Unnamed (north bank of Chitina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals malachite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-2
Latitude 61.0459
Longitude -141.7115
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 2,000 feet on the north bank of the Chitina River, about 3 miles downstream of the terminus of Chitina Glacier. The occurrence is about 2,000 feet east of the center of section 32, T. 9 S., R. 21 E. of the Copper River Meridian. This is locality 16 of MacKevett (1976); the location is it is accurate to within about 1,000 feet.

Geologic setting

Geologic description

This occurrence consists of malachite along fractures and unspecified copper-bearing minerals in quartz-epidote veins that cut Triassic Nikolai Greenstone (MacKevett, 1976, 1978). 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 (-141.713494153657, 61.0454805478781)
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 Quartz-epidote veining and replacement(?).

Production and reserves

Workings or exploration Limited surface examination.
Indication of production None

Additional comments

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

References

References

MacKevett, E.M., Jr., Cox, D.P., Potter, R.W., III, and Silberman, M.L., 1997, Kennecott-type deposits in the Wrangell Mountains, Alaska--High-grade copper ores near a basalt-limestone contact, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 66-89.
Reporters Travis L. Hudson (Applied Geology, Inc.)
Last report date 1/12/2003