South Taranaki and environmental groups are celebrating a significant victory in the High Court.

The High Court has quashed an EPA decision allowing seabed mining exploration.

Ngāti Ruanui and the community of Pātea have been opposing seabed mining for a while.

Debbie Ngarewa-Packer, the kaiarataki of Ngāti Ruanui says the High Court ruling proves two things.

"EPA got it extremely wrong and Ngāti Ruanui got it extremely right."

The High Court at Wellington announced that it will not allow trans-Tasman resources to mine iron sand off the South Taranaki coast.

And it's a decision Ngarewa-Packer says that they're prepared to defend.

"This is the first time it's come out from the High Court; our view is it would be extremely foolish and wasteful for their TTR shareholders to continue this battle."

Co-leader Marama Davidson says the Green Party is celebrating their victory.

"Me mihi kau ana ki a Ngāti Ruanui me ngā rōpū katoa, ngā rōpū tiaki taiao katoa i mahi tahi rātou ki te whawhai, he tino wīni tēnei."

Davidson says the Greens supported the Pātea community because as the community wanted to establish a marine sanctuary.

"I tērā tau i haere mātou o te rōpū Kākāriki ki te mau ringaringa me Ngāti Ruanui me te hapori, ngā mana whenua ki te whakatū he wāhi rāhui hei wāhi haumaru mō ngā kararehe o te moana."

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