Unnamed (on the Yentna Glacier)

The Unnamed (on the Yentna Glacier) is a molybdenum and copper 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 the Yentna Glacier)

Commodity

Primary: Molybdenum
Primary: Copper

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: Porphyry Cu-Mo
Model Name: Porphyry Mo, low-F

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Molybdenite
Ore: Chalcopyrite

Comments

Comment (Geology): Age = Middle Tertiary; mineralization is interpreted to be related to the 38 m.y. Foraker pluton (Reed and Nelson, 1980).

Comment (Reference): Primary Reference = Reed and others, 1978

Comment (Geology): Geologic Description = Granodiorite cobbles with fractures containing molybdenite, pyrite and minor chalcopyrite found at this site on the Yentna Glacier moraine are probably derived from the middle Tertiary (38 m.y.) Foraker pluton (Reed and others, 1978; Reed and Nelson, 1980). Minor malachite staining in Paleozoic sedimentary rocks is noted near the pluton contact. Further information that supports the Foraker pluton as the source of the float is anomalous copper (300 to 700 ppm) in a stream sediment and glacial debris sample taken from a site on the Yentna Glacier which drains the Foraker pluton (Curtin, Karlson, O'Leary, Day, and McDougal,1978). Use of a porphyry for this occurrence is not to suggest that a cobble with mineralized fractures is in itself a porphyry deposit. Instead, its possible affiliation with the Mt. Foraker pluton suggests that these veins could be a distal feature related to a concealed porphyry system. Not enough data exists to quantify this determination (Reed and others, 1978). This site is located approximately two and a half miles north-northeast of TL057 on the Yentna Glacier moraine.

Comment (Deposit): Model Name = Possibly related to Porphyry Cu-Mo (Cox and Singer, 1986; model 21a) or Porphyry Mo, Low-F (Cox and Singer, 1986; model 21b).

Comment (Deposit): Other Comments = This site is within Denali National Park and Preserve.

Comment (Workings): Workings / Exploration = Reconnaissance mapping and rock sampling are all that have been done here (Reed and Nelson, 1980). Minor malachite staining in Paleozoic sedimentary rocks is noted near the pluton contact. Further information that supports the Foraker pluton as the source of the float is anomalous copper (300 to 700 ppm) in a stream sediment and glacial debris sample taken from a site on the Yentna Glacier which drains the Foraker pluton (Curtin, Karlson, O'Leary, Day, and McDougal,1978).

Comment (Exploration): Status = Inactive

References

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

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

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