Mine detail: Last Chance Mine

Previously called 'Last Chance Pit'

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Location

Lat / long:

38.52529, -105.49391

Resource(M)

Primary:	Uranium
Ore:	Coffinite, Uraninite
Gangue:	Hematite, Limonite
Orebody form:	TABULAR, PODS

Production

Operation type:	Surface-Underground
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Tallahassee Creek Conglomerate
Host type:	Tuff,Volcanic Breccia (Agglomerate)
Associated rock:	Wall Mountain Tuff Was Probable Principal Uranium Source
Associated type:	Rhyolite
Structure:	Thirty Nine Mile Volcanic Field, Currant Creek Basin, Echo Park Graben, Paleo Valleys
Tectonic:	Central Cordillera (Southern Rocky Mountains)
Alteration processes:	Oxidation; Alteration Of Feldspar To Clay

References

MRDS	D009326
DEP	10107980
Reference	{Deposit:: NELSON-MOORE, J.L., COLLINS, D.B. AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULLETIN 40, P. 149.}{Deposit:: WOBUS, R.A., EPIS, R.C. AND SCOTT, G.R., 1979, GEOLOGIC MAP OF THE COVER MOUNTAIN QUADRANGLE, FREMONT, PARK, AND TELLER COUNTIES, COLORADO: USGS MAP I-1179, 1:62,500.}{Deposit:: DICKINSON, K.A., 1981, GEOLOGIC CONTROLS OF URANIUM MINERALIZATION IN THE TALLAHASSEE CREEK URANIUM DISTRICT, FREMONT COUNTY, COLORADO: THE MOUNTAIN GEOLOGIST, V. 18, NO. 4, P. 88-94.}{Deposit:: BABCOCK, J.A., 1980, TALLAHASSEE CREEK URANIUM DEPOSITS: DENVER REGIONAL EXPLORATION GEOLOGISTS SOCIETY GUIDEBOOK, P. 15-31}{Production:: NELSON-MOORE AND OTHERS, 1978}
Reporter	Collins, Donna B., Keller, John W.