9 tons of gold? Seems like it might be worth a bit more than 400 million, especially with inflation an all.
So $400M is pretty close.
A few years ago the Nashville treasure(never been found) was estimated to be worth around 500 million. Bob Brewer claims to know the location of the Arkansas treasure but refused to disclose the location partly due to the fact that the feds would take it all just like the white sands treasure.