Unnamed (in Contact Gulch)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.4943
Longitude -142.3129
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is in Contact Gulch about a half mile upstream of its mouth on the Chitistone River. It is at an elevation of about 3,000 feet in the NW1/4 of section 27, T. 4 S., R. 17 E. of the Copper River Meridian. This is locality 82 of MacKevett (1976); the location is accurate to within a few hundred feet. Cobb and MacKevett (1980) included this prospect under the name 'Contact Gulch'.

Geologic setting

Geologic description

At this prospect, surface pits and cuts explored scattered bornite-bearing veinlets and malachite-coated fractures in Triassic Nikolai Greenstone (MacKevett and Smith, 1972; MacKevett, 1976). 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 (-142.314966316416, 61.4938841767401)
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).
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration Surface pits and 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 A011715

References

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