Unnamed (south of Zachary Bay)

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

Geologic information

Identification information

Deposit ID 10308127
Record type Site
Current site name Unnamed (south of Zachary Bay)

Geographic coordinates

Geographic coordinates: -160.66442, 55.27223 (WGS84)
Relative position This occurrence is located approximately 3.5 miles southeast of the head of Zachary Bay on Unga Island (Wilson and others, 1988, locality 26). The map site is at an elevation of 900 feet, in the SW1/4 of sec. 11, T. 57 S., R. 75 W., of the Seward Meridian. The location is accurate to within 1,200 feet.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Lead Primary
Zinc Primary
Copper Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore


  • (Local) The mineralization is accompanied by strong silicification.

Nearby scientific data

(1) -160.66442, 55.27223

Comments on the geologic information

  • Geologic Description = At this site, Resource Associates of Alaska in 1981 located a 50-foot-wide zone of brecciated, silicified, pyritic andesite that may be a breccia pipe (Trujillo and others, 1981). The breccia fragments are in-filled by chalcopyrite, sphalerite, and galena over a 35-foot width of the zone. One sample of mineralized rock assayed 1.09 ounces of silver per ton, 2.07 percent zinc, and 0.58 percent lead. The country rocks are mapped as late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995).
  • Age = Eocene or younger.

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 = One mineralized rock sample collected by Resource Associates of Alaska assayed 1.09 ounces of silver per ton, 2.07 percent zinc, and 0.58 percent lead.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM054

Bibliographic references

  • Deposit

    Trujillo, R.S., Anderson, G., MacLeod, T., Hendrick, K., Farnham, S., Peterson, J., 1981. Exploration and evaluation of the Unga-Popof-Korovan Islands portion of lands leased from Aleut Native Corporation: Resource Associates of Alaska report, 70 p., 38 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Peterson, R.J., Handverger, P., Rosenkrans, D., Bartels, E, and Woolston, D., 1983, Shumagin Islands precious metal exploration program southwest Alaska: UNC Teton Exploration Drilling Company report, 61 p. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • 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., 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.

Comments on the references

  • Primary Reference = Trujillo and others 1981

General comments

Subject category Comment text
Deposit Other Comments = This occurrence is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-JAN-01 S.H. Pilcher U.S. Geological Survey