Unnamed (near Hamilton Creek)

The Unnamed (near Hamilton Creek) is a uranium 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 (near Hamilton Creek)

Commodity

Primary: Uranium

Location

State: Alaska
District: Kupreanof

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: Phosphate, warm current type
Model Name: Phosphate, upwelling type

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Carbonate-Fluorapatite

Comments

Comment (Production): Production Notes = None

Comment (Exploration): Status = Probably inactive

Comment (Reference): Primary Reference = Dickinson, 1979 (OF 79-1316)

Comment (Geology): Age = Permian based on age of host rock.

Comment (Geology): Geologic Description = A sedimentary uranium deposit associated with chemically precipitated, marine phosphorite that contains carbonate fluorapatite as the uranium- bearing mineral (Dickinson, 1979). Fragments of laminated phosphate rock occur in white calcite veins in a fine grained, light to dark gray, laminated, apatite-bearing silty dolomite. Radioactivity reaches 20 times background in a 0.5 m thick bed. One sample of more highly radioactive rock indicated beta eU of 80, plus-or-minus 24 ppm uranium. Unit poorly exposed. Dickinson (1979) tentatively assigned the dolomite to the Permian Cannery Formation. More recent work by Brew and others (1984) indicates that the Cannery Formation is of Mississippian and Devonian age and by Karl (personal communication, 1998) indicates that the Cannery is probably Mississippian and Permian in age. Brew and others (1984), however, recently assign the rocks in the vicinity of the occurrence to the Permian Pybus Formation, a sequence of limestone, dolomite, and chert that outcrops widely on Kuiu and Kupreanof Islands.

Comment (Workings): Workings / Exploration = None apparently; occurrence exposed in a quarry for road metal.

Comment (Deposit): Model Name = Sedimentary phosphate (Cox and Singer, 1984; model 34c or 34d)

Comment (Reserve-Resource): Reserves = None

Comment (Deposit): Other Comments = Likely that the Pybus Formation elsewhere in the vicinity has beds or lenses of marine phosphorite.

References

Reference (Deposit): Dickinson, K.A., 1979, Uraniferous phosphate occurrence on Kupreanof Island, southeast Alaska: U.S. Geological Survey Open-File Report 79-1316, 2 p.

Reference (Deposit): Brew, D. A., Ovenshine, A. T., Karl, S. M., and Hunt, S. J., 1984, Preliminary reconnaissance geologic map of the Petersburg and parts of the Port Alexander and Sumdum 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 84-405, 43 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

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