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Alfred Creek; Alaska Gold Mining. Co.; Caribou Creek Mine, Willow Creek District, Matanuska-Susitna Borough, Alaska, USA

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Latitude & Longitude (WGS84): 61° 57' 0'' North , 147° 28' 47'' West
Latitude & Longitude (decimal): 61.95000,-147.47972
Köppen climate type:ET : Tundra


Exact locations of placer mines are unknown.
Location: Location given is arbitrary point on Alfred Creek (between Pass Creek and Bench Creek, both tributaries of Alfred Creek, because exact location of placers unknown. Accurate within 2 miles. Locality 88 of Cobb (1972) and locality 61 of MacKevett and Holloway (1977).
Geology: Placer gold found along length of stream. Lower part of the stream course cuts through Cretaceous shale, while upstream it cuts through Jurassic sandstone and shale. The Jurassic sandstone and shale is cut by small dikes. Ridge north of creek capped by Tertiary volcanic rocks that may be underlain by conglomerate, which could be source of placer gold in the creek (Martin and Mertie, 1914).
Workings: Small scale placers worked sporadically for many years. Total production said to be about 70-75 fine ounces of gold. Minor amounts of platinum are found with gold.
Age: Quaternary
Production: Total production said to be about 70-75 fine ounces of gold.

Commodities (Major) - Au; (Minor) - Pt
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)

Mineral List


2 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 1746650
Unconsolidated surficial deposits, undivided

Age: Pleistocene (0 - 2.588 Ma)

Description: Widespread glacial, alluvial, colluvial, and lacustrine deposits, rock glaciers, and landslides; have not been subdivided. Glacial deposits include extensive ground, lateral and terminal moraines, and associated outwash deposited during several advances and retreats. Drift mantling Anchorage lowland almost entirely Pleistocene in age. Other surficial deposits probably Holocene age.

Lithology: Unconsolidated

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Cretaceous
66 - 145 Ma



ID: 633995
Sedimentary; Sedimentary: undivided

Age: Cretaceous (66 - 145 Ma)

Description: Okhotsk, Bering Sea, Pacific Alaska, Alaska Range

Comments: Orogen, magmatic arc/suite; Wilson & Hults, unpublished compilation, 2007-08

Lithology: Sandstone, siltstone, shale, limestone or metamorphosed equivalent

Reference: J.C. Harrison, M.R. St-Onge, O.V. Petrov, S.I. Strelnikov, B.G. Lopatin, F.H. Wilson, S. Tella, D. Paul, T. Lynds, S.P. Shokalsky, C.K. Hults, S. Bergman, H.F. Jepsen, and A. Solli. Geological map of the Arctic. doi:10.4095/287868. Geological Survey of Canada Map 2159A. [2]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Brooks, A.H., 1913, Mineral resources of Alaska, report on progress of investigations in 1912: U.S. Geological Survey Bulletin 542, 308 p. Brooks, A.H., 1925, Alaska's mineral resources and production, 1923: U.S. Geological Survey Bulletin 773-A, p. 3-52. Brooks, A.H., and Capps, S.R., 1924, The Alaska mining industry in 1922: U.S. Geological Survey Bulletin 755-A, p. 1-56. Chapin, Theodore, 1918, The Nelchina-Susitna region, Alaska: U.S. Geological Survey Bulletin 668, 67 p. Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000. Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p. Jasper, M.W., 1965, Geochemical investigations of selected areas in south-central Alaska, 1964: Alaska Division of Mines and Minerals Geochemical Report 4, 31 p. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Martin G.C., and Mertie, J.B., 1914, Mineral resources of the upper Matanuska and Nelchina valleys, Alaska: U.S. Geological Survey Bulletin 592-H, p. 273-299.

 
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