How do I do due diligence on formerly mined property?

[Marcus Brown]

Greetings, I just received a call from a seller who owns several dozen acres in Walker County, AL. He hasn't been to the property but thinks it may have been mined and reclaimed at some point, and it looks like there's mining activity in the area. What do I need to know when checking out land like this when it comes to environmental and usability concerns?