The rugged West Coast of Taranaki is iron sand country, black and beautiful stuff.
It is also very valuable to the steel manufacturing industry and mining company, Trans-Tasman Resources has been granted the right to mine 50 million tonnes of iron ore every year for 35 years, just off the coast of Patea.
But there's fierce opposition. Dr Athol Steward of Whanganui and his son Jono are walking the 400km from Raglan to Whanganui to protest against the approval to mine the seabed.
"Experimental seabed mining is not okay, and we need as many New Zealanders to know that to dig up our ocean is just not on," he said.
Dr Steward is more familiar with walking the corridors of the Whanganui Hospital, but for the last two weeks he has been walking a strip of the West Coast.