Unnamed (near Battery Point on the Chilkat Peninsula)

Site Name

Primary: Unnamed (near Battery Point on the Chilkat Peninsula)

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Commodity

Primary: Copper
Secondary: Gold

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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: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Epidotization.

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Rocks

Role: Host
Age Type: Associated Rock
Age in Years: 108.500000+-
Age Young: Early Cretaceous

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Analytical Data

Not available

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Materials

Ore: Chalcopyrite
Ore: Malachite
Gangue: Epidote

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Comments

Comment (Deposit): Other Comments = This occurrence is within the Chilkat State Park.

Comment (Geology): Age = The age of the mineralization is not well established. It can be no older than the Late Triassic age of the host rocks and may be related to the 108-109 m.y. old ultramafic body nearby.

Comment (Geology): Age = Chron age is for ultramafic body nearby and host rock is Late Triassic.

Comment (Deposit): Model Name = There is little information for assigning a deposit model. The mineralization may be related to elevated copper levels in the metabasalts or to the nearby ultramafic body.

Comment (Exploration): Status = Probably inactive

Comment (Geology): Geologic Description = Winkler and MacKevett (1970) describe a sample from this occurrence as a, 'Chalcopyrite-epidote-rich greenstone/amphibolite (?),' which contains 300 ppm Cu. Still (1988) says this occurrence is, 'where a 100-foot-high metabasalt cliff has a few patches of malachite stain.' Samples contained up to 0.51 ppm gold and 2,650 ppm copper. Plafker, Hudson, and Silberling (1979) and Plafker and Hudson (1980) note that metabasalts on the Chilkat Peninsula are vesicular and/or amygdaloidal and that well-developed pillow textures are locally present. Based in part on fossil evidence that supports a Late Triassic (Karnian) age, they suggest that the metavolcanics and carbonates may correlate with similar rocks of the Wrangellia terrane. This site is located near an ultramafic body which is probably 108-109 m.y. old based on potassium-argon ages reported by MacKevett and others (1974) for pyroxenite at Battery Point . The age of the mineralization is not well established, but can be no older than the Late Triassic age of the host rocks. It may be related to the ultramafic body whose age is 108-109 m.y.

Comment (Reference): Primary Reference = Still, 1988

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References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, scale 1:250,000.

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): Winkler, G.R., and MacKevett, E.M., Jr., 1970, Analyses of bedrock and stream-sediment samples from the Haines-Porcupine region, southeastern Alaska: U.S. Geological Survey Open-File Report 369, 91 p., 1 sheet, scale 1:125,000.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mt. Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-316, 123 p.

Reference (Deposit): Plafker George, Hudson, T.L., and Silberling, N.J., 1979, Upper Triassic fossils from a sequence of volcanic and sedimentary rocks on the Chilkat Peninsula, southeastern Alaska, in Johnson, K.M., and Williams, J.R., eds., The United States Geological Survey in Alaska: Accomplishments during 1978: U.S. Geological Survey Circular 804-B, p. B107-B110.

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., 1988, Gold-copper Mineralization of the Chilkat Peninsula and Islands: U.S. Bureau of Mines Open-File Report 49-88, 39 p., 11 sheets.

Reference (Deposit): Gilbert, W.G., Still, J.C., Burns, L.E., Wier, K.R., and Redman, E.C., 1991, Geochemistry of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-5, 1 sheet, scale 1:63,360, 75 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.

Reference (Deposit): Plafker, George, and Hudson, T., 1980, Regional implications of Upper Triassic metavolcanic and metasedimentary rocks on the Chilkat Peninsula, southeastern Alaska: Canadian Journal of Earth Sciences, v. 17, p. 681-689.

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