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Junior

Prospect in Alaska, United States with commodities Silver, Gold, 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 10308132
Record type Site
Current site name Junior

Geographic coordinates

Geographic coordinates: -160.67641, 55.23623 (WGS84)
Relative position The Junior prospect is on Unga Island approximately 2.5 miles northeast of Acheredin Bay. The map site is near the top of hill 1055, in the NE1/4 of sec. 21, T. 57 S., R. 75 W., Seward Meridian (Wilson and others, 1988, locality 30). 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 A-3(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

Unga 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
Silver Primary
Gold Primary
Mercury Secondary

Materials information

Materials Type of material
Pyrite Ore
Calcite Gangue
Chalcedony Gangue
Chlorite Gangue
Jasper Gangue
Quartz Gangue
Zeolite Gangue

Alteration

  • (Local) The alteration consists of pervasive chloritization and local silicification.

Nearby scientific data

(1) -160.67641, 55.23623
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Junior prospect is a 4,000- by 200-foot area of quartz-pyrite-chlorite-zeolite veinlets, pyritic chalcedonic quartz veins, and pyrite-quartz stringers, all cutting chloritized andesite of the late Eocene to early Oligocene Popof volcanic rocks (Wilson and others, 1995). Gangue minerals also locally include calcite and jasper. Peterson and others (1982) believed that the prospect is at the intersection of northeast- and northwest-striking faults. In addition to being chloritized, the andesite is marked by local silicification near the veins, especially in areas of high vein density. Only sporadic occurrences of gold have been noted. The best values were 2.2 ppm gold and 14 ppm silver in a grab sample. In drill core, the highest gold values were 0.03 ppm over 5 feet and 0.02 ppm over 1, 5, and 10 feet (Trujillo and others, 1981). Silver was at least 0.1 ppm over the entire hole (522 feet), with best values at 2.75 ppm in three 3- to 5-foot sections. Mercury ranged from 0.1 to more than 10 ppm and arsenic from 205 to more than 1,000 ppm.
  • Age = Eocene or younger.

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 = In 1981 Resource Associates of Alaska mapped the prospect, collected 145 rock and 309 soil samples, conducted a magnetic survey, and drilled one hole for a total of 522 feet. Only low precious metal values were detected.

Reference information

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

    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 veins
Deposit Other Comments = This prospect is located on land patented by, or interim-conveyed to, the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 11-JAN-01 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.