|Quadrangle map, 1:250,000-scale||HU|
|Quadrangle map, 1:63,360-scale||D-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This placer occurrence is located on Helpmejack Creek but its exact location is not known. The site is arbitrarily plotted 2.2 miles north of the northernmost of the Helpmejack Lakes in the SE1/4 section 35, T. 19 N., R 24 E. of the Kateel River Meridian.|
Geologic descriptionMendenhall (1902) reports that colors of gold had been found on Helpmejack Creek, but that none of the prospects were rich enough to justify much time or money. In this area, the creek cuts across mafic volcanic rocks and phyllite that range in age from Devonian(?) to Cretaceous or Jurassic(?) (Patton and Miller, 1966). A recent, panned-concentrate sample from the creek contains 54 ppb Au, but no visible gold (Kurtak and others, 1999). No other information is available.
|Geologic map unit||(-153.536014862033, 66.9980075093218)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Prospecting, including sinking of shafts.|
|Indication of production||None|
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.
Cobb, E.H., 1972, Metallic mineral resources map of the Hughes quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-458, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in five quadrangles in west central Alaska (Hughes, Kotzebue, Melozitna, Selawik, Shungnak): U.S. Geological Survey Open-File Report 75-627, 58 p.
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 Williams, E.M., 1999, Mineral investigations in the Koyukuk mining district, northern Alaska--Progress Report: U.S. Bureau of Land Management Open-File Report 74, 158 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.
Wyman, J.N., 1988, Journey to the Koyukuk: The photos of J.N. Wyman, 1898-1899: Missoula, Mont., Pictorial Histories Publishing Co., 128 p.
|Reporters||J.M. Britton (Anchorage)|
|Last report date||8/1/2002|