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Eastern Chief Mine, Mt Riddock Station, Harts Range (Harts Ranges; Hartz Range; Hartz Ranges), Central Desert Region, Northern Territory, Australiai
Regional Level Types
Eastern Chief MineMine
Mt Riddock StationMountain
Harts Range (Harts Ranges; Hartz Range; Hartz Ranges)Mountain Range
Central Desert RegionRegion
Northern TerritoryTerritory

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Latitude & Longitude (WGS84):
23° 0' 34'' South , 135° 1' 21'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:

An abandoned mica mine. The Eastern Chief Mine occupies the crest of a low ridge, near Eastern Chief Creek, approximately 15 kilometres east south-east of Atitjere. No tracks could be seen to the location, and the deposit is remote in rugged mountainous country.

The mine geology is garnet and sillimanite bearing gneiss and pegmatite.
Joklik (1955) describes the geology of the mine area as 'The quartz core of the mica-bearing pegmatite is surrounded by combined intermediate and wall zones of microcline, plagioclase, and muscovite. The fine-grained border zones contain quartz and small muscovite euhedra."

The Mica Development and Transport Company was formed in Adelaide in 1924, with £20,000 capital to operate the mine, and at least one shipment of mica made it overseas. The company stated one man (un-named) had been operating the mine previously, and had produced one tonne of mica in 12 months. Hector Jenkins had the mine during the World War Two years, and Simon Rieff, after the war. Both appear at other locations for the Harts Range as well. History for the mine is extremely limited. Hector Jenkins kept a specimen collection at his Alice Springs home after he retired, consisting of gems from the Harts Range area. These he refused to sell, despite being offered high prices for them even in the 1950's. Visitors were awe struck by the gems. What happened to these is unknown, but unfortunately they were of such high quality they may have been faceted, and their provenance lost.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
North Australian Element, AustraliaCraton
Kalkarindji Igneous Province, Northern Territory, AustraliaGeologic Province
Arunta Orogen, AustraliaOrogen
Irindina Province, Arunta Orogen, AustraliaGeologic Province

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

4 valid minerals.

Detailed Mineral List:

Formula: Be3Al2(Si6O18)
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994
'Feldspar Group'
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994
Formula: KAl2(AlSi3O10)(OH)2
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994
Formula: SiO2
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994
Formula: Al2(SiO4)O
Reference: Zia U. Bajwah, Huckitta 1:250 000 Mineral deposit data series, Northern Territory Geological Survey, 1994

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Feldspar Group'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals arranged by Dana 8th Edition classification

Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.
'Feldspar Group'-
'Garnet Group'-X3Z2(SiO4)3

List of minerals for each chemical element

H MuscoviteKAl2(AlSi3O10)(OH)2
Be BerylBe3Al2(Si6O18)
O MuscoviteKAl2(AlSi3O10)(OH)2
O BerylBe3Al2(Si6O18)
O QuartzSiO2
O Garnet GroupX3Z2(SiO4)3
O SillimaniteAl2(SiO4)O
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al BerylBe3Al2(Si6O18)
Al SillimaniteAl2(SiO4)O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si BerylBe3Al2(Si6O18)
Si QuartzSiO2
Si Garnet GroupX3Z2(SiO4)3
Si SillimaniteAl2(SiO4)O
K MuscoviteKAl2(AlSi3O10)(OH)2

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

Series 2 - Terreneuvian
509 - 541 Ma

ID: 925863
Brady Gneiss

Age: Cambrian (509 - 541 Ma)

Stratigraphic Name: Brady Gneiss

Description: Schistose leucocratic garnet-muscovite-biotite gneiss; calc-silicate rock

Comments: high grade metamorphic rock; synthesis of multiple published descriptions

Lithology: High grade metamorphic rock

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]

1600 - 2500 Ma

ID: 3186582
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 Ma)

Comments: Arunta Block

Lithology: Granulite grade orthogneiss/paragneiss/metavolcanic gneiss

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, used under Creative Commons Attribution 4.0 License


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Centralian Advocate newspaper (Alice Springs) (1953) Harts Range Field History, 16/10/1953.
Centralian Advocate newspaper (Alice Springs) (1953) The History of Harts Range, 23/10/1953.
Observer newspaper (Adelaide) (1924) Northern Mica Deposits, 29/11/1924.
News newspaper (Adelaide) (1924) New Companies Registerred, 20/06/1924.
Joklik, G. F. (1955) The geology and mica-fields of the Harts Range, central Australia. Bureau of Mineral Resources, Geology amd Geophysics, Australia, Bulletin 26.
Sullivan, C.J. (1942) Brief notes on the Hart's Range mica mines, Department of National Development, Bureau of Mineral Resources, Geology and Geophysics, Commonwealth of Australia, Record 1942/39.
Daly, J. and Dyson, D.F. (1963) Radiometric Investigations at Anningie, Utopia, and The Bundley River Mineral Fields NT 1949, Department of National Development/Bureau of Mineral Resources, Geology and Geophysics, Commonwealth of Australia, Record No. 1963/45.
Kruttschnitt, J., Moss, F.A., Carter, S., Haney, T. (1951) Report on the Harts Range Mica Field, Mount Isa Mines Ltd, April 1951.
Jones, N.O. (1957) Report on the examination of beryl prospects, Harts Range, Northern Territory, Bureau of Mineral Resources, Australia, Record 1957/28.
Jensen, H.L. (1944) Mica mines, Mount Powell-Harding Springs locality. Northern Territory Geological Survey, Internal Report, Alice Springs Office, File MBR44/8 (unpublished).

This page contains all mineral locality references listed on 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 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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