So, I remember hearing legends and tales of gold from the Yellowstone area, and it makes sense, I mean, talk about a geologically active area. I also remember hearing tales of lost gold in the area too, of a chest of gold that's sunk in a swamp. As well, I've heard whispered tales of fantastic panning with rangers catching people in the act and telling them to dump the contents back in the streams.
As with any legendary tale, I have no idea how much is true, but it's fun to think about. (I've never been prospecting in a National Park, and am in no way recommending anyone try by the way.)
All the best,
Lanny