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Kennecott going underground

Mining giant Rio Tinto has approved US$55 million in development capital to start underground mining and expand production at its Kennecott copper operations in Utah.

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Rio Tinto's Kennecott operation in Utah

Kennecott, just outside Salt Lake City, has been operating since 1903 and the Bingham Canyon pit is the world's largest man-made, open pit excavations in the world, visible from space.