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Porphyry Mountain

Prospect in Alaska, United States with commodities Gold, Molybdenum, Copper
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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. Host and associated rocks
  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 10001036
MRDS ID A011713
Record type Site
Current site name Porphyry Mountain
Related records 10185383

Geographic coordinates

Geographic coordinates: -142.83554, 61.44467 (WGS84)
Relative position On western flank of Porphyry Mountain, 1.8 mi south of summit. Best location: MacKevett, 1974. Accurate within radius of 100 feet.

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

McCarthy B-5(quadrangle 1:63,360 scale)

McCarthy SW(quadrangle 1:100,000 scale)

McCarthy C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chitina River(hydrologic unit)

Copper River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Molybdenum Primary
Copper Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite

Nearby scientific data

(1) -142.83554, 61.44467
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Discontinuous, irregular molybdenite- and minor chalcopyrite-bearing quartz vein up to 0.5 cm thick following fault in Tertiary granodiorite pluton. Molybdenite localized along vein selvages.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nizina

Comments on the workings information

  • Workings / Exploration = About 120 m of underground workings. Channel and grab samples generally contained >2,000 ppm Mo and as much as 2.4 ppm Au and 100 ppm Cu (MacKevett and Smith, 1968).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = MacKevett and Smith, 1968

General comments

Subject category Comment text
Deposit Model Name = Lode: vein.

Reporter information

Type Date Name Affiliation Comment
Reporter 12-NOV-97 Leonard, K.R. U.S. Geological Survey
Reporter 12-NOV-97 Elliott, R.L. U.S. Geological Survey
Reporter 12-NOV-97 Richter, D.H. 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.