Unnamed (north of Humpback Lake)

The Unnamed (north of Humpback Lake) is a copper and molybdenum mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (north of Humpback Lake)

Commodity

Primary: Copper
Primary: Molybdenum

Location

State: Alaska
District: Ketchikan

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Massive sulfide, Besshi (Japanese deposits)

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Bornite
Ore: Chalcopyrite
Ore: Magnetite
Ore: Molybdenite
Ore: Pyrite
Ore: Pyrrhotite

Comments

Comment (Reference): Primary Reference = Elliott and others, 1978

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

Comment (Deposit): Model Name = Metamorphosed Besshi massive sulfide? (Cox and Singer, 1986; model 24b)

Comment (Deposit): Other Comments = the site is in Misty Fiords National Monument Wilderness.

Comment (Geology): 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.

References

Reference (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.

Reference (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.

Reference (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.

Reference (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.?

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