In comparison, each year 907 million metric tons of iron are produced worldwide. ... More than 90 percent of all gold ever used has been mined since 1848, when gold ... However, the current cost of extracting it is more than the gold is worth. ... When it was melted down, it produced 71 kilograms (156 pounds) of pure gold.
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90-tons-of-24-karat-gold-worth
Every year, governments increase their gold reserves by hundreds of tons. ... other countries' gold in exchange for dollars, it was reported that between 90% and ... 939c2ea5af
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