|Quadrangle map, 1:250,000-scale||BN|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The original reference for this occurrence (West, 1953) describes it as on Grouse Creek whch is the same as Boulder Creek (BN089) on the current USGS topographic map of the area (Bendeleben A-1 quadrangle). The current topographic map shows Grouse Creek to be the northeast tributary to Boulder Creek and it was this location that was identified as locality 57 by Cobb (1972; MF 417; 1975; OFR 75-429). This prospect is here taken to be on Boulder Creek as shown on the current topographic map of the area. Boulder Creek is a small north tributary to the middle Tubutulik River.|
Geologic descriptionWest (1953) noticed the remains of old placer mine workings on this creek, as well as coal-bearing rocks in its headwaters, and collected a slightly radioactive heavy-mineral concentrate containing ilmenite, magnetite, garnet, and sphene. The Death Valley sandstone uranium deposit (BN089) is now known to be in the headwaters of this stream (Dickinson and others, 1987). The upper part of Boulder Creek approximately coincides with the contact between the Cretaceous Darby pluton to the west and early Eocene continental sediments and basalt to the east.
|Geologic map unit||(-162.222609939142, 65.0292996086041)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary|
|Workings or exploration||Surface placer mine workings have been noted here (West, 1948) but their success in recovering gold is uncertain.|
|Indication of production||Undetermined|
Cobb, E.H., 1972, Metallic mineral resources map of the Bendeleben quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-417, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Bendeleben quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-429, 123 p.
Dickinson, K.A., Cunningham, K.D., and Ager, T.A, 1987, Geology and origin of the Death Valley uranium deposit, Seward Peninsula, Alaska: Economic Geology, v. 82, p. 1558-1574.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||3/15/1999|