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Rio Tinto, Spain
Spain’s Rio Tinto river conjures up images of what a river might look like on some alien world that future astronauts had turned into a mining colony. For thousands of years, generations of miners have dug shafts into the local soil in pursuit of mineral wealth. The Romans fashioned some of their first coins from the Rio Tinto area’s gold and silver, and today, the area is one of the most important sources of copper and sulfur on the planet.
