Rio Tinto Chicago is a part of the Rio Tinto group, which operates US Borax in California. US Borax is the largest open pit mine in Boron, Calif., and supplies nearly half the world's demand for refined borates. The company's roots trace back to California's Death Valley in 1872, and it is known for its commitment to innovation, symbolized by the 20-mule teams used to haul ore out of the remote desert. US Borax is recognized as a world leader in borate technology, research, and development.
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