USGS Frequently Asked Questions
Question:
How much silver has been found in the world?
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Answer: Of the 1,740,000 metric tons of silver discovered to date, 55% is found in just four countries on earth. All the silver discovered thus far would fit in a cube 55 meters on a side.
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Source of this FAQ: http://minerals.usgs.gov/west/factfaq.shtml
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