Processing works of Pine Creek Tungsten Mine (also vanadium), at about 9000ft above Rovana, Inyo County CA.  Mine shafts mainly high up in valley toward Morgan Pass, but some up Pine Creek.  Important during World War II and still some active tungsten extraction into the 2000's, but now closed.  View down from Pine Creek Pass trail.  (See "Mine in the Sky", by Joseph M. Kurtak.)
BakerClaw
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>