Hi Don Jose de La Mancha;
Some of the nuggets I've seen on eBay might be from a mine like you mentioned. There are some that have a very noticeable red tint to the gold, likely due to iron and others that seem to have an unusually light "gold" color, possibly alloyed with silver, or platinum. I do find that the prices on eBay are rather low right now and it might have something to do with the person I heard about on the news a couple of weeks back, who was selling fake gold bars. Either that, or people just don't think the price of gold is going to stay up there for much longer. Personally, I think it will stay above $670 U.S. and maybe go higher into the low $700's by the end of the year.
F.