The Blood Stone Mines was a locale in Outworld which was originally meant to appear in Mortal Kombat 4. The picture and concept sketch of this scrapped arena can be found within the Krypt and Kontent gallery special features of Mortal Kombat: Deadly Alliance.
Giant Drill Bits drill into the depths of the lava valley below to harvest the precious blood stones. In this mining factory, there is a floating Telsa drill and a giant Auger drill bit. The pig head-like gargoyle structure above the door would blast fire from its snout.