I've been wondering about the effect on the ground water at reclaimed strip mines. I know the surface can look the same especially if it was farmed before. Anybody ever try to drill a water well on reclaimed land?
I have gone swimming in stripper pits, back in the bad old days before they filled 'em in. I can tell you this: we were not bothered by mosquitoes. The pH of the water was about 2.0 by my guesstimation. It was green, not from algae but from FeSO4, and nothing grew in it.
Wasn't it unpleasant swimming in that sour water?