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  3. Mineral Resource Data System (MRDS)

Unnamed (north of Mount Hamilton)

Prospect in Alaska, United States with commodity 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 10308202
Record type Site
Current site name Unnamed (north of Mount Hamilton)

Geographic coordinates

Geographic coordinates: -159.79685, 61.22133 (WGS84)
Relative position This prospect is on the crest of a ridge north of Mount Hamilton and east of Ophir Creek, near a local summit with an elevation of 1,310 feet. The map site is at the northeast corner of sec. 14, T. 13 N., R. 59 W., of the Seward Meridian. This is locality 1 of Frost (1990). The location is probably accurate within one-quarter mile.

Site location context

Political divisions (FIPS codes)

Bethel(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Russian Mission A-3(quadrangle 1:63,360 scale)

Russian Mission SE(quadrangle 1:100,000 scale)

Russian Mission(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Kuskokwim Delta(hydrologic unit)

Lower Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • Gangue = iron oxide

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Calcite Gangue
Chlorite Gangue
Quartz Gangue

Alteration

  • (Local) Sericitization and silicification.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Nearby scientific data

(1) -159.79685, 61.22133
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Frost (1990) described gold- and pyrite-bearing quartz veins cutting sericitized andesite and volcaniclastic hornfels at this location. The veins are vuggy and contain euhedral quartz prisms extending into open spaces. Other gangue minerals in the iron oxide-stained veins are commonly calcite and chlorite. A quartz vein from this prospect contained 12 ppm gold and 10 ppm silver (Frost, 1990, sample locality 1). Bedrock in the area includes thermally metamorphosed Jurassic volcanic or volcaniclastic rocks (Box and others, 1993). The thermal metamorphism is caused by a large mid-Cretaceous granitic pluton exposed to the west of Ophir Creek.
  • Age = Cretaceous or Tertiary. The gold-bearing quartz veins crosscut hornfels developed in country rocks around a mid-Cretaceous granitic pluton.

Economic information about the deposit and operations

Development status Prospect

Mining district

District name Aniak

Comments on the workings information

  • Workings / Exploration = Prospecting pit(s) are present at this location.

Reference information

Bibliographic references

  • Deposit

    Frost, T.P., 1990, Geology and geochemistry of mineralization in the Bethel quadrangle, southwestern Alaska, in Goldfarb, R. J., Nash, J. T., and Stoeser, J. W., eds., Geochemical studies in Alaska by the U.S. Geological Survey, 1989: U.S. Geological Survey Bulletin 1950, p. C1-C9.

  • Deposit

    Box, S.E, Moll-Stalcup, E.J., Frost, T.P., and Murphy, J.M., 1993, Preliminary geologic map of the Bethel and southern Russian Mission quadrangles, southwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2226-A, 20 p., scale 1:250,000.

Comments on the references

  • Primary Reference = Frost, 1990

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-01 Travis L. Hudson Applied Geology
Reporter 10-JUN-01 Madelyn A. Millholland Millholland & Associates

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.