|Quadrangle map, 1:250,000-scale||SP|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The site represents two occurrences in a northeast-trending, two-mile-long area, about 2.5 miles northwest of the Takakula River. The approximate center of the area is in the NW1/4 of sec. 33, T. 23 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000 ft. The site corresponds to localities 50 and 51 of Grybeck and Nelson (1981).|
Geologic descriptionBoth occurrences are in or adjacent to Devonian granite near the contact with Paleozoic rocks (Nelson and Grybeck, 1980). The occurrences consist of a grab sample of black phyllite about 100 m from altered granite and several samples of marble, calc-silicate rocks, and gneissic granite. Selected samples contain 200 ppm Be, 30 and 50 ppm Bi, 20 ppm Mo, 100 and 5000 ppm Sn, and 700 ppm Zn. The occurrences are similar to other skarn deposits in the Brooks Range (Newberry and others, 1986).
|Geologic map unit||(-153.992802943194, 67.3595062611795)|
|Mineral deposit model||Skarn (Cox and Singer, 1986; model 14b)|
|Mineral deposit model number||14b|
|Age of mineralization||Devonian; related to the intrusion of Devonian pluton.|
|Alteration of deposit||Contact metamorphic.|
|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.
Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000.
Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
|Reporters||S.W. Nelson (Anchorage, Alaska)|
|Last report date||9/21/1999|