Make sure you get the mineral rights to the property. A low grade seam of coal under your property may not be profitable to strip mine now, but in a few years that may change.
In Kentucky and Tennessee there have been many reclaimed strip mines, some by state agencies, some by private companies such as the mines and timber growers, and some by both. Contact the state forestry service, wildlife resouce agency, and department of mines. Here is the state site for KY. http://kentucky.gov/Pages/home.aspx