Unnamed (near Point St. Albans)

Occurrence in Alaska, United States with commodities Silver, Lead, Zinc, Antimony

Geologic information

Identification information

Deposit ID 10000281
MRDS ID A010325
Record type Site
Current site name Unnamed (near Point St. Albans)
Related records 10233877

Geographic coordinates

Geographic coordinates: -133.95882, 56.10972 (WGS84)
Relative position Location known to within 100 meters. Veins are exposed on a bedrock bench exposed in the intertidal zone near Point St. Albans. Site is about 350 yards southwest of triangulation station 'June' show on the current (1968) 1:63,360 topographic map. Locality 49 of Grybeck, Berg, and Karl (1984).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Primary
Antimony Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Pyrite Ore
Sphalerite Ore
Berthierite Ore
Quartz Gangue

Alteration

  • (Local) None or minor.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -133.95882, 56.10972

Comments on the geologic information

  • Geologic Description = Several quartz-calcite veins and lenses up to 6 feet thick and up to a hundred feet long, exposed in rocks exposed in the intertidal zone, contain abundant sphalerite, galena, pyrite, arsenopyrite, and berthierite (FeSb2S4) (Grybeck, Berg, and Karl, 1984). The veins cut the periphery of a Cretaceous hornblende diorite pluton, which intrudes turbidite of the Silurian Bay of Pillars Formation (Brew, and others, 1984). Selected samples of the veins contain up to 0.5 ppm Au, 300 ppm Ag, 360 ppm Cu, and about 2% Pb and 14% Zn.
  • Age = Veins cut Cretaceous hornblende diorite.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

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 = First noted by Houston and others (1958, p. 24) in their work on the uranium resources of Alaska; they provide little information about the veins other than they contain less than 0.0001 equivalent uranium and sphalerite. A claim had been staked on the deposits in 1954 but apparently it has not been active since (U.S. Bureau of Mines, 1980) the description of this site is largely based on field work in the early 1980's during a mineral resource assessment of the Petersburg quadrangle (Grybeck, Karl, and Berg, 1984).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010325
USGS Alaska Resource Data File ARDF PE045

Bibliographic references

  • Deposit

    Houston, J.R., Bates, R.G., Velikanje, R.S., and Wedow, Helmuth, Jr., 1958, Reconnaissance for radioactive deposits in southeastern Alaska, 1952: U.S. Geological Survey Bulletin 1058-A, p. 1-31.

  • Deposit

    Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Petersburg quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-870, 53 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Petersburg quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-415, 1 sheet, scale 1:250,000.

  • 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 = Grybeck, Berg, and Karl, 1984

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)

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