Stolen Ore / Nuadas Silver ProblemFollow

Hello. I am a Fian (is that the same as Ranger ?) Lvl 21 and I am working on this Stolen Ore / Nuadas Silver Quest.

My Problem is: I got the silver Arrow, the Hillhound fur (or something like that) and this powder to Dera in Mag Mell. She thanked me, and I got about 900.000 experience points, but no special item. Right after that, I was teleported to Connla.

I looked in my quest notice and all it said (roughly translated from german): "Dera thinks that it's the same silver that was used for Nuadas hand. She thinks that there has to be an entire mine, where this kind of silver can be found."

That's it. What do I have to do next ? I know, there is something about a giant (I found that out after some google search), but why have I been teleported to Connla ? Why doesn't my quest notice tell me what to do ?

Thanks in advance.