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Unnamed

Occurrence in Alaska, United States with commodities Lead, Zinc
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Geologic information

Identification information

Deposit ID 10003131
MRDS ID A015663
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -171.12319, 63.43913 (WGS84)
Relative position This site is on an unnamed stream that flows southeast to its mouth at Poowooliak Bay on the southwest coast of St. Lawrence Island, 7 miles northeast of Poowooliak Point. The site is about 2 miles upstream of the mouth and is located within 1/2 mile. It is locality 13 of Cobb (1972) and Cobb (1980) summarized relevant references under the name 'Unnamed occurrence'.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) The volcanic rocks here are altered but the nature of the alteration, except for the presence of quartz veins, is not described.

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -171.12319, 63.43913
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Comments on the geologic information

  • Geologic Description = Galena and sphalerite are present in quartz veins cutting altered andesitic volcanic rocks (Patton and Csejtey, 1971, p. C15). One grab sample contained 150 ppm copper, 2,000 ppm lead, 3,000 ppm zinc, and 10 ppm silver (Patton and Csejtey, 1971, p. C8). Some of the nine stream sediment samples from this drainage contain anomalous metal concentrations, 2 samples have 100 and 200 ppm lead, one has 0.5 ppm silver, one has 15 ppm molybdenum, and nine contain 700 to 1,500 ppm barium (Patton and Csejtey, 1972).
  • Age = The andesitic volcanic rocks are mapped as part of a mid-Cretaceous assemblage of diverse lithologies and compositions, but the mineralization here could be 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 = One grab sample contained 150 ppm copper, 2,000 ppm lead, 3,000 ppm zinc, and 10 ppm silver (Patton and Csejtey, 1971, p. C8). Some of the nine stream sediment samples from this drainage contain anomalous metal concentrations, 2 samples have 100 and 200 ppm lead, one has 0.5 ppm silver, one has 15 ppm molybdenum, and nine contain 700 to 1,500 ppm barium (Patton and Csejtey, 1972).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015663
Unknown MF MF 0465-13
USGS Alaska Resource Data File ARDF SL016

Bibliographic references

  • 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., 1972, Analyses of stream sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.

  • 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

Reporter information

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