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  3. Mineral Resource Data System (MRDS)

Unnamed (near Hamilton Creek)

Occurrence in Alaska, United States with commodity Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10000273
MRDS ID A010317
Record type Site
Current site name Unnamed (near Hamilton Creek)

Geographic coordinates

Geographic coordinates: -133.66385, 56.86584 (WGS84)
Relative position As first identified by Dickinson (1979), three samples were collected 'from a road-metal pit located near the center of the southern half of section 6, T. 58 S., R. 75 E, in the Petersburg D-5 quadrangle'. This is just south of Hamilton Creek. The quarry is shown on the current (1993 series) U. S. Forest Service, 1:63,360-scale road map for the quadrangle.

Site location context

Political divisions (FIPS codes)

Wade Hampton(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg D-5(quadrangle 1:63,360 scale)

Port Alexander NE(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Uranium Primary

Materials information

Materials Type of material
Carbonate-Fluorapatite Ore

Mineral occurrence model information

Model code 243
USGS model code 34c
Deposit model name Phosphate, upwelling type
Model code 244
USGS model code 34d
Deposit model name Phosphate, warm current type

Nearby scientific data

(1) -133.66385, 56.86584
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Economic information

Comments on the geologic information

  • 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.
  • Age = Permian based on age of host rock.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Kupreanof

Comments on the production information

  • Production Notes = None

Comments on the reserve resource information

  • Reserves = None

Comments on the workings information

  • Workings / Exploration = None apparently; occurrence exposed in a quarry for road metal.

Reference information

Bibliographic references

  • Deposit

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

  • 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.

  • 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.

Comments on the references

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

General comments

Subject category Comment text
Deposit Model Name = Sedimentary phosphate (Cox and Singer, 1984; model 34c or 34d)
Deposit Other Comments = Likely that the Pybus Formation elsewhere in the vicinity has beds or lenses of marine phosphorite.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1998 H.C. Berg U.S. Geological Survey
Reporter 01-NOV-1998 D.J. Grybeck U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.