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Otter Lake

Occurrence, Inactive

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Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale B-3
Latitude 60.48
Longitude -153.79
Nearby scientific data Find additional scientific data near this location
Location and accuracy Locality is on the slope about 650 m NW of Otter Lake. This is locality 14 of Nelson and others (1985) and locality 22 of MacKevett and Holloway (1977). Sec. 35, T. 5 N., R. 26 W., of the Seward Meridian. Locality is accurate to within 1.6 km. Coordinates are for a point in the center of the occurrence. The occurrence is 2.6 km wide and extends 3.2km NE and SW from plotted location.

Geologic setting

Geologic description

West of Otter Lake, chlorite schists contain interbedded argillites, cherts, and recrystallized limestone. The schist contains disseminated chalcopyrite in massive pyrite. Within the Lake Clark schist belt. MacKevett and Holloway (1977) describe the rocks as Paleozoic (?) schists, largely of volcanic derivation; inlcudes both mafic and felsic volcanic schist. Felsic meta-volcanic rocks northeast of Portage Lake (located NW of Otter Lake) are considered to be a favorable host for network type copper-zinc deposit (Resource Associates of Alaska, 1976). Limestone beds are common hosts for mineralization.
Geologic map unit (-153.792237222262, 60.4793420544892)
Mineral deposit model Kuroko massive sulfide? (Cox and Singer, 1986; model 28a?).
Mineral deposit model number 28a?
Age of mineralization Host is Paleozoic ?
Alteration of deposit Unknown

Production and reserves

Workings or exploration Unknown
Indication of production None
Reserve estimates No reserves
Production notes No production

Additional comments

Site is in Lake Clark National Park and Preserve.

References

MRDS Number A013027

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., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
Reporters M.L. Miller (USGS); D.P. Bickerstaff (USGS)
Last report date 6/15/1998