Unnamed (in upper Granite Creek) (ARDF #TK099) Ag, Cu, Zn

Unnamed (in upper Granite Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities	Ag; Cu; Zn
Ore minerals	chalcopyrite; pyrite; sphalerite
Gangue minerals	clay; quartz

Geographic location

Quadrangle map, 1:250,000-scale	TK
Quadrangle map, 1:63,360-scale	B-2
Latitude	62.2896
Longitude	-147.9462
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This prospect extends for 2 miles along upper Granite Creek. It is centered at an elevation of 5,200 feet, 0.4 mile due north of the center of sec. 3, T. 25 N., R. 8 E., Seward Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description This prospect consists of chalcopyrite, pyrite, and sphalerite(?) in a siliceous gouge zone near the contact between Upper Jurassic diorite and tuffaceous volcanic rocks of the Lower Jurassic, Talkeetna Formation (Kurtak and others, 1992). The gouge zone strikes N20E and dips 70 W. Rock samples from the south, valley wall of upper Granite Creek contain 1.2 part per million silver, 436 parts per million zinc, and 6,640 parts per million copper (Clautice and others, 1990). A U.S. Bureau of Mines 3.5-foot-long, chip sample of an iron-stained zone contains 0.87 percent zinc and 0.16 percent copper. A sulfide-rich float sample collected nearby contains 1.5 ounce silver per ton, 5.8 percent copper, and 2.4 percent zinc (Kurtak and others, 1992). This prospect may be genetically related to prospects at TK097 and TK098. Claims were staked in 1971 by Leo Mark Anthony, who conducted grid soil sampling and trenching.
Geologic map unit	(-147.948390446397, 62.2891253512902)
Mineral deposit model	Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number	22c
Alteration of deposit	Alteration includes clay and silicification in fault gouge. Iron-oxide staining.

Production and reserves

Workings or exploration	Claims were staked in 1971 by Leo Mark Anthony, who conducted grid soil sampling and trenching. Rock samples collected the Alaska Division of Geological and Geophysical Surveys and the U.S. Bureau of Mines (Clautice and others, 1990; Kurtak and others, 1992).
Indication of production	None
Additional comments MAS/MILS number 20760059.

References

MRDS Number	A106284
References Clautice, K.H., Harris, E.E., Liss, S.A., Kline, J.T., Bundtzen, T.K., Gilbert, W.G., and Nye, C.J., 1990, Analytical results for rock, pan concentrate, and stream sediment samples from the Talkeetna Mountains B-2 quadrangle and the northern part of the Talkeetna Mountains A-2 quadrangle: Alaska Division of Geological and Geophysical Surveys, Public Data File 90-31, 23 p., 1 plate, 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