Hansen Ore Body

The Hansen Ore Body is a uranium mine located in Fremont county, Colorado at an elevation of 8,199 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

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Site Name

Primary: Hansen Ore Body

Commodity

Primary: Uranium

Location

State: Colorado
County: Fremont
District: Tallahassee Creek

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

Owner Name: Cyprus Mines Corp., Wyoming Minerals
Home Office: Denver, Co.
Years: 1982 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Discovery Year: 1979
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: L

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Model Name: Sandstone U

Orebody

Form: TABULAR, PODS

Structure

Type: R
Description: Thirtynine Mile Volcanic Field, Currant Creek Basin

Type: L
Description: Echo Park Graben, Paleovalley; Deposit Is On Outside Of Paleovalley Meander. The Orebody Is Bounded By Two Burled, High Angle, Normal Faults; One On The Southeast And Another Which May Parallel The Western Edge Of The Orebody.

Alterations

Alteration Type: L
Alteration Text: Oxidation; Alteration Of Feldspar To Clay

Rocks

Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Early Permian

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Early Permian

Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Analytical Data

Not available

Materials

Ore: Coffinite
Ore: Uraninite
Gangue: Limonite
Gangue: Hematite

Comments

Comment (Workings): DRILLING, PRELIMINARY SURFACE PREPARATIONS FOR AN OPEN-PIT MINE

Comment (Deposit): THE DEPOSIT IS SIMILAR TO ROLL-FRONT DEPOSITS IN THE TERTIARY BASINS OF WYOMING BUT WITHOUT THE DISTINCT CRESCENT SHAPE OF THOSE DEPOSITS

Comment (Development): DISCOVERED BY DRILLING BY RAMPART EXPLORATION CO. UNDER CONTRACT TO CYPRUS

Comment (Geology): DEPOSITS LOCALIZED AND PRESERVED BY SLUGGISH GROUNDWATER MOVEMENT IN AREA. THOSE CONDITIONS STILL PRESENT AS EVIDENCED BY ARTESIAN PRESSURE IN WELLS AND SPRINGS ISSUING FROM ECHO PARK FORMATION AND BY A PRESENT URANIUM CONTENT OF GROUNDWATER IN AREA AS HIGH AS 900 PPB.

Comment (Location): THE DEPOSIT LIES IN THE VALLEY OF MIDDLE TALLAHASSEE CREEK; THE LOCATION GIVEN HERE IS FOR THE CENTER OF THE DEPOSIT ; INFO FROM LAND.ST :(1982)

Comment (Reserve-Resource): Deposit was drilled by Cyprus Mines Corp. in late 1970s and early 1980s. Information from Dickinson (1981). The Hansen orebody is the largest know deposit in the district.

References

Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B. AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULLETIN 40, P. 148.

Reference (Deposit): EPIS, R.C., WOBUS, R.A. AND SCOTT, G.R., 1979, GEOLOGIC MAP OF THE BLACK MOUNTAIN QUADRANGLE, FREMONT AND PARK COUNTIES, COLORADO: USGS MAP I-1195, 1:62,500.

Reference (Deposit): BABCOCK, J.A., 1980, TALLAHASSEE CREEK URANIUM DEPOSITS: DENVER REGIONAL EXPLORATION GEOLOGISTS SOCIETY GUIDEBOOK, P. 15-31.

Reference (Deposit): DICKINSON, K.A., 1981, GEOLOGIC CONTROLS OF URANIUM MINERALIZATION IN THE TALLAHASSEE CREEK URANIUM DISTRICT, FREMONT COUNTY, COLORADO: THE MOUNTAIN GEOLOGIST, V. 18, NO. 4, P. 88-94.

Reference (Deposit): 5) CYPRUS MINES CORPORATION, 1979, ENVIRONMENTAL REPORT, HANSEN PROJECT, FREMONT COUNTY, COLORADO: CYPRUS MINES CORP./WYOMING MINERAL CORP., P. 2.4.1-2.4.28.

Reference (Reserve-Resource): BABCOCK, J.W., 1980

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