Unnamed

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000887
MRDS ID A011541
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -152.63087, 62.30756 (WGS84)
Relative position Reed and others (1978, locality 34) locate this occurrence on a tributary to the Kichatna River, in the northwest quarter of Section 33, T. 26 N., R. 18 W., of the Seward Meridian, at about 4100 feet within the Denali National Park and Preserve.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite

Nearby scientific data

(1) -152.63087, 62.30756

Comments on the geologic information

  • Geologic Description = Disseminations of chalcopyrite, pyrite, pyrrhotite and other sulfides occur in narrow mineralized fracture fillings within the Kichatna stock, a composite stock of primarily olive-bearing pyroxene quartz monzonite (Reed and Nelson, 1980). ? the Kichatna stock is one of the nine composite plutons (Tcp) within a 65-km-long belt described by Reed and Nelson (1980), that extends from Mt. Estelle in the southwest to Cascade Creek in the northeast. These Late Cretaceous/early Tertiary composite plutons intrude Mesozoic marine sedimentary rocks (KJs) and at one locale, in the upper West Fork of the Yentna River, crosscut the fault boundary between the Mesozoic strata and Paleozoic rocks, Pzus of Reed and Nelson (1980). Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973). ? Also see TL020, TL023, TL052, and TL053.
  • Age = Late Cretaceous/early Tertiary; mineralization is interpreted to be linked to the Kichatna stock, one of the Tertiary composite plutons mapped by Reed and Nelson (1980).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yentna

Comments on the workings information

  • Workings / Exploration = Reconnaissance mapping, stream silt and rock sampling are all that have been done here. Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from these plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992; Foley and others, 1997). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011541
USGS Alaska Resource Data File ARDF TL050

Bibliographic references

  • Deposit

    Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.

  • Deposit

    Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., and Reed, B.L., 1980, Summaries of data and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.

  • Deposit

    Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

  • Deposit

    Foley, J.Y., Light, T.D., Nelson, S.W., and Harris, R.A., 1997, Mineral occurrences associated with mafic-ultramafic and related alkaline complexes in Alaska: Economic Geology, Monograph 9, p. 396-449.

  • Deposit

    Mertie, J.B., Jr., 1919, Platinum-bearing gold placers of the Kahiltna Valley: U.S. Geological Survey Bulletin 692-D, p. 233-264.

  • Deposit

    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.

Comments on the references

  • Primary Reference = Reed and Nelson, 1980

General comments

Subject category Comment text
Deposit Model Name = This occurrence does not specifically fit any of those defined by Cox and Singer (1986). It may be a variation of the Porphyry copper model (Cox and Singer, 1986; model 17).
Deposit Other Comments = This occurrence is located within the Denali National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-AUG-1998 Madelyn A. Millholland Millholland & Associates