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  3. Mineral Resource Data System (MRDS)

Unnamed (in Port Dick)

Prospect in Alaska, United States with commodities Gold, Silver, Copper, Zinc
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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 10000472
MRDS ID A010651
Record type Site
Current site name Unnamed (in Port Dick)

Geographic coordinates

Geographic coordinates: -151.35947, 59.31253 (WGS84)
Relative position The prospects are about a mile and a quarter west of the head of Port Dick in the NW 1/4 section 17, T.10 S., R. 12 W., of the Seward Meridian, and the NE 1/4 of section 18, T.10 S., R. 12 W., of the Seward Meridian. The lower adit is about 200 feet above sea level, and the upper adit is about 500 feet above sea level. This is Cobb's (1972, MF-397) location 14. This location is accurate within a quarter of a mile.

Site location context

Political divisions (FIPS codes)

Kenai Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Seldovia B-4(quadrangle 1:63,360 scale)

Seldovia SE(quadrangle 1:100,000 scale)

Seldovia C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Resurrection River-Frontal Resurrection Bay(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Copper Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) None reported.

Mineral occurrence model information

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 Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock
    Rock unit name Valdez Group
    Rock description Valdez Group;Valdez Group

Nearby scientific data

(1) Kumc
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rock at the head of the West Arm of Port Dick is hornfelsed graywacke and greenstones of the Cretaceous Valdez Group that have been intruded by fine-grained biotite granite dikes of Tertiary age (MacKevett and Holloway, 1978). The quartz veins are nearly vertical and cut both the granite dikes and the graywacke. The lower prospect is at about 200 feet of elevation where an adit 140 feet long was driven on a vein that strikes N54W and dips 75 to 85N. The vein ranges from 6 to 20 inches in width and averages 15 inches thick. The vein consists of quartz with segregations of arsenopyrite and pyrite that give the vein a banded appearance. The upper vein at an elevation of about 500 feet is about 500 feet to the south. It is about 24 inches thick. An adit 310 feet long has been driven N69W along strike on the vein. The upper vein is similar to the lower vein and contains traces of sphalerite and small fractures filled with calcite. The wall rock is a fine-grained granite (Brooks, 1909).
  • Age = Tertiary; veins cut Tertiary granite dikes.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Homer

Comments on the production information

  • Production Notes = None reported.

Comments on the reserve resource information

  • Reserves = None reported.

Comments on the workings information

  • Workings / Exploration = Several hundred feet of tunnels were driven in 1899, and 1904 through 1907 by the Alaska Commercial Company. A grab sample provided to Brooks (1909) assayed at 0.123 ounces of gold and 1.32 ounces of silver per ton. There is no reported production from this location.

Reference information

Bibliographic references

  • Deposit

    Brooks, A.H., 1909, The mining industry in 1908: U.S. Geological Survey Bulletin 379-A, p. 21-62.

  • Deposit

    Martin G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Cobb, E.H., 1972, Metallic minerals resources map of the Seldovia quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-397, 1 sheet, scale 1:250,000.

  • 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.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than minerals fuels and construction materials) in the Seldovia quadrangle, Alaska: U.S. Geological Survey Open-file Report 80-87, 47 p.

Comments on the references

  • Primary Reference = Brooks, 1909

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide, Au-quartz vein (Cox and Singer, 1986; model 36a)
Deposit Other Comments = This prospect is within Kachemak Bay State Wilderness Park; the area is withdrawn from mineral entry.

Reporter information

Type Date Name Affiliation Comment
Reporter 03-FEB-99 Jeff A. Huber U.S. Geological Survey

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.