East Gladiator Occurrence, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi

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

Site is in Lake Clark National Park and Preserve.
Location: Locality is at the top of a 1,829 m (6,000 ft) peak 4.8 km NE of the eastern end of Kontrashibuna Lake. The anomaly extends at least 1.6 km around the location. This is locality 34 of Nelson and others (1985) and locality 31 of MacKevett and Holloway (1977). Sec. 17, T. 1 N., R. 26 W., of the Seward Meridian. Accurate within 1,500 meters.
Geology: Widespread, mostly low-grade mineralization associated with metamorphic rocks (roof pendant) and volcanic rocks in vicinity of Tertiary granite. Chalcopyrite occurs as thin fracture coatings or within quartz veins in shear zones (Nelson and others, 1985). Sulfide mineralization best developed in the meta-siltstone and argillite near andesite or diorite contact. Maximum values from rock chip samples yielded: 27.7 ppm Ag, 0.32 percent Cu, 0.09 percent Pb, 75 ppm Sn, and 0.1 percent Zn (Nelson and others, 1985). Three close-spaced southwest flowing streams, about 3.2 km SW of this location is sample 'Area D' of Eakins (1970). These streams flow through basalt into the eastern end of Kontrashibuna Lake. Stream sediment samples reported by Eakins (1970) yielded up to 95 ppm Pb and 225 ppm Zn. Copper values were below 50 ppm. Nelson and others (1983, units Ti8 and Tv) describe the rocks in this area as Tertiary medium-grained biotite-hornblende granodiorite which also includes granite and quartz monzodiorite; and Tertiary volcanic rocks that include rhyolitic breccia, ash-flow tuff, flows, and felsic intrusive rocks, and subordinate mafic to intermediate flows.
Workings: Maximum values from rock chip samples yielded: 27.7 ppm Ag, 0.32 percent Cu, 0.09 percent Pb, 75 ppm Sn, and 0.1 percent Zn (Nelson and others, 1985). Stream sediment samples reported by Eakins (1970) yielded up to 95 ppm Pb and 225 ppm Zn. Copper values were below 50 ppm.
Age: Tertiary or younger
Alteration: Sericitic, argillic, and chloritic alteration.
Production: No production
Reserves: No reserves

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

Other Databases

Link to USGS - Alaska:	LC043

Other Regions, Features and Areas containing this locality

References