The Wright Lease is a uranium mine located in Jefferson county, Colorado at an elevation of 6,499 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: 6,499 Feet (1,981 Meters)
Commodity: Uranium
Lat, Long: 39.66528, -105.24778
Map: View on Google Maps
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Wright Lease MRDS details
Site Name
Primary: Wright Lease
Secondary: Foothills Mine
Commodity
Primary: Uranium
Tertiary: Copper
Tertiary: Lead
Tertiary: Zinc
Location
State: Colorado
County: Jefferson
District: Idledale 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
Year: 1958
Description: Ap_Grade: ^0.23% U308
Year: 1956
Description: Ap_Grade: ^0.30% U308
Year: 1955
Description: Ap_Grade: ^0.26% U308
Year: 1960
Time Period: 1955-1960
Description: Cp_Grade: ^0.26% U308
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1955
Year Last Production: 1964
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: Denver Basin, Front Range Uplift
Type: L
Description: Bear Creek Shear Zone, Junction Ranch Fault, Cherry Gulch Fault
Alterations
Alteration Type: L
Alteration Text: Fe Oxidation
Rocks
Name: Schist
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic
Name: Schist
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic
Analytical Data
Analytical Data: ORE GRADES RANGED FROM 0.23 TO 0.35% U308, WITH OVERALL AVERAGE 0.24 TO 0.26% U308
Materials
Ore: Pyrite
Ore: Pitchblende
Ore: Sphalerite
Ore: Chalcopyrite
Ore: Galena
Ore: Coffinite
Gangue: Calcite
Gangue: Ankerite
Gangue: Fluorite
Comments
Comment (Location): ALONG BEAR CREEK CANYON ; INFO FROM LAND.ST :(1976)
Comment (Production): PARTIAL PRODUCTION RECORD. ANNUAL FIGURES FOR 1961-64 NOT AVAILABLE. 1955-64 CUMULATIVE FROM NELSON-MOORE AND OTHERS
Comment (Deposit): DUPLICATE D002238 DELETED ; INFO.SRC : 1 PUB LIT
Comment (Deposit): PRINCIPAL VEIN IN BEAR CREEK SHEAR ZONE TRENDS N 20 TO 60 W, DIPPING 50 TO 80 NE. FOOTHILLS VEIN IS CURVED COMPOUND FRACTURE ZONE CONSISTING OF TWO OR MORE ANASTAMOSING SUBPARALLEL FISSURES, SUGGESTING RIGHT LATERAL MOVEMENT. SHARPLY DEFINED AND SLICKENSIDED WALLS ENCLOSE QUARTZ-CEMENTED BRECCIA IN CARBONATE MATRIX IN HANGING WALL. FIRST STAGE OF MINERALIZATION INCLUDED ANKERITE (?), PYRITE, K-FELDSPAR, CHLORITE, AND PITCHBLENDE FOLLOWED BY BRECCIATION. SECOND STAGE INCLUDED COARSE CALCITE, PURPLE FLUORITE, AND SULFIDES WITH SOME PITCHBLENDE AND K-FELDSPAR REPLACED BY CALCITE (?). ALTHOUGH COFFINITE MAY HAVE BEEN DEPOSITED WITH STAGE 1 PITCHBLENDE, MOST OCCURS WITH SOOTY PITCHBLENDE AS COATING ON PYRITE AND GANGUE, APPARENTLY A PRODUCT OF SUPERGENE SOLUTIONS. MAJOR STRUCTURAL ZONE COULD BE INTERPRETED AS SIMILAR TO BRECCIA-REEF URANIUM OCCURRENCES AT NEARBY GRAPEVINE MINE AND IN RALSTON CREEK DISTRICT TO NORTH.
Comment (Workings): CROSSCUT ADIT DRIVEN S 72 W FOR 475 FT. 400 FT OF DRIFT ON ADIT LEVEL. AT 80 FT FROM CROSSCUT ON ADIT LEVEL, VERTICAL SHAFT SUNK TO 186 FT. 180 FT OF DRIFT ON 86-FT LEVEL; 390 FT OF DRIFT ON 186-FT LEVEL.
References
Reference (Deposit): GABLE, D.J., 1968, GEOLOGY OF THE CRYSTALLINE ROCKS IN THE WESTERN PART OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS BULL. 1251-E
Reference (Production): SIMS AND SHERIDAN, 1964, P. 96; NELSON-MOORE AND OTHERS, 1978, P. 196
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. 196
Reference (Deposit): SCOTT, GLENN R., 1972, GEOLOGIC MAP OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-790-A, 1:24,000.
Reference (Deposit): SCHLOTTMAN, J.D., 1964, FOOTHILLS MINE, IN SIMS, P.K., AND SHERIDAN, D.M., GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO: USGS BULL. 1159, P. 96-98
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