Who owns the mineral rights for your property? The mineral rights owner might not be the same as the land ownership.

How Can I Locate Who Owns the Mineral Rights Under My Land?
http://www.mineralhub.com/2010/04/how-can-i-locate-who-owns-the-mineral-rights-under-my-land/

Land and Mineral Ownership (BLM-Eastern United States)
http://www.blm.gov/es/st/en/prog/lands/00.html