 | Schneider, Jens, Boni, Maria, Laukamp, Carsten, BechstƤdt, Thilo, Petzel, Volker (2008) Willemite (Zn2SiO4) as a possible RbāSr geochronometer for dating nonsulfide ZnāPb mineralization: Examples from the Otavi Mountainland (Namibia) Ore Geology Reviews, 33 (2) 152-167 doi:10.1016/j.oregeorev.2006.05.012 | Journal (article/letter/editorial) | | 152 ā 167 www.elsevier.com/locate/oregeorev Willemite (Zn2SiO4) as a possible RbāSr geochronometer for...mineralization: Examples from the Otavi Mountainland (Namibia) Jens Schneider a,ā, Maria Boni b,c , Carsten Laukamp...Germany d Geological Survey of Namibia, 1 Aviation Road, Windhoek, Namibia Received 12 September 2005; accepted...online 6 August 2007 Abstract The zinc silicate willemite (Zn2SiO4) is the main carrier of zinc in a number...of hypogeneāhydrothermal origin. The timing of willemite mineralization in these deposits is only poorly |  | Boni, M., Terracciano, R., Evans, N. J., Laukamp, C., Schneider, J., Bechstadt, T. (2007) Genesis of Vanadium Ores in the Otavi Mountainland, Namibia. Economic Geology, 102 (3) 441-469 doi:10.2113/gsecongeo.102.3.441 | Journal (article/letter/editorial) | | Genesis of Vanadium Ores in the Otavi Mountainland, Namibia MARIA BONI,ā Dipartimento di Scienze della Terra...mottramite, and vanadinite) in the Otavi Mountainland, Namibia, once were considered the greatest vanadium deposits...occurs in the areas surrounding primary sphalerite-willemite orebodies (Berg Aukas type). The V deposits the...Belgium. 0361-0128/07/3663/441-29 Mountainland, Namibia. Mining for vanadium, following the exploitation...Auros Fm Auros Fm Auros Fm Gauss Fm Karavatu Tsumeb West Tƶnessen Baltika Gross Otavi Uris Uitsab pit Friesemberg |  | | Journal (article/letter/editorial) | | mineralization in the Otavi Mountain Land, Northern Namibiaāa review and regional interpretation A.F. Kamona...GĆ¼nzel b a b University of Namibia, Private Bag 13301, Windhoek, Namibia Ongopolo Mining Ltd., Main Street...Street, P.O. Box 40, Tsumeb, Namibia Received 16 May 2004; accepted 10 April 2006 Available online 4...(PbāCuāZnāGe), Kombat (CuāPbāZn), Berg Aukas (ZnāPbāV), Abenab West (PbāZnāV) all occur in Otavi Group dolostones...carbonate-hosted PbāZn deposits in the Abenab Subgroup at Berg Aukas and Abenab is not well constrained, but the |  | | Report (issue) | | MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY NAMIBIA 1991 Open File Report l\ffi.S 31 2 Abstract Germanium...epigenetic ore bodies of Tsumeb, Kombat and Abenab. The Tsumeb Mine produced germanium in 1922 and from 1950...2. Occurrences 2.1. Germanium 2.1.1. The Tsumeb Mine 2.1.2. Other occurrences 2.2. Gallium 3. References...and gallium, occur in Namibia. These are known as the Tsumeb, Kombat and Abenab Mines (Fig. 1). 2. Occurrences...The Tsumeb Mine The only mine in Namibia that has ever produced germanium is the Tsumeb Mine. A comprehensive |  | | Journal (issue) | | Actinolite from Namibia by Justin Zzyzx ............................................pg. 15 Abenab Mine by Ernst................................pg. 31 Three Aloes Mine by Ernst Schnaitmann ............................................................pg. 47 Otjozondu Mine by Ernst Schnaitmann .............................we bring you eleven articles about locations in Namibia that do not receive much publicity. It is easy...legendary deposits such as Tsumeb, the Brandberg region and the Erongo Mountains. Alpine clefts, huge soda |  | | Journal (issue) | | ME90EX Colin Brough 1 William Allen Lane LINDFIELD West Sussex 01795 521174 0208 654 1298 01795 521174...precious stone. Opalbanya is the name of the original mine location. Possibly Magyar, ancient Hungarian. These...are fine Some aren't unpacked yet -a few are now mine! But rocks in the garage and more in the shed, Were...he's at home. Cumbria, Scotland and then the South West And exchanges rock gossip with gusto and zest. When...for Vitec, our contact for our visit to the Tsumeb Mine. It has to be said that some of that time was spent |  | Silin, Ivan, Hahn, Klaus, GĆ¼rsel, Devrim, Kremer, Dario, Gronen, Lars, StopiÄ, SreÄko, Friedrich, Bernd, Wotruba, Hermann (2020) Mineral Processing and Metallurgical Treatment of Lead Vanadate Ores. Minerals, 10 (2) 197 doi:10.3390/min10020197 | Journal (article/letter/editorial) | | 0.084 13.6 13.60 South Africa Mapochs Mine Rhovan Mine 1.5 0.52 1.5 1.06 1.60 Generally, VTM...Russia and the Chinese deposit in the Panzhihua region contain resources of 13.6 and 10.4 million metric...Commonly such deposits contain cerussite, anglesite, willemite, and smithsonite, which are usually profitably...(PO4 )(OH) Pseudomalachite Cu5 (PO4 )2 (OH)4 Willemite Zn2 SiO4 Silicate - Hemimorphite Zn4 Si2 O7...and mottramite (along with the precipitation of willemite, calcite, and dolomite). In many instances, the |  | Hitzman, M. W., Reynolds, N. A., Sangster, D. F., Allen, C. R., Carman, C. E. (2003) Classification, Genesis, and Exploration Guides for Nonsulfide Zinc Deposits. Economic Geology, 98 (4) 685-714 doi:10.2113/gsecongeo.98.4.685 | Journal (article/letter/editorial) | | bodies. The structurally controlled bodies contain willemite and variable amounts of sphalerite, are hematitic...three categories: calamine-dominant deposits, willemite-dominant deposits, and hydrated zinc silicate...deposits consisting of veins and irregular pipes of willemite-(sphalerite-hematite-manganeseārich minerals)...Zn, Zambia; 28 = Skorpion, Namibia; 29 = Berg Aukas and Abendab, Namibia; 30 = Padaeng (Mae Sot), Thailand;... In extremely arid climates, such as those in Namibia (Tsumeb deposit: Lombaard et al., 1986; Hughes |  | | Journal (article/letter/editorial) | | was F. H. Pough (1) who first pointedout that willemite (Zn,iO4) is a mineral most characteristic of...from Broken Hill, Northern Rhodesia and Abenab West, South West Africa, clearly indicatea secondarymode...oxidizingsolutionswere responsible for the developmentof willemite,throughconrtibutoryfactorswere thoughtto be somewhat...interestis that for the reaction. Hemimorphite--> Willemite q- H20 whichis reproducedin Figure 1. The dehydrationcurve...other willemite occurrences in the Otavi Mountains of South West Africa. At the Berg Aukas Mine exp |  | | Journal (article/letter/editorial) | | MINER.GES. 148 (2003) THE OTAVI MOUNTAIN LAND IN NAMIBIA: TSUMEB, GERMANIUM AND SNOWBALL EARTH by Frank...carbonate successions in the Otavi Mountain Land, Namibia, host a large number of polymetallic (Cu-Pb-Zn)...structure. Massive Cu ore at the Khusib Springs mine is composed of tennantite, enargite, galena and...jungproterozoischen Karbonatabfolgen des Otavi Berglandes (Namibia) sind zahlreiche polymetallische (Cu-Pb-Zn) Sulfidvorkommen...this is more than the name of a small town in Namibia and a polymetallic copper deposit: Tsumeb is renown |  | | Book | | The EarlyGermanGeologistsand Entrepreneursin South West Africa The People- Mineralogists,Geologistsand Collectors...Mountainland The Central Northern to Northwest Region including Damaraland The Central Namib Desertand...Nauchas-Gamsberg-Hakos Area West and South of Rehoboth The Central and South-CentralDeposits Onganja Mine and Surrounding...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits |  | | Journal (article/letter/editorial) | | hydrozincite), Zn silicates (hemimorphite, more rarely willemite or Zn-rich clays), and even more rarely true Zn...September 2003, the Skorpion nonsulfide Zn mine in southern Namibia started its production with the first...directly date hydrothermal willemite formation in the Otavi Mountainland, Namibia. Their preliminary results...results from Berg Aukas and Abenab West deposit suggest hypogene Zn silicate formation from precursor sulfides...Belgium. Their study shows that the genesis of the willemite orebody at Kelmis (also known as La Calamine or |  | | Book | | REPUBLIC OF NAMIBIA - MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY THE MINERAL RESOURCES OF NAMIBIA FIRST...ENERGY Of the several hundred minerals present in Namibia, around sixty have been exploited. some, such as...base metals and industrial minerals have helped Namibia rank amongst the top five mining countries in Africa...terms of production and reserves. In this context, Namibia is a major producer of copper, lead, zinc, cadmium...unpublished. It is evident that mineral exploration in Namibia, as elsewhere. has changed from serendipitous discoveries |  | | Journal (issue) | | 75236 Uppsala, Sweden Water Science GROSBOIS Region III, Pennsylvania 19103, USA Consortium, Inc...Quantitative Hydrology DoNnALD Jor BENSON Nuclear Davip Region III, Hydrogeology STEPHEN H. Stow Oak Ridge...climatic features of Bangladesh vary from region to region and season to season. During the monsoon...to this region) to more than 2030 mm in the south-eastern (one study area belongs to this region) and north-eastern...shales and claystones in the geosynclinal foredeep region (east and southeastern part of Bangladesh) contain |  | Choulet, F., Buatier, M., Barbanson, L., GuĆ©gan, R., Ennaciri, A. (2016) Zinc-rich clays in supergene non-sulfide zinc deposits. Mineralium Deposita, 51 (4) 467-490 doi:10.1007/s00126-015-0618-8 | Journal (article/letter/editorial) | | white to ocher granular clays are associated with willemite (Zn2SiO4), while red clays fill karst-related...minerals with less than 20 % of smectite layers. Willemite is partially dissolved and is surrounded by authigenic...support the following process: (i) dissolution of willemite, leading to release of Si and Zn, (ii) interaction...nonsulfide deposits with successful applications in Namibia, Peru, and Morocco. Supergene non-sulfide zinc...hydrated carbonates (hydrozincite), silicates (willemite), hydrated silicates (hemimorphite), and various |  | | Journal (article/letter/editorial) | | was F. H. Pough (1) who first pointedout that willemite (Zn,iO4) is a mineral most characteristic of...from Broken Hill, Northern Rhodesia and Abenab West, South West Africa, clearly indicatea secondarymode...oxidizingsolutionswere responsible for the developmentof willemite,throughconrtibutoryfactorswere thoughtto be somewhat |  | | Journal (article/letter/editorial) | | W. MULLER Abstract The willemite ore bodies which comprisethe Beltana Mine are associatedwith intrusive...sedimentationceasedin the Adelaide Geosynclinein the region of the Beltana Mine, and an erosionsurfacehas existed from...successive leachings of the depositsupgradedthe willemite and formed magnificentcolloformspecimens. This...formed pulverulent willemite and hematite mass. Recent chemical attack on the willemite has formed coarse...copperprospectsnow known as the Ajax Mine, in the immediatevicinity of small,undisturbed willemite occurrences situated |  | Mondillo, Nicola, Wilkinson, Jamie J., Boni, Maria, Weiss, Dominik J., Mathur, Ryan (2018) A global assessment of Zn isotope fractionation in secondary Zn minerals from sulfide and non-sulfide ore deposits and model for fractionation control. Chemical Geology, 500. 182-193 doi:10.1016/j.chemgeo.2018.09.033 | Journal (article/letter/editorial) | | from non-sulfide zinc mineral separates IP (willemite - Zn2SiO4, smithsonite - ZnCO3, hemimorphite -...several Zn deposits in Ireland, Belgium, Poland, Namibia, Peru, Yemen and Zambia. The data are compared...likely extent of any fractionations. We find that willemite has the greatest compositional variability, with...ā0.1 to +0.4ā°). Most of the data observed on willemite, hemimorphite and hydrozincite can be explained...were measured on 28 secondary zinc minerals (willemite - PT Zn2SiO4, smithsonite - ZnCO3, hemimorphite |  | Silin, Ivan, GĆ¼rsel, Devrim, Kremer, Dario, Hahn, Klaus M., Wotruba, Hermann (2020) Production of Vanadium Concentrate from a Small-Scale Lead Vanadate Deposit by Gravity Concentration: A Pilot Plant Study. Minerals, 10 (11) 957 doi:10.3390/min10110957 | Journal (article/letter/editorial) | | concentrates, located in Namibia (gravity separation and flotation plants in Abenab West Mine and Berg Aukas)...accumulated from the local smelters in Berg Aukas (Namibia) and Kabwe (Zambia) and disposed at the local polluted...Argentina, USA, Mexico, Angola, South Africa, Namibia [29,30]. The use of lead vanadate minerals as a...provides opportunities for more jobs in the operating region [32,33]. At present, there is no global market...is introduced in Figure 1. The stockpiled run-of-mine ore with an average feed particle size of 350ā400 |  | Boni, Maria, Terracciano, Rosario, Balassone, Giuseppina, Gleeson, Sarah A., Matthews, Alexander (2011) The carbonate-hosted willemite prospects of the Zambezi Metamorphic Belt (Zambia) Mineralium Deposita, 46 (7) 707-729 doi:10.1007/s00126-011-0338-7 | Journal (article/letter/editorial) | | 1007/s00126-011-0338-7 ARTICLE The carbonate-hosted willemite prospects of the Zambezi Metamorphic Belt (Zambia)...2011 # Springer-Verlag 2011 Abstract Zambian willemite (Zn2SiO4) deposits occur in the metasedimentary...located around Kabwe and contain both sulphides and willemite in dolomites of low metamorphic grade. The Star...Arc and the Zambezi Belt). In both prospects, willemite replaces the marbles and is found along joints...germanium and cadmium have been detected within the willemite ore, and lead or zinc sulphides are scarce or |  | | Journal (article/letter/editorial) | | version: vanadates in the Otavi Mountainland (Namibia) 42 8. Discussion and conclusions 43 Acknowledgements...uneconomic. The ED occurrence of supergene willemite is a still a debated subject. Supergene nonsulfide...deposits like the famous, silicate-hosted Skorpion (Namibia) are mineralogically challenging, but their processing...advanced exploitation stage include Skorpion (Namibia), Lan Ping (China), Angouran and Mehdiabad (Iran)...anhydrous zinc silicates and oxides, such as PT willemite (Zn2SiO4), zincite (ZnO), franklinite (ZnFe2O4) |  | | Journal (article/letter/editorial) | | br/dnpm/sumarios/zinco-sumario-mineral-2014). The Vazante mine has been in operation since the 1960ās, when it...(Zn2SiO4) deposit in the world and the largest zinc mine in Brazil, with estimated total resources of 40...as Beltana, Star Zinc, Kabwe, Berg Aukas and Abenab West, the studies were carried out mostly on the mineralized...eastern portion of the Tocantins Province and at the west border of the SĆ£o Francisco craton (SFC), and extends...thrust slabs that converged to the east against the west portion of the SĆ£o Francisco-Congo platform (Valeriano |  | | Journal (article/letter/editorial) | | The chemistry of magmatic ore fluids from South West England David Banksa, Bruce Yardleyb School of Earth...obvious importance of Cu as a mobile ore metal in the region. Chloride concentrations are variable, with values...rocks), direct atmospheric leaching of the run of the mine (5ROM) ore with sulphuric acid will not be economically...melting of supracrustals (RoĢssing alaskites, Namibia), or from extreme fractional crystallization of...surficial deposits like calcretes (Langer Heinrich, Namibia). In the Olympic Dam IOCG deposit, Southern Australia |  | | Journal (article/letter/editorial) | | has been more usefully applied to exploration and mine development in the Witwaterstrand basin than the...suggested that the Styudyanka deposits in the Baikal region of Russia are Archean in age, and Bushinsky (1969)...indicated relative to mean Ī“97/95MoSW. The hatched region represents the Ā±0.5ā° uncertainty associated with...recognized almost simultaneously in the Athabasca basin region (Canada) and in the Pine Creek geosyncline (Australia)...is rather difficult. They frequently contain a willemite (Zn2SiO4) or a willemitezincite (ZnO) assemblage |  | Verhaert, MichĆØle, Bernard, Alain, Dekoninck, Augustin, Lafforgue, Ludovic, Saddiqi, Omar, Yans, Johan (2017) Mineralogical and geochemical characterization of supergene CuāPbāZnāV ores in the Oriental High Atlas, Morocco. Mineralium Deposita, 52 (7) 1049-1068 doi:10.1007/s00126-017-0753-5 | Journal (article/letter/editorial) | | edge of the Oriental High Atlas (Fig. 1). This region is characterized by the alternation of high Jurassic...mining district. (b) Geology map of the Bou Arfa region showing the location of Jbel Klakh and Jbel Haouanit...Wadjinny (1998), the exploitation of the Jbel Haouanit mine, until its closure in 1954, yielded 150,000 tons...at Jbel Haouanit (2.5 km away from the principal mine) for Cu and V ores (Fig. 1). In the Bou Arfa area...excavations located 2.5 km away from the principal mine also exhibit mineralized veins hosted by Jurassic |
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