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Neptune

Occurrence in Alaska, United States with commodities Lead, Zinc, 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. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mining district
  10. Links to other databases
  11. Bibliographic references
  12. Reporter information

Geologic information

Identification information

Deposit ID 10308659
Record type Site
Current site name Neptune

Geographic coordinates

Geographic coordinates: -153.64283, 62.27948 (WGS84)
Relative position The Neptune occurrences are located in an unnamed east-flowing tributary of Post River, at an elevation of 3,100 feet near the center of sec. 1, T. 25 N., R. 24 W., of the Seward Meridian. The location of the occurrences is derived from a rough sketch map made by Anaconda Minerals Company in 1981, and is considered to be accurate to within about one half kilometer.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McGrath B-2(quadrangle 1:63,360 scale)

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Cook Inlet Region, Incorporated(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Zinc Critical Primary
Silver Secondary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore

Nearby scientific data

(1) -153.64283, 62.27948
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Neptune occurrences are a small cluster of unexplained but highly anomalous lead, zinc, and silver values (values unstated) in an area capped by the Late Cretaceous, Veleska Lake Volcanic field (Bundtzen, Harris, and Gilbert, 1997). Scattered occurrences of galena and sphalerite in fault-controlled quartz veins may be the source of these anomalies (Brewer and others, 1992).
  • Age = Unknown; may be related to Late Cretaceous, Veleska Lake Volcanic Field (Bundtzen, Harris, and Gilbert, 1997).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Neptune occurrences were found by the Anaconda Minerals Company in 1980 or 1981 (Brewer and others, 1992). High lead, zinc, and silver anomalies (unstated values) may be derived from galena-sphalerite quartz veins in the area, but more work is recommended.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Brewer and others, 1992

Reporter information

Type Date Name Affiliation Comment
Reporter 20-APR-1999 T.K. Bundtzen Pacific Rim Geological Consulting

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.