Mine detail: Tall Timber Group

Previously called 'Tall Timber Nos. 1And 3'

<< Back to the map

Location

Lat / long:

39.64582, -105.27252

Resource(B)

Primary:	Mica, Beryllium, Feldspar
Tertiary:	Tantalum, Niobium (Columbium)
Ore:	Beryl, Columbite, Muscovite, Tantalite
Gangue:	Garnet, Tourmaline

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Idaho Springs Formation---Feldspar-Rich Gneiss;Idaho Springs Formation---Amphibolite
Host type:	Gneiss
Associated rock:	Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Floyd Hill Fault Zone
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010183
DEP	10101837
Reference	{Deposit:: SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29}{Deposit:: USBM MIN. EXAM. FILE, REPTS. OF 4/6/59 AND 2/9/59 (FROM ORIGINAL CRIB RECORD)}{Production:: ORIGINAL CRIB RECORDS (PROBABLY USBM REFERENCE)}
Reporter	Schwochow, Stephen D., Spanski, Gregory T.