County office that records deed will be able to provide this info. for you.

Go to either your County Tax Appraisal Office OR the County Records Office where are the deeds to the properties in that county are kept. It will take a little investigating, but you can most anything out about your property all the way back to the undeveloped raw land. As Janine stated, the developer POSSIBLY has the minerals, but more probably not. Now that I live in North Texas, RIGHT IN THE MIDDLE OF THE BARNET SHALE ACTIVITY, I have found that the ORIGINAL land owner keeps these rights just because.

The deed to your property should tell you. If you are in a deed restricted subdivision, mineral rights don't usually transfer over to you, the developer normally keeps the rights if he obtained them when purchasing the land.