how many grams of gold can you extract from gold mined rocks

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    I was also interested about the monetary value of gold. One Troy ounce (31.1 grams) of gold costs about $1,660 (March 17th of 2012). So, one kilogram of gold costs $53,370. In every year, about 2,500 tons of gold is mined. Its monetary value is therefore more than 133 billion dollars. This is 0.21% of the GDP of the whole world.

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