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Powooiliak Point

Occurrence in Alaska, United States with commodity Lead
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Geologic information

Identification information

Deposit ID 10003130
MRDS ID A015662
Record type Site
Current site name Powooiliak Point
Related records 10185629

Geographic coordinates

Geographic coordinates: -171.29929, 63.36412 (WGS84)
Relative position Poowooliak Point is on the southwest coast of St. Lawrence Island, 3 miles east of the mouth of the Okok River. The site is on a wave cut bench at the base of the sea cliff on the north side of Poowooliak Point. It is located within 1/4 mile and is locality 12 of Cobb (1972). Cobb (1980) summarized relevant references under the name 'Poowooliak Point'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary

Materials information

Materials Type of material
Galena Ore
Calcite Gangue
Pyrite Gangue
Pyrrhotite Gangue

Alteration

  • (Local) The lithic tuff is kaolinized and cut by sulfide-bearing quartz veins.

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 Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -171.29929, 63.36412
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Comments on the geologic information

  • Geologic Description = Pyrite and galena are present in irregular quartz veins cutting kaolinized limonite-stained lithic tuffs. The mineralization is exposed on a wave cut bench below sea cliffs, northwest of Poowooiliak Point. This is close to the mapped contact between a Triassic to Permian age mafic assemblage and Cretaceous volcanic rocks (Patton and Csejtey, 1980). The mineralization described by Patton and Csejtey (1971) is apparently in Cretaceous volcanic rocks.??Berg and Cobb (1967, p. 9) report the presence of a 1/2 to 2 inch calcite vein containing pyrite, chalcopyrite, galena, pyrrhotite, and sphalerite in a small limestone outcrop at Cape Puguviliak (a former name for Poovooiliak Point, Cobb, 1980, p. 58). The source of this description is not identified. The mineralization described by Berg and Cobb (1967) may be in the nearby Triassic to Permian age mafic Permo-Triassic assemblage and a different occurrence than that described and sampled by Patton and Csejtey (1971).
  • Age = Cretaceous or Tertiary, the age of volcanic and related hypabyssal intrusive rocks on western St. Lawrence Island (Patton and Csejtey, 1980).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bering Sea

Comments on the workings information

  • Workings / Exploration = None

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015662
Unknown MF MF 0465-12
USGS Alaska Resource Data File ARDF SL014

Bibliographic references

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Patton, W.W., Jr., and Csejtey, Bela, Jr., 1971, Preliminary geologic investigations of western St. Lawrence Island, Alaska: U.S. Geological Survey Professional Paper 684-C, p. C1-C15.

  • Deposit

    Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Patton and Csejtey, 1971 (PP 684-C)

General comments

Subject category Comment text
Deposit Model Name = Polymetallic sulfide mineralization in altered volcanic rocks. Deposit model 22c (?); polymetallic veins
Deposit Other Comments = Berg and Cobb (1967, p. 9) report the presence of a 1/2 to 2 inch calcite vein containing pyrite, chalcopyrite, galena, pyrrhotite, and sphalerite in a small limestone outcrop at Cape Puguviliak (a former name for Poovooiliak Point, Cobb, 1980, p. 58). The source of this description is not identified. The mineralization described by Berg and Cobb (1967) may be in the nearby Triassic to Permian age mafic Permo-Triassic assemblage and a different occurrence than that described and sampled by Patton and Csejtey (1971).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-SEP-1998 Travis L. Hudson Applied Geology