Grapevine Mine

The Grapevine Mine is a uranium mine located in Jefferson county, Colorado at an elevation of 6,719 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

Satelite View

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Site Name

Primary: Grapevine Mine

Commodity

Primary: Uranium

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

Type: Underground

Ownership

Not available

Production

Year: 1960
Time Period: 1955-1960
Material type: ORE U
Description: Cp_Grade: ^0.37% U308
Year: 1959
Material type: ORE U
Description: Ap_Grade: ^0.15% U308
Year: 1956
Material type: U308
Description: Ap_Grade: ^0.47% U308
Year: 1955
Material type: ORE U
Description: Ap_Grade: ^0.33% U308

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1955
Year Last Production: 1968
Discovery Year: 1955
Discovery Method: Ore-Mineral Not 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: LENTICULAR

Structure

Type: R
Description: Denver Basin, Front Range Uplift

Type: L
Description: Bear Creek Shear Zone, Junction Ranch Fault, Cherry Gulch Fault

Alterations

Not available

Rocks

Name: Gneiss
Role: Host
Age Type: Host Rock Unit
Age Young: Neoproterozoic

Name: Gneiss
Role: Host
Age Type: Host Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: ORE GRADES RANGED FROM 0.15 TO 0.47% U308, WITH OVERALL AVERAGE 0.32 TO 0.37 % U308

Materials

Ore: Uraninite
Gangue: Quartz
Gangue: Feldspar
Gangue: Limonite
Gangue: Pyrite
Gangue: Hematite

Comments

Comment (Location): ALONG SAWMILL GULCH ; INFO FROM LAND.ST :(1976)

Comment (Production): PARTIAL PRODUCTION RECORD. NO PRODUCTION IN 1957. ANNUAL FIGURES FOR 1961-68 NOT AVAILABLE. FIGURES FOR 1955 AND 1960 INCLUDE SMALL AMOUNT OF PRODUCTION FROM QUATMAN LEASE. CUMULATIVE FOR 1955-68 FROM NELSON-MOORE AND OTHERS.

Comment (Deposit): PRINCIPAL VEINS LIE IN JUNCTION RANCH FAULT ZONE CLOSE TO ITS INTERSECTION WITH CHERRY GULCH FAULT. VEINS STRIKE NW AND DIP 20 TO 60 NE AND CUT PREDOMINANTLY BIOTITE-QUARTZ GNEISS. OLDER WORKINGS ON TARGET VEIN: NEWER WORKINGS ON EAST VEIN: BOTH VEINS APPARENTLY BRANCHES IN FOOTWALL OF WNW-STRIKING FAULT. LENTICULAR URANIUM ORE BODIES ARE 1 TO 2 FT WIDE. PITCHBLENDE COATS FRACTURES AND ALTERED BRECCIA FRAGMENTS. STRUCTURAL ZONE ON JUNCTION RANCH FAULT CAN BE INTERPRETED SIMILAR TO BRECCIA REEFS IN RALSTON CREEK DISTRICT TO NORTH.

Comment (Workings): OLDER WORKINGS INCLUDE 55-FT INCLINED SHAFT WITH PRODUCTION LEVELAT 30 FT. NEWER WORKINGS LIE 350 FT TO NORTH AND INCLUDE VERTICAL SHAFT WITH DRIFTS ON 92-FT LEVEL; 70 FT OF DRIFT ON TARGET VEIN, 235 FT OF DRIFTON EAST AND RELATED VEINS, 115 FT OF CROSSCUTS

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. 192

Reference (Deposit): SCOTT, GLENN R., 1972, GEOLOGIC MAP OF THE MORRISON QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-790 -A, 1:24,00

Reference (Deposit): KING, R.U., 1964, GRAPEVINE MINE, IN SIMS, P.K., AND SHERIDAN, D.M.,GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO; USGS BULL, 1159, P. 99-100

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. 192

Colorado Mining Photos

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