Unnamed (west of Rendu Inlet)

The Unnamed (west of Rendu Inlet) is a iron 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 (west of Rendu Inlet)

Commodity

Primary: Iron

Location

State: Alaska
District: Juneau

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: Skarn Fe

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Magnetite
Ore: Pyrite
Gangue: Calcite
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = Deposits appear to be small, but the mixed marble-quartz diorite area is favorable for other deposits. ? the area is in Glacier Bay National Park and Preserve.

Comment (Reference): Primary Reference = MacKevett and others, 1971

Comment (Deposit): Model Name = Pyrite-magnetite (Fe) skarn (Cox and Singer, 1986; model 18d).

Comment (Workings): Workings / Exploration = There are no workings. MacKevett and others (1971) collected samples and ran magnetic traverses in the occurrence area. Magnetic anomalies of as much as 5500 gammas are attributed to concealed masses of magnetite skarn.

Comment (Geology): Geologic Description = Poddy magnetite-rich skarn deposits occur in limestone-marble units of Devonian-Silurian age at or near medium-coarse-grained intrusions of hornblende quartz diorite of Cretaceous age (Rossman, 1963 B 1121-K; Brew and others, 1978). Calc-silicate rich phases of the skarn consist of tactite composed of grossularite-rich garnet and epidote accompanied by quartz, chlorite, and calcite. Magnetite and pyrite locally form poddy masses. The area is poorly exposed and other deposits--inferred from magnetic anomalies--could be buried by overburden. Based on three samples reported by MacKevett and others, 1971 (locality 39, table 9) the iron content of the skarn ranges from about 5 percent to more than 10 percent. No precious metals were detected and copper and other valuable metals are present at near background levels. Titanium values are low, so magnetite is inferred to be an essentially pure phase.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Cretaceous.

References

Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

Reference (Deposit): Rossman, Darwin, 1963, Geology of the eastern part of the Mount Fairweather quadrangle, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1121-K, p. K1-K57.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

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