Hidden Treasure

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; native copper
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale D-8
Latitude 61.8025
Longitude -143.886
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the ridge east of upper Fall Creek. It is at an elevation of about 5,600 feet, 1,000 feet northeast of peak 6050. The site is in the NW1/4 of section 12, T. 1 S., R. 8 E. of the Copper River Meridian. This is locality 182 of MacKevett (1976); the location is accurate to within 1,000 feet. Cobb and MacKevett (1980) included this prospect under the name 'Fall Cr.'.

Geologic setting

Geologic description

The deposit at this prospect consists of bornite and chalcocite in thin veins, and native copper and chalcocite that fill amygdules in Triassic Nikolai Greenstone (Moffit and Mertie, 1923, p. 114; MacKevett, 1976). Quartz accompanies some copper mineralization. A short adit and surface open cuts explored this prospect. Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Geologic map unit (-143.888097954974, 61.8020438966955)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).

Production and reserves

Workings or exploration A short adit and surface open cuts explored this prospect.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

MRDS Number A011766

References

Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003