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
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.
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.
Principal Gold Districts of Montana
In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.
