It's good to see so many groups banding together to oppose mining the South Taranaki seabed, Kiwis Against Seabed Mining chairwoman Cindy Baxter says.
The groups will be heard in the Wellington High Court from April 16-19. They include iwi, conservation and fishing interests.
They are appealing against the Environmental Protection Authority's August 2017 decision to give mining company Trans-Tasman Resources consent to mine iron-sand offshore from Patea.
The consent was narrowly granted. Two of the four-member decision-making committee opposed it and chairman Alick Shaw used his casting vote to grant it.
The hearing will be before High Court Justice Helen Cull, and can only be on points of law. Ms Baxter has about 15 points of law ready for Kiwis Against Seabed Mining (KASM)'s lawyer Davey Salmon to make.