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

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Older descriptions are of questionable reliability. Locality 4 of Cobb (1972) probably the same as locality 3 of MacKevett and Holloway (1977), the Thompson claims. Site is in Lake Clark National Park and Preserve.
Location: Approximately 4.0 km NW of Kijik Mountain; on peak 3,440 - 1.9 km west of Kiljik River. Locality 18 of Nelson and others (1985), locality 26 of MacKevett and Holloway (1977), and the approximate location of locality 4 of Cobb (1972). Sec. 9, T. 3 N., R. 29 W., of the Seward Meridian. Locality accurate within 2.0 km.
Geology: Granodiorite stock and rhyolite (Nelson and others, 1983; unit Tv) cut by 0.64-2.54 cm thick N-S trending quartz-chalcopyrite and quartz-pyrite-arsenopyrite veins. Mineralization also disseminated in the rhyolite and granodiorite (Resource Associates of Alaska, 1976). Grab samples contain up to 0.25 percent Cu and 0.17 percent Mo (Nokleberg and others, 1997). Nokleberg and others (1997) describe the site as: a large area of dessiminated sulfides in, and adjacent to an early Tertiary dacite porphyry. Orange gossan covers over a 3 square kilometer area with extensive stockwork and zones of sericite and sulfides. The dacite porphyry has undergone extensive propylitic and silicic alteration. Potassium-argon ages for host rock range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978). Moxham and Nelson (1952) reported the 'Thompson silver-lead claims' occur near here and consist of arsenopyrite with a little galena (argentiferous?), chalcopyrite, sphalerite, and pyrite in a gangue of calcite and rhodochrosite. This mineralization was reported to occur in a 183 m wide shear zone in granitic rock (but authenticity unknown).
Workings: Samples taken by Resource Associates of Alaska (1976) were anomalous in copper and silver. Grab samples contain up to 0.25 percent Cu and 0.17 percent Mo (Nokleberg and others, 1997).
Age: Tertiary or younger; potassium-argon ages for the host rock range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Alteration: Extensive propylitic and silicic alteration of the dacite porphyry (Nokleberg and others, 1997).
Production: No production
Reserves: Estimated reserves of 91 million tonnes (Nokleberg and others, 1997).

Commodities (Major) - Cu; (Minor) - Ag, Mo, Pb, Zn
Development Status: None
Deposit Model: Porphyry Cu or Polymetallic vein (Cox and Singer, 1986; model 17 or 22c)

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. Brooks, A.H., 1914, Mineral resources of Alaska; report on progress of investigations in 1913: U.S. Geological Survey Bulletin 592, 413 p. 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., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 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. Eakins, G.R., 1970, Geology and geochemistry of Kontrashibuna Lake, Lake Clark region, southwestern Alaska: Alaska Division of Mines and Geology Geochemical Report 20, 34 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. Moxham, R.M., and Nelson, A.E., 1952, Reconnaissance for radioactive deposits in the southern Cook Inlet region, Alaska, 1949: U.S. Geological Survey Circular 207, 7 p., 1 plate, scale 1:500,000. 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. Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin, R.A., Goryachev, N.A., Koch, R.D., Ratkin, V.V, Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrochenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, D., Khanchuck, A.I., Kovbas, L.I., Nekrasov, I.Y., and Sidorov, A.A., 1996, Significant metalliferous and selected non-metalliferous lode mineral deposits and placer districts, and for metallogenesis of the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 385 p.; U.S. Geological Survey Open-File Report 96-513-B, 385 p. (CD-ROM format). 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. Smith, P.S., 1915, Mineral resources of the Lake Clark-Iditarod region: U.S. Geological Survey Bulletin 622-H, p. 247-271. Smith, P.S., 1917, The Lake Clark-central Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 655, 162 p. Smith, P.S., 1942, Occurrences of molybdenum in Alaska: U.S. Geological Survey Bulletin 926-C, p. 161-210. Wedow, Helmuth, Jr., 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 51, 123 p. Singer, D.A., Berger, V.I., and Moring, B.C. (2008): Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. US Geological Survey Open-File Report 2008-1155.

Mineral List

Arsenopyrite Calcite Chalcopyrite 'Chlorite Group'

Galena var: Argentiferous Galena Molybdenite Muscovite var: Sericite Pyrite

Pyrrhotite Quartz Rhodochrosite Sphalerite

Tetrahedrite

13 entries listed. 10 valid minerals.