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Unnamed (west of Mud Lake)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcopyrite; chrysocolla
Gangue minerals actinolite; epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-4
Latitude 63.035
Longitude -145.5433
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 3,100 feet one-half mile west of Mud Lake. It is in the SE1/4SE1/4 section 1, T. 22 S., R. 11 E., Fairbanks Meridian. The occurrence corresponds to locality 1 in Rose and Saunders (1965) and locality S95 of table 2 in Nokleberg and others (1991).

Geologic setting

Geologic description

At this locality bornite-chalcopyrite quartz veins several inches or less thick cut vesicular metabasalt of Nikolai Greenstone of Late Triassic age (Rose and Saunders, 1965). The veins strike N85W and dip 75N. Chrysocolla occurs nearby in vesicles in epidotized basalt. Asbestiform actinolite occurs in one vein.
Geologic map unit (-145.545520726995, 63.0345796470829)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization Late Triassic or Cretaceous.
Alteration of deposit The vesicular basalt is altered to chlorite epidote and quartz; copper mineral(s) are oxidized.

Production and reserves

Indication of production None

References

MRDS Number A011810

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
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., and Saunders, R.H., 1965, Geology and geochemical investigations near Paxson, northern Copper River basin, Alaska: Alaska Division of Mines and Minerals Geological Report 13, 35 p.
Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 6/18/2002