Unnamed (northeast of VABM Watana) (ARDF #TK037) Cu

Unnamed (northeast of VABM Watana)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; Au
Ore minerals	bornite; chalcopyrite; covellite
Gangue minerals	epidote; garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale	TK
Quadrangle map, 1:63,360-scale	D-2
Latitude	62.9652
Longitude	-147.8307
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 5,000 feet, 0.5 mile north-northeast of VABM Watana. It is near the center of the NE1/4 sec. 36, T. 22 S., R. 2 W., Fairbanks Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description This occurrence consists of bornite, covellite, and chalcopyrite in garnet-epidote-quartz skarn and hornfels (Kurtak and others, 1992). The skarn grades into marble that is part of a sequence of Triassic metabasalt, argillite, metachert, and marble (Csejtey and others, 1978). Selected samples of the mineralized skarn contain 3.5 parts per million silver, 0.2 parts per million gold, and up to 0.26 percent copper (Balen, 1990). As of January 1, 2000, a block of approximately 96 state mining claims covered this and adjacent prospects (Northern Associates Inc., written communication, 2001).
Geologic map unit	(-147.832950955314, 62.9647449292332)
Mineral deposit model	Copper skarn (Cox and Singer, 1986; model 18b)
Mineral deposit model number	18b
Alteration of deposit	Silicification and development of garnet-epidote skarn.

Production and reserves

Workings or exploration	Limited sampling by U.S. Bureau of Mines (Balen, 1990). As of January 1, 2000, a block of approximately 96 state mining claims covered this and adjacent prospects (Northern Associates Inc., written communication, 2001).
Indication of production	None
Additional comments MAS/MILS number 20760086.

References

MRDS Number	A106269
References Balen, M.D., 1990, Geochemical sampling results from Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 sheets, scale 1:63,360. Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000. Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Reporters	R.K. Rogers (U. S. Geological Survey contractor)
Last report date	10/2/2002