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Unnamed (northeast of upper Shotgun Creek)

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Platinum, Chromium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

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).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Healy A-6(quadrangle 1:63,360 scale)

Healy S(quadrangle 1:100,000 scale)

Healy(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chulitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Platinum Critical Secondary
Chromium Critical 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
    Rock type
    Stratigraphic age (youngest) Devonian

Nearby scientific data

(1) -149.86282, 63.06958
ListMap

Economic information

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 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

Bibliographic references

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.