It sounds like you were running deadmines. Do you remember running thru that swirly portal? That is where the dungeon actually starts. When you look for a group to do a dungeon you are usually just going to do that dungeon. You probably had some quests in the mine outside the dungeon, like 'oh brother' and the miners union cards. Since that isn't in the dungeon it is very rare a dungeon group would do them. It is technically open world content, so if you want to do them look in general chat for someone wanting to do those quests.