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Gold has been sought since ancient times, yet all the gold ever mined would fit into a single cube about 60 feet on a side. It was a sacred material to ancient people, and it's never lost its luster. Only a few natural elements have greater density than gold: rhenium, platinum, iridium and osmium. Like all elements, gold is an atom that gets its identity from tiny particles: positively charged protons in the nucleus, balanced by negatively charged electrons all around, plus neutrons, which have no charge at all. It's virtually indestructible, yet also soft and malleable.Where do nature's building blocks, called the elements, come from? Her job is to figure out how much gold is in them there rocks. I don't see any more rocks in here, but the bad news is, I don't see any gold in here, either. Final steps: cool and clean the bars, stamp them with their unique serial numbers and their weights. The ancients first learned how to heat rocks to extract copper, at least 7,000 years ago. Traders in New York, London and Shanghai buy and sell more than 20 million tons a year. Copper has been prized for millennia for its unique properties: it conducts electricity better than any metal except silver; it's malleable and has a moderate melting temperature; it even scares away bacteria. Even with all the other modern materials available, they still choose bronze. Hasn't something better come along, after all these years? The quality of the sound depends on the atomic structure of the material.
I brought you a couple of hunks of bronze, uh, one of which was knocked off of a bell when it was done and one of which is un-poured. I need an area about the size of a farm, and you've given me the whole of the United States. It's too small for us to see, so we have to mount it on a carrier grid, so we can handle it. Like, like, for one thing, I notice they're really, really grid-like.Using cyanide to react with the gold allows them to gradually reduce 40,000-gallon tanks of pulverized sludge to this: three trays full of mud? This is the first time an outsider has been allowed to pour gold. I'm not sure they entirely know what they are doing, but they are going to let me pour the gold into a gold bar mold. They'll have to throw it away or just let me take it home in my luggage. Once he removes the aluminum and joins the two halves, a bell-shaped space remains on the inside, ready to accept the molten bronze. That's a, that's a mixture, actually, of 80 percent copper and 20 percent tin. A blow causes the atoms to vibrate, but the tin prevents them from moving too far out of position.