Boron, CA
The U.S. Borax facility in Boron, California, operates the state’s largest open‑pit mine, extracting one of the world’s most extensive borate deposits. The operation supplies roughly a third of global refined borate demand and has a history that dates back to the 1872 discovery of borates in Death Valley. Visitors can observe large mining machinery in action and learn about the company’s long‑standing use of mule teams and its current focus on sustainable practices.