China Win First Gold Medal London Olympics 2012

Yi Siling of China wins XXX London olympics 2012 1st gold medal womans shooting 10 meter air rifle on 28 july 2012 her 1st olympics. Polska wins 1st silver, and yu dan of china gets the 3rd position bronze. polands sylvia bogacwa gets thanks to ESPN

This year's Olympic gold medal is comprised of 92.5% silver, just 1.34% gold, and the remainder 6.16% is made up of copper.

The gold and silver medals weigh 412 grams, while the bonze weighs 357 grams. Each medal is 85mm in diameter, and 8-10mm thick. These are the biggest and heaviest medals ever produced for the Summer Olympic Games

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