Unnamed (near Renshaw Point)

Site Name

Primary: Unnamed (near Renshaw Point)

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Commodity

Primary: Silver
Primary: Gold
Secondary: Zinc
Secondary: Copper
Secondary: Lead

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Location

State: Alaska
District: Alaska Peninsula

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Polymetallic veins

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Moderate to strong carbonate alteration is present in most of the volcanic units. This may be a form of propylitic alteration.

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Gold
Ore: Galena
Ore: Arsenopyrite
Gangue: Calcite
Gangue: Barite
Gangue: Quartz

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Comments

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Miocene or younger.

Comment (Reference): Primary Reference = Anderson and others, 1980

Comment (Workings): 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.

Comment (Deposit): Model Name = Epithermal gold veins, Polymetallic veins (Cox and Singer, 1986; model 22c)

Comment (Geology): 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.

Comment (Deposit): Other Comments = This site is located on land selected by the Aleut Corporation.

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References

Reference (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.

Reference (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.

Reference (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.)

Reference (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.)

Reference (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.

Reference (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.)

Reference (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.)

Reference (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.

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