|Quadrangle map, 1:250,000-scale||SP|
|Quadrangle map, 1:63,360-scale||B-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site comprises three occurrences (locations 14, 15, and 16) in Grybeck and Nelson, 1981. The center of the area of occurrences is in sec. 34, T. 24 N., R. 17 E., of the Kateel River Meridian. The area of occurrences covers approximately 9 square miles of the prominent mountain (peak 6711) whose summit is east of Angiaak Pass. Site location is accurate to within 0.5 mi.|
Porphyritic, foliated granite of Devonian age is irregularly stained a gaudy orange-yellow over an area of about 9 square miles. The staining is related to alteration of the mafic minerals in the granite to coarse white mica and oxidation of pervasive disseminated pyrite. Grab samples rarely give anomalous metal values but extended search almost anywhere can usually locate a few grains of molybdenite, fluorite, or arsenopyrite along fractures in the altered granite.At one outcrop near the top of peak 6711 in the center of the area, a one-inch-thick quartz vein in a small roof pendant of calc-silicate rocks that overlie the granite contains visible galena and 7 ppm Ag. Area only briefly examined at a few scattered places and it is likely that other such occurrences can be found in this roof pendant.
|Geologic map unit||(-155.0627692638, 67.4394939054217)|
|Mineral deposit model||Porphyry Mo or porphyry Cu (Cox and Singer, 1986; models 16 or 17)|
|Mineral deposit model number||16? or 17?|
|Age of mineralization||Devonian, based on the age of the pluton (Nelson and Grybeck, 1980).|
|Alteration of deposit||White mica and pyrite oxidation.|
|Indication of production||None|
Additional commentsLocated within Gates of the Arctic National Park.
Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.
|Reporters||S.W. Nelson (Anchorage, Alaska)|
|Last report date||9/17/1999|