Spring Group

The Spring Group is a uranium mine located in Larimer county, Colorado at an elevation of 8,120 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: Spring Group
Secondary: Revis Mine
Secondary: Claims: Spring No. 1
Secondary: Spring No. 2
Secondary: Lady Cora Hellen

Commodity

Primary: Uranium
Tertiary: Silver
Tertiary: Gold
Tertiary: Lead

Location

State: Colorado
County: Larimer
District: Spencer Heights-Poudre Falls Area

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/Underground

Ownership

Owner Name: G. L. Lindsey
Home Office: Bellevue
Years: 1960 -

Owner Name: Revis Brothers
Home Office: Bellevue
Years: 1960 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
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

Not available

Structure

Type: R
Description: Front Range Uplift, Sherman Batholith, Rawah Batholith

Type: L
Description: Ne-Trending Faults And Shear Zones

Alterations

Alteration Type: L
Alteration Text: Sericitization

Rocks

Name: Pegmatite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Pegmatite
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic

Analytical Data

Analytical Data: USGS/USBM SAMPLES CONTAINED TRACE AU, TRACE PB, 0.1 OZ/TON AG, 0.011% U3O8

Materials

Ore: Galena
Ore: Pitchblende
Gangue: Limonite

Comments

Comment (Location): ACROSS CACHE LA POUDRE RIVER FROM SPENCER HEIGHTS. ELEV AND LAT-LONG GIVEN ARE FOR SHAFT ON SPRING NO. 1 CLAIM. ; INFO FROM LAND.ST :(1980)

Comment (Production): APPROX 40 ST ORE-GRADE MATERIAL STOCKPILED.

Comment (Development): DISCOVERY OF URANIUM HERE WAS PROMPTED BY ABNORMALLY HIGH RADIATION FOUND IN SPRING WATER.

Comment (Workings): 81-FT-DEEP SHAFT, WITH SOUTH-BEARING LEVEL AT 30 FT; BULLDOZER CUTS

Comment (Deposit): DEPOSIT FOUND AT CONTACT OF GRANITE OR GRANITIC GNEISS AND BIOTITE SCHIST. MINERALIZATION FOUND ON FRACTURE FACES ASSOCIATED WITH SHEAR ZONE TRENDING APPROX N 70 E.

References

Reference (Deposit): NELSON-MOORE, J.L., AND OTHERS, 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 210.

Reference (Deposit): PEARSON, R.C., AND OTHERS, 1981, MINERAL RESOURCES OF THE COMANCHE-BIG SOUTH, NEOTA-FLAT TOP, AND NEVER SUMMER WILDERNESS STUDY AREAS, NORTH-CENTRAL COLORADO: USGS OFR 81-578, P. 25-27

Reference (Deposit): COLORADO DIV. MINES INF. REPT.

Colorado Mining Photos

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