in my area I see piles of river rocks that the miners made,,,, there are hydrolic mines, I just need to see HOW the piles of rocks got there and HOW they were mining the au out. I'm not talking about the large bucket dredge piles but smaller ones,,,, I think I could hunt it better if I knew the process,,,, andy info you can give me or point me to would be nice,,,, Thanks,,