|Quadrangle map, 1:250,000-scale||SK|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This prospect is on the south side of Mt. Ripinski approximately 0.5 mile south of triangulation station '3563'. It is at an elevation of approximately 1,500 feet near the base of a steep south-facing cliff. Redman and others (1984) show this site as occurrence 1, but they were unable to locate the 100-foot adit reported to occur at this site by Robertson (1956). The location is accurate to within about 0.25 mile.|
The following description is from Still and others (1991). Chalcopyrite-bornite-bearing quartz-calcite veins and chalcopyrite-bearing metabasalt occur in cliffs and in rubble beneath the cliffs on the south side of Mount Ripinski. Almost all of the quartz veins that were sampled contained low gold values, but some veins contained up to 12.0 ppm gold and 3.97% copper. The metabasalt contained up to 0.60 ppm gold and 3.50 % copper. Eighteen of the 27 samples were analyzed for platinum and palladium. They contained from 0.01 to 0.06 ppm palladium and one sample contained 0.01 ppm platinum. This site is immediately north of the Johnson Creek fault which separates metabasalt to the north from Cretaceous ultramafic rocks, including pyroxenite, to the south. Iron deposits associated with pyroxenite are also reported from this general area but no descriptions are given (Redman and others, 1984).The Cretaceous age of the metabasalts (Still and others, 1991; MacKevett and others, 1974) establishes a maximum age for the mineralization. However, based on fossil evidence from the Chilkat Peninsula to the southeast, Plafker, Hudson and Silberling (1979) and Plafker and Hudson (1980) infer a Late Triassic age for the metabasalts.
|Geologic map unit||(-135.515830367685, 59.2556725873889)|
|Mineral deposit model||Possible metamorphic quartz-sulfide veins in association with copper rich metabasalts and an iron-rich ultramafic intrusion (Cox and Singer, 1986; model 36a?).|
|Mineral deposit model number||36a?|
|Age of mineralization||Cretaceous or younger, or Late Triassic or younger (Plafker, Hudson and Silberling, 1979; Plafker and Hudson, 1980).|
|Workings or exploration||Redman and others (1984) refer to a report by Robertson (1956) of a 100-foot adit but were unable to find it.|
|Indication of production||None|
|Reserve estimates||Robertson (1956) indicates that several billion tons of material with 2 to 10% iron may exist in this area.|
Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale 1:600,000.
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,
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.
Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.
Robertson, E.C., 1956, Magnetite deposits near Klukwan and Haines, southeast Alaska: U.S. Geological Survey Open-File Report 56-101, 37 p.
Still, J.C., 1991, Section A: Haines - Klukwan - Porcupine subarea, in U.S. Bureau of Mines, Mineral investigations in the Juneau Mining District, Alaska, 1984-1988: Volume 2 - Detailed mine, prospect, and mineral occurrence descriptions: U.S. Bureau of Mines Special Publication VOL. 2A, 214 p., 9 sheets.
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.
|Reporters||T.C. Crafford (T. Crafford & Associates, Anchorage)|
|Last report date||2/4/2001|