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Unnamed (south-southeast of Rainbow Mountain)

Occurrence, Inactive

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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 63.2855
Longitude -145.6091
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 5,800 feet on the crest of Rainbow Ridge, 1.8 miles south-southeast of Rainbow Mountain. It is at the center of section 10, T. 19 S., R. 11 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 8), and it corresponds to locality 23 in Cobb (1979 [OFR 79-238]) and locality S113 in table 2 of Nokelberg and others (1991). It is a quarter-mile southeast of MH230.

Geologic setting

Geologic description

This occurrence consists of two quartz veins as much as 2 feet thick and several smaller veins that contain chalcopyrite, galena, pyrite, and traces of gold and silver (Hanson, 1963). The veins strike N5W, dip 83W, cut andesite to dacite flow breccia, and are truncated on the north by a thrust fault. The flow breccias are part of the Tetelna Volcanics of Pennsylvanian age (Nokleberg and others, 1991). Samples of the mineralized veins assayed 0.3 to 0.4 percent copper, 0.5 to 0.6 percent lead, and a trace each of gold and silver (Hanson, 1963).
Geologic map unit (-145.611346330933, 63.2850878733463)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Pennsylvanian or younger.

Production and reserves

Workings or exploration Samples of the mineralized veins assayed 0.3 to 0.4 percent copper, 0.5 to 0.6 percent lead, and a trace each of gold and silver (Hanson, 1963).
Indication of production None

References

MRDS Number A011801

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