Unnamed (east of Farragut Lake) (ARDF #SD064) Ag, Au, Cu

Unnamed (east of Farragut Lake)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities	Ag; Au; Cu
Ore minerals	bornite
Gangue minerals	epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale	SD
Quadrangle map, 1:63,360-scale	B-3
Latitude	57.28643
Longitude	-132.81355
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is near the top of peak 5150, which is about 6.0 miles east of the north end of Farragut Lake. It is about 0.3 mile southwest of the center of section 11, T. 53 S., R. 79 E.

Geologic setting

Geologic description This occurrence consists of bornite in quartz-epidote veinlets in biotite-hornblende quartz diorite, probably of Tertiary or Cretaceous age (Clark and others, 1970 [OF 70-73]). A sample contained 100 parts per million (ppm) copper, 10 ppm silver, and 0.6 ppm gold.
Geologic map unit	(-132.815253669319, 57.2860939847752)
Mineral deposit model	Bornite veinlets in quartz diorite.
Age of mineralization	Veinlets are younger than the quartz-diorite host rock, which is probably of Tertiary or Cretaceous age.
Alteration of deposit	Deposit consist of veinlets of quartz and epidote with bornite in quartz diorite.

Production and reserves

Workings or exploration	Only sampling by government geologists.
Indication of production	None

References

References Clark, A.L., Brew, D.A., Grybeck, D.J., and Wehr, Raymond, 1970, Analyses of rock and stream-sediment samples from the Sumdum B-3 quadrangle, Alaska: U.S. Geological Survey Open-File Report 70-73, 95 p., 1 sheet, scale 1:63,360.
Reporters	Donald Grybeck (U.S. Geological Survey)
Last report date	10/8/2004