Pass Prospect, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi

Regional Level Types
Pass Prospect	Prospect
Bristol Bay Mining District	Mining District
Lake and Peninsula Borough	Borough
Alaska	State
USA	Country

No ore grade mineralization has been discovered (Nelson and others, 1985). Site is in Lake Clark National Park and Preserve.
Location: About 10.8 km NW of Kijik Lake. Locality 16 of Nelson and others (1985) and locality 24 of MacKevett and Holloway (1977). Sec. 3, T. 3 N., R. 30 W., of the Seward Meridian. Locality is accurate to within 2.0 km.
Geology: Iron-staining reported to be related to stockwork-fracture filling of pyrite and (or) pyrrhotite and varying amounts of chalcopyrite, galena, and tetrahedrite (?). Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3,000 ppm Cu, 1,500 ppm Pb, and 3,600 ppm Zn. Mineralization is associated with a silicified, brecciated zone in propylitically altered dacite porphyry, possibly an explosive vent breccia, part of unit Tv (Nelson and others, 1983). Unit Tv includes rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for Unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Workings: Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3000 ppm Cu, 1500 ppm Pb, and 3600 ppm Zn. Eakins and others (1978) reported a Mo anomaly of 66 ppm.
Age: Tertiary; potassium-argon ages for rocks of Unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
Alteration: Iron-staining, silicification, and propylization of the dacite.
Production: No production
Reserves: No reserves

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

Other Databases

Link to USGS - Alaska:	LC029

Other Regions, Features and Areas containing this locality

References