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Koolyanobbing, Yilgarn Shire, Western Australia, Australiai
Regional Level Types
Koolyanobbing- not defined -
Yilgarn ShireShire
Western AustraliaState
AustraliaCountry

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Latitude & Longitude (WGS84):
30° 49' 2'' South , 119° 31' 12'' East
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Southern Cross712 (2012)49.2km
Mindat Locality ID:
241263
Long-form identifier:
mindat:1:2:241263:7
GUID (UUID V4):
4e123a98-5ab6-4ae8-859d-84aad0032f68


The name comes from the local aboriginal language meaning 'place of large rocks', which is apt for an iron ore mine.

The mine is located 54 kilometres north north-east of Southern Cross.

The first non-aboriginal person to explore the area was gold prospector Henry Dowd in 1887 and 1891. He was rather unimpressed with the rocks seen, but placed some in a bottle anyway, and buried it by a survey peg at what would later be known as Dowd or Dowd's Hill. The bottle was discovered in 1963.

Mining first took place by the Western Australian Government in 1948, supplying iron ore to its charcoal iron plant at Wundowie.

Geological surveys in 1952 identified significant iron ore. Dampier Mining (a subsidiary of BHP) mined iron ore here between 1967 to 1983. The ore was railed to its steel blast furnace at Kwinana, south of Perth.

Mining recommenced in 1993 by Portman Mining, which was taken over by Cliffs Natural Resources in 2008, who have continued mining. Ore is railed to the port of Esperance. They also mine iron ore at Mt Jackson and Windarling Range to the north of Koolyanobbing.

Dowd's Hill is the largest of five mining areas extending south along the Koolyanobbing Range. It is hosted by a 60 kilometre long north north-west trending greenstone belt, truncated west, north and south by the Koolyanobbing Fault.

The dominant rock is fine to medium grained actinolite amphibolite, with thin discontinuous bands of chert, banded quartzite, and banded iron formations. The latter is composed of banded magnetite schist and quartz-magnetite, which is turn contains siderite, and massive pyrite with hematite, minor magnetite, and graphite.

Dowd's Hill is the largest deposit, 900m long by 50-300m wide and 50-80m deep from the surface. The ore is massive hard goethite, course grained friable specular hematite, massive fine grained hematite, ochrous yellow limonite, minor magnetite, bands of chlorite schist, and friable iron leached jaspilite.

Specimens from the mine were once thought rare. Across 2010-2011, local collector and specimen miner, Fred Rose, sold about four dozen specimens, which are now in private collections. These variously covered fine grained, iridescent and botryoidal goethite, bladed specularite, hematite mica, micro magnetite crystals, some on ironstone and banded iron formation matrix.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

17 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

β“˜ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
β“˜ Azurite
Formula: Cu3(CO3)2(OH)2
β“˜ Beryl
Formula: Be3Al2(Si6O18)
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
β“˜ Chalcocite
Formula: Cu2S
β“˜ 'Chlorite Group'
β“˜ Fluorite
Formula: CaF2
β“˜ Goethite
Formula: Ξ±-Fe3+O(OH)
β“˜ Graphite
Formula: C
β“˜ Hematite
Formula: Fe2O3
β“˜ Hematite var. Specularite
Formula: Fe2O3
β“˜ 'Limonite'
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Malachite
Formula: Cu2(CO3)(OH)2
β“˜ Powellite
Formula: Ca(MoO4)
β“˜ Pyrite
Formula: FeS2
β“˜ Quartz
Formula: SiO2
β“˜ Siderite
Formula: FeCO3
β“˜ Talc
Formula: Mg3Si4O10(OH)2
β“˜ Topaz
Formula: Al2(SiO4)(F,OH)2
β“˜ Tremolite
Formula: ◻Ca2Mg5(Si8O22)(OH)2

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
β“˜Chalcocite2.BA.05Cu2S
β“˜Pyrite2.EB.05aFeS2
Group 3 - Halides
β“˜Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
β“˜Goethite4.00.Ξ±-Fe3+O(OH)
β“˜Hematite4.CB.05Fe2O3
β“˜var. Specularite4.CB.05Fe2O3
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Azurite5.BA.05Cu3(CO3)2(OH)2
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
β“˜Siderite5.AB.05FeCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
β“˜Powellite7.GA.05Ca(MoO4)
Group 9 - Silicates
β“˜Actinolite9.DE.10β—»Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
β“˜Beryl9.CJ.05Be3Al2(Si6O18)
β“˜Talc9.EC.05Mg3Si4O10(OH)2
β“˜Topaz9.AF.35Al2(SiO4)(F,OH)2
β“˜Tremolite9.DE.10β—»Ca2Mg5(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
β“˜'Chlorite Group'-
β“˜'Limonite'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ GoethiteΞ±-Fe3+O(OH)
Hβ“˜ TalcMg3Si4O10(OH)2
Hβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ AzuriteCu3(CO3)2(OH)2
Hβ“˜ TopazAl2(SiO4)(F,OH)2
Hβ“˜ Tremolite◻Ca2Mg5(Si8O22)(OH)2
BeBeryllium
Beβ“˜ BerylBe3Al2(Si6O18)
CCarbon
Cβ“˜ SideriteFeCO3
Cβ“˜ GraphiteC
Cβ“˜ MalachiteCu2(CO3)(OH)2
Cβ“˜ AzuriteCu3(CO3)2(OH)2
OOxygen
Oβ“˜ GoethiteΞ±-Fe3+O(OH)
Oβ“˜ HematiteFe2O3
Oβ“˜ SideriteFeCO3
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ QuartzSiO2
Oβ“˜ TalcMg3Si4O10(OH)2
Oβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oβ“˜ Hematite var. SpeculariteFe2O3
Oβ“˜ PowelliteCa(MoO4)
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ AzuriteCu3(CO3)2(OH)2
Oβ“˜ BerylBe3Al2(Si6O18)
Oβ“˜ TopazAl2(SiO4)(F,OH)2
Oβ“˜ Tremolite◻Ca2Mg5(Si8O22)(OH)2
FFluorine
Fβ“˜ FluoriteCaF2
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Fβ“˜ TopazAl2(SiO4)(F,OH)2
MgMagnesium
Mgβ“˜ TalcMg3Si4O10(OH)2
Mgβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Mgβ“˜ Tremolite◻Ca2Mg5(Si8O22)(OH)2
AlAluminium
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Alβ“˜ BerylBe3Al2(Si6O18)
Alβ“˜ TopazAl2(SiO4)(F,OH)2
SiSilicon
Siβ“˜ QuartzSiO2
Siβ“˜ TalcMg3Si4O10(OH)2
Siβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
Siβ“˜ BerylBe3Al2(Si6O18)
Siβ“˜ TopazAl2(SiO4)(F,OH)2
Siβ“˜ Tremolite◻Ca2Mg5(Si8O22)(OH)2
SSulfur
Sβ“˜ PyriteFeS2
Sβ“˜ ChalcociteCu2S
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
CaCalcium
Caβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caβ“˜ PowelliteCa(MoO4)
Caβ“˜ FluoriteCaF2
Caβ“˜ Tremolite◻Ca2Mg5(Si8O22)(OH)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
FeIron
Feβ“˜ PyriteFeS2
Feβ“˜ GoethiteΞ±-Fe3+O(OH)
Feβ“˜ HematiteFe2O3
Feβ“˜ SideriteFeCO3
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feβ“˜ Hematite var. SpeculariteFe2O3
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2
CuCopper
Cuβ“˜ MalachiteCu2(CO3)(OH)2
Cuβ“˜ AzuriteCu3(CO3)2(OH)2
Cuβ“˜ ChalcociteCu2S
MoMolybdenum
Moβ“˜ PowelliteCa(MoO4)

Localities in this Region

Other Regions, Features and Areas containing this locality

Australia
Australian PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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