Bell Group

The Bell Group is a gold and silver mine located in Boulder county, Colorado at an elevation of 6,401 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

Name: Bell Group  

State:  Colorado

County:  Boulder

Elevation: 6,401 Feet (1,951 Meters)

Commodity: Gold, Silver

Lat, Long: 40.0314, -105.33510

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.


Satelite image of the Bell Group

Bell Group MRDS details

Site Name

Primary: Bell Group


Commodity

Primary: Gold
Primary: Silver
Tertiary: Uranium


Location

State: Colorado
County: Boulder
District: Gold Hill 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

Not available


Ownership

Not available


Production

Not available


Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
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, Boulder Creek Batholith

Type: L
Description: Poorman Fault Zone, Maxwell Fault Zone (Breccia Reef)


Alterations

Alteration Type: L
Alteration Text: Silicification


Rocks

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

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

Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Neoproterozoic

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


Analytical Data

Analytical Data: SAMPLES RANGE FROM 0.0006 TO 0.041% U3O8


Materials

Not available


Comments

Comment (Location): WITHIN 0.5 MILE NE OF POORMAN HILL ; INFO FROM LAND.ST :(1976)

Comment (Geology): VEINS OUT FRACTURES IN THE POORMAN FAULT ZONE WHICH IS 20 TO 60 FT WIDE

Comment (Deposit): ALTHOUGH BELL GROUP AND ADJACENT POORMAN GROUP ARE ISOLATED SE OF MAIN PART OF DISTRICT, PRODUCTIVE AU-AG TELLURIDE VEINS WERE FORMED IN STRUCTURALLY FAVORABLE FISSURES ON SW SIDE OF INTERSECTION OF POORMAN REEF (TRENDING GENERALLY N 80 TO 85 W) AND PROMINENT LARAMIDE MAXWELL REEF (TRENDING N 25 W).


References

Reference (Deposit): LOVERING, T.S., AND GODDARD, E.N., 1950, GEOLOGY AND ORE DEPOSITS OF THE FRONT RANGE, COLORADO: USGS PROF. PAPER 223, P. 234-246

Reference (Deposit): COLTON, R.B., 1978, GEOLOGIC MAP OF THE BOULDER-FORT COLLINS-GREELEY AREA, COLORADO: USGS MAP I-855-G

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. 81


Colorado Mining Photos

Placer mines at Cripple Creek, Colorado ca. 1892

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