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
Elevation: 8,999 Feet (2,743 Meters)
Commodity: Thorium
Lat, Long: 38.12667, -105.31278
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.
Unidentified Occurrence MRDS details
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.
