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  3. Mineral Resource Data System (MRDS)

Rhyolite

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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307434
Record type Site
Current site name Rhyolite

Geographic coordinates

Geographic coordinates: -148.06595, 64.88166 (WGS84)
Relative position The Rhyolite prospect is located on the north side of Ester Dome at the head of Nugget Creek. It is about 2,000 feet north of the top of Ester Dome, in the SE1/4 sec. 25, T. 1 N., R. 3 W., Fairbanks Meridian.

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Fairbanks D-3(quadrangle 1:63,360 scale)

Fairbanks N(quadrangle 1:100,000 scale)

Fairbanks C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Alteration

  • (Local) Supergene alteration is attributed to weathering. Hydrothermal alteration includes pervasive cross-cutting sericitic and silicic alteration and stockworks of quartz-sericite-sulfide veins spatially associated with megascopic and smaller scale, pre-existing brittle structures (Rogers and others, 1998).

Nearby scientific data

(1) -148.06595, 64.88166
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Rhyolite prospect occurs in Fairbanks Schist and is associated with a mafic sill cut by two megascopic faults (Rogers and others, 1998). The Fairbanks Schist in the area is composed of quartz-muscovite schist, quartzite, and chlorite-quartz schist (Newberry and others, 1996). Soil samples collected from 1990 to 1992 contain gold values in excess of 100 ppb gold. In 1998, drilling by Placer Dome Exploration, Inc., encountered gold intercepts as high as 2.66 ounces of gold per ton over 19.7 feet (Szumigala and Swainbank, 1999, p. 9). The high-grade gold mineralization is associated with a flat-lying fault (Rogers and others, 1998).

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Comments on the workings information

  • Workings / Exploration = From 1990 to 1992, American Copper and Nickel Co. collected soil samples, conducted an IP/resistivity geophysical survey, and drilled four core holes (Rogers and others, 1998). Placer Dome Exploration, Inc., drilled the Rhyolite prospect in 1998.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Rogers and others, 1998

General comments

Subject category Comment text
Deposit Model Name = Schist-hosted gold-quartz vein

Reporter information

Type Date Name Affiliation Comment
Reporter 31-JUL-01 J.R. Guidetti Schaefer and C.J. Freeman Avalon Development Corporation

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.