Twin Creek (ARDF #LG077) Au

Twin Creek

Mine, Inactive

Commodities and mineralogy

Main commodities	Au
Other commodities	Sn
Ore minerals	cassiterite; gold

Geographic location

Quadrangle map, 1:250,000-scale	LG
Quadrangle map, 1:63,360-scale	A-1
Latitude	65.031
Longitude	-147.467
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	Cobb (1972, MF-413), loc. 89; SW1/4NW1/4 sec. 1, T. 2 N., R. 1 E., of the Fairbanks Meridian. This placer mine is located near the confluence of Twin Creek and Skoogy Gulch.

Geologic setting

Geologic description Pay gravel is shallow, from 8 to 12 feet deep, over quartzite schist and porphyritic granite bedrock (Prindle, 1904; Prindle and Katz, 1909). Cassiterite is common in concentrates (Prindle and Katz, 1909). This placer was mined sporadically from 1903 to 1927 (Cobb, 1976; OFR 76-633). Production from 1903 to 1910 was valued at $120,000 with gold worth $17.66 per ounce (Prindle and Katz, 1913).
Geologic map unit	(-147.469443898434, 65.0305760182189)
Mineral deposit model	Placer gold deposit (Cox and Singer, 1986; model 39a).
Mineral deposit model number	39a

Production and reserves

Workings or exploration	Mined sporadically from 1903 to 1927 (Cobb, 1976; OFR 76-633). Mining was also reported in 1992 (Swainbank and others 1993).
Indication of production	Yes; small
Production notes	Production from 1903 to 1910 was worth $120,000 with gold valued at $17.66 per ounce (Prindle and Katz, 1913).

References

MRDS Number	A015509
References Brooks, A.H., 1905, Placer mining in Alaska in 1904: U.S. Geological Survey Bulletin 259, p. 18-31. Brooks, A.H., 1916, Mineral resources of Alaska, report on progress of investigations in 1915: U.S. Geological Survey Bulletin 642, 279 p. Chapin, Theodore, 1914, Lode mining near Fairbanks, Alaska: U.S. Geological Survey Bulletin 592-J, p. 321-355. Cobb, E.H., 1972, Metallic mineral resources map of the Livengood quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-413, 2 sheets, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-819, 241 p. Eakin, H.M., 1915, Mining in the Fairbanks district: U.S. Geological Survey Bulletin 622-G, p. 229-238. Ellsworth, C.E., and Davenport, R.W., 1913, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 542-F, p. 203-222. Joesting, H.R., 1942, Strategic mineral occurrences in interior Alaska: Alaska Territorial Department of Mines Pamphlet 1, 50 p. Johnson, B.L., 1910, Occurrence of wolframite and cassiterite in the gold placers of Deadwood Creek, Birch Creek district: U.S. Geological Survey Bulletin 442-F, p. 246-250. Prindle, L.M., 1904, Gold placers of the Fairbanks district, Alaska, in Emmons, S.F., and Hayes, C.W., Contributions to economic geology, 1903: U.S. Geological Survey Bulletin 225, p. 64-73. Prindle, L.M., 1905, The gold placers of the Fortymile, Birch Creek, and Fairbanks regions, Alaska: U.S. Geological Survey Bulletin 251, 89 p. Prindle, L.M., and Katz, F.J., 1909, The Fairbanks gold-placer region: U.S. Geological Survey Bulletin 379-E, p. 181-200. Prindle, L.M., and Katz, F.J., 1913, Detailed description of the Fairbanks district, in Prindle, L.M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 59-152. Purington, C.W., 1905, Methods and costs of gravel and placer mining in Alaska: U.S. Geological Survey Bulletin 263, 273 p. Smith, P.S., 1930, Mineral industry of Alaska in 1927 and Administrative Report: U.S. Geological Survey Bulletin 810-A, p. 1-64. Swainbank, R.C., Bundtzen, T.K., Clough, A.H., Hansen, E.W., and Nelson, M.G., 1993, Alaska's Mineral Industry 1992: Alaska Division of Geological and Geophysical Surveys Special Report 47, 80 p.
Reporters	C.J. Freeman, J.R. Guidetti Schaefer (Avalon Development Corporation)
Last report date	5/4/1999