The Ascension Mine is a uranium mine located in Jefferson county, Colorado at an elevation of 6,955 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: 6,955 Feet (2,120 Meters)
Commodity: Uranium
Lat, Long: 39.77972, -105.29028
Map: View on Google Maps
Satelite View
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Ascension Mine MRDS details
Site Name
Primary: Ascension Mine
Secondary: Nair Prospect
Secondary: Nare Lease
Commodity
Primary: Uranium
Tertiary: Copper
Tertiary: Lead
Location
State: Colorado
County: Jefferson
District: Ralston Buttes 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
Type: Unknown
Ownership
Owner Name: Cotter Corp.
Home Office: Golden, Co.
Years: 1972 -
Production
Year: 1956
Material type: ORE U
Description: Ap_Grade: ^0.23% U3o8
Year: 1972
Time Period: 1956-1972
Material type: ORE U
Description: Cp_Grade: ^0.23% U3o8
Deposit
Record Type: Site
Operation Category: Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1956
Year Last Production: 1972
Discovery Year: 1955
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
Not available
Orebody
Not available
Structure
Type: R
Description: Front Range Uplift, Denver Basin
Type: L
Description: Hurricane Hill Fault System, Ascension Fault
Alterations
Not available
Rocks
Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Pegmatite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Analytical Data
Analytical Data: AVERAGE ORE GRADES OF 0.23 TO 0.26% U3O8
Materials
Ore: Uraninite
Ore: Galena
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Fluorite
Gangue: Quartz
Gangue: Ankerite
Gangue: Calcite
Comments
Comment (Deposit): BELT OF LAYERED CALC-SILICATE GNEISS TRENDS N 70 TO 90 E. DEPOSIT LIES ON BRANCH OF HURRICANE HILL FAULT SYSTEM KNOWN AS ASCENSION FAULT, WHICH TRENDS N 62 W, 66 TO 85 NE AND IS ACTUALLY COMPOSED OF SEVERAL SUBPARALLEL ANASTAMOSING FAULT SURFACES. ASCENSION FAULT FORMS V-SHAPED BLOCK WITH SECOND FAULT TO NE TRENDING LESS NW, BOTH SHOWING RIGHT-LATERAL DISPLACEMENT. PITCHBLENDE OCCURS AS COLLOFORM COATINGS ON QUARTZ- AND CARBONATE-CEMENTED BRECCIA FRAGMENTS IN HANGING WALL OF ASCENSION FAULT AND AS THIN STRINGERS ON SUBSIDIARY FAULTS AND FRACTURES.
Comment (Location): 130 FT. WEST OF TUCKER GULCH; 0.2 MILE NW OF POINT WHERE TUCKER GULCH AND CRAWFORD GULCH MERGE TO FORM GOLDEN GATE CANYON ; INFO FROM LAND.ST :(1975)
Comment (Production): NO PRODUCTION IN INTERVENING YEARS OR AFTER 1972. SHERIDAN AND OTHERS REPORT LOWER PRODUCTION THAN CITED ABOVE FOR 1960. CUMULATIVE ORE TOTAL INCLUDES ESTIMATED 853 ST FOR 1961 BASED ON AVERAGE ORE GRADE OF 0.23% U3O8.
Comment (Workings): SURFACE EXPLORATORY CUTS; 16-FT-LONG UPPER ADIT; 425 FT OF WORKINGS ON MAIN LEVEL FROM ADIT DRIVEN GENERALLY WESTWARD
Comment (Deposit): DUPLICATE D002241 DELETED ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
References
Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULL. 40, P. 190
Reference (Deposit): SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520.
Reference (Deposit): SIMS, P.K., AND SHERIDAN, D.M., 1964, GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO: USGS BULL. 1159, P. 92-93
Reference (Production): SHERIDAN AND OTHERS, 1967, P. 75; COLORADO DIV. MINES ANN. OPERATORS REPTS. 1957-1972
Colorado Mining Photos
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