Yes, there is probably something going on that’s driving that interest. @user110, if you know a landman operating in your area (where the minerals are located), that could be a great resource. Attorneys can be great resource and help you consider things from a legal perspective and understand the forms that get presented to you and the implications of your choices. It might be wise to consult an accountant too, in the event that you decide to sell, to understand and explore options for how it might impact your tax status/situation, and ways that you can structure a deal so that you don’t give away more than you have to in taxes.