|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 prospect is at an elevation of about 1500 feet, about 2.4 miles north-northwest of the east end of Humpback Lake. The site is in section 33, T. 78 S., R. 99 E., of the Copper River Meridian. It corresponds to loc. 108 in Elliott and others (1978), who refer to it as 'Red River.' The location is accurate within 0.2 mile.|
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 they probably are 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 Elliott and others (1978), who attribute their information to an oral communication from Kenneth Eichner, the property owner at that time, the deposit consists of pyrite, chalcopyrite, pyrrhotite, magnetite, bornite, and molybdenite that occur as scattered grains along gneissic bands in pelitic paragneiss. The metamorphic rocks presumably are part of a roof pendant in the Coast Range batholith. The mineralized bands range from an inch or so to about 100 feet thick. The deposit has been drilled by private interests, but the results of that exploration have not been made public.
|Geologic map unit||(-130.513681508594, 55.0686632344617)|
|Mineral deposit model||Metamorphosed Besshi massive sulfide? (Cox and Singer, 1986; model 24b)|
|Mineral deposit model number||24b?|
|Workings or exploration||The deposit has been drilled by private interests, but the results of that exploration have not been made public.|
|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.
|Reporters||H.C. Berg, USGS|
|Last report date||7/5/1999|