Marshall Pass No. 5 Mine

The Marshall Pass No. 5 Mine is a uranium and vanadium mine located in Saguache county, Colorado at an elevation of 10,098 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

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.

Site Name

Primary: Marshall Pass No. 5 Mine

Commodity

Primary: Uranium
Primary: Vanadium
Tertiary: Lead

Location

State: Colorado
County: Saguache
District: Marshall Pass District

Land Status

Land ownership: National Forest
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: Surface

Ownership

Owner Name: Homestake Mining Co.
Years: 1955 -

Production

Year: 1956
Mined: 17.710 mt

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1955
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: Sawatch Range, San Juan Volcanic Field

Type: L
Structure: small faults related to Chester Fault
Description: Chester Fault

Alterations

Not available

Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Mesoproterozoic

Name: Schist
Role: Host
Age Type: Host Rock
Age Young: Paleoproterozoic

Analytical Data

Analytical Data: RADIATION 20 MR/HR, BACKGROUND 0.07 MR/HR
Analytical Data: TWO SAMPLES ASSAYED 21.4 AND 30.0+% EQUIV. U308

Materials

Ore: Uranophane
Ore: Galena
Ore: Pitchblende

Comments

Comment (Location): ON UNNAMED TRIBUTARY OF HARRY CREEK 2.1 MILES NW OF MARSHALL PASS ; INFO FROM LAND.ST :1976

Comment (Production): PRODUCTION IN 1956 AMOUNTED TO 18 TONS ORE AT GRADE OF 1.06% U308 AND 0.06% V205, YIELDING 380 LB U308 AND 22 LB V205

Comment (Deposit): URANIUM MINERALIZATION FOUND IN PRECAMBRIAN SCHIST INTRUDED BY PEGMATITIC GRANITE ALONG LOCAL BEDDING AND FOLIATION TREND OF APPROX. N40E. IF THIS SITE IS SIMILAR TO LOOKOUT NO. 22 PROSPECT TO SOUTH, URANIUM COULD BE LOCALIZED BY SMALL CHESTER FAULT OFFSHOOTS. HIGHER GRADE ORE WAS PRODUCED FROM REGOLITH OR COLLUVIUM OVERLYING BEDROCK.

Comment (Deposit): REMAINDER OF MARSHALL PASS BLOCK OF CLAIMS (1 THRU 58) LIE IN SE SEC. 11, ALL SEC. 14, E2 SEC. 15, E2 SEC. 22, W2 AND NE SEC. 23, NE SEC. 27, T48N, R6E ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Workings): ONE PIT 6 FT DEEP

References

Reference (Deposit): WRIGHT, R.J., AND EVERHART, D.L., 1960, URANIUM--MARSHALL PASS DISTRICT, IN DEL RIO, S.M., MINERAL RESOURCES OF COLORADO--FIRST SEQUEL: COLORADO STATE MINERAL RESOURCES BOARD, P. 357-359.

Reference (Deposit): OLSON, J.C., 1977, PRELIMINARY GEOLOGIC MAP OF PART OF THE PAHLONE PEAK QUADRANGLE, GUNNISON, SAGUACHE, AND CHAFFEE COUNTIES, COLORADO: USGS OPEN-FILE REPT. 77-325.

Reference (Deposit): GROSS, E.B., 1965, A UNIQUE OCCURRENCE OF URANIUM MINERALS, MARSHALL PASS, SAGUACHE COUNTY, COLORADO: AM. MINERALOGIST, V. 50, NOS. 7-8, P. 909-923.

Reference (Deposit): RANSPOT, H.W., 1958, GEOLOGY AND URANIUM DEPOSITS OF THE INDIAN CREEK AREA, GUNNISON AND SAGUACHE COUNTIES, COLORADO: UNIV. COLORADO M.S. THESIS

Reference (Deposit): NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 392

Colorado Mining Photos

Check out this collection of Colorado's best historic mining photos: Incredible Photos of Colorado Mining Scenes.