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  3. Mineral Resource Data System (MRDS)

Unnamed (east of Mt. Recheshnoi)

Occurrence in Alaska, United States with commodities Silver, Gold, Arsenic, Mercury, Molybdenum
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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 10308468
Record type Site
Current site name Unnamed (east of Mt. Recheshnoi)

Geographic coordinates

Geographic coordinates: -168.44237, 53.14907 (WGS84)
Relative position This site is located near the southeast coast of central Umnak Island approximately 4 miles due east of Mt. Recheshnoit an elevation of about 1000 feet. It is in T. 81 S., R. 133 W., of the Seward Meridian The location is accurate to within 1/2 mile.

Site location context

Political divisions (FIPS codes)

Aleutians West(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Umnak A-2(quadrangle 1:63,360 scale)

Umnak Island(quadrangle 1:100,000 scale)

Umnak(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
Silver Primary
Gold Primary
Arsenic Critical Secondary
Mercury Secondary
Molybdenum Secondary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) The rocks exhibit propylitization with local argillization.

Mineral occurrence model information

Model code 104
USGS model code 25a
Deposit model name Hot-spring Au-Ag
Mark3 model number 45

Nearby scientific data

(1) -168.44237, 53.14907
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This site was reported as the Mt. Recheshnoi prospect by Randolph and Ellis (1989). The rocks consist of altered andesites of Late Tertiary to Quaternity age. The occurrence is a 500 x 2600 foot color anomaly which exhibits propylitic alteration and localized argillization. Quartz occurs both as individual veins and as stockworks. Most of the veins exhibit propylitization and pyritization envelopes up to several feet on either side. In one locality, noted by Randolph and Ellis, several inches of blue-gray pyritic clay envelops comb-structure quartz-filled joints. Six samples of clay muck and vein material contained up to 72 ppm arsenic, 186 ppb gold, 2.6 ppm mercury, 19 ppm molybdenum, and 4.7 ppm silver (Randolph and Ellis, 1989, p. 11).
  • Age = Tertiary or younger.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Aleution Islands

Comments on the workings information

  • Workings / Exploration = Six samples of clay and quartz collected by Battle Mountain Exploration (Randolph and Ellis, 1989) contained up to 72 ppm arsenic, 186 ppb gold, 2.6 ppm mercury, 19 ppm molybdenum, and 4.7 ppm silver.

Reference information

Bibliographic references

  • Deposit

    Randolph, D.B., and Ellis, W.T., 1989, Unalaska project, 1989 final report: Battle Mountain Exploration Company, Alaska District, 41 p., 5 appendices, 11 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Randolph and Ellis, 1989

General comments

Subject category Comment text
Deposit Model Name = Hot-spring Au-Ag? (Cox and Singer, 1986; model 25a)
Deposit Other Comments = This site is located on land selected by the Aleut Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-JAN-00 S.H. Pilcher 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.