Unnamed (Rainbow Ridge south-southeast of Rainbow Mountain) (ARDF #MH230) Cu, Pb

Unnamed (Rainbow Ridge south-southeast of Rainbow Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu; Pb
Other commodities	Ag; Au
Ore minerals	chalcopyrite; galena; pyrite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	MH
Quadrangle map, 1:63,360-scale	B-4
Latitude	63.2878
Longitude	-145.618
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence at an elevation of 6,200 feet is near the crest of Rainbow Ridge 1.5 miles south-southeast of the top of Rainbow Ridge. It is in the NE1/4NW1/4 section 10, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 7). It corresponds to locality 22 in Cobb (1979 [OFR 79-238]) and locality S112 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description This occurrence consists of chalcopyrite, galena, and pyrite in vertical quartz veins as much as 8 feet wide that strike north-south and cut a Permian dacite intrusive (Hanson, 1963; Nokleberg and others, 1991). The dacite intrudes the Tetelna Volcanics of Permian age. A sample of mineralized vein contained 4,000 parts per million (ppm) copper, 6,000 ppm lead, and a trace each of silver and gold (Nokleberg and others, 1991).
Geologic map unit	(-145.620246986537, 63.2873878093325)
Mineral deposit model	Porphyry Cu (Cox and Singer, 1986; model 17).
Mineral deposit model number	17
Age of mineralization	Permian or younger.

Production and reserves

Workings or exploration	A sample of mineralized vein contained 4,000 parts per million (ppm) copper, 6,000 ppm lead, and a trace each of silver and gold (Nokleberg and others, 1991).
Indication of production	None

References

References Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p. Hanson, L.G., 1963, Bedrock geology of the Rainbow Mountain area, Alaska Range, Alaska: Alaska Division of Mines and Minerals Geologic Report 2, 82 p., 2 plates. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
Reporters	W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date	8/9/2002