Unnamed (west of Tukgahgo Mountain)

Occurrence in Alaska, United States with commodities Silver, Copper

Geologic information

Identification information

Deposit ID 10002204
MRDS ID A013104
Record type Site
Current site name Unnamed (west of Tukgahgo Mountain)

Geographic coordinates

Geographic coordinates: -135.68211, 59.29975 (WGS84)
Relative position This occurrence is at an elevation of about 1,500 feet, 1.7 miles west of the summit of Tukgahgo Mountain. It is in the south-central part of section 5, T. 30 S., R. 57 E. of the Copper River Meridian. It is shown as mineral occurrence 7 on sheet 1 of Redman and others (1984) and as number S048 by Wells and others (1986).
(click for info)

Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46
Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite

Nearby scientific data

(1) -135.68211, 59.29975

Comments on the geologic information

  • Geologic Description = Redman and others (1984) describe this occurrence as a series of chalcopyrite-bearing quartz veins that cut a diorite dike in metabasalt. The veins are 1 to 10 inches thick and at least 35 feet long. A representative sample contained 520 ppm copper and 0.3 ppm silver. The diorite dike is probably the same age as the nearby mid-Cretaceous, Mount Kashagnak pluton.
  • Age = Mid-Cretaceous or younger based on the age of the dike cut by the veins (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 A013104
USGS Alaska Resource Data File ARDF SK026

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 = Quartz sulfide veins (Cox and Singer, 1986; model 22c or 36a).

Reporter information

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