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Which Montana city was once known as the 'Richest Hill on Earth' due to its massive copper mining operations?

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Correct answer: Butte

Butte was a major mining powerhouse in the late 19th and early 20th centuries, supplying a huge portion of the world's copper. This intense industrial past left behind the Berkeley Pit, a massive former open-pit mine filled with highly acidic water. Photo: WikiCapa (talk) (Uploads), Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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