Lisel, the technician who maintains the Moon Towers of Ardoris, offered me a reward for any silver ore I bring back to her. I should be able to find silver ore through mining any mineral deposit within the vale, though it can be rare.
UPDATE: Lisel no longer needs silver.
Lisel offered me 30 gold for one piece of pure silver. She uses it as a component in much of the machinery at Moon Tower. I haven’t found any silver yet. I am more of a skinning type a guy.