|Quadrangle map, 1:250,000-scale||KC|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The approximate location of this gold placer claim, known only from U. S. Bureau of Mines (1977) claim records, is on the southeast shoreline of Martin Arm, about 0.3 mile northeast of the mouth of Red River. The map site is in section 32, T. 77 S., R. 99 E., of the Copper River Meridian, at the mine symbol shown on the 1:63,360-scale Ketchikan A-2 topographic map (1955 ed., rev. 1975). Assuming that the mine symbol represents this prospect, the location is accurate within a hundred feet or so. The site corresponds to loc. 106 in Elliott and others (1978).|
The country rocks in the general area of this prospect include Tertiary or Cretaceous foliated granodiorite and quartz diorite of the Coast Range batholith, and pelitic paragneiss that forms roof pendants and screens in the batholith (Berg and others, 1988). The paragneiss represents marine sedimentary strata that were regionally metamorphosed to amphibolite grade in Cretaceous or Tertiary time. The premetamorphic age of the paragneiss is uncertain, but it probably is mainly Paleozoic and may be as old as Precambrian (Berg and others, 1988, p. 26; Gehrels and others, 1990; Crawford and others, 2000).According to U.S. Bureau of Mines claim records (1977), this prospect, which appears to be in an area underlain chiefly by granodiorite and paragneiss, was staked as a gold placer claim. No other information about it has been made public.
|Geologic map unit||(-130.53068770935, 55.147667762638)|
|Mineral deposit model||Alluvial Au placer (Cox and singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Holocene.|
|Indication of production||None|
Additional commentsThe site is in Misty Fiords National Monument Wilderness.
Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000.
Crawford, M.L., Crawford, W.A., and Gehrels, G.E., 2000, Terrane assembly and structural relationships in the eastern Prince Rupert quadrangle, British Columbia, in H.H. Stowell and W.C.McClelland, eds., Tectonics of the Coast Mountains, southeastern Alaska and British Columbia: Geological Society of America Special Paper 343, p. 1-21.
Elliott, R.L., Berg, H.C., and Karl, S.M.,1978, Map and table describing metalliferous and selected non-metalliferous mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73B, 17 p., 1 sheet, scale 1:250,000.
Gehrels, G.E., McClelland, W.C., Samson, S.D., Patchett, P.J., and Jackson, J.L., 1990, Ancient continental margin assemblage in the northern Coast Mountains, southeast Alaska and northwest Canada: Geology, v. 18, no. 3, p. 208-211.
U.S. Bureau of Mines, 1977, Claim map, Ketchikan quadrangle: U.S. Bureau of Mines Map 120, scale 1:250,000.
|Reporters||H.C. Berg, USGS|
|Last report date||7/5/1999|