The Boulder Mine is a silver mine located in Custer county, Colorado at an elevation of 8,051 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: 8,051 Feet (2,454 Meters)
Commodity: Silver
Lat, Long: 38.14056, -105.43833
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.
Boulder Mine MRDS details
Site Name
Primary: Boulder Mine
Secondary: Boulder-Buffalo
Commodity
Primary: Silver
Secondary: Manganese
Secondary: Iron
Location
State: Colorado
County: Custer
District: Silver Cliff
Land Status
Land ownership: BLM Administrative Area
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
Type: Surface
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
Discovery Year: 1895
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: Silver Cliff Volcanic Center, Wet Mtns, Wet Mtn Valley
Type: L
Description: Large Nw-Trending Fault
Alterations
Alteration Type: L
Alteration: argillic
Alteration Text: Weak Argillization
Rocks
Name: Clay, Mud
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene
Name: Clay, Mud
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene
Name: Clay, Mud
Role: Associated
Age Type: Host Rock
Age Young: Miocene
Analytical Data
Not available
Materials
Ore: Cerargyrite
Ore: Psilomelane
Ore: Ocher
Gangue: Kaolin
Comments
Comment (Location): NE OF GEYSER MINE NORTH OF UNNAMED TRIBUTARY TO CHLORIDE GULCH ; INFO FROM LAND.ST :(1976)
Comment (Development): THE BOULDER AND BUFFALO HUNTER MILL WAS ERECTED TO TREAT ORES FROM BOTH MINES
Comment (Workings): SEVERAL CUTS
Comment (Geology): ORE OCCURS IN CONCENTRIC SHELLS SURROUNDING SPHERULITES IN PARTLY DECOMPOSED ZONE
References
Reference (Deposit): CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.
Reference (Deposit): EMMONS, S.F., 1896, THE MINES OF CUSTER COUNTY, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 405-472.
Reference (Deposit): SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.
Colorado Mining Photos
Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.
