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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Zn
Ore minerals chalcopyrite; pyrrhotite; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale D-2
Latitude 60.96
Longitude -153.51
Nearby scientific data Find additional scientific data near this location
Location and accuracy About 3 km northwest of Telaquana Pass, on a mountain peak surrounded by glaciers. Locality 38 of MacKevett and Holloway (1977). Sec. 15, T. 10 N., R. 24 W., of the Seward Meridian. Location accurate within 1.6 km.

Geologic setting

Geologic description

Skarn deposit; marble interbedded with schist, phyllite, and metamorphosed mafic volcanic rocks in a large roof pendant in granitic rocks (Nelson and others, 1983). Mineralization consists of pyrite, pyrrhotite and minor amounts of chalcopyrite and sphalerite in granitic rocks and in metasedimentary roof pendants (MacKevett and Holloway, 1977). Quite similar to the nearby Glacier Fork occurrence (ARDF number LC008) and another unnamed occurrence (ARDF number LC010).
According to Nelson and others (1983, unit MzPzm), some of the metasedimentary rocks may correlate with the Kakhonak Complex of Permian(?), Triassic, and Jurassic age in the Iliamna quadrangle, and some may be graywacke of Jurassic and Cretaceous (?) age that has been metamorphosed by nearby plutonic rocks. Some of the metamorphosed volcanic rocks, especially in roof pendants, are probably part of the volcanic rocks of Tertiary age (Tv). Nelson and others (1983, unit Ti16) describe the granitic rocks as medium-gray, medium-grained biotite-hornblende granodiorite. Potassium-argon dates on biotite and hornblende from one specimen of this unit yielded ages of about 31 to 35 m.y. (Reed and Lanphere, 1972; 1973).
Geologic map unit (-153.51226607024, 60.9593463103257)
Mineral deposit model Porphyry Cu or Cu skarn (Cox and Singer, 1986; model 17 or 18b)
Mineral deposit model number 17 or 18b
Age of mineralization The granodiorite that produced the skarn has potassium-argon dates on biotite and hornblende of about 31 to 35 m.y. (Reed and Lanphere, 1972; 1973).

Production and reserves

Indication of production None

Additional comments

Site is in Lake Clark National Park and Preserve.

References

MRDS Number A106365

References

Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.
Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part B, Lists of references to Januray 1, 1981: U.S. Geological Survey Open-File Report 81-1343-B, 20 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, 1 sheet, scale 1:250,000.
Reed, B.L., and Lanphere, M.A., 1972, Generalized geologic map of the Alaska-Aleutian range batholith showing potassium-argon ages of the plutonic rocks: U.S. Geological Survey Miscellaneous Field Studies Map MF-372, 2 sheets, scale 1:1,000,000.
Reed, B.L., and Lanphere, M.A., 1973, Alaska-Aleutian Range batholith: Geochronology, chemistry, and relation to circum-Pacific plutonism: Geological Society of America Bulletin, v. 84, no. 8, p. 2583-2609.
Reporters D.P. Bickerstaff (USGS)
Last report date 6/15/1998