Mine detail: Big Bertha Mine

Previously called ''

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Location

Lat / long:

39.33944, -105.21836

Resource(B)

Primary:	Quartz, Feldspar
Secondary:	Thorium, REE
Ore:	Allanite, Xenotime
Gangue:	Fluorite, Gadolinite, Monazite, Thorite
Orebody form:	IRREGULAR

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1947
Last production ended:	1953

Geology

Host rock:	Pegmatite;Pikes Peak Granite
Host type:	Pegmatite
Associated rock:	Pegmatite;Pikes Peak Granite
Associated type:	Pegmatite,Granite
Structure:	Front Range Uplift, Pikes Peak Batholith, Kennedy Gulch Fault Zone
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Minor Replacement Of Fluorite By Xenotime

References

MRDS	D010178
DEP	10101836
Reference	{Deposit:: SIMMONS, W.B., AND HEINRICH, E.W., 1980, RARE-EARTH PEGMATITES OF THE SOUTH PLATTE DISTRICT, COLORADO: CGS RESOURCE SER. 11, 131 P.}{Deposit:: PETERSON, W.L., 1964, GEOLOGY OF THE PLATTE CANYON QUADRANGLE, COLORADO: USGS BULL. 1181-C, 23 P., 1 PL.}{Deposit:: COLORADO DIV. MINES ANNUAL OPERATORS REPTS.}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 27.}
Reporter	Schwochow, Stephen D.