Unnamed (in the Takshanuk Mountains) (ARDF #SK027) Ag, Au, Cu

Unnamed (in the Takshanuk Mountains)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Ag; Au; Cu
Ore minerals	bornite; chalcopyrite; gold; hematite; malachite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	SK
Quadrangle map, 1:63,360-scale	B-2
Latitude	59.32
Longitude	-135.67
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is near the top of Peak 4920 in the Takshanuk Mountains; it is approximately 1.9 miles northwest of Tukgahgo Mountain in the NW1/4, section 33, T. 29 S., R. 58 E. of the Copper River Meridian. It is shown as number 28 by Berg and others (1981); mineral occurrence number 5 on sheet 1 of Redman and others (1984); and number S045 by Wells and others (1986).

Geologic setting

Geologic description Redman and others (1984) describe this occurrence as, 'Malachite-stained quartz veins that cut diorite and carry chalcopyrite and bornite.' The veins trend N25E and dip 55E. They can be traced for at least 330 feet and occupy a zone 80 feet wide. A sample of mineralized vein contained 5.73% copper and 21 ppm silver. The mineralization is near a metabasalt body that is probably a pendant within the mid-Cretaceous, Mount Kashagnak pluton. This is probably the same occurrence referred to by Buddington and Chapin (1929) who report bornite and hematite from quartz veins about 10 miles northwest of Haines.
Geologic map unit	(-135.671833468136, 59.3196725725063)
Mineral deposit model	Quartz sulfide veins (Cox and Singer, 1986; model 36a or 22c),
Mineral deposit model number	36a or 22c
Age of mineralization	Mid-Cretaceous or younger based on age of the Mount Kashagnak pluton (Redman and others, 1984).

Production and reserves

Indication of production	None

References

MRDS Number	A013103
References 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. Berg, H.C., Decker, J.E., and Abramson, B.S., 1981, Metallic mineral deposits of southeastern Alaska: U.S. Geological Survey Open-File Report 81-122, 136 p., 1 sheet, scale 1:1,000,000. Buddington, A.F., and Chapin, Theodore, 1929, Geology and mineral deposits of southeastern Alaska: U.S. Geological Survey Bulletin 800, 398 p. 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. 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. 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. 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. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters	T.C. Crafford (T. Crafford & Associates, Anchorage)
Last report date	2/4/2001