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  3. Alaska Resource Data File (ARDF)

Unnamed (inner Tamgas Harbor)

Occurrence, Undetermined

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale KC
Quadrangle map, 1:63,360-scale A-5
Latitude 55.079
Longitude -131.542
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the south tip of an islet just off the east shoreline of inner Tamgas Harbor, about 0.85 mile north-northeast of Crab Point. The site is in section 27, T. 78 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 42 in Berg (1972 [I 684]), loc. 150 in Elliott and others (1978), and loc. 46 in Karl (1992). The location is accurate within a few hundred feet.

Geologic setting

Geologic description

The country rocks at this site are greenschist-grade schist and hornfels, probably derived from volcanic, sedimentary, and intrusive rocks of Silurian and Ordovician age (Berg, 1972; Berg and others, 1988). The occurrence consists of pyrite and chalcopyrite very sparsely disseminated in the schist and hornfels (Berg, 1992, loc. 42).
Geologic map unit (-131.54367725242, 55.0786587700894)
Mineral deposit model Disseminated sulfide deposit of undetermined origin.

Production and reserves

Indication of production None

References

MRDS Number A012392

References

Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360.
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000.
Elliott, R.L., Berg, H.C., and Karl, S.M.,1978, Map and table describing metalliferous and selected non-metalliferous mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73B, 17 p., 1 sheet, scale 1:250,000.
Reporters H.C. Berg, USGS
Last report date 7/7/1999