Unnamed (north of upper Jay Creek) (ARDF #TK042) Cu

Unnamed (north of upper Jay Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	malachite
Gangue minerals	epidote; fluorite; quartz

Geographic location

Quadrangle map, 1:250,000-scale	TK
Quadrangle map, 1:63,360-scale	D-2
Latitude	62.847
Longitude	-147.7066
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of about 3,800 feet, about 3.5 miles west-northwest of the low pass between Jay Creek and Coal Creek It is near the center of sec. 23, T. 32 N., R. 9 E., Seward Meridian. The location is accurate. This is locality B34 of Kurtak and others (1992).

Geologic setting

Geologic description The rocks in the vicinity of this occurrence are chlorite schist, greenstone, and foliated granite (Kurtak and others, 1992). The greenstone is silicified and iron-stained; the chlorite schist is iron-stained. The occurrence consists of quartz float that contains malachite, fluorite, and epidote (Kurtak and others, 1992). A sample of malachite-bearing quartz contains 161 parts per million copper.
Geologic map unit	(-147.708834290918, 62.8465421416022)
Mineral deposit model	Porphyry Cu-Au? or Basaltic Cu? (Cox and Singer, 1986; model 20c? or 23?)
Mineral deposit model number	20c? or 23?
Alteration of deposit	Oxidation of copper mineral. The greenstone is silicified and iron-stained; the chlorite schist is iron-stained.

Production and reserves

Workings or exploration	Only limited surface sampling by U.S. Bureau of Mines (Kurtak and others, 1992).
Indication of production	None
Additional comments MAS/MILS number 20760094.

References

References 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	10/4/2002