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GEMCO Mine, Groote Eylandt, East Arnhem Region, Northern Territory, Australia

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Latitude & Longitude (WGS84): 14° 0' South , 136° 30' East
Latitude & Longitude (decimal): -14.00000,136.50000
Owned/operated by:GEMCO (Groote Eylandt Mining Company Operation)
Köppen climate type:Aw : Tropical savanna, wet

Large Mn mine. Owned by GEMCO company.
Oolitic and pisolitic lateritic manganese ores. 2-20 m thick deposit over area of 6x22 km.

Mineral List

14 valid minerals.

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

1600 - 1800 Ma

ID: 786946
Dalumbu Sandstone

Age: Statherian (1600 - 1800 Ma)

Stratigraphic Name: Dalumbu Sandstone

Description: White, medium and coarse-grained, cross-bedded, sandstone; pebble and granule lenses; minor basalt

Comments: sedimentary siliciclastic; synthesis of multiple published descriptions

Lithology: Sedimentary siliciclastic

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
- Econ Geol (1981) 76:556-567
Bolton, B. R., Frakes, L. A., & Cook, J. N. (1988). Petrography and origin of inversely graded manganese pisolite from Groote Eylandt, Australia. Ore Geology Reviews, 4(1-2), 47-69.
- Pracejus, B., Bolton, B.R., Frakes, L.A., and Abbott, M. (1990): Rare-earth element geochemistry of supergene manganese deposits from Groote Eylandt, Northern Territory, Australia. Ore Geology Reviews, 5, 293-314.
- Pracejus, B. and Bolton, B.R. (1992): Geochemistry of supergene manganese oxide deposits, Groote Eylandt, Australia. Economic Geology 87, 1310-1335.
- Econ Geol (1996) 91:386-401
- Tim Flannery (2007): Chasing Kangaroos: A Continent, a Scientist, and a Search for the World's Most Extraordinary Creature. [p. 208]

Mineral and/or Locality  
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