Alfred Creek; Alaska Gold Mining. Co.; Caribou Creek Mine, Willow Creek District, Matanuska-Susitna Borough, Alaska, USA
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.
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)
ReferencesBrooks, 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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2 entries listed. 2 valid minerals.
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Locality Updated: Portland Harbour Trust Quarry, Cape Sir William Grant, Portland, Victoria, AustraliaFrom Peter Hall, 29th Jul 2014 22:43:03