Mining company Trans-Tasman Resources is appealing the High Court decision which removed its consent to mine iron sand from the South Taranaki seabed.
The High Court decision was released on August 28, and follows consents granted the previous year by the Environmental Protection Authority (EPA).
The consents were appealed by several groups representing environmental, iwi and fishing interests.
Trans-Tasman Resources (TTR) wants consents to suck up 50 million tonnes a year of iron sand from the seabed 22-36km offshore from Patea, for a period of 35 years.
It would ship 5 million tonnes of iron-rich material to Asia each year, returning the rest of the sand to the seabed.