Unnamed Occurrence (ARDF - MG014; west side of Selatna Hills), McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: A ferrigenous gossan occurs in a prominent north-south trending, high-angle fault zone on the west side of the Selatna Hills in the southwest McGrath quadrangle. The zone can be traced for about 950 meters along strike and is locally up to 60 meters wide, based on the appearance of ferrigenous seeps and rubble. The high-angle fault juxtaposes siltstone of the Late Cretaceous Kuskokwim Group flysch against axinite-bearing hornfels related to the early Cretaceous (61.0 Ma) Selatna pluton (Solie and others, 1991; Wilson and others, 1998). Three soil samples (78BT327-329) taken along a 150 meter-long line immediately south of the creek average 1.9 ppm silver, 169 ppm copper, 130 ppm lead, and 246 ppm zinc.
Workings: Four soil samples taken in 1978 along a 500 foot long line immediately south of the creek average 1.9 ppm silver, 169 ppm copper, 130 ppm lead, and 246 ppm zinc (T.K. Bundtzen, unpublished data).
Alteration: Gossan.
Reserves: None.
Commodities (Major) - Ag, Cu, Pb; (Minor) - Zn
Development Status: No
Deposit Model: Polymetallic vein(?) (Cox and Singer, 1986; model 22c).
Mineral List
1 entry listed.
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References
Solie, D.N., Bundtzen, T.K., and Gilbert, W.G., 1991, K/Ar ages of igneous rocks in the McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 91-23, 7 p., 1 sheet, 1:250,000 scale. Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 76 p., 3 sheets, scale 1:500,000.
