I have a route I run in Alterac that gives me pretty decent Iron, slightly less Mithril and occasional Silver, Gold and Truesilver. It starts just as you leave Hillsbrad and winds around the mountains. Mostly Yetis and Ogres there. And few caves that I can pick up veins from the outside and decide if I want to go in. I find if I make my circuit riding my mount the veins have started respawning by the time I get back to the beginning.
Also you could check out the mining guide that is in this subject.
Edited, Sun Oct 2 15:27:00 2005 by WoodMutt
Edited, Mon Oct 3 11:03:55 2005 by WoodMutt