|Quadrangle map, 1:250,000-scale||FB|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Hill Creek mine is located in sec. 30, T. 2 N., R. 2 E., Fairbanks Meridian. The location given is the approximate center of placer workings that extend from about 1,000 feet to 2,500 feet upstream from the junction of Hill Creek and Gilmore Creek. The mine is locality 56 of Cobb (1972 [MF 410]).|
Geologic descriptionThis placer deposit is developed on weathered, coarse-grained, porphyritic biotite granite (Brooks, 1925, p. 19; Prindle, 1908, p. 40). Gold is derived from a mineralized zone near a contact between Cretaceous granite and schist (Brooks, 1911 [B 480, p. 69]). The pay streak was said to be narrow (Prindle, 1908, p. 40). The alluvium consists of granitic sand about 8 feet deep (Prindle, 1908, p. 40). The gold varies from from 750 to 934 fine (Glover, 1950).
|Geologic map unit||(-147.432437512451, 64.9725757089286)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary placer.|
|Alteration of deposit||The bedrock of biotite granite is deeply weathered and stained with iron (Prindle, 1908, p. 40).|
|Workings or exploration||Open-cut mining took place in the valley floor sometime before 1908 (Prindle, 1908, p. 40). Evidence for more recent mining is the placer tailings and a mine marked on the Fairbanks (D-1) NW topographic map on Hill Creek ,but no other information is available.|
|Indication of production||Yes; small|
|Production notes||There probably was some minor production before 1908, and relatively modern tailings along the creek indicate some production in recent years.|
Brooks, A.H., 1911, The mining industry in 1910, in Brooks, A.K., and others, Mineral resources of Alaska, report on progress of investigations in 1910: U.S. Geological Survey Bulletin 480-B p. 21-43.
Brooks, A.H., 1925, Alaska's mineral resources and production, 1923: U.S. Geological Survey Bulletin 773-A, p. 3-52.
Cobb, E.H., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p.
Glover, A.E., 1950, Placer gold fineness: Alaska Territorial Department of Mines Miscellaneous Report 195-1, 38 p.
|Reporters||J.R. Guidetti Schaefer and C.J. Freeman (Avalon Development Corporation)|
|Last report date||7/31/2001|