Contact Us

We’re here to help with your industrial boron needs.

Have general comments or questions?

Office locations

Learn more ›
Americas

Rio Tinto | U.S. Borax
200 E. Randolph
Suite 7100
Chicago, IL 60601 USA
+1 773 270 6500

Asia-Pacific

Rio Tinto
12 Marina Boulevard
#20-1, Marina Bay Financial Centre, Tower 3
018982
Singapore
+65 6679 9000

EIMEA

Rio Tinto Borates
Alfred-Herrhausen-Allee 3-5
65760 Eschborn
Germany
+49 6196 96 00 61

U.S. operations

Boron
U.S. Borax
14486 Borax Road
Boron, CA 93516 USA
+1 760 762 7000
Learn more ›
Wilmington
U.S. Borax
300 Falcon Street
Wilmington, CA 90744 USA
+1 310 522 5310
Learn more ›
Borax Visitor Center

14486 Borax Road
Boron, CA 93516 USA
visitor.center@riotinto.com
+1 760 762 7588
Learn more ›

Payroll and benefits
Are you a current or former employee with HR, payroll, and benefits questions?
 
Call the help desk at +1 888 448 3375
Employment Verification
Are you an external party that needs to verify someone is employed by U.S. Borax?
 
Please call +1 801 363 4357

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.

Copyright © 2024 Rio Tinto. All Rights Reserved.
Terms and Conditions Privacy and Cookies Modern slavery statement
Cookie Preferences