The Twenty Grand Claim is a thorium and ree mine located in Custer county, Colorado at an elevation of 8,451 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: 8,451 Feet (2,576 Meters)
Commodity: Thorium, REE
Lat, Long: 38.21083, -105.32861
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.
Twenty Grand Claim MRDS details
Site Name
Primary: Twenty Grand Claim
Commodity
Primary: Thorium
Primary: REE
Location
State: Colorado
County: Custer
District: Wet Mountains Area; Mckinley Mountain 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-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
Alterations
Not available
Rocks
Name: Andesite
Role: Associated
Age Type: Associated Rock
Age Young: Cambrian
Analytical Data
Not available
Materials
Ore: Thorite
Gangue: Fluorite
Gangue: Quartz
Gangue: Galena
Gangue: Limonite
Gangue: Pyrite
Gangue: Barite
Comments
Comment (Location): NEAR RESERVOIR AT HEADWATERS OF RALPH GULCH ; INFO FROM LAND.ST :1976
Comment (Workings): SHAFT, PROSPECTS
Comment (Deposit): Discovery Year: EARLY 1950'S
References
Reference (Deposit): CHRISTMAN, R.A., BROCK, M.R., PEARSON, R.C. AND SINGEWALD, Q.D. 1959, GEOLOGY AND THORIUM DEPOSITS OF THE WET MOUNTAINS, COLORADO, A PROGRESS REPORT: USGS BULLETIN 1072-H, P.525-526
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
