by Maywalk » Wed Oct 13, 2010 12:20 pm
Just found this on the net Mo. It might explain your query.
Real Gold Medals
The last Olympic gold medals that were made entirely out of gold were awarded in 1912.
The Medals
The Olympic medals are designed especially for each individual Olympic Games by the host city's organizing committee. Each medal must be at least three millimeters thick and 60 millimeters in diameter. Also, the gold and silver Olympic medals must be made out of 92.5 percent silver, with the gold medal covered in six grams of gold.