Latitude: 55°10'33"N
Longitude: 132°40'48"W
Location: This occurrence is at an uncertain location west of Eek Lake. For this record, the coordinates are at about the middle of the west shore of Eek Lake in section 24, T. 77 S., R. 84 E. Alternatively, the occurrence may be on the west side of the large unnamed lake just to the south in section 25. It thus may be a mile or more from the coordinates.
Geology: While following up a geophysical anomaly in 1992, Alaska Copper and Nickel Company found what they originally thought was a stratiform pyrite-chalcopryite deposit on the west side of Eek Lake (Hedderly-Smith, 1999 [Inventory]). Samples across 1 meter of outcrop contained 5.2 to 10 percent copper, 251 to 269 parts per million (ppm) zinc, and 5.0 to 6.1 ppm silver. The company subsequently revisited the property and concluded that it was a vein, based on samples that contained up to 111 ppm molybdenum. There is no other information about the deposit. It may be on either side of a fault contact between greenstone, schist, and phyllite of the Wales Group of Late Proterozoic and Cambrian age and sedimentary rocks of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996).
Workings: Limited surface sampling by industry in 1992.
Commodities (Major) - Ag, Cu, Mo, Zn
Development Status: None
Deposit Model: Ambiguous.
References
Brew, D.A., 1996, Geologic map of the Craig, Dixon Entrance, and parts of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2319, 53 p., 1 sheet, scale 1:250,000. Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p. Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Mineral List
2 entries listed. 2 valid minerals.
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