About Us

We're on the forefront of borate technology,
research, and development.

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. From the very beginning, we have been on the forefront of borate technology, research and development. We supply 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles. Our customers rely on boron and borates to create an extraordinarily diverse range of products essential to life and to modern living.

Customer values

Technical support for customers, product quality, and supply reliability are the pillars of our commercial commitment.

We operate mining, refining, and shipping facilities on four continents with a commitment to:

  • Cutting-edge research and development
  • World-class safety, environmental, and community practices
  • Constant innovation and improvement
  • Maintaining a global network of sales offices and stock points

Locations

What began as an underground mine in 1872 is now California’s largest open pit mine with one of the richest borate deposits on the planet that supports a global network of operations and offices.

Europe



 

Asia



 

Careers with U.S. Borax

Looking for a career that matters, with a company that cares?
Mules at the parade
 

Commitment to Our Communities

Our communities—both those where we operate and those we serve—are a priority for us. In Boron, California—our home since 1872—we maintain the Borax Visitor Center, which provides community education about borates. We also team with area leaders to support local nonprofit organizations through the Borax Visitor Center Foundation. And, we encourage all our employees to take an active role as volunteers within their home communities.

More About U.S. Borax

Pozzolans from Mine Waste to Decarbonize Concrete
CR Minerals Company, LLC has reached an agreement with Rio Tinto on the production of pozzolans from waste materials at the U.S. Borax facility in Boron, CA. Read More
U.S. Borax Recognized as Supplier of the Year by Owens Corning
U.S. Borax’s sales and logistics team attended Owens Corning’s annual supplier recognition event where we accepted two awards: Supplier of the Yea... Read More
A Tradition of Transportation Innovation
From the iconic 20 mule teams to railroads to the first renewable diesel-powered trucks, U.S. Borax helped redefine transportation and logistics in boron mining. Read More

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 650 customers with more than 1,800 delivery locations globally. We supply around 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles.  Learn more about Rio Tinto.

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