Unidentified Occurrence

The Unidentified Occurrence is a thorium mine located in Custer county, Colorado at an elevation of 8,999 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

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.

Site Name

Primary: Unidentified Occurrence
Secondary: Unnamed Prospect

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

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Surface
Discovery Year: 1951
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

Alterations

Alteration Type: L
Alteration Text: Red Staining Associated With Radioactivity

Rocks

Not available

Analytical Data

Analytical Data: .08 TO .14% EQUIV. U, .002% U, .44 TO .77% EQUIV. THO2

Materials

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

Comments

Comment (Location): 1000 FT SSW OF MAIN PIT ON THE NIGHTENGALE PROPERTY AND 1200 FT NW OF CHARLESTON PROPERTY ; INFO FROM LAND.ST :1976

Comment (Deposit): STRONGLY RADIOACTIVE ALONG VEIN

Comment (Workings): SINGLE PIT OF UNKNOWN DIMENSIONS

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. 24, 29

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.