Found a link the other day for a picture where a guy mapped most of the rich iron and plat nodes. Really good to park some alts by them each day and get some of that infamous iron and platinum ore. http://i.imgur.com/YeOTMUR.jpg
http://www.reddit.com/r/Guildwars2/comments/1uyqso/permanent_rich_iron_and_platinum_locations/
over by the waypoint in dredgehaunt cliffs near the grey roads area (north waypoint) there are 2 rich iron nodes within 30 seconds of each other. However the 2nd waypoint does have several dredge lurking around it.
