Unnamed (northwest of Mud Lake) (ARDF #MH202) Cu

Unnamed (northwest of Mud Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	chalcocite; chrysocolla

Geographic location

Quadrangle map, 1:250,000-scale	MH
Quadrangle map, 1:63,360-scale	A-4
Latitude	63.0432
Longitude	-145.554
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is at an elevation of 3,100 feet on the northeast flank of Paxson Mountain, 1 mile northwest of Mud Lake. It is in the NE1/4NW1/4 section 1, T. 22 S., R. 11 E., Fairbanks Meridian. The occurrence corresponds to locality 4 in Rose and Saunders (1965).

Geologic setting

Geologic description Several pieces of copper-stained float containing minor chalcocite occur in a frost boil at this location (Rose and Saunders, 1965). The float is vesicular basalt of Nikolai Greenstone of Late Triassic age. The metabasalt is partly altered to epidote.
Geologic map unit	(-145.556221917734, 63.0427797805701)
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 basalt is partly altered to epidote (Rose and Saunders, 1965); copper mineral(s) are oxidized.

Production and reserves

Indication of production	None

References

References Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p. 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. Martin, G.C., 1920, The Alaska mining industry in 1918: U.S. Geological Survey Bulletin 712-A, p. 1-52. Mulligan, J.J., 1974, Mineral resources of the Trans-Alaska Pipeline corridor: U.S. Bureau of Mines Information Circular 8626, 24 p., 9 sheets, 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	6/19/2002