Unnamed Occurrence (ARDF - KC169), Hassler Lake, Annette Island, Ketchikan District, Prince of Wales-Outer Ketchikan Borough, Alaska, USA
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Geology: The country rock in the area of this site is Silurian trondhjemite that locally is sheared and sericitized, probably owing to Upper Cretaceous, greenschist-grade regional metamorphism (Berg, 1972 [I 684]). The occurrence consists of sparse base-metal sulfide mineralization in the trondhjemite, and is based on a sample of trondhjemite containing Cu-Pb-Zn sulfide minerals collected by a road construction crew in 1990 (Karl, 1992, loc. 17).
Alteration: Local sericitization of trondhjemite country rock.
Commodities (Major) - Cu, Pb; (Minor) - Zn
Development Status: None
Deposit Model: Disseminated sulfide minerals in trondhjemite.
Mineral List
3 entries listed. 3 valid minerals.
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References
Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360. Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.