Boron, United States of America
The Rio Tinto Boron Mine (formerly the U.S. Borax Boron Mine) in Boron, California is California's largest open-pit mine and the largest borax mine in the world, producing nearly half the world's borates. Ore reserves are sufficient for current economic production through the early 2040s. It is oper
ated by the Borax division of the Rio Tinto Group.
Listen to the audio guide for Rio Tinto Borax Mine Visitor Center Free on WIP — starts by itself when you arrive, even with the screen off