Pmrgx-4

Occurrence in Alaska, United States with commodities Silver, Gold, Copper

Geologic information

Identification information

Deposit ID 10308080
Record type Site
Current site name Pmrgx-4

Geographic coordinates

Geographic coordinates: -161.59542, 55.08421 (WGS84)
Relative position This occurrence is located just south of a perennial stream outlet on the west shore of Poperechnoi Island (Christie, 1974, color anomaly 69; Wilson and others, 1988, locality 53). It is referred to as PMRGX-4 in Wilson and others (1988). The location is accurate to within 1,200 feet.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary

Materials information

Materials Type of material
Pyrite Ore

Alteration

  • (Local) Christie (1974) reported epidote and chlorite, indicating probable propylitic alteration.

Nearby scientific data

(1) -161.59542, 55.08421

Comments on the geologic information

  • Geologic Description = This site represents a spotty color anomaly 1 mile in diameter (Christie, 1974, color anomaly 69), developed around granodiorite that intrudes upper Miocene volcanic and epiclastic rocks (Wilson and others, 1995). Christie's examination was brief, and he examined only the edge of the anomaly. He reported probable propylititc alteration, and collected two silt samples, one of which contained 0.02 ppm gold. Mapping in the mid-1980's by the U.S. Geological Survey elsewhere in this general area revealed a hypabyssal andesite intrusion into mineralized sandstone of the Oligocene to Miocene Belkofski Formation (Wilson and others, 1988). Samples of mineralized rock were anomalous in copper and silver.
  • Age = Miocene 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 = Christie (1974) collected two silt samples, one of which contained 0.02 ppm gold. Rock samples AJm733-734 collected elsewhere in the general area by the U.S. Geological Survey in the mid-1980s (samples 84AJm733-734) were reported to be anomalous in copper and silver (Wilson and others, 1988).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM002

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 Other Comments = This site is on land selected by the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-JAN-01 S.H. Pilcher U.S. Geological Survey