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Stemwinder

Occurrence in Alaska, United States with commodities Gold, Arsenic, Mercury
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308685
Record type Site
Current site name Stemwinder

Geographic coordinates

Geographic coordinates: -160.57742, 55.32723 (WGS84)
Relative position This occurrence is on Unga Island approximately 4,000 feet east of Coal Harbor. The map site is at an elevation of 200 feet, 0.25 mile east-southeast of the top of hill 358, in the SW1/4 of sec. 14, T. 56 S., R. 74 W., Seward Meridian.The location is accurate to within 1,200 feet.

Site location context

Political divisions (FIPS codes)

Aleutians East(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Port Moller B-2(quadrangle 1:63,360 scale)

Unga Island(quadrangle 1:100,000 scale)

Port Moller(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Cold Bay(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Shumagin Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Arsenic Critical Secondary
Mercury Secondary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • The host rock exhibits argillic alteration.

Nearby scientific data

(1) -160.57742, 55.32723
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This site consists of a 200-foot long, northwest-trending quartz-pyrite stockwork. The stockwork comprises quartz veins 0.5 to 6 inches thick that contain pyrite laminations and clots. The host rock is argillically altered andesite mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). Of 19 rock samples, two contained gold (0.04 and 0.22 ppm) and three contained mercury (0.15 to 1.55 ppm). Pan samples contained as much as 1.2 ppm gold (Ellis, 1988).
  • Age = Eocene or younger.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

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 this site and collected 19 rock, 32 soil, and 12 pan samples. Only two rock samples contained anomalous gold values (0.04 and 0.22 ppm).

Reference information

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 Model Name = Epithermal gold veins
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 04-FEB-2001 S.H. Pilcher U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.