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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're finding better ways to provide the materials the world needs. U.S. Borax supplies 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. 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

Customer meeting with graphs and charts

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.

North America



 

Europe



 

Asia



 

Careers with U.S. Borax

Looking for a career that matters, with a company that cares?

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Our Commitment to Safety

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US Borax Careers

Women in Mining

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

U.S. Borax becomes first open pit mine to transition to renewable diesel
Rio Tinto has successfully completed the full transition of its heavy machinery from fossil diesel to renewable diesel at its Boron, California operation, mak... Learn More
Meet Frank Wawrzos, Technical Expertise Meets Superior Sales
Over the course of his 30-year career, Frank Wawrzos has merged technical operations with marketing and sales to spearhead innovation. Learn more about our ne... Learn More
Rio Tinto Trials Renewable Diesel at U.S. Operations
Rio Tinto has successfully completed a renewable diesel trial at its U.S. Borax mine in Boron, California, and is now conducting a second trial at the Kenneco... Learn 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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