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  3. Mineral Resource Data System (MRDS)

Joker Group

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. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10308490
Record type Site
Current site name Joker Group

Geographic coordinates

Geographic coordinates: -146.77198, 65.4317 (WGS84)
Relative position The Joker Group can be reached via an 8 mile long dirt road that starts in Circle Hot Springs. The claims are above the confluence of Bottom Dollar and Half -Dollar Creeks. The coordinates are for the approximate center of the Joker Group claims.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Circle B-6(quadrangle 1:63,360 scale)

Circle SW(quadrangle 1:100,000 scale)

Circle(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

White Mountains National Recreation Area(National Recreation Area)

National Recreation Area BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type

Nearby scientific data

(1) -146.77198, 65.4317
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The bedrock in the Joker claims groups is primarily porphyritic igneous rock containing large K-spar phenocrysts. Visible gold is found in the quartz veins. Both lode and placer gold are found at these claims (Vetter, 1995). Wiltse and others (1995) mapped the bedrock in the area as Cretaceous chloritized porphyritic (hornblende) biotite monzogranite to syenogranite. They also mapped a mafic dike in the area of the 88 Group claims which is described as black to dark gray, aphanitic to slightly porphyritic, with major plagioclase, augite, hornblende and magnetite. The granite is exposed along several ditches where it is deeply weathered and fractured. Abundant visible gold is seen in the stockwork veining. The light yellow color of the gold suggests a high silver content. Placer gold from the creeks below has a fineness of 750. Sampling in the vicinity of the Joker claims failed to delineate any significant extent to the stockwork veining; however, the trend of the stockwork veining is parallel to the ditch exposure, which is not as continuous as that at the 88 Group (Bakke,1991).
  • Age = Mineralization is later than the Cretaceous granitic host rocks.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Comments on the workings information

  • Workings / Exploration = Surface samples taken.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Vetter, 1995.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-SEP-1998 C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation) 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.