1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Unnamed (southeast of Soda Lake)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals native copper

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale C-4
Latitude 62.534
Longitude -142.8867
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the north-facing slopes, southeast of Soda Lake. It is at an elevation of about 4,500 feet, about 1,800 feet south-southeast of the east end of Soda Lake and 2,000 feet north of hill 5410. The site is just north of the center of section 25, T. 9 N., R. 13 E. of the Copper River Meridian. This is locality 10 of Richter and others (1975) and National Park Service locality WRST-11 (unpublished data). Cobb and Richter (1980) included this locality as an 'Unnamed occurrence'. It is located to within a few hundred feet.

Geologic setting

Geologic description

Native copper occupies fractures in amygdaloidal basalt of the Triassic, Nikolai Greenstone (Richter and others, 1975, 1976; Richter, 1976). Copper mineralization is locally 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 (-142.888845982411, 62.5336318798464)
Mineral deposit model Basaltic copper (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization Cretaceous? Copper mineralization is locally 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

Indication of production None

Additional comments

The occurrence is in the Wrangell-St. Elias National Preserve.

References

MRDS Number A011441

References

Cobb, E.H., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p.
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.
Richter, D.H., 1976, Geologic map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-932, 1 sheet, scale 1:250,000.
Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, 1 sheet, scale 1:250,000.
Reporters Travis L. Hudson (Applied Geology)
Last report date 11/24/2002