Unnamed Occurrence (ARDF - CA032; on Quartz Creek), Fairhaven District, Northwest Arctic Borough, Alaska, USA
This site is one of numerous occurrences of argentiferous galena, sphalerite, pyrite and arsenopyrite in an 18-mile-long, 2- to 5-mile-wide zone of altered andesite surrounding the Quartz Creek quartz monzonite pluton. The altered zone trends N 15 W, across the drainage basins of Quartz Creek and the Kiwalik River, parallel to prominent lineaments in the area.
Location: This occurrence is at an elevation of about 400 feet on the north side of Quartz Creek, approximately 8 miles upstream from its junction with Kiwalik River. The map site is in the SE1/4 of section 11, T. 2 N., R. 14 W., of the Kateel River Meridian. Cobb, 1972 (MF-389), location 3 and Miller and Elliott (1969), figure 2, location 2 and 3.
Geology: The country rocks in the area of this occurrence include the Upper Cretaceous Quartz Creek pluton, and Jurassic-Cretaceous andesitic volcanic rocks that are cut by fine-grained dikes less than 30 feet thick. The dikes contain quartz and calcite veins carrying disseminated pyrite, arsenopyrite, argentiferous galena, and sphalerite. The veins occur near the contact with quartz monzonite of the Quartz Creek pluton. Analyses of grab samples by Miller and Elliot (1969) gave the following results: location 2A contained 70 ppm Cu and 700 ppm Pb; location 3B contained 20 ppm Ag, 300 ppm Cu, greater than 2% Pb, and greater than 1 % Zn. The mineral occurrences in the Quartz Creek area are generally anomalous in boron and tin.
Workings: The area has been mapped and examined by the U.S. Geological Survey and various exploration companies.
Age: Late Cretaceous.
Commodities (Major) - Ag, Pb, Zn; (Minor) - Au
Development Status: Undetermined
Deposit Model: Sulfides in quartz and calcite veins that cut andesite.
ReferencesCobb, E.H., 1972, Metallic mineral resources map of the Candle Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-389, 1 sheet, scale 1:250,000. Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Candle, Holy Cross, Norton Bay, Nulato, and Unalakleet quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-866, 102 p. Miller, T.P., and Elliott, R.L., 1969, Metalliferous deposits near Granite Mountain, eastern Seward Peninsula, Alaska: U.S. Geological Survey Circular 614, 19 p.
var: Argentiferous Galena
7 entries listed. 6 valid minerals.
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Locality Updated: Porterville Borrow pit, Tennessee Knob, Tulare Co., California, USAFrom Chester S. Lemanski, Jr., 11th Dec 2013 18:23:18