusite • Cryptomelane (3) _ retromorphoses...recristallisations en cryptom~lane, nsutite et ramsdellite qui effacent les structures en <>...de recristallisation/~ cryptom61ane-nsutite-ramsdellite et les limites des ~lots r6siduels sont irr6gulibres...et nsutite recristallisent partiellement en ramsdellite. Le quatri6me stade est celui de l'6volution...en regard de la todorokite, la pyrolusite, la ramsdellite et la lithiophorite. 3. Le protore est essentiellement |  | | Book | | Semi-Arid Regions: the Brazilian Sertao and the African Sahel .................... . . 157 1 Introduction ....plasma. To what extent these processes affect any region on earth depends on the processes involved, on...also found in the Ifni granite of the Anti-Atlas region, Morocco, for instance. First case: calcite replaces...barite in certain Parna soi ls of the Murrumbidgee region, New South Wales.Aust JSci 20:274- 275 Bech J,...mulations calca ires dans les limons de Matmata de la region de Ga bes en Tunisie.Sci Geol Bull (Strasb) 37:387-398 |  | | Journal (article/letter/editorial) | | Birimian rocks that form part of the Eburnian province of the Man Shield in the southern segment of the...(occurring in the form of relics) and pyrolusite (and ramsdellite) which replaces manganite. The orebody The...trois gisements d' Afrique de l' Ouest: Mokta, Tambao, Nsuta. Mineralium Deposita 13: 295±311 Plimer |  | | Book (edition) | | yes Pseudomalachite Guyanaite Xenotime-(Y) Ramsdellite Reflection Colour & Ø Reflectance violet to... Mineral Descriptions Molybdenite in Graphite; Bogala Mine, Sri Lanka 51 Copper, native Synonym(s): Cuivre...of cuprite (bluish grey); North Mine (North Broken Hill Mine; NBH Mine), Broken Hill, Yancowinna Co.,...internal reflections); Madenköy Mine, Çayeli, Rize Province, Black Sea Region, Turkey (sample: Halbach); XPL...(greenish grey; arg); Monte Narba Mine, San Vito, Cagliari Province, Sardinia, Italy; PPL B Same sample |  | | Book (edition) | | Woodruffite IV/D.09-30 Romanéchite IV/D.10-10 Ramsdellite Nsutite IV/D.10-20 Anatase IV/D.14-10 Wolframite...(yellowish white), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // Anhedral electrum...(greenish grey), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // Anhedral electrum...(bluish grey shades), quartz (dark grey); New Bullfrog mine, Nye Co., Nevada, USA [h]; Nic. // 8 Gold A ...sample - photo A), dolomite (dark grey); Harstigen Mine, Pajsberg, Filipstad, Värmland, Sweden [j]; Nic |  | | Book (volume) | | reported from alluvial deposits of the centrat Aldan region, see pp. 11/2. Solid Salutions of Mn with Native...altered olivine-leucite basalt of the Koshmansai region, Kurama Range, Uzbekistan, an Mn-rich phase was...eruptive breccias near Volnovakha, eastern Asov Sea region, Ukraine. The steel gray silicides have a metallic...well as Malaya and 8ol'shaya Yukhta, centrat Aldan region, Eastern Siberia, Russia. Associated in the heavy...Mn sphalerites from the Pai-Khoi Novaya Zemelya province given in [96]. For a ZnS-MnS-CdS composition diagram |  | | Book | | metalliferous region has been eroded affects its present characteristics as a minera1 province, because of...sills), if they are exposed in outcrop or in the mine workings at all. The Climax Mo complex is the best...known (e.g. the Montana Tunnels deposit, Obelisk Mine). The former locality contains disseminated pyrite...BALKHASH (PRIBALKHASH) REGION, KAZAKHSTAN, U.S.S.R. This is an outstanding region of Permo-Carboniferous...stratovolcanoes. The region is densely mineralized and contains the principal Soviet porphyry Cu-Mo province estimated |  | | Book (edition) | | Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California, G Publi!>hed by Grdllit.u.o. Stefanikova43...expressed in abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture)...abbreviated, e.g. canton (Switzerland), vilayet (Turkey), region (Chile), kray and oblast (Russia). The country...rich Katanga province was renamed Shaba by Mobutu, and is now the Katanga administrative region again. The...The former Kivu province is now divided to three regions: INTRODUCTION Nord-Kivu, Sud-Kivu, and Maniema |  | | Book | | metalliferous region has been eroded affects its present characteristics as a mineral province, because of...sills), if they are exposed in outcrop or in the mine workings at all. The Climax Mo complex is the best...known (e.g. the Montana Tunnels deposit, Obelisk Mine). The former locality contains disseminated pyrite...BALKHASH (PRIBALKHASH) REGION, KAZAKHSTAN, U.S.S.R. This is an outstanding region of Permo-Carboniferous...stratovolcanoes. The region is densely mineralized and contains the principal Soviet porphyry Cu-Mo province estimated |  | | Report (volume) | | mineralization in the PlioceneQuaternary Calatrava Region (central Spain) 29 43 81 91 105 117 123 139...lacustrine formation in a Tertiary continental-volcanic province. The ores (braunite, pyrolusite) interfinger with...the West African craton (Ghana, Ivory Coast, Burkina Faso, Mali, Eastern Liberia, Guinea) is unique among...intracontinental rift; Mn Tambao, Burkina carbonate in black shale in Faso transition zone between volcanic...Para), G a b o n (Moanda), Ghana, Ivory Coast, Burkina Faso, Eastern Liberia, and Mexico (Molango); smaller |
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