Unnamed (near Peak 5420)

Site Name

Primary: Unnamed (near Peak 5420)

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Commodity

Primary: Silver
Secondary: Arsenic
Secondary: Copper
Secondary: Gold
Secondary: Barium-Barite
Secondary: Nickel
Secondary: Antimony
Secondary: Zinc

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Location

State: Alaska
District: Juneau (Skagway subdistrict)

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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: Prospect
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

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Pyrrhotite
Ore: Chalcopyrite
Gangue: Quartz

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Comments

Comment (Exploration): Status = Probably inactive

Comment (Deposit): Model Name = Based on limited information, these are probably polymetallic quartz veins (Cox and Singer, 1986; model 22c).

Comment (Geology): Age = Probably Cretaceous or younger based on the age of the surrounding diorite (MacKevett and others, 1974).

Comment (Reference): Primary Reference = Still and others, 1991

Comment (Workings): Workings / Exploration = Discovered by Merill Palmer in 1984.

Comment (Geology): Geologic Description = According to Still and others (1991), this prospect was discovered by Merril Palmer in 1984. It consists of swarms of quartz veins in slate and metabasalt exposed in prominent cliffs that (like SK052) appear to be in a roof pendant surrounded by diorite. The veins average about 0.5 to 1.5 feet thick and extend for hundreds of feet along strike. The vein swarms are many hundreds of feet across and extend for more than a thousand feet vertically. Sixty samples were collected from the veins and surrounding wall rocks. Gold values were generally low; 6 samples, mostly of quartz veins, contained 0.005 to 0.09 ppm gold. The 60 samples also contained up to 2.4 ppm silver, 390 ppm zinc, 150 ppm copper, 3,000 ppm barium, 700 ppm arsenic, 200 ppm nickel, and 3,000 ppm antimony. Samples collected through 1,500 feet of elevation and 4,000 feet across structure showed no potentially economic gold values. The sedimentary and basaltic protoliths to the slate and metabasalt are Paleozoic in age . The veins and mineralization are probably Cretaceous or younger in age, based on their probable genetic relationship to the surrounding diorite (MacKevett and others, 1974).

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References

Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.

Reference (Deposit): Still, J.C., Weir, K.R., Gilbert, W.G., and Redman, E.C., 1984, Stream-sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 173-84, 19 p.

Reference (Deposit): MacKevett, E.M., Jr., Robertson, E.C., and Winkler, G.R., 1974, Geology of the Skagway B-3 and B-4 quadrangles, southern Alaska: U.S. Geological Survey Professional Paper 832, 33 p.

Reference (Deposit): Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.

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