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Mount Joel gold prospects, Bronzewing Goldfield (Mount McClure), Leonora Shire, Western Australia, Australiai
Regional Level Types
Mount Joel gold prospectsGroup of Prospects
Bronzewing Goldfield (Mount McClure)Ore Field
Leonora ShireShire
Western AustraliaState
AustraliaCountry

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Latitude & Longitude (WGS84):
27° 13' 34'' South , 121° 2' 21'' East
Latitude & Longitude (decimal):
-27.22600,121.03929
GeoHash:
G#: qenj47dj5
GRN:
S19E76
Type:
Group of Prospects
Köppen climate type:
BWh : Hot deserts climate
Mindat Locality ID:
206122
Long-form identifier:
mindat:1:2:206122:4
GUID (UUID V4):
0


Located about 20 km NE of the Bronzewing Mine.

The Mount Joel prospects cover five identified anomalous gold prospects in regolith, along an 8 kilometre, north south trending strike zone. The relief is generally flat, with weathering to a few metres in the north and central parts to 80 metres in the south.

Fresh rock is variably sheared and hydrothermally altered metabasalts and amphibolite. Gold is found in sulphide poor quartz vein stockworks. The gold is usually free, and sometimes visible, associated with concentrations of As, Sb and W.

There are three mineral assemblages at Mt Joel: chloritoid-chlorite-plagioclase-quartz-garnet; chlorite-plagioclase-quartz-garnet; and chlorite-hornblende-plagioclase-quartz-garnet. The variety reflects the range of mineral chemistry and alteration processes effecting the metabasic rocks. The garnets are manganese rich, with up to 25% spessartine content.

The five prospects are named 3000mN, 2400mN, 1600mN, 800 mN, and OmN.

In general they show major variablity in gold concentrations depending on depth. Residual enrichment of gold in the transition zone amounts to 50 to 100%. A relative Au poor zone in the upper oxide areas at 3000mN and 2400mN. A marked interface, most apparent at the 800mN and OmN prospects. Lower grade Au in the transported overburden, except at 0mN, where it is thought gold has been transported in from other Au rich areas. There is a poor correlation between quartz content and gold at the 0mN prospect.

The source goes into great detail describing the regolith which will not be repeated here. Very generally there is a pisolitic and laterite zone and sometimes paleaochannel sediments and clays at the top. Upper levels are often strongly leached and contain kaolin. Below this is a saprolite zone which depending on depth, leaching, the influence of Fe can be bright reddish brown, purple, orange, or yellow. Below this is saprock.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


9 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ 'Chlorite Group'
ⓘ Chloritoid
Formula: Fe2+Al2O(SiO4)(OH)2
ⓘ Cummingtonite
Formula: ◻{Mg2}{Mg5}(Si8O22)(OH)2
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Gold
Formula: Au
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ 'Tourmaline'
Formula: AD3G6 (T6O18)(BO3)3X3Z

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘChloritoid9.AF.85Fe2+Al2O(SiO4)(OH)2
ⓘCummingtonite9.DE.05◻{Mg2}{Mg5}(Si8O22)(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Tourmaline'-AD3G6 (T6O18)(BO3)3X3Z
ⓘ'Hornblende Root Name Group'-◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ ChloritoidFe2+Al2O(SiO4)(OH)2
Hⓘ Cummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
BBoron
Bⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
OOxygen
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ ChloritoidFe2+Al2O(SiO4)(OH)2
Oⓘ Cummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ TourmalineAD3G6 (T6O18)(BO3)3X3Z
Oⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Garnet GroupX3Z2(SiO4)3
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
NaSodium
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Cummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2
AlAluminium
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ ChloritoidFe2+Al2O(SiO4)(OH)2
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ ChloritoidFe2+Al2O(SiO4)(OH)2
Siⓘ Cummingtonite◻{Mg2}{Mg5}(Si8O22)(OH)2
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Garnet GroupX3Z2(SiO4)3
SSulfur
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
ClChlorine
Clⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ Hornblende Root Name Group◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChloritoidFe2+Al2O(SiO4)(OH)2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
AuGold
Auⓘ GoldAu

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

Neil Phillips, G., Vearncombe, J.R., and Eshuys, E. (1998): Yandal Greenstone Belt, Western Australia- 12 million ounces of gold in the 1990s. Mineralium Deposita (1998):33: 310-316.
Farrell, N (1998), Garnet Bearing Metabasic Rocks at Mt Joel: an investigation into distribution petrology and equilibrium thermodynamic modelling, 1998
Gray, D.J. (1999), Gold Concentrations in the Regolith at the Mt Joel Prospect Western Australia, CRC LEME, 1999
Porto, C.G., Sergeev, N.B., Gray D.J. (1999), Gold Distribution Regolith and Groundwater Characteristics at the Mt Joel Prospect Western Australia, CRC LEME, 1999
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