In blackwing lair the technician's drop the Elementium Ore. If you really need some ore and your guild is willing to farm it. All you have to do is kill the goblins then reset the pack by not killing the warlock's. When that happens the warlock's will run back to their spawn spot and the goblins will respawn. This works because these pack's are linked, so need to kill all of them for the whole pack to be gone. My guild got 10 elementium off 1 pack doing this for about 3hours.