|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This mine is on the south side of Bedrock Creek about one-third mile west of the center of section 35, T. 20 S., R. 16 E., Fairbanks Meridian. The location of the main cut on Bedrock Creek is shown in Moffit (1944). The mine is near locality 27 of Cobb (1979 [OFR 79-238]). Bedrock Creek is lumped with other nearby mines and prospects as locality 68 by MacKevett and Holloway (1977) and is locality 15 in table 3 of Nokleberg and others (1991). The location is accurate.|
Bedrock Creek cuts through a section of bench gravel as much as 75 feet thick into hard bedrock of unknown lithology. During the Pleistocene the creek was a discharge channel for the glacier that fed the major glacier in the valley of the Middle Fork Chistochina River (Moffit, 1944).Placer gold occurs in the bench gravels and is locally concentrated on layers of clay-rich or cemented gravel false bedrock. The cut on Bedrock Creek yielded a nugget that weighed about 0.15 ounce, the largest gold nugget found in the Middle Fork prospect area (Moffit, 1944). The principle heavy minerals found in the placer deposits are, in decreasing order of abundance, magnetite, pyrite, chromite, garnet, galena, and olivine (?).
|Geologic map unit||(-144.638131502069, 63.1375079426535)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Pleistocene.|
|Workings or exploration||Bedrock Creek was prospected in the early days of the district and was included with Limestone (MH309), Kraemer (MH311), and other nearby creeks in a consolidated claim group owned by the Middle Fork Mining Company of Seattle (Moffit, 1944). The properties were explored and developed for production by 1941. Due at least in part to World War II, there was, however, no extensive mining.|
|Indication of production||Undetermined|
|Reserve estimates||There is a possible low-grade but large gold placer deposit in bench deposits on the west side of the Middle Fork Chistochina River (Moffit, 1944).|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 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.
Moffit, F.H., 1944, Mining in the northern Copper River region, Alaska: U.S. Geological Survey Bulletin 943-B, p. 25-47.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Sciences) and C.C Hawley (Hawley Resource Group)|
|Last report date||7/12/2003|