1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (near VABM Upselat)

Occurrence in Alaska, United States with commodities Silver, Gold
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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 10307829
Record type Site
Current site name Unnamed (near VABM Upselat)

Geographic coordinates

Geographic coordinates: -155.93089, 62.39944 (WGS84)
Relative position This unnamed occurrence is situated on a distinct, northeast-trending ridgeline about 9 kilometers south of the Kuskokwim River and 4 kilometers southwest of VABM Upselat, at an elevation of 1,475 feet (450 m) in the NE1/4 sec. 27, T. 27 N., R. 36 W., of the Seward Meridian. The reporter investigated the site in 1977 and again in 1989 (as station nos. 77BT301 and 89BT69).

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-6(quadrangle 1:63,360 scale)

McGrath SW(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Stony River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Secondary

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Ferricrete oxidation common.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -155.93089, 62.39944
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is associated with a small, 2 square kilometer alaskite pluton that intrudes the Late Cretaceous Kuskokwim Group. A prominent northwest trending lineament - possibly a fault - forms the eastern boundary of the alaskite. The alaskite is undated, but thought to be correlative with other Late Cretaceous-early Tertiary plutonic suites in the Kuskokwim Mineral Belt (Bundtzen and Miller, 1997). A stockwork-bearing hornfels that crops out 1.5 kilometers east of the alaskite pluton may indicate a larger intrusion at depth. Mineralization occurs as ferricrete stained, pyritic-quartz veins and breccia in hornfels. Two chip samples collected of mineralized zones average 2.33 grams/tonne silver and 0.68 grams/tonne gold.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The reporter investigated the site in 1977 as part of an ADGGS minerals appraisal. Two chip samples collected from the mineralized zone in alaskite average 2.33 grams/tonne silver and 0.68 grams/tonne gold.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = This description

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 25-NOV-98 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.