Alfred Creek; Alaska Gold Mining. Co.; Caribou Creek Mine, Willow Creek District, Matanuska-Susitna Borough, Alaska, USA
Latitude & Longitude (WGS84): | 61° 57' 0'' North , 147° 28' 47'' West |
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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] |
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