West Ospook Occurrence, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi

Regional Level Types
West Ospook Occurrence	Occurrence
Bristol Bay Mining District	Mining District
Lake and Peninsula Borough	Borough
Alaska	State
USA	Country

Possibility for hydrothermal vein or replacement deposit in the andesite near the granodiorite or along strongly fractured fault zones. Site is in Lake Clark National Park and Preserve.
Location: Locality is approximately 2.4 km west of the mouth of Ospook Creek, along an unnamed northward flowing stream which drains into Kontrashibuna Lake. This is locality 35 of Nelson and others (1985) and locality 34 of MacKevett and Holloway (1977). Sec. 35, T. 1 N., R. 27 W., of the Seward Meridian. Location is accurate to about 1.6 km.
Geology: Occurrence is associated with sulfide mineralization near contact between Tertiary granodiorite and Tertiary andesite porphyry. Sulfide mineralization is disseminated but mineralization is strongest along fracture zones at the contact of the granodiorite and andesite. Undefined Mo and Pb sulfide minerals occur at this locality. Andesite locally contains 2 to 4 percent disseminated pyrite, magnetite, and trace chalcopyrite. In the vicinity of the site andesite porphyry, tuffs, agglomerates, and other intermediate volcanic rocks are intruded by small gabbro and granodiorite bodies. Soil and stream sediment samples yielded values of up to 1,800 ppm Cu, 183 ppm Mo, and 230 ppm Pb (Resource Associates of Alaska, 1976).
Workings: Soil and stream sediment samples yielded values of up to 1,800 ppm Cu, 183 ppm Mo, and 230 ppm Pb (Resource Associates of Alaska, 1976).
Age: Tertiary or younger.
Production: No production
Reserves: No reserves

Commodities (Major) - Cu; (Minor) - Mo, Pb
Development Status: None
Deposit Model: Porphyry Cu -Mo ? (Cox and Singer, 1986; model 21a ?)

Other Databases

Link to USGS - Alaska:	LC047

Other Regions, Features and Areas containing this locality

References