Eldorado Bar

The Eldorado Bar is a gold and silver mine located in Lewis and Clark county, Montana.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Name: Eldorado Bar  

State:  Montana

County:  Lewis and Clark

Elevation:

Primary Mineral: Gold, Silver

Lat, Long: 46.73639, -111.85083

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Eldorado Bar

Eldorado Bar MRDS details

Site Name

Primary: Eldorado Bar


Commodity

Primary: Gold
Primary: Silver
Secondary: Osmium
Secondary: Platinum
Secondary: Iridium
Secondary: Palladium
Secondary: Gemstone
Secondary: Corundum


Location

State: Montana
County: Lewis and Clark
District: Missouri River Terraces


Land Status

Not available


Holdings

Not available


Workings

Not available


Ownership

Owner Name: Watts Griffis And Mcouat (Wgm)
Home Office: Toronto, Canada
Years: 1994 -

Owner Name: American Gem
Years: 1994 -


Production

Year: 1944
Time Period: 1938 - 1944
Mined: 10000000.000 cy
Material type: gravel
Description: Cp_Grade: ^10 Million Cu Yds Gravel At 20 Cents/Yd


Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: M


Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains


Mineral Deposit Model

Not available


Orebody

Form: RIVER SANDS AND GRAVELS


Structure

Not available


Alterations

Not available


Rocks

Name: Gravel
Role: Host
Age Type: Host Rock
Age Young: Holocene


Analytical Data

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


Materials

Ore: Gold
Ore: Sapphire


Comments

Comment (Commodity): THE SAPPHIRES ARE NATURALLY PALE, BUT CAN BE HEAT-TREATED TO ACHIEVE A DEEPER BLUE COLOR.

Comment (Production): .006 OZ AU TON

Comment (Development): IN SEPTEMBER, 1994, WGM WAS CONDUCTING INITIAL TESTS FOR RENEWED SAPPHIRE MINING IN THIS AREA.

Comment (Workings): 10 MILLION CU YDS OF MATERIAL HANDLED IN 6.5 YEARS

Comment (Deposit): FROM 1992-1994, AMERICAN GEM ACQUIRED CONTROL OF MOST OF THE HISTORIC SAPPHIRE-PRODUCING AREAS IN MONTANA.

Comment (Reserve-Resource): RESOURCE WAS ESTIMATED FOR 260 ACRES OF THE 1200 ACRE PROPERTY.


References

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

Reference (Production): MERTIE 1951, P. 80

Reference (Reserve-Resource): THE NORTHERN MINER, 1994.

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