Unnamed (ridge NE of Round Mountain)

The Unnamed (ridge NE of Round Mountain) is a 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 (ridge NE of Round Mountain)

Commodity

Primary: Copper

Location

State: Alaska
District: Ketchikan

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Local bleaching and iron and copper staining.

Rocks

Name: Conglomerate
Role: Host
Age Type: Host Rock
Age Young: Late Permian

Analytical Data

Not available

Materials

Ore: Malachite
Ore: Pyrite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Polymetallic veins? (Cox and Singer, 1986; model 22c)

Comment (Geology): Geologic Description = The hostrocks of these occurrences are bounded by faults, and consist of recrystallized, Upper Triassic sedimentary and volcanic rocks that unconformably overlie a sequence of undivided, metamorphosed Silurian and Ordovician volcanic, sedimentary, and intrusive rocks (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the occurrences are in bleached, Upper Triassic, rhyolite tuff-breccia, black shale and limestone, and conglomerate. They consist of quartz-calcite-pyrite fissure veins in shear zones; of minute cubes of pyrite disseminated in the country rocks; and of local copper-staining (malachite) (Berg, 1972; Karl, 1992). A sample of felsic tuff-breccia contained 150 ppm Pb; a sample of a quartz-calcite-pyrite fissure vein contained 300 ppm Cu; and a sample of sheared rhyolite breccia contained 700 ppm Pb (Karl, 1992, loc. 11a-d).

Comment (Reference): Primary Reference = Karl, 1992

Comment (Workings): Workings / Exploration = A sample of felsic tuff-breccia contained 150 ppm Pb; a sample of a quartz-calcite-pyrite fissure vein contained 300 ppm Cu; and a sample of sheared rhyolite breccia contained 700 ppm Pb (Karl, 1992, loc. 11a-d).

Comment (Geology): Age = The fissure veins probably are Late Cretaceous or younger in age.

References

Reference (Deposit): Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

Reference (Deposit): Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Reference (Deposit): 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,

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