Kijik Lake; Thompson Occurrence, Bristol Bay District, Lake and Peninsula Borough, Alaska, USA

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Overall, anomaly is weak. This may also be locality 2 of Mackevett and Holloway (1977) which corresponds with the Thompson prospects, 2 and 3, of Cobb (1972). Site is in Lake Clark National Park and Preserve.
Location: Nearly 5.0 km N-NW of Kijik Lake. Locality 17 of Nelson and others (1985) and locality 25 of MacKevett and Holloway (1977). Sec. 18, T. 3 N., R. 29 W., of the Seward Meridian. Locality accurate within 1.6 km.
Geology: The anomaly occurs in a structural zone where biotitic, chloritic, and strong silicic alterated dacite porphyry and breccia have been mineralized by 1 percent to 3 percent pyrite and traces of chalcopyrite (?) (Nelson and others, 1983; unit Tv). Mineralization spreads out along a NW-SE fault; possible breccia pipe or intrusive plug localized by the NW-SE fault. Analysis of rock sample yielded 5.8 ppm Ag, 180 ppm Cu, and 275 ppm Zn. Potassium-argon ages for this unit (Tv) range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Workings: Analysis of rock sample yielded 5.8 ppm Ag, 180 ppm Cu, and 275 ppm Zn.
Age: Tertiary or younger; potassium-argon ages for the volcanic rocks range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
Alteration: Biotite, chloritic, and strong silicic alteration of the dacite.
Production: No production
Reserves: No reserves

Commodities (Major) - Cu; (Minor) - Ag, Zn
Development Status: None
Deposit Model: Porphyry Cu ? (Cox and Singer, 1986; model 17 ?)

References

Cobb, E.H., 1972, Metallic mineral resources map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-378, 1 sheet, scale 1:250,000. 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.

Mineral List

Chalcopyrite

Pyrite

2 entries listed. 2 valid minerals.