Mine detail: Robinson Gulch Prospect

Previously called ''

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Location

Lat / long:

39.7886, -105.34864

Resource(B)

Primary:	Beryllium, Mica, Feldspar
Ore:	Chrysoberyl, Muscovite
Gangue:	Quartz

Production

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

Geology

Host rock:	Idaho Springs Formation---Interlayered Amphibolite And Biotite-Plagioclase-Quartz Gneiss;Pegmatite
Host type:	Gneiss,Amphibolite
Associated rock:	Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Junction Ranch Fault Zone
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010187
DEP	10094626
Reference	{Deposit:: SHERIDAN, D,M,M AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCLUDES GEOLOGIC MAP OF RALSTON BUTTES QUAD).}{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 85.}{Deposit:: USGS COMMODITY FILE: GRP III, REEL 32, 1944; GR III, REEL 40, 1943; GR II, REEL 12, DOC. 2701, 1946 (FROM ORIGINAL CRIB RECORD)}
Reporter	Schwochow, Stephen D.