I found that farming ore is too time comsuming.
Find a vendor that sells it, buy them out, sell them something if you have somethign that will get your money back, then quick-save, attack them, quick-load and they have money and inventory back in full...

Rinse and repeat as long as you want to. Works great for grabbing ingredients too...

I use it for buying the following:
black soul gems (as well as the others) (Falion)
ingredients (anyone that is an alchemist)
ore/ingots/leather (any blacksmith)
building materials (any general sales vendor)