Yes, the hill is natural. There are several hills that look like that around here.

No mineral production on the property now or in the past and nothing in the immediate vicinity. The seller does want to retain mineral rights but I'm going to try to get at least 1/2 of whatever he has (he doesn't actually know if he even has any mineral rights actually)

The topographical map doesn't show any mining activity and they are usually pretty good at that.