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Rae

Prospect in Alaska, United States with commodities Gold, Copper, Lead
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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 10000952
MRDS ID A011625
Record type Site
Current site name Rae
Alternate or previous names San Juan, Jennings Group

Geographic coordinates

Geographic coordinates: -149.25268, 61.77956 (WGS84)
Relative position At VABM Fish, 3,500 ft east-northeast of mouth of Hatcher Creek, a tributary of Fishhook Creek. Accurate within 1,500 ft. Locality 23 from Cobb (1972) and locality 19 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage D-7(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Susitna River(hydrologic unit)

Susitna River(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Hatcher Pass Management Area-East(State Special Management Area)

State Special Management Area ST(Type of land area)

ST(Federal land areas administered by ST)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Secondary
Lead Secondary

Comments on the commodity information

  • Ore Material = copper carbonates
  • Ore Material = copper carbonates

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Shear zone is oxidized (Capps, 1915).

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) -149.25268, 61.77956
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Fault or shear zone in gneissic quartz diorite contains clay or gouge with some quartz carrying free gold, chalcopyrite, pyrite, galena, and copper carbonates. Shear zone or fault is oxidized and is 8 to 18 inches thick. The zone strikes generally northeast and dips 43 N. Pegmatitic rocks with large crystals of quartz and feldspars containing gold reported nearby. Ore not similar to ore in the rest of the district (Capps, 1915).? the gneissic quartz diorite is part of the Willow Creek Pluton, a Late Cretaceous zoned pluton: the outer part consists of hornblende quartz diorite and lesser hornblende tonalite; the core consists of hornblende-biotite granodiorite, and lesser hornblende-biotite quartz monzodiorite and biotite quartz monzonite.
  • Age = Late Cretaceous or younger; shear zone cuts the Late Cretaceous Willow Creek Pluton.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the workings information

  • Workings / Exploration = Explored primarily by open cuts. There is not enough data to prove or disprove the presence of valuable ore bodies in the vein cutting the gneissic quartz diorite, but pegmatitic rocks show encouraging assays indicating gold to be present (Capps, 1915).

Reference information

Bibliographic references

  • Deposit

    Capps, S.R., 1914, Gold lodes and placers of the Willow Creek district: U.S. Geological Survey Bulletin 592, p. 245-272.

  • Deposit

    Capps, S.R., 1915, The Willow Creek District, Alaska: U.S. Geological Survey Bulletin 607, 86 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

    Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Comments on the references

  • Primary Reference = Capps, 1915

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins ? (Cox and Singer, 1986; model 36a ?)
Deposit Other Comments = Capps (1915) reports the San Juan and Rae prospects separately, however because these prospects are very near one another, they are are often reported together as one. The San Juan prospect, contains the pegmatitic material with reported good assays, while the Rae prospect (part of the Jennings Group) has insufficient data about the vein.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss 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.