Australia's biggest gas project, Woodside's North West Shelf, has received final approval to extend operations through until 2070.

Environment Minister Murray Watt has placed 48 additional conditions on the project, aimed at protecting nearby ancient Indigenous rock art.

These include reducing certain gas emissions by 2030 and reaching net zero emissions by 2050.

The announcement comes almost four months after the minister provided Woodside 10 days to respond to his provisional approval for the extension.

As part of separate court action brought by a traditional custodian, the minister also made a partial declaration to protect a significant heritage site adjacent to the Karratha Gas Plant containing the ancient Murujuga rock art.

The ruling brings additional legal protections to part

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