Unnamed (near Renshaw Point)

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

Geologic information

Identification information

Deposit ID 10308104
Record type Site
Current site name Unnamed (near Renshaw Point)

Geographic coordinates

Geographic coordinates: -160.38243, 55.62124 (WGS84)
Relative position This occurrence is at an elevation of about 500 feet on the southwest side of Dorenoi Bay, about 1.25 miles northwest of Renshaw Point (Christie, 1974, color anomaly 74; MacKevett and Holloway, 1977, locality 20; Wilson and others, 1988, locality 20). 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 Secondary
Lead Secondary
Zinc Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Barite Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Moderate to strong carbonate alteration is present in most of the volcanic units. This may be a form of propylitic alteration.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -160.38243, 55.62124

Comments on the geologic information

  • Geologic Description = The area of this occurrence has been mapped by Wilson and others (1995) as Miocene volcanics. According to Butherus and others (1979), the area contains steeply northeast-dipping latite, andesite or basalt flows, and flow breccias overlying sandstone, shale, and conglomerate. The site is marked by a 10,000- by 5,000-foot color anomaly (Christie, 1974, number 74). Christie describes the deposit as quartz-calcite veins containing minor arsenopyrite, pyrite, sphalerite, and galena. The veins cut the volcanic rocks and strike nearly south. The veins become more numerous towards Renshaw Point and in one 100- by 200-foot area form a pyritic stockwork. Anderson and others (1980) describe the veins as being as much as 2 feet thick and occurring near prominent shear zones. They also note a 12- to 15-foot thick latite dike that crops out over a distance of 1,000 feet and contains disseminated sphalerite and galena. In many areas the rocks exhibit moderate to strong carbonate alteration, the largest area of which is in andesite or latite and is 100 feet wide and 4,000 feet long. Rock samples collected by Resource Associates of Alaska (Anderson and others,1980) from various veins and shear zones assayed as much as 11.5 percent copper, 1.47 percent lead, 11 percent zinc, 0.84 ounce of gold per ton, and 209 ounces of silver per ton. The latite dike with disseminated sulfides assayed as much as 0.39 ounce of gold per ton and 2 percent zinc.
  • 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) reconnaissance-mapped the area and collected eight silt or soil samples. All had detectable gold. Assays ranged from up to 0.03 ppm gold, 4.9 ppm silver, 200 ppm zinc, and low copper and molybdenum values. Rock samples collected by the U.S. Geological Survey studies in the mid-1980's (samples 83ADt 95 and 96) contained as much as 7 ppm silver. Five vein and shear samples collected by Resource Associates of Alaska in 1980 assayed as much as 11.5 percent copper, 1.47 percent lead, 11 percent zinc, 0.84 ounce of gold per ton, and 209 ounces of silver per ton.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PM028

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

    Butherus, D.L, Gressitt, E.E., Pray, J., Corner, N.G., Lindberg, P.H., and Fankhauser, R.E., 1979, Exploration and evaluation of the Aleut Native Corporation lands; Volume III: Resource Associates of Alaska, 69 p. 90 sheets, various sacales. (Report held by the Aleut Native Corporation, Anchorage, Alaska.)

  • Deposit

    Anderson, G.L., Butherus, D.L., Fankhauser, R.E., Pray, J.C., Lindberg, P.A., and Hoffman, B.L., 1980, Exploration and evaluation of lands leased from Aleut Native Corporation 1980; Resource Associates of Alaska Report, 84 p, 16 map sheets, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

  • Deposit

    Freeport Exploration Company, 1985, 1984 report of activities, Canoe Bay joint venture: Freeport Exploration Company, 25 p. (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.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Anderson and others, 1980

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold veins, Polymetallic veins (Cox and Singer, 1986; model 22c)
Deposit Other Comments = This site is located on land selected by the Aleut Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 06-JAN-01 S.H. Pilcher U.S. Geological Survey