Trans-Tasman Resources has been given leave to appeal the overturning of its seabed mining consent.

Leave was granted by the Court of Appeal last week, following an application by the mining company in September.

TTR is seeking to mine ironsand in the South Taranaki Bight, and it applied to the Environmental Protection Agency to take 50 million tonnes of ironsand a year from the seafloor between 22 kilometres and 36km off Patea to export to Asia.

The agency gave its consent in 2017, but opposition groups of environmentalists and iwi appealed that decision to the High Court which quashed the consents in August this year.

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This week TTR said its appeal would be based on the view that the agency followed a legally correct approach in granting the consent to TTR, including conditions specifically designed to protect the marine environment and existing interests, particularly iwi.