|Quadrangle map, 1:250,000-scale||CA|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 800 feet near the headwaters of Quartz Creek. The site is in section 25, T. 1 N., R. 13 W., of the Kateel River Meridian. Cobb, 1972 (MF-389), location 10, and Miller and Elliott (1969), figure 2, sample locations 24, 25, and 26.|
Geologic descriptionThis occurrence is located adjacent to the mid-Cretaceous Quartz Creek pluton, a hook-shaped, quartz monzonite body. The pluton is surrounded by a N 15 W-trending alteration zone about 18 miles long and 2 to 5 miles wide. The alteration zone is in Jurassic-Cretaceous andesitic volcanic rocks, and is marked by carbonate-quartz replacement, and tourmaline. Fine-grained dikes of varying composition cut the andesites near the pluton. Dikes near the Quartz Creek pluton are locally mineralized. This occurrence consists of a galena-bearing calcite vein 18 inches thick in altered quartz monzonite. The altered quartz monzonite consists of quartz-carbonate-sericite rock containing disseminated pyrite, arsenopyrite, galena, sphalerite, and tourmaline. A composite grab sample contained 44 ppm Ag, 2.25% Pb, and 4.67% Zn (Miller and Elliott, 1969).
|Geologic map unit||(-161.392644575771, 65.4893257855244)|
|Mineral deposit model||Sulfides in altered quartz monzonite.|
|Age of mineralization||Late Cretaceous.|
|Alteration of deposit||Tourmaline and sericite alteration along closely spaced fractures; quartz-carbonate replacement.|
|Workings or exploration||The area has been mapped and examined by the U.S. Geological Survey and by various exploration companies.|
|Indication of production||None|
Additional commentsThis 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.
Cobb, 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., 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.
|Reporters||Anita Williams (Anchorage, AK)|
|Last report date||1/12/2000|