Unnamed (on Mount Harding)

Occurrence in Alaska, United States with commodities Silver, Copper

Geologic information

Identification information

Deposit ID 10002206
MRDS ID A013106
Record type Site
Current site name Unnamed (on Mount Harding)

Geographic coordinates

Geographic coordinates: -135.43211, 59.41975 (WGS84)
Relative position This occurrence is near the summit of Mount Harding on its northeast side. It is in the northeast corner of section 30, T. 28 S., R. 59 E. of the Copper River Meridian. It is shown as mineral occurrence 9 on sheet 1 of Redman and others (1984) and as map number S076 by Wells and others (1986).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrrhotite Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss

Nearby scientific data

(1) -135.43211, 59.41975

Comments on the geologic information

  • Geologic Description = The following description is from Redman and others (1989). Small, up to 2.5-inch-long, massive pods of pyrrhotite with traces of chalcopyrite in quartz are associated with a fault zone which cuts high grade paragneiss and the Late Cretaceous to early Paleocene, Ferebee pluton. A sample of the pyrrhotite contained 555 ppm copper and 3.1 ppm silver. The Late Cretaceous to early Paleocene age of the Ferebee pluton establishes a maximum age for the mineralization.
  • Age = Late Cretaceous or younger, based on the age of the Ferebee pluton (Redman and others, 1984).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013106
USGS Alaska Resource Data File ARDF SK023

Bibliographic references

  • Deposit

    Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.

  • Deposit

    Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska; U.S. Geological Survey Open-File Report 85-717, 332 p.

Comments on the references

  • Primary Reference = Redman and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Pods of cupriferous, massive sulfides in a fault zone (Redman and others, 1984).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates