Unnamed (northeast of upper Shotgun Creek)

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Platinum, Chromium

Geologic information

Identification information

Deposit ID 10000731
MRDS ID A011370
Record type Site
Current site name Unnamed (northeast of upper Shotgun Creek)

Geographic coordinates

Geographic coordinates: -149.86282, 63.06958 (WGS84)
Relative position The prospect is at an elevation of about 5,000 feet on the divide about a mile northeast of upper Shotgun Creek. The map site is on the boundary of secs. 21 and 28, T. 21 S., R. 12 W., of the Fairbanks Meridian. The location is accurate to within 1 mile. This is location 36-C of Hawley and Clark (1974); locality 25 of Cobb (1978: OFR 78-1062); and locality E35 of Balen (1990: OFR 34-90).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Platinum Secondary
Chromium Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Chromite Ore

Alteration

  • (Local) Serpentinite of ultramafic hostrocks.

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Devonian

Nearby scientific data

(1) -149.86282, 63.06958

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this prospect consist largely of sheared, Devonian serpentinite that forms lenticular and podiform tectonic blocks as much as several hundred meters in size. The prospect consists of chalcopyrite-rich sulfide bodies in the serpentinite. Chromite pods also occur in the serpentinite and platinum group elements may be present. Three samples contained 0.7 ppm silver, 0.04 to 0.06 ppm gold, 300 to 1,500 ppm chromium, 70 to 7,000 ppm copper, 100 to 1,000 ppm nickel, and a trace of platinum (Hawley and others, 1969).
  • Age = The ore minerals probably were magmatic segregations in Devonian ultramafic hostrocks, and were partly redistributed during subsequent serpentization.
  • Age = Host rock is Devonian.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Valdez Creek

Comments on the workings information

  • Workings / Exploration = Preliminary surface exploration only. Three samples contained 0.7 ppm silver, 0.04 to 0.06 ppm gold, 300 to 1,500 ppm chromium, 70 to 7,000 ppm copper, 100 to 1,000 ppm nickel, and a trace of platinum (Hawley and others, 1969).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011370
USGS Alaska Resource Data File ARDF HE064

Bibliographic references

  • Deposit

    Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. 1-47, 2 sheets, scale 1:12,000 and 1:48,000.

  • Deposit

    Kurtak, J.M., Balen, M.D., and Fechner, S.A., 1988, Results of 1987 Bureau of Mines investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 43-88, 132 p., 2 sheets.

  • Deposit

    Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines Investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.

  • Deposit

    Hawley, C.C., Clark, A.L., Herdrick, M.A., and Clark, S.H.B., 1969, Results of geological and geochemical investigations in an area northwest of the Chulitna River, central Alaska Range: U.S. Geological Survey Circular 617, 19 p.

Comments on the references

  • Primary Reference = Hawley and others, 1969

General comments

Subject category Comment text
Deposit Model Name = Podiform chromite (Cox and Singer, 1986; model 8a)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-2000 N. Van Wyck Stevens Exploration Management Corporation