First; What are the quantities of Gold allover the world either in
central bancks or in mines as reserves and the locations of these
miunes if possiple.
(Same like oil in the world). Second, I read in the newspapers that
more than 80% 0f the holding gold belonging to the national central
banks of all countries in the world are kept in the Fed Reserve bank
in US. Please clarify this issue

See related question:
http://answers.google.com/answers/threadview?id=589259

The New York Federal Reserve Bank offers a service to foreign banks
who want to store their gold in a stable, secure country. The United
States personally keeps and has kept for more than a century its
gold(the gold that used to back up the dollar) in Ft. Knox under the
protection of the army.