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Unnamed (near Peak 4694)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals chalcopyrite; malachite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-4
Latitude 59.33
Longitude -136.33
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located at the head of Porcupine Creek, 0.3 miles southeast of Peak 4694 at an elevation of about 3,800 feet. It is shown as number 132 by Still and others (1984).

Geologic setting

Geologic description

The site of an isolated sample of chalcopyrite-bearing quartz float with malachite that contained 49 ppm gold, 74 ppm silver, and 1% copper. (Still and others, 1984). It occurs within a Cretaceous diorite (MacKevett and others, 1974) but may be associated with a small pendant within the diorite, like SK053 or SK052.
Geologic map unit (-136.33186797009, 59.3296561513805)
Mineral deposit model There is too little information to assign a model type.
Age of mineralization Probably Cretaceous or younger, based on the age of the surrounding diorite (MacKevett and others, 1974).

Production and reserves

Indication of production None

References

MRDS Number A013083

References

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.
Redman, E.C., Gilbert, W.G., Jones, B.K., Rosenkrans, D.S., and Hickok, B.D., 1985, Preliminary bedrock-geologic map of the Skagway B-4 quadrangle: Alaska Division of Geological and Geophysical Surveys Report of Investigations 85-6, 1 sheet, scale 1:40,000.
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.
Still, J.C., Weir, K.R., Gilbert, W.G., and Redman, Earl, 1984, Stream sediment, float, and bedrock sampling in the Porcupine mining area, southeast Alaska: U.S. Bureau of Mines Open-File Report 173-84, 6 p., 1 sheet, scale 1:250,000.
Reporters T.C. Crafford (T. Crafford & Associates, Anchorage)
Last report date 2/4/2001