Mine detail: Brandt Beryl-Topaz Prospect

Previously called 'Beaver Brook Pegmatite'

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Location

Lat / long:

39.70943, -105.39976

Resource(M)

Primary:	Beryllium
Ore:	Beryl
Gangue:	Topaz
Orebody form:	TABULAR

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

Host rock:	Idaho Springs Formation---Feldspar-Rich Gneiss Interlayered With Hornblende Gneiss
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	D010226
DEP	10013762
Reference	{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 30}{Deposit:: SHERIDAN, D.M., AND MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337}
Reporter	Schwochow, Stephen D.