![Billie Mine—Death Valley, California, USA (borates) Billie Mine—Death Valley, California, USA (borates)](https://www.agapito.com/wp-content/uploads/bfi_thumb/dummy-transparent-qpk3ecabg80yhjvwqpy0gvpopz3xg0gi3kj6rcz6i4.png)
Billie Mine—Death Valley, California, USA (borates)
American Borate Company The Billie Mine utilized long-hole stoping with backfilling to extract borate. This mining method resulted in the creation of tall, narrow pillars which were critical to [...]