A few years ago, I met up with some of the guys, and we hiked out to visit the ruins of the old Corkscrew Borax Mine. The mine was worked for colemanite (an ore of borax) in the 1950s by the US Borax Company. Surprisingly, for all of its development, it was only productive for a few years.
The NPS has gated the mine, and the beautiful ore bin is fenced. Please respect this interesting bit of history.