[killerschlumpf]

- Have you installed the latest official patch? If not try this but it won't be save game compatible.
- Leave the location and sleep a day perhaps now they're there.
- Load an older save game and look if the bug happens again.

Mithril Ore can be found in the Dredge (Wheel Clan) or in Quintarra (-> don't know the name of the Shopkeeper).
If I remember correct you can buy Dwarven Steel by Dwarven Smiths, try the one in Tarant.