Unnamed (on Portage Creek)

The Unnamed (on Portage Creek) is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (on Portage Creek)

Commodity

Primary: Gold

Location

State: Alaska
District: Yentna

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Gold

Comments

Comment (Reference): Primary Reference = Curtin, Karlson, O'Leary, Day, and McDanal, 1978

Comment (Workings): Workings / Exploration = Reconnaissance mapping, stream silt and pan concentrate sampling by the U.S. Geological Survey (Reed and Elliott, 1970; Curtin, Karlson, O'Leary, Day, and McDanal, 1978; Reed and Nelson, 1980). Reconnaissance exploration has been conducted in the area by various private companies at various times during the 1970s and 1980s. Results from the exploration campaigns are not published.

Comment (Geology): Geologic Description = Curtin, Karlson, O'Leary, Day, and McDanal (1978) report pan concentrate samples with visible gold from Quaternary gravels at this locality. The gold may have been derived from sources similar to those noted upstream from this locality. About one mile upstream at site TL007, chalcopyrite, pyrrhotite, arsenopyrite, molybdenite and pyrite with elevated gold values occur as joint coatings, in veins, and as disseminations adjacent to northwest-striking mineralized joint sets. In addition, altered granodiorite float located about 2 miles S72W contains gold-bearing veinlets of arsenopyrite and pyrite (TL063).

Comment (Deposit): Model Name = Placer Au-PGE (Cox and Singer, 1986; model 39a).

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Pleistocene.

References

Reference (Deposit): Curtin, G.C., Karlson, R.C., O'Leary, R.M., Day, G.W., and McDanal, S.K., 1978, Geochemical and generalized geologic map showing the distribution of gold and silver, Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-E, 2 sheets, scale 1:250,000.

Reference (Deposit): Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.

Reference (Deposit): Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

Reference (Deposit): Reed, B.L., and Elliot, R.L., 1970, Reconnaissance geologic map, analyses of bedrock and stream sediment samples, and an aeromagnetic map of parts of the southern Alaska Range: U.S. Geological Survey Open-file Report 70-271, 24 p., 4 plates, scale 1:250,000.

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