Olympic medals

Olympic medal compositions - 2016
Olympic medal compositions – 2016

If you’ve been watching the Olympics, you might have assumed that the medals given out are, as advertised, made of gold, silver, and bronze. Due to metal values, however, the reality is slightly more complicated. Giving out pure gold medals would be financially crippling for the International Olympic Committee, so unsurprisingly some compromises are involved. This graphic looks at the different metals used.

Gold Medals
Gold medals at the Olympics haven’t actually been 100% gold since the 1912 Olympics in Stockholm. Since then, they’ve actually been mainly made of silver, with a gold plating on top to give them the expected appearance. At the Rio Olympics, the medals are composed of 98.8% silver (with a purity of 92.5%), with the gold plating (of 99.9% purity) making up just 1.2% (6 grams) of the 500 gram medal. The gold content is notable in that it is entirely free of mercury impurities.
Compositions are variable at different Olympics; for example, at the London 2012 Olympics the gold medals consisted of gold (1%), silver (92%) and copper (7%). The value of the Rio Olympics gold medal, based on its metal composition, is approximately $565. Contrast this with their value if they were composed of pure gold: their current market value would be $21,200!
Silver Medals
The silver medals at the Rio Olympics are actually as advertised; impurities aside, they’re composed entirely of silver (with a 92.5% purity). This differs from the London 2012 Olympics, where the silver medals were 93% silver and 7% copper. Around 30% of the silver used in the Rio medals is obtained from recycled sources, including X-ray plates, car parts, and mirrors. The value of the silver medal based on the metal content is approximately $315.
Bronze Medals
According to the Brazilian Mint, who produced the medals for the Rio games, the bronze medals are composed of 95% copper (of 93.7% purity) and 5% zinc. At the London 2012 games, the composition was slightly different, at 97% copper, 2.5% zinc, and 0.5% tin. For the Rio medals, around 40% of the copper was sourced from recycled materials at the mint itself, using waste copper from their usual coin-minting processes. In terms of monetary value, the bronze medals are worth much less than both the gold and silver medals, coming in at just $2.38 using current market values.

Source http://www.compoundchem.com/2016/08/15/olympic-medals/
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