As to the mass of gold available in the earth's crust - there has been quite serious scientific speculation about a recent gold quarry and how gold is being leach-out of some pretty gold-free rocks. Something to do with the suddenness of finding gold in one spot in Java or Borneo or that area. And it's abundance (relative term). Hot steam and pressure from really deep down was the conclusion.

Whatever - the price of gold reflects the nervousness of money markets. And is producing just the same over-confidence in what is just a very heavy, untarnishable noble metal. Heavier than lead (density wise) in case you didn't know it.

When money can be made from money - gold will find a lower level. But for now it is safer than houses - or loaning money out.