Cora B Claim

The Cora B Claim is a thorium mine located in Custer county, Colorado at an elevation of 9,049 feet.

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

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Site Name

Primary: Cora B Claim
Secondary: Greenwood Property

Commodity

Primary: Thorium

Location

State: Colorado
County: Custer
District: Wet Mountains Area

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Henry G. Prior And Others
Years: 1953 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Surface-Underground
Discovery Year: 1952
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

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

Mineral Deposit Model

Model Name: Thorium-rare-earth veins

Orebody

Not available

Structure

Type: R
Description: Wet Mountains

Type: L
Description: Nw-Trending Shear Zones; Three Shear Zones

Alterations

Not available

Rocks

Name: Plutonic Rock
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Plutonic Rock
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Analytical Data

Analytical Data: .024 TO .026% EQUIV. U, .001% U, .13 TO .14% EQUIV. TH02

Materials

Ore: Thorite
Gangue: Barite
Gangue: Pyrite
Gangue: Hematite
Gangue: Galena
Gangue: Quartz
Gangue: Fluorite
Gangue: Limonite
Gangue: Siderite

Comments

Comment (Workings): TWO SHAFTS, FOUR PROSPECT PITS

Comment (Geology): STRONGEST RADIOACTIVITY ASSOCIATED WITH HEMATITE; STRONG FETID ODOR IN ROCK, ESPECIALLY IN QUARTZ; DEPOSIT SPACIALLY AND GENETICALLY RELATED TO CAMBRIAN ALKALIC COMPLEX

Comment (Location): ON GREENWOOD PROPERTY, THREE MILES NORTH OF THE HAPUTA RANCH; ABOUT 3/4 MILE NE OF DRY LAKE, EAST OF HWY 143 ; INFO FROM LAND.ST :1976

Comment (Deposit): Discovery Year: EARLY 1950'S

References

Reference (Deposit): CHRISTMAN, R.A., HEYMAN, A.M., DELLWIG, L.F, AND GOTT, G.B., 1953, THORIUM INVESTIGATIONS 1950-52, WET MOUNTAINS, COLORADO: USGS CIRCULAR 290, P. 17-19

Reference (Deposit): BROCK, M.R. AND SINGEWALD, Q.D., 1968, GEOLOGIC MAP OF THE MOUNT TYNDALL QUADRANGLE, CUSTER COUNTY, COLORADO: USGS MAP GQ-596, 1:24,000.

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.