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Ogonja (Onganja), Seeis, Windhoek District, Khomas Region, Namibiai
Regional Level Types
Ogonja (Onganja)- not defined -
Seeis- not defined -
Windhoek DistrictDistrict
Khomas RegionRegion
NamibiaCountry

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 22° 5' 58'' South , 17° 27' 30'' East (est.)
Margin of Error:~0km
Köppen climate type:BSh : Hot semi-arid (steppe) climate


District with several copper mines some 80km northeast of Windhoek. The Onganja mine is the most significant mineral deposit in a group of quartz-calcite-copper-molybdenum veins that extend over an area of 40km situated in the upper catchment basin of the Swakop River. Copper prospect & mines are found on farms Asgard 192, Otjiterazu West 67, Midgard 191, Okatjemisse 68, Otjisonjati 69, Okamuwa 144, Helen 235, Onganja West 71 & Klein Onganja 148. The Onganja mine is situated on Helen 235 & in the past ownership changed several times & was also known as Emke, Emka & Otjisongati.

The Onganja mine is situated on the Voitskopf vein which is continuous with the Maygift vein straddling the border between farms Helen 235 & Klein Onganja 148. Other veins in the immediate vicinity are Omahanga, Kronriff, Feldspatriff, Stanley, Kriegsfeldgang & several alphabetical veins A, B, E, F, G, H, L, N, all the veins are grouped as the Onganja mining area. Mineral specimens of cuprite & native copper came mostly from the Voitskopf-Maygift vein system.

Regions containing this locality

African Plate

Plate - 0 mineral species & varietal names listed

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Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

22 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
'Apatite'
Azurite
Formula: Cu3(CO3)2(OH)2
'Biotite'
Brochantite
Formula: Cu4(SO4)(OH)6
Calcite
Formula: CaCO3
Chalcocite
Formula: Cu2S
Chalcopyrite
Formula: CuFeS2
'Chlorite Group'
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Copper
Formula: Cu
Cuprite
Formula: Cu2O
Cuprite var: Chalcotrichite
Formula: Cu2O
Fluorapatite
Formula: Ca5(PO4)3F
Goethite
Formula: α-Fe3+O(OH)
Gold
Formula: Au
Hematite
Formula: Fe2O3
Magnetite
Formula: Fe2+Fe3+2O4
Malachite
Formula: Cu2(CO3)(OH)2
Molybdenite
Formula: MoS2
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Rutile
Formula: TiO2
'Scapolite'
Siderite
Formula: FeCO3
Silver
Formula: Ag
Smithsonite
Formula: ZnCO3

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
'Chalcocite'2.BA.05Cu2S
'Chalcopyrite'2.CB.10aCuFeS2
Molybdenite2.EA.30MoS2
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
var: Chalcotrichite4.AA.10Cu2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
'Azurite'5.BA.05Cu3(CO3)2(OH)2
'Calcite'5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Siderite5.AB.05FeCO3
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Brochantite'7.BB.25Cu4(SO4)(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
'Albite'9.FA.35Na(AlSi3O8)
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Biotite'-
Chlorite Group-
Scapolite-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Gold1.1.1.1Au
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
A2X3
Hematite4.3.1.2Fe2O3
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Siderite14.1.1.3FeCO3
Smithsonite14.1.1.6ZnCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A5(XO4)3Zq
Fluorapatite41.8.1.1Ca5(PO4)3F
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Biotite'-
'Chlorite Group'-
Cuprite
var: Chalcotrichite
-Cu2O
'Scapolite'-

List of minerals for each chemical element

HHydrogen
H AzuriteCu3(CO3)2(OH)2
H BrochantiteCu4(SO4)(OH)6
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H Goethiteα-Fe3+O(OH)
H MalachiteCu2(CO3)(OH)2
CCarbon
C AzuriteCu3(CO3)2(OH)2
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
C SideriteFeCO3
C SmithsoniteZnCO3
OOxygen
O AlbiteNa(AlSi3O8)
O AzuriteCu3(CO3)2(OH)2
O BrochantiteCu4(SO4)(OH)6
O CalciteCaCO3
O Cuprite (var: Chalcotrichite)Cu2O
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O CupriteCu2O
O FluorapatiteCa5(PO4)3F
O Goethiteα-Fe3+O(OH)
O HematiteFe2O3
O MagnetiteFe2+Fe23+O4
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O RutileTiO2
O SideriteFeCO3
O SmithsoniteZnCO3
FFluorine
F FluorapatiteCa5(PO4)3F
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si AlbiteNa(AlSi3O8)
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
PPhosphorus
P FluorapatiteCa5(PO4)3F
SSulfur
S BrochantiteCu4(SO4)(OH)6
S ChalcociteCu2S
S ChalcopyriteCuFeS2
S MolybdeniteMoS2
S PyriteFeS2
CaCalcium
Ca CalciteCaCO3
Ca FluorapatiteCa5(PO4)3F
TiTitanium
Ti RutileTiO2
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe MagnetiteFe2+Fe23+O4
Fe PyriteFeS2
Fe SideriteFeCO3
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu BrochantiteCu4(SO4)(OH)6
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu Cuprite (var: Chalcotrichite)Cu2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu CopperCu
Cu CupriteCu2O
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn SmithsoniteZnCO3
MoMolybdenum
Mo MolybdeniteMoS2
AgSilver
Ag SilverAg
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cairncross, B. and Moir, S. (1996) Famous Mineral Localities: The Onganja Mining District, Namibia. Mineralogical Record, 27(2), 85-97.
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, (in English).
Moore, J.M. (2010).Comparative study of the Onganja copper mine, Namibia: a kink between Neoproterozoic mesothermal Cu(Au) mineralization in Namibia and Zambia. South African Journal of Geology 113(4), 445-460.

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