I think i know which level you're on, i had the same problem. Just have to take over the nearby towns and take all their ore i think. Sucks a bit having no ore.
I completed the game on Saturday and didn't actually get a wonder until the last level and even then only used it once (Siren) on about 50 troops. Save up for the earthquake (800,000 i think) or volcano (1,000,000 ditto), they're both awesome

The penultimate level gives you loads of tribute, i didn't have to do any battling at all (lowered my evilness from 90% to 40% in one level! w00t!).
Will definitely start the game again with another creature and try and be good, the evil hand and textures was/were quite depressing after a while. I want trees and stuff to be green not brown