Unnamed (south of Twaharpies Glacier) (ARDF #MC166) Cu

Unnamed (south of Twaharpies Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag; As

Geographic location

Quadrangle map, 1:250,000-scale	MC
Quadrangle map, 1:63,360-scale	B-4
Latitude	61.3621
Longitude	-142.2066
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is on a ridge south of Twaharpies Glacier. It is at an elevation of about 6,300 feet, 500 feet north-northwest of elevation 6745 in the SW1/4 of section 9, T. 6 S., R. 18 E. of the Copper River Meridian. This is locality 48 of MacKevett (1976); the location is accurate to within about 100 feet.

Geologic setting

Geologic description This occurrence consists of Triassic Nikolai Greenstone that is mineralized adjacent to a 15-meter-wide altered fault zone (MacKevett, and Smith, 1968, 1972; MacKevett, 1976). A sample of the mineralized rock contained 2 parts per million (ppm) silver, 7,000 ppm arsenic, and 15,000 ppm copper.
Geologic map unit	(-142.208643898392, 61.3616835428477)
Mineral deposit model	Vein and coatings

Production and reserves

Workings or exploration	Limited surface sampling.
Indication of production	None
Additional comments The locality is in the Wrangell-Saint Elias National Park and Preserve.

References

References MacKevett, E.M., Jr., 1976, Mineral deposits and occurrences in the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-773-B, 2 sheets, scale 1:250,000. MacKevett, E.M., Jr., and Smith, J.G., 1968, Distribution of gold, copper, and some other metals in the McCarthy B-4 and B-5 quadrangles, Alaska: U.S. Geological Survey Circular 604, 25 p. MacKevett, E.M., Jr., and Smith, J.G., 1972, Geologic map of the McCarthy B-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-943, 1 sheet, scale 1:63,360.
Reporters	Travis L. Hudson (Applied Geology, Inc.)
Last report date	1/12/2003