Mine landscape


The Northern Territory is a world leader in manganese production, with the world’s largest and lowest cost manganese mine on Groote Eylandt, and another operating mine at Bootu Creek.
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Total production
135.4 million tonnes of manganese ore and concentrate
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2019/20 production
6.3 million tonnes
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Remaining JORC resources
167 million tonnes of manganese ore
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Value of production in 2019/20
$1.61 billion
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Production ranking in Australia

Manganese is currently the largest contributor to the Territory’s mineral production value.

Read the Manganese factsheet PDF (1.6 MB)


For more information visit Groote Eylandt mine

Remaining JORC resource: 156.4 Mt @ 41.92% Mn

The Groote Eylandt manganese mine has been in operation since 1965, and has produced more than 115 million tonnes of manganese ore and concentrate to June 2018. The mine is operated by the Groote Eylandt Mining Company Pty Ltd (GEMCO), which is majority owned by South 32 Ltd.

The ore is mined by shallow open-cut mining methods and is transported by road to a nearby port. Production in 2018/19 totalled 5.58 Mt of manganese ore. The deposit comprises oolitic and pisolitic sedimentary manganese within the Cretaceous Carpentaria Basin.

For more information visit Bootu Creek mine and OM Maganese.

Remaining resource: 10.03 Mt at 16.51% Mn

The Bootu Creek mine is 110km north of Tennant Creek and commenced operation in 2005. The mine is operated by OM Manganese Ltd, a subsidiary of Singapore-based OM Holdings. In 2019, production of manganese concentrate (lumps and fines) totalled 0.57 Mt.

A Tailings Retreatment Plant at Bootu Creek is expected to be commissioned in 2019 and will produce ~250,000 tonnes of manganese fines per annum for eight years. The deposit is a hydrothermally modified sedimentary deposit hosted in Palaeoproterozoic rocks of the Tomkinson Province.


In January 2019, an exploration licence covering part of Winchelsea Island, off the northwest coast of Groote Eylandt, was granted to the Winchelsea Mining Pty Ltd, which is a joint venture between the Anindilyakwa Advancement Aboriginal Corporation (AAAC) and AUS China International Mining.

Further potential for sedimentary hosted manganese occurs in relatively unexplored regions of eastern Arnhem Land, along the western margin of the Carpentaria Basin, where manganese was precipitated during a Cretaceous marine regression on coastal terraces and troughs.

Sedimentary or secondary manganese deposits are also present in the Amadeus Basin (for example, Wangatinya), McArthur Basin (for example, South Rosie Creek), Georgina Basin and South Nicholson Basin.

More information

  • Ferenczi 2001. Iron Ore, Manganese and bauxite deposits of the Northern Territory. NTGS Report 13

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