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Eldorado Bar

Past Producer in Lewis and Clark county in Montana, United States with commodities Gold, Silver, Platinum, Osmium, Iridium, Palladium, Gemstone, Corundum
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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. Ownership information
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10038144
MRDS ID M045432
Record type Site
Current site name Eldorado Bar
Related records 10124261

Geographic coordinates

Geographic coordinates: -111.85171, 46.73629 (WGS84)
Relative position ON NORTH BANK OF MISSOURI RIVER 7.75 MILES NORTHWEST OF CANYON FERRY.

Site location context

Political divisions (FIPS codes)

Lewis and Clark(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hauser Lake(quadrangle 1:24,000 scale)

Canyon Ferry Dam(quadrangle 1:100,000 scale)

White Sulphur Springs(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Missouri(hydrologic unit)

Upper Missouri(hydrologic accounting unit)

Missouri-Marias(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Helena-Lewis and Clark 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 Montana Lewis and Clark

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 011N 002W 09,10 Montana

Commodities

Commodity Importance
Gold Primary
Silver Primary
Platinum Critical Secondary
Osmium Secondary
Iridium Critical Secondary
Palladium Critical Secondary
Gemstone Secondary
Corundum Secondary

Comments on the commodity information

  • THE SAPPHIRES ARE NATURALLY PALE, BUT CAN BE HEAT-TREATED TO ACHIEVE A DEEPER BLUE COLOR.

Materials information

Materials Type of material
Gold Ore
Sapphire Ore

Analytical data

Result PER 100 LB OF CONCENTRATES, PT= 7.86 OZ, OS - IR= .56 OZ, PD= .42 OZ

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Stratigraphic age (youngest) Holocene

Nearby scientific data

(1) -111.85171, 46.73629
ListMap

Economic information

Ore body information

  • General form RIVER SANDS AND GRAVELS
    Depth to top 4.57M

Economic information about the deposit and operations

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

Mining district

District name Missouri River Terraces

Ownership information

  • Type Operator
    Owner Watts Griffis And Mcouat (Wgm)
    Home office Toronto, Canada
    First year 1994
  • Type Owner
    Owner American Gem
    First year 1994

Production statistics

  • Year 1944
    Period 1938 - 1944
    Material gravel
    Ore mined 10000000cy
    Accuracy Estimate
    Description Cp_Grade: ^10 Million Cu Yds Gravel At 20 Cents/Yd

Comments on the production information

  • .006 OZ AU TON

Comments on the reserve resource information

  • RESOURCE WAS ESTIMATED FOR 260 ACRES OF THE 1200 ACRE PROPERTY.

Comments on the workings information

  • 10 MILLION CU YDS OF MATERIAL HANDLED IN 6.5 YEARS

Comments on development

  • IN SEPTEMBER, 1994, WGM WAS CONDUCTING INITIAL TESTS FOR RENEWED SAPPHIRE MINING IN THIS AREA.

Reference information

Bibliographic references

  • Deposit

    MERTIE, J.B., JR., ET AL, 1951, GEOL. CANYON FERRY, MONTANA: USGS BULL. 972, P. 79-80.

  • Deposit

    THE NORTHERN MINER, 1994, AMERICAN GEM PRODUCING SAPPHIRES IN MONTANA: V. 80, NO. 30, P. 1, 10, 11.

  • Production

    MERTIE 1951, P. 80

  • Reserve-Resource

    THE NORTHERN MINER, 1994.

General comments

Subject category Comment text
Deposit FROM 1992-1994, AMERICAN GEM ACQUIRED CONTROL OF MOST OF THE HISTORIC SAPPHIRE-PRODUCING AREAS IN MONTANA.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-FEB-1975 Blair, Will N. U.S. Geological Survey
Updater 14-DEC-1994 Orris, Greta J. U.S. Geological Survey

Beyond USGS

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

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