Latitude: 59°14'20"N
Longitude: 154°42'21"W
Location: This approximately located occurrence is at an elevation of about 2,250 feet approximately 1.5 miles northeast of the east end of Mirror Lake. It is near the center of sec. 8, T. 11 S., R. 32 W., Seward Meridian. The location is uncertain; it is based on a description by Mather (1925, p. 172), which correlates fairly well with the geology mapped by Detterman and Reed (1980). The lccation is probably accurate within about 1 mile. Mather (1925) also noted mineral deposits closer to the east end of Mirror Lake.
Geology: The country rocks at this site are mainly Tertiary volcanic strata that rest unconformably on Jurassic granodiorite that underlies much of the headwater area of Funnel Creek above Mirror Lake (Detterman and Reed, 1980). The granodiorite has a lobe-like western projection into the head of Mirror Lake. Mather (1925) believed that the granodiorite intrudes the Tertiary volcanic rocks, but it probably intrudes only nearby Jurassic or older rocks (Detterman and Reed, 1980). The volcanic rocks at this occurrence reportedly are cut by abundant quartz-pyrite veins as much as several inches thick (Mather, 1925). Nearer Mirror Lake, and exposed in small creeks flowing into the lake, a swarm of pyrite- and chalcopyrite-bearing quartz veins as much as a half-mile across is in the Jurassic granodiorite and its metamorphic country rocks (Mather, 1925).
Workings: No claims or workings are reported.
Age: The veins in the volcanic rocks are Tertiary; the veins in the granodiorite and metasedimentary rocks are Jurassic or younger.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Uncertain. Possibly polymetallic veins or porphyry copper (Cox and Singer, 198
References
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p. 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. Mather, K.F., 1925, Mineral resources of the Kamishak Bay region: U.S. Geological Survey Bulletin 773, p. 159-181.
Mineral List
3 entries listed. 3 valid minerals.
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