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Prairie Downs deposit 1, Prairie Downs station, Meekatharra Shire, Western Australia, Australia

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Latitude & Longitude (WGS84): 24° 24' 25'' South , 119° 18' 41'' East
Latitude & Longitude (decimal): -24.40714,119.31152
GeoHash:G#: qesv5hb40
Locality type:Deposit
Kim 2016- more information is needed on this site. At the time of investigation three sites had been listed on Mindat as a Prairie Downs deposit on the station. The locations given were (-) 24.4071379177-119.311523438; (-) 24.0865892582-119.091796875; and (-) 23.71666667-119.28333333.

The original listing from Marston, R.J. (1979) lists baryte, calcite, chalcopyrite, galena, gypsum, pyrite and sphalerite. Investigations found a possible answer.

Site 1 is in the southern part of the station as a base metal deposit (Zn, Pb and some baryte). It is assumed Marston was referring to this, and is listed as Prairie Downs deposit 1.

Site 2 is at the northern end of the station, 40 kilometres south-west of Newman, listed as Prairie Downs deposit 2. It may just be within the East Pilbara Shire. The map for this was taken off an exploration company, but is close to the -23, 19 co- ordinates originally listed.

Site 3 is in the middle latitude, just west of the Great Northern Highway as again an iron ore deposit, listed as Prairie Downs deposit 3.

The following was gleaned from the exploration company website about Prairie Downs 1 , and several prospects added. All appear to be anomalies and at the time of writing had been poorly explored.

For the Prairie prospect it was only stated that there was a 2004 JORC resource estimate of 3 Mt @ 5.0 Zn, 1.6 Pb, 15 g/t Ag, with 75% of the resource in the Indicated category.

Ferguson states its is a partly filled quartz fault zone, up to 250 metres wide, dipping steeply north-east, in metamorphosed mafic and komatiitic volcanic rocks of the Fortescue Group, the east side faulted against the Prairie Downs Formation, and west side against arenite and conglomerate, intruded by dolerite.
Köppen climate type:BWh : Hot deserts climate


A large, possibly Sedex Zn deposit on Prairie Downs station, presently poorly explored (2016). The main Zn mineral is baileychlore.

The following was gleaned from the exploration company website about Prairie Downs 1 , and several prospects added. All appear to be anomalies and at the time of writing had been poorly explored.

For the Prairie prospect it was only stated that there was a 2004 JORC resource estimate of 3 Mt @ 5.0 Zn, 1.6 Pb, 15 g/t Ag, with 75% of the resource in the Indicated category.

Ferguson states its is a partly filled quartz fault zone, up to 250 metres wide, dipping steeply north-east, in metamorphosed mafic and komatiitic volcanic rocks of the Fortescue Group, the east side faulted against the Prairie Downs Formation, and west side against arenite and conglomerate, intruded by dolerite.

The zone strikes 2.4 kilometres of galena, sphalerite, and minor chalcopyrite and pyrite in veins, in a shear zone up to 3.6 metres wide and 60 metres long. Irregular veins and stringers in quartz-barite, disseminated sphalerite in volcanic breccia, conglomerate, and massive pods of solid galena-sphalerite.

Explored by Australian Ore and Minerals 1967-1971, India Ocean Resources 1984-1985, and Sovereign Resources 1991.

Marston (1979) states mineralization is irregular in grade and extent, then dismisses it as weak and sporadic.


Mineral List


9 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

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

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]

Stenian - Ectasian
1000 - 1400 Ma



ID: 811928
Calyie Formation

Age: Mesoproterozoic (1000 - 1400 Ma)

Stratigraphic Name: Calyie Formation

Description: Recrystallised fine to coarse sandstone, in places glauconitic, with lesser interbedded siltstone, granule to pebble conglomerate, shale, mudstone, dolostone, pebbly sandstone, minor chert and dolostone

Comments: sedimentary siliciclastic; argillaceous detrital sediment; synthesis of multiple published descriptions

Lithology: Sedimentary siliciclastic; argillaceous detrital sediment

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]

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



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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
White, A.J.R. (2016) Distinguishing local and regional alteration systems. Presentation, AESC 2016 conference, Adelaide. Geological Society of Australia.
Marston, R.J. (1979) Copper Mineralisation in Western Australia. Mineral Resources Bulletin 13, Geological Survey of Western Australia, 208 pp. 
Ferguson, K.M. (1999) Lead, Zinc and Silver Deposits of Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 15.

External Links


 
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