Prospect in Alaska, United States with commodities Silver, Gold

Geologic information

Identification information

Deposit ID 10308145
Record type Site
Current site name Herron
Alternate or previous names E.C.

Geographic coordinates

Geographic coordinates: -160.50841, 55.19724 (WGS84)
Relative position This prospect is on a trail at an elevation of about 600 feet, on the east side of Unga Island approximately 1 mile north of the abandoned village of Unga (Wilson and others, 1988, locality 47). The location is accurate to within 1,000 feet.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Gold Primary

Materials information

Materials Type of material
Pyrite Ore
Jasper Gangue
Quartz Gangue


  • (Local) Alteration includes propylitization and silicification.

Nearby scientific data

(1) -160.50841, 55.19724

Comments on the geologic information

  • Geologic Description = Trujillo and others (1981) describe this prospect as a 60-foot-wide zone of propylitic and pyritic alteration marked by limonitic and chalcedonic quartz and jasper float. Hand-trenching revealed quartz veins as much as 2 feet in width associated with intense alteration. The best assays obtained were 0.02 ppm gold, 1.5 ppm silver, and 0.78 ppm mercury. An old 20-foot shaft near the veins was sunk into intensely silicified tuffs. The wall rocks are part of the 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 Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = The prospect was covered by two unpatented mining claims. Old workings are a 20-foot shaft at the northwest end of claims and scattered pits elsewhere. In 1981 Resource Associated of Alaska hand trenched and sampled the prospect. Their best values were 0.02 ppm gold, 1.5 ppm silver, and 0.78 ppm mercury. Battle Mountain Exploration Company examined and sampled the prospect in 1986, but their samples contained no metal values of note.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM075

Bibliographic references

  • Deposit

    Webber, B.S., Moss, J.M., Rutledge, F.A., and Sanford, R.S., 1946, Reconnaissance examinations of parts of the Alaska Peninsula and Aleutian Islands southwestern Alaska: U.S. Bureau of Mines, unpublished report of investigations, 40 p. (Unpublished report held by the U.S. Geological Survey, Anchorage.)

  • 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

    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 Model Name = Epithermal gold vein
Deposit Other Comments = the prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-JAN-01 S.H. Pilcher U.S. Geological Survey