60% of the mineable gold is still in the ground in California. That's a stone cold fact. 7 year study released as Gold Resources in the Tertiary Gravels of California in 1968. That doesn't even cover hard rock deposits.
Hey Clay.. Do you know what methodology they use to come up with such numbers? If they know there is X amount, seems they should know where it is, or at least some
of it... And if I knew where that 60% was, I certainly wouldn't be writing a paper about it, I'd have my head stuffed in a hole somewhere...
My gut feeling from what little I know, those percentages that are left in the ground will grow as more knowledge is gained...
Where I've been digging the "events" were approximately 15 million, 30 million and 70 million years ago... But what happened 200million or 400million years ago

or longer..
Is there a 700million year old completely eroded volcano sitting in the middle of a corn field in Nebraska
Whats under the oceans

? Just fun stuff to think about. The appalacians used to be big mountains like the rockies.. Are there hidden placer deposits from erosion and
degredation of the mountains over 100's of millions of years sitting in virginia and pennsylvania
Then you talk about glacial gold that was moved with the last ice age, which was only about 12,000 years ago... What about the glaciers 250,000 years ago, what did
they move and where did they leave the good stuff? 2 million years ago

?
Fun to think about.. And the time frames are SO MASSIVE.