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Unnamed (east of Seven Sisters)

Prospect, Probably inactive

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Commodities and mineralogy

Main commodities Fe
Other commodities Ti
Ore minerals magnetite

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale B-4
Latitude 59.4164
Longitude -154.2031
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 2,200 feet, about 1.25 miles east-southeast of the summit of Seven Sisters. It is in the NE1/4NW1/4 sec. 8, T. 9 S., R. 29 W., Seward Meridian. The site, which is locality 30 of MacKevett and Holloway (1977), is accurate within about 1 mile.

Geologic setting

Geologic description

This prospect appears to be in a batholith of Jurassic, medium- to coarse-grained quartz diorite, east of an outcrop area of Tertiary basalt and andesite on the Seven Sisters (Detterman and Reed, 1980). The batholith locally contains diorite and granodiorite phases, and includes roof pendants of metamorphic rocks.
Lode claims, probably for iron, were staked at this site (U.S. Bureau of Mines, 1973; MacKevett and Holloway, 1977). The deposit probably consists of disseminations and veinlets of magnetite in relatively mafic phases of the batholith.
Geologic map unit (-154.205238477375, 59.4157227639308)
Age of mineralization Probably Jurassic.

Production and reserves

Workings or exploration Claims were staked at this site during or before 1973 (U.S. Bureau of Mines, 1973). There is no record of any workings.
Indication of production None

References

References

Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-B, 86 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
U.S. Bureau of Mines, 1973, Iliamna, Alaska quadrangle maps showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, scale 1:250,000.
Reporters C.C. Hawley, Hawley Resource Group, Anchorage, Alaska
Last report date 6/9/2003