How about a non-taxable trust fund to benefit the coal miners and workers who provided us with the fuel in the first place?
I'm guessing that having all that money would alter most folks in an unfavorable way. Sure, keep some for yourself, family and friends, but just being wealthy doesn't make you a descent person. We all know many folks with a HUGE portfolio; some are wonderful, others........nuff said.
You would be lonely on the mountaintop retreat after a while; watching the waves crest on the beach; flying or yachting all over the world; hosting an never ending party......
It may not be the perfect place to live for everyone, but I REALLY enjoy it right here in the USA!
PS: I'd start a coal yard and boiler/stove/rehab sales center and make jobs for folks. Perhaps earn a living from it too!