Unnamed Occurrence (ARDF - VA075; near the head of the Uranatina River), Nelchina District, Valdez-Cordova Borough, Alaska, USA
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Geology: Stratiform, iron-stained zones extend for as much as several hundred meters in quartz-mica schist of the Haley Creek terrane (Winkler and others, 1981 [OFR 80-892-B]; Winkler and others, 1981 [OFR 80-892-A]). These zones contain disseminated pyrite, sphalerite, and galena (?). These may be epigenetic replacement deposits and younger than the enclosing schist (Winkler and others, 1981 [OFR 80-892-B]).
Workings: Surface examination and possibly sampling have taken place at this occurrence.
Age: Schist of the Haley Creek terrane was probably metamorphosed in the mid-Cretaceous (Winkler and others, 1981 [OFR 80-892-A]). If the deposits are epigenetic, they are probably Late Cretaceous or Tertiary.
Commodities (Major) - Ag, Pb, Zn
Development Status: None
Deposit Model: Disseminated replacement deposits (?) in quartz-mica schist
Mineral List
3 entries listed. 3 valid minerals.
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References
Winkler, G.R., Miller, R.J., MacKevett, E.M., Jr., and Holloway, C.D., 1981, Map and summary table describing mineral deposits in the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-B, 2 sheets, scale l:250,000. Winkler, G.R., Silberman, M.L., Grantz, Arthur, Miller, R.J., and MacKevett, E.M., Jr., 1981, Geologic map and summary geochronology of the Valdez quadrangle, southern Alaska: U.S. Geological Survey Open-File Report 80-892-A, 2 sheets, scale 1:250,000.