1-20 OF 37 RESULTS FOR

Okorusu Mine

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 September 2023
South African Journal of Geology (2023) 126 (3): 295–314.
...S. Lohmeier; R. Ellmies; T. Adolffs; S. Sindern Abstract Former open-pit fluorite mining and processing at the Okorusu carbonatite deposit, Namibia, resulted in a large tailings dump comprising an old (~553 kt) and a new tailings part (~3.8 Mt). We characterise dump tailings mineralogically...
FIGURES | View All (11)
Journal Article
Published: 01 September 2023
South African Journal of Geology (2023) 126 (3): 315–336.
...S. Lohmeier; J. Machleidt; R. Klemd; R. Ellmies Abstract The Okorusu carbonatite complex and the mine’s tailings dump constitute a potential resource of rare earth elements meaning lanthanides and yttrium (REY). Small (≤100 μm), hydrothermal REE fluorcarbonates (bastnäsite, parisite, röntgenite...
FIGURES | View All (10)
Image
Simplified geology of the <span class="search-highlight">Okorusu</span> carbonatite complex (after Van Zijl,  196...
Published: 15 August 2019
Fig. 2. Simplified geology of the Okorusu carbonatite complex (after Van Zijl, 1962 ) with a 3D model of the Okorusu fluorite mine and the locations of samples used in this study (the fluorite ore bodies are represented in different colours only to differentiate fluorite in different pits
Journal Article
Published: 15 August 2019
Mineralogical Magazine (2020) 84 (1): 49–64.
...Fig. 2. Simplified geology of the Okorusu carbonatite complex (after Van Zijl, 1962 ) with a 3D model of the Okorusu fluorite mine and the locations of samples used in this study (the fluorite ore bodies are represented in different colours only to differentiate fluorite in different pits...
FIGURES | View All (11)
Journal Article
Published: 01 February 1995
Journal of the Geological Society (1995) 152 (1): 97–104.
... susceptible to such disturbance, yield a narrower range of ages (132–124 Ma, with one outlier at 149 Ma). New Rb–Sr internal isochron ages of 129.8 ± 3.8 Ma, 126.8 ± 1.3 Ma and 126.1 ± 7.3 Ma have been determined for an Etendeka quartz latite, and nepheline syenite intrusions in the Messum and Okorusu...
Journal Article
Published: 01 April 2007
The Canadian Mineralogist (2007) 45 (2): 405–406.
... of fluorspar mining” (P. Clavel and G. Neumeier); “France” (C. Lucas), an account of fluorite occurrences in France from the Alps to the Ardennes reveals a rich diversity; “China” (Guanghua Liu), a picturesque peek at the world’s third largest fluorite reserves; story tellers R. Currier and D. Blauet...
Journal Article
Published: 01 February 2020
Mineralogical Magazine (2020) 84 (1): 1–3.
... mineralisation at the Okorusu carbonatite, Namibia, demonstrating that the formation of late-stage REE mineralisation at this complex is associated with the breakdown of magmatic pyrite. Such breakdown would release sulfate into a hydrothermal fluid, which the authors suggest is responsible for the alteration...
Journal Article
Published: 01 December 2003
South African Journal of Geology (2003) 106 (4): 281–286.
... the Atlantic coastal region are found as far east as latitude 17° east, in the form of the Okorusu subvolcanic complex north of Otjiwarongo. On the basis of results presented here the Okorusu complex may represent the eastern limit of the Etendeka Province and this would confirm the marked asymmetry...
FIGURES
Journal Article
Journal: Elements
Published: 01 October 2021
Elements (2021) 17 (5): 327–332.
... complexes Carbonatites are one of the most prospective rock types on Earth. Almost 10% of carbonatite occurrences host an active or former mine and a further 10% are defined as a mineral resource ( Simandl and Paradis 2018 ). The principal commodities mined from carbonatites include phosphate...
FIGURES | View All (4)
Journal Article
Published: 01 August 2008
The Canadian Mineralogist (2008) 46 (4): 1033–1042.
... previously is spessartine from the Henderson mine in Colorado ( Smyth et al. 1990 ). The data presented here have implications not only for the interpretation of subsolidus processes in carbonatitic systems, but also further our understanding of the crystal chemistry of the garnet group, an important class...
FIGURES | View All (7)
Journal Article
Published: 01 October 2009
The Canadian Mineralogist (2009) 47 (5): 1105–1116.
....). Roedder , E. ( 1973 ): Fluid inclusions from the fluorite deposits associated with carbonatite at Amba Dongar, India, and Okorusu, South West Africa . Inst. Mining Metall. Trans . B 82 , 35 – 39 . Ruberti , E. , Castorina , F. , Censi , P. , Comin-Chiaramonti , P. , Gomes...
FIGURES | View All (6)
Journal Article
Published: 11 December 2019
Mineralogical Magazine (2020) 84 (1): 65–80.
... carbonatite is mined as a molybdenum deposit, but is considered to be part of a key REE -producing area of China, although its reserves and grades for the REE are unpublished (Kynický et al. , 2012 ). The presence of quartz with associated fluid inclusions, together with hydrothermal HREE -rich minerals...
FIGURES | View All (10)
Journal Article
Published: 01 July 2021
Mineralogical Magazine (2021) 85 (4): 496–513.
.... Oxidation of primary minor pyrite present in calcite carbonatite by the hydrothermal fluid probably enabled crystallisation of Sr- and Ba-sulfates at the end of the process, as was also assumed for the Okorusu carbonatite complex (Cangelosi et al. , 2020 ). A transition from secondary marcasite after...
FIGURES | View All (10)
Journal Article
Journal: Economic Geology
Published: 01 January 2016
Economic Geology (2016) 111 (1): 199–223.
... it was drilled by Spectrum Mining Corp. They reported that the carbonatite contains a resource of 11.3 million tonnes grading 1.95 wt % total rare earth oxides (TREO; Lane, 2010 ), making it the best prospect for an economic REE deposit in British Columbia ( Lane, 2010 ). The REE mineralization is concentrated...
FIGURES | View All (21)
Journal Article
Journal: Economic Geology
Published: 01 August 2002
Economic Geology (2002) 97 (5): 1143–1150.
... evidence from the Okorusu fluorite deposit, Namibia— B. Bühn, A. H. Rankin, J. Schneider, and P. Dulski 75 Rb isotope dilution analyses by MC-ICPMS using Zr to correct for mass fractionation: towards improved Rb-Sr geochronology? — Tod Waight, Joel Baker, and Bart Willigers 99 The effect of melt...
Journal Article
Journal: Elements
Published: 01 October 2021
Elements (2021) 17 (5): 307–314.
... of associated rocks in a particular carbonatitic complex strongly depends on that complex’s erosion level and on the results of drilling and mining activities. Associations of silicate rocks typically found with carbonatite in a plutonic complex may include olivinite, peridotite, pyroxenite, melilitolite...
FIGURES | View All (6)
Journal Article
Journal: Economic Geology
Published: 01 September 2020
Economic Geology (2020) 115 (6): 1363–1369.
... in mineral exploration and mining Clifford R. Stanley 233 256 GEOCHEMISTRY INTERNATIONAL Vol. 58, No. 5, 2020 SEM study of the surface of arsenopyrite and pyrite from the Natalkinskoe deposit, northeastern Russia R.G. Kravtsova, V.L. Tauson, and N.A. Goryachev 531 538 GEOCHIMICA ET COSMOCHIMICA ACTA Vol. 280...
Journal Article
Published: 01 August 2008
Mineralogical Magazine (2008) 72 (4): 909–924.
... by the greater energy density of the stationary electron beam in OM-CL. Another reason may be a difference in the spectral range used for imaging as explained in more detail below. F ig . 7. OM-CL (left) and SEM-CL (right) images of the same sample area of a fluorite sample from Okorusu, Namibia showing...
FIGURES | View All (20)
Journal Article
Published: 09 April 2021
Geochemistry: Exploration, Environment, Analysis (2021) 21 (2): geochem2019-082.
...-Zn mine: HTP and the Heiyanao Fe-Cu-Pb-Zn mine: HYA) and the overlying or nearby soils to better understand REE concentrations, distributions and behaviour during weathering from different parent materials at the regional scale, Baoshan area, Yunnan Province, SW China. The mudstone and sandstone...
FIGURES | View All (8)
Journal Article
Published: 22 July 2021
Geological Magazine (2021) 158 (11): 2025–2041.
... is conspicuously K-feldspar-phyric, with the phenocrysts exhibiting a trachytic texture. Some of the feldspar is euhedral, but many grains are fragmented and broken (Fig.  4 c). Crystal phases and their petrographic relationships were determined on polished thin-sections at Camborne School of Mines, University...
FIGURES | View All (10)