Tak II Occurrences, Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi

Regional Level Types
Tak II Occurrences	Group of Occurrences
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: About 5.6 km south of the western end of Kontrashibuna Lake, near the headwaters of Takoka Creek on peak 4,367. This is locality 10 of MacKevett and Holloway (1977). Sec. 33, T. 1 N., R. 28 W., of the Seward Meridian. Location accurate within 1.6 km.
Geology: Occurrence identified by 58 lode iron claims (U.S. Bureau of Mines, 1973). MacKevett and Holloway (1977) reported that the occurrence may be in mineralized zones of contact-metamorphosed Upper Triassic limestone and dolomite that has been intruded by Tertiary, medium- to fine-grained hornblende-biotite quartz monzodiorite (Nelson and others, 1983; unit Ti2). The pluton yields concordant potassium-argon ages for hornblende and biotite of about 61 m.y. (Reed and Lanphere, 1972; 1973). Other nearby rocks include Tertiary volcanic rocks, which include rhyolitic breccia, ash-flow tuff, flows, felsic intrusive rocks, and subordinate mafic to intermediate flows (Nelson and others, 1983; unit Tv). Potassium-argon ages for Unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
Workings: Unknown
Age: Mineralization is Tertiary or younger. The quartz monzodiorite which is probably the source of the skarn yields concordant potassium-argon ages for hornblende and biotite of about 61 m.y. (Reed and Lanphere, 1972; 1973). Potassium-argon ages for the volcanic rocks range from 56.2 to 62.7 m.y. (Eakins and others, 1978).
Alteration: Unknown
Production: No production
Reserves: No reserves

Commodities (Major) - Cu, Fe
Development Status: None
Deposit Model: Fe skarn ? or Cu skarn ? (Cox and Singer, 1986; model 18d ? or 18b ?)

Other Databases

Link to USGS - Alaska:	LC049

Other Regions, Features and Areas containing this locality

References