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Woodlands variscite deposit (Low Hill; Waldburg variscite deposit), Woodlands station, Upper Gascoyne Shire, Western Australia, Australiai
Regional Level Types
Woodlands variscite deposit (Low Hill; Waldburg variscite deposit)Deposit
Woodlands station- not defined -
Upper Gascoyne ShireShire
Western AustraliaState
AustraliaCountry

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Key
Lock Map
Latitude & Longitude (WGS84): 24° 41' 30'' South , 117° 42' 6'' East
Latitude & Longitude (decimal): -24.69171,117.70182
GeoHash:G#: qeeew35b7
Locality type:Deposit
Köppen climate type:BWh : Hot deserts climate


Unusual phosphate deposit containing visible particles of gold.
Located near Low Hill, about 9 km NW of Mt. Egerton, about 50 km NW of the Woodlands station.


Originally listed on Mindat as 'Low Hill', the main written reference for the location calls it ' The Woodlands Variscite-Gold Occurrence'. This is a bit of a mouthful so has been shortened to the Woodlands Variscite Deposit. Low Hill itself is 5 kilometres south of the variscite location, although provides little help in finding it within the jumble of hills in the area. Mt Egerton is visible from the road as clearly a higher mountain.

The deposit is difficult to locate. The Mount Augustus-Woodlands Road is a little used small gravel road which leads east-west between these locations. A two wheel track, directly north of Low Hill but unseen from the road, leads south from this road towards a ridge. Parking at the base of the ridge, its then about a two kilometre walk across to the southern side of the ridge.

A vague reference to a phosphate occurrence in the area was made in 1983 by mining exploration company Geopeko Pty Ltd. Specimen miners David Vaughan and Glen Archer were searching for alternative variscite locations to the Milgun Mine, which was under control of a rival firm. A search of the area detailed in the 1983 report located the variscite deposit, noted for its superior hardness, variegated appearance, and inclusions of gold particles. It was mined in 2006, before being covered in rubble and left.

The variscite occurrence is within the Mesoproterozoic Edmund Basin in the central part of the Capricorn Orogen. The phosphates occur in Kiangi Creek Formation siltstone and fine grained sandstone, of the Middle Edmund Group, intruded locally by 1465Ma old dolerite sills and folded. Interesting rocks occur around the phosphate deposit in the country rock.

The variscite occurs in an area 0.5 metres thick along a strike length of 1 kilometre, as several thin seams 10-50mm thick.

Within the deposit is a main discordant vein, being an intergrowth of variscite and crandallite. The crandallite is intermixed with alunite-jarosite and yellow, fine grained masses and veinlets of kaolinite. The variscite is often a dark olive green, in comparison to the lighter green of the Milgun variscite. The variscite can be webbed, be of massive blocks, balloon-like masses, nodular aggregates, breccias and finely fractured masses with crandallite.

The more minor stratabound seams contain pale-green variscite, sometimes with shreds of siltstone and sphericules of wardite along the edges of the seams. Or the seams contain porous bluish-green turquoise with small inclusions of apatite, and larger nodular intergrown masses of variscite, quartz and apatite. The last species is also found as thin discontinuous
layers in the wall-rock parallel to the thicker variscite-turquoise seams.

One unusual aspect of the deposit is the inclusion of gold particles and dendritic growths with the variscite in the main vein. The gold ranges from microscopic to barely visible at 2mm, and was only found in a small amount of the variscite.

After mining, the area of excavation was covered with rubble. However, this appears to contain material from both the main seam, and the minor stratabound seams. While not insitu, there was ample evidence of the rocks mentioned above (with maybe the exception of gold).

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
West Australian Element, Western Australia, AustraliaCraton
Warakurna Large Igneous Province, Western Australia, AustraliaGeologic Province
Edmund Basin, Western Australia, AustraliaBasin

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and 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:

Alunite
Formula: KAl3(SO4)2(OH)6
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
'Apatite'
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Crandallite
Formula: CaAl3(PO4)(PO3OH)(OH)6
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Gold
Formula: Au
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Kim MacDonald collection
Metavariscite
Formula: AlPO4 · 2H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Millisite ?
Formula: (Na,K)CaAl6(PO4)4(OH)9 · 3H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Montgomeryite ?
Formula: Ca4MgAl4(PO4)6(OH)4 · 12H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Pyrite
Formula: FeS2
Reference: Kim MacDonald collection
Quartz
Formula: SiO2
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Strengite ?
Formula: FePO4 · 2H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Turquoise
Formula: Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Variscite
Formula: AlPO4 · 2H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.
Wardite
Formula: NaAl3(PO4)2(OH)4 · 2H2O
Reference: Nickel, E. H. et al. (2008): The Woodlands variscite-gold occurrence in the north Gascoyne region of Western Australia. Australian Journal of Mineralogy 14, 27-36.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Pyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Group 8 - Phosphates, Arsenates and Vanadates
Crandallite8.BL.10CaAl3(PO4)(PO3OH)(OH)6
Metavariscite8.CD.05AlPO4 · 2H2O
Millisite ?8.DL.10(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
Montgomeryite ?8.DH.25Ca4MgAl4(PO4)6(OH)4 · 12H2O
Strengite ?8.CD.10FePO4 · 2H2O
Turquoise8.DD.15Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Variscite8.CD.10AlPO4 · 2H2O
Wardite8.DL.10NaAl3(PO4)2(OH)4 · 2H2O
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Metavariscite40.4.3.1AlPO4 · 2H2O
Strengite ?40.4.1.2FePO4 · 2H2O
Variscite40.4.1.1AlPO4 · 2H2O
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Crandallite42.7.3.1CaAl3(PO4)(PO3OH)(OH)6
Millisite ?42.7.9.1(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
Wardite42.7.8.2NaAl3(PO4)2(OH)4 · 2H2O
(AB)7(XO4)4Zq·xH2O
Turquoise42.9.3.1Cu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
(AB)3(XO4)2Zq·xH2O
Montgomeryite ?42.11.8.1Ca4MgAl4(PO4)6(OH)4 · 12H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Apatite'-
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H VarisciteAlPO4 · 2H2O
H CrandalliteCaAl3(PO4)(PO3OH)(OH)6
H MetavarisciteAlPO4 · 2H2O
H TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
H WarditeNaAl3(PO4)2(OH)4 · 2H2O
H AluniteKAl3(SO4)2(OH)6
H JarositeKFe3+ 3(SO4)2(OH)6
H KaoliniteAl2(Si2O5)(OH)4
H Limonite(Fe,O,OH,H2O)
H MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
H Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
H StrengiteFePO4 · 2H2O
OOxygen
O VarisciteAlPO4 · 2H2O
O CrandalliteCaAl3(PO4)(PO3OH)(OH)6
O MetavarisciteAlPO4 · 2H2O
O TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
O WarditeNaAl3(PO4)2(OH)4 · 2H2O
O AluniteKAl3(SO4)2(OH)6
O JarositeKFe3+ 3(SO4)2(OH)6
O KaoliniteAl2(Si2O5)(OH)4
O QuartzSiO2
O Limonite(Fe,O,OH,H2O)
O MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
O Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
O StrengiteFePO4 · 2H2O
NaSodium
Na WarditeNaAl3(PO4)2(OH)4 · 2H2O
Na Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
MgMagnesium
Mg MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
AlAluminium
Al VarisciteAlPO4 · 2H2O
Al CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Al MetavarisciteAlPO4 · 2H2O
Al TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Al WarditeNaAl3(PO4)2(OH)4 · 2H2O
Al AluniteKAl3(SO4)2(OH)6
Al KaoliniteAl2(Si2O5)(OH)4
Al MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
Al Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
SiSilicon
Si KaoliniteAl2(Si2O5)(OH)4
Si QuartzSiO2
PPhosphorus
P VarisciteAlPO4 · 2H2O
P CrandalliteCaAl3(PO4)(PO3OH)(OH)6
P MetavarisciteAlPO4 · 2H2O
P TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
P WarditeNaAl3(PO4)2(OH)4 · 2H2O
P MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
P Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
P StrengiteFePO4 · 2H2O
SSulfur
S AluniteKAl3(SO4)2(OH)6
S JarositeKFe3+ 3(SO4)2(OH)6
S PyriteFeS2
KPotassium
K AluniteKAl3(SO4)2(OH)6
K JarositeKFe3+ 3(SO4)2(OH)6
CaCalcium
Ca CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Ca MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
Ca Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
FeIron
Fe TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Fe StrengiteFePO4 · 2H2O
CuCopper
Cu TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
AuGold
Au GoldAu

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 703971
colluvium 38491

Age: Pleistocene (0 - 2.588 Ma)

Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite

Comments: regolith; synthesis of multiple published descriptions

Lithology: Regolith

Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5]

Mesoproterozoic
1000 - 1600 Ma



ID: 3193042
Mesoproterozoic sedimentary rocks

Age: Mesoproterozoic (1000 - 1600 Ma)

Stratigraphic Name: Bangemall Group

Comments: Bangemall Basin

Lithology: Carbonate,shale,sandstone

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Nickel, E. H. et al. (2008) The Woodlands Variscite-gold Occurrence in the North Gascoyne Region of Western Australia. Australian Journal of Mineralogy (2008):14: 27-36.
Willing, M., Stocklmayer, S. and Wells, M. (2008): Journal of Gemmology (2008):31: 111-124.
Fetherston, J.M., Stocklmayer, S.M., Stocklmayer, V.C. (2013) Gemstones of Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 25, 306p. [pp. 221-222 as 'Waldburg variscite deposit']


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.
 
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