The Four Corners Mine is a uranium mine located in Jefferson county, Colorado at an elevation of 5,840 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: 5,840 Feet (1,780 Meters)
Commodity: Uranium
Lat, Long: 39.63583, -105.17000
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.
Four Corners Mine MRDS details
Site Name
Primary: Four Corners Mine
Secondary: Pallaoro Lease
Secondary: Morrison Mine
Commodity
Primary: Uranium
Secondary: Vanadium
Tertiary: Molybdenum
Location
State: Colorado
County: Jefferson
District: Foothill 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
Not available
Production
Year: 1956
Description: Ap_Grade: ^0.23% U308
Year: 1955
Description: Ap_Grade: ^0.19% U308
Year: 1960
Time Period: 1955-1960
Description: Cp_Grade: ^0.19% U308
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1955
Year Last Production: 1960
Discovery Year: 1954
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
Form: WEDGE, LENTICULAR
Structure
Type: R
Description: Denver Basin, Front Range Uplift
Type: L
Description: Golden Fault, Damming Fault
Alterations
Not available
Rocks
Name: Sandstone
Role: Host
Age Type: Host Rock Unit
Age Young: Late Cretaceous
Name: Sandstone
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous
Analytical Data
Analytical Data: PRINCIPAL ORE GRADES RANGED FROM 0.19 TO 0.23% U308, OVERALL 0.19% U308
Materials
Ore: Uraninite
Gangue: Pyrite
Gangue: Ilsemannite
Comments
Comment (Production): NO PRODUCTION IN 1958 AND 1959. NELSON-MOORE AND OTHERS (1978) CITE V205 PRODUCTION. DISCREPANCY BETWEEN SOURCES AS TO TOTAL PRODUCTION; RICHTER'S FIGURES USED FOR ANNUALS, CUMUL. ORE, AND CUMUL. U308.
Comment (Deposit): URANINITE AND URANIFEROUS ASPHALT (PROBABLY RELATED TO OIL SEEPS IN AREA) COAT SAND GRAINS AND FILL INTERSTICES IN SANDSTONE AND TO SMALL EXTENT FILL FRACTURES IN DAMMING FAULT ZONE. SOME ORE IS SPHEROIDAL AND COMPOSED OF CONCENTRIC BANDS OF URANINITE AROUND PYRITE GRAIN. ORE BODIES ARE ELONGATED, THIN, DISCONTINUOUS WEDGES AND LENSES PARALLEL TO INTERSECTION OF DAMMING FAULT AND BEDDING. MOST MINED ORE CAME FROM HANGING WALL OF FAULT ALTHO SOME FOUND IN FOOTWALL. GOLDSTEIN (1957) BELIEVED URANIUM TO BE OF PRIMARY ORIGIN AND WAS PRECIPITATED FROM ASCENDING HYDROTHERMAL SOLUTIONS ALONG DAMMING FAULT AT ZONES OF FAVORABLE SANDSTONE PERMEABILITY.
Comment (Workings): 75-FT VERTICAL SHAFT WITH LEVELS AT 62 AND 75 FT. DRIFTS ON 75-FT LEVEL EXTEND ABOUT 200 FT TO NW AND ABOUT 100 FT TO SE
Comment (Location): ON NORTH SIDE OF TURKEY CREEK AT BOTTOM OF DAKOTA HOGBACK, JUST ACROSS CREEK FROM MANN RANCH MINE ; INFO FROM LAND.ST :(1976)
References
Reference (Production): RICHTER, 1964, P. 102-103; NELSON-MOORE AND OTHERS (1978), P. 194
Reference (Deposit): SCOTT, G.R., 1972, GEOLOGIC MAP OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-790-A
Reference (Deposit): RICHTER, D.H., 1964, FOUR CORNERS URANIUM MINE, IN SIMS, P.K., AND SHERIDAN, D.M., GEOLOGY OF URANIUM DEPOSITS IN FRONT RANGE, COLORADO: USGS BULL. 1159, P. 102-103, PL. 5.
Reference (Deposit): GOLDSTEIN, E.H., 1957, GEOLOGY OF THE DAKOTA FORMATION URANINITE DEPOSIT NEAR MORRISON, COLORADO: ECON. GEOLOGY, V. 52, NO. 7, P. 775-785
Reference (Deposit): NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 194
Colorado Mining Photos
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