The Alexander Shaft is a silver mine located in Custer county, Colorado at an elevation of 9,131 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: 9,131 Feet (2,783 Meters)
Commodity: Silver
Lat, Long: 38.10806, -105.34917
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.
Alexander Shaft MRDS details
Site Name
Primary: Alexander Shaft
Commodity
Primary: Silver
Secondary: Copper
Location
State: Colorado
County: Custer
District: Rosita
Land Status
Land ownership: Federal
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: Underground
Discovery Year: 1882
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: Epithermal veins
Orebody
Not available
Structure
Type: R
Description: Rosita Crater And Cauldron Complex
Type: L
Description: North-Trending Fissures Dipping About 65 Degrees East
Alterations
Alteration Type: L
Alteration Text: Strong Argillization
Rocks
Name: Andesite
Role: Associated
Age Type: Host Rock
Age Young: Oligocene
Name: Andesite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene
Name: Andesite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene
Analytical Data
Not available
Materials
Ore: Covellite
Ore: Malachite
Gangue: Calcite
Gangue: Barite
Comments
Comment (Geology): THE ROSITA ANDESITE IS RELATIVELY FRESH HERE
Comment (Deposit): Discovery Year: 1870-1895
Comment (Location): NEAR INVINCIBLE SHAFT AND PRINGLE HILL ; INFO FROM LAND.ST :(1976)
Comment (Development): A SHAFT WAS SUNK TO AN UNKNOWN DEPTH
References
Reference (Deposit): SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAPS I-1081.
Reference (Deposit): CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
