 | Mogessie, A., Krenn, K., Schaflechner, J., Koch, U., Egger, T., Goritchnig, B., Kosednar, B., Pichler, H., Ofner, L., Bauernfeind, D., Tadesse, S., Demessie, M. (2002) A geological excursion to the Mesozoic sediments of the Abay Basin (Blue Nile), recent volcanics of the Ethiopian main rift and basement rocks of the Adola Rea, Ethiopia. Mitteilungen der Ăsterreichischen Mineralogischen Gesellschaft, 147. | Journal (article/letter/editorial) | | MAIN RIFT AND BASEMENT ROCKS OF THE ADOLA REA, ETHIOPIA by A. Mogessie, K. Krenn, J. SchaïŹechner, U...Addis Ababa University, Ethiopia 2Ethiopian Institute of Geological Surveys Ethiopia 43 44 1. GENERAL...INTRODUCTION The ïŹeld excursion to Ethiopia took place from April 5 to 22, 2001. Ethiopia has a varied geology and...making up the Ethiopian plateau; ii) the Main Ethiopia Rift containing a number of lakes and geothermal...ïŹelds and iii) the Adola gold belt including the Kenticha tantalum-bearing pegmatites (Fig. 1). Nine earth |  | KĂŒster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, OberthĂŒr, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb age and Ta mineralization. Mineralium Deposita, 44 (7) 723-750 doi:10.1007/s00126-009-0240-8 | Journal (article/letter/editorial) | | 1007/s00126-009-0240-8 ARTICLE The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, UâPb...Springer-Verlag 2009 Abstract The Kenticha rare-element pegmatite, a globally important tantalite source...source in the Neoproterozoic Adola Belt of southern Ethiopia, is a highly fractionated, huge (2,000 m long...rareelement pegmatite class and belongs to the lithiumâcesiumâ tantalum petrogenetic family. The Kenticha pegmatite...an internal geochemical differentiation of the pegmatite sheet proceeding from the lower zone (K/Rb ~36 |  | | Journal (article/letter/editorial) | | the PanAfrican Rocks of the Adola Area, Southern Ethiopia Solomon Tadesse Depnutnienf of Geology and Geophysics...Adola volcano-sedimentary sequence, in southern Ethiopia. Two major mineralized belts can be recognized:...recognized: the Megado ('Gold Belt') and the Kenticha Belts. The Kenticha Belt is also known for its rare metal...exploration programme Key words: Adola, gold, Kenticha, Lega Dembi, Pan-African, rare metal, Sakaro....placers, have been reported from various regions in Ethiopia. However, the Adola Goldfield is the only one |  | | Report (issue) | | brucite of yore from the Tilly Foster mine in New York or Woodâs Chrome mine in Pennsylvania. In that the new...suggests material found in 2005 in the NâChwaning III mine in South Africa, but NâChwaning brucite is graywhite...fine cerussite specimens from the old Monteponi mine, Sardinia, Italy, which Tomek Praszkier of Spirifer...finds in the 1980s in an old, presumably unnamed mine on the property of the PiquĂn farmhouse in CĂłrdoba...little things from the Jeffrey mine, Asbestos, Quebec: the enormous asbestos mine closed for good at the outset |  | | Report (issue) | | ............................................M24 Mine Waste Characteristics ........................................................................M27 Mine Closure ..........................................regional lithium-cesium-tantalum rare-metalbearing pegmatite zoning above a parental granite.................zoned lithium-cesium-tantalum rare-metal-bearing pegmatite..............................................................M21 M13. Bar charts showing global mine production of niobium and tantalum, from 2000 to |  | | Journal (article/letter/editorial) | | southern Ethiopia Lulu Tsige a , Mohamed G. Abdelsalam b,â a Geological Survey of Ethiopia, Department...Regional Mapping, Addis Ababa, P.O. Box 2302, Ethiopia b The University of Texas at Dallas, Department...metamorphic data from the Bulbul Belt in southern Ethiopia indicating that the latest phase of the Neoproterozoic...migmatitic layering that is not evident elsewhere in the region. This older planar fabric is discordantly overprinted...the Neoproterozoic N-trending belts in southern Ethiopia were roots of northward expulsion of the Arabian-Nubian |  | | Journal (issue) | | Decade of Change A New Era for the Historic Coscuez Mine Esmeraldas Santa Rosa: Our Wealth is Green Rediscovery...More Exquisite Emeralds Magnificent Old Mine Emeralds 143 Mine Visit A Visit to Colombiaâs âGreenâ Emerald...acquiring the majority stake in the iconic Coscuez mine in Colombia. The 2015 Symposium focused on the governmentâs...have also seen new discoveries of emeralds in Ethiopia and increased awareness of the green gem from...confidence in gem purchases now starts at the mine in the broader mine-to-market concept. Another major change |  | Aurisicchio, Carlo, Conte, Aida M., Medeghini, Laura, Ottolini, Luisa, De Vito, Caterina (2018) Major and trace element geochemistry of emerald from several deposits: Implications for genetic models and classification schemes. Ore Geology Reviews, 94. 351-366 doi:10.1016/j.oregeorev.2018.02.001 | Journal (article/letter/editorial) | | distinguishes the emerald deposits related to granite-pegmatite intrusion from those controlled by tectonic structures...the phlogopitebearing contact zones, between pegmatite and surrounding Cr-bearing mafic-ultramafic rocks...pre-Karoo age. The genetic model for emerald-bearing pegmatite (Maria III and Niane) involves the intrusion of...with quartz, feldspar, and topaz occur in small pegmatite pockets (up to 8 cm in size) at the contact granite-country...The metamafic horizons are overlapped by a major field of Be-bearing pegmatites and hydrothermal veins |  | | Journal (article/letter/editorial) | | geology of the Lega Dembi gold deposit, southern Ethiopia: implications for Pan-African gold exploration...Dembi deposit is the largest gold producer in Ethiopia. It is situated in late-Precambrian metamorphosed...lateProterozoic Adola granite-greenstone terrane in southern Ethiopia. The lode-gold mineralization occurs in a N-S...belts. The Lega Dembi gold mine in the Sidamo region of southern Ethiopia is the largest gold producer...lithostratigraphic and structural evolution of the region have been proposed. However, because of the relatively |  | | Book | | crystals on large, well-formed grey graphite crystals, field of view 3 cm - Philip Hitge specimen, Bruce Cairncross...runs from Madagascar through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa,...countries are among the finest in the world. The region and its gems are particularly dear to my family...most renowned gemstones from East Africa, this region is also host to some of the world's finest examples...several other varieties of gemstone occur in the region and, while perhaps not as popular, these too have |  | | Journal (article/letter/editorial) | | gold mineralization in the Okote area, southern Ethiopia DEBELE J. D EKSISSA1,2 and C HRISTIAN KOEBERL2*...KOEBERL2* 1 2 P.O. Box 28503, Addis Ababa, Ethiopia Department of Geological Sciences, University of Vienna...mineralization of the Okote area is located in southern Ethiopia. Three NS striking ductile shear zones, with different...minerals of the veins and their wall rocks are pyrite, chalcopyrite, pyrrhotite, gold, and accessory...Keywords: gold mineralization, fluid inclusion, Ethiopia, tourmaline, rare earth element deposit and ubiquitous |  | | Journal (article/letter/editorial) | | the Lega Dembi Gold Deposit, Adola Gold Field, Southern Ethiopia Solomon Tadesse Department of Geology...Addis Ababa University, PO. Box 1176, Addis Ababa, Ethiopia (Manuscript received March 12,2003; accepted January...The Lega Dembi Primary Gold Deposit in southern Ethiopia is related to the shear zone-hosted vein in the...origin related to mafic volcanism. Key words: Ethiopia, Lega Dembi, gold, volcano-sedimentary sequence...south of Addis Ababa in the Adola belt, southern Ethiopia. The deposit is located along the Lega Dembi-Aflata |  | | Journal (article/letter/editorial) | | Assessing copper fertility of intrusive rocks using field portable X-ray fluorescence (pXRF) dataâAyesha Ahmed...skarn-porphyry Cu-Au-Fe deposit, eastern Transbaikal region, Russia: Genetic implicationsâV.A. Kovalenker,...alluvial placers of the Krasnovishersky district (Ural region)â E.A. Vasilev, I.V. Klepikov, and L.I. Lukianova...Nb- and Ta-bearing biotite from the Lizaizhai pegmatite (Guangning ore district, Guangdong, south China):...of the newly discovered late Mesozoic granite-pegmatite and associated Sn-Nb-Ta-Be mineralization in the |  | El Ghorfi, M., Melcher, F., OberthĂŒr, T., Boukhari, A. E., Maacha, L., Maddi, A., Mhaili, M. (2008) Platinum group minerals in podiform chromitites of the Bou Azzer ophiolite, Anti Atlas, Central Morocco. Mineralogy and Petrology, 92 (1) 59-80 doi:10.1007/s00710-007-0208-2 | Journal (article/letter/editorial) | | arsenide was used for As, pentlandite for Ni, and pyrite and stibnite for S. K X-ray lines were employed...Al Ays, Saudi Arabia (Quick, 1990), and Kenticha Hills, Ethiopia (Bonavia et al., 1993). Highly metamorphosed...compositions plot at the high-Cr end of the Alpine-type field, matching ââtype IIIââ peridotites of Dick and Bullen...Neoproterozoic chromitites. Five samples from Kenticha Hills, Ethiopia, yielded total PGE slightly lower than...Reminex Exploration is thanked for support during field work. The critical input by the journal reviewers |  | Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) | | type, in terms of production, is the desilicated pegmatite related type that formed via the interaction of...of previous beryllium mineralization, such as pegmatite intrusions in mafic-ultramafic rocks. Such new...ct. Insufu rough emerald extracted from the Kagem mine in 2015. Lastly, on the 2th of October, the remarkable...(âthe lion elephantâ) was extracted from the same mine [3]. Other giant crystals have been discovered in...emerald crystals was discovered in the CarnaĂba mine, Brazil; the specimen weighed 341 kg with 1.7 million |  | Li, Peng, Li, Jiankang, Chou, I-Ming, Wang, Denghong, Xiong, Xin (2019) Mineralization Epochs of Granitic Rare-Metal Pegmatite Deposits in the SongpanâGanzĂȘ Orogenic Belt and Their Implications for Orogeny. Minerals, 9 (5) 280 doi:10.3390/min9050280 | Journal (article/letter/editorial) | | Mineralization Epochs of Granitic Rare-Metal Pegmatite Deposits in the SongpanâGanzĂȘ Orogenic Belt and...2019 Abstract: Granitic pegmatite deposits, which are usually products of orogenic...Xuebaoding, Zhawulong, and Keâeryin rare metal pegmatite deposits are located in the southern, western...muscovite ArâAr age of 159.0 ± 1.4 Ma from spodumene pegmatite of the Keâeryin deposit. Combining these ages...that the crystallization of the corresponding pegmatite ceased at approximately 199â196, 195â190, 189â187 |  | | Journal (article/letter/editorial) | | prospect case study, Kiggavik, northeast Thelon region (Nunavut, Canada)âRĂ©gis Roy, Antonio Benedicto...Gertzbein The precious opal deposit at Wegel Tena, Ethiopia: Formation via successive pedogenesis eventsâBoris...origin of alluvial sapphires from the Orosmayo region, Jujuy Province, northwest ArgentinaâStephen J...antimony mineralization in the Adychanskii ore region (East Yakutia, Russia)âV.V. Aristov, S.G. Kryaghev...Early Proterozoic gabbroids in the northern Ladoga regionâ Sh.K. Baltybaev, G.V. Ovchinnikova, and V.A. Glebovitskii |  | | Journal (article/letter/editorial) | | gold-quartz-tourmaline veins of the Okote area, southern Ethiopia: implications for gold exploration D. J. Deksissa...quartz, carbonates, and tourmaline, with minor pyrite, and accessory chalcopyrite, pyrrhotite, and gold...gold mineralization in the Adola Belt, southern Ethiopia. 102 D. J. Deksissa and C. Koeberl Introduction...provinces, such as in the Precambrian basement of Ethiopia (Augustithis, 1967), Brazil (Fleischer and Routhier...tourmaline is a potential pathÂźnder mineral for source region and vein gold mineralization. The composition of |  | | Journal (article/letter/editorial) | | and tholeiitic series rocks from Adola, southern Ethiopia B e g a s h a w W o l d e a,c,*, Z e m e n e A...Addis Ababa University, PO. Box 1176, Addis Ababa, Ethiopia I, Lege Dembi-Sakarro Primary Gold Exploration...Development Project, PO. Box 17, Shakisso, Sidamo, Ethiopia c Division of Applied Geology, Luleflt University...accepted 20 March 1996 Abstract In Adola, southern Ethiopia, mafic and ultramafic igneous rocks occur in narrow...highlight that the high-grade rocks in southern Ethiopia and northern Kenya include a significant portion |  | Yan, Qinggao, Li, Jiankang, Li, Xingjie, Liu, Yongchao, Li, Peng, Xiong, Xin (2020) Source of the Zhawulong granitic pegmatite-type lithium deposit in the Songpan-GanzĂȘ orogenic belt, Western Sichuan, China: Constrants from Sr-Nd-Hf isotopes and petrochemistry. Lithos, 378. 105828pp. doi:10.1016/j.lithos.2020.105828 | Journal (article/letter/editorial) | | Journal Pre-proof Source of the Zhawulong granitic pegmatite-type lithium deposit in the Songpan-GanzĂȘ orogenic...Li, et al., Source of the Zhawulong granitic pegmatite-type lithium deposit in the Songpan-GanzĂȘ orogenic... Journal Pre-proof Source of the Zhawulong Granitic Pegmatite-type Lithium Deposit in the Songpan-GanzĂȘ Orogenic...Abstract na The Zhawulong ore field hosts lots of rare-element pegmatite dikes and is an important producing...ore-forming processes for granite and pegmatite in the Zhawulong ore field, as well as the petrogenetic links |  | | Journal (issue) | | danburite from Namalulu, Tanzania|Emerald from Ethiopia|Vivid purplish pink fluorite from Illinois, USA|...Mountains of southwest Utah, USA. The Ruby Violet mine was the only commercial source of gem-quality red...El Guanaco in the Taltal area of the Antofagasta Region, Chile. He kindly donated a 1.45 ct stone to Gem-A...mined from granitic pegmatites in the Morogoro region of central Tanzania (Chadwick and Laurs, 2008)...several weak bands were recorded in the visible region at approximately 525, 567, 577, 584, 732, 744 and |  | | Journal (article/letter/editorial) | | 081.107. monazite, xenotime, native bismuth and pyrite. Alteration processes were mainly albitization...Keppler, 1997; Linnen, 1998; London, 2008) and field evidences in pegmatites (Dewaele et al., 2015) and...obtained from the ancient open pit of the Penouta mine (Fig. 1), corresponding to the apical zone. Whole...beryl, apatite, monazite, xenotime, zircon, rutile, pyrite and native bismuth, fluorite, uraninite, Fe, Mn...existence of these stages has been supported by field and geochemical evidence and also by a fluid inclusion |  | | Journal (article/letter/editorial) | | Pentlandite, pyrrhotite, arsenopyrite, gersdorffite and pyrite are the most common sulphide minerals. Gold occurs...associated with gersdorffite, arsenopyrite, and Asârich pyrite or as native nuggets in listwaenites of Barramiya...metavolcanics (Elâ long, ~100 mâwide elongate body at the mine area along a ~ EâWâ Sayed, Furnes, & Mohamed, 1999)...immature crystals or as an oxidation product after pyrite (Figure 4c). Late (secondary) magnetite, which...slabs. They are represented by pyrite, pyrrhotite and pentlandite. Pyrite is an isotropic mineral with |  | | Report (issue) | | FRONTISPIECE: Historic pump at the Wodgina tantalumâtin mine. Brought from Port Hedland by camel train about...manganotantalite crystals from Moolyella, Pilbara region. Simpson Collection, Western Australian Museum........................ 24 Regional rare-metal pegmatite zoning and lithogeochemical anomalies ................................................... 25 Pegmatite dimensions and structure .............................. 63 Bernic Lake tantalumâlithiumâcaesium mine ............................................... |  | Azer, M. K., Samuel, M. D., Ali, K. A., Gahlan, H. A., Stern, R. J., Ren, M., Moussa, H. E. (2013) Neoproterozoic ophiolitic peridotites along the Allaqi-Heiani suture, South Eastern Desert, Egypt. Mineralogy and Petrology, 107 (5) 829-848 doi:10.1007/s00710-012-0204-z | Journal (article/letter/editorial) | | Arabia and are suspected to exist in Eritrea, Ethiopia, and Kenya. The ANS ophiolites range in age from... This is particularly unfortunate because this region hosts the only true suture zone in Egypt, the Allaqi-Heiani-Gerf...researchers to begin studying ophiolites in this region; accordingly the significance of these rocks in...was then shortened E-W, most importantly in the region along the N-S Hamisana Shear Zone (de Wall et al...2002; Oweiss et al. 2001; Zoheir 2008; Azer 2012). Field description The present study concentrated on two |
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