The Mount Robinson deposit is a aluminum and potassium mine located in Custer county, Colorado at an elevation of 9,600 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: 9,600 Feet (2,926 Meters)
Commodity: Aluminum, Potassium
Lat, Long: 38.11389, -105.34500
Map: View on Google Maps
Satelite View
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Mount Robinson deposit MRDS details
Site Name
Primary: Mount Robinson deposit
Commodity
Primary: Aluminum
Primary: Potassium
Location
State: Colorado
County: Custer
District: Rosita Hills District
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: Deposit
Operation Category: Occurrence
Deposit Type: Hydrothermal alteration
Operation Type: Unknown
Discovery Year: 1890
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: M
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Physiographic Detail: Mount Robinson - Rosita Hills
Mineral Deposit Model
Not available
Orebody
Form: BROAD LENS (VOLCANIC CONDUIT)
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Silicification, Alunitization, Kaolinization. Alteration Of Rhyolite To Alunite By Solfataric Action
Rocks
Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Pliocene
Analytical Data
Analytical Data: 2 ANALYSES ARE 6.5 % AND 24.0 % ALUNITe
Materials
Ore: Diaspore
Ore: Alunite
Gangue: Barite
Gangue: Kaolinite
Gangue: Quartz
Comments
Comment (Development): ECON.COM: DEPOSIT IS LESS THAN 1 MI. FROM A ROAD, AND THERE IS LITTLE OVERBURDEN. ALUNITE IS CLOSELY LOCKED WITH QUARTZ.
Comment (Location): S CENTRAL PART OF ROSITA HILLS, ON MOUNT ROBINSON, ABOUT 1-1/4 MILE NNW OF ROSITA, IN THE SE/4 SEC 20, T 22 S, R 71 W.
Comment (Reserve-Resource): Estimated 1,200,000 tons alunite resource @ 6.5% alunite. (Thoenen, 1941)
Comment (Reserve-Resource): GREATER PART OF RESERVE IS INFERRED
Comment (Workings): NEARBY PITS, ADITS, MADE IN 1870'S FOR SILVER AND OTHER METALS, NOT FOR ALUNITE. SEVERAL TUNNELS AND SHAFTS WERE PLACED, THE SENECA TUNNEL BEING 600 FT. LONG ON THE EASTERN SLOPE OF THE HILL
Comment (Commodity): PROJECT 9350 - 01393 ALUNITE RESOURCES
References
Reference (Deposit): CROSS, C. W., 1912 , ALUNITE DEPOSITS OF ROSITA HILLS, COLORADO, USGS BULL. 511 , P. 38 - 41 .
Reference (Deposit): GARDNER, L. S., 1943 , UNPUB. REPT. IN USGS FILE
Reference (Deposit): 1878 DIREXPL UNKNOWN: PROSPECTING WORKS
Reference (Deposit): 1883 GEOLMAP W. CROSS: PUB. REPTS.
Reference (Deposit): 1940 RECON USBM: R. I. 3561
Reference (Deposit): 1942 RECON L. S. GARDNER: UNPUB. REPT.
Reference (Geology): SHARP, W.N., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081, 1:24,000.
Reference (Analytical Data): SRC.REF: THOENEN, J. R., 1941 , USBM R. I. 3561 , P. 13
Reference (Reserve-Resource): THOENEN, J. R., 1941 , ALUNITE RESOURCES OF THE UNITED STATES: USBM REPT. INV. 3561 , P. 13 - 14 .
Reference (Deposit): CROSS, C. W., 1891 , ON ALUNITE AND DIASPORE FROM THE ROSITA HILLS, COLORADO: AM. JOUR. SCI., 3RD SER., V. 41 , NO. 246 , P. 466 - 475 .
Reference (Deposit): CROSS, C. W., 1896 , GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPT., PT. 2 , P. 315 - 317 , 356 - 360 .
Colorado Mining Photos
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