I'm not sure you need anything special. Ressources are determined by map level.
- Impure copper is found on maps lvl 5-14
- pure copper starts to appear on maps lvl 11, mixed with impure (you can find both, depending on where you dig)
- iron starts on maps lvl 20 if I remember well
- refined iron on higher lvl maps, then mithil, and so on.
So you can't find many diferent kinds of ore on a map, only one in general, sometimes 2 in specific zones, il all depends on the level of the zone, and your own level prevents you from accessing zones that are too high level for you.
Les Gibberlings, c'est des gob' tellement moches qu'y se cachent sous les poils.