Compostion of the Earth's Crust:- Oxide Percent ************* SiO2 - 59.71 Al2O3 - 15.41 CaO - 4.90 MgO - 4.36 Na2O - 3.55 FeO - 3.52 K2O - 2.80 Fe2O3 - 2.63 H2O - 1.52 TiO2 - 0.60 P2O5 - 0.22 ****************** Total - 99.22 * ****************** All the other constituents occur only in very small quantities, and total less than 1%, which includes the impure form (ore)of Gold(Au).

Pretty much all the gold that is found is found on earth. :-) There's gold elsewhere, but we haven't got there yet.

1) "More than 99 percent of Earth's gold is missing—it all sank to the center of the planet billions of years ago. In fact, says geologist Bernard Wood of Macquarie University in Australia, there's enough gold in Earth's core to coat its surface in 1.5 feet of the stuff. [...] Wood has calculated that 1.6 quadrillion tons of gold must lie in Earth's core. This may sound like a lot, but it is really only a tiny percentage of the core's overall mass—about one part per million. The core holds six times as much platinum, Wood notes, "but people get less excited about that than gold."" Source and further information: http://discovermagazine.com/2006/sep/innerfortknox 2) "Only one out of a billion atoms of rock in Earth's crust are gold. (If expressed by weight abundance, it is five parts per billion, but by numbers of atoms it is about one atom of gold per billion.) Oceans are the greatest single reservoir of gold at Earth's surface, containing approximately eight times the total quantity of gold mined to date. However, the current cost of extracting it is more than the gold is worth. " Source and further information: http://www.amnh.org/exhibitions/gold/eureka/funfacts.php

there is aproximately 525,000 M/T of gold in and on the earths crust. many peoeple have tryed to stte a value and the biggest mis-calculation that i have seen has been in the fact that there are 32.105 troy ounces in a Kilo and only 1000 kilos in a metric tonnes. that mean that a M/T at today prices of around 800 USD per ounce would be 1 MT = 1000 Kg = 32105 oz/T * 800 USD =$25,684,000 USD that means the cash value of the roughly 425,000 M/T would be $10,915,700,000,000 the other 100,000 M/T is still yet to be mined at an annual production currentky of 2,500 M/T.