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  3. Mineral Resource Data System (MRDS)

Twelvemile Creek Placer

Past Producer 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. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10000594
MRDS ID A011049
Record type Site
Current site name Twelvemile Creek Placer
Alternate or previous names Forks of Twelvemile Creek, Potato Creek
Related records 10112096

Geographic coordinates

Geographic coordinates: -151.50338, 67.49967 (WGS84)
Location accuracy 10000(meters)
Relative position TRIBUTARY W NW SIDE OF MIDDLEFORK 18 MI SW OF WISEMAN

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Wiseman B-4(quadrangle 1:63,360 scale)

Wiseman SE(quadrangle 1:100,000 scale)

Wiseman C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
027N;028N 013W;013W 03,04,05,06,07,08;20,22,27,29,31,34 Alaska

Comments on the location information

  • LOCATION MIDWAY BETWEEN UPPER FORK AND LOWER FORK. EXTENT OF PLACER NOT CLEARLY KNOWN, PROBABLY WITHIN 3 MI UPSTREAM AND DOWNSTREAM FROM LOCATION ON MAIN AND TRIBUTARY CHANNELS

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore

Analytical data

Result GOLD FINENESS 914 (BENCH).

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel

Nearby scientific data

(1) -151.50338, 67.49967
ListMap

Economic information

Ore body information

  • Thickness 2.74M

Comments on the geologic information

  • GEOL.COM: GEOLOGY DESCRIPTION OF HIGHEST BENCH PLACER OF TWO PRESENT. BOULDERS UP TO 2 FT IN DIAMETER, PREDOMMANTLY GREENSTONE, MINOR QTZ DIORITE, GNEISS. ; MAJOR.UNITS: BEDROCK IS GRAPHITE AND QUARTZITE SCHIST.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Koyukuk District

Comments on the production information

  • MAIN HIGH BENCH YIELDED 75 CENTS PER CU YD. SOME RAN 35 CENTS PER SQ FT BEDROCK (1937).

Comments on development

  • EXPL.COM: DRIFTING, SLUICING, HYDRALIC MINING (1937) PROPERTY WAS ACTIVE 1900-09, INTERMITTANTLY TO 1935 AND IN 1937.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit BURIED PLACER APPARENTLY MINOR CONTRIBUTOR TO PRODUCTION. GRAVELSON HIGH BENCH ARE 6 TO 9 FT THICK WITH GOLD THROUGHOUT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-84 Bliss, James D. U.S. Geological Survey
Editor 14-APR-95 Waller, Nichelle (Mosier, Dan) U.S. Geological Survey PUT DIMENSION DATA INTO THE ORE BODY FIELDS FROM THE DEPOSIT COMMENTS FIELD.

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.