Mine detail: Ajax Mica Mine

Previously called 'Floyd Hill Mica Mine'

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Location

Lat / long:

39.74916, -105.44087

Resource(B)

Primary:	Mica
Tertiary:	Beryllium
Ore:	Beryl, Muscovite
Gangue:	Albite, Biotite, Quartz, Sericite, Tourmaline
Orebody form:	LENTICULAR, POD
Discovery year:	1875

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1895
Last production ended:	1944

Geology

Host rock:	Idaho Springs Formation---Biotite Gneiss
Host type:	Schist,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	D010225
DEP	10013761
Reference	{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 27-29}{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:: BOOS, M.F., 1954, GENESIS OF PRECAMBRIAN PEGMATITES IN THE DENVER MOUNTAIN PARKS AREA, COLORADO: GSA BULL., V. 65, P. 115-142}
Reporter	Schwochow, Stephen D.