Utah Queen
From Mojave Underground USA Wiki
The Crystal Mine is located within the ghost town of Jacob City. It's modern name is derived from the high abundance of large calcite crystal formations toward the end of a side passage deep within the mine. It's original name is not known. The mine is gated, but one can squeeze through the bars in the gate. The mine is deep and provides a few hours of good exploring. There are still a few artifacts within.
Please view our Mine Safety article before exploring abandoned mines.