Tall Timber Group

The Tall Timber Group is a mica, beryllium, and feldspar mine located in Jefferson county, Colorado at an elevation of 7,201 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: Tall Timber Group  

State:  Colorado

County:  Jefferson

Elevation: 7,201 Feet (2,195 Meters)

Commodity: Mica, Beryllium, Feldspar

Lat, Long: 39.64583, -105.27194

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 Tall Timber Group

Tall Timber Group MRDS details

Site Name

Primary: Tall Timber Group
Secondary: Tall Timber Nos. 1
Secondary: And 3


Commodity

Primary: Mica
Primary: Beryllium
Primary: Feldspar
Tertiary: Tantalum
Tertiary: Niobium (Columbium)


Location

State: Colorado
County: Jefferson
District: Clear Creek Pegmatite Province


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
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, Denver Basin

Type: L
Description: Floyd Hill Fault Zone


Alterations

Not available


Rocks

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

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

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


Analytical Data

Not available


Materials

Ore: Muscovite
Ore: Columbite
Ore: Tantalite
Ore: Beryl
Gangue: Tourmaline
Gangue: Garnet


Comments

Comment (Development): OPERATED INTERMITTENTLY FOR FELDSPAR, SCRAP MICA, AND BERYL

Comment (Location): ALONG UNNAMED TRIBUTARIES OF BEAR CREEK 3 TO 3.5 MILES NE OF EVERGREEN. ELEV AND LAT-LONG GIVEN ARE FOR APPROX CENTER NW SEC. 06 ; INFO FROM LAND.ST :(1975)

Comment (Production): ESTIMATED PRODUCTION FROM TALL TIMBERS NOS. 1 AND 3; SMALL PRODUCTION LISTED FOR NO. 3; YEARS UNKNOWN

Comment (Deposit): ZONED PEGMATITES LIE IN FELDSPAR-RICH GNEISS

Comment (Workings): TWO LARGE OPEN CUTS, SEVERAL SMALL OPEN CUTS, ONE TUNNEL


References

Reference (Deposit): SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.

Reference (Deposit): MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29

Reference (Deposit): USBM MIN. EXAM. FILE, REPTS. OF 4/6/59 AND 2/9/59 (FROM ORIGINAL CRIB RECORD)

Reference (Production): ORIGINAL CRIB RECORDS (PROBABLY USBM REFERENCE)


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.