The 2012 gold is 92.5 percent silver, 1.34 percent gold, and 6.16 copper, with IOC rulesspecifying that it must contain 550 grams of high-quality silver and 6 grams of gold. The resulting medallion is worth about $500. For the silver medal, the gold is replaced with more copper, for a $260 bill of materials.
The bronze medal is 97 percent copper, 2.5 percent zinc and 0.5 percent tin. Valued at about $3.
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