Mine detail: East Shaffer Hill Pegmatite

Previously called ''

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Location

Lat / long:

39.71249, -105.38252

Resource(B)

Primary:	Feldspar
Tertiary:	Tantalum, Copper, REE
Ore:	Cleavelandite, Malachite, Microcline, Microlite
Gangue:	Garnet, Magnetite, Monazite, Quartz
Orebody form:	TABULAR
Discovery year:	1938

Production

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

Geology

Host rock:	Idaho Springs Formation---Hornblende Gneiss And 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	D010193
DEP	10013735
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 MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITES DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28.}
Reporter	Schwochow, Stephen D.