Quarry - A quarry once for gravel is now Mann Co.'s oil well When the brothers died, they left a Quarry used to mine gravel. Saxton Hale, using his magnificent fists, decided to dig a deeper hole when he acquired the property. Lo and behold, he struck "black australium" (oil) from the depths of the mine. Now, the old gravel quarry stands as a secret base for Mann Co and its main oil producer. The throne of the "gravel king" still remains intact from the brothers' reign.