Keane has seen how these miners use mercury up close at various sites in Asia, Africa, and South America. The process varies, but its essence is this: pour a puddle of mercury into a pan of crushed rock. Mix it in, and any gold bits in the crumbs will stick to the mercury to form a silvery blob known as an amalgam. Roast the blob with a blowtorch, and the mercury evaporates to leave the gold behind.
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