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Unnamed (south of Millers Roadhouse)

Occurrence, Inactive

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Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.3325
Longitude -145.7299
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 2,650 feet just east of the Richardson Highway approximately 2.5 miles south of Millers Roadhouse. It is in the NE1/4NE1/4 section 25, T. 18 S., R. 10 E., Fairbanks Meridian. The occurrence is described by Hanson (1963, locality 3), and it corresponds to locality 18 in Cobb (1979 [OFR 79-238]) and locality S103 in table 2 of Nokelberg and others (1991).

Geologic setting

Geologic description

This occurrence consists of discontinuous and irregular quartz veins as much as 6 inches thick that contain disseminated chalcopyrite, galena, and pyrite (Hanson, 1963). Some of the chalcopyrite is oxidized to azurite and malachite. The veins cut metadacite of the Slana Spur Formation of Pennsylvanian age (Nokleberg and others, 1991). A grab sample of a three-quarter-inch quartz vein with chalcopyrite, malachite, and azurite contained 5,600 parts per million (ppm) copper, 180 ppm lead, 4,200 ppm zinc, 10 ppm silver, and 5,000 ppm arsenic (Nokleberg and others, 1991). Samples of the mineralized quartz veins assayed 0.4 to 0.5 percent copper, 0.4 to 0.5 percent lead, and a trace of gold (Hanson, 1963).
Geologic map unit (-145.732155087061, 63.3320868871175)
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 A grab sample of a three-quarter-inch quartz vein with chalcopyrite, malachite, and azurite contained 5,600 parts per million (ppm) copper, 180 ppm lead, 4,200 ppm zinc, 10 ppm silver, and 5,000 ppm arsenic (Nokleberg and others, 1991). Samples of the mineralized quartz veins assayed 0.4 to 0.5 percent copper, 0.4 to 0.5 percent lead, and a trace of gold (Hanson, 1963).
Indication of production None

References

MRDS Number A011797

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.
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.
Rose, A.W., 1965, Geology and mineral deposits of the Rainy Creek area, Mt. Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 14, 57 p., 1 sheet, scale 1:36,000.
Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 8/9/2002