|Quadrangle map, 1:250,000-scale||HU|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer prospect (mine?) is located on the Alatna River about 2 miles downstream from the mouth of Helpmejack Creek. The location is accurate within 1 mile.|
Geologic descriptionThere was placer activity in the area for several years in the 1920s and 1930s, but no indication of its extent. Recent samples collected here contain small amounts of fine- to very fine-grained gold particles (Kurtak and others, 2002). This occurrence is probably similar to other bar deposits on the Koyukuk River. Although no bedrock occurs here, the rocks in the adjacent hills are Cretaceous graywacke, mudstone, and conglomerate, and Upper Jurassic mafic-volcanic rocks (Patton and Miller, 1966). No other information is available.
|Geologic map unit||(-153.49780261159, 66.9302067115838)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Prospecting and possibly a small amount of mining. There was placer activity in the area for several years in the 1920s and 1930s, but no indication of its extent.|
|Indication of production||Undetermined|
Bottge, R.G., 1988, Maps summarizing land availability for mineral exploration and development in western Alaska, 1986: U.S. Bureau of Mines Open-File Report 14-88, 38 quadrangle overlays.
Degenhart, C.E., Griffis, R.J., McQuat, J.F., and Bigelow, C.G., 1978, Mineral studies of the western Brooks Range performed under contract to the U.S. Bureau of Mines, Contract #JO155089: U.S. Bureau of Mines Open-File Report 103-78, 529 p., 11 sheets.
Heiner, L.E., and Wolff, E.N., eds., 1968, Mineral resources of northern Alaska, Final report, submitted to the NORTH Commission: University of Alaska, Mineral Industry Research Laboratory Report No. 16, 306 p.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska: Final Report: U.S. Bureau of Land Management Technical Report 50, v. 1 and 2, 845 p.
Mendenhall, W.C., 1902, Reconnaissance from Fort Hamlin to Kotzebue Sound, Alaska, by way of Dall, Kanuti, Allen, and Kowak Rivers: U.S. Geological Survey Professional Paper 10, 68 p.
Patton, W.W., Jr., and Miller, T.P., 1966, Regional geologic map of the Hughes quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-459, 1 sheet, scale 1:250,000.
Smith, P.S., 1930, Mineral Industry of Alaska in 1928: U.S. Geological Survey Bulletin 813-A, p. 1-72.
Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113.
Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.
Smith, P.S., and Mertie, J.B., Jr., 1930, Geology and mineral resources of northwestern Alaska: U.S. Geological Survey Bulletin 815, 315 p.
U.S. Bureau of Mines, 1979, Mineral deposits of the Alatna, John, Killik and Kobuk River area and the North Fork of the Koyukuk River, Brooks Range, Alaska--A summary report: U.S. Bureau of Mines Open-File Report 36-79, 23 p., 1 sheet.
|Reporters||J.M. Britton (Anchorage)|
|Last report date||8/1/2002|