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

Judy

Prospect in Alaska, United States with commodities Copper, Gold
Map
XML
JSON
KML
B
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 10307492
Record type Site
Current site name Judy

Geographic coordinates

Geographic coordinates: -144.05265, 62.98969 (WGS84)
Relative position The Judy prospect is on Granite Creek 1 to 1.5 miles above its junction with Slana River. It is locality 20 of Richter and Matson (1972) and locality 10 of MacKevett and Holloway (1977). The prospect was explored by Kirk Stanley who gave its location as in Granite Creek about 1.5 miles above the Slana River (written communication, 2000).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Gulkana D-1(quadrangle 1:63,360 scale)

Gulkana NE(quadrangle 1:100,000 scale)

Gulkana(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Copper River(hydrologic unit)

Copper River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Gold Ore
Magnetite Ore
Malachite Ore
Pyrite Ore
Garnet Gangue

Alteration

  • (Local) Contact metamorphism; formation of fine-grained garnet in limestone adjacent to quartz diorite.

Mineral occurrence model information

Model code 58
USGS model code 18a
Deposit model name Porphyry Cu, skarn-related
Mark3 model number 9

Nearby scientific data

(1) -144.05265, 62.98969
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The Judy prospect is a copper-gold skarn associated with limestone of uncertain affiliation that is intruded by quartz diorite. The prospect is an isolated occurrence exposed along Granite Creek for about 200 feet. It is masked by soil and heavy brush away from the creek and the outcrops are conspicuously stained with malachite. Pyrite and chalcopyrite are common; magnetite occurs locally in altered limestone. The prospect was drilled with shallow AX diameter core-holes; short intercepts of high-grade gold values were encountered.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Chistochina

Comments on the workings information

  • Workings / Exploration = The prospect was explored by short geophysical lines and small diameter diamond-drill core holes. The maximum depth of these holes was about 150 feet.

Reference information

Bibliographic references

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = This report

General comments

Subject category Comment text
Deposit Model Name = Copper-gold skarn (Cox and Singer, 1986; model 18a)
Deposit Other Comments = the best reference to this deposit is in a review of the 'Slana Mineral Belt prospects' by Kirk Stanley,' which is included in an interoffice memo of Ahtna Minerals Corp. (written communication to Wes Nason, 2000). This memo includes color photographs of the prospect. Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-DEC-00 W.T. Ellis Alaska Earth Sciences
Reporter 04-DEC-00 Hawley, C.C. Hawley Resource Group
Reporter 04-DEC-00 W.J. Nokleberg 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.