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  3. Mineral Resource Data System (MRDS)

Beaver Inlet, Erskine Bay, Kisselem Bay

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

Geologic information

Identification information

Deposit ID 10003275
MRDS ID A106018
Record type Site
Current site name Beaver Inlet, Erskine Bay, Kisselem Bay

Geographic coordinates

Geographic coordinates: -166.58572, 53.72411 (WGS84)
Relative position Point of land separating Erskine Bay and Kisselem Bay, Beaver Inlet. Anomaly no. 11 of Christie (1974).

Site location context

Political divisions (FIPS codes)

Aleutians West(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

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

Unalaska NW(quadrangle 1:100,000 scale)

Unalaska SE(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fox Islands(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Alaska Maritime National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Primary
Gold Primary
Zinc Critical Secondary

Materials information

Materials Type of material
Pyrite Ore
Chlorite Gangue

Alteration

  • (Local) Chlorite is the only alteration phase mentioned and may indicate propylitic alteration. However, bleaching (leaching) may indicate other types of alteration. Alteration ranges from moderate to very intense.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4
Model code 105
USGS model code 25a-d
Deposit model name Epithermal vein, generic
Mark3 model number 119

Nearby scientific data

(1) -166.58572, 53.72411
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Orange, brown, and purple color anomaly, 300 ft (90 m) by 1500 ft (450 m) confined to feldspar porphyry andesite. Anomaly is oriented along ridge crest, essentially east-west. Color is due to weathering of very finely disseminated pyrite. Narrow N-S trending shear zones are especially leached and fractured; their original sulfide content was indeterminate due to the extensive leaching and alteration in the shear zones. Some zones, especially one at extreme east end of point of land, may represent zones of bleaching and alteration due to solfataric activity. Fracturing ranges from poor to intense. Other associated rocks include amygdaloidal andesite and minor coarse-grained diorite. No visible sulfides were seen in the dioritic intrusive.
  • Age = Cenozoic

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutians

Comments on the workings information

  • Workings / Exploration = Eighteen soil samples were collected in the course of reconnaissance mapping, samples contained up to 123 ppm copper, 102 ppm zinc, 1.7 ppm silver, and 0.02 ppm gold.

Reference information

Bibliographic references

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Christie, 1974

General comments

Subject category Comment text
Deposit Model Name = Copper porphyry, epithermal gold vein
Deposit Model Number = 17, 25

Reporter information

Type Date Name Affiliation Comment
Reporter 03-MAY-1994 Damon Bickerstaff U.S. Geological Survey
Reporter 03-MAY-1994 F.H. Wilson 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.