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

Regional Level Types
Kijik River; Thompson Prospect	Prospect
Bristol Bay Mining District	Mining District
Lake and Peninsula Borough	Borough
Alaska	State
USA	Country

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)

Other Databases

Link to USGS - Alaska:	LC034

Other Regions, Features and Areas containing this locality

References