Unnamed (near Battery Point on the Chilkat Peninsula)

Occurrence in Alaska, United States with commodities Copper, Gold

Geologic information

Identification information

Deposit ID 10002207
MRDS ID A013108
Record type Site
Current site name Unnamed (near Battery Point on the Chilkat Peninsula)
Related records 10185777

Geographic coordinates

Geographic coordinates: -135.37209, 59.19975 (WGS84)
Relative position This occurrence is at an elevation of approximately 300 feet on the east side of the the Chilkat Peninsula about 0.5 miles south of Battery Point. It corresponds to location 19 of Cobb (1972 [MF 424]); sample site BD473 of Winkler and MacKevett, (1970); and number 38 of Still and others (1991).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Epidote Gangue

Alteration

  • (Local) Epidotization.

Host and associated rocks

  • Host or associated Host
    Chronological age 108.5
    Stratigraphic age (youngest) Early Cretaceous

Nearby scientific data

(1) -135.37209, 59.19975

Comments on the geologic information

  • 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.
  • 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.
  • Age = Chron age is for ultramafic body nearby and host rock is Late Triassic.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013108
USGS Alaska Resource Data File ARDF SK004

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Still, 1988

General comments

Subject category Comment text
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.
Deposit Other Comments = This occurrence is within the Chilkat State Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates