Vent

Occurrence in Alaska, United States with commodities Gold, Arsenic, Mercury

Geologic information

Identification information

Deposit ID 10308159
Record type Site
Current site name Vent

Geographic coordinates

Geographic coordinates: -160.45242, 55.30924 (WGS84)
Relative position This occurrence is located on Popof Island approximately 1 mile north of Red Cove and 0.75 mile west of the lagoon at the head of the cove. The location is accurate to within 1,200 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Arsenic Secondary
Mercury Secondary

Materials information

Materials Type of material
Pyrite Ore

Nearby scientific data

(1) -160.45242, 55.30924

Comments on the geologic information

  • Geologic Description = At this site two dome-shaped bodies of porphyritic, pyrite-bearing, andesite crop out in an area mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). The domes exhibit sheeted jointing and are accompanied by radiating dikes. Ellis (1988) suggests that they occur on the side of a vent complex. Of 12 rock samples, only one contained gold (0.44 ppm). The sample also contained 202 ppm arsenic, and 0.88 ppm mercury. Most of the samples contained anomalous mercury. A few pan samples contained weakly anomalous gold (0.11 to 0.38 ppm) and mercury (0.195 to 1.35 ppm).
  • 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 = In 1988 Battle Mountain Exploration Company examined the occurrence and collected 12 rock and 12 pan samples. Only one sample contained detectable gold (0.44 ppm), as reported by Ellis (1988).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM098

Bibliographic references

  • Deposit

    Ellis, W.T., 1988, Unga/Alaska Peninsula project, 1988 report: Battle Mountain Exploration Company report, 64 p. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • 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 = Ellis, 1988

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 05-FEB-00 S.H. Pilcher U.S. Geological Survey