Talk to Talib; there is a cut scene where Cornelia asks your help to get a Zinc Ore for her friend Parraggoh and hints that you can get them from monsters in Gustaberg. Accept the quest and Talib will agree to take the Ore from you when you get it.
If you declined the quest you can start it by talking to Parraggoh.
(Optional) Talk to Talib again and he explains that Cornelia is making the ore delivery for Parraggoh who was injured and can't do it himself. He also tells you where you can find Parraggoh.