Unnamed (north of Humpback Lake)

Prospect in Alaska, United States with commodities Copper, Molybdenum

Geologic information

Identification information

Deposit ID 10001596
MRDS ID A012356
Record type Site
Current site name Unnamed (north of Humpback Lake)
Related records 10136930

Geographic coordinates

Geographic coordinates: -130.51366, 55.06864 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Molybdenum Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Magnetite Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore

Mineral occurrence model information

Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -130.51366, 55.06864

Comments on the geologic information

  • Geologic Description = 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, in press).? 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.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = The deposit has been drilled by private interests, but the results of that exploration have not been made public.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012356
USGS Alaska Resource Data File ARDF KC111

Bibliographic references

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    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 MF-1807,27 p., scale 1:250,000.

  • Deposit

    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, p. 208-211.

  • Deposit

    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: Boulder, Colorado, Geological Society of America Special Paper 343, p. 1-21.?

Comments on the references

  • Primary Reference = Elliott and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Metamorphosed Besshi massive sulfide? (Cox and Singer, 1986; model 24b)
Deposit Other Comments = the site is in Misty Fiords National Monument Wilderness.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-JUL-1999 H.C. Berg U.S. Geological Survey