Unnamed (northwest flank of Rainy Mountain) (ARDF #MH160) Cu

Unnamed (northwest flank of Rainy Mountain)

Prospect, Active

Alternative names

Copter lode

Commodities and mineralogy

Main commodities	Cu
Other commodities	Au
Ore minerals	chalcopyrite; pyrrhotite
Gangue minerals	chlorite; epidote; garnet

Geographic location

Quadrangle map, 1:250,000-scale	MH
Quadrangle map, 1:63,360-scale	B-4
Latitude	63.2783
Longitude	-145.8714
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The approximate location of this prospect is at an elevation of 3,300 feet on the northwest flank of Rainy Mountain. It in the SE1/4SW1/4 section 8, T. 19 S., R. 10 E., Fairbanks Meridian. The location is within a mile of Cobb's locality 8 (1979 [OFR-79-238]) and locality S80 in table 2 of Nokleberg and others (1991). Martin (1920) described copper deposits 7 miles from Millers Roadhouse, and the Copter lode claims are also in the area (Brooks, 1918; Mulligan, 1974). No evidence of surface workings or mineralization was found at these claims in 1993 (W.T. Ellis, oral communication, 1996).

Geologic setting

Geologic description Chalcopyrite- and pyrrhotite-bearing diorite and altered limestone (skarn) reportedly were collect in this area by A.H. McNeer (Brooks, 1918). The Copter lode prospect consists of sparse chalcopyrite and pyrrhotite and minor gold in garnet-epidote-chlorite skarn hosted in limestone of the Eagle Creek Formation of Pennsylvanian age and in adjacent Triassic gabbro (Nokleberg and others, 1991).
Geologic map unit	(-145.873653587087, 63.2778826503655)
Mineral deposit model	Cu skarn (Cox and Singer, 1986; model 18b).
Mineral deposit model number	18b
Age of mineralization	Late Paleozoic or Triassic.
Alteration of deposit	A specimen from the prospect was an altered limestone skarn made up of garnet, epidote, and chlorite and disseminated sulfides.

Production and reserves

Workings or exploration	Surface workings with 'considerable crosscutting' were reported by Martin (1920). The occurrence is on active claims of MAN Resources.
Indication of production	None

References

MRDS Number	A011790
References Brooks, A.H., 1918, Mineral resources of Alaska, 1916: U.S. Geological Survey Bulletin 662, 469 p. 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. 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. 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	6/7/2002