The Wizards probably don'y do anything like that for simple gains like that. After all if things go wrong they could die in nasty nasty ways. It probably is still much easier to just dig the stuff up.
Anyway im sure the economy is based around something else anyway, like warpstone or stuff that isn't covered in warpstone. Even with the Lore of Metel possibly screwing things up you also have the dwarves hoarding the stuff.
Anyway im sure the economy is based around something else anyway, like warpstone or stuff that isn't covered in warpstone. Even with the Lore of Metel possibly screwing things up you also have the dwarves hoarding the stuff.