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I know, it's an ancient question, but maybe somebody might still be interested in some ballpark estimates. According to the World Gold Council about 200,000 tonnes of gold have been mined in human history. Most of it in the last 70 years. Almost half of it exists in form of jewellry. The best estimates currently available suggest that around 197,576 tonnes ...


6

Yes, for limited applications. Archimedes's famous "Eureka!" moment stems from being tasked with determining if a crown was made of pure gold or if some silver had been mixed in. The density of gold was known, so he could confirm the gold's purity from its density. The crown's weight was easy enough to measure, but he needed to know the volume of ...


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