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Knutson

Prospect, Inactive

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Alternative names

Knudsen

Commodities and mineralogy

Main commodities Au; Cu
Other commodities Ag
Ore minerals gold; unidentified copper-bearing minerals and silver-bearing minerals
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale D-4
Latitude 59.8346
Longitude -154.2809
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,300 feet on the west flank of Knutson Mountain about two miles north of Knutson Bay (Martin and Katz (1910, 1912). The site is in the NE1/4 sec. 17, T. 4 S., R. 29 W., Seward Meridian, and is probably accurate within 0.5 mile. The site is locality 3 of Detterman and Cobb (1972).

Geologic setting

Geologic description

This prospect consists of two quartz veins that cut quartz monzonite of Cretaceous age (Detterman and Reed, 1980). A 3- to 8-foot-thick quartz vein contains sparse and irregularly distributed gold, along with copper- and probably silver-bearing minerals. A similar but thinner vein was reported within about 0.25 mile, in an unknown direction, from the main vein (Martin and Katz, 1910,1912; Berg and Cobb, 1967).
The exact location of this deposit, and its production, grade, and nature of ore are unkown or uncertain. The prospect was sometimes described as a copper deposit (Brooks, 1913).
Geologic map unit (-154.283072311282, 59.8339299110509)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c?
Age of mineralization Cretaceous or younger.

Production and reserves

Workings or exploration A 40-foot tunnel was driven in 1912 (Brooks, 1913, p. 39).
Indication of production None

References

MRDS Number A013033

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Brooks, A.H., 1913, Mineral resources of Alaska, report on progress of investigations in 1912: U.S. Geological Survey Bulletin 542, 308 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 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.
Detterman, R.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Iliamna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-364, 1 sheet, scale 1:250,000.
Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-B, 86 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., and Katz, F.J., 1910, Outline of the geology and mineral resources of the Iliamna and Clark lakes region: U.S. Geological Survey Bulletin 442-E, p. 179-200.
Martin, G.C., and Katz, F.J., 1912, A geologic reconnaissance of the Iliamna region, Alaska: U.S. Geological Survey Bulletin 485, 138 p.
Wedow, Helmuth, White, M. G., and Moxham, R. M., 1952, Interim report on an appraisal of the uranium possibilities of Alaska: U.S. Geological Survey Open-File Report 52-165, 124 p.
Reporters C.C. Hawley, Hawley Resource Group, Anchorage, Alaska
Last report date 6/3/2003