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Clark Bay

Occurrence in Alaska, United States with commodities Copper, Silver, Gold, Molybdenum, Zinc
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Geologic information

Identification information

Deposit ID 10308208
Record type Site
Current site name Clark Bay

Geographic coordinates

Geographic coordinates: -159.90244, 55.82925 (WGS84)
Relative position This occurrence is located on the Alaska Peninsula, on Red Hill between Clark Bay and Grub Gulch (Christie, 1974, color anomaly 82; MacKevett and Holloway, 1977, locality 2; Wilson and others, 1988, locality 2). The map site is on the east shore of Clark Bay, due west of the center of sec. 5, T. 51 S., R. 69 W., of the Seward Meridian. The location is accurate to within 1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary
Molybdenum Secondary
Zinc Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4
Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2
Model code 78
USGS model code 20c
Deposit model name Porphyry Cu-Au
Mark3 model number 34

Nearby scientific data

(1) -159.90244, 55.82925
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Comments on the geologic information

  • Geologic Description = This occurrence is marked by a color anomaly measuring approximately 8,000 by 4,300 feet (Christie 1974). The area contains Miocene basalt and andesite and Oligocene to Eocene sandstones and siltstones of the Stepovak Bay Formation ( Wilson and others, 1995). Biotite from the volcanic rocks has been dated at 10 to 6 million years (Wilson and others, 1994). Christie (1974) describes fine-grained porphyritic diorite at this location. The rock carries traces of chalcopyrite and as much as 1 percent pyrite. The volcanic rocks carry 1 to 12 percent pyrite. Soil and rock chip samples contained as much as 235 ppm copper, 0.46 ppm gold, 15 ppm molybdenum, 5.8 ppm silver, and 455 ppm zinc. Arbogast and others (1987) describes an intermediate intrusive rock containing abundant pyrite. Silt samples collected at this locality contained 100 ppm copper, 10 ppm molybdenum, and 1 ppm silver; pan concentrates contained 10 ppm molybdenun and 100 ppm tungsten (Frisken, 1992).
  • Age = Tertiary.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = This site was sampled by the Aleut-Quintana-Duval joint venture in 1974 (Christie, 1974). Additional sampling was carried out by the U.S. Geological Survey in the mid-1980's (Arbogast and others, 1987; Frisken, 1992).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF SB002

Bibliographic references

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Arbogast, B.F., Bailey, E.A., and Frisken, J.G., 1987, Analytical results and sample locality maps of stream sediment, heavy-mineral-concentrate, and rock samples from the Port Moller, Stepovak Bay, and Simeonof island quadrangles, Alaska: U.S. Geological Survey Open-File Report 87-502, 122 p., 2 sheets, scale 1:250,000.

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Frisken, J.G., 1992, Interpretation of reconnaissance geochemical data from the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Bulletin 1968, 47 p., 3 map sheets, scale 1:250,000.

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Wilson, F.H., Shew, N., DuBois, G.D., and Bie, S.W., 1994, Sample locality map and analytical data for potassium-argon ages in the Port Moller, Stepovak Bay and Simeonof Island quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2155-E, 18 p., 1 map sheet, scale 1:250,000.

  • Deposit

    Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Christie, 1974

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu, Porphyry Cu-Mo, Porphyry Cu-Au (Cox and Singer, 1986; models 17, 21a, 20c)
Deposit Model Number = 17, 21a, 20c
Deposit Other Comments = This site is on land selected by the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 18-OCT-00 S.H. Pilcher U.S. Geological Survey