 | | Journal (article/letter/editorial) | | Schneider The geology of the Lega Dembi gold deposit, southern Ethiopia: implications for Pan-African...January 1997 Abstract The Lega Dembi deposit is the largest gold producer in Ethiopia. It is situated in late-Precambrian...sediments of the N-S trending, volcanosedimentary Megado belt, which forms part of the lateProterozoic Adola...southern Ethiopia. The lode-gold mineralization occurs in a N-S trending, steep westerly dipping quartz-vein...gneisses and the volcanosedimentary sequence of the Megado belt. This contact also marks the northernmost |  | | Journal (article/letter/editorial) | | the PanAfrican Rocks of the Adola Area, Southern Ethiopia Solomon Tadesse Depnutnienf of Geology and Geophysics...sequence, in southern Ethiopia. Two major mineralized belts can be recognized: the Megado ('Gold Belt') and...in two most important primary gold deposits of Lega Dembi and Sakaro. The primary gold deposits are classified...to conglomerates and meta-arkoses - auriferous quartz veins in high grade gneiss rocks This classification...programme Key words: Adola, gold, Kenticha, Lega Dembi, Pan-African, rare metal, Sakaro. Introduction |  | 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 Österreichischen Mineralogischen Gesellschaft, 147. | Journal (article/letter/editorial) | | MAIN RIFT AND BASEMENT ROCKS OF THE ADOLA REA, ETHIOPIA by A. Mogessie, K. Krenn, J. Schaflechner, U...Addis Ababa University, Ethiopia 2Ethiopian Institute of Geological Surveys Ethiopia 43 44 1. GENERAL...INTRODUCTION The field 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...details. 45 2. INTRODUCTION TO THE GEOLOGY OF ETHIOPIA The basement upon which all the younger formations |  | | Journal (article/letter/editorial) | | Mineralization of the Lega Dembi Gold Deposit, Adola Gold Field, Southern Ethiopia Solomon Tadesse Department...Addis Ababa University, PO. Box 1176, Addis Ababa, Ethiopia (Manuscript received March 12,2003; accepted January...Abstract ........ The Lega Dembi Primary Gold Deposit in southern Ethiopia is related to the shear...rocks consists of a sequence of biotite-feldspar-quartz schists, carbonaceous mica-schists, amphibolites...volcano-sedimentary sequence and consist of swarms of quartz veins, lenses, and stockworks that propagated along |  | | Journal (article/letter/editorial) | | purposely lacking, as all information on regional and mine geology, host rock and ore sample descriptions,...India; Pilgrim’s Rest [30–33], South Africa; Lega Dembi, Ethiopia [34]; Navachab, Namibia [35–40]; Mindyak...Africa, three in India, two in Russia, one in Ethiopia, Brazil and Indonesia. The geographic diversity...Cuiabá, Hutti, Ajjanahalli, Hira Buddini and Lega Dembi are situated in greenstone belts, Renco formed...Ajjannahalli Renco Hutti Hira Buddini Pilgrim’s Rest Lega Dembi Navachab Mindyak Kochkar Awak Mas Barberton |  | | Journal (article/letter/editorial) | | Structure of Precambrian Rocks in the Adola Goldfield (Ethiopia) based on Two Generations of Interference Pattern...Institute of Geological Survey of Ethiopia, P.O. Box 5580, Addis Ababa (Ethiopia) (Received December 71 1987;...structure of Precambrian rocks in the Adola Goldfield (Ethiopia) based on two generations of interference pattern...mapped in Precambrian rocks of the Adola Goldfield (Ethiopia). The F2 phase folded pre-existing planes (D1)...been active in the !ate Precambrian of southern Ethiopia. Introduction It is now generally accepted that |  | | 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...transitional zone, and mylonite zones. Auriferous quartz-carbonate-tourmaline veins occur mainly in the...Primary fluid inclusion data from auriferous type 2 quartz veins (qv 2) indicate aqueous-carbonic inclusions |  | | 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...University, PO. Box 1176, Addis Ababa, Ethiopia I, Lege Dembi-Sakarro Primary Gold Exploration and Development...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 |  | | Report (issue) | | = 39.94(3) Z=3 X-ray Powder Pattern: Orijärvi mine, Finland. 3.072 (100), 2.246 (80), 2.112 (80), 1...93 (2) 15.4 3.3 Total 99.88 100.0 (1) Orijärvi mine, Finland; after deducting 4% of galena, sphalerite...Finland). In veinlets in quartz-anthophyllite-cordierite-biotite rocks (Orijärvi mine, Association: Chalcopyrite... molybdenite, silver, pyrite, galena (Orijärvi mine, Finland); tetrahedrite–tennantite, luzonite–famatinite...nekrasovite, chalcopyrite, emplectite, bismuth, calcite, quartz, barite (Kuramin Mountains, Uzbekistan); nevskite |  | “Beraki, W. H., Bonavia, F. F., Getachew, T., Schmerold, R., Tarekegn, T. (1989) The Adola Fold and Thrust Belt, southern Ethiopia: a re-examination with implications for Pan-African evolution. Geological Magazine, 126 (6) 647-657 doi:10.1017/s0016756800006944 | Journal (article/letter/editorial) | | 647 The Adola Fold and Thrust Belt, southern Ethiopia: a re-examination with implications for Pan-African...Project, UNDP ETH 86/034, P.O.Box 5580, Addis Ababa, Ethiopia t Cooperazione Italiana Universitaria, c/o Department...Geology, Addis Ababa University, Addis Ababa, Ethiopia (Received 10 October 1988; accepted 7 February...1989) Abstract - The Adola Fold and Thrust Belt of Ethiopia is a late- Precambrian, north-south trending belt...(F3), which imparted the dominant structure of the region; (4) F3 was later gently affected, at right angles |  | | Journal (article/letter/editorial) | | Finnish deposits; Mariko et al. (1973) from Kamaishi mine, Japan; Groves and Hall (1978) from Mount Windarra...and Prewitt (1975) for the pentlandite from Frood Mine, its linear thermal expansion at 200оС is 1.2%,...respect: 30 1. In the quartz-sulphide ores of Lega Dembi gold deposit in Ethiopia, Cook and Ciobanu (2001...Russian). Benvenuti, M. 1991. Ni-sulphides from Bottino mine Represented mineral relations are hard to observe...telluride mineralogy of the Lega Dembi shear zone hosted gold deposit, Ethiopia. – In: Piestrzynski, Ad (ed |  | | Journal (article/letter/editorial) | | petrography of gold-quartz-tourmaline veins of the Okote area, southern Ethiopia: implications for gold...revised version accepted July 23, 2001 Summary Quartz-tourmaline vein-hosting rocks of the Okote area...Neoproterozoic Adola Belt. Metasomatic auriferous quartz-tourmaline veins occur in ductile N±S trending...sinistral shear zones. These veins commonly contain quartz, carbonates, and tourmaline, with minor pyrite...isolated euhedral crystals in the fracture surfaces of quartz carbonate veins. Many of the tourmaline crystals |  | | Journal (article/letter/editorial) | | have described “selenian pilsenite” from Lega Dembi, Ethiopia (Cook & Ciobanu 2001b) and include an analytical...native bismuth (Bi) and galena (Gn) from the Clogau mine, Dolgellau gold belt, North Wales, U.K. [Section...Creek, N.T., Australia: Henley et al. (1975), Suttsu mine, Japan: Shimizu et al. (1995), Nevskii, Russia:...reported from the same type-locality (Santa Catarina mine near Guanajuato, Mexico; see Earley 1950, Ramdohr...(1970) (Falun, Sweden), Shimizu et al. (1995) (Suttsu mine, Japan), and Yefimov et al. (1988) and Mozgova et |  | Liu, Haiming, Beaudoin, Georges, Makvandi, Sheida, Jackson, Simon E., Huang, Xiaowen (2021) Multivariate statistical analysis of trace element compositions of native gold from orogenic gold deposits: Implication for mineral exploration. Ore Geology Reviews, 131. 104061pp. doi:10.1016/j.oregeorev.2021.104061 | Journal (article/letter/editorial) | | orogenic gold de posits is dominantly found in quartz-carbonate veins as well as in biotiteor actinolite-altered...rocks. Most of the gold occurs as fine grains along quartz or sulfide boundaries and in fractures, and as...Canada Veine Superior Anhedral inclusions in quartz or veinlets filling in the fractures of pyrite...chalcopyrite Anhedral inclusions in quartz ± pyrite Disseminated inclusions in quartz; fine round grain Anhedral...tourmaline; isolated fine grain Anhedral inclusions in quartz or veinlets filling in the fractures of tourmaline; |  | | Journal (article/letter/editorial) | | Paleo-Asian Ocean in foldbelts of the Altai-Sayan region of Central Asia: geochemistry, biostratigraphy...mineralization of the Lega Dembi gold deposit. Adola gold field. Southern Ethiopia ............................ Tateishi. K. First report of sapphirine+quartz assemblage from southern India: implications for...Neoproterozoic rocks of the Negele area. Southern Ethiopia ...... Yokoyama. K .. (see Santosh. M.) ..... |  | Zhao, Kai, Yao, Huazhou, Wang, Jianxiong, Ghebretnsae, Ghebsha Fitwi, Xiang, Wenshuai, Xiong, Yi-Qu (2019) Genesis of the Koka Gold Deposit in Northwest Eritrea, NE Africa: Constraints from Fluid Inclusions and C–H–O–S Isotopes. Minerals, 9 (4) 201 doi:10.3390/min9040201 | Journal (article/letter/editorial) | | sphalerite–galena–gold–quartz vein; and (2) a second stage of pyrite–quartz veins. NaCl-aqueous inclusions...–H2 O inclusions occur in the quartz veins at Koka. The ore-bearing quartz veins formed at 268 ◦ C from...Volcanic-associated Massive Sulfide (VMS) type and quartz vein-hosted gold ± sulfide deposits and occurrences...study of deposit geology, fluid inclusions (FIs), quartz C–H–O isotopes, and the sulfide S isotope of the...structures as well as local macroscopic en-echelon quartz veins and tension gashes with a general trend of |  | | Journal (article/letter/editorial) | | fluid which later precipitated sulphides in the quartz ± carbonate veins. Keywords. South Purulia shear...sediment-hosted gold deposits such as Lega Dembi gold deposit, Southern Ethiopia, Um El Tuyor gold deposit, Egypt...and galena are present within the quartz ± carbonate veins. Quartz ± carbonate veins within the host...associated with refractory gold occurrences in the region. J. Earth Syst. Sci. (2019)128:233 Page 3 of...metamorphosed to quartzite, phyllite and muscovite quartz schist. The shear zone started developing at the |  | | Journal (article/letter/editorial) | | shear-belt in the East African Orogen of western Ethiopia A. Braathen a, T. Grenne a,*, M.G. Selassie b...Norway Geological Sur6ey of Ethiopia, P.O. Box 2302, Addis Ababa, Ethiopia Received 4 November 1999;...has been studied within a transect in western Ethiopia which covers a variety of metasedimentary and... Associated shortening of the arc and back-arc region led to crustal thickening and emplacement of synkinematic...Elsevier Science B.V. All rights reserved. Keywords: Ethiopia; Neoproterozoic; Suture zones; Structural geology; |  | | Journal (article/letter/editorial) | | auriferous, quartz-veined shear zone with features of an epithermal low-sulfidation gold system. The quartz-lode...quartz-lode and quartz-carbonate mineralization is characterized by open-space textures, typically with sharp-walled...rocks. Silicic alteration by cryptocrystalline quartz is abundant; potassic alteration is expressed by...pyrite and chalcopyrite occur in comb and cockade quartz. Gold occurs disseminated in the volcanic and subvolcanic...vapor-rich and liquid-rich fluid inclusions in quartz, quartz textures, and the presence of adularia and |  | Zhang, Liang, Groves, David I., Yang, Li-Qiang, Sun, Si-Chen, Weinberg, Roberto F., Wang, Jiu-Yi, Wu, Sheng-Gang, Gao, Lei, Yuan, Lan-Ling, Li, Rong-Hua (2020) Utilization of pre-existing competent and barren quartz veins as hosts to later orogenic gold ores at Huangjindong gold deposit, Jiangnan Orogen, southern China. Mineralium Deposita, 55 (2) 363-380 doi:10.1007/s00126-019-00904-5 | Journal (article/letter/editorial) | | Utilization of pre-existing competent and barren quartz veins as hosts to later orogenic gold ores at Huangjindong...hydrothermal alteration and quartz veins. Pre-existing barren and brittle quartz veins, which are controlled...earlier quartz veins and associated pre-existing breccias, with deposition of auriferous quartz-sulfide...hydrofractures and breccia matrices. Thus, competent barren quartz veins in fold/thrust belts may locally host superimposed...gold . Structural geometry . Pre-mineralization quartz veins . Huangjindong gold deposit . Jiangnan Orogen |  | | Journal (article/letter/editorial) | | gold resources mainly in structurally-controlled quartz±carbonate veins that are best classified as late...deposit. Today, Sukari is the single major producing mine in US the Eastern Desert but many other significant...aqueous-carbonic with most measured δ18O of mineralized quartz ranging from 8 ‰ to 15 ‰, δ13C for associated carbonate...associated with pressure cycling and multiple vein quartz precipitation. Keywords : Orogenic gold, Distribution...MANUSCRIPT 1. Introduction Gold has been produced from quartz veins in Neoproterozoic rocks and associated alluvial |  | | Journal (article/letter/editorial) | | Essakane, 20 = Kittilä, 21 = Meliadine, 22 = Lega Dembi, 23 = Fosterville, 24 = Sukhoi Log, 25 = La Lucette...elevated Sb and Hg contents suggest a hydrothermal quartz vein sulfide system in Cameroon. Banks et al. (2018)...aggregate or disseminated grains distributed in quartz veins (Fig. 4E). Native gold from different deposit...porphyry deposits which plot in the negative t1 region (Fig. 13B). The distribution of samples on the...(K-feldspar + muscovite + biotite + quartz), the phyllic assemblage (quartz + sericite + pyrite), and the argillic |  | | Journal (issue) | | Phenomenal geology + phenomenal team = phenomenal mine Khoemacau Delivering on expectations, planning the...interest you?” what it requires to deliver a new mine, the editor at the time asked. “Because I successfully...literally considering and busts and most my first mine visit recently, COVID-19. was to Mponeng – The only...throughout all these underground gold changes is the need mine. Travelling to be resilient and around 3 km down...to positive change. I may I’ve been on many, many mine visits be leaving Mining Review Africa, but I’m |  | | Report (issue) | | MAURITANIA MALI NIGER ERITREA CHAD Khartoum* SUDAN ETHIOPIA UG Kampal RWANDA~:c-J:::;.:;.;:;'---.. Kigali...37 Egypt . . . . . . . . . . . . . . . . . . 41 Ethiopia, Djibouti, and Eritrea . . . 47 Gabon . . . ....of diversified experience in mineral exploration, mine design, development, and operations, as well as...for graphite; Morocco for barite;. Namibia for quartz crystal; South Africa for andalusite, antimony...:ifiecl) Cobalt, Alumi- Cbromite Ccment Dum mine, Co CODtent (tooa) Algeria 6,400 Angola '250 |  | | Book (edition) | | the mineral industry and human consequences 11.6.1 Mine waste catastrophe 11.6.2 Mineral process plant failure...Clinopyroxene Galena Microcline Pyrrhotite Pyrite Quartz Sericite/sericitization Sphalerite Metals/semimetals/nonmetals...system had been unearthed along the “Awas River” in Ethiopia following the East African Rift System. “Millennium...fuel. The common rock-forming minerals (RFM) are quartz (SiO2), orthoclase feldspar (KAlSi3O8), plagioclase...sulfur (S), graphite (C) Oxide and hydroxide Quartz (SiO2), hematite (Fe2O3), cassiterite (SnO2), chromite |
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