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Which historic site in Lead, South Dakota, was the deepest and most productive gold mine in North America?

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Correct answer: Homestake Mine

The Homestake Mine yielded more than 40 million ounces of gold during its 125 years of operation. Today, the massive underground shafts have been repurposed into the Sanford Underground Research Facility, where scientists study dark matter and neutrinos deep beneath the earth. Photo: Schwerdf, Wikimedia Commons, CC BY 4.0.

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Source: Wikipedia (CC BY-SA)

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