Unnamed (Left Fork) (ARDF #BN117) Cu

Unnamed (Left Fork)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Other commodities	Ag
Ore minerals	chalcopyrite

Geographic location

Quadrangle map, 1:250,000-scale	BN
Quadrangle map, 1:63,360-scale	C-6
Latitude	65.52
Longitude	-164.71
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at the mouth of Left Fork, a west tributary to Kougarok River. It is 2.5 miles west of the Nome-Taylor road and about a 1,000 feet west of the mouth of Louisa Creek, a small east tributary to Kougarok River. This is locality 3 of Gamble (1988).

Geologic setting

Geologic description Gamble (1988) describes this occurrence as disseminated chalcopyrite in chlorite schist and reports one per cent copper and 15 ppm silver from one sample. Bedrock exposed in the area around the mouth of Left Fork is part of a mafic metavolcanic assemblage that Till and others (1986) consider to be Ordovician in age.
Geologic map unit	(-164.712678287521, 65.51927033737)
Mineral deposit model	Unknown; possibly related to volcanogenic massive sulfide environment
Age of mineralization	Unknown; if the occurrence is related to a volcanogenic massive sulfide environment then mineralization would be Paleozoic in age.

Production and reserves

Indication of production	None

References

MRDS Number	10307284
References Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000. Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.
Reporters	Travis L. Hudson (Applied Geology)
Last report date	3/15/1999