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

Unnamed

Occurrence in Alaska, United States with commodity Zinc
Map
XML
JSON
KML
C
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  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 10308657
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -153.82983, 62.22348 (WGS84)
Relative position This occurrence is exposed in outcrops on the south bank of a prominent, unnamed eastern fork of Windy Fork at an elevation of 3,100 feet (945 m) in the SW1/4 sec. 25, T. 25 N., R. 25 W., of the Seward Meridian. The reporter visited the site in 1982.

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

McGrath SE(quadrangle 1:100,000 scale)

McGrath(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Zinc Critical Primary

Materials information

Materials Type of material
Pyrite Ore
Sphalerite Ore

Mineral occurrence model information

Model code 208
USGS model code 31a
Deposit model name Sedimentary exhalative Zn-Pb
Mark3 model number 13

Nearby scientific data

(1) -153.82983, 62.22348
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence is a stratiform sulfide zone in the Lower Ordovician to Lower Silurian Post River Formation, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The sulfide bearing zone is estimated to be about 1.5 meters thick and consists of several thin pyritiferous layers with traces of sphalerite observed (Bundtzen and others, 1988). Two chip samples taken across 3 meters of the sulfide-bearing shale averaged 395 ppm zinc.
  • Age = Inferred to be Late Ordovician to Early Silurian.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = Kristi McDonald of the Alaska Division of Geological and Geophysical Surveys found and sampled the occurrence in 1982 while measuring section in the Lower Paleozoic black shales of the Post River Formation (Churkin and Carter, 1996). Two chip samples taken across 3 meters of the sulfide-bearing shale exposure averaged 395 ppm zinc (Bundtzen and others, 1988).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Bundtzen and others, 1988

General comments

Subject category Comment text
Deposit Model Name = Sedimentary exhalitive lead zinc (?) (Cox and Singer, 1986; model 31a).
Deposit Other Comments = See unnamed stratiform occurrence at site MG071.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-DEC-1998 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.