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Pmrgx-3

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Molybdenum, Lead, Antimony, Tin, Zinc
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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 10308142
Record type Site
Current site name Pmrgx-3

Geographic coordinates

Geographic coordinates: -160.67141, 55.16923 (WGS84)
Relative position The map site of this occurrence is on Unga Island on the east shore of outer Acheredin Bay, about 1.9 miles south of the lagoon at the head of the bay (Christie, 1974, color anomaly 80; Wilson and others, 1988, locality 85). It is referred to as PMRGX-3 (Smoker) in Wilson and others (1988). The location is accurate to within 1,200 feet.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Port Moller A-3 NE(quadrangle 1:24,000 scale)

Unga Island(quadrangle 1:100,000 scale)

Port Moller(quadrangle 1:250,000 scale)

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
Copper Secondary
Molybdenum Secondary
Lead Secondary
Antimony Critical Secondary
Tin Critical Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Pyrite Ore

Alteration

  • (Local) Extensive intense clay-pyrite alteration (acid sulfate?).

Nearby scientific data

(1) -160.67141, 55.16923
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence consists of a 1- by 2-mile color anomaly (Christie, 1974, color anomaly 80). At this site, Christie noted 6-inch to 3-foot-thick 'beds' of intensely argillized volcanic rock containing as much as 20 percent pyrite. The average pyrite content is 2 to 5 percent. A fractured diorite dike containing disseminated pyrite also crops out in the area. Two rock samples collected by Christie in 1974 contained as much as 0.01 ppm gold, 2.1 ppm silver, 98 ppm copper, 49 ppm zinc, and 1.6 ppm molybdenum. The country rocks are mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995). Six rock samples collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in antimony, copper, gold, lead, silver, and tin (Wilson and others, 1988).
  • Age = Eocene or younger.

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 = An Aleut-Quintana-Duval joint venture carried out brief reconnaissance mapping and sampling in 1974 (Christie, 1974). Only minor amounts of base and precious metals were found. UNC Teton Exploration Drilling Company geologists examined the site during the period 1979-1981. They called it a 'smoker-type' occurrence, but found little of interest. Samples collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in antimony, copper, gold, lead, silver, and tin (Wilson and others, 1988).

Reference information

Bibliographic references

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Angeloni, L.M., Wilson, F.H., and Sutlet, S., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 map sheet, scale 1:250,000.

  • 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 = Christie, 1974

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 27-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.