 | Schneider, Jens, Boni, Maria, Laukamp, Carsten, Bechstädt, Thilo, Petzel, Volker (2008) Willemite (Zn2SiO4) as a possible Rb–Sr geochronometer for dating nonsulfide Zn–Pb 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 – 167 www.elsevier.com/locate/oregeorev Willemite (Zn2SiO4) as a possible Rb–Sr geochronometer for...mineralization: Examples from the Otavi Mountainland (Namibia) Jens Schneider a,⁎, 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 hypogene–hydrothermal 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,† 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...Friesemberg Tigerschlucht Olifantsfontein Abenab pipe Okorundu pipe Abenab West Harasib 3 Wolkenhauben Berg Aukas |  | | 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 |  | | 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 (article/letter/editorial) | | mineralization in the Otavi Mountain Land, Northern Namibia—a review and regional interpretation A.F. Kamona...Günzel 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...(Pb–Cu–Zn–Ge), Kombat (Cu–Pb–Zn), Berg Aukas (Zn–Pb–V), Abenab West (Pb–Zn–V) all occur in Otavi Group dolostones...carbonate-hosted Pb–Zn deposits in the Abenab Subgroup at Berg Aukas and Abenab is not well constrained, but the |  | | Journal (issue) | | 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...for Vitec, our contact for our visit to the Tsumeb Mine. It has to be said that some of that time was spent...Figure 1 Headframe of the De Wet Shaft, Tsumeb 1 Namibia Handbook (Footprint) p324 -7- SMLS Journal 176...and diversity of mineral resources throughout Namibia. Although widely ranging and distributed, a large |  | 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-manganese–rich 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) | | 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 |  | Silin, Ivan, Hahn, Klaus, Gürsel, Devrim, Kremer, Dario, Gronen, Lars, Stopić, Srećko, 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 |  | | Journal (article/letter/editorial) | | was F. H. Pough (1) who first pointedout that willemite (Zn,iO4) is a mineral most characteristic of...describingwillemite 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 |  | | Book | | Mountainland The Central Northern to Northwest Region including Damaraland The Central Namib Desertand...s Onganja Mine and Surrounding Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits...__ Republic of Namibia The President State House W°Ntdhoek FOREWORD Namibia is endowed with an...from near and far. Fine mineral specimen from Namibia are displayed in all the famous natural science |  | | 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 |  | | Report (chapter) | | southern margin of the Congo Craton, northern Namibia: facies, palaeogeography and hydrocarbon perspective...Ghaub Formation diamictite interval in northern Namibia and the major environmental change in the aftermath...peri-Gondwanan areas apart from the formerly glaciated region of northern Africa. In the Palaeozoic post-glacial...the late Cryogenian Ghaub glaciation of northern Namibia, a classical field location for research on this...Kennedy (2007). Geological overview In northern Namibia continental rifting occurred in the Late Neoproterozoic |  | | 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 |  | Mondillo, Nicola, Accardo, Mariafrancesca, Boni, Maria, Boyce, Adrian, Herrington, Richard, Rumsey, Mike, Wilkinson, Clara (2020) New insights into the genesis of willemite (Zn2SiO4) from zinc nonsulfide deposits, through trace elements and oxygen isotope geochemistry. Ore Geology Reviews, 118. 103307 doi:10.1016/j.oregeorev.2019.103307 | Journal (article/letter/editorial) | | Journal Pre-proofs New insights into the genesis of willemite (Zn2SiO4) from zinc nonsulfide deposits, through... Wilkinson, New insights into the genesis of willemite (Zn2SiO4) from zinc nonsulfide deposits, through...Elsevier B.V. 1 New insights into the genesis of willemite (Zn2SiO4) from zinc 2 nonsulfide deposits, through...East Kilbride Scotland 1 19 Abstract 20 Willemite is a common mineral mainly occurring in the so-called...comprehensive compilation of 23 geochemical data on willemite is currently lacking, the aim of this study is |  | | 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 |  | | Journal (issue) | | Minerals of the Kaokoveld District, Kunene Region, Namibia .............................................1 cm, from the Kaokoveld District, Kunene Region, Namibia. Irv Brown specimen; Jeff Scovil photo. See...the best vesuvianite specimens from the Jeffrey mine in Quebec. In this issue we present a review of...Herodsfoot Mine Work Readers who enjoyed Roy Starkey's superb article on the famous Herodsfoot mine in Cornwall...to the old engine house at the North Herodsfoot mine is being cleared of hundreds of tons of accumulated |  | | 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 |  | | Journal (issue) | | can:ie info~ consid_e~able praise. The Florence Mine was one of the best thought out and most interesting...Lee from SMLS, delayed his fishing holiday to Namibia for a day (yes - FISHING!!) in order to give a...his classic "half-hour" lectures on the Florence Mine and West Cumbrian Minerals, which was authoritative...magnificent gemmy dioptase on calcite from the Tsumeb Mine, Namibia. Many thanks to SMLS members, Show dealers,...hot it might be collecting specimens on an exposed mine dump at midday. Wrth luggage collected and customs |  | Choulet, F., Buatier, M., Barbanson, L., Guégan, 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...describingwillemite from Broken Hill, Northern Rhodesia and Abenab West, South West Africa, clearly indicatea secondarymode...oxidizingsolutionswere responsible for the developmentof willemite,throughconrtibutoryfactorswere thoughtto be somewhat |  | 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...–0.1 to +0.4‰). 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, Gürsel, 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 350–400 |  | 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 |  | | Catalog/List | | Masses with polished surface • from the Patapsco Mine. About ax 2¼", $4.00. CASSITERITE. A tin oxide...6", $2.50; 4 x 6", New Jersey. Cleavages with willemite, $3.00; 3i X 6:f", $3.60; 6i X 66", $4.00; iarnet...xis coating rock, 2 x 2", $.35; 2 x 3", $.46. Abenab Mine, Southwest Africa. Xled and massive on and in... · coSALITE. A sulfide of lead and bismuth. Abenab Mine, Southwest Africa. Partly British Columbia. Xline...in grayish-white masses with frankli nite and willemite, about 3 x 4", $1.35; 311 X 5", $4.66. HEMATITE |
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