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Commonwealth act
This law controls who can explore for and mine non-petroleum minerals (things like sand, gravel, coal, limestone, and other naturally occurring substances) from the seabed beyond Australia's coastline — specifically from 3 nautical miles offshore out to the edge of Australia's Continental Shelf (the underwater extension of the Australian landmass).
Petroleum (oil and gas) is explicitly excluded — that's handled by separate legislation.
A key feature is the shared governance arrangement between the Australian federal government and the states/territories:
The Northern Territory is treated the same as a state for all purposes under this Act.
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Direct links to the current provisions in Offshore Minerals Act 1994.
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View on official registerSourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.
You cannot explore for or mine offshore minerals without a licence. Doing so attracts a penalty of 300 penalty units. There are four types of licences:
There is also a Special Purpose Consent for minor activities like scientific surveys or collecting small mineral samples.
The Act applies to offshore areas adjacent to all Australian states and several external territories including Ashmore and Cartier Islands, Norfolk Island, Christmas Island, Cocos (Keeling) Islands, Heard Island and McDonald Islands, and the Coral Sea Islands Territory.