dark iron ore, where to smeltFollow

hello my fellow gamers, i am stuck with almost 40 dark iron ore, this stuff is taking up room in my pack and bank space, i need to find where to pick up skill to smelt it, i know its somewhere in black rock depths, and more info would be nice. ccrom- lightbringer server

One of the ghosts in the room before you fight all 7 gives the quest to learn how to smelt it , can only smelt it by the black forge next to molten core entrance.