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  3. Mineral Resource Data System (MRDS)

Portage Creek

Occurrence in Alaska, United States with commodities Gold, Silver
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10003593
MRDS ID A106350
Record type Site
Current site name Portage Creek

Geographic coordinates

Geographic coordinates: -154.01267, 60.38443 (WGS84)
Relative position Prospect is located about 3.6 km north of the mouth of Portage Creek. Locality 23 of Nelson and others (1985) and locality 15 of MacKevett and Holloway (1977). Sec. 5, T. 3 N., R. 27 W., of the Seward Meridian. Locality accurate within 800 m.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark B-3(quadrangle 1:63,360 scale)

Lake Clark SE(quadrangle 1:100,000 scale)

Lake Clark C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lake Clark(hydrologic unit)

Kvichak-Port Heiden(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Lake Clark National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) The metamorphic rocks consist mostly of chlorite, epidote, and fibrous amphibole (Nelson and others, 1983).

Nearby scientific data

(1) -154.01267, 60.38443
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Only information is that lode claims (U.S. Bureau of Mines, 1973) are located along part of the Lake Clark fault. ? Near the claims, the fault separates metamorphic rocks of Paleozoic to Mesozoic age and Tertiary volcanic rocks. The claims appear to straddle the Lake Clark Fault and span both lithologies. According to Nelson and others (1983, unit MzPzm), metamorphosed mafic volcanic rocks are the most widespread rocks of this unit; they are aphanitic and were probably originally composed of plagioclase and pyroxene, and locally olivine and amphibole. These rocks have been altered, and they now consist mostly of chlorite, epidote, and fibrous amphibole. Other lithologies of this unit include: phyllite, schist, quartzite, marble, calc-silicate rocks, serpentinite, gabbro, and chert. Unit Tv is described by Nelson and others (1983) to include rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
  • Age = Unknown

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Unknown

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Nelson and others, 1985

General comments

Subject category Comment text
Deposit Model Name = Unknown
Deposit Other Comments = Site is in Lake Clark National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 D.P. Bickerstaff 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.