Skin Diver Mine
From Mojave Underground USA Wiki
The Skin Diver mine is located in Dry Canyon, just north of Ophir, UT. The mine's modern name was derived from its tight squeeze to enter through the gate. Its actual name is unknown.
The mine is fairly deep and offers a good 1/2 - 1 hour worth of exploring. It's safety concerns are minimal. There is a steep shafts that has anchor points for dropping in with rope.
Please view our Mine Safety article before exploring abandoned mines.