 | | Report (issue) | | MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY NAMIBIA I 1990 Open File Report MRS 05 2 Abstract A...wide variety of semi-precious stones occur in Namibia, namely amazonite, the beryl varieties, chrysocolla...cordierite, dioptase, dumortierite, pyrophyllite, the quartz varieties the garnet varieties, milarite, including...rose quartz and smoky quartz are currently the most important semi-precious stones found in Namibia. The...turquoise. An extensive deposit of amethyst occurs in quartz-calcite veins in rocks of the Swakop Group. Druses |  | | Report (issue) | | SURVEY NAMIBIA 1990 Open File Report MRS 12 2 Abstract Niobium-tantalum mineralisation in Namibia occurs...by-products of Tin-mining operations in central Namibia (Uis, Nainais, De Rust). Prominent niobium-tantalum...pegmatites occur in the Tantalite Valley in southern Namibia and have been mined for a long time on a small...2.2.3.7 Pistelwitz pegmatites 2.2.4 Sandamap - Erongo pegmatite belt 2.2.4.1 Gossow pegmatites 2.2.4...4.8 Davib South 2.2.4.9 Brabant (van der Made, Erongo Schlucht) pegmatite 2.2.4.10 Okawayo pegmatites |  | | Book | | Twyfelfontein 7 AiAiba / farm Anibib 136 8 Grosse Spitzkoppe, Erongo 9 , .,/, loringa tree ...station Garub near Aus Nature conservation, Erongo 16 Welwitschia, Goboboseb Mountains 17 ....Mineralogists,Geologistsand Collectors 21 27 29 37 Minerallocalities The North TsumebSpecial The Otavi...Northwest Region including Damaraland The Central Namib Desertand Escarpment The Spitzkoppen The Erongo Mountains...s Onganja Mine and Surrounding Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and |  | | Journal (article/letter/editorial) | | gemmy, intense purple apatites from this pegmatite mine have made Pulsifer the premier locality for fluorapatite...variety of albite, calcite, epidote, muscovite, quartz, titanite, chabazite, and stilbite. Another important...caught my breath and hoped it wasnāt a shard of quartz. Carefully, I used just my index finger to push...coated and uncoated with chlorite and a few small quartz specimens, but no more fabulous apatites. Of course...Lake Boga, Swan Hill Rural City, Victoria Aberfoyle mine, Rossarden district, Tasmania Complex metamorphosed |  | | Journal (article/letter/editorial) | | The basin evolution of the Panafrican belts in Namibia was controlled by major rift systems comprising...Damara, Kaoko and Gariep Belts cover almost half of Namibia and display a continuous 450 million years of earth...setting The study area, situated to the southwest of Karibib (Figure 2), covers portions of the Swakop and Khomas...lens, 200 m thick and 3500 m long, in the western Otjua Dome. The beds, 1 to 3 m thick, contain deformed...arkosic sandstone layers are also present in the Otjua Dome, while small lenses of biotite schist occur |  | | Book | | .,,., ..,,.... w + ..... . Ā·. .... . - Namibia Zauberwelt edler Steine und Kristalle ooa Dieses...Erdgeschichte 8 Zur Geschichte des Bergbaus in Namibia 17 Der Brandberg und die Mineralfunde in seiner...blaue Wunder vom Erongo - Auf Aquamarin-Jagd im Innern Namibias 72 Miarolen im Erongo-Granit- ein Eldorado...Riesenquarze von Otjua 110 Auf Turmalinsuche in Namibia Die Demantoide von Tubussis in Zentral-Namibia 112 116...Zeolithe vom GrootbergpaĆ in Namibia Kamphaugit-(Y) von der Rƶssing-Mine 120 124 126 136 Das Gahnit-Vorkommen |  | | Catalog/List | | ānormalā habit, often in conjunction with euhedral Quartz crystals. The potential for new discoveries and...sideways as well as up. This form is sometimes seen in Quartz, but very rarely in Tourmaline. The rough exterior...and is accompanied by a partially euhedral Smoky Quartz crystal. The Phenakite, measuring 0.9 inches (2...first offered for sale. 73007 TOURMALINE Minh Tien Mine, Luc Yen, Yenbai Province, Vietnam A classic Vietnamese...online, visit HA.com/6150 73008 ELBAITE Minh Tien Mine, Luc Yen, Yenbai Province, Vietnam This unusual |  | | Journal (article/letter/editorial) | | Pan-AfricanTungstenSkarnMineralization at the Otjua Prospect,Central Namibia N. M. STEVEN* Departmentof Geological...RhodesUniversity,Grahamstown 6140,SouthAfrica Abstract The Otjua tungstenprospect,the largestscheelite-fluorite ...metric tons at 0.53 wt % WOo and 8 wt % CaF2) in Namibia, is developedwithin Late ProterozoicOkawayoFormationcalcite...-rockdateof 478 _ 4 Ma). The contactbetweenthe Otjua leucogranite(71.7-73.4 wt % SiO2;5.78 wt % K20;Rb/Sr=...abnormallyheavy oxygen isotopecomposition of the Otjua pluton. Skarnformationwasundoubtedlyrelatedto the |  | | Journal (issue) | | the Merelani mine, located on the slopes of the Lelatema Mountains in the Manyara Region, about 70 km...cover: Top left: Euclase, 2.2 cm, from the La Marina mine, Colombia. Top right: Topaz, 8.4 cm, from Ouro Preto...left: Phosphophyllite, 2 cm, from the Unificada mine, Potosi, Bolivia. Bottom right: Grossular, 3.5 cm...of the town of Brandberg, Daures Constituency, Erongo Region, Namibia. The occurrence was discovered in...Fluorapatite on elbaite, 5.5 cm, from the Alto da Cabeca mine, Parelhas, Rio Grande do Norte, Brazil. Will Johnson |  | | 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 (article/letter/editorial) | | poorexposure andthe complicated tectonichistoryof the region,the ageof the mica-defined fabriccan rarelybe determined...moreof tourmaline; BatesandJackson, 1987)andzonesof Namibia (Stevenet al., 1994) hasled to the identificationof...morphology of TOURMALINITE MINERALIZATION, KUISEBFM.,NAMIBIA 120 _ ā¢ 140 160 1099 180 200 q. -t. ANGOLA...Fig.4) TOURMALINITEMINERALIZATION, KUISEBFM., NAMIBIA 15ĆøE I km 16OE 50 I NORTHERN + 1101 ZONE...21ĆøS Area of Fig. 4 Otjua Tungsten AINAISOHERO TIN 21os Prospect BELT Otjua o+_ā¢ani Ohere OosJ |  | | Journal (article/letter/editorial) | | study from the Pan-African Damara granitoids of Namibia Received: 24 April 1995/Accepted: 11 December...granitoids from the Pan-African Damara mobile belt (Namibia), many of the leucogranites and Salem-type granitoids...geological map of the Pan-African Damara belt of Namibia showing the distribution of the major granitoid...6 Salem Goas granite, 7 Salem Onanis granite, 8 Otjua red granite, 9 Swakopmund Salem granite, 10 Goanikontes...from the Pan-African Damara orogen of Central Namibia, and in a new approach, we attempt to model the |  | | Journal (article/letter/editorial) | | ASPECTS OF THE GENESIS AND SEQUENCE OF THE KARIBIB SOUTH WEST CRYSTALLIZATION PEGMATITES, AFRICA...Conclusions concerningthe crystallizationsequence of the Karibib pegmatites ......................................on of pegrnatites ... 1079 Implicationsof the Karibib investigation............................. Towardsa...lithium- and beryllium-bearingpegmatites of the Karibib area have been studied in detail with regard to...economically mineralizedpegmatitesin the vicinity of Karibib, South West Africa. Thesebodiesconstitute one of |  | | Journal (article/letter/editorial) | | wollastonite Ā± quartz Ā± scheelite; stage II, garnet-vesuvianite-magnetite Ā± scheelite Ā± apatite Ā± quartz; stage...stage III, magnetite-amphibole-epidote-fluorite-quartz Ā± chlorite Ā± garnet Ā± vesuvianite Ā± scheelite Ā± carbonate...clinopyroxene; and stage IV, hematite Ā± fluorite Ā± calcite Ā± quartz. Stages I and II mineral assemblages represent...at Kara is by open cut and operated by Tasmania Mine NL Limited. Mining has concentrated on the Kara...Conglomerate is massive and poorly bedded, with quartz and rounded to subrounded quartzite pebbles and |  | | Catalog/List | | it collected when the Tsumeb Mine (as well as other mines of the region) were still in production in...climbing soon brought him into contact with the quartz crystals that were found on the mountain slopes...engineering work took him to the Tsumeb Mine in Namibia. This mine is renowned for producing what are arguably...desert-like "Sperrgebiet" area of the southern coast of Namibia, with its fabulous wealth of gem diamonds. One...Ianās interest stems from the family trips to Namibia, including the mines of Tsumeb. He worked with |  | | Catalog/List | | TN. 45 Ā£12 00 NATIVE SILVER with COPPER, Central Mine, Keweenaw Co . Michigan, USA. Growths of native...<4mm on milky quartz/grey schistose matrix. R.MI. 77 Ā£12.00 NATIVE GOLD, Homestake Mine, Lead,South Dakota...Dakota, USA. Flecks of native gold <4mm with milky quartz on black schistose matrix. R.MI. ; 9 Ā£1200 NATIVE...<4mm on milky quartz/grey schistose matrix. R.MI. ' 6 Ā£12 00 NATIVE GOLD, Homestake Mine, Lead,South...with milky quartz on black schistose matrix. R.ML : 81 ā Ā£12.00 NATIVE GOLD, Homestake Mine, Lead,South |  | | Journal (article/letter/editorial) | | diminishing of oreforming ļ¬uids, post-depositional barren quartz and calcite veins were formed. Ā© 2016 Elsevier...the TavÅanlı Zone and is composed of quartz-mica schist, quartz-calc schist and chlorite schist (Okay...In the Kocasu Formation, mineral assemblages of quartz + phengite + jadeite + chlorotoid + lawsonite +...glaucophane and muscovite + biotite + chlorite + quartz + albite have been determined, and PāT conditions...rounded/elliptical shaped maļ¬c microgranular enclaves (MME) of quartz monzodiorite/monzogabbro composition. The pluton |  | Alaminia, Zohreh, Mehrabi, Behzad, Razavi, Seyed Mohammad Hossein, Tecce, Francesca (2020) Mineral chemistry, petrogenesis and evolution of the Ghorveh-Seranjic skarn, Northern Sanandaj Sirjan Zone, Iran. Mineralogy and Petrology, 114 (1) 15-38 doi:10.1007/s00710-019-00688-6 | Journal (article/letter/editorial) | | recognized; stage I, clinopyroxene+garnetĀ±vesuvianiteĀ±quartzĀ±calciteĀ±scheeliteĀ± pyrrhotite; stage II, garnet+...pidote+chloriteĀ±quartz Ā±calciteĀ±pyrrhotiteĀ±pyriteĀ±chalcopyrite and stage IV, quartz+calciteĀ±amphibol...sigmoid-shape, NW-SE extending trend, with granite to quartz-monzogranite composition. It contains fine- to...leucogranite aplitepegmatite dikes (Fig. 2b) and quartz veins, which have a radial relationship with the...patterns. d Composition changes map in garnet within quartz-garnet and garnet-vesuvianite-clinopyroxene zones |  | | Journal (issue) | | Lab Notes ā¢ Bromellite ā¢ Charoite inclusions in a quartz-feldspar rock ā¢ Altered vs. natural inclusions...News International ā¢ Australiaās Ellendale diamond mine opens ā¢ Aquamarine and spessartine from Tanzania...Congo ā¢ Jeremejevite from the Erongo Mountains, Namibia ā¢ New morganite mine in Madagascar ā¢ Namibian gem...encountered in Namibia ā¢ Plastic and steel pearl imitations ā¢ Gem cutting factories in Namibia ā¢ Conference...diamonds shown here are from Canadaās Ekati Diamond Mineā¢, which started production in 1998. The necklace |  | | Journal (article/letter/editorial) | | is the well-known pyrite āsunā from the Ziegler mine, Randolph County, Illinois. This 7.4-cm specimen...provenance, and perhaps even polesā of the Cochran mine, Georgia; and the magnificent and Geography āwhoāāthose...Swakopmund, Namibia. The 14,100-kilogram group of quartz crystals is from the Otjua mine, Namibia. Tony Kampf...Kampf photo. Figure 3 (above). Giant quartz crystals are found in Brazil, such as these oil-drum-sized...Gerais, Brazil. Also included must be the huge quartz crystals from Brazil, Russia, Switzerland, and |  | | Journal (issue) | | 5424087. Bibliotecaris. Rik TAMBUYSER, Jan Samijnlaan 37, B-2100 Deurne. Tel 03 3250393 Determinatiedienst... Aanwinsten voor de bibliotheek Rik Dillen Namibia, Zauberwelt edler Steine und Kristalle Steffen... Spitskoppe, Erongo, Otjua, Tubussis, Grootbergpas, Okorusu mine, Usakos, Rƶssing mine enzovoort. Het...und Rauchquarzfunde aus den Goboboseb-Bergen in Namibia 76-79 Die gZi-Steine aus dem Himalaya 80 Falsche...mineral collecting 4-5 Mineral news 7-37 Penberthy Croft mine, St. Hilary, Cornwall, England * UK J |  | | Journal (issue) | | .. 37 Mozambique ............................................................................. 37 Myanmar............................................. 38 Namibia .................................................Ashok Damarupurshad, South Africa; Mally Likukela, Namibia; Gamini Zoysa and Ismail Kamil, Colombo, Sri Lanka;...of Mines; Mally Likukela, Directorate of Mines, Namibia; Murat Akgun, Zultanite Gems LLC, USA; the MarketDirect...the production is mixed with calcite. The spinel mine at Kuh-i-Lal is being operated by a skeleton crew |  | Song, Guoxue, Cook, Nigel J., Li, Guangming, Qin, Kezhang, Ciobanu, Cristiana L., Yang, Yueheng, Xu, Yingxia (2019) Scheelite geochemistry in porphyry-skarn W-Mo systems: A case study from the Gaojiabang Deposit, East China. Ore Geology Reviews, 113. 103084 doi:10.1016/j.oregeorev.2019.103084 | Journal (article/letter/editorial) | | 4b). Retrograde assemblages comprise tremolite, quartz, fluorite, epidote, calcite, chlorite, hornblende...banded and massive skarns, sometimes coexisting with quartz within veins (Fig. 4c, f, i) that crosscut the...and scheelite; and veins (Fig. 4a, c-e, g, h). Quartz-vein type W-Mo ores are mostly Mo-dominant, and...body, as well as an earlier generation of barren quartz veins. Disseminated porphyry type W-Mo ores are...sedimentary rocks. Moreover, scheelite can occur in quartz-scheelite veins that crosscut hornfels. Sulfides |  | | Journal (article/letter/editorial) | | Namaqualand, Namibia (Clifford et al., 1995); and the Pan-African Damara orogen, Namibia (Jung et al....Kazakhstan Central Namibia Okiep district New South Wales Karnataka Quebec Region SB/GB GB GB GB...Argentina Argentina Canada Austria Kazakhstan Namibia Namibia Australia India Canada Golden Chest Kalyan...Kyser, 1994; Anglin et al., 1996) Au (Ā± W)bearing quartz veins of the Abitibi greenstone belt (mineral districts...occurrences of the Okiep district, Namaqualand, Namibia (Raith, 1995; Raith and Stein, 2000), by the early |  | | Journal (article/letter/editorial) | | in both a massive skarn zone (MSZ; Type I) and a quartz porphyry fracture zone (QPFZ; Type II), forming...scheelites from a massive skarn zone (MSZ) and quartz porphyry fracture zone (QPFZ) in the Weondong Wāskarn...CambrianāOrdovician Choseon Supergroup (Park et al., 2018). A quartz porphyry and partially exposed volcanic dikes are...(Fig. 2a). These magmatic intrusions, especially quartz porphyry, triggered skarn formation that formed...2011; Park et al., 2017a). The quartz Porphyry consists mainly of quartz phenocrysts 1ā4 mm in size surrounded |
|
Otjua Mine, Otjua Farm 37, Karibib Constituency, Erongo Region, Namibia