Coromandel Watchdog of Hauraki is challenging the New Talisman gold miner's claims that it is feasible to mine the conservation land on Mt Karangahake.
Spokeswoman Augusta Macassey-Pickard said conservation land was for all New Zealanders, not for mining.
"It's that simple," she said.
"We will do whatever we can to support the Karangahake community as they work to protect the mountain from this desecration, to protect our conservation land.
"Our conservation estate is not for sale. It belongs to us all, and it is not acceptable for the Government to permit companies such as this to compromise it so that those companies can profit at the expense of all New Zealanders.