|Quadrangle map, 1:250,000-scale||CI|
|Quadrangle map, 1:63,360-scale||C-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The location is the site of a sample of a small quartz vein described in U.S.G.S. OFR 84-479, Plate 1, No. 2FR2036 (Foster and others, 1984). Porcupine Dome is located approximately 3 miles east of Pinnell Mountain.|
Geologic descriptionQuartz veins that cut metamorphic rocks carry Au, Ag and cassiterite (Cobb, 1976, p. 53, [OFR 76-633]). There are no known granitic rocks in the area. A sample of iron- stained quartzite containing a small quartz vein carrying arsenopyrite(?) had 3.0 ppm Au, 1.0 ppm Ag. Nearby samples are anomalous in tin (W.D. Menzie, USGS 1982-83 field notes; Foster and others, 1984).
|Geologic map unit||(-145.49846634634, 65.5346247532456)|
|Workings or exploration||Surface sampling only.|
|Indication of production||None|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Burand, W. M., 1968, Geochemical investigations of selected areas in the Yukon-Tanana region of Alaska, 1965 and 1966: Alaska Division of Mines and Minerals Geochemical Report 13, 51 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Circle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-391, 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 Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.
Foster, H.L., O'Leary, R.M, McDougal, C.M, and Menzie, W.D., 1984, Analyses of rock samples from the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 84-479, 126 p., 1 sheet, scale 1:250,000.
Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.
|Reporters||C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)|
|Last report date||9/9/1998|