Mine detail: Silver Glen Ranch Pegmatite

Previously called ''

<< Back to the map

Location

Lat / long:

39.66666, -105.30308

Resource(B)

Primary:	Mica, Feldspar
Secondary:	Beryllium, Niobium (Columbium), Tantalum
Tertiary:	REE, Thorium
Ore:	Bertrandite, Beryl, Cleavelandite, Columbite, Microcline, Microlite, Monazite, Thorite
Gangue:	Garnet, Topaz
Orebody form:	TABULAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1945
Last production ended:	1956

Geology

Host rock:	Idaho Springs Formation---Interlayered Hornblende Gneiss, Calc-Silicate Gneiss, And Amphibolite
Host type:	Gneiss
Associated rock:	Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Floyd Hill Fault Zone, Unnamed Overturned Anticline
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010196
DEP	10013737
Reference	{Deposit:: BOOS, M.F., 1954, GENESIS OF PRECAMBRIAN PEGMATITES IN THE DENVER MOUNTAIN PARKS AREA, COLORADO: GSA BULL., V. 65, P. 115-142}{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, REPT. OF 6/1/59 (FROM ORIGINAL CRIB RECORD)}{Production:: ORIGINAL CRIB RECORD (PROBABLY USBM REFERENCE)}
Reporter	Schwochow, Stephen D.