Mine detail: Centennial Cone Prospect

Previously called 'K-L Green Ranch'

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Location

Lat / long:

39.75416, -105.35752

Resource(B)

Primary:	Beryllium
Tertiary:	Feldspar, Mica, Quartz, REE
Ore:	Beryl, Microcline, Monazite, Muscovite, Quartz

Production

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

Geology

Host rock:	Idaho Springs Formation-Microcline-Quartz-Plagioclase-Biotite Gneiss Unit
Host type:	Gneiss
Associated rock:	Granitic Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Junction Ranch Fault System, Unnamed Anticline
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010189
DEP	10013731
Reference	{Deposit:: SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. 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. 85-86}{Deposit:: WALDSCHMIDT, W.A., AND ADAMS, J.W., 1942, THE BERYL-MONAZITE PEGMATITE DIKE OF CENTENNIAL CONE, COLORADO: COLORADO SCHOOL OF MINES QUART., V. 37, NO. 3, P. 29-38}{Deposit:: USBM MIN. EXAM. FILE, REPT. OF 4/23/59 (FROM ORIGINAL CRIB RECORD)}{Production:: ORIGINAL CRIB RECORD (PROBABLY USBM REFERENCE)}
Reporter	Schwochow, Stephen D.