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Pmrgx-5

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Molybdenum, Lead, 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. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308082
Record type Site
Current site name Pmrgx-5

Geographic coordinates

Geographic coordinates: -161.82243, 55.18021 (WGS84)
Relative position This occurrence, located on the northern tip of Dolgoi Island, represents a 6,000- by 3,000-foot color anomaly (Christie, 1974, anomaly 66; Wilson and others, 1988, locality 54). The map site is 1,500 feet north of hill 950, near the center of the anomaly. The site is referred to as PMRGX-5 by Wilson and others (1988).

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-6(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

Belkofski 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 Primary
Molybdenum Secondary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Alteration

  • (Local) Christie (1974) noted the presence of epidote, chlorite, and fine-grained sericite.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4
Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2
Model code 78
USGS model code 20c
Deposit model name Porphyry Cu-Au
Mark3 model number 34

Nearby scientific data

(1) -161.82243, 55.18021
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Christie (1974) described a 6,000- by 3,000-foot color anomaly, elongate east-west and truncated at the coast on the north. Rocks in the area of the anomaly consist of altered granodiorite and diorite porphyry that intrude volcaniclastic rocks of the Oligocene to Miocene Belkofski Formation (Wilson and others, 1988). Abundant sulfides, including chalcopyrite and pyrite, are present, especially near the contact with the diorite porphyry. Moderate fracturing is widespread. Alteration minerals include chlorite, epidote, and fine-grained sericite. Christie collected three soil or silt samples containing as much as 0.04 ppm gold, 2.3 ppm silver, 151 ppm zinc, 575 ppm copper and 11 ppm molybdenum. Samples collected by the U.S. Geological Survey were anomalous in copper, lead, and zinc (Wilson and others, 1988).
  • Age = Oligocene 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 = During his brief reconnaissance, Christie (1974) collected three silt or soil samples that contained as much as 0.04 ppm gold, 2.3 ppm silver, 151 ppm zinc, 575 ppm copper, and 11 ppm molybdenum. Rock samples 84AAi79 and 84AJm715, collected by the U.S. Geological Survey in the mid-1980s, were anomalous in copper, lead, and zinc (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 = Wilson and others, 1988

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu, Porphyry Cu-Mo, Porphyry Cu-Au (Cox and Singer, 1986; models 17, 21a, 20c)
Deposit Model Number = 17, 21a, 20c
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 20-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.