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Researchers in Switzerland have developed a process to manufacture "gold nuggets" using a plastic matrix with embedded gold nanoplatelets: https://ethz.ch/en/news-and-events/eth-news/news/2020/01/gold-nugget-made-of-plastic.html

I've been reading some old (late 19th century) newspaper articles in trove about gold mines, and can't get over how detailed they are in terms of revealing yields, depths and other information that I (in the 21st century) would have thought would be proprietary secrets. Why did old timers, and...