It would be important to determine what the quality of the material is, and if there is the possibility of encountering more material by further exploration. Are you looking to mine it for gemstone production? Industrial use such as abrasives? If the corundum is gem quality then you've got some real potential. If you can provide some more information, such as details on the corundum (color, habits, transparency), as well as the environment (i.e. is it a marble outcrop? Any other minerals? What locality/geologicial formation is it in?) that would be helpful.