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Mid Vein

Occurrence in Alaska, United States with commodities Gold, Arsenic
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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 10003263
MRDS ID A106005
Record type Site
Current site name Mid Vein

Geographic coordinates

Geographic coordinates: -166.67434, 53.93078 (WGS84)
Relative position Located approximately 1.2 km north of Makushin River between the Mak North and Makushin Valley prospects, about 2.5 km inland of Broad Bay and 1.25 km NW of the Makushin Valley prospect.

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 C-3(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

Ounalashka Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Arsenic Critical Secondary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) Regional propylitic alteration; no apparent wall-rock alteration around vein.

Mineral occurrence model information

Model code 105
USGS model code 25a-d
Deposit model name Epithermal vein, generic
Mark3 model number 119

Nearby scientific data

(1) -166.67434, 53.93078
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Very similar to Makushin Valley (UN009) vein; in particular the east-west trending part of the Makushin Valley vein system. Quartz veins occur in propylitically altered porphyritic andesite and andesitic volcaniclastic rocks of the Unalaska Formation (see Drewes and others, 1961). Discontinuously exposed for at least 900 m on strike, having a width of 5 to 7.5 m.
  • Age = Late Tertiary or younger

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 = Twelve channel samples collected along discontinuous outcrop. Six samples yielded gold values between 100 and 650 ppb. The 2 highest samples yielded 1,062 ppb (over 6 m) and 1,748 ppb (over 2 m) gold.

Reference information

Bibliographic references

  • Deposit

    Drewes, Harold, Fraser, G.D., Snyder, G.L., and Barnett, H.F., Jr., 1961, Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-S, p. 583-676.

  • Deposit

    Randolph, D.B., 1991, Unalaska project, 1990 final report: Battle Mountain Exploration Company, Alaska District, 62 p., 5 appendices, 15 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Randolph, 1991

General comments

Subject category Comment text
Deposit Model Name = Epithermal gold vein
Deposit Other Comments = See UN009, UN010

Reporter information

Type Date Name Affiliation Comment
Reporter 18-DEC-1992 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.