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Yankee Fork Placer

Past Producer in Custer county in Idaho, United States with commodities Gold, Silver
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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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10070999
MRDS ID W014171
MAS/MILS ID 0160370409
Record type Site
Current site name Yankee Fork Placer
Alternate or previous names Snake River Mining Co. Placer

Geographic coordinates

Geographic coordinates: -114.72483, 44.34209 (WGS84)
Elevation 1829
Relative position 3.5 MI NORTH OF SUNBEAM, IDAHO

Site location context

Political divisions (FIPS codes)

Custer(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sunbeam(quadrangle 1:24,000 scale)

White Cloud Peaks(quadrangle 1:100,000 scale)

Challis(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Salmon(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Salmon-Challis National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Custer

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 012N 015E 32,17,20,29 Idaho

Comments on the location information

  • WORKINGS OCCUPY THE VALLEY OF YANKEE FORK FOR 5.5 MI. DOWNSTREAM OF JORDAN CREEK.

Commodities

Commodity Importance
Gold Primary
Silver Tertiary

Materials information

Materials Type of material
Electrum Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Latite
    Rock unit name Challis Volcanics-Rhyolite, Andesite, Latite;Idaho Batholith-Quartz Monzonite
    Rock description Challis Volcanics-Rhyolite, Andesite, Latite;Idaho Batholith-Quartz Monzonite
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Unconsolidated Deposit > Sand and Gravel

Nearby scientific data

(1) Granodiorite and two-mica granite.
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Idaho Batholith

Ore body information

  • General form IRREGULAR
    Thickness 0.25M
    Width 45.72M

Controls for ore emplacement

  • Buried Stream Bed

Economic information about the deposit and operations

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

Mining district

District name Yankee Fork District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner J. R. Simplot Co.

Comments on the production information

  • $ 1,120,000 AU PRODUCED DURING 8 OF YEARS ABOVE

Comments on the reserve resource information

  • ABOUT $10,000,000 AU REMAINING

Workings at the site

  • Type of workings Surface
    Overall length 8448.83M
    Overall width 121.92M

Comments on the workings information

  • A LARGE DREDGE OPERATED IN 8 OF THE 13 YEARS FROM 1940 - 1952

Comments on development

  • MUCH OF THE GOLD IS STILL IN THE RIVER; NOT ALL OF THE "PAY STREAK" WAS FOLLOWED; AND MUCH OF THE GOLD WAS NOT COLLECTED BY THE DREDGE.

Reference information

Bibliographic references

  • Deposit

    CHOATE, RAOUL, 1962, GEOLOGY AND ORE DEPOSITS OF THE STANLEY AREA: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 126, 120 P

  • Deposit

    1962 GEOLMAP IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 12

  • Deposit

    U.S. BUREAU OF MINES OPEN-FILE REPORT MLA 6-91, 1991, TABLE A-3, NO. 419, P. 205.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1975 Yett, Jay R.; Miller, Pat U.S. Geological Survey
Reporter 04-NOV-1992 McHugh, Edward L. U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site