When you have a comet or meteor hit a chunk of Big Ice it's going to 'splode like nobody's business in SECONDS.
It would excavate a great mass of the underlying earth ~ rocks, dirt, gold bearing sands (quartz and otherwise), and everything else.
That mass would go flying out for thouands of miles and come down where it could be found later and "mined", ploughed under, or whatever.
My theory is that there was enough recoverable gold in the debris that the debris was mostly dissipated and destroyed as evidence even in Paleo-Indian times, and certainly by Spanish and other European gold hunting periods. That gold was sent to Europe for the most part after the Spanish conquest.
This stuff shouldn't be all that deep ~ hence the easy access.
The goldbearing region in Virginia was REVEALED by a larger asteroid that hit the DELMARVA peninsula several million years back. That is different ~ and explains why all the gold in Virginia and south into the Carolanas is kind of along the Fall Line!
Then too there is that pesky Tsunguska “impact” that left no crater yet blew down trees in a 60 mile radius. This and many other conundrums can be easily solved if one assumes that the incoming comet/meteor was carrying a hugely different static electrical charge that arced to earth before impact with enough force to vaporize the object and knock over the trees without digging a crater. But associating electricity with objects in space is taboo, let’s just keep calling the solar electric current the “Solar Wind”.
www.thunderbolts.info
http://sites.google.com/site/dragonstormproject/