Speak with Pilot Stonegear.
Pilot Stonegear loves his siege engine, as every pilot should! And he's always eager to find new ways to improve his tank's firepower!
He heard rumors of a rare ore and is looking for someone to hunt it down for him. If your boots are starting to itch, then find Stonegear at Steelgrill's Depot in Dun Morogh and see what he wants.