Thanks for the fast response.
We were there last night after some searching about this led us there, but neither of us got any on either floor after spending at least an hour on each floor. Are there any monsters there in particular that we should be looking for?
Just a tip for anyone else who's working on this quest...if you go to BurningStone Clan's Mine the dwarves there drop them, also. It's time consuming, even with two people, but they do drop.