The Unnamed (east side of Queen 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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Unnamed (east side of Queen Inlet) MRDS details
Site Name
Primary: Unnamed (east side of Queen Inlet)
Commodity
Primary: Iron
Secondary: Tin
Secondary: Molybdenum
Secondary: Copper
Secondary: Cobalt
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
Alteration Type: L
Alteration Text: Calc-rocks have been altered to tactite composed mainly of calcite, garnet, hornblende, pyroxene and quartz. Propylitic alteration of alaskite has introduced actinolite, calcite, chlorite, and epidote. Actinolite and chlorite, with plagioclase, have also formed in the alteration of the andesite dikes.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Magnetite
Ore: Pyrite
Gangue: Calcite
Gangue: Garnet
Gangue: Quartz
Comments
Comment (Geology): Age = Tertiary.
Comment (Deposit): Other Comments = Lenses are too small for development, but mineralization is widespread and better deposits could exist in the same system. The mineralized area is in Glacier Bay National Park and Preserve.
Comment (Reference): Primary Reference = MacKevett and others, 1971
Comment (Workings): Workings / Exploration = Poorly exposed bodies of magnetite and disseminated and blebby pyrite occur in tactite, marble and alaskite. An 18-foot chip sample of the richest-appearing magnetite body contained 23.4 percent iron as ferric oxide. Seven other samples showed major (greater than 10 percent) iron. Copper, cobalt, molybdenum, tin, and zinc were detected in anomalous amounts, respectively 300 ppm, 300 ppm, 20 ppm, 30 ppm, and 300 ppm. There are no mine workings. The most detailed investigation was conducted by the Geological Survey in 1966 (MacKevett and others, 1971).
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Contact and porphyry mineralization, magnetite (Fe) skarn (Cox and Singer, 1986; model 18d).
Comment (Geology): Geologic Description = The area is underlain by a mixed beded unit of Devonian and Silurian age that is mostly volcanic. Minor amounts of slate, argillite, and marble occur with andesitic volcanics. A major fault that strikes northwest separates the Devonian-Silurian unit from hornfels and marble of undivided Paleozoic age--this fault may mark the uphill termination of the mineral occurrence (Brew and others, 1978, pl. 1A). The bedded rocks are cut by alaskite and porphyritic dikes, probably of Tertiary age. Detailed mapping shows very complex relations (MacKevett and others, 1971, pl. 10). Magnetite occurs in tactite and marble interleaved with alaskite; the marble units generally strike east-northeast and are cut by dark porphyritic andesite dikes that strike northwest. The magnetite-rich bodies are as much as 20 feet thick. The alaskite contains numerous irregular quartz veins and irregular clots, masses and disseminations of sulfides, mainly pyrite and minor chalcopyrite. The andesite dikes also contain disseminated and blebby pyrite. Except for one sample, which contained 7 percent iron, all samples (eight total) contained greater than 10 percent iron. An 18-foot chip sample of the richest magnetite zone contained 23.4 percent iron reported as ferric oxide. The samples were anomalous in copper, cobalt, and tin.? the magnetite bodies are marked by anomalies of about 1000 gammas. Exposure is poor; magnetic anomalies on an uphill traverse were as much as 1300 gammas, probably indicating buried magnetite lenses.
References
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): 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.
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