Unnamed Occurrence (ARDF - SK033; along the Haines Highway), Skagway District, Juneau District, Haines Borough, Alaska, USA
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Location: This occurrence is along the Haines Highway between mileposts 15 and 16. It is about 5.8 miles southeast of the village of Klukwan. It is shown as sample sites 790 and 791 on sheet 2 of Gilbert and others (1991).
Geology: Gilbert and others (1991) collected several samples of quartz veins in metabasalt at this site that contained chalcopyrite, pyrite, malachite, and sphalerite. The samples contained up to 0.686 ppm gold, 2.4 ppm silver, 3,990 ppm copper, and 1.85% zinc. According to MacKevett and others (1974), the metabasalts exhibit a gradational contact with the Klukwan ultramafic complex and they considered both to be of Cretaceous age. Later workers (Plafker, Hudson and Silberling, 1979; Plafker and Hudson, 1980) assign a Late Triassic age to the metabasalts based on fossil evidence from the Chilkat Peninsula. Gilbert and others (1987) accept the Late Triassic age for the metabasalt and comment that it is juxtaposed against the plutonic rocks, including the Klukwan complex, to the east by the Tukgahgo Mountain fault, which strikes northwest and dips steeply. The veins and their settings appear similar to those at the Road Cut prospect (SK006) and unnamed occurrences (SK001, SK003) to the southeast. The Late Triassic age of the host rocks establishes a maximum age for the veins.
Age: Late Triassic or younger based on the age of host rocks (Gilbert and others, 1987).
Commodities (Major) - Ag, Au, Zn; (Minor) - Cu
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral List
5 entries listed. 5 valid minerals.
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References
Gilbert, W.G., Burns, L.E., Redman, E.C., and Forbes, R.B., 1987, Preliminary bedrock geology and geochemistry of the Skagway B-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 87-2, 2 sheets, scale 1:36,200. 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, 75 p., 2 sheets, scale 1:63,360, 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., 1 plate. 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. Plafker, George, Hudson, T.L., and Silberling, N.J., 1979, Late 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. Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988; Volume 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. 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.
