South Pass greenstone belt

One large 34-ounce nugget resides in the Los Angeles Museum of Natural History that was recovered from Rock Creek along the western flank of the greenstone belt.

Mapping by Hausel[1] identified numerous shear structures along with steeply plunging ore shoots associated with isoclinal and open folding that may be favorable for saddle reef-type gold mineralization.

The Cathedral Bluffs Tongue of the Eocene Wasatch Formation, is estimated to host more than 28.5 million ounces of placer gold in the Dickie Springs-Oregon Gulch area.

The axis of the belt is paralleled by foliation, shear zones, and lower order fold axes, and has been intruded along its flanks by granite and granodiorite.

The diverse lithology of the Miners Delight Formation, ranging in thickness from 5000 to 20,000 feet,[6] is dominated by gray to dark brown feldspathic and biotitic metagreywacke, and mica schist.

The Miners Delight formation which hosts several epigenetic shear zone and vein gold deposits is subdivided into several lithologic units, the relative ages of which are not known.

The unit is exposed on both limbs of the South Pass synclinorium, and in most places conformably, but locally unconformably, overlies the Goldman Meadows Formation.

A broad zone of carbonated breccias and intensely folded schists, representing a major break in the geologic record, is found at the top of the formation.

The iron formation consists of laminated dark gray to black, fine-grained, hard, dense alternating 0.1-to-2-inch-thick (2.5 to 50.8 mm) layers of magnetite and metachert and varying amounts of amphibole.