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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?

US Borax Safety

Our Commitment to Safety

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Join U.S. Borax 

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

Multi-Materials Expert Allen Zheng Blends Passion with Purpose
Products critical to modern life are often made with multiple materials and compounds. That’s why it’s important to have experts such as Allen Zhe... Read More
New Lab Reinforces Commitment to Customer Assurance
We're excited to announce a new lab building is officially online at Borax Français in Coudekerque. The lab enables better customer support and advances r... Learn More
From Apprentice to 1st Class Electrician
Elizabeth (Liz) Stone, a graduate of this year’s California Borates Instrumentation Electronics (IE) apprentice programme. Liz recently became a 1st cla... 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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