|Quadrangle map, 1:250,000-scale||SO|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Cache Creek is labeled Spruce Creek on older maps. Its mouth is on Taylor Lagoon adjacent to Norton Sound, 8.3 miles east of Solomon. This is locality 105 (Spruce Creek) of Cobb (1972, MF 445; 1978, OF 78-181).|
Geologic descriptionAbout 8,000 feet of placer workings have been mapped along this drainage between elevations of about 45 and 130 feet. The workings start about 5,000 feet upstream from the mouth of the creek on Taylor Lagoon. Although prospected in the 1900s (Collier and others, 1908), principal mining was by dredging in the 1930s (Cobb, 1978). Some gravels were locally-derived schist and greenstone that was coarse and not well-rounded (Smith, 1910). The gravels were about 11 feet thick on bedrock and permafrost was locally encountered (Smith, 1933). Some beach gravel was encountered and mined but the location was not reported. The pay streak was reported to have been mined out (Smith, 1939). The elevation and location of this placer indicates that it was influenced by Quaternary sea level fluctuations. Bedrock in the area is part of a pelitic schist assemblage of possible Cambrian or Precambrian age (Till and others, 1986).
|Geologic map unit||(-164.151609777682, 64.5902588895608)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||About 8,000 feet of placer workings have mapped along this drainage between elevations of about 45 and 130 feet. The workings start about 5,000 feet upstream from the mouth of the creek on Taylor Lagoon. Although prospected in the 1900s (Collier and others, 1908), principal mining was by dredging in the 1930s (Cobb, 1978).|
|Indication of production||Yes; medium|
|Production notes||The dredge operating on this creek was apparently the major producer in the area between 1932 and 1935; considering the extent of the workings the deposits may have been high grade. The paystreak was reported to have been mined out (Smith, 1939).|
Cobb, E.H., 1972, Metallic mineral resources map of the Solomon quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-445, 1 sheet, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Solomon quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-181, 185 p.
Collier, A.J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.
Smith, P.S., 1910, Geology and mineral resources of the Solomon and Casadepaga quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Bulletin 433, 234 p.
Smith, P.S., 1933, Mineral industry of Alaska in 1930: U.S. Geological Survey Bulletin 836-A, p. 1-83.
Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||8/19/1999|